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WO2018198245A1 - Installation à membrane d'osmose inverse et procédé de fonctionnement d'une installation à membrane d'osmose inverse - Google Patents

Installation à membrane d'osmose inverse et procédé de fonctionnement d'une installation à membrane d'osmose inverse Download PDF

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Publication number
WO2018198245A1
WO2018198245A1 PCT/JP2017/016612 JP2017016612W WO2018198245A1 WO 2018198245 A1 WO2018198245 A1 WO 2018198245A1 JP 2017016612 W JP2017016612 W JP 2017016612W WO 2018198245 A1 WO2018198245 A1 WO 2018198245A1
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WIPO (PCT)
Prior art keywords
water
reverse osmosis
osmosis membrane
biofilm
inspection
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2017/016612
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English (en)
Japanese (ja)
Inventor
嘉晃 伊藤
竹内　和久
英夫 鈴木
岳 近藤
みよ子 田島
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Mitsubishi Heavy Industries Engineering Ltd
Original Assignee
Mitsubishi Heavy Industries Engineering Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Heavy Industries Engineering Ltd filed Critical Mitsubishi Heavy Industries Engineering Ltd
Priority to PCT/JP2017/016612 priority Critical patent/WO2018198245A1/fr
Priority to JP2019514534A priority patent/JPWO2018199093A1/ja
Priority to PCT/JP2018/016614 priority patent/WO2018199093A1/fr
Publication of WO2018198245A1 publication Critical patent/WO2018198245A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
    • B01D65/10—Testing of membranes or membrane apparatus; Detecting or repairing leaks
    • B01D65/109—Testing of membrane fouling or clogging, e.g. amount or affinity
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
    • B01D61/02—Reverse osmosis; Hyperfiltration ; Nanofiltration
    • B01D61/10—Accessories; Auxiliary operations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
    • B01D61/02—Reverse osmosis; Hyperfiltration ; Nanofiltration
    • B01D61/12—Controlling or regulating

Definitions

  • the present invention relates to a reverse osmosis membrane plant and a method for operating a reverse osmosis membrane plant.
  • RO membrane reverse osmosis membrane
  • RO membrane reverse osmosis membrane
  • biofilm adhesion when evaluating biofilm adhesion using the technique of Patent Document 1, even if biofilm adhesion is confirmed after measurement of at least about 30 days (1.5 months in the examples), the actual machine Since biofilm adhesion has already started on the reverse osmosis membrane of the plant, it can be used as an index for cleaning, but it is not an index for preventing biofilm from adhering to the reverse osmosis membrane of the actual plant. It was.
  • an object of the present invention is to provide a reverse osmosis membrane plant and a method of operating a reverse osmosis membrane plant that can more quickly grasp the trend of biofilm adhesion to a reverse osmosis membrane.
  • the first invention of the present invention for solving the above-mentioned problem is that an inflow water line for inflowing inflow water is connected, and the permeated water from which the salinity is removed from the inflow water and the salinity in the inflow water are concentrated.
  • a reverse osmosis membrane device having a reverse osmosis membrane for obtaining concentrated water, a branch line branched from the inflow water line and branching a part of the inflow water as test water, the branch line is connected, and the inside At least one or more test containers for passing test water and the test container are attached, the biofilm derived from the test water adheres, and the biofilm adheres more than the material of the reverse osmosis membrane
  • An inspection carrier made of a material, and a biofilm inspection device that stops the passage of the inspection water to the inspection container and inspects the amount of biofilm attached to the inspection carrier. In the reverse osmosis membrane plant to be.
  • the second invention is characterized in that, in the first invention, the biofilm adhesion of the test carrier is evaluated by comparing the amount of biofilm deposited with the material of the reverse osmosis membrane. Located in reverse osmosis membrane plant.
  • the biofilm inspection apparatus performs the inspection on the test carrier at a predetermined time or a predetermined number of times less than one day from the beginning of passing the inspection water. It exists in the reverse osmosis membrane plant characterized by evaluating the adhesion amount of a film.
  • a fourth invention is the reverse osmosis membrane plant according to any one of the first to third inventions, wherein the test carrier has flexibility.
  • the fifth invention is the reverse osmosis membrane plant according to any one of the first to fourth inventions, wherein the evaluation of the adhesion of the biofilm is evaluated by an ATP measurement method.
  • the flow of the inspection water is equivalent to the linear velocity of the inflow water on the membrane surface of the reverse osmosis membrane. Located in the osmosis membrane plant.
  • the seventh invention is the reverse osmosis membrane plant according to any one of the first to sixth inventions, further comprising a pretreatment unit for removing turbid components in the inflow water.
  • the eighth invention includes a reverse osmosis membrane step of separating by a reverse osmosis membrane to obtain permeated water from which salinity has been removed from inflow water and concentrated water in which the salinity in the inflow water is concentrated, and a part of the inflow water.
  • a test water flow process for branching as test water and allowing the test water to flow inside the test container; and at least one of the test water is stored in the test container, and the biofilm adheres more than the material of the reverse osmosis membrane
  • a biofilm adhering step for adhering the biofilm derived from the test water to the test carrier made of a high-quality material, and stopping the water flow of the test water to the test container and attaching the biofilm adhering to the test carrier
  • the biofilm adhesion amount measuring step for measuring the film adhesion amount
  • the biofilm adhesion amount measurement step the biofilm adhesion amount is evaluated for a predetermined time or a predetermined number of times less than a day from the beginning of water flow. That has a biofilm adhered evaluation step, and based on the evaluation, in an operating method of the reverse osmosis membrane plant and controls the operation of the reverse osmosis membrane process.
  • the biofilm adhesion of the test carrier is evaluated by comparing the amount of biofilm deposited with the material of the reverse osmosis membrane.
  • a tenth aspect of the invention is the reverse osmosis membrane plant according to the eighth or ninth aspect, wherein the water flow of the inspection water is equivalent to the linear velocity of the inflow water on the membrane surface of the reverse osmosis membrane. It is in the driving method.
  • the material for the test carrier is a material having higher biofilm adhesion than the material of the reverse osmosis membrane used in the actual machine. The presence or absence of biofilm adhesion can be confirmed. As a result, it is possible to quickly predict the trend of adhesion of the reverse osmosis membrane device of the actual plant to the reverse osmosis membrane.
  • FIG. 1 is a schematic diagram of a reverse osmosis membrane plant according to a first embodiment.
  • FIG. 2 is a configuration diagram of the test container and the test carrier according to the first embodiment.
  • FIG. 3 is a configuration diagram of another test container and a test carrier according to the first embodiment.
  • FIG. 4 is a configuration diagram of another test container and a test carrier according to the first embodiment.
  • FIG. 5 is a schematic diagram of a material evaluation test apparatus for a test carrier.
  • FIG. 6 is a schematic diagram of a simple material evaluation test apparatus for a test carrier.
  • FIG. 7 is a graph of the material evaluation test result of the test carrier.
  • FIG. 8 is a bar graph showing the result of the material evaluation test of the test carrier.
  • FIG. 9 is a schematic diagram of a reverse osmosis membrane plant according to the second embodiment.
  • FIG. 10 is a flowchart of evaluation.
  • FIG. 11 is a schematic diagram of a reverse osmosis membrane plant according to
  • FIG. 1 is a schematic diagram of a reverse osmosis membrane plant according to a first embodiment.
  • a reverse osmosis membrane plant 100 ⁇ / b> A according to the present embodiment is connected to an inflow water line L 1 for flowing in inflow water 11, and permeated water 12 and inflow water 11 from which salinity has been removed.
  • a reverse osmosis membrane device 15 having a reverse osmosis membrane 14 for obtaining concentrated water 13 in which the salt content is concentrated, and a branch line branched from the inflow water line L 1 and branching a part of the inflow water 11 as the inspection water 21.
  • L 11 is connected to the branch line L 11 , and at least one or more inspection containers 22 for passing the inspection water 21 therein are accommodated in the inspection container 22, and a biofilm derived from the inspection water 21 adheres thereto.
  • the flow of the test carrier 23 made of a material having higher biofilm adhesion than the material of the reverse osmosis membrane 14 and the test water 21 to the test container 22 is stopped, and the bio adheres to the test carrier 23.
  • Reference numeral 31 is the drug
  • 32 illustrates a drug supply unit for supplying a drug 31 by the drug supply line L 21.
  • a pre-processing unit such as a sand filtration device, a UF membrane (ultrafiltration membrane) or an MF membrane (microfiltration membrane) for removing turbid components in seawater is used as in the conventional case. It may be preprocessed by using (omitted in the first embodiment).
  • NF membrane 14 of the reverse osmosis membrane device 15 in addition to general reverse osmosis, an NF (Nano Filtration) membrane (hereinafter also referred to as “NF membrane”) or the like can be used.
  • the reverse osmosis membrane is mostly made of aromatic polyamide.
  • the influent water 11 as raw water is processed by the reverse osmosis membrane device 15 to obtain the permeated water 12 which is fresh water and the concentrated water 13 in which the salinity is concentrated.
  • water other than seawater may be used as raw water.
  • the inflow water 11 for example, pumped seawater, seawater once used in the plant as a refrigerant, or the like can be used, and it is not limited.
  • the inspection container 22 is interposed in a branch line L 11 branched from the inflow water line L 1, and a part of the inflow water 11 is passed therethrough as inspection water 21.
  • An inspection carrier 23 is accommodated in the inspection container 22.
  • the test carrier 23 is made of a material having higher biofilm adhesion than the material of the reverse osmosis membrane 14 used in the reverse osmosis membrane device 15 (for example, a polyamide-based composite material).
  • FIG. 2 is a configuration diagram of the test container and the test carrier according to the first embodiment. As shown in FIG. 2, the outer surface 23 a of the test carrier 23 and the inner surface 22 a of the test container are arranged in the test container 22 so as to be in close contact with each other. Then, the inspection water 21 flowing into the inspection container 22 is passed through the inner surface 23b of the inspection carrier 23, and a biofilm is adhered to the inner surface 23b.
  • the inspection container 22 is sealed with a removable lid 24 after the inspection carrier 23 is accommodated therein.
  • a connecting jig 25 connected to the branch line L 11 is provided on the bottom side of the inspection container 22 and the upper side of the lid body 24.
  • a flow rate adjustment valve (not shown) for adjusting the inflow amount is provided on the inlet side of the inspection container 22.
  • the water flow of the inspection water 21 is equal to the linear velocity of the inflow water 11 on the membrane surface of the reverse osmosis membrane 14 installed in the reverse osmosis membrane device 15 of the actual machine. Thereby, it will be set as the conditions similar to the adhesion environment of the biofilm in an actual machine.
  • the typical linear velocity is preferably in the range of 50 to 350 mm / sec.
  • test carriers 23 are accommodated in the test container 22, and the test carriers 23 are taken out every predetermined time or every predetermined number of times in a day. You may make it confirm adhesion of a film.
  • the plurality of inspection carriers 23 are not limited to cylindrical ones.
  • a flexible film-like one is rolled and stored in the inspection container 22. You may make it do.
  • the biofilm inspection apparatus performs the amount of biofilm adhering to the inspection carrier 23 using an inspection apparatus that measures the amount of ATP per unit area.
  • This inspection device collects an attached biofilm and reacts with a coloring reagent to indirectly determine the ATP amount from the coloring amount of the reagent, and a commercially available measuring instrument can be used.
  • a commercially available measuring instrument can be used.
  • ATP wiping inspection kit manufactured by Nitta)” and the like can be exemplified.
  • ATP Addenosine tri-phosphate: adenosine triphosphate
  • the bioluminescence principle is applied. ATP is reacted with a coloring reagent, and the amount of ATP is determined by a fluorescence measuring instrument.
  • the amount of biofilm adhered to the inner surface 23b of the test carrier 23 is evaluated by the ATP measurement method, and the slope of the time-dependent graph of the amount of ATP per unit area is determined as a biofilm formation rate (BFR). You may make it ask as.
  • the material of the test carrier 23 used in this evaluation is a material (for example, PP, polyvinyl chloride, or the like) that has higher biofilm adhesion than the material of the reverse osmosis membrane 14 (for example, polyamide-based composite material), as shown in the following test examples. Silicone) is used, so every predetermined time (for example, 1, 2, 3 hours) less than one day from the beginning (0 hour) of the start of the test water 21 or every predetermined number of times (at least every 1 to 6 hours) The amount of biofilm attached to the test carrier 23 is evaluated in one unit.
  • a material for example, PP, polyvinyl chloride, or the like
  • Silicone silicone
  • the reverse osmosis of the reverse osmosis membrane device 15 of the actual plant since the presence or absence of biofilm adhesion can be confirmed within a few hours (for example, 2 to 8 hours) less than a day from the start of evaluation, the reverse osmosis of the reverse osmosis membrane device 15 of the actual plant. The trend of adhesion to the film 14 can be predicted quickly.
  • SDI Silicon Density Index
  • FI value the fouling index
  • the evaluation can be completed in less than one day, and an operation that does not cause biofilm adhesion can be performed in accordance with the evaluation result. Specifically, when adhesion is expected, measures such as changing the pretreatment mode, changing the type and amount of the sterilizing agent, and adjusting the frequency of the agent treatment are performed to form a biofilm. Can be blocked.
  • the trend of adhesion is less than a day. It can be evaluated quickly in an extremely short time. And according to the degree of adhesion of this biofilm, measures such as pretreatment and sterilization treatment can be taken. As a result, the RO membrane plant can be operated stably.
  • FIG. 5 is a schematic diagram of a material evaluation test apparatus for a test carrier.
  • a plurality of inspection carriers 23-1 to 23-4 of the same type are stored in the inspection container 22.
  • the test apparatus 50 includes a seawater tank 52 for storing the sea water 51, through the supply pump 53 from the seawater tank 52, a circulation line L 51 that circulates the seawater 51 is interposed the circulation line L 51 And an inspection container 22.
  • a flow rate adjusting valve 54 is installed on the downstream side of the supply pump 53, thereby adjusting the flow rate of the seawater 51 to the inspection container 22, and part of the seawater whose flow rate has been adjusted is contained in the seawater tank 52. It is returning.
  • test carrier 23 (1) polypropylene (PP), (2) polyvinyl chloride (PVC), and (3) silicone are selected for the test carrier 23, and (4) reverse osmosis membrane (RO A polyamide-based composite material as the material of the film 14 was used.
  • the shape of the test carrier 23 was a cylindrical tube having an outer diameter of 15 mm, an inner diameter of 12 mm, and a length of 20 mm.
  • the seawater 51 for testing was pH 8.0 and EC 4.5 S / m.
  • filtered water obtained by filtering seawater through a filter having a pore diameter of 0.75 ⁇ m was used.
  • the linear velocity of the flowing seawater 51 in the inspection container 22 was set to 250 mm / sec.
  • the measurement of the test carrier 23 was performed using a biomass measurement kit “Lucipak II (trade name: manufactured by Kikkoman Biochemifa)”. Specifically, the inner peripheral surface 23b of the test carrier 23 was wiped off with an attached cotton swab, and then the cotton swab was returned to the measuring device main body, mixed with the reagent, the measurement tube was removed, and the amount of luminescence was measured. That is, the amount of biofilm adhered to the test carrier 23 was periodically evaluated by the ATP measurement method. Then, the attached ATP amount was divided by the wiped area, the ATP amount per unit area was calculated, and the change with time of the ATP amount per unit area was confirmed.
  • Lucipak II trade name: manufactured by Kikkoman Biochemifa
  • This time course graph was defined as BFR (ATP (pg) / cm 2 / d).
  • This ATP adenosine triphosphate
  • This ATP is a chemical substance that exists as an energy source for all living organisms, and by measuring the amount of ATP, the amount of “existence of organisms or traces of organisms” can be measured.
  • FIGS. Table 1 shows the BFR results for the carrier material.
  • FIG. 7 is a graph of the material evaluation test result of the test carrier
  • FIG. 8 is a bar graph of the material evaluation test result of the test carrier (FIG. 8 shows an error range of three times. )
  • each material of polypropylene (PP) and polyvinyl chloride (PVC) becomes remarkable after 2 hours from the start of evaluation, and further after 4 hours and after 6 hours. Became prominent. It has been found that each material of polypropylene (PP), polyvinyl chloride (PVC), and silicone has higher adhesive properties than the material of the RO membrane.
  • test carrier 23 is performed by simple evaluation using a beaker in addition to storing the test carrier 23 in a test container 22 as shown in FIG. be able to.
  • FIG. 6 is a schematic diagram of a simple material evaluation test apparatus for a test carrier.
  • the simple test is performed by putting seawater 51 into a beaker container 61 and placing the test carrier 23 to be evaluated on an indicator member 62 such as a wire mesh. Then, the seawater is gently stirred at a predetermined rotation using the stirring blades 63 of the stirrer, and the adhesion of the biofilm to the test carrier 23 is confirmed.
  • the evaluation of the material is performed by measuring the amount of biofilm attached at regular intervals (for example: at least once every 1, 2, 3 hours) from the beginning of the evaluation (0 hours). Then, it is evaluated in comparison with the amount of biofilm deposited on the reverse osmosis membrane material.
  • an evaluation material having an amount of adhesion earlier than the material of the reverse osmosis membrane of the reverse osmosis membrane device it is possible to confirm the biofilm adhesion earlier than the adhesion to the reverse osmosis membrane.
  • the same material as the reverse osmosis membrane 14 used in the actual reverse osmosis membrane device 15 as a basis for comparison, further objective evaluation can be performed.
  • it is comparative evaluation of a material it is not limited to less than one day, You may make it confirm by performing evaluation more than one day.
  • FIG. 9 is a schematic diagram of a reverse osmosis membrane plant according to the second embodiment.
  • symbol is attached
  • the worker stores the inspection carrier 23 in the inspection container 22.
  • the number of inspection carriers 23 in the storage container 22 may be one or plural.
  • when one is stored it is confirmed once a day.
  • confirmation is made several times a day (once every predetermined time (for example, 2 to 3 hours)).
  • a plurality of test carriers may be accommodated, and a plurality of test carriers may be extracted at the same time, and the ATP amount and the like may be confirmed by a plurality, and the average value may be calculated.
  • the extracted test carrier 23 is brought into the biofilm evaluation apparatus 35, where biofilm adhesion is confirmed.
  • the amount of ATP itself may be confirmed using the above-described commercially available test kit, or the slope by BFR may be obtained.
  • the determination is made by comparing the threshold value of the ATP amount or the threshold value of BFR set in advance with the measurement data.
  • the actual plant uses the reverse osmosis membrane device 15 to continuously produce water except for the maintenance period.
  • the evaluation starts from a specific time (for example, 10 o'clock) within one day operation (S10).
  • a specific time for example, 10 o'clock
  • S10 one day operation
  • FIG. 10 is a flowchart of evaluation. As shown in FIG. 10, it is determined whether or not the first measurement data exceeds the threshold in advance by comparing with the threshold for the ATP amount and the threshold for BFR (S11). When the threshold value is not exceeded (No), it is determined that the reverse osmosis membrane 14 of the actual machine has no biofilm attached and is in a healthy operating state. Then, after the next 2 hours, the second measurement data is compared with the threshold of ATP amount or the threshold of BFR in advance to determine whether or not it exceeds the threshold (S12). If the threshold is not exceeded (No), the inspection for that day ends (S13). Note that the same evaluation operation is repeated at the same time on and after the next day.
  • the biofilm adhesion prevention measures are taken (S20).
  • a biofilm adhesion prevention measure a treatment for increasing the supply amount of the drug 31 from the drug supply unit 32 is performed. After a predetermined time has elapsed after this drug increase, evaluation after the drug mode change is started (S21).
  • This evaluation is the first re-evaluation after 2 hours from the start of the re-evaluation (S22).
  • S22 when the threshold value is exceeded (Yes), it is determined that the measures for preventing the biofilm from adhering to the reverse osmosis membrane 14 of the actual machine are not good, and another measure (change of the type of drug) Etc.).
  • the threshold value when the threshold value is not exceeded (No), it is determined that the reverse osmosis membrane 14 of the actual machine has no biofilm attached and is in a healthy operating state.
  • the measurement data of the second time is compared with the threshold value of the ATP amount or the threshold value of BFR in advance, and it is determined whether or not it exceeds the threshold value (S23).
  • S23 when the threshold value is not exceeded (No), the inspection for that day ends (S24). Repeat the same evaluation operation at the same time on the next day.
  • the first evaluation (S11) and the second evaluation (S23) after the medicine mode (S20) are described as cases where the threshold is not exceeded (No). If it exceeds (Yes), the medicine mode (S20) may be performed.
  • the operator can visually check the inspection data and change the operation mode.
  • the operation data is processed by the control device and the operation mode is changed by automatic control. Good.
  • FIG. 11 is a schematic diagram of a reverse osmosis membrane plant according to a third embodiment.
  • the reverse osmosis membrane plant 100 ⁇ / b> C according to the present embodiment includes, as the pretreatment unit 41 illustrated in FIG.
  • a first pretreatment unit 41 ⁇ / b> A that is a sand filtration unit in the influent water line L 1
  • a second pretreatment unit 41B which is a UF (or MF) membrane treatment unit, is installed on the downstream side of the first pretreatment unit 41A.
  • the inflow water line L 1 between the first pretreatment unit 41A and the second pretreatment unit 41B is connected to the inflow water line L 1 downstream of the second pretreatment unit 41B.
  • a bypass line L 4 that bypasses the processing unit 41B is provided.
  • a part of the sand filtration treated water subjected to the sand filtration of the first pretreatment unit 41A from a portion between the first pretreatment unit 41A and the second pretreatment unit 41B is used as the inspection water 21-1 and the branch line L 11.
  • the biofilm is attached to the test carrier 23 in the test container 22-1.
  • the evaluation biofilm is inspected in the inspection container 22-1 every predetermined time (or a predetermined number of times), and the inspection water 21-1 partially branched from the sand filtrate is evaluated.
  • pretreatment in the second pretreatment unit 41B of the UF (or MF) membrane treatment unit is unnecessary. to decide.
  • the flow channel switching valve 42 switches the second pre-processing Bypass to the downstream side of the portion 41B.
  • the biofilm installed between the second pretreatment unit 41B and the reverse osmosis membrane device 15 is evaluated at least once a day using the test container 22-2. This evaluation is performed by branching a part of the inflow water by the sand filtrate after bypassing the second pretreatment part 41B as the inspection water 21-2. As a result of the evaluation of the test water 21-2 using the sand filtrate as the influent water 11, when it is determined that there is no biofilm attached to the test water 21-2, the bypass of the second pretreatment unit 41B is continued. to decide.
  • the second pretreatment unit 41B of the UF (or MF) membrane treatment unit It is determined that the processing in is necessary. And in order to perform the pre-processing in the second pre-processing section 41B, it switches the channel switching valve 42 to stop the bypass of the bypass line L 4, passed through a sand filter water to the second pre-processing section 41B Then, pre-processing is performed. Thereafter, evaluation is performed and the same judgment is made.
  • the biofilm adhesion factor of the raw water 40 is very small.
  • a material having higher biofilm adhesion than a reverse osmosis membrane used in an actual machine is used.
  • the presence or absence of the biofilm can be confirmed at a predetermined time or a predetermined number of days less than one day.
  • the first preprocessing unit 41A and the second preprocessing unit 41B are different types of preprocessing devices, but the present invention is not limited to this, and the first preprocessing unit 41A and The same type of pre-processing apparatus may be used for the second pre-processing unit 41B.
  • the first pretreatment unit 41A may be a front-stage sand filtration unit
  • the second pretreatment unit 41B may be a two-stage process of the rear-stage sand filtration unit.
  • the flow path switching valve 42 is switched so that the sand filtered water flows into the bypass line L 4 to be bypassed to the downstream side of the second pretreatment unit 41B. Thereby, reduction of the running cost by bypassing the 2nd pre-processing part 41B can be aimed at.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Nanotechnology (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)

Abstract

L'invention concerne une installation à membrane d'osmose inverse comprenant : un dispositif à membrane d'osmose inverse (15) auquel une ligne d'eau d'entrée L1 pour introduire de l'eau entrante (11) est connectée et qui a une membrane d'osmose inverse (14) pour produire de l'eau de perméation (12) obtenue par élimination d'un sel de l'eau entrante (11) et de l'eau concentrée (13) dans laquelle le sel contenu dans l'eau entrante (11) est concentré; une ligne de ramification L11 qui se ramifie à partir de la ligne d'entrée L1 et qui dévie une partie de l'eau entrante (11) en tant qu'eau d'inspection (21); un récipient d'inspection auquel la ligne de ramification L11 est reliée et qui amène l'eau d'inspection (21) à passer à travers; au moins un support d'inspection (23) qui est reçu dans le récipient d'inspection (22), auquel adhère un biofilm issu de l'eau d'inspection (21), et qui est fait d'un matériau ayant une adhésivité au biofilm supérieure à celle du matériau de la membrane d'osmose inverse (14); et un dispositif d'inspection de biofilm qui arrête le passage de l'eau d'inspection (21) vers le récipient d'inspection (22) et qui inspecte la quantité de biofilm collée au support d'inspection (23).
PCT/JP2017/016612 2017-04-26 2017-04-26 Installation à membrane d'osmose inverse et procédé de fonctionnement d'une installation à membrane d'osmose inverse Ceased WO2018198245A1 (fr)

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PCT/JP2017/016612 WO2018198245A1 (fr) 2017-04-26 2017-04-26 Installation à membrane d'osmose inverse et procédé de fonctionnement d'une installation à membrane d'osmose inverse
JP2019514534A JPWO2018199093A1 (ja) 2017-04-26 2018-04-24 逆浸透膜プラント及び逆浸透膜プラントの運転方法
PCT/JP2018/016614 WO2018199093A1 (fr) 2017-04-26 2018-04-24 Installation à membrane à osmose inverse et procédé de fonctionnement de installation à membrane à osmose inverse

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Citations (6)

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