WO2018159561A1 - Reverse osmosis treatment device and reverse osmosis treatment method - Google Patents

Abstract

The present invention provides a reverse osmosis treatment device and a reverse osmosis treatment method with which it is possible to continuously perform a reverse osmosis treatment even during washing of piping accompanying the device. A reverse osmosis treatment device (1) is provided with a membrane unit (100) formed by disposing one or a plurality of reverse osmosis membrane modules. A part of a supply channel for supplying treatment water and/or a discharge channel for discharging concentrated water is configured from a plurality of piping (110, 210) disposed in parallel, each of which has an inlet valve (V11, V21) capable of closing an inlet and an outlet valve (V12, V22) capable of closing an outlet, and in which chemical washing piping (120, 220) capable of supplying chemical washing water is connected to an intermediate part. A reverse osmosis treatment method comprises subjecting treatment water to a reverse osmosis treatment using some of the piping, washing the remaining piping, and continuing the reverse osmosis treatment while alternating the piping used in the reverse osmosis treatment and the piping to be washed.

Description

Reverse osmosis treatment apparatus and reverse osmosis treatment method

The present invention relates to a reverse osmosis treatment apparatus for desalting brine such as seawater by reverse osmosis and a reverse osmosis treatment method using the same.

逆 Reverse osmosis treatment equipment that desalinates brine by reverse osmosis is used in various fields such as desalination of seawater, reuse of wastewater, and production of pure water. A typical example of the reverse osmosis treatment apparatus includes a cylindrical reverse osmosis membrane module. This type of reverse osmosis membrane module includes a plurality of reverse osmosis membrane elements that support a reverse osmosis membrane inside a cylindrical pressure vessel.

The reverse osmosis membrane element provided in the cylindrical reverse osmosis membrane module has a structure in which a reverse osmosis membrane is wound in a spiral shape around a water collection pipe. A plurality of reverse osmosis membrane elements are usually housed in a pressure vessel and used in a state of being arranged in series. Such reverse osmosis membrane modules constitute a bank by being connected in parallel through one or a plurality of pipes. Furthermore, a bank of reverse osmosis membrane modules forms a membrane unit by being connected in series through one or a plurality of pipes. Usually, reverse osmosis treatment equipment is provided with a plurality of membrane units.

The reverse osmosis membrane module performs reverse osmosis treatment of the water to be treated flowing into the pressure vessel by a cross flow filtration method, and separates it into permeated water in which ions are reduced and concentrated water in which ions are concentrated. When the water to be treated flows from one end of the pressure vessel, the concentrated water concentrated on the primary side of the reverse osmosis membrane by reverse osmosis is discharged from the other end of the pressure vessel. On the other hand, the permeated water that has permeated the secondary side of the reverse osmosis membrane is collected inside the water collection pipe and taken out of the reverse osmosis membrane module.

The reverse osmosis membrane provided in the reverse osmosis membrane module may be clogged by organic substances contained in the water to be treated, inorganic substances deposited as scales, and the like. If the pores of the reverse osmosis membrane are clogged, the amount of water produced and the removal rate will decrease, and if it is severe, breakthrough will occur, so periodic cleaning and replacement are necessary. In particular, in the case of reverse osmosis treatment of seawater, sewage treated water and other treated water in which microorganisms are likely to propagate, biofouling becomes a major problem, making it difficult to continue stable reverse osmosis treatment. Therefore, when reverse osmosis treatment is performed on water to be treated in which microorganisms are likely to propagate, measures for preventing microbial contamination are essential.

As a measure for preventing biofouling, pretreatment using a chemical having a bactericidal action is generally performed. Chemicals such as sodium hypochlorite are added to the water to be treated upstream of the reverse osmosis membrane, and such pretreatment prevents the growth of microorganisms in the piping and reverse osmosis membrane module through which the water to be treated flows. ing. However, a general reverse osmosis membrane is made of polyamide or the like and deteriorates by reacting with a chemical containing free chlorine. Therefore, normally, after adding chemicals such as sodium hypochlorite to the water to be treated, a reducing agent such as sodium bisulfite is added downstream, and neutralized before the chemical reaches the reverse osmosis membrane. Yes.

As the reverse osmosis treatment apparatus, there is an integrated type in which a seawater treatment system for reverse osmosis treatment of seawater and a wastewater treatment system for reverse osmosis treatment of wastewater such as sewage treated water are available. In the integrated reverse osmosis treatment, seawater is diluted with concentrated water separated by reverse osmosis treatment of wastewater, and the seawater that has been diluted to lower the osmotic pressure is subjected to reverse osmosis treatment. For example, Patent Document 1 describes a technique for effectively utilizing a bactericide and a neutralizing agent to be injected and to suppress troubles due to biofilm formation in integrated reverse osmosis treatment. In patent document 1, the injection | pouring position which inject | pours a chemical | medical agent and a neutralizing agent into to-be-processed water, the timing to inject | pour, etc. are adjusted, and the improvement of a washing | cleaning effect and a bactericidal effect, the fall of the chemical usage-amount etc.

JP2015-123430A

Reverse osmosis membrane fouling occurs not only when the microbial membrane grows on the membrane surface, but also when the microbial membrane grows by adhering to a pipe upstream of the reverse osmosis membrane and flows into the reverse osmosis membrane module from the pipe Sometimes. Usually, the reverse osmosis membrane is quickly replaced when the deterioration has progressed, but the piping associated with the reverse osmosis treatment apparatus is often continued without being replaced. For this reason, pipes are often a source of contamination of reverse osmosis membranes, and there is a current situation that pipes are regularly cleaned to prevent fouling due to inflow from the pipes.

In general, when cleaning the pipes attached to the reverse osmosis treatment equipment, stop the operation of the equipment, separate the reverse osmosis membrane that may be deteriorated by chemicals, and then add chemicals such as hypochlorous acid Wash water. However, in such a method, there is a problem that water cannot be formed by reverse osmosis treatment while washing the piping, the operating rate is reduced, and the amount of produced water is reduced. As described in Patent Document 1, even if the injection position and timing for injecting a chemical or a neutralizing agent are adjusted, the method of performing chemical washing while supplying water to be treated sufficiently reduces the contamination of the piping. Is difficult.

Therefore, an object of the present invention is to provide a reverse osmosis treatment apparatus and a reverse osmosis treatment method capable of continuing the reverse osmosis treatment even when the pipe attached to the apparatus is washed.

In order to solve the above-mentioned problems, a reverse osmosis treatment apparatus according to the present invention includes a membrane unit in which one or a plurality of reverse osmosis membrane modules for performing reverse osmosis treatment of treated water, and the reverse treatment of the treated water. At least one part of the supply path for supplying the osmosis membrane module and the discharge path for discharging the concentrated water separated by the reverse osmosis treatment from the reverse osmosis membrane module are arranged in parallel. Each of the pipes has an inlet valve capable of closing an inlet of the pipe and an outlet valve capable of closing an outlet of the pipe, and an intermediate between the inlet and the outlet. A chemical washing pipe capable of supplying chemical washing water for washing the pipe is connected to the section.

In addition, the reverse osmosis treatment method according to the present invention includes a membrane unit in which one or a plurality of reverse osmosis membrane modules for performing reverse osmosis treatment on treated water is provided, and supplies the treated water to the reverse osmosis membrane module. And at least one part of the supply path for discharging the concentrated water separated by the reverse osmosis treatment from the reverse osmosis membrane module is configured by a plurality of pipes arranged in parallel. In the reverse osmosis treatment apparatus, each of the pipes is connected to a chemical washing pipe capable of supplying chemical washing water for washing the pipe at an intermediate portion between the inlet and the outlet. Among them, reverse osmosis treatment of the water to be treated using a part of the piping, and washing the inside of the pipe by passing the chemical washing water through the remaining piping while reverse osmosis treatment of the water to be treated And before using for reverse osmosis treatment Characterized in that continuing the reverse osmosis process while interchanging the said pipe for cleaning the pipe.

According to the present invention, it is possible to provide a reverse osmosis treatment apparatus and a reverse osmosis treatment method capable of continuing the reverse osmosis treatment even when the pipes attached to the device are washed.

It is a figure which shows the structural example of the reverse osmosis processing apparatus which concerns on one Embodiment of this invention. It is a figure which shows the structural example of the reverse osmosis processing apparatus which concerns on one Embodiment of this invention. It is sectional drawing which shows an example of the structure of a reverse osmosis membrane module. It is a perspective view which shows an example of the structure of a reverse osmosis membrane element. It is a figure which shows an example of a structure of a chemical washing apparatus. It is a figure which shows an example of a structure of a chemical washing apparatus. It is a figure which shows switching operation of the multiplexed piping. It is a figure which shows switching operation of the multiplexed piping. It is a figure which shows the position which applies the multiplexed piping. It is a figure which shows the position which applies the multiplexed piping. It is a figure which shows the position which applies the multiplexed piping. It is a figure which shows the example of a connection of the multiplexed piping. It is a figure which shows the example of a connection of the multiplexed piping. It is a figure which shows the example of a connection of the multiplexed piping. It is a figure which shows the example of a connection of the multiplexed piping. It is a figure which shows the structural example of the reverse osmosis processing apparatus which concerns on a modification.

Hereinafter, a reverse osmosis treatment apparatus and a reverse osmosis treatment method according to an embodiment of the present invention will be described. In addition, about the structure which is common in each following figure, the same code | symbol is attached | subjected and the overlapping description is abbreviate | omitted.

1A and 1B are diagrams illustrating a configuration example of a reverse osmosis processing device according to an embodiment of the present invention.
As shown in FIGS. 1A and 1B, the reverse osmosis treatment apparatus 1 according to this embodiment includes a membrane unit 100 that performs reverse osmosis treatment on water to be treated. The membrane unit 100 includes one or a plurality of reverse osmosis membrane modules. Specifically, the membrane unit 100 is configured by connecting one or more banks of reverse osmosis membrane modules in series via a pipe. A bank is a series in which one or a plurality of reverse osmosis membrane modules are connected in parallel via a pipe.

The reverse osmosis treatment apparatus 1 desalinates the water to be treated by reverse osmosis to produce desalted water with reduced concentrations of ions and salts. As the water to be treated, for example, salt water such as seawater, associated water, brackish water, fossil water, groundwater, surface water is supplied to the apparatus. Specifically, the reverse osmosis treatment device 1 is used by being connected to various pumps, various pretreatment devices and the like necessary for reverse osmosis treatment or pretreatment of water to be treated. The reverse osmosis treatment apparatus 1 can be used for applications such as seawater desalination, wastewater reuse, pure water production, and the like.

Here, the structure of the reverse osmosis membrane module constituting the membrane unit 100 will be described.

FIG. 2 is a cross-sectional view showing an example of the structure of the reverse osmosis membrane module.
As shown in FIG. 2, the reverse osmosis membrane module M includes a pressure vessel 5 and a reverse osmosis membrane element 6. The pressure vessel 5 has a substantially cylindrical shape, and has an introduction port 5a at one end and a lead-out port 5b at the other end. One or more reverse osmosis membrane elements 6 are accommodated in the pressure vessel 5. The reverse osmosis membrane element 6 includes a reverse osmosis membrane 7 and is arranged in series inside the pressure vessel 5. In FIG. 2, a total of five reverse osmosis membrane elements 6 are arranged. The number of reverse osmosis membrane elements 6 is appropriately determined according to the specifications of the reverse osmosis membrane module, the concentration rate of the reverse osmosis treatment, and the like. The number of

FIG. 3 is a perspective view showing an example of the structure of the reverse osmosis membrane element.
As shown in FIG. 3, the reverse osmosis membrane element 6 is configured by arranging a membrane laminate 6 a on which a reverse osmosis membrane 7 is stacked around a water collection pipe 8. The membrane laminate 6 a is formed of a plurality of bag-like reverse osmosis membranes 7 and mesh-like spacers 9 that are radially joined to the peripheral surface of the water collecting pipe 8 and spirally wound around the water collecting pipe 8. Is formed. The reverse osmosis membrane 7 is joined to the water collection pipe 8 so that the inside of the bag body communicates with the through hole 8 a of the water collection pipe 8. The outer shape of the reverse osmosis membrane 7 is maintained by interposing a spacer 9 between the inside of the bag and between the reverse osmosis membranes 7.

As shown in FIG. 2, the reverse osmosis membrane element 6 is accommodated in the pressure vessel 5 such that the water collection pipe 8 is arranged in series with each other in the direction along the longitudinal direction of the pressure vessel 5. The water collection pipes 8 of the reverse osmosis membrane element 6 are connected to each other to form a single open pipe, and the end of the water collection pipe 8 is the end of the pressure vessel 5 provided with the outlet port 5b. It is pulled out from the outside.

In the reverse osmosis membrane module M shown in FIG. 3, the water to be treated that has been pressurized to the osmotic pressure or higher is introduced into the pressure vessel 5 through the introduction port 5a. And while the to-be-processed water flows through the inside of the pressure vessel 5 along a longitudinal direction, a reverse osmosis process is performed by the reverse osmosis membrane 7 by a crossflow filtration system. Thereafter, the concentrated water concentrated on the primary side of the reverse osmosis membrane 7 by the reverse osmosis treatment is discharged from the pressure vessel 5 through the outlet port 5b. On the other hand, the permeated water that has permeated the secondary side of the reverse osmosis membrane 7 is collected in the water collection pipe 8 and discharged from the end.

The membrane unit 100 shown in FIGS. 1A and 1B is configured by arranging one or a plurality of banks in which one or a plurality of such reverse osmosis membrane modules are arranged in parallel. A bank is usually composed of reverse osmosis membrane modules having the same specifications, and is connected in parallel to each other via a pipe. When the membrane unit 100 includes a plurality of reverse osmosis membrane modules, reverse osmosis is achieved by arranging one or a plurality of banks in which reverse osmosis membrane modules having the same specifications are connected in parallel by piping. A sequence for processing is configured.

As shown in FIGS. 1A and 1B, the membrane unit 100 includes a supply path for supplying the water to be treated to the reverse osmosis membrane module of the membrane unit 100, and the permeated water separated by the reverse osmosis treatment. A recovery path for recovering from the reverse osmosis membrane module and a discharge path for discharging the concentrated water separated by the reverse osmosis treatment from the reverse osmosis membrane module of the membrane unit 100 are used in a connected state.

The treated water supply path allows the treated water to flow from the supply source of the treated water outside the system toward the primary inlet (introduction port 5a) of the reverse osmosis membrane module included in the membrane unit 100. A simple flow path is formed. In addition, the permeate recovery path is a channel through which permeate can flow from the secondary side outlet (the end of the water collection pipe 8) of the reverse osmosis membrane module included in the membrane unit 100 toward the outside of the system. Forming. Further, the concentrated water discharge path forms a flow path through which the concentrated water can flow from the outlet (outlet port 5b) on the primary side of the reverse osmosis membrane module included in the membrane unit 100 toward the outside of the membrane unit 100. is doing.

The reverse osmosis treatment apparatus 1 according to the present embodiment is separated by a supply path for supplying water to be treated to the reverse osmosis membrane module of the membrane unit 100 and reverse osmosis treatment as shown in FIGS. 1A and 1B. Among the discharge paths for discharging the concentrated water from the reverse osmosis membrane module of the membrane unit 100, at least one part is constituted by a plurality of pipes (110, 210) arranged in parallel. .

That is, in the reverse osmosis treatment apparatus 1, at least a part of at least one of the supply path and the discharge path communicating with the primary side of the reverse osmosis membrane (7) inside the pressure vessel (5) is parallel. It is comprised by the piping (110,210) multiplexed in the shape. FIG. 1A shows an example in which multiplexed pipes (110, 210) are arranged in a supply path of water to be treated. Moreover, FIG. 1B has shown the example which has arrange | positioned the multiplexed piping (110,210) in the discharge path of concentrated water.

In the reverse osmosis treatment apparatus 1, the pipes communicating with the primary side of the reverse osmosis membrane (7) are multiplexed, and the redundant flow path series is provided, so that the multiplexed pipes (110, 210) are provided. Among them, some piping can be washed and the reverse osmosis treatment can be continued with the remaining piping. In FIG. 1A and FIG. 1B, an example in which the multiplexed pipes are composed of two pipes of the first pipe 110 and the second pipe 210 is shown, but the number of multiplexed pipes is two or more. It is possible to use an appropriate number.

As shown in FIGS. 1A and 1B, each of the multiplexed pipes (110, 210) includes an inlet valve (V11, V21) capable of closing the inlet of the pipe itself and an outlet capable of closing the outlet of the pipe itself. And valves (V12, V22). The first pipe 110 has a first inlet valve V11 and a first outlet valve V12. The second pipe 210 has a second inlet valve V21 and a second outlet valve V22. The multiplexed individual pipes are configured such that the flow of water to be treated is blocked by closing the inlets and outlets of the pipes with valves. By closing with the valve, the inside of the pipe itself is isolated from the water to be treated supplied for the reverse osmosis treatment.

In addition, each of the multiplexed pipes (110, 210) has a chemical washing pipe (120, 210) through which chemical washing water for washing the pipe itself can flow in an intermediate portion between the inlet and the outlet of the pipe. 220, 140, 240) are connected. In FIG. 1A and FIG. 1B, as the chemical washing pipes (120, 220, 140, 240), the first chemical washing pipe 120 for the first pipe, the second chemical washing pipe 140 for the first pipe, A total of four pipes, a first chemical washing pipe 220 for the second pipe and a second chemical washing pipe 240 for the second pipe, are provided. The first chemical wash pipe 120 (V13, V14) is provided in the first chemical wash pipe 120 for the first pipe and the first chemical wash pipe 220 for the second pipe, respectively. The second chemical wash pipe 140 for the first pipe and the second chemical wash pipe 240 for the second pipe are provided with second chemical wash pipe valves (V23, V24), respectively. .

1A and 1B, the first chemical wash pipe 120 for the first pipe and the first chemical wash pipe 220 for the second pipe are pipes (110, 210) having one end multiplexed. Each outlet side (downstream side of the water to be treated) is connected upstream of the outlet valves (V12, V22). On the other hand, the other end is connected to a common chemical washing apparatus U. In addition, the second chemical wash pipe 140 for the first pipe and the second chemical wash pipe 240 for the second pipe have one end on each inlet side of the multiplexed pipes (110, 210) ( The upstream side of the water to be treated is connected downstream of the inlet valves (V11, V21). On the other hand, the other end is connected to a common chemical washing apparatus U.

4A and 4B are diagrams showing an example of the configuration of the chemical washing apparatus.
As shown in FIGS. 4A and 4B, the chemical washing apparatus U passes the chemical washing water tank 310 for temporarily storing the chemical washing water and the pipes (110, 210) multiplexed with the chemical washing water. A chemical washing pump 320 for watering and a filter 330 for filtering the chemical washing water to remove contaminated substances after washing can be configured.

The chemical washing apparatus U includes a chemical washing water tank 310, a chemical washing pump 320, a filter 330, and the like in series via a pipe through which chemical washing water can flow, and one end is a first chemical for the first pipe. The other pipes are connected to the washing pipe 120 and the first medicine washing pipe 220 for the second pipe, respectively, and the other ends are the second medicine washing pipe 140 for the first pipe and the second medicine washing pipe for the second pipe. 240 respectively. That is, a circulation path through which the chemical wash water can be circulated is formed between the chemical washing apparatus U and the multiplexed pipes (110, 210), and the first chemical washing pipe 120 for the first pipe is formed. And the first chemical wash pipe 220 for the second pipe, the second chemical wash pipe 140 for the first pipe, and the second chemical wash pipe 240 for the second pipe are multiplexed. A pipe line capable of supplying chemical washing water to the converted pipes (110, 210) is formed. The chemical washing apparatus U can wash the fixed pipes (110, 210) with chemical washing water by passing the chemical washing water through the circulation path.

Examples of the washing water include oxidizing agents such as sodium hypochlorite, bactericides such as 2,2-dibromo-3-nitrilopropionamide (DBNPA), chelating agents such as ethylenediaminetetraacetic acid (EDTA), A chemical solution containing an acid, an alkali, a surfactant and the like can be used. A chemical solution in which one or more of these are dissolved in water can be passed as chemical washing water. In-place cleaning by the chemical washing apparatus U is, for example, flushing clear water in one direction and draining, flushing with chemical washing water, circulation of chemical washing water on the circulation path, filling the pipe with chemical washing water Various treatments such as dipping to stand and dipping to leave the tube filled with clear fresh water are carried out in combination.

The chemical washing apparatus U is connected to the inlet side of the multiplexed pipe (the flow of the water to be treated) via the first chemical washing pipe 120 for the first pipe and the first chemical washing pipe 220 for the second pipe. The chemical wash water may flow from the upstream side), or the outlets of the multiplexed pipes via the second chemical wash pipe 140 for the first pipe and the second chemical wash pipe 240 for the second pipe Chemical wash water may be allowed to flow from the side (downstream of the water to be treated). When chemical wash water is allowed to flow from the outlet side of the multiplexed pipe, each of the multiplexed pipes (110, 210) is backwashed with chemical wash water. Microbial membranes and the like that adhere firmly in the direction of the water to be treated are easily peeled off by the chemical flow of water in the opposite flow, and thus can be cleaned effectively. In addition, the chemical wash water, fresh water, etc. which were passed through the multiplexed pipes (110, 210) are drained from the circulation path through a drain path (not shown).

As shown in FIG. 4A, the chemical washing apparatus U can be configured in the order of the chemical washing water tank 310, the chemical washing pump 320, and the filter 330 along the direction of the chemical washing water flow. In the order shown in FIG. 4A, the reaction product produced by the chemical charged in the chemical washing water tank 310, the foreign matter mixed in the chemical washing water tank 310, and the like flow into the first chemical washing pipe (120, 220). Before being filtered. Therefore, it is possible to prevent these reactants, foreign substances, and the like from flowing into the multiplexed pipe (110, 210) and causing microorganisms to propagate inside the pipe or to flow into the membrane unit 100.

Further, as shown in FIG. 4B, the chemical washing apparatus U can be configured in the order of the filter 330, the chemical washing water tank 310, and the chemical washing pump 320 along the flow direction of the chemical washing water. In the order of FIG. 4B, the contaminants remaining in the chemical wash water returned from the multiplexed pipes (110, 210) are removed by the filter 330 before flowing into the chemical wash water tank 310. . Therefore, it is possible to prevent the pollutant from reacting with the medicine charged into the chemical washing water tank 310 and weakening the effect of the medicine.

5A and 5B are diagrams illustrating a switching operation of multiplexed pipes.
FIG. 5A shows a case in which reverse osmosis treatment is performed by flowing water to be treated into the first pipe 110 among the multiplexed pipes (110, 210), while cleaning is performed by flowing chemical wash water into the second pipe 210. The open / close state of the valve is shown. FIG. 5B shows a case where chemical wash water is poured into the first pipe 110 among the multiplexed pipes (110, 210) for cleaning, while water to be treated is poured into the second pipe 210 for reverse osmosis treatment. The open / close state of the valve is shown.

As shown in FIGS. 5A and 5B, in the reverse osmosis treatment method performed using the reverse osmosis treatment apparatus 1, a part of the pipes among the multiplexed pipes (110, 210) is processed. During the reverse osmosis treatment of the water and the reverse osmosis treatment of the water to be treated, the inside of the pipe is washed by passing the chemical washing water through the remaining pipe. And reverse osmosis processing is continued, exchanging piping used for reverse osmosis processing, and piping to wash. According to such a reverse osmosis treatment method, it is possible to wash the piping communicating with the primary side of the reverse osmosis membrane without interrupting the reverse osmosis treatment. By regularly washing while replacing the pipes to be used, fouling of the reverse osmosis membrane where the pipes become a contamination source can be continuously prevented.

For example, when the first pipe 110 is used for the reverse osmosis treatment, as shown in FIG. 5A, the first inlet valve V11 and the first outlet valve V12 are opened. Further, the first chemical washing pipe valves (V13, V14) of the pipe connected to the chemical washing apparatus U are closed. On the other hand, the second inlet valve V21 and the second outlet valve V22 on the second pipe 210 side are closed. Further, the second chemical washing piping valves (V23, V24) are opened.

In the state shown in FIG. 5A, the first pipe 110 allows the water to be treated to flow toward the reverse osmosis membrane module. Therefore, the reverse osmosis process of to-be-processed water can be continued using the 1st piping 110. FIG. On the other hand, in the second pipe 210, the inside of the pipe is isolated from the water to be treated supplied for reverse osmosis treatment, and instead the chemical washing water can flow. Therefore, the inside of the second pipe 210 can be cleaned without interrupting the reverse osmosis process.

In contrast, when the second pipe 210 is used for reverse osmosis, the second inlet valve V21 and the second outlet valve V22 are opened as shown in FIG. 5B. In addition, the second chemical washing piping valves (V23, V24) of the piping connected to the chemical washing device U are closed. On the other hand, the first inlet valve V11 and the first outlet valve V12 on the first pipe 110 side are closed. Further, the first chemical washing piping valves (V13, V14) are opened.

In the state shown in FIG. 5B, on the contrary, the inside of the first pipe 110 can be cleaned while continuing the reverse osmosis treatment of the water to be treated using the second pipe 210. 5A and 5B show an example in which the multiplexed pipes (110, 210) are arranged in the treated water supply path, but the same operation is performed when they are arranged in the concentrated water discharge path. It becomes.

The valve switching operation can be performed during the operation of the reverse osmosis treatment apparatus 1. For example, when the treated water is passed through one of the multiplexed pipes (110, 210) for a certain period of time, the water quality index of the treated water supplied, for example, SDI (SiltSiDensity Index), adenosine triphosphate When there is a concern about the contamination of the pipe from the value of (ATP) or the like, or when the operation time of the membrane unit 100 reaches a predetermined time, the valve is switched, and the pipe used for reverse osmosis treatment and the pipe to be washed Can be replaced.

Each of the multiplexed pipes (110, 210) can have any pipe diameter, pipe length, thickness, shape, pressure resistance, material, etc., but it is preferable that the pipes have the same specifications. By multiplexing pipes having the same specifications, reverse osmosis treatment and cleaning can be performed under the same conditions. Therefore, when the reverse osmosis process is continued while replacing the pipe used for the reverse osmosis process and the pipe to be cleaned, no extra adjustment is required.

Next, a specific example of a position where pipes multiplexed in parallel in the supply path and the discharge path communicating with the primary side of the reverse osmosis membrane can be applied will be described.

FIG. 6 is a diagram illustrating a position where the multiplexed pipe is applied.
As shown in FIG. 6, the multiplexed pipes (110, 210) include a supply pump (first pump) 11, a pretreatment device 12, a high-pressure pump (second pump) 13, a membrane unit 100, It can apply to the reverse osmosis processing apparatus 2 provided with.

The supply pump (first pump) 11 is provided to supply the water to be treated for reverse osmosis treatment from outside the system to the membrane unit 100. For example, when the water to be treated is seawater, the taken-in seawater is supplied by the supply pump 11 after appropriate pretreatment. Turbidity, marine organisms, and the like contained in seawater are usually excluded in advance by a coagulation-precipitation process using a coagulant, a flotation separation process, a filtration process using sand filtration, filter filtration, or a sterilization process.

The pretreatment device 12 is a device that eliminates turbidity in the for-treatment water. The pretreatment device 12 is disposed downstream of the supply pump 11 in a supply path for supplying water to be treated. The pretreatment device 12 is a filter such as a bag filter, for example, and removes relatively fine turbidity by filtration.

The high-pressure pump (second pump) 13 raises the water to be treated to the osmotic pressure or higher and passes it through the reverse osmosis membrane module provided in the membrane unit 100 to reverse osmosis the reverse osmosis membrane provided in the reverse osmosis membrane module. The high-pressure pump 13 is disposed downstream of the pretreatment device 12 in the supply path for supplying the water to be treated.

The reverse osmosis treatment apparatus 2 as shown in FIG. 6 can be provided with treated water in which microorganisms are easy to propagate, such as seawater and sewage treated water. When reverse osmosis treatment is performed on water to be easily propagated by microorganisms, a chemical such as sodium hypochlorite having a bactericidal action is generally added in a section upstream from the supply pump 11 to cause fouling of the reverse osmosis membrane. Prevention is often achieved. Since chemicals containing free chlorine such as sodium hypochlorite degrade reverse osmosis membranes made of polyamide, etc., chemicals such as sodium hypochlorite supplied to the treated water are reducing agents such as sodium bisulfite. Is often neutralized by adding. In FIG. 6, the position at which such a reducing agent is added is indicated by the position of the chemical injection device including the reducing agent tank 15 and the chemical injection pump 16.

In the reverse osmosis treatment device 2 as shown in FIG. 6, the multiplexed pipes (110, 210) are connected to the section L 1 upstream of the supply pump (first pump) 11, the supply pump (first pump) 11 and the front. Sections L2 and L3 between the processing apparatus 12, a section L4 between the preprocessing apparatus 12 and the high-pressure pump (second pump) 13, and between the high-pressure pump (second pump) 13 and the membrane unit 100 Applying to one or more sections of the section L5, it is possible to arrange a series of redundant flow paths so as to form at least a part of the section.

When the multiplexed pipes (110, 210) are applied to the sections L1, L2, L3, L4, L5 upstream of the membrane unit 100, which correspond to the supply path of the water to be treated, the pipes in that section are frequently used. It becomes possible to wash. Therefore, it is possible to prevent the downstream membrane unit 100 and the like from being contaminated by contaminants such as microbial membranes deposited on the piping in the section.

In particular, among the section L2 between the supply pump 11 and the reducing agent injection point and the section L3 between the reducing agent injection point and the pretreatment device 12, the section L3 downstream from the injection point is Since the water to be treated after the reducing agent is added flows, it is a section that is easily contaminated with microorganisms. Therefore, when the multiplexed pipes (110, 210) are applied to the section L3 downstream from the chemical injection point, the sterilization action is weakened and the pipes that are easily contaminated are used by using redundant channels. Therefore, it is possible to wash frequently and effectively prevent fouling of the reverse osmosis membrane.

Further, in the sections L4 and L5 downstream from the chemical injection point and downstream from the pretreatment device 12, the water to be treated after the reducing agent is added passes through the pretreatment device 12 of the filter. Since it is a section, neutralization proceeds with stirring when passing through the filter, and the sterilization effect tends to be substantially lost. Therefore, when the multiplexed pipes (110, 210) are applied to the sections L4, L5 downstream from the chemical injection point and downstream from the pretreatment device 12, the bactericidal action is substantially lost and the contamination is likely to occur. It is possible to frequently clean the pipe using the redundant flow path, and to prevent fouling of the reverse osmosis membrane more effectively.

Further, in the reverse osmosis treatment device 2 as shown in FIG. 6, the multiplexed pipes (110, 210) are applied to the section L6 downstream of the membrane unit 100 corresponding to the concentrated water discharge path, and are redundant. It is possible to arrange the converted flow path series so as to form at least a part of the section.

When the multiplexed pipes (110, 210) are applied to the section L6 downstream from the membrane unit 100, the pipes in that section can be washed frequently. Therefore, when the concentrated water is reused, or when the concentrated water is mixed with water of different water quality and further subjected to reverse osmosis treatment, or when the concentrated water is post-treated, there is a possibility that the piping in that section may become a pollution source. Even if there is, it is possible to wash the piping in the section without interrupting the reverse osmosis treatment.

FIG. 7 is a diagram illustrating a position where a multiplexed pipe is applied.
As shown in FIG. 7, the multiplexed pipes (110, 210) include a supply pump (first pump) 11, a pretreatment device 12, a high-pressure pump (second pump) 13, and a first bank 10. The reverse osmosis treatment device 3 including the second bank 20, the power recovery device 18, and the booster pump (third pump) 19 can be applied. That is, the first bank 10 and the second bank 20 in which one or a plurality of reverse osmosis membrane modules are arranged in parallel, and the concentrated water separated by reverse osmosis treatment of treated water is further subjected to reverse osmosis treatment. It is possible to apply to a multistage reverse osmosis treatment apparatus.

The first bank 10 is provided for primary treatment of water to be treated by reverse osmosis. When the water to be treated is subjected to the reverse osmosis treatment in the first bank 10, the water to be treated is separated into the first permeated water and the first concentrated water.

The second bank 20 is provided for secondary treatment of the first concentrated water separated by the first bank 10 by reverse osmosis. When the first concentrated water is subjected to the reverse osmosis treatment in the second bank 20, the first concentrated water is separated into the second permeated water and the second concentrated water.

The power recovery device 18 is a device that boosts the water to be treated supplied to the first bank 10 using the residual pressure of the second concentrated water separated by the second bank 20. The power recovery device 18 is, for example, a pressure exchanger such as a PX (Pressure Exchanger) type or a DWEER (Dual Energy Exchanger) type, a turbocharger type energy exchanger, a Pelton turbine, etc. It is composed of a device capable of exchanging energy.

A booster pump (third pump) 19 is provided to pressurize the water to be treated that has been pressurized by the power recovery device 18. The booster pump 19 compensates the osmotic pressure that is insufficient due to the pressure increase by the power recovery device 18, and increases the water to be treated to a pressure higher than the osmotic pressure to reversely osmose the reverse osmosis membrane included in the reverse osmosis membrane module.

The reverse osmosis treatment apparatus 3 as shown in FIG. 7 can be provided with water to be treated in which microorganisms are easy to propagate, similarly to the reverse osmosis treatment apparatus 2 described above. Therefore, chemicals such as sodium hypochlorite may be added to the water to be treated, and then a reducing agent for neutralization may be added. In FIG. 7, the position where such a reducing agent is added is indicated by the position of the chemical injection device (15, 16).

In the reverse osmosis treatment device 3 shown in FIG. 7, the supply path for supplying the water to be treated is a flow path that reaches the reverse osmosis membrane module of the first bank 10 via the high pressure pump (second pump) 13, and the high pressure pump. (Second pump) 13 is divided at a branch point upstream from 13 and reaches the power recovery device 18. After passing through the booster pump (third pump) 19 from the power recovery device 18, the high pressure pump (second pump) 13. And a flow path that merges at the downstream merge point and reaches the reverse osmosis membrane module of the first bank 10.

In the reverse osmosis treatment device 3 as shown in FIG. 7, the multiplexed pipes (110, 210) are a section L 41 upstream from the branch point, and a section between the branch point and the high-pressure pump (second pump) 13. L42, section L51 between the high pressure pump (second pump) 13 and the junction, section L52 between the junction and the reverse osmosis membrane module of the first bank 10, and between the branch point and the power recovery device 18 One or more sections among section L7, section L8 between power recovery device 18 and booster pump (third pump) 19 and section L9 between booster pump (third pump) 19 and the junction It is possible to arrange the redundant flow path series so as to form at least a part of the section.

When the multiplexed pipes (110, 210) are applied to the sections L41, L42, L51, L52, L7, L8, and L9 upstream of the bank 10, which correspond to the supply path of the water to be treated, the pipes in that section Can be cleaned frequently. Therefore, it is possible to prevent the downstream banks 10 and 20 and the like from being contaminated by contaminants such as microbial films deposited on the piping in the section.

Further, in the reverse osmosis treatment device 3 as shown in FIG. 7, the multiplexed pipes (110, 210) correspond to the concentrated water discharge path, and the reverse osmosis membrane module of the first bank 10 and the second bank 20. Applied to the section L6 between the reverse osmosis membrane module, the section L10 between the reverse osmosis membrane module of the second bank 20 and the power recovery device 18, and the section L11 downstream of the power recovery device 18 to provide redundancy. It is possible to arrange the converted flow path series so as to form at least a part of the section.

When the multiplexed pipes (110, 210) are applied to the sections L6, L10, L11 downstream from the bank 10, the pipes in the sections can be frequently washed. Therefore, when reusing the concentrated water or after-treating the concentrated water, even if there is a possibility that the piping in that section may become a source of contamination, the piping in that section is not interrupted without interrupting the reverse osmosis treatment. It is possible to wash.

In the reverse osmosis treatment apparatus 3 as shown in FIG. 7, it is possible to produce desalinated water in an amount that is the sum of the amounts of water produced in the first bank 10 and the second bank 20. When the multiplexed pipes (110, 210) are applied, it becomes possible to frequently wash using the redundant flow path, and the operation of both the first bank 10 and the second bank 20 is further continued. This is advantageous in securing the amount of water produced.

In addition, in the reverse osmosis processing apparatus 3 shown in FIG. 7, the 1st bank 10 and the 2nd bank 20 are provided as a 1st process system which carries out the reverse osmosis process of the 1st to-be-processed water. However, the number of banks constituting the first processing system may be any number of one or more, and the transfer path L10 may be connected between the final stage of the first processing system and the power recovery device 18. That's fine. The structure of the other equipment of the reverse osmosis treatment device 3 is the same as that of the reverse osmosis treatment device 2 described above. In the reverse osmosis treatment device 3 as shown in FIG. 7, the power recovery device 18 and the booster pump 19 may be omitted.

FIG. 8 is a diagram illustrating a position where a multiplexed pipe is applied.
As shown in FIG. 8, the multiplexed pipes (110, 210) can be applied to the integrated reverse osmosis treatment apparatus 4. The integrated reverse osmosis treatment device 4 is a concentrated water obtained by separating the high salt concentration treated water (second treated water) by the reverse osmosis treatment of the low salt concentration treated water (first treated water). Dilute. For example, it is an integrated form using sewage treated water for seawater desalination treatment, and the first treated water with low salt concentration is applied to sewage treated water, and the second treated water with high salt concentration is applied to seawater. be able to.

The integrated reverse osmosis treatment device 4 shown in FIG. 8 includes a supply pump (first pump) 11 for first treated water, a pretreatment device 12, a high-pressure pump (second pump) 13, and a first bank. 101 and a first film unit composed of the second bank 102. Moreover, the mixing tank (mixing part) 50, the supply pump (first pump) 21 for the second treated water, the pretreatment device 22, the high-pressure pump (second pump) 23, the third bank 103, and the second A second membrane unit including four banks 104, a power recovery device 18, and a booster pump (third pump) 19 are provided.

The 1st bank 101 comprises the 1st membrane unit which carries out reverse osmosis processing of the 1st treated water of low salt concentration. When the first treated water is subjected to the reverse osmosis treatment in the first bank 101, the first treated water is separated into the first permeated water and the first concentrated water.

The second bank 102 constitutes a first membrane unit that performs reverse osmosis treatment on the first treated water, and is provided for secondary treatment of the first concentrated water separated by the first bank 101 by reverse osmosis. ing. When the first concentrated water is subjected to the reverse osmosis treatment in the second bank 102, the first concentrated water is separated into the second permeated water and the second concentrated water.

The mixing tank (mixing unit) 50 is a processing tank for mixing with the second concentrated water separated by the first membrane unit. In the mixing tank 50, the second treated water with a high salt concentration is diluted with the second concentrated water with a low salt concentration, whereby the osmotic pressure of the second treated water is lowered. Therefore, reverse osmosis processing with reduced power cost is realized.

The third bank 103 constitutes a second membrane unit that performs reverse osmosis treatment on the second treated water having a high salt concentration. For example, when the second concentrated water can be supplied, the third bank 103 performs reverse osmosis processing on the second treated water mixed with the second concentrated water in the mixing tank 50. When the second treated water is subjected to the reverse osmosis treatment in the third bank 103, the second treated water is separated into the third permeated water and the third concentrated water.

The 4th bank 104 comprises the 2nd membrane unit which carries out reverse osmosis processing of the 2nd treated water, and is provided in order to carry out secondary processing of the 3rd concentrated water separated by the 3rd bank 103 by reverse osmosis. ing. When the third concentrated water is subjected to the reverse osmosis treatment in the fourth bank 104, the third concentrated water is separated into the fourth permeated water and the fourth concentrated water.

The reverse osmosis treatment apparatus 4 as shown in FIG. 8 can be provided with the first treated water and the second treated water in which microorganisms are easy to propagate, similarly to the reverse osmosis treatment apparatuses 2 and 3 described above. Therefore, chemicals such as sodium hypochlorite may be added to the first treated water and the second treated water, and then a reducing agent for neutralization may be added. In FIG. 8, the position where such a reducing agent is added is indicated by the position of the chemical injection device (15, 16, 25, 26).

As shown in FIG. 8, the bank 102 of the first membrane unit included in the reverse osmosis treatment device 4 is a transfer path for transferring the second concentrated water separated by the second bank 102 to the mixing tank (mixing unit) 50. Used with L12 connected.

In the reverse osmosis treatment apparatus 4 as shown in FIG. 8, the multiplexed pipes (110, 210) are separated by the transfer path L12 connecting the second bank 102 and the mixing tank 50 or the first membrane unit. Applying the second treated water mixed with the concentrated water (second concentrated water) to the reverse osmosis membrane module of the first membrane unit, It can arrange | position so that it may comprise at least a part of the area.

The multiplexed pipes (110, 210) correspond to the concentrated water discharge path for the second bank 102, the transfer path L12 corresponding to the water supply path for the third bank 103, and the first membrane. When applied to the sections L1, L2, L3, L41, L42, L51, and L52 upstream of the unit bank 103, the pipes in that section can be frequently washed. Therefore, when using together the 1st treatment system which carries out reverse osmosis processing of the 1st treated water, and the 2nd treatment system which carries out reverse osmosis treatment of the 2nd treated water, from the 1st treatment system to the 2nd treatment system Even if there is a risk of inflow of contaminants, it is possible to clean the piping in that section without interrupting the integrated reverse osmosis treatment.

In the reverse osmosis treatment device 4 shown in FIG. 8, the first bank 101, the second bank 102, and the second treated water are subjected to the reverse osmosis treatment as the first treatment system for performing the reverse osmosis treatment on the first treated water. As the second processing system, a third bank 103 and a fourth bank 104 are provided. However, the number of banks constituting the membrane units of the first processing system and the second processing system may be any number of one or more, and the transfer path L12 is connected to the final stage of the first processing system and the mixing tank. 50 may be connected.

Next, a specific connection example of pipes multiplexed in parallel will be described.

9A and 9B are diagrams illustrating an example of connection of multiplexed pipes.
As shown in FIG. 9A and FIG. 9B, the multiplexed pipes (110, 210) have a branch (see FIG. 9A) that can divide the water to be treated at an intermediate portion between the inlet and outlet of the pipe. Or may have a branch (see FIG. 9B) that can be merged. In other words, the multiplexed pipes (110, 210) are applied to one or more sections across the diversion point and the confluence in the treated water supply path and the concentrated water discharge path. It is also possible to arrange the series so as to be branched. In the following figures, the injection point of the reducing agent is indicated by a white arrow.

FIG. 9A shows that the multiplexed pipes (110, 210) have a section L41 upstream from the branch point shown in FIG. 7, a section L42 between the branch point and the high-pressure pump (second pump) 13, and The state applied to the section L7 between the diversion point and the power recovery device 18 is illustrated. Each of the multiplexed pipes (110, 210) has a branch at the branch point of the water to be treated, and has one inlet on the upstream side of the flow of the water to be treated and two outlets on the downstream side. have.

As shown in FIG. 9A, each of the multiplexed pipes (110, 210) has an inlet valve (V11, V21) at an end upstream of the diversion point. In addition, outlet valves (V12, V22) are respectively provided at the downstream end of the section between the branch point and the high-pressure pump 13 and the downstream end of the section between the branch point and the power recovery device 18. Have.

Moreover, as shown to FIG. 9A, the 1st chemical | drug | medicine which the chemical | medical wash water which wash | cleans piping itself can flow through each of the multiplexed piping (110,210) downstream from a diversion point. Washing pipes (120, 220) are connected. The first chemical wash pipe (120, 220) includes a first chemical wash pipe 120 for a first pipe provided with a first chemical wash pipe valve V13 capable of closing the first chemical wash pipe itself, A first chemical wash pipe 220 for a second pipe provided with a second chemical wash pipe valve V23 capable of closing the first chemical wash pipe itself is provided for each of the branched flow path series.

Further, in each of the multiplexed pipes (110, 210), the second chemical wash pipes (140, 240) through which the chemical wash water for washing the pipes themselves can flow in the intermediate part upstream from the branch point. ) Is connected. The multiplexed pipes (110, 210) are routed through the second chemical washing pipe (140, 240) and the first chemical washing pipe (120, 220) provided for each of the branched flow paths. Thus, a circulation path through which the chemical washing water circulates is formed for each series of the flow paths.

FIG. 9B shows a section where the multiplexed pipes (110, 210) are located between the high pressure pump (second pump) 13 and the junction shown in FIG. 7, and between the junction and the first bank 10. The state applied to the section L52 and the section L9 between the booster pump (third pump) 19 and the junction is illustrated. Each of the multiplexed pipes (110, 210) has a branch at the merging point of the water to be treated, has two inlets on the upstream side of the flow of the water to be treated, and one outlet on the downstream side. have.

As shown in FIG. 9B, each of the multiplexed pipes (110, 210) includes an upstream end of a section between the high-pressure pump 13 and the junction, and a section between the booster pump 19 and the junction. Are provided with inlet valves (V11, V21), respectively. Further, outlet valves (V12, V22) are provided at the downstream end of the section between the junction and the first bank 10.

Moreover, as shown to FIG. 9B, the 1st chemical | drug | medicine which the chemical | medical wash water which wash | cleans piping itself can flow through each of the multiplexed piping (110,210) downstream from a confluence | merging point. Washing pipes (120, 220) are connected. The first chemical wash pipe (120, 220) includes a first chemical wash pipe 120 for a first pipe provided with a first chemical wash pipe valve V13 capable of closing the first chemical wash pipe itself, A first chemical wash pipe 220 for a second pipe provided with a second chemical wash pipe valve V23 capable of closing the first chemical wash pipe itself is provided for each of the branched flow path series.

In addition, in each of the multiplexed pipes (110, 210), second chemical wash pipes (140, 240) through which chemical wash water that has washed the pipes themselves can flow in an intermediate portion upstream from the junction. ) Is connected. The multiplexed pipes (110, 210) are routed through the second chemical washing pipe (140, 240) and the first chemical washing pipe (120, 220) provided for each of the branched flow paths. Thus, a circulation path through which the chemical washing water circulates is formed for each series of the flow paths.

As shown in FIGS. 9A and 9B, when the multiplexed pipe has a branch, a circulation path is formed between the branched flow path and the chemical washing apparatus U. Each of the multiplexed pipes has a structure in which each of the branched flow paths is fixedly washed with the flow of chemical wash water, thereby effectively cleaning all of the branched flow paths. Can do. 9A and 9B, one medicine washing device U is provided. However, the medicine washing device U may be provided for each of the branched flow paths. By providing and sharing one medicine washing device U, it is possible to simplify the piping structure and save chemicals. Further, by providing the chemical washing apparatus U for each series of branched flow paths, it is possible to perform appropriate cleaning for each series.

10A and 10B are diagrams illustrating an example of connection of multiplexed pipes.
As shown in FIG. 10A and FIG. 10B, when the multiplexed pipes (110, 210) are applied to a section straddling equipment for reverse osmosis treatment, pretreatment, etc., redundant flow paths are used. May be connected to a common equipment device, or may be multiplexed together with a flow path and individually connected to a plurality of equipment equipment provided for each flow path system. That is, in the reverse osmosis treatment device, only the piping may be multiplexed, or equipment such as a pump and a pretreatment device may be multiplexed together with the multiplexed piping.

FIG. 10A shows a multiplexed pipe (110, 210) in the section L3 between the reducing agent injection point and the pretreatment device 12 shown in FIG. 7, the pretreatment device 12 and the high pressure pump (second The state applied to the section L4 between the pump) 13 and the section L7 between the branch point and the power recovery device 18 is illustrated. However, each of the multiplexed pipes (110, 210) is applied to a section straddling the pretreatment device 12, and the flow path series is changed from the reductant injection point to the common pretreatment device 12. After connecting, it is separated again and multiplexed.

As shown in FIG. 10A, each of the multiplexed pipes (110, 210) has an inlet valve (V11, V21) and an outlet valve (V12, V22) in the upstream and downstream sections of the pretreatment device 12, respectively. ) Independently. In addition, each of the multiplexed pipes (110, 210) includes a first chemical washing pipe (120, 220) and a second chemical washing pipe in the sections upstream and downstream of the pretreatment device 12. (140, 240) are connected independently. Each of the redundant flow path series is connected to a common pretreatment device 12, and the water to be treated is individually filtered by the common pretreatment device 12.

FIG. 10B shows that the multiplexed pipes (110, 210) are similar to FIG. 10A in the section L3 between the reducing agent injection point and the pretreatment device 12, the pretreatment device 12 and the high pressure pump (second The state applied to the section L4 between the pump) 13 and the section L7 between the branch point and the power recovery device 18 is illustrated. However, each of the multiplexed pipes (110, 210) is applied to a section straddling the pretreatment device 12, and a plurality of pretreatment devices in which a series of flow paths are multiplexed together with the flow paths are provided. 12 and 12 are connected individually.

As shown in FIG. 10B, each of the multiplexed pipes (110, 210) has an inlet valve (V11, V21) at the end of a section upstream from the pretreatment device 12, and from the pretreatment device 12 Also have outlet valves (V12, V22) at the end of the downstream section. In addition, each of the multiplexed pipes (110, 210) is connected to the first chemical washing pipe (120, 220) in the middle part of the section downstream from the pretreatment device 12, and the pretreatment is performed. The second chemical washing pipes (140, 240) are connected to the middle part of the section upstream from the device 12. Each of the redundant flow path series is individually connected to the pretreatment apparatuses 12 and 12 multiplexed together with the flow paths, and the water to be treated is filtered by different pretreatment apparatuses 12 respectively. Yes.

As shown in FIG. 10A and FIG. 10B, when a multiplexed pipe is applied to a section straddling equipment for reverse osmosis treatment or pretreatment, a series of redundant flow paths is common. If it arrange | positions so that it may connect with an installation apparatus (refer FIG. 10A), since it is not necessary to provide an installation apparatus for every series of a flow path, there exists an advantage by which the installation cost of an installation apparatus is reduced. On the other hand, when arranged so as to be individually connected to a plurality of equipment devices multiplexed together with the flow path (see FIG. 10B), the equipment is provided with piping communicating with the primary side of the reverse osmosis membrane without interrupting the reverse osmosis treatment. There is an advantage that the apparatus can be cleaned.

According to the reverse osmosis treatment apparatus and the reverse osmosis treatment method according to the above embodiment, a part of at least one of the supply path of the water to be treated and the discharge path of the concentrated water connected to the primary side of the reverse osmosis membrane However, it is composed of multiple pipes that are arranged in parallel, so that some of the pipes are used for reverse osmosis treatment of the water to be treated, and the remaining pipes during the reverse osmosis treatment of the water to be treated It is possible to let chemical wash water flow through. Therefore, it is possible to continue the reverse osmosis process even when cleaning the pipe attached to the apparatus and communicating with the primary side of the reverse osmosis membrane. Therefore, fouling of the reverse osmosis membrane, in which the piping becomes a contamination source, can be continuously prevented while keeping the operating rate of the apparatus high.

Next, a modified example of the reverse osmosis treatment apparatus having multiplexed pipes will be described.

FIG. 11 is a diagram illustrating a configuration example of a reverse osmosis treatment device according to a modification.
As shown in FIG. 11, the reverse osmosis treatment apparatus 1 including the multiplexed pipes (110, 210) further includes a liquid detector D, and the inlets and outlets of the multiplexed pipes (110, 210). Between the injection pipe (160, 260) capable of injecting the water to be treated into the pipe itself, and an extraction pipe (180, 260) for extracting the liquid in the pipe itself and sending it to the liquid detector D. 280) may be further connected (reverse osmosis treatment apparatus 1A according to a modification).

The injection pipes (160, 260) are provided so that the water to be treated can be injected into the pipes of the multiplexed pipes (110, 210). The injection pipes (160, 260) are provided for replacing the liquid in the pipe after the chemical washing water is passed through and washed with the water to be treated. In FIG. 11, the injection pipe (160, 260) includes a first injection pipe 160 provided with a first injection pipe valve V16 capable of closing the injection pipe itself and a second injection pipe valve V26 capable of closing the injection pipe itself. The second injection tube 260 is provided with two. One end of the injection pipe (160, 260) is connected to each inlet side (upstream side of the flow of water to be treated) of the multiplexed pipes (110, 210) in FIG. And may be connected at any position between the outlet and the outlet. Further, the other end of the injection pipe (160, 260) may be connected to an arbitrary section of the supply path of the water to be treated.

The extraction pipes (180, 280) are provided so that the liquid in the pipes of the multiplexed pipes (110, 210) can be extracted to the liquid detector D. The extraction pipes (180, 280) are provided for detecting the liquid in the pipe after the chemical wash water is passed through and washed, and grasping the degree of residual chemical wash water. In FIG. 11, the extraction pipes (180, 280) include a first extraction pipe 180 provided with a first extraction pipe valve V18 capable of closing the extraction pipe itself, and a second extraction pipe valve V28 capable of closing the extraction pipe itself. The second extraction tube 280 is provided with two. One end of the extraction pipe (180, 280) is connected to each outlet side of the multiplexed pipes (110, 210) (downstream of the water to be treated) in FIG. And may be connected at any position between the outlet and the outlet. On the other hand, the other end of the extraction pipe (180, 280) is connected to the liquid detector D.

The liquid detector D is composed of a detector capable of detecting properties such as pH and electrical conductivity of the liquid. The liquid detector D measures pH, electrical conductivity, etc., and can detect chemical washing water and the like from the composition of the liquid. Various pH meters equipped with hydrogen electrodes, glass electrodes, semiconductor sensors, etc. Appropriate equipment such as various electric conductivity meters such as an AC type and an electromagnetic induction type can be used.

In the reverse osmosis treatment method performed using the reverse osmosis treatment apparatus 1A according to the modification, the water to be treated is subjected to reverse osmosis treatment using some of the multiplexed pipes (110, 210). During the reverse osmosis treatment of the water to be treated, the inside of the pipe is washed by passing the chemical washing water through the remaining pipe. And the liquid in the pipe | tube of the wash | cleaned piping is extracted to a liquid detector, After detecting that the liquid in a pipe | tube was substituted with the to-be-processed water, to-be-processed water is inject | poured into a pipe. And to-be-processed water is inject | poured into piping and the piping used for reverse osmosis processing and the piping to wash | clean are replaced.

The valve switching operation of the reverse osmosis treatment apparatus 1A is performed when the pipe used for the reverse osmosis treatment and the pipe to be washed are exchanged. In order to clean the multiplexed pipes (110, 210) communicating with the primary side of the reverse osmosis membrane without interrupting the reverse osmosis treatment, a valve on the first pipe 110 side and a valve on the second pipe 210 side are used. Are preferably switched synchronously. However, if the pipe used for the reverse osmosis treatment and the pipe to be washed are replaced at the same time, the chemical washing water that has flowed into the pipe flows into the membrane unit 100, and therefore it is preferable to provide a step for preparing switching. .

The following Table 1 shifts from the step (1) for cleaning the first piping 110 to the step (3) for cleaning the second piping 210 through the step (2) for preparing the switching of the first piping 110, The state of piping and a valve when continuing reverse osmosis processing is illustrated, passing through the process (4) which prepares switching of the 2nd piping 210 again.

As shown in Table 1, in the step (1) of cleaning the first pipe 110, the first inlet valve V11 and the first outlet valve V12 of the first pipe 110 are closed, and the first chemical washing pipe valve (V13, By opening V14), the chemical washing water is passed into the pipe through the circulation path. On the other hand, the second inlet valve V21 and the second outlet valve V22 of the second pipe 210 are opened and the second chemical washing pipe valves (V23, V24) are closed, so that the water to be treated is directed toward the membrane unit 100. The reverse osmosis treatment is performed after being supplied. The injection tube (160, 260) and the extraction tube (180, 280) are both closed.

In the step (2) of preparing the switching of the first piping 110, the first chemical cleaning piping valves (V13, V14) are closed, and the flow of chemical cleaning water to the first piping 110 is stopped. Moreover, the 1st injection pipe valve V16 is opened, to-be-processed water is inject | poured into the 1st piping 110, and the liquid in a pipe | tube is substituted with to-be-processed water. At the same time, the first extraction pipe valve V18 is opened, the liquid in the pipe of the first pipe 110 is extracted to the liquid detector D, and it is detected whether or not the liquid in the pipe is replaced with the water to be treated.

In the step (3) of cleaning the second pipe 210, both the injection pipe (160, 260) and the extraction pipe (180, 280) are returned to the closed state. Then, the second inlet valve V21 and the second outlet valve V22 of the second pipe 210 are closed, and the second chemical washing pipe valves (V23, V24) are opened, so that chemical washing water passes through the circulation path into the pipe. Watered. On the other hand, the first inlet valve V11 and the first outlet valve V12 of the first pipe 110 are opened, and the first chemical washing pipe valves (V13, V14) are closed, so that the water to be treated is directed toward the membrane unit 100. The reverse osmosis treatment is performed after being supplied.

In the step (4) of preparing the switching of the second piping 210, the second chemical cleaning piping valves (V23, V24) are closed, and the flow of chemical cleaning water to the second piping 210 is stopped. Moreover, the 2nd injection pipe valve V26 is opened, to-be-processed water is inject | poured into the 2nd piping 210, and the liquid in a pipe | tube is substituted with to-be-processed water. Further, the second extraction pipe valve V28 is opened, the liquid in the pipe of the second pipe 210 is extracted to the liquid detector D, and it is detected whether or not the liquid in the pipe is replaced with the water to be treated.

According to the reverse osmosis treatment apparatus and the reverse osmosis treatment method according to the above modification, when the pipe used for the reverse osmosis treatment and the pipe to be washed are replaced, the liquid inside the washed pipe is surely replaced with the water to be treated. For this reason, it is possible to prevent the piping in which the chemical washing water remains in the pipe from being used for supplying the water to be treated. Therefore, it is possible to avoid deterioration of the reverse osmosis membrane due to the chemical used for cleaning the pipe. In addition, when the pipe used for reverse osmosis treatment and the pipe to be washed are exchanged, the water to be treated is injected into the pipe through the injection pipe. There is no need to interrupt. Therefore, it is possible to maintain a high operating rate, replace the liquid in the pipe, and prevent the reverse osmosis membrane from deteriorating.

As mentioned above, although this invention was demonstrated, this invention is not limited to the said embodiment and modification, A various change is possible in the range which does not deviate from the meaning of this invention. For example, the present invention is not necessarily limited to the one having all the configurations included in the above-described embodiments and modifications. A part of the configuration of the embodiment or the modified example is replaced with another configuration, a part of the configuration of the embodiment or the modified example is added to another configuration, or a part of the configuration of the embodiment or the modified example is omitted. Can be.

For example, the reverse osmosis treatment apparatus 1A according to the modified example includes any of the reverse osmosis treatment apparatus 2 illustrated in FIG. 6, the reverse osmosis treatment apparatus 3 illustrated in FIG. 7, and the reverse osmosis treatment apparatus 4 illustrated in FIG. You may apply. Moreover, although the example which has arrange | positioned the multiplexed piping (110,210) in the supply path of to-be-processed water is shown in FIG. 11, you may arrange | position to the discharge path of concentrated water.

The reverse osmosis treatment apparatus 1A according to the modification includes the injection pipe (160, 260), the extraction pipe (180, 280), and the liquid detector D, but the injection pipe (160, 260). 260) only, or only the extraction tube (180, 280) and the liquid detector D may be provided. When only the injection tube (160, 260) is provided, the liquid in the tube may be detected by an appropriate method or may not be detected. Further, when only the extraction pipe (180, 280) and the liquid detector D are provided, the liquid in the pipe may be replaced with water to be treated by an appropriate method, or the liquid in the pipe is replaced with clean water or the like. Also good.

In addition, the multiplexed pipes (110, 210) may be arranged in the entire section or a further arbitrary section of the treated water supply path and the concentrated water discharge path. . In addition, the multiplexed pipes (110, 210) may have a plurality of branches (see FIG. 9A) to which the water to be treated can be diverted or a branch (see FIG. 9B) that can be merged, or both. You may have. Moreover, the multiplexed pipes (110, 210) may be multiplexed to three or more. In addition, when the multiplexed pipes (110, 210) are applied in combination with a plurality of sections or further arbitrary arbitrary sections, a chemical washing apparatus U may be provided for each pipe. However, it is also possible to improve efficiency by sharing and using differently by switching valves.

1, 2, 3, 4 Reverse osmosis treatment device 5 Pressure vessel 5a Inlet port 5b Outlet port 6 Reverse osmosis membrane element 6a Membrane laminate 7 Reverse osmosis membrane 8 Water collecting pipe 8a Through hole 9 Spacer 10 First bank 11 Supply pump ( First pump)
12 Pretreatment device 13 High-pressure pump (second pump)
15 Reducing agent tank 16 Chemical injection pump 20 2nd bank 100 Membrane unit 101 1st bank 102 2nd bank 103 3rd bank 104 4th bank 110 1st piping 120 1st medicine washing piping 140 for 1st piping 1st Second chemical wash pipe 210 Second pipe 220 First chemical wash pipe 240 for second pipe Second chemical wash pipe 310 for second pipe Chemical wash water tank 320 Chemical wash pump 330 Filter D Liquid detector U Chemical washing device V11 First inlet valve V12 First outlet valve V13 First chemical washing pipe valve V14 Second chemical washing pipe valve V16 First injection pipe valve V18 First extraction pipe valve V21 Second inlet valve V22 Second outlet valve V23 First chemical washing piping valve V24 Second chemical washing piping valve V26 Second injection pipe valve V28 Second extraction pipe valve

Claims (8)

A membrane unit comprising one or a plurality of reverse osmosis membrane modules for reverse osmosis treatment of water to be treated is provided,
A part of at least one of a supply path for supplying the water to be treated to the reverse osmosis membrane module and a discharge path for discharging the concentrated water separated by the reverse osmosis treatment from the reverse osmosis membrane module Consists of multiple pipes arranged in parallel,
Each of the pipes has an inlet valve capable of closing an inlet of the pipe and an outlet valve capable of closing an outlet of the pipe, and the pipe is disposed in an intermediate portion between the inlet and the outlet. A reverse osmosis treatment device connected to a chemical washing pipe capable of supplying chemical washing water to be washed. The reverse osmosis treatment device according to claim 1,
A first pump for supplying water to be treated;
A pretreatment device disposed downstream of the first pump to eliminate turbidity in the treated water;
A second pump that is disposed downstream of the pretreatment device and pressurizes the water to be treated to reverse osmosis the reverse osmosis membrane;
The pipe includes a section upstream of the first pump, a section between the first pump and the pretreatment device, a section between the pretreatment device and the second pump, and the second pump. A reverse osmosis treatment device forming a series of flow paths in one or more sections among sections between the membrane unit and the membrane unit. The reverse osmosis treatment device according to claim 2,
The membrane unit is
A first bank in which one or a plurality of reverse osmosis membrane modules for primary treatment of water to be treated are arranged in parallel;
A second bank in which one or a plurality of reverse osmosis membrane modules for secondary treatment of the first concentrated water separated by the first bank are arranged in parallel;
The reverse osmosis treatment device comprises:
A power recovery device that boosts the water to be treated supplied to the first bank using the residual pressure of the second concentrated water separated by the second bank;
A third pump for pressurizing the water to be treated that has been pressurized by the power recovery device,
The supply path is divided into a flow path that reaches the reverse osmosis membrane module through the second pump and a branch point upstream of the second pump to reach the power recovery apparatus, and from the power recovery apparatus to the first After passing through 3 pumps, and a flow path that merges at a merge point downstream of the second pump and reaches the reverse osmosis membrane module,
The discharge path includes a flow path from the reverse osmosis membrane module to the power recovery device,
The piping includes a section upstream from the branch point, a section between the branch point and the second pump, a section between the second pump and the junction point, the junction point and the reverse osmosis membrane module. A section between the branch point and the power recovery device, a section between the power recovery device and the third pump, and a section between the third pump and the junction. Among them, a reverse osmosis treatment apparatus forming a series of flow paths in one or more sections. The reverse osmosis treatment device according to claim 3,
The pipe includes a section upstream from the first pump, a section between the first pump and the pretreatment device, a section between the pretreatment device and the second pump, the second pump and the A section between the reverse osmosis membrane module, a section upstream of the branch point, a section between the branch point and the second pump, a section between the second pump and the junction point, the junction point And a section between the reverse recovery osmosis membrane module, a section between the diversion point and the power recovery apparatus, a section between the power recovery apparatus and the third pump, and the third pump and the merge. Among the sections between the points, the flow path is made up of two or more sections,
A reverse osmosis treatment apparatus in which the series of the flow paths are individually connected to a plurality of equipment devices provided for each series. A first membrane unit in which one or a plurality of banks for reverse osmosis treatment of the first treated water is disposed;
A mixing section for mixing the second treated water with the concentrated water separated by the first membrane unit;
A second membrane unit in which one or more banks for reverse osmosis treatment of the second treated water mixed with the concentrated water are disposed,
The bank comprises one or more reverse osmosis membrane modules for reverse osmosis treatment of water to be treated,
A transfer path for transferring the concentrated water separated by the first membrane unit to the mixing unit, and supplying the second treated water mixed with the concentrated water to the reverse osmosis membrane module. A part of at least one of the supply paths is constituted by a plurality of pipes arranged in parallel,
Each of the pipes has an inlet valve capable of closing an inlet of the pipe and an outlet valve capable of closing an outlet of the pipe, and the pipe is disposed in an intermediate portion between the inlet and the outlet. A reverse osmosis treatment device connected to a chemical washing pipe capable of supplying chemical washing water to be washed. A membrane unit comprising one or a plurality of reverse osmosis membrane modules for reverse osmosis treatment of water to be treated is provided,
A part of at least one of a supply path for supplying the water to be treated to the reverse osmosis membrane module and a discharge path for discharging the concentrated water separated by the reverse osmosis treatment from the reverse osmosis membrane module Consists of multiple pipes arranged in parallel,
In each of the pipes, a reverse osmosis treatment apparatus in which a chemical washing pipe capable of supplying chemical washing water for washing the pipe is connected to an intermediate portion between the inlet of the pipe and the outlet of the pipe,
Reverse osmosis treatment of the treated water using a part of the piping among the piping,
During reverse osmosis treatment of the water to be treated, the chemical washing water is passed through the remaining pipe to wash the inside of the pipe,
A reverse osmosis treatment method for continuing reverse osmosis treatment while replacing the piping used for reverse osmosis treatment and the piping to be washed. Each of the pipes is further connected to an intermediate portion between the inlet of the pipe and the outlet of the pipe, and an injection pipe capable of injecting the water to be treated into the pipe.
The reverse osmosis treatment method according to claim 6, wherein after the inside of the pipe is washed, the water to be treated is poured into the pipe, and then the pipe used for the reverse osmosis treatment and the pipe to be washed are exchanged. Each of the pipes is further connected to an intermediate part between the inlet of the pipe and the outlet of the pipe, and an extraction pipe for extracting the liquid in the pipe to the liquid detector,
After washing the inside of the pipe, the liquid in the pipe is extracted into a liquid detector,
The reverse osmosis treatment method according to claim 7, wherein the water in the pipe is detected to be replaced with the water to be treated, and the water to be treated is injected into the pipe.

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