WO2020059477A1 - Dispositif et procédé de traitement par osmose inverse - Google Patents

Dispositif et procédé de traitement par osmose inverse Download PDF

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Publication number
WO2020059477A1
WO2020059477A1 PCT/JP2019/034531 JP2019034531W WO2020059477A1 WO 2020059477 A1 WO2020059477 A1 WO 2020059477A1 JP 2019034531 W JP2019034531 W JP 2019034531W WO 2020059477 A1 WO2020059477 A1 WO 2020059477A1
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Prior art keywords
reverse osmosis
water
osmosis membrane
chlorine
membrane module
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PCT/JP2019/034531
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English (en)
Japanese (ja)
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浩樹 宮川
康司 福▲崎▼
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株式会社日立製作所
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    • 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
    • B01D61/08—Apparatus therefor
    • 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
    • B01D61/58—Multistep processes
    • 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
    • B01D65/02—Membrane cleaning or sterilisation ; Membrane regeneration
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/50—Treatment of water, waste water, or sewage by addition or application of a germicide or by oligodynamic treatment
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C02F1/76—Treatment of water, waste water, or sewage by oxidation with halogens or compounds of halogens

Definitions

  • the present invention relates to a reverse osmosis treatment device and a reverse osmosis treatment method for desalinating brine such as seawater by reverse osmosis to produce desalinated water.
  • Reverse osmosis treatment devices that desalinate brine by the principle of reverse osmosis are used in various fields such as desalination of seawater, reuse of wastewater, and production of pure water.
  • a device having a cylindrical reverse osmosis membrane module is generally used as the reverse osmosis treatment device.
  • the reverse osmosis treatment device is composed of a reverse osmosis membrane module bank in which a plurality of reverse osmosis membrane modules are connected in parallel, a reverse osmosis membrane unit in which a plurality of reverse osmosis membrane modules are connected in series, and the like. .
  • a cylindrical reverse osmosis membrane module contains a large number of reverse osmosis membrane elements inside a cylindrical pressure vessel.
  • the reverse osmosis membrane element has a structure in which a bag-like reverse osmosis membrane is spirally wound around a water collection pipe.
  • a plurality of reverse osmosis membrane elements are housed in a cylindrical pressure vessel arranged in series.
  • reverse osmosis treatment is performed by a cross-flow filtration method using a reverse osmosis membrane.
  • the desalted water permeates to the secondary side of the reverse osmosis membrane and is recovered as permeated water.
  • the salt remains on the primary side of the reverse osmosis membrane, and the concentrated water in which the salt is concentrated is discharged from the other end of the pressure vessel.
  • a two-pass reverse osmosis treatment device including a first pass for performing primary treatment on brine by reverse osmosis and a second pass for performing secondary treatment on permeated water separated in the first pass by reverse osmosis is known. ing.
  • the second pass concentrated water having a low TDS is returned to the first pass treated water having a high TDS (Total Dissolved Solid).
  • TDS Total Dissolved Solid
  • the reverse osmosis membrane built in the reverse osmosis membrane module causes fouling due to propagation of microorganisms.
  • a microorganism adheres and grows in a pipe or a reverse osmosis membrane, a biofilm is formed.
  • biofilm is deposited on the reverse osmosis membrane, the reverse osmosis membrane becomes clogged, increasing the operating pressure and deteriorating the membrane performance. And so on.
  • sodium hypochlorite is widely used as a disinfectant.
  • a free chlorine-based drug such as sodium hypochlorite degrades a general polyamide as a material for a reverse osmosis membrane and degrades the reverse osmosis membrane. Therefore, chloramine having bound chlorine has been frequently used for sterilization and cleaning of piping and reverse osmosis membrane modules.
  • a free chlorine-based chemical it is rendered harmless with a reducing agent before it reaches the reverse osmosis membrane after being injected into the water to be treated.
  • Patent Document 1 discloses a treatment method in which ammonium ions are added to water to be treated containing free chlorine. According to this treatment method, chloramine is generated by the reaction between free chlorine and ammonium ions.
  • Patent Document 2 discloses a fresh water producing method in which chloramine is added to water to be treated before being treated with a semipermeable membrane.
  • a chloramine is generated by separately adding a free chlorine-containing liquid and an ammonium salt to the water to be treated, or when the water to be treated is ammonia-containing water, only the free chlorine-containing liquid is added. (See paragraph 0017).
  • Chloramine is a drug that is less bactericidal than a free chlorine-based drug such as sodium hypochlorite, but is less likely to degrade polyamide, which is a common material for reverse osmosis membranes. Therefore, when the water to be treated to which chloramine is added is passed, the reverse osmosis membrane module and the piping can be sterilized and washed without greatly deteriorating the reverse osmosis membrane. Since chloramine does not need to be detoxified before reaching the reverse osmosis membrane, fouling of the reverse osmosis membrane can be prevented while continuing the reverse osmosis treatment.
  • chloramine may form bromoamine in the presence of bromide ion. Since bromoamine has a strong action of decomposing polyamide and the like, if the treatment water to which chloramine is added contains a high concentration of bromide ions, the degradation of the reverse osmosis membrane proceeds. Even when the TDS of the water to be treated is high and a component that generates a strong oxidizing agent such as bromide ion is contained at a high concentration, it can be sterilized and washed without impairing the membrane performance of the reverse osmosis membrane. Technology is required.
  • chloramine has a problem in storage until drug injection. Chloramine at a high concentration is chemically unstable and has a reduced bactericidal activity during storage, so it is necessary to store it at a low concentration until drug injection. However, when chloramine required for sterilization and washing is prepared at a low concentration, a large-scale storage facility is required, and thus the use of chloramine is restricted.
  • the present invention provides a reverse osmosis treatment apparatus and a reverse osmosis treatment apparatus capable of suppressing reverse osmosis membrane fouling without significantly deteriorating the reverse osmosis membrane and stably performing reverse osmosis treatment of water to be treated having a high TDS. It is an object to provide a processing method.
  • a reverse osmosis treatment device comprises a first reverse osmosis membrane module bank for subjecting water to be treated to primary treatment by reverse osmosis to separate into first permeated water and first concentrated water, A second reverse osmosis membrane module bank for subjecting the first permeated water to secondary treatment by reverse osmosis to separate it into a second permeated water and a second concentrated water; and separating the second concentrated water into the first reverse osmosis membrane module bank.
  • a second concentrated water return pipe for returning to the primary side of the first or a second permeated water return pipe for returning the second permeated water to the first side of the first reverse osmosis membrane module bank;
  • the water return pipe or the second permeated water return pipe has at least one chemical dosing part for injecting a drug into the pipe.
  • a reverse osmosis membrane module bank for subjecting the water to be treated to reverse osmosis treatment to separate it into permeated water and concentrated water
  • a permeated water return pipe for returning the permeated water to the primary side of the reverse osmosis membrane module bank
  • the permeated water return pipe has one or more injection parts for injecting a drug into the pipe.
  • the water to be treated is firstly treated by reverse osmosis to be separated into a first permeate and a first concentrated water, and the first permeate is secondarily treated by reverse osmosis.
  • Reverse osmosis treatment in which the second concentrated water or the second permeated water is separated into a second concentrated water and a second concentrated water by the reverse osmosis treatment while returning the second concentrated water or the second concentrated water to the treated water.
  • the second concentrated water returned to the water to be treated, or the second permeated water returned to the water to be treated continuously or with a chlorine-based disinfectant or a precursor of a chlorine-based disinfectant. Inject intermittently.
  • FIG. 1 is a diagram showing a configuration of a reverse osmosis treatment device according to a first embodiment of the present invention.
  • the reverse osmosis treatment apparatus 1 includes a first reverse osmosis membrane module bank 10, a second reverse osmosis membrane module bank 20, a raw water pipe 110, and a first permeated water pipe. 120, a first concentrated water pipe 130, a second permeated water pipe 220, a second concentrated water return pipe 240, a drain pipe 280, a supply pump P1, and a high-pressure pump P2.
  • the reverse osmosis treatment device 1 is a two-pass reverse osmosis treatment device including a first pass for primary treatment of raw water and a second pass for secondary treatment of permeated water separated in the first pass.
  • the reverse osmosis treatment apparatus 1 when the raw water is subjected to the reverse osmosis treatment in the first pass constituted by the reverse osmosis membrane module, the permeated water in which ions are reduced is separated. The permeated water is further subjected to reverse osmosis treatment in a second pass constituted by a reverse osmosis membrane module, so that ions are further reduced.
  • raw water for example, seawater, brackish water (river water, lake water, groundwater, etc.), fossil water, associated water collected from oil fields, sewage, rainwater, domestic wastewater, industrial wastewater, etc. can be subjected to reverse osmosis treatment.
  • These raw waters are introduced into the reverse osmosis treatment device 1 after being subjected to a pretreatment such as a filtration treatment, a coagulation treatment, a sterilization treatment, and a biological treatment as necessary.
  • the first reverse osmosis membrane module bank 10 and the second reverse osmosis membrane module bank 20 each include one or a plurality of reverse osmosis membrane modules.
  • a plurality of reverse osmosis membrane modules constituting a reverse osmosis membrane module bank are connected via a pipe so as to be in a parallel relationship with each other.
  • the plurality of reverse osmosis membrane modules connected in parallel perform reverse osmosis treatment under the same operating conditions.
  • the reverse osmosis membrane module bank is provided as a processing unit, the amount of fresh water can be expanded within the allowable pressure range of the reverse osmosis membrane module.
  • the first reverse osmosis membrane module bank 10 and the second reverse osmosis membrane module bank 20 can also constitute a reverse osmosis membrane unit by combining a plurality of reverse osmosis membrane module banks.
  • the plurality of reverse osmosis membrane units can be connected to each other on a drainage side of the permeated water or a drainage side of the concentrated water of an arbitrary reverse osmosis membrane module bank via a pipe so as to have a serial relationship with each other.
  • the reverse osmosis membrane unit is provided as a processing unit, desalinated water can be produced at a higher recovery rate within the allowable pressure range of the reverse osmosis membrane module.
  • FIG. 2 is a cross-sectional view illustrating an example of the structure of the reverse osmosis membrane module.
  • the reverse osmosis membrane module M includes a pressure vessel 5 and a reverse osmosis membrane element 6.
  • the pressure vessel 5 is a vessel having a substantially cylindrical shape, and has an inlet port 5a at one end and an outlet port 5b at the other end.
  • a reverse osmosis membrane element 6 is housed inside the pressure vessel 5.
  • the reverse osmosis membrane element 6 includes a reverse osmosis membrane 7 and is arranged inside the pressure vessel 5 in series.
  • a total of five reverse osmosis membrane elements 6 are arranged, but the number of the reverse osmosis membrane elements 6 may be appropriately determined according to the specifications of the reverse osmosis membrane module, the conditions of the reverse osmosis treatment, and the like. It can be a number.
  • FIG. 3 is a perspective view showing an example of the structure of the reverse osmosis membrane element.
  • the reverse osmosis membrane element 6 has a structure in which a membrane laminate 6 a on which a reverse osmosis membrane 7 is stacked is arranged around a water collection pipe 8.
  • a plurality of bag-shaped reverse osmosis membranes 7 and a mesh-shaped spacer 9 are radially joined to the peripheral surface of the water collecting pipe 8, and are spirally wound around the water collecting pipe 8. Turned and formed.
  • the reverse osmosis membrane 7 is joined at a position where the inside of the bag communicates with the through hole 8 a of the water collecting 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 membranes.
  • the reverse osmosis membrane element 6 is housed in the pressure vessel 5 so that the water collection pipe 8 is oriented along the longitudinal direction of the pressure vessel 5.
  • the water collection pipes 8 of each reverse osmosis membrane element 6 are connected in series with each other to form one pipe with open ends.
  • the end of the water collecting pipe 8 is drawn out from the end of the pressure vessel 5 provided with the outlet port 5b, and is connected to a pipe for collecting permeated water.
  • Water to be treated pressurized to a pressure exceeding the osmotic pressure is introduced into the reverse osmosis membrane module M through the introduction port 5a. Then, while the water to be treated flows along the longitudinal direction of the pressure vessel 5, the reverse osmosis treatment is performed by the reverse osmosis membrane 7 by a cross-flow filtration method. As the reverse osmosis proceeds, the water from which the ions have been removed moves to the secondary side of the reverse osmosis membrane 7, and the ions remain on the primary side of the reverse osmosis membrane 7. The concentrated water on the primary side in which the ions are concentrated is discharged from the pressure vessel 5 through the outlet port 5b. On the other hand, the permeated water on the secondary side from which ions have been removed is collected inside the water collecting pipe 8 and discharged from the terminal.
  • the first reverse osmosis membrane module bank 10 and the second reverse osmosis membrane module bank 20 are configured such that the recovery rate of permeated water is gradually increased.
  • Reverse osmosis treatment of water to be treated under appropriate operating conditions In the first reverse osmosis membrane module bank 10, raw water is separated into first permeated water and first concentrated water. Further, in the second reverse osmosis membrane module bank 20, the first permeated water separated in the first reverse osmosis membrane module bank 10 is separated into a second permeated water and a second concentrated water.
  • each of the first reverse osmosis membrane module bank 10 and the second reverse osmosis membrane module bank 20 may be constituted by the same number of reverse osmosis membrane modules, or may be constituted by different numbers of reverse osmosis membrane modules. It may be configured.
  • the reverse osmosis membrane 7 incorporated in each reverse osmosis membrane module may be any of a reverse osmosis (Reverse Osmosis: RO) membrane and a nanofiltration (Nanofiltration: NF) membrane.
  • the first reverse osmosis membrane module bank 10 is connected with a raw water pipe 110, a first permeated water pipe 120, and a first concentrated water pipe 130.
  • the other end of the first permeated water pipe 120 is connected to the second reverse osmosis membrane module bank 20.
  • the raw water pipe 110 is a pipe for flowing raw water from a raw water supply source such as a raw water tank to the first reverse osmosis membrane module bank 10.
  • the first permeated water pipe 120 is a pipe for flowing the first permeated water from the first reverse osmosis membrane module bank 10 to the second reverse osmosis membrane module bank 20.
  • the first concentrated water pipe 130 is a pipe for flowing the first concentrated water from the first reverse osmosis membrane module bank 10 to the outside of the system.
  • the raw water pipe 110 has a supply pump P1 for transferring raw water from a source of raw water toward the first reverse osmosis membrane module bank 10 and a pressure exceeding the osmotic pressure of the reverse osmosis membrane of the first reverse osmosis membrane module bank 10. And a high-pressure pump P2 for increasing the pressure of the raw water.
  • the first reverse osmosis membrane module bank 20 is connected to the first permeated water pipe 120, the second permeated water pipe 220, and the second concentrated water return pipe 240.
  • the other end of the second concentrated water return pipe 240 is connected downstream of the supply pump P1 of the raw water pipe 110 and upstream of the high pressure pump P2.
  • the second permeated water pipe 220 is a pipe through which the second permeated water flows from the second reverse osmosis membrane module bank 20 to the outside of the system.
  • the second concentrated water return pipe 240 is a pipe for flowing the second concentrated water from the second reverse osmosis membrane module bank 20 to the raw water pipe 110.
  • the second concentrated water return pipe 240 returns the second concentrated water to the primary side of the reverse osmosis membrane of the first reverse osmosis membrane module bank 10, dilutes the raw water, and necessitates the first reverse osmosis membrane module bank 10. Decrease reverse osmotic pressure.
  • the second concentrated water return pipe 240 is provided with one or more chemical injection parts (I, II) for injecting a chemical into the pipe.
  • the chemical injection section (I, II) of the second concentrated water return pipe 240 is used for sterilizing and cleaning the raw water pipe 110 and the first reverse osmosis membrane module bank 10.
  • a chlorine-based disinfectant or a precursor of the chlorine-based disinfectant is injected.
  • Each medicine injection section may be provided with a tube-integrated medicine injection device capable of injecting a medicine into a tube integrated with the device, connected between pipes, or a pipe capable of injecting a medicine into a pipe.
  • An injection-type chemical injection device may be connected to a branched pipe or a pipe having an injection port.
  • Examples of the chlorine-based disinfectant to be injected into the piping include a bound chlorine-based drug such as chloramine.
  • Chloramine is a relatively stable chlorine compound having a bound chlorine, and has a property of slowly generating free chlorine such as hypochlorous acid (HClO) and hypochlorite ion (ClO ⁇ ) in water.
  • free chlorine-based drugs such as sodium hypochlorite
  • chlorinated drugs such as chloramine have weaker bactericidal activity, but weaker action of decomposing polyamide, cellulose acetate, etc., which are common materials for reverse osmosis membranes It is a drug. Therefore, according to the combined chlorine-based agent such as chloramine, unlike the free chlorine-based agent, the reverse osmosis membrane module and the piping can be sterilized and washed without greatly deteriorating the reverse osmosis membrane.
  • the precursor of the chlorine-based germicide to be injected into the pipe is a substance that reacts in the pipe to generate a chlorine-based drug, and includes, for example, a precursor of a combined chlorine-based drug such as chloramine.
  • a precursor of a combined chlorine-based drug such as chloramine.
  • hypochlorous acids such as hypochlorous acid, sodium hypochlorite, potassium hypochlorite, and calcium hypochlorite can be used.
  • ammonium salts such as ammonium chloride and ammonium sulfate, aqueous ammonia and the like can be used.
  • hypochlorous acids generate chloramine by reaction with ammonium ions under alkaline conditions. Therefore, the method of injecting only hypochlorous acid in water with high ammonia concentration or the method of injecting both hypochlorous acid and ammonium salt, ammonia water, etc., as in the case of injecting chloramine itself
  • the reverse osmosis membrane module and piping can be sterilized and cleaned.
  • a chemical injection device (11, 12) is installed in the chemical injection section I of the first concentrated water return pipe 240 in order to inject a precursor of a chlorinated germicide such as ammonium salt, ammonia water, or the like. can do.
  • a precursor of a chlorinated germicide such as ammonium salt, ammonia water, or the like.
  • another injection apparatus 21, 22
  • These chemicals are prepared in the chemical tanks 11 and 21, respectively, and are continuously or intermittently injected by the chemical injection pumps 12 and 22 during the reverse osmosis treatment.
  • two chemical injection parts (I, II) are provided in the second concentrated water return pipe 240, and a precursor of a chlorine-based disinfectant is dispensed, and chlorine-based disinfection is performed in the pipe.
  • a precursor of a chlorine-based disinfectant is dispensed, and chlorine-based disinfection is performed in the pipe.
  • the chlorine-based disinfectant itself is dispensed, or when only hypochlorous acid is dispensed into water having a high ammonia concentration
  • one of the second concentrated water return pipes 240 is supplied.
  • One dosing section may be provided.
  • three or more dispensing sections may be provided according to the number of chlorine-based disinfectants or precursors of chlorine-based disinfectants used.
  • a line mixer 50 for stirring the injected water can be installed in the second concentrated water return pipe 240 downstream of the injection section (I, II). Further, a water quality sensor 60 for detecting free chlorine can be installed downstream of the line mixer 50.
  • the line mixer 50 for example, a static mixer, a turbo mixer, or the like can be used. According to the line mixer 50, when a chlorine-based disinfectant is generated in a pipe, the reaction of a precursor of the chlorine-based disinfectant can be promoted. Therefore, it is possible to prevent unreacted hypochlorous acids (free chlorine) from flowing into the first reverse osmosis membrane module bank 10 and deteriorating the reverse osmosis membrane.
  • a residual chlorine sensor capable of measuring a free chlorine concentration for example, a residual chlorine sensor capable of measuring a free chlorine concentration, an oxidation-reduction potential (Oxidation-Reduction-Potential: ORP) sensor, a colorimetric sensor using a diethyl paraphenylenediamine (DPD) method, or the like is used.
  • ORP oxidation-reduction potential
  • DPD diethyl paraphenylenediamine
  • a drain pipe 280 can be connected to the second concentrated water return pipe 240 downstream of the water quality sensor 60.
  • the drain pipe 280 is used for draining return water having free chlorine remaining out of the system.
  • a water stop valve V1 that can be opened and closed can be provided on the second concentrated water return pipe 240 side.
  • a water distribution valve V2 that can be opened and closed can be provided on the drain pipe 280 side.
  • the water to be treated is firstly treated by reverse osmosis in the first reverse osmosis membrane module bank 10 to be separated into first permeated water and first concentrated water,
  • the reverse osmosis membrane module bank 20 the first permeated water is secondarily treated by reverse osmosis to separate it into the second permeated water and the second concentrated water, and the second concentrated water is returned to the treated water while returning the treated water. Is subjected to reverse osmosis to produce fresh water as the second permeated water.
  • the operating conditions of the first reverse osmosis membrane module bank 10 and the second reverse osmosis membrane module bank 20, the recovery rate of permeated water, and the like are set as appropriate according to the quality of raw water, the specifications of the reverse osmosis membrane module, and the like.
  • the operating conditions of the reverse osmosis membrane module, the recovery rate of the permeated water, and the like can be adjusted by adjusting the flow rates of the permeated water and the concentrated water with a flow control valve (not shown).
  • the second concentrated water return pipe 240 is supplied to the chemical injection section (I, II). , A chlorine-based disinfectant or a precursor of the chlorine-based disinfectant is injected.
  • the second concentrated water returned to the first reverse osmosis membrane module bank 10 is infused with a chlorine-based disinfectant or a precursor of the chlorine-based disinfectant, and the water containing the chlorine-based disinfectant dissolved therein is allowed to flow therethrough. 1
  • the reverse osmosis membrane module of the reverse osmosis membrane module bank 10 and the raw water piping 110 are sterilized and washed.
  • a chlorine-based disinfectant such as chloramine or a precursor of a chlorine-based disinfectant such as chloramine is used. Is injected into the water to be treated (raw water) supplied to the first pass.
  • water containing a chlorine-based disinfectant or a precursor of a chlorine-based disinfectant contains a high concentration of bromide ions or iodide ions, a large amount of these ions and chlorine-based disinfectants coexist.
  • strong oxidizing agent may be generated.
  • chloramine produces bromoamine in the presence of bromide ion, depending on the pH.
  • Bromoamine has a strong oxidizing power and a bactericidal effect, but also has a strong effect of decomposing polyamide, cellulose acetate, etc., which are generally used as a material for a reverse osmosis membrane, and deteriorates a generally used reverse osmosis membrane.
  • the raw water when the raw water is high TDS water such as seawater, it often contains high concentration of bromide ion or iodide ion. Since the amount of bromoamine and the like produced (reaction rate of the production reaction) depends on the concentration of the reactants (chloramine, bromide ion, and the like), the raw water supplied to the first pass is in a state where bromoamine and the like are easily produced.
  • a high concentration of a chlorine-based disinfectant or a precursor of a chlorine-based disinfectant is injected into raw water having a high TDS, a strong oxidizing agent such as bromoamine becomes highly concentrated in the first pass, and deterioration of the reverse osmosis membrane proceeds. .
  • the chlorine-based disinfectant or the precursor of the chlorine-based disinfectant is injected into the chemical injection section (I, II) of the second concentrated water return pipe 240 as in the reverse osmosis treatment device 1, the second concentrated Since the bromide ion concentration or iodide ion concentration of the water is lower than the water to be treated (raw water) supplied to the first reverse osmosis membrane module bank 10, a strong oxidizing agent such as bromoamine which deteriorates the reverse osmosis membrane is generated. It becomes difficult. Therefore, sterilization and cleaning of the reverse osmosis membrane module and the piping can be performed without significantly deteriorating the reverse osmosis membrane of the first reverse osmosis membrane module bank 10.
  • the chemical injection of the chlorine-based disinfectant or the precursor of the chlorine-based disinfectant may be performed continuously in the fresh water or intermittently in the fresh water.
  • the injection amount of the chlorine-based disinfectant or the precursor of the chlorine-based disinfectant may be controlled to a fixed amount injection for injecting a fixed amount per predetermined time, or according to the concentration of the chlorine-based disinfectant at an arbitrary measurement position. May be variably controlled.
  • As the measurement position for example, an inlet for treated water of the first reverse osmosis membrane module bank 10, a concentrated water outlet of the first reverse osmosis membrane module bank 10, and the like are exemplified.
  • the concentration of the chlorine-based disinfectant is determined, for example, by measuring the free chlorine concentration and the total chlorine concentration to determine the combined chlorine concentration, a residual chlorine sensor, an oxidation-reduction potential (ORP) sensor, and a ratio using a diethylparaphenylenediamine (DPD) method. It can be measured by a color sensor or the like.
  • These sensors can be installed, for example, at the inlet of the treated water of the first reverse osmosis membrane module bank 10 or at the concentrated water outlet of the first reverse osmosis membrane module bank 10.
  • the injection amount of the chlorine-based disinfectant or the precursor of the chlorine-based disinfectant is determined by the concentration of the chlorine-based disinfectant at the inlet of the treated water of the first reverse osmosis membrane module bank 10 or the concentration of the first reverse osmosis membrane module bank 10 It is preferable to control the concentration of the chlorine-based germicide at the water outlet so as to be maintained within a predetermined range. For example, when chloramine is used as a chlorine-based disinfectant, the injection amount can maintain the concentration of chloramine at about 1 to 3 ppm at each of these positions.
  • the concentration at the inlet of the water to be treated of the first reverse osmosis membrane module bank 10 When the concentration at the inlet of the water to be treated of the first reverse osmosis membrane module bank 10 is maintained, an excess chlorine-based germicide is removed from the first reverse osmosis membrane module while securing an effective concentration of chlorinated germicide necessary for sterilization and cleaning. The flow into the bank 10 can be prevented. Since the concentration of the chlorine-based germicide reaching the first reverse osmosis membrane module bank 10 can be appropriately controlled, deterioration of the reverse osmosis membrane due to the chlorine-based germicide can be suppressed to a minimum.
  • the concentration at the concentrated water outlet of the first reverse osmosis membrane module bank 10 is maintained, an effective concentration of a chlorine-based germicide necessary for sterilization and washing can be secured in the entire first reverse osmosis membrane module bank 10. . Since the chlorine-based disinfectant that has flowed into the first reverse osmosis membrane module bank 10 can prevent the sterilization power from being lost in the middle of the first reverse osmosis membrane module bank 10, the chlorinated germicide in the first reverse osmosis membrane module bank 10 can be prevented. The downstream side can be sufficiently sterilized and washed.
  • the chemical injection of the chlorine-based disinfectant or the precursor of the chlorine-based disinfectant can be stopped when the concentration of free chlorine contained in the second concentrated water exceeds an allowable concentration upper limit.
  • the upper limit of the concentration is, for example, the range of the allowable concentration of free chlorine with respect to the reverse osmosis membrane, the mixing ratio of the water returned after chemical injection and the raw water (water to be treated), and the concentration of free chlorine reaching the reverse osmosis membrane after chemical injection.
  • a minute value can be set in advance according to the remaining rate or the like.
  • the operation, stop, and output of the chemical injection pumps 12, 22 may be controlled based on the measurement by the water quality sensor 60. For example, when the measurement result of the concentration of free chlorine transmitted from the water quality sensor 60 exceeds the allowable concentration upper limit, the chemical injection pumps 12 and 22 can be stopped.
  • the concentration upper limit value can be set in advance to a small value in a control unit or the like of the chemical infusion device (21, 22). According to such control, unreacted hypochlorous acids (free chlorine) and free chlorine dissociated from an unstable chlorine-based disinfectant are less likely to be generated.
  • a chlorine-based germicide having a bound chlorine which has a weak effect of deteriorating the reverse osmosis membrane can be prepared in the vicinity of the chemical injection parts (I, II) at a concentration suitable for sterilization and cleaning.
  • the second concentrated water into which the chemical is injected can be drained out of the system through the drain pipe 280. If the return water is drained out of the system, unreacted hypochlorites (free chlorine) and free chlorine dissociated from the unstable chlorine-based disinfectant will not be returned to the raw water pipe 110. The flow into the reverse osmosis membrane module bank 10 can be suppressed.
  • the water shutoff valve V1 and the water distribution valve V2 may be controlled to open and close based on measurement by the water quality sensor 60. For example, when the measurement result of the concentration of free chlorine transmitted from the water quality sensor 60 exceeds the allowable upper limit of the concentration, the water shutoff valve V1 that is normally open is closed, and the water distribution valve V2 that is normally closed is closed. Can be opened.
  • the concentration upper limit value can be set in advance to a small value in the control unit of the water stop valve V1 and the water distribution valve V2. According to such control, it is possible to more reliably suppress the free chlorine from flowing into the first reverse osmosis membrane module bank 10.
  • the second concentrated water return pipe 240 has the chemical injection section (I, II)
  • the second concentrated water returned to the first pass is provided.
  • a chlorine-based disinfectant or a precursor of a chlorine-based disinfectant can be injected into water. Since the second concentrated water has a lower bromide ion concentration or iodide ion concentration than the raw water, even when the TDS of the raw water is high, it is difficult to generate a strong oxidizing agent such as bromoamine during chemical injection.
  • the second concentrated water return pipe 240 has the chemical injection section (I, II)
  • the bromide ion concentration or the iodide ion concentration can be generated in a low-pipe.
  • chlorine-based germicides such as chloramine dissociate free chlorine when stored at a high concentration, and free chlorine is decomposed and loses bactericidal power. Therefore, it is necessary to store the chlorine-based bactericide at a low concentration until injection.
  • FIG. 4 is a diagram showing a configuration of a reverse osmosis treatment device according to a second embodiment of the present invention.
  • the reverse osmosis treatment device 2 according to the second embodiment includes a first reverse osmosis membrane module bank 10, a second reverse osmosis membrane module bank 20, similarly to the reverse osmosis treatment device 1.
  • the reverse osmosis treatment device 2 according to the second embodiment is different from the reverse osmosis treatment device 1 in that a second concentrated water pipe 230 and a second permeated water return pipe are used instead of the second concentrated water return pipe 240. 260, and the second permeated water return pipe 260 is provided with a chemical injection section (I, II).
  • the second reverse osmosis membrane module bank 20 is connected to a first permeated water pipe 120, a second permeated water pipe 220, and a second concentrated water pipe 230.
  • a second permeated water return pipe 260 branches off from the second permeated water pipe 220. The other end of the second permeated water return pipe 260 is connected downstream of the supply pump P1 of the raw water pipe 110 and upstream of the high pressure pump P2.
  • the second concentrated water pipe 230 is a pipe for flowing the second concentrated water from the second reverse osmosis membrane module bank 20 to the outside of the system.
  • the second permeated water return pipe 260 is a pipe for flowing the second permeated water from the second permeated water pipe 220 to the raw water pipe 110.
  • the second permeated water return pipe 260 returns at least a part of the second permeated water to the primary side of the reverse osmosis membrane of the first reverse osmosis membrane module bank 10, dilutes raw water, and converts the raw water into the first reverse osmosis membrane module bank. At 10 the required reverse osmotic pressure is reduced.
  • the second permeated water return pipe 260 is provided with one or more chemical injection parts (I, II) for injecting a chemical into the pipe.
  • the chemical injection section (I, II) of the second permeated water return pipe 260 is used for sterilizing and cleaning the raw water pipe 110 and the first reverse osmosis membrane module bank 10.
  • a chlorine-based disinfectant or a precursor of the chlorine-based disinfectant is injected as in the case of the reverse osmosis treatment device 1 described above.
  • the second permeated water return pipe 260 has a chemical injection device (11, 12), another chemical injection device (21, 22), a line mixer 50, a water quality sensor 60, A pipe 280, a water stop valve V1, and a water distribution valve V2 can be installed.
  • two chemical injection parts (I, II) are provided in the second permeated water return pipe 260, and a precursor of a chlorine-based disinfectant is dispensed, and chlorine-based disinfection is performed in the pipe.
  • a precursor of a chlorine-based disinfectant is dispensed, and chlorine-based disinfection is performed in the pipe.
  • the chlorine-based disinfectant itself is dispensed, or when only hypochlorous acid is dispensed into water having a high ammonia concentration
  • one of the second permeated water return pipes 260 is supplied.
  • One dosing section may be provided.
  • three or more dispensing sections may be provided according to the number of chlorine-based disinfectants or precursors of chlorine-based disinfectants used.
  • the water to be treated is firstly treated by reverse osmosis in the first reverse osmosis membrane module bank 10 to be separated into first permeated water and first concentrated water,
  • the reverse osmosis membrane module bank 20 the first permeated water is secondarily treated by reverse osmosis to be separated into a second permeated water and a second concentrated water, and at least a part of the second permeated water is returned to the water to be treated.
  • the second permeated water is produced as desalinated water.
  • the second permeated water return pipe 260 is supplied to the chemical injection section (I, II). , A chlorine-based disinfectant or a precursor of the chlorine-based disinfectant is injected.
  • the second permeated water returned to the first reverse osmosis membrane module bank 10 is infused with a chlorine-based disinfectant or a precursor of a chlorine-based disinfectant, and the water containing the chlorine-based disinfectant is passed through the second permeated water. 1
  • the reverse osmosis membrane module of the reverse osmosis membrane module bank 10 and the raw water piping 110 are sterilized and washed.
  • the distribution ratio of the second permeated water to the second permeated water return pipe 260 depends on the concentration of the prepared chlorine-based disinfectant and the precursor of the chlorine-based disinfectant, the quality of the raw water, the specifications of the reverse osmosis membrane module, and the recovery of the permeated water.
  • a suitable condition can be set according to the rate, the quality of the permeated water (the amount of residual chlorine), and the like.
  • the distribution ratio to the second permeate return pipe 260 can be adjusted, for example, by adjusting the flow rate in the second permeate return pipe 220 or the second permeate return pipe 260 using a flow control valve (not shown) or the like.
  • the chemical injection of the chlorine-based disinfectant or the precursor of the chlorine-based disinfectant can be performed under the same conditions as in the reverse osmosis treatment apparatus 1 described above. Injection of the chlorine-based disinfectant or the precursor of the chlorine-based disinfectant can be stopped when the concentration of free chlorine contained in the second permeate exceeds an allowable upper limit of the concentration. Further, when the concentration of free chlorine contained in the second permeated water exceeds the allowable upper limit of the concentration, the second permeated water that has been dispensed can be drained out of the system through the drain pipe 280.
  • the second permeated water return pipe 260 has the chemical injection section (I, II)
  • the second permeated water returned to the first pass is used.
  • a chlorine-based disinfectant or a precursor of a chlorine-based disinfectant can be injected into water. Since the second permeated water has a lower bromide ion concentration or iodide ion concentration than the raw water or the second concentrated water, even if the TDS of the raw water or the second concentrated water is high, strong oxidation of bromoamine or the like at the time of chemical injection is performed. It becomes difficult to form an agent.
  • a chlorine-based germicide can be generated in a pipe having a low bromide ion concentration or a low iodide ion concentration. It is possible to eliminate the necessity of providing a large storage facility for preparing the medicine or taking a long washing time with a low-concentration medicine.
  • FIG. 5 is a diagram illustrating a configuration of a reverse osmosis treatment device according to a third embodiment of the present invention.
  • the reverse osmosis treatment apparatus 3 according to the third embodiment includes a reverse osmosis membrane module bank 30, a raw water pipe 310, a permeated water pipe 320, a concentrated water pipe 330, and a permeated water return pipe 360.
  • the reverse osmosis treatment device 3 is a one-pass reverse osmosis treatment device that performs reverse osmosis treatment of the water to be treated in a single pass, unlike the reverse osmosis treatment devices 1 and 2 described above. .
  • the reverse osmosis membrane module bank 30 of the reverse osmosis treatment device 3 raw water (water to be treated) is separated into permeated water and concentrated water by reverse osmosis treatment.
  • the reverse osmosis membrane module bank 30 includes one or a plurality of reverse osmosis membrane modules.
  • a plurality of reverse osmosis membrane modules constituting a reverse osmosis membrane module bank are connected via a pipe so as to be in a parallel relationship with each other.
  • the reverse osmosis membrane module bank 30 can also constitute a reverse osmosis membrane unit by combining a plurality of reverse osmosis membrane module banks.
  • the plurality of reverse osmosis membrane units can be connected to each other on a drainage side of the permeated water or a drainage side of the concentrated water of an arbitrary reverse osmosis membrane module bank via a pipe so as to have a serial relationship with each other.
  • the reverse osmosis membrane module that constitutes the reverse osmosis membrane module bank 30 can have, for example, the forms shown in FIGS. 2 and 3.
  • the reverse osmosis membrane module bank 30 is connected with a raw water pipe 310, a permeated water pipe 320, and a concentrated water pipe 330.
  • a permeated water return pipe 360 branches off from the permeated water pipe 320. The other end of the permeated water return pipe 360 is connected downstream of the supply pump P1 of the raw water pipe 310 and upstream of the high pressure pump P2.
  • the raw water pipe 310 is a pipe for flowing raw water from a raw water supply source such as a raw water tank to the reverse osmosis membrane module bank 30.
  • the permeated water pipe 320 is a pipe through which permeated water flows from the reverse osmosis membrane module bank 30 to the outside of the system.
  • the concentrated water pipe 330 is a pipe for flowing the concentrated water from the reverse osmosis membrane module bank 30 to the outside of the system.
  • the raw water pipe 310 has a supply pump P3 for transferring the raw water from the source of the raw water toward the reverse osmosis membrane module bank 30, and the pressure of the raw water is increased to a pressure exceeding the osmotic pressure of the reverse osmosis membrane of the reverse osmosis membrane module bank 30. And a high-pressure pump P4.
  • the permeated water return pipe 360 is a pipe through which permeated water flows from the permeated water pipe 320 to the raw water pipe 310.
  • the permeated water return pipe 360 returns at least a part of the permeated water to the primary side of the reverse osmosis membrane of the reverse osmosis membrane module bank 30, dilutes raw water, and reduces the reverse osmosis pressure required in the reverse osmosis membrane module bank 30. Lower.
  • the permeated water return pipe 360 is provided with one or more chemical injection parts (I, II) for injecting a chemical into the pipe.
  • the chemical injection section (I, II) of the permeated water return pipe 360 is used for sterilizing and cleaning the raw water pipe 310 and the reverse osmosis membrane module bank 30.
  • a chlorine-based disinfectant or a precursor of the chlorine-based disinfectant is injected as in the case of the reverse osmosis treatment device 1 described above.
  • the permeated water return pipe 360 has a chemical injection device (11, 12), another chemical injection device (21, 22), a line mixer 50, a water quality sensor 60, a water shutoff valve. V1 and water distribution valve V2 can be installed. Further, a drain pipe 380 for draining return water having free chlorine remaining outside the system can be connected to the permeated water return pipe 360 downstream of the chemical injection section (I, II).
  • two chemical injection parts (I, II) are provided in the permeated water return pipe 360, and a precursor of the chlorine-based disinfectant is dispensed, and the chlorine-based disinfectant is dispensed in the pipe.
  • a precursor of the chlorine-based disinfectant is dispensed, and the chlorine-based disinfectant is dispensed in the pipe.
  • one perforated water return pipe 360 has one dispensing part. May be provided.
  • three or more dispensing sections may be provided according to the number of chlorine-based disinfectants or precursors of chlorine-based disinfectants used.
  • the water to be treated is subjected to reverse osmosis treatment in the reverse osmosis membrane module bank 30 to be separated into permeated water and concentrated water, and at least a part of the permeated water is treated as the treated water.
  • the water to be treated is subjected to reverse osmosis while being returned to the plant, and fresh water is formed as desalinated water.
  • a chlorine-based disinfectant or a precursor of a chlorine-based disinfectant is supplied to the chemical injection section (I, II) of the permeated water return pipe 360. Is injected.
  • the reverse osmosis membrane module bank is provided.
  • the 30 reverse osmosis membrane modules and the raw water piping 310 are sterilized and washed.
  • the reverse osmosis treatment device 3 when a chlorine-based disinfectant or a precursor of a chlorine-based disinfectant is injected into the chemical injection section (I, II) of the permeated water return pipe 360, the bromide ion concentration and iodide of the permeated water are injected. Since the ion concentration is lower than the water to be treated (raw water) supplied to the reverse osmosis membrane module bank 30, a strong oxidizing agent such as bromoamine which deteriorates the reverse osmosis membrane is less likely to be generated. Therefore, the reverse osmosis membrane module and the piping can be sterilized and washed without significantly deteriorating the reverse osmosis membrane of the reverse osmosis membrane module bank 30.
  • the distribution ratio of the permeated water to the permeated water return pipe 360 depends on the concentration of the prepared chlorine-based disinfectant and the precursor of the chlorine-based disinfectant, the quality of the raw water, the specifications of the reverse osmosis membrane module, the permeated water recovery rate, and the permeated water.
  • the conditions can be appropriately determined according to the water quality (residual chlorine amount) of the water.
  • the distribution ratio to the permeated water return pipe 360 can be adjusted, for example, by adjusting the flow rate in the permeated water pipe 320 or the permeated water return pipe 360 using a flow control valve (not shown).
  • the chemical injection of the chlorine-based disinfectant or the precursor of the chlorine-based disinfectant can be performed under the same conditions as in the reverse osmosis treatment apparatus 1 described above. Injection of a chlorine-based disinfectant or a precursor of a chlorine-based disinfectant can be stopped when the concentration of free chlorine contained in the permeated water exceeds an allowable upper limit. When the concentration of free chlorine contained in the permeated water exceeds the allowable upper limit of the concentration of permeated water, the permeated water can be drained out of the system through the drain pipe 380.
  • the permeated water return pipe 360 has the chemical injection section (I, II)
  • the permeated water returned to the reverse osmosis membrane module bank can be used.
  • a chlorine-based disinfectant or a precursor of a chlorine-based disinfectant can be injected. Since the permeated water has a lower bromide ion concentration or iodide ion concentration than the raw water or the concentrated water, even if the TDS of the raw water is high, it is difficult to generate a strong oxidizing agent such as bromoamine during chemical injection.
  • the sterilization and cleaning of the reverse osmosis membrane module and the piping can be continued while avoiding deterioration of the reverse osmosis membrane due to a strong oxidizing agent such as bromoamine. Therefore, it is possible to provide a reverse osmosis treatment capable of suppressing the fouling of the reverse osmosis membrane without greatly deteriorating the reverse osmosis membrane and stably performing the reverse osmosis treatment on the water to be treated having a high TDS.
  • the chlorine-based disinfectant can be generated in a pipe having a low bromide ion concentration or a low iodide ion concentration. It is possible to eliminate the necessity of providing a large storage facility for preparing the medicine or taking a long washing time with a low-concentration medicine.
  • the permeated water return pipe 360 is provided, although the amount of water produced per treatment time decreases, the deterioration of the reverse osmosis membrane can be suppressed, and appropriate operating pressure and membrane performance can be maintained. Total water production can be increased.
  • the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.
  • the present invention is not necessarily limited to one having all the configurations of the above-described embodiment. Replace a part of the configuration of one embodiment with another configuration, add a part of the configuration of one embodiment to another configuration, or omit a part of the configuration of one embodiment. Can be.
  • the reverse osmosis membrane module includes the forms shown in FIGS. 2 and 3.
  • it can be provided as an appropriate module such as a spiral type, a tubular type, or a hollow fiber type.
  • an appropriate device including a pH adjusting mechanism, a pH sensor, and the like in addition to a chemical injection tank, a chemical injection pump, and the like can be used.
  • the second concentrated water return pipe 240, the second permeated water return pipe 260, and the permeated water return pipe 360 are provided with a supply pump (P1, P3) and a high-pressure pump (P2). , P4), but may be connected upstream of the supply pumps (P1, P3). Alternatively, it may be connected to a bypass that branches upstream from the supply pumps (P1 and P3) and joins again downstream, for example, a bypass pipe in which the energy recovery device is installed.
  • an energy recovery device a device that recovers the pressure and flow rate of the concentrated water as energy and pressurizes the water to be treated by energy exchange may be installed.
  • the second concentrated water return pipe 240 returns all of the second concentrated water separated by the second reverse osmosis membrane module bank 20 to the raw water pipe 110.
  • the second concentrated water return pipe 240 may be connected to the concentrated water piping so as to return at least a part of the second concentrated water.
  • the first permeated water pipe 120 may be provided with a supply pump, a high-pressure pump, an intermediate tank, and the like, similarly to the supply side of the first pass.
  • the chemical injection section (I, II), the water stop valve V1, and the water distribution valve V2 are provided at predetermined positions on the pipe.
  • the line mixer 50, the water quality sensor 60, the drain pipes 280, 380, the water stop valve V1, and the water distribution valve V2 may each be omitted.
  • a pipe provided with a baffle plate or the like for generating a turbulent flow or a water tank for mixing and reaction may be provided.

Abstract

La présente invention concerne un dispositif et un procédé de traitement par osmose inverse avec lesquels il est possible de supprimer l'encrassement d'une membrane d'osmose inverse sans provoquer de détérioration majeure de la membrane, et qui peut effectuer de façon stable un traitement d'osmose inverse sur de l'eau brute ayant un taux de MDT élevé. Ce dispositif de traitement par osmose inverse (1) comprend : un premier groupe de modules de membrane d'osmose inverse (10) pour effectuer un traitement primaire sur de l'eau brute afin de séparer l'eau en une première eau de perméat et une première eau concentrée ; un second groupe de modules de membrane d'osmose inverse (20) pour effectuer un traitement secondaire sur la première eau de perméat afin de séparer l'eau en une seconde eau de perméat et une seconde eau concentrée ; et un tuyau de retour (240) pour renvoyer la seconde eau concentrée vers le côté primaire du premier groupe de modules de membrane d'osmose inverse (10), ledit tuyau de retour (240) possédant une ou plusieurs parties d'injection de produit chimique (I, II), servant à injecter un produit chimique dans des tuyaux. Dans une variante, les tuyaux d'injection de produit chimique sont disposés sur un tuyau de retour pour renvoyer la seconde eau de perméat au groupe de modules de membrane d'osmose inverse. Le procédé de traitement par osmose inverse consiste à injecter un bactéricide à base de chlore ou un précurseur bactéricide à base de chlore dans l'eau qui est renvoyée au groupe de modules de membrane d'osmose inverse.
PCT/JP2019/034531 2018-09-20 2019-09-03 Dispositif et procédé de traitement par osmose inverse WO2020059477A1 (fr)

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JP2018176639A JP2020044519A (ja) 2018-09-20 2018-09-20 逆浸透処理装置及び逆浸透処理方法
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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009285565A (ja) * 2008-05-29 2009-12-10 Miura Co Ltd 水処理装置
WO2014010628A1 (fr) * 2012-07-10 2014-01-16 東レ株式会社 Procédé et dispositif de désalinisation
JP2014133214A (ja) * 2013-01-10 2014-07-24 Toshiba Corp 海水淡水化装置および海水淡水化装置の洗浄方法
US20160101389A1 (en) * 2014-10-08 2016-04-14 H2O Innovation Inc. Method of performing a cleaning operation on a water filtration device
WO2016111371A1 (fr) * 2015-01-09 2016-07-14 東レ株式会社 Procédé d'amélioration des performances de blocage de membrane semi-perméable, membrane semi-perméable, et dispositif de génération d'eau douce
WO2017141717A1 (fr) * 2016-02-18 2017-08-24 オルガノ株式会社 Système et procédé de traitement de l'eau par une membrane d'osmose inverse

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009285565A (ja) * 2008-05-29 2009-12-10 Miura Co Ltd 水処理装置
WO2014010628A1 (fr) * 2012-07-10 2014-01-16 東レ株式会社 Procédé et dispositif de désalinisation
JP2014133214A (ja) * 2013-01-10 2014-07-24 Toshiba Corp 海水淡水化装置および海水淡水化装置の洗浄方法
US20160101389A1 (en) * 2014-10-08 2016-04-14 H2O Innovation Inc. Method of performing a cleaning operation on a water filtration device
WO2016111371A1 (fr) * 2015-01-09 2016-07-14 東レ株式会社 Procédé d'amélioration des performances de blocage de membrane semi-perméable, membrane semi-perméable, et dispositif de génération d'eau douce
WO2017141717A1 (fr) * 2016-02-18 2017-08-24 オルガノ株式会社 Système et procédé de traitement de l'eau par une membrane d'osmose inverse

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