JP6422765B2 - Membrane separation treatment system and membrane separation treatment method - Google Patents

Description

  The present invention relates to a membrane separation treatment system and a membrane separation treatment method for performing a membrane separation treatment of water to be treated containing a metal having an oxidizing catalytic action.

  When membranes to be treated are membrane-separated for a long time using a membrane module having a separation membrane, slime may be generated by the propagation of microorganisms and the like contained in the treated water. Therefore, a bactericidal agent such as hypochlorous acid is added to raw water or backwash water.

  Water to be treated containing a metal having an oxidizing catalytic action such as copper, cobalt, iron, manganese, nickel, vanadium is treated with an organic UF made of, for example, polyvinylidene fluoride (PVDF) or polyethersulfone (PES). In a method of removing insoluble components by passing water through a membrane, MF membrane, etc., if treatment is performed by adding a chlorine-based disinfectant such as hypochlorous acid, the elongation and strength of the organic separation membrane are increased. Deteriorated and sometimes caused thread breakage. Further, even in an organic RO membrane, the separation membrane may be deteriorated due to the oxidizing action of hypochlorous acid, resulting in a decrease in the rejection rate.

  This is considered that the metal acts as a catalyst and promotes the deterioration of the organic separation membrane by strengthening the oxidizing power by chlorine. Therefore, at present, when the water to be treated contains these metals, membrane separation treatment cannot be adopted, and treatment must be performed using a method such as sand filtration.

JP 2010-201313 A

  An object of the present invention is to provide a membrane separation treatment system and a membrane separation capable of performing membrane separation treatment with respect to water to be treated containing a metal having an oxidizing catalytic action, by suppressing deterioration of the organic separation membrane. It is to provide a processing method.

The present invention provides a membrane separation treatment means for subjecting treated water containing a metal having an oxidizing catalytic action to membrane separation treatment using an organic separation membrane, the treated water, and the organic separation membrane. and a drug supply means for supplying a drug to at least one of the backwash water for washing, wherein the agent is a bromine-based oxidizing agent, Moshiku is a reaction product of a bromine compound and chlorine-based oxidizing agent comprises a sulfamic acid compound, the, or, bromine-based oxidizing agent, Moshiku is seen containing a reaction product of a bromine compound and chlorine-based oxidizing agent, the reaction product of sulfamic acid compound, the organic-based separator Is a membrane separation treatment system, which is an ultrafiltration membrane made of polyethersulfone .

  In the membrane separation treatment system, the metal having an oxidizing catalytic action is preferably at least one metal selected from copper, cobalt, iron, manganese, nickel, and vanadium.

  In the membrane separation treatment system, the metal concentration in the water to be treated is preferably in the range of 0.1 to 10 mg / L.

The present invention relates to a membrane separation treatment step of subjecting water to be treated containing a metal having an oxidizing catalytic action to a membrane separation treatment using an organic separation membrane, and the water to be treated and the organic separation membrane are reversed. anda drug supply step of supplying a drug to at least one of the backwash water for washing, wherein the agent is a bromine-based oxidizing agent, Moshiku is a reaction product of a bromine compound and chlorine-based oxidizing agent comprises a sulfamic acid compound, the, or, bromine-based oxidizing agent, Moshiku is seen containing a reaction product of a bromine compound and chlorine-based oxidizing agent, the reaction product of sulfamic acid compound, the organic-based separator Is a membrane separation treatment method, which is an ultrafiltration membrane made of polyethersulfone .

  In the membrane separation treatment method, the metal is preferably at least one metal selected from the metals having an oxidizing catalytic action, copper, cobalt, iron, manganese, nickel, and vanadium.

  In the membrane separation treatment method, the metal concentration in the water to be treated is preferably in the range of 0.1 to 10 mg / L.

  In the present invention, a membrane separation treatment system and a membrane separation treatment method capable of performing membrane separation treatment with respect to water to be treated containing a metal having an oxidizing catalytic action by suppressing deterioration of the organic separation membrane. Can be provided.

It is a schematic structure figure showing an example of a membrane separation processing system concerning an embodiment of the present invention. It is a figure which shows the result (The intensity | strength (N / piece) of the separation membrane with respect to CT value (* 10000mg / L * h)) of the tension test in an Example and a comparative example. It is a figure which shows the result (The elongation (%) of a separation membrane with respect to CT value (* 10000 mg / L * h)) of the tension test in an Example and a comparative example.

  Embodiments of the present invention will be described below. This embodiment is an example for carrying out the present invention, and the present invention is not limited to this embodiment.

<Membrane separation treatment system and membrane separation treatment method>
An outline of an example of a membrane separation processing system according to an embodiment of the present invention is shown in FIG. The membrane separation processing system 1 includes a membrane separation device 12 including a separation membrane as membrane separation processing means. The membrane separation processing system 1 may include a raw water tank 10 and a permeated water tank 14.

  In the membrane separation treatment system 1 of FIG. 1, a raw water pipe 20 is connected to the inlet of the raw water tank 10, and the outlet of the raw water tank 10 and the inlet of the membrane separator 12 are connected by a raw water supply pipe 22 via a pump 16. ing. A permeated water pipe 24 is connected to the permeated water outlet of the membrane separator 12, and a concentrated water pipe 28 is connected to the concentrated water outlet. The permeated water pipe 24 and the permeated water tank 14 are connected by a permeated water pipe 26. The lower outlet of the permeate tank 14 and the secondary side of the membrane separator 12 are connected by a backwash water pipe 30 via a pump 18. On the downstream side of the pump 16 in the raw water supply pipe 22, a drug supply pipe 32 is connected as a drug supply means. A medicine supply pipe 34 is connected to the downstream side of the pump 18 in the backwash water pipe 30 as a medicine supply means. What is necessary is just to provide at least one of the medicine supply pipes 32 and 34 as the medicine supply means.

  The operation of the membrane separation processing method and the membrane separation processing system 1 according to the present embodiment will be described.

  Raw water, which is treated water containing a metal having an oxidizing catalytic action, is stored in the raw water tank 10 through the raw water pipe 20 as necessary, and then supplied to the membrane separation device 12 through the raw water supply pipe 22 by the pump 16. The Here, the chemical | medical agent for sterilization is supplied to raw | natural water in the downstream of the pump 16 of the raw | natural water supply piping 22 through the chemical | medical agent supply piping 32 (chemical | medical agent supply process). In the membrane separation device 12, insoluble components are removed from the water to be treated by the separation membrane (membrane separation treatment step).

  The concentrated water obtained by the membrane separation process is discharged through the concentrated water pipe 28. The permeate is discharged through the permeate pipe 24, and at least a part of the permeate is stored in the permeate tank 14 through the permeate pipe 26 branched from the permeate pipe 24.

  When the membrane separator 12 needs to be washed, at least a part of the permeate from the permeate tank 14 is supplied as backwash water from the secondary side of the membrane separator 12 through the backwash pipe 30 by the pump 18. Washing is performed (back washing process). The backwash waste water is discharged from the primary side of the membrane separator 12 through the concentrated water pipe 28. Here, the chemical | medical agent for sterilization may be supplied to the backwashing water in the downstream of the pump 18 of the backwashing water piping 30 through the chemical | medical agent supply piping 34 (medicine supply process). The sterilizing agent may be supplied to at least one of raw water and backwash water.

In the membrane separation treatment method and the membrane separation treatment system according to the present embodiment, a bromine-based oxidizing agent is used as at least one of raw water and backwash water as an agent for preventing clogging of the membrane separation device 12 and suppressing slime formation. , Moshiku is a reaction product of a bromine compound and chlorine-based oxidizing agent, the agent comprising a sulfamic acid compound, the, or, bromine-based oxidizing agent, Moshiku is a reaction product of a bromine compound and chlorine-based oxidizing agent, A drug containing a reaction product with a sulfamic acid compound is supplied.

  That is, in the membrane separation treatment method and the membrane separation treatment system according to the present embodiment, as the agent, “bromine-based oxidant” or “reaction product of bromine compound and chlorine-based oxidant” and “sulfamic acid compound” , Including drugs. Thereby, it is thought that a hypobromite stabilization composition produces | generates in at least one of raw | natural water and backwash water.

  Further, in the membrane separation treatment method and the membrane separation treatment system according to the present embodiment, as the agent, “reaction product of bromine-based oxidant and sulfamic acid compound” or “reaction of bromine compound and chlorine-based oxidant” And a hypobromite stabilizing composition which is a reaction product of the product and a sulfamic acid compound.

  Specifically, in the membrane separation treatment method and the membrane separation treatment system according to the present embodiment, for example, in at least one of raw water and backwash water, “bromine”, “bromine chloride”, or “sodium bromide” “Reactant with hypochlorous acid” and “sulfamic acid compound” are supplied.

  Further, in the membrane separation treatment method and the membrane separation treatment system according to the present embodiment, for example, in at least one of raw water and backwash water, “reaction product of bromine and sulfamic acid compound”, “bromine chloride” The reaction product of sulfamic acid compound with sulfamic acid "or" the reaction product of sodium bromide and hypochlorous acid with sulfamic acid compound "is supplied.

  For example, in the raw water tank 10 or the raw water supply pipe 22, “raw bromine oxidizing agent” or “reaction product of bromine compound and chlorine oxidizing agent” and “sulfamic acid compound” or reaction products thereof are added to the raw water. May be injected by a chemical injection pump or the like. “Brominated oxidant” or “reaction product of bromine compound and chlorinated oxidant” and “sulfamic acid compound” may be added separately, or may be added after mixing in stock solutions. Good.

  Alternatively, in the backwash water pipe 30, “bromine-based oxidant” or “reaction product of bromine compound and chlorine-based oxidant” and “sulfamic acid compound” or these reaction products are added to the backwash water. What is necessary is just to inject | pour with a chemical injection pump etc.

  According to the membrane separation treatment method and the membrane separation treatment system according to the present embodiment, “bromine-based oxidant” or “reaction product of bromine compound and chlorine-based oxidant” in at least one of raw water and backwash water. ”And“ sulfamic acid compound ”or the presence of these reaction products can prevent clogging of the membrane separation device 12 and slime formation. Even for water to be treated containing a metal having an oxidizing catalytic action, it is possible to perform membrane separation treatment by suppressing deterioration of the separation membrane, and the system can be simplified as compared with sand filtration or the like.

  The metal having an oxidizing catalytic action is not particularly limited as long as it is a transition metal and has an action of promoting other chemical reactions, but copper, cobalt, iron, manganese, nickel and vanadium. Among these, the membrane separation treatment method and the membrane separation treatment system according to the present embodiment can be suitably applied to at least one kind of metal.

  The ratio of the equivalent of “sulfamic acid compound” to the equivalent of “bromine-based oxidizing agent” or “reaction product of bromine compound and chlorine-based oxidizing agent” is preferably 1 or more, and is in the range of 1 or more and 2 or less. It is more preferable. If the ratio of the equivalent of “sulfamic acid compound” to the equivalent of “bromine-based oxidizing agent” or “reaction product of bromine compound and chlorine-based oxidizing agent” is less than 1, the active ingredient may not be sufficiently stabilized. If it exceeds 2, the production cost may increase.

  The addition amount of the bactericide in the water to be treated is preferably 0.01 to 10 mg / L in terms of effective chlorine concentration as effective halogen concentration. If it is less than 0.01 mg / L, a sufficient slime-inhibiting effect may not be obtained. If it is more than 10 mg / L, corrosion of metal materials such as piping may be caused.

  Examples of bromine-based oxidizing agents include bromine (liquid bromine), bromine chloride, hypobromite, bromate, bromate, and the like.

  Among these, the preparations of “bromine and sulfamic acid compound” or “reaction product of bromine and sulfamic acid compound” using bromine are the preparations of “hypochlorous acid, bromine compound and sulfamic acid” and “bromine chloride”. It is more preferable because it has less chloride ions and is less likely to cause corrosion of metal materials such as pipes, compared to the formulation of “and sulfamic acid”.

  That is, in the membrane separation treatment method and the membrane separation treatment system according to this embodiment, bromine and a sulfamic acid compound are present in at least one of raw water and backwash water, or bromine and a sulfamic acid compound. It is preferable that the reaction product of

  Examples of bromine compounds include sodium bromide, potassium bromide, lithium bromide, ammonium bromide and hydrobromic acid. Of these, sodium bromide is preferable from the viewpoint of formulation cost and the like.

  Examples of the chlorine-based oxidizing agent include chlorine gas, chlorine dioxide, hypochlorous acid or a salt thereof, chlorous acid or a salt thereof, chloric acid or a salt thereof, perchloric acid or a salt thereof, chlorinated isocyanuric acid or a salt thereof. Etc. Among these, examples of the salt include alkali metal hypochlorites such as sodium hypochlorite and potassium hypochlorite, alkaline earth hypochlorite such as calcium hypochlorite and barium hypochlorite. Metal salts, alkali metal chlorites such as sodium chlorite and potassium chlorite, alkaline earth metal chlorites such as barium chlorite, and other metal chlorites such as nickel chlorite , Alkali metal chlorates such as ammonium chlorate, sodium chlorate and potassium chlorate, and alkaline earth metal chlorates such as calcium chlorate and barium chlorate. These chlorine-based oxidants may be used alone or in combination of two or more. As the chlorine-based oxidant, sodium hypochlorite is preferably used from the viewpoint of handleability.

The sulfamic acid compound is a compound represented by the following general formula (1).
R ₂ NSO ₃ H (1)
(In the formula, R is independently a hydrogen atom or an alkyl group having 1 to 8 carbon atoms.)

  Examples of the sulfamic acid compound include sulfamic acid (amidosulfuric acid) in which both two R groups are hydrogen atoms, N-methylsulfamic acid, N-ethylsulfamic acid, N-propylsulfamic acid, N- A sulfamic acid compound in which one of two R groups such as isopropylsulfamic acid and N-butylsulfamic acid is a hydrogen atom and the other is an alkyl group having 1 to 8 carbon atoms, N, N-dimethylsulfamic acid, N, Two R groups such as N-diethylsulfamic acid, N, N-dipropylsulfamic acid, N, N-dibutylsulfamic acid, N-methyl-N-ethylsulfamic acid, N-methyl-N-propylsulfamic acid, etc. One of two R groups such as a sulfamic acid compound and N-phenylsulfamic acid, both of which are alkyl groups having 1 to 8 carbon atoms, An atom, the other is sulfamic acid compound or a salt thereof, such as an aryl group having 6 to 10 carbon atoms. Examples of the sulfamate include alkali metal salts such as sodium salt and potassium salt, alkaline earth metal salts such as calcium salt, strontium salt and barium salt, manganese salt, copper salt, zinc salt, iron salt, cobalt salt, Other metal salts such as nickel salts, ammonium salts, guanidine salts and the like can be mentioned. The sulfamic acid compounds and salts thereof may be used alone or in combination of two or more. As the sulfamic acid compound, sulfamic acid (amidosulfuric acid) is preferably used from the viewpoint of environmental load.

  In the membrane separation processing method and the membrane separation processing system according to the present embodiment, an alkali may be further present. Examples of the alkali include alkali hydroxides such as sodium hydroxide and potassium hydroxide. From the viewpoint of product stability at low temperatures, sodium hydroxide and potassium hydroxide may be used in combination. Further, the alkali is not solid and may be used as an aqueous solution.

  As a separation membrane of the membrane separation device 12, organic reverse osmosis membrane (RO membrane) nanofiltration made of polyvinylidene fluoride (PVDF), polyethersulfone (PES), piperazine amide, cellulose acetate, polyamide, etc. Examples include a membrane (NF membrane), a microfiltration membrane (MF membrane), and an ultrafiltration membrane (UF membrane). The membrane separation treatment method and the membrane separation treatment system according to the present embodiment can be suitably applied particularly to a separation membrane made of polyethersulfone (PES).

  The membrane separation treatment method and the membrane separation treatment system according to the present embodiment can be suitably applied particularly to polyamide polymer membranes that are currently mainstream as reverse osmosis membranes (RO membranes). Polyamide polymer membranes have a relatively low resistance to oxidizing agents, and when free chlorine or the like is continuously brought into contact with the polyamide polymer membrane, the membrane performance is significantly reduced. However, in the membrane separation processing method and the membrane separation processing system according to the present embodiment, such a remarkable decrease in membrane performance hardly occurs even in the polyamide polymer membrane.

  In the membrane separation treatment method and the membrane separation treatment system according to the present embodiment, the pH of the raw water that is the water to be treated is preferably in the range of 5 to 14, and more preferably in the range of 6.5 to 12. If the pH of the raw water is less than 5, deterioration of the membrane may be promoted or the amount of permeated water may be reduced. Moreover, when the pH of raw | natural water exceeds 12, a film | membrane and a housing may deteriorate.

  In the membrane separation device 12, when scale is generated at pH 5 or higher of raw water, a dispersant may be used in combination with the hypobromite stabilizing composition in order to suppress scale. Examples of the dispersant include polyacrylic acid, polymaleic acid, and phosphonic acid. The amount of the dispersant added to the feed water (pre-membrane separation treated water) is, for example, in the range of 0.1 to 1,000 mg / L as the concentration in the concentrated water.

  Further, in order to suppress the generation of scale without using a dispersant, for example, a membrane separation apparatus so that the silica concentration in the concentrated water is less than the solubility and the Langeria index, which is an index of the calcium scale, is less than 0. Adjusting the operating conditions such as 12 recovery rate.

  The membrane separation treatment method and the membrane separation treatment system according to the present embodiment target treated water containing organic substances such as semiconductor factory wastewater and liquid crystal factory wastewater. The density | concentration of the metal in to-be-processed water is the range of 0.1-10 mg / L, for example.

<Composition for membrane separation treatment>
The composition for membrane separation treatment according to the present embodiment contains “bromine-based oxidant” or “reaction product of bromine compound and chlorine-based oxidant” and “sulfamic acid compound”, and further contains an alkali. It may contain.

  Further, the composition for membrane separation treatment according to the present embodiment includes “a reaction product of a bromine-based oxidant and a sulfamic acid compound”, or “a reaction product of a bromine compound and a chlorine-based oxidant, and a sulfamic acid compound; , A reaction product ”, and may further contain an alkali.

  The bromine-based oxidizing agent, bromine compound, chlorine-based oxidizing agent, and sulfamic acid compound are as described above.

  As the composition for membrane separation treatment according to the present embodiment, one containing bromine and a sulfamic acid compound from the viewpoint of low corrosiveness to metal materials such as piping and less by-product of bromic acid, or Those containing a reaction product of bromine and a sulfamic acid compound are preferred.

  The composition for membrane separation treatment according to the present embodiment has higher oxidizing power and significantly higher slime suppressing power and slime peeling power than a combined chlorine-based slime inhibitor such as chlorosulfamic acid.

  Unlike the oxidizing agent such as hypochlorous acid, the membrane separation treatment composition according to this embodiment hardly deteriorates the reverse osmosis membrane. Further, since the concentration can be measured on site in the same manner as hypochlorous acid or the like, more accurate concentration management is possible.

  The pH of the composition is, for example, more than 13.0, more preferably more than 13.2. When the pH of the composition is 13.0 or less, the effective halogen in the composition may become unstable.

  The bromic acid concentration in the composition for membrane separation treatment is preferably less than 5 mg / kg. When the bromic acid concentration in the composition for membrane separation treatment is 5 mg / kg or more, the quality of the treated water may deteriorate.

<Method for producing composition for membrane separation treatment>
The composition for membrane separation treatment according to this embodiment is obtained by mixing a bromine-based oxidant and a sulfamic acid compound, or by mixing a reaction product of a bromine compound and a chlorine-based oxidant and a sulfamic acid compound. Further, an alkali may be mixed.

  Membrane separation treatment composition containing bromine and sulfamic acid compound or membrane separation treatment composition containing reaction product of bromine and sulfamic acid compound includes water, alkali and sulfamic acid. It is preferable to include a step of adding bromine to the mixed solution containing the compound under an inert gas atmosphere to react. By adding and reacting under an inert gas atmosphere, the bromate ion concentration in the composition becomes lower, which is preferable.

Used but are not limited to inert gas, at least one and preferably one in terms of nitrogen and argon, such as production, nitrogen is particularly preferred from the viewpoint of production cost and the like.

  The oxygen concentration in the reactor upon addition of bromine is preferably 6% or less, more preferably 4% or less, further preferably 2% or less, and particularly preferably 1% or less. If the oxygen concentration in the reactor during the bromine reaction exceeds 6%, the amount of bromic acid produced in the reaction system may increase.

  The addition ratio of bromine is preferably 25% by weight or less, more preferably 1% by weight or more and 20% by weight or less based on the total amount of the composition. If the bromine addition rate exceeds 25% by weight relative to the total amount of the composition, the amount of bromic acid produced in the reaction system may increase. If it is less than 1% by weight, the sterilizing power may be inferior.

  The reaction temperature during the addition of bromine is preferably controlled in the range of 0 ° C. to 25 ° C., but more preferably in the range of 0 ° C. to 15 ° C. from the viewpoint of production cost and the like. When the reaction temperature at the time of bromine addition exceeds 25 degreeC, the production amount of the bromic acid in a reaction system may increase, and when it is less than 0 degreeC, it may freeze.

  Hereinafter, although an example and a comparative example are given and the present invention is explained more concretely in detail, the present invention is not limited to the following examples.

[Preparation of Stabilized Hypobromite Composition]
Under nitrogen atmosphere, liquid bromine: 16.9% by weight (wt%), sulfamic acid: 10.7% by weight, sodium hydroxide: 12.9% by weight, potassium hydroxide: 3.94% by weight, water: remaining The composition was prepared by mixing the minutes. The pH of the composition was 14, and the effective halogen concentration (effective chlorine equivalent concentration) was 7.5% by weight. The detailed method for preparing the stabilized hypobromite composition is as follows.

  Add 1436 g of water and 361 g of sodium hydroxide to a 2 L four-necked flask sealed by continuous injection while controlling the flow rate of nitrogen gas with a mass flow controller so that the oxygen concentration in the reaction vessel is maintained at 1%. Next, after adding 300 g of sulfamic acid and mixing, 473 g of liquid bromine was added while maintaining cooling so that the temperature of the reaction solution was 0 to 15 ° C., and 230 g of 48% potassium hydroxide solution was added. A target composition having a sulfamic acid 10.7% by weight ratio to the total amount of the composition, 16.9% bromine, and an equivalent ratio of sulfamic acid to an equivalent of bromine of 1.04 was obtained. The pH of the resulting solution was 14 as measured by the glass electrode method. The bromine content of the resulting solution was 16.9% as measured by a redox titration method using sodium thiosulfate after bromine was converted to iodine with potassium iodide, and the theoretical content (16.9% ) Of 100.0%. In addition, the oxygen concentration in the reaction vessel during the bromine reaction was measured using “Oxygen Monitor JKO-02 LJDII” manufactured by Zico Corporation. The bromic acid concentration was less than 5 mg / kg.

[Measurement of film strength and elongation]
A single yarn of a UF membrane (manufactured by Toyobo Co., Ltd., UF membrane (manufactured by PES)) is immersed in the following solution at 25 ° C. for 27 to 188 hours, and then a tensile testing machine (manufactured by Minebea Co., Ltd., TCM-1kNB) is used. The film strength (N / piece) and elongation (%) were measured. The respective results are shown in FIGS.

(Test conditions)
Solution 1 Hypochlorous acid aqueous solution Effective halogen concentration: 1000 mg / L
Solution 2 Stabilized hypobromite composition Effective halogen concentration: 1000 mg / L
Solution 3 Cu: 0.1 mg / L-containing hypochlorous acid aqueous solution Effective halogen concentration: 1000 mg / L
Solution 4 Cu: Stabilized hypobromite composition containing 0.1 mg / L Effective halogen concentration: 1000 mg / L

  The effective halogen concentration is measured by a residual chlorine measuring device (measured by the DPD method using “DR-4000” manufactured by Hach) and converted to an effective chlorine concentration. Copper (Cu) was prepared using the reagent copper sulfate.

  The film immersed in stabilized hypobromite had a small decrease in strength and elongation regardless of the presence or absence of copper. In contrast, the film immersed in hypochlorous acid and hypochlorous acid + copper had reduced strength and elongation.

  Thus, it was suggested that the membrane separation treatment can be performed on the water to be treated containing a metal having an oxidizing catalytic action while suppressing the deterioration of the separation membrane.

  DESCRIPTION OF SYMBOLS 1 Membrane separation processing system, 10 Raw water tank, 12 Membrane separation device, 14 Permeated water tank, 16, 18 Pump, 20 Raw water piping, 22 Raw water supply piping, 24, 26 Permeated water piping, 28 Concentrated water piping, 30 Backwash water piping 32, 34 Drug supply piping.

Claims (6)

A membrane separation treatment means for subjecting water to be treated containing a metal having an oxidizing catalytic action to a membrane separation treatment using an organic separation membrane;
A chemical supply means for supplying a chemical to at least one of the treated water and backwash water for backwashing the organic separation membrane;
With
Wherein the agent is a bromine-based oxidizing agent, Moshiku comprises a reaction product of a bromine compound and chlorine-based oxidizing agent, a sulfamic acid compound, the, or, bromine-based oxidizing agent, Moshiku bromine compound and chlorine-based oxidizing look containing a reaction product of the agent, the reaction product of sulfamic acid compound,
The membrane separation processing system, wherein the organic separation membrane is an ultrafiltration membrane made of polyethersulfone . The membrane separation treatment system according to claim 1,
The membrane separation treatment system, wherein the metal having an oxidizing catalytic action is at least one metal selected from copper, cobalt, iron, manganese, nickel and vanadium. The membrane separation treatment system according to claim 1 or 2,
The membrane separation treatment system, wherein the concentration of the metal in the water to be treated is in the range of 0.1 to 10 mg / L. A membrane separation treatment step in which water to be treated containing a metal having an oxidizing catalytic action is subjected to a membrane separation treatment using an organic separation membrane;
A chemical supply step of supplying a chemical to at least one of the water to be treated and backwash water for backwashing the organic separation membrane;
Including
Wherein the agent is a bromine-based oxidizing agent, Moshiku comprises a reaction product of a bromine compound and chlorine-based oxidizing agent, a sulfamic acid compound, the, or, bromine-based oxidizing agent, Moshiku bromine compound and chlorine-based oxidizing look containing a reaction product of the agent, the reaction product of sulfamic acid compound,
The membrane separation treatment method, wherein the organic separation membrane is an ultrafiltration membrane made of polyethersulfone . A membrane separation treatment method according to claim 4,
The membrane separation treatment method, wherein the metal having an oxidizing catalytic action is at least one metal selected from copper, cobalt, iron, manganese, nickel and vanadium. The membrane separation treatment method according to claim 4 or 5,
A membrane separation treatment method, wherein the concentration of the metal in the water to be treated is in the range of 0.1 to 10 mg / L.