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WO2018199093A1 - Installation à membrane à osmose inverse et procédé de fonctionnement de installation à membrane à osmose inverse - Google Patents

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

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Publication number
WO2018199093A1
WO2018199093A1 PCT/JP2018/016614 JP2018016614W WO2018199093A1 WO 2018199093 A1 WO2018199093 A1 WO 2018199093A1 JP 2018016614 W JP2018016614 W JP 2018016614W WO 2018199093 A1 WO2018199093 A1 WO 2018199093A1
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Prior art keywords
water
reverse osmosis
osmosis membrane
biofilm
test
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PCT/JP2018/016614
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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
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Mitsubishi Heavy Industries Engineering Ltd
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Priority to JP2019514534A priority Critical patent/JPWO2018199093A1/ja
Publication of WO2018199093A1 publication Critical patent/WO2018199093A1/fr
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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.
  • a reverse osmosis membrane is obtained in which an inflow water line for inflowing inflow water is connected to obtain permeated water from which salt content has been removed from the inflow water and concentrated water in which salt content in the inflow water is concentrated.
  • a reverse osmosis membrane device, a branch line branched from the inflow water line or a concentrated water discharge line for discharging the concentrated water, and branching the inflow water or a part of the concentrated water as test water, and the branch line Is connected, and at least one or more test containers are stored in the test container, and a biofilm derived from the test water adheres to the test container.
  • a test carrier made of a material having high biofilm adhesion, and a biofilm test for stopping the flow of the test water to the test container and inspecting the amount of biofilm attached to the test carrier In the reverse osmosis membrane plant, characterized by comprising devices and, a.
  • a reverse osmosis membrane step of separating a permeated water from which inflow water has been salinized and a concentrated water in which the salinity in the inflow water has been concentrated is separated, and the inflow water or A part of the concentrated water is branched as test water, and a test water flow process for passing the test water into the test container; at least one of the concentrated water is stored in the test container;
  • the biofilm adhesion amount measuring step for measuring the biofilm adhesion amount adhering to the test carrier and the biofilm adhesion amount measuring step a predetermined time or predetermined times less than one day from the beginning of water flow
  • a biofilm adhered evaluation step for evaluating the deposition amount of biofilm, and based on the evaluation, in an operating method of the reverse
  • a reverse osmosis membrane device having a pretreatment unit for pretreatment of inflow water, a reverse osmosis membrane for obtaining permeate and concentrated water from the pretreated inflow water,
  • a water quality evaluation unit that evaluates the quality of the influent water supplied to the reverse osmosis membrane device, and the water quality evaluation unit includes an SDI value measurement unit that obtains an SDI value of the inflow water, and the inflow water or the Using a part of concentrated water, the biofilm derived from the test water adheres, and the biofilm adhesion evaluation value to the test carrier made of a material having higher biofilm adhesion than the reverse osmosis membrane material is obtained.
  • a reverse osmosis membrane comprising: a biofilm adhesion evaluation section; and a pretreatment condition adjustment section that adjusts the pretreatment conditions from the evaluation results of the SDI value and the biofilm adhesion evaluation value. In the plant.
  • a pretreatment step of pretreating influent water a reverse osmosis membrane step having a reverse osmosis membrane for obtaining permeated water and concentrated water from the pretreated inflow water
  • a water quality evaluation step for evaluating the quality of the influent water supplied to the reverse osmosis membrane device wherein the water quality evaluation step includes an SDI value measurement step for obtaining an SDI value of the inflow water, and the inflow water or Using a part of the concentrated water, the biofilm derived from the test water adheres, and the biofilm adhesion evaluation value to the test carrier made of a material having higher biofilm adhesion than the material of the reverse osmosis membrane
  • a reverse osmosis membrane comprising: a biofilm adhesion evaluation step to be obtained; and a pretreatment condition adjustment step of adjusting pretreatment conditions from the evaluation results of the SDI value and the biofilm adhesion evaluation value plant In the operating 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. 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
  • FIG. 9 is a schematic diagram of a reverse osmosis membrane plant according to the second embodiment.
  • FIG. 10 is a flowchart of evaluation according to the second embodiment.
  • FIG. 11 is a schematic diagram of a reverse osmosis membrane plant according to a third embodiment.
  • FIG. 12 is a schematic diagram of a reverse osmosis membrane plant according to a fourth embodiment.
  • FIG. 13 is a schematic diagram of another reverse osmosis membrane plant according to the fourth embodiment.
  • FIG. 14 is a schematic diagram of a reverse osmosis membrane plant according to a fifth embodiment.
  • FIG. 15 is a flowchart of evaluation according to the fifth embodiment.
  • 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.
  • the 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. Detect film adhesion And a biofilm inspection device to be inspected.
  • the medicine supply line L 21 is connected to the inflow water line L 1 , and the medicine 31 is supplied from the medicine supply unit 32 as necessary.
  • UF membrane ultrafiltration membrane
  • MF membrane microfiltration membrane
  • 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 permeated water 12 desalted by the reverse osmosis membrane device 15 is discharged by the permeated water discharge line L 2, and the concentrated water 13 having a concentrated salt content is discharged by the concentrated water discharge line L 3 .
  • 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 the present invention is not limited at all.
  • 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 preferably equal to the linear velocity of the inflowing water 11 flowing in the membrane surface of the reverse osmosis membrane 14 installed in the actual reverse osmosis membrane device 15. 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.
  • a plurality of inspection carriers 23 may be accommodated in the inspection container 22. And you may make it take out the test
  • the plurality of test carriers 23 are not limited to cylindrical ones.
  • a flexible film-like material may be rounded and stored in the inspection container 22.
  • 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. Since this biofilm is highly adhesive, it is used every predetermined time (for example, 1, 2, 3 hours) less than one day from the beginning (0 hours) of the test water 21 to be started or a predetermined number of times ( It is possible to evaluate the amount of biofilm attached to the test carrier 23 at least once every 1 to 6 hours.
  • 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.
  • a few hours for example, 2 to 8 hours
  • the trend of adhesion of the reverse osmosis membrane device 15 of the actual plant to the reverse osmosis membrane 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 first to fourth 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 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 body and mixed with the reagent. Subsequently, 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.
  • Table 1 below 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 test carrier 23 in the test container 22.
  • the number of inspection carriers 23 in the inspection container 22 may be one or plural. Here, 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.
  • FIG. 10 is a flowchart of evaluation according to the second embodiment.
  • the evaluation starts from a specific time (for example, 10 o'clock) within one day operation (S10).
  • S10 one day operation
  • the evaluation is performed every 2 hours, the first evaluation is performed at 12:00 after 2 hours.
  • the first measurement data exceeds a threshold value by comparing with an evaluation value such as a preset threshold value of ATP amount or a BFR threshold value (S ⁇ b> 11).
  • an evaluation value such as a preset threshold value of ATP amount or a BFR threshold value (S ⁇ b> 11).
  • the threshold value is not exceeded (No)
  • the second measurement data is compared with a preset evaluation value such as an ATP amount threshold value or a BFR threshold value, and it is determined whether or not the threshold value is exceeded (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.
  • biofilm adhesion prevention measures drug mode
  • drug mode biofilm adhesion prevention measures
  • 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 biofilm adhesion prevention measure is not good on the actual reverse osmosis membrane 14, and another measure (concentration increase in drug, Or change the type).
  • 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. It is determined whether or not the second measurement data exceeds a threshold value by comparing with an evaluation value such as a preset threshold value of ATP amount or a BFR threshold value (S23). In the evaluation of this step 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.
  • an evaluation value such as a preset threshold value of ATP amount or a BFR threshold value
  • 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.
  • FIG. 12 is a schematic diagram of a reverse osmosis membrane plant according to a fourth embodiment.
  • the reverse osmosis membrane plant 100 ⁇ / b> D according to the present embodiment is branched from the concentrated water discharge line L 3 that discharges the concentrated water 13 from the reverse osmosis membrane device 15, and a part of the concentrated water 13 is inspected.
  • a branch line L 13 branched as the water 21 and a test container 22 through which the test water 21 is passed are connected to the branch line L 13 .
  • it is preferable that the water flow of the test water 21 is equivalent to the linear velocity of the concentrated water discharge.
  • Example 1 biofouling of influent water 11 was evaluated, but in this example, biofouling of concentrated water 13 was evaluated. This is because, as biofouling occurs, the more bacteria grow on the membrane surface of the reverse osmosis membrane 14, the more bacteria that are detached from the membrane surface and outflow into the concentrated water 13.
  • the biofouling in the concentrated water is evaluated by operating in the same manner as in Example 1 so that the measurement sensitivity is higher than the measurement of biofouling in the influent water. It is thought to improve.
  • FIG. 13 is a schematic diagram of another reverse osmosis membrane plant according to the fourth embodiment.
  • the reverse osmosis membrane plant 100E according to the present embodiment is branched from the inlet water line L 1, a branch line L 11 that branches a part of the influent water 11 as the test water 21, branch line L 11 is connected and branched from a test container 22 through which the test water 21 is passed and a concentrated water discharge line L 3 for discharging the concentrated water 13, and a part of the concentrated water 13 is branched as the test water 21.
  • a branch line L 13 branch line L 13 is connected, and a testing container 22 that passed through the test water 21 therein, a.
  • the amount of biofilm attached to either one or both of the influent water 11 and the concentrated water 13 can be measured. Then, by comparing and evaluating the amount of biofilm attached to the inflow water 11 on the inlet side of the reverse osmosis membrane device 15 and the amount of biofilm attached to the concentrated water 13 on the outlet side, Measures can be taken. For example, even when the evaluation of the amount of biofilm deposited on the inflow water 11 side is severe, exceeding the threshold, if the amount of biofilm deposited on the concentrated water 13 side is close to the steady state below the threshold, reverse osmosis The permeated water 12 may be continuously obtained without changing the operation mode of the membrane device.
  • the operation mode may be changed to perform an operation to take measures against biofouling.
  • the operation with higher accuracy than the case of only the operation based on the evaluation of the amount of biofilm deposited on the influent water 11 side is performed. It can be carried out. This is because when the amount of biofilm deposited on the concentrated water 13 is taken into account, a phenomenon in which biological activity becomes active inside the reverse osmosis membrane 14 and the amount of biofilm formation increases can be further detected.
  • FIG. 14 is a schematic diagram of a reverse osmosis membrane plant according to Example 5.
  • the reverse osmosis membrane plant 100E according to the present embodiment includes a pretreatment unit (for example, a filtration unit and a chemical supply unit) 60 that pretreats the inflow water 11 and the inflow water that has been pretreated.
  • a pretreatment unit for example, a filtration unit and a chemical supply unit
  • the water quality evaluation unit 70 uses a part of the inflow water 11 as the inspection water 71 and obtains an SDI value, and a part of the inflow water 11 as the inspection water 71, and the biofilm derived from the inspection water adheres to it.
  • the biofilm adhesion evaluation unit 73 for obtaining the adhesion evaluation amount to the test carrier 23 made of a material having higher biofilm adhesion than the reverse osmosis membrane material, the SDI value and the biofilm adhesion evaluation value (BFR value) and From the evaluation results, it comprises a preprocessing condition adjusting unit 74 for adjusting the pretreatment conditions of the pre-processing unit 60.
  • the measurement of the SDI value in the present embodiment can be performed, for example, under the conditions specified in ASTM (Standard Test Method for Silent Density Index of Water D4189-95), and can be performed by the following calculation formula.
  • SDI value (1 ⁇ T0 / T15) ⁇ 100/15
  • T0 Time required to filter 500 ml of the initial sample through a membrane filter having a pore diameter of 0.45 ⁇ m and a diameter of 47 mm at a pressure of 206 kPa (seconds)
  • T15 Further filtration for 15 minutes, and then the sample Time required to filter 500 ml (seconds)
  • the measurement of the BFR value in this example was performed in the same manner as in the case of using the test carrier 23 made of a material having higher biofilm adhesion than the material of the reverse osmosis membrane of Example 1.
  • the SDI value can be evaluated in about 1 hour.
  • a predetermined time for example, 1, 2 or less
  • the initial stage (0 hours) when the test water 71 starts to flow. 3 hours
  • a predetermined number of times at least once every 1 to 6 hours
  • FIG. 15 is a flowchart of evaluation according to the fifth embodiment.
  • fresh water is generated by normal operation (S30).
  • the SDI value and the BFR value are measured after a predetermined time has elapsed within one day of operation time (S31). It is determined whether the SDI value and the BFR value exceed a threshold value (S32). If none of the values exceed the threshold (No), it is determined that there is no turbidity in the influent water 11 and the actual reverse osmosis membrane 14 has no biofilm attached and is in a healthy operating state.
  • the SDI value and the BFR value are measured again after a predetermined time (S31).
  • the pretreatment condition adjustment unit 74 executes countermeasure I for removing the turbidity of the influent water 11 (S33).
  • the pretreatment condition adjustment unit 74 takes measures II for preventing biofilm adhesion (S34).
  • the measure I (S33) for removing turbidity for example, in the case of a plant with no chemical injection processing, as a pretreatment unit, the turbidity treatment in which a part of the filtrate is circulated and the number of turbidity treatments are set.
  • the operation to increase can be illustrated.
  • operation which throws in a turbid content for example by throwing a flocculant into can be illustrated.
  • the biofilm adhesion prevention measure II (S34) it is the same as that described in the first embodiment. For example, it is possible to exemplify performing a treatment to increase the supply amount of the biofouling prevention drug. . When both values exceed the threshold value, both evaluations are comparatively weighed, and one or both of measures I and II are executed.
  • the SDI value after the measure is taken and the BFR value are measured (S35). Thereafter, it is determined again whether the SDI value and the BFR value exceed the threshold values (S36).
  • measures I and II such as pretreatment and sterilization treatment can be taken according to the SDI value in the inflowing water by SDI measurement and the degree of adhesion of the biofilm of the BFR value.
  • the RO membrane plant can be operated stably.
  • stable water treatment can be performed by performing the water quality evaluation of the influent water 11 and the biofouling of the reverse osmosis membrane surface with higher accuracy using the SDI value and the BFR value as an index. It becomes.
  • SDI measurement and BFR value measurement are preferably performed using test water 71 from separate branch lines L 11 and L 12 as shown in FIG. 15 to prevent data interference.
  • the SDI value measuring unit 72 and the biofilm adhesion evaluating unit 73 may be installed in series on the branch line L11. In this case, for example, it is preferable to measure the SDI value after measuring the BFR value. As a result, the measuring device can be simplified with only one line of the inspection water 71, and the amount of inspection water can be reduced.
  • the BFR value is evaluated by biofouling using the test carrier 23 made of a material having higher biofilm adhesion than the material of the reverse osmosis membrane in Example 1.
  • the test carrier 23 made of a material having higher biofilm adhesion than the material of the reverse osmosis membrane in Example 1.
  • it is not limited to this.

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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

La présente invention est équipée: d'un dispositif à membrane d'osmose inverse (15) auquel est raccordée une ligne d'eau d'entrée L1 dans laquelle s'écoule de l'eau d'entrée (11), le dispositif à membrane d'osmose inverse (15) ayant une membrane d'osmose inverse (14) pour obtenir de l'eau de perméation (12) dans laquelle une matière saline a été retirée de l'eau d'entrée (11), et de l'eau concentrée (13) dans laquelle la matière saline dans l'eau d'entrée (11) est concentrée; une ligne de ramification L11 qui est dérivée de la ligne d'eau d'entrée L1 et qui dérive une partie de l'eau d'entrée (11) comme eau d'inspection (21); un récipient d'inspection auquel est reliée la ligne de ramification L11, l'eau d'inspection (21) passant à travers l'intérieur du récipient d'inspection (22); un support d'inspection (23) dont au moins un est logé à l'intérieur du récipient d'inspection (22) et auquel adhère un biofilm issu de l'eau d'inspection (21), le support d'inspection (23) comprenant un matériau ayant une plus grande adhérence avec le biofilm que le matériau constituant la membrane d'osmose inverse (14); et un dispositif d'inspection de biofilm qui arrête l'écoulement d'eau d'inspection (21) vers le récipient d'inspection (22) et inspecte la quantité d'adhérence du biofilm qui a adhéré au support d'inspection (23).
PCT/JP2018/016614 2017-04-26 2018-04-24 Installation à membrane à osmose inverse et procédé de fonctionnement de installation à membrane à osmose inverse Ceased WO2018199093A1 (fr)

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JP2015009174A (ja) * 2013-06-27 2015-01-19 株式会社日立製作所 水処理システムおよび水処理システムの水処理方法
JP2015134327A (ja) * 2014-01-17 2015-07-27 株式会社日立製作所 分離膜面評価方法、水処理システムの制御方法、および水処理システム

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JPH11153558A (ja) * 1997-11-19 1999-06-08 Kurita Water Ind Ltd スライム又はスケール付着検知装置
WO2008038575A1 (fr) * 2006-09-25 2008-04-03 Toray Industries, Inc. PROCÉDÉ DE FONCTIONNEMENT D'Une installation DE FILTRATION suR MEMBRANE D'OSMOSE INVERSE, ET installation DE FILTRATION sur MEMBRANE D'OSMOSE INVERSE
JP2008107330A (ja) * 2006-09-25 2008-05-08 Toray Ind Inc バイオファウリング発生リスク評価装置
JP2011255301A (ja) * 2010-06-08 2011-12-22 Japan Organo Co Ltd 分離膜の汚染評価方法、これを利用した分離膜運転管理方法及びろ過装置
WO2013129111A1 (fr) * 2012-02-29 2013-09-06 東レ株式会社 Procédé de production d'eau
JP2014211327A (ja) * 2013-04-17 2014-11-13 栗田工業株式会社 水系のスライム付着状況のモニタリング方法及びモニタリング装置
JP2015009174A (ja) * 2013-06-27 2015-01-19 株式会社日立製作所 水処理システムおよび水処理システムの水処理方法
JP2015134327A (ja) * 2014-01-17 2015-07-27 株式会社日立製作所 分離膜面評価方法、水処理システムの制御方法、および水処理システム

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2022141400A (ja) * 2021-03-15 2022-09-29 ダイセン・メンブレン・システムズ株式会社 Ｆｉ測定ユニット、ｆｉ測定プログラム、ｆｉ測定プログラムを記録した記録媒体、ｆｉ情報システム、及び、ｆｉデータベースの構築方法
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