WO2012165748A1 - Procédé pour le lavage d'une membrane de filtration utilisant un nouveau désinfectant - Google Patents

Procédé pour le lavage d'une membrane de filtration utilisant un nouveau désinfectant Download PDF

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Publication number
WO2012165748A1
WO2012165748A1 PCT/KR2012/000726 KR2012000726W WO2012165748A1 WO 2012165748 A1 WO2012165748 A1 WO 2012165748A1 KR 2012000726 W KR2012000726 W KR 2012000726W WO 2012165748 A1 WO2012165748 A1 WO 2012165748A1
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Prior art keywords
membrane
water
solution
filtration membrane
isocyanuric acid
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PCT/KR2012/000726
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English (en)
Korean (ko)
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윤제용
유지현
백영빈
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서울대학교산학협력단
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Publication of WO2012165748A1 publication Critical patent/WO2012165748A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
    • B01D65/02—Membrane cleaning or sterilisation ; Membrane regeneration
    • 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
    • B01D65/08—Prevention of membrane fouling or of concentration polarisation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
    • B01D71/06—Organic material
    • B01D71/56—Polyamides, e.g. polyester-amides
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
    • B01D2321/16—Use of chemical agents
    • B01D2321/162—Use of acids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
    • B01D2321/16—Use of chemical agents
    • B01D2321/168—Use of other chemical agents
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/08—Seawater, e.g. for desalination
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00—Specific treatment goals
    • C02F2303/16—Regeneration of sorbents, filters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A20/00—Water conservation; Efficient water supply; Efficient water use
    • Y02A20/124—Water desalination
    • Y02A20/131—Reverse-osmosis

Definitions

  • the present invention relates to a filtration membrane cleaning and bio fouling control method using a new disinfectant, and more particularly, to a filtration membrane cleaning method capable of minimizing membrane damage and reducing membrane performance change by using a new disinfectant.
  • Water treatment method using a filtration membrane is one of the widely used water treatment technology as the depletion and pollution of water resources intensify. It is widely used in water treatment, including desalination of seawater and brackish water, water purification, wastewater treatment, etc. because of its high stability and efficiency since energy efficiency and no additional chemicals are used.
  • water treatment including desalination of seawater and brackish water, water purification, wastewater treatment, etc. because of its high stability and efficiency since energy efficiency and no additional chemicals are used.
  • a fouling phenomenon occurs that contaminants adhere to the surface of the filtration membrane such as the osmosis membrane, thereby reducing performance.
  • the pretreatment process and clean-in-place (CIP) are important, which is a key factor in determining membrane performance and membrane lifetime.
  • Osmotic membrane is a membrane used to separate osmotic pressure, which is a membrane for separating a solution with a difference in concentration, after which a water of a low concentration solution moves through the membrane to a high concentration solution.
  • the reverse osmosis phenomenon is to send water to a low concentration solution by applying an osmotic pressure or more to a high concentration solution, and the separator used at this time is a reverse osmosis membrane.
  • Reverse osmosis membrane system is divided into water treatment, pretreatment, reverse osmosis membrane process, and post treatment.
  • the pretreatment process is an initial treatment of raw water before it is supplied to the reverse osmosis membrane. This process is performed to improve the quality of the raw water at the stage before the reverse osmosis membrane process.
  • the chemical treatment and filter removes contaminants such as organic matter using chemicals and removes them through filters. Physical processing steps.
  • Chlorine solution which is commonly used at this time, is made by diluting a liquid solution such as sodium hypochlorite, which decomposes hypochlorous acid in water.
  • Microorganisms are inactivated by chlorine, a strong oxidizing agent, where inactivation of microorganisms inhibits or kills the growth of microorganisms attached to the membrane or in water to eliminate the infectivity of microorganisms and inhibit the formation of biofilms.
  • Chlorine disinfectants can reduce the contamination of membranes and contribute to maintaining performance and extending the lifespan by killing microorganisms by forming biofilms, reducing the permeation rate of membranes and shortening membrane lifespans and inhibiting their growth.
  • polyamide synthesized on the surface in order to increase the salt removal rate in the reverse osmosis membrane has a weak property to chlorine, which is easily damaged by chlorine treatment, resulting in deterioration of the membrane performance. For this reason, a large amount of reducing agent is added after the pretreatment process to remove residual chlorine present in the feed water of the membrane, thereby preventing damage to the membrane by chlorine.
  • Reverse osmosis membranes are vulnerable to biofouling if microorganisms pass the pretreatment process in the absence of residual disinfectant. Therefore, short-term exposure to reverse osmosis membranes using alkali or complex salts other than chlorine reduces biofouling, but is not very effective.
  • Hypochlorous acid is a strong oxidant with economical disinfection and sterilization ability and is widely used in water treatment process for inactivation of contaminant microorganisms. Hypochlorous acid is a weak acid and exists as hypochlorous acid and hypochlorite ions depending on pH. Chlorine solutions containing hypochlorous acid are also used in various water treatment applications and in pretreatment of reverse osmosis membrane processes.
  • the polyamide-based reverse osmosis membrane Although pretreatment using hypochlorous acid is excellent for inactivating microorganisms, the polyamide-based reverse osmosis membrane, which has been generalized, is damaged from hypochlorous acid and has a disadvantage of degrading the performance of the membrane. That is, the polyamide reverse osmosis membrane has a problem in that its structure is degraded by the chlorine component and thus its performance is lost, thereby shortening the life of the membrane.
  • a large amount of reducing agent used after pretreatment to prevent oxidation of the membrane by the strong oxidizer hypochlorous acid may potentially promote biofouling because it can potentially become a nutrient of the microorganism.
  • the filtration membrane cleaning method of the present invention comprises the step of disinfecting the filtration membrane with a solution containing isocyanuric acid.
  • the filtration membrane may be at least one of reverse osmosis membrane, forward osmosis membrane, nanofiltration membrane, ultrafiltration membrane and microfiltration membrane.
  • a polyamide reverse osmosis membrane is applied as the filtration membrane.
  • the solution containing isocyanuric acid is obtained by dissolving an isocyanurate solid phase including powder and pellets in water.
  • At least one of sodium isocyanur dichloride, potassium isocyanur dichloride, sodium isocyanur trichloride, and potassium isocyanurate trichloride can be used.
  • the filtration membrane is used in a water treatment process including desalination of seawater or brackish water, water purification, sewage treatment and wastewater treatment.
  • the sterilizing of the filtration membrane is a method of injecting a solution containing isocyanuric acid during the pretreatment process, isocyanuric acid before or after the influent is supplied after the pretreatment process is performed.
  • Method of injecting a solution containing, and immersing the filtration membrane in the solution containing the isocyanuric acid or circulating the solution is carried out in any one of the manner.
  • the step of rinsing the filtration membrane with distilled water is further performed.
  • a compaction step of supplying water for a predetermined time to stabilize the permeate amount is further performed before performing the disinfection step.
  • the pressure applied to the membrane in the compaction step is in the range of 200 to 800 psig.
  • the microorganisms attached to the filtration membrane is inactivated through sterilizing the filtration membrane.
  • the isocyanuric acid disinfectant according to the embodiment of the present invention is a component that is well dissolved in water, and does not need to use a separate organic solvent for its dissolution, and maintains an effective chlorine concentration that is relatively stable with respect to pH, temperature, and time. As a result, the membrane can be continuously disinfected and sterilized.
  • FIG. 1 is a view schematically showing an example of a system for performing a water treatment process using a reverse osmosis membrane.
  • FIG. 2 is a flowchart illustrating a reverse osmosis membrane cleaning method according to an embodiment of the present invention.
  • FIG. 3 is a graph showing a change in the amount of permeated water according to the system operating time of the filtration membrane treated with sodium hypochlorite solution.
  • FIG. 4 is a graph showing a change in the amount of permeated water according to the system operation time of the filtration membrane treated with sodium isocyanurium dichloride solution.
  • 5 is a graph showing the change in the salt removal rate according to the system operation time of the filter membrane treated with sodium hypochlorite solution.
  • FIG. 6 is a graph showing the change in the salt removal rate according to the system operation time of the filtration membrane treated with sodium isocyanurium dichloride solution.
  • first and second may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.
  • the first component may be referred to as the second component, and similarly, the second component may also be referred to as the first component.
  • the present invention is to describe a method for cleaning and fouling the polyamide-based reverse osmosis membrane surface control.
  • the filter membrane is used in different materials, in particular, the reverse osmosis membrane is a specific embodiment because the surface of the polyamide is vulnerable to chlorine components. After all, it means that the washing isocyanuric acid solution applicable to the reverse osmosis membrane can be easily applied to various other filtration membranes.
  • the washing method of the present invention is applicable almost without exception to all the filtration membranes used in the water treatment.
  • reverse osmosis membranes, forward osmosis membranes, nanofiltration membranes, ultrafiltration membranes, microfiltration membranes can be applied to all common filtration membranes that require disinfection and washing.
  • the water treatment method can be applied to almost all water treatment methods requiring filtration membranes such as desalination of seawater and brackish water, as well as water purification, sewage treatment, and wastewater treatment.
  • the present invention it is possible to reduce the damage of the filtration membrane by the chlorine solution used as a disinfectant in the washing process to inactivate the microorganism, one of the main causes of contamination to the filtration membrane and to control biofouling, and to decrease the membrane performance due to the filtration membrane damage. It is to use a solution containing isocyanuric acid component is a new chlorine disinfectant to minimize the.
  • microorganisms are inactivated, but the membrane is cleaned using isocyanuric acid, a new disinfectant that has minimal effect on the membrane.
  • isocyanurate all compounds which have high solubility in water and which can be dissolved in water to produce an isocyanuric acid component are applicable.
  • isocyanate dichloride solution and potassium isocyanur dichloride solution are applicable.
  • Filtration membrane disinfection includes various methods such as injecting a chlorine solution into the membrane system and dipping the membrane itself in the chlorine solution or circulating the solution.
  • isocyanuric acid treatment may be performed instead of the conventional hypochlorous acid treatment.
  • an appropriate amount of reducing agent may be used to remove the isocyanuric acid component after treatment, and a reducing agent may not be used to retain trace components. If the isocyanuric acid concentration is kept low, the traces of residual isocyanuric acid in the influent may continue to provide disinfecting effects rather than damaging the membrane, thus cleaning the membrane and controlling biofouling during influent treatment. You will get the effect.
  • the influent may be inactivated and the biofouling in the membrane may be controlled by injecting a low concentration of isocyanuric acid solution into the influent before or during the pretreatment of the influent. have.
  • the biofouling of the membrane through this control has the advantage of slowing down the membrane fouling rate and increasing the cycle time of the cleaning process (CIP).
  • the concentration of isocyanuric acid in the solution should be maintained in an appropriate range.
  • the concentration should be applied at the level necessary for pretreatment of raw water.
  • the pretreatment process is an initial treatment of feed water, which includes chemical treatment of pollutants such as organic matter and physical treatment of removal through a filter. Therefore, the concentration of isocyanuric acid may vary according to various factors such as the degree of pollution of the raw water, the types of components included in the raw water, and the type of raw water.
  • isocyanuric acid solution containing an effective chlorine concentration of about 50 mg / L or less is added.
  • the isocyanuric acid component remaining in the influent after the chemical treatment is continuously passed through the filtration membrane, so the concentration should be lowered so that there is little irritation to the membrane. Therefore, if necessary, an appropriate amount of reducing agent is added to adjust the concentration of isocyanuric acid to a low level, and then to the filtration membrane system.
  • a solution containing an effective chlorine concentration of about 20 mg / L or less is used. It is desirable to. In this case, the disinfecting solution must maintain a low chlorine concentration and can be injected discontinuously or continuously as necessary.
  • the membrane is immersed in a solution containing isocyanuric acid or the solution is circulated.
  • the highest concentration of isocyanuric acid solution is applied because the membrane is brought into contact with the disinfecting solution for a certain time.
  • it is possible to use high concentration solution because the membrane is thoroughly washed with clean water before the production water is redrawn.
  • a solution containing an effective chlorine concentration of about 5000 mg / L or less can be used.
  • the classification of the concentration according to each washing method is for illustration only and is appropriately changed according to various factors such as the type of pollutant in the raw water, the degree of contamination, the type of raw water, whether the damage to the membrane, and whether the by-products are produced. Can be.
  • FIG. 1 is a diagram schematically showing a system for performing a water treatment process using a reverse osmosis membrane.
  • the water treatment system schematically shows each component used to evaluate the performance of the membrane under pressure and temperature conditions for carrying out the reverse osmosis membrane process.
  • the system is largely divided into feed tank (1), temperature controller (2), high pressure pump (3), pressure regulator (4), cell (5), flow valve (6), permeation scale (7), computer (10), etc. It includes.
  • Each cell 5 is equipped with a reverse osmosis membrane in the form of a plate.
  • the reverse osmosis membrane in the form of a plate can be used by cutting a spiral wound membrane into a flat membrane that can be attached to the cell 5.
  • Influent can be supplied to the membrane in a lateral flow manner and pressure can be applied to an appropriate value.
  • the pressure is adjustable for each cell 5 and the pressure regulated by the pressure regulator 4 is monitored via a connected computer 10. Different pressure values may be applied within the range of about 200 to 800 psig, depending on the use of the membrane, such as seawater and brackish water. For example, when using a membrane for water can be set to a constant pressure condition of about 225 psig.
  • FIG. 2 is a flowchart illustrating a reverse osmosis membrane cleaning method according to an embodiment of the present invention. With reference to Figures 1 and 2 will be described the operation of the filtration system and the washing method of the reverse osmosis membrane.
  • the microorganisms are washed with an isocyanuric acid, a new chlorine disinfectant that inactivates but has minimal effect on the membrane and measures the resulting change in membrane performance.
  • the membrane was treated in such a way that a solution containing a high concentration of chlorine was made to immerse the filter membrane in order to show that the membrane performance was maintained well even under high chlorine conditions.
  • the membrane was washed with sodium hypochlorite solution under the same conditions to evaluate the performance and compare the result data.
  • the reverse osmosis membrane mounted in each cell 5 in the form of a flat plate is compacted into tertiary distilled water as inflow water at a constant pressure, temperature, and lateral flow rate until the permeate amount of the membrane is stabilized (FIG. 2, step S10).
  • the third distilled water generally refers to pure distilled water prepared by first distilling tap water, secondly distilling water using a filter, and thirdly distilling water using a semipermeable membrane. Recently, it is also manufactured using a filter, a semipermeable membrane and an ion exchange resin without first distillation.
  • the tertiary distilled water is supplied from the feed tank 1 and the temperature of the tertiary distilled water is kept constant by the temperature controller 2 connected to the tank.
  • the temperature of the influent is 25 ?? It can be maintained at room temperature conditions.
  • the tertiary distilled water of the feed tank 1 is delivered to each cell 5 by a high pressure pump 3 and used for the compaction of the membrane.
  • the time at which the compaction is finished may vary depending on the type of membrane or the sample site of the membrane, and is the point at which it is determined that the permeate is stabilized. If the membrane has a certain amount of permeate, it can be determined that the compaction is completed.
  • treated water such as artificial seawater or brackish water having a salt concentration suitable for the treatment conditions of the membrane is supplied to evaluate the performance of the membrane.
  • treated water such as artificial seawater or brackish water having a salt concentration suitable for the treatment conditions of the membrane
  • a reverse osmosis membrane for brackish membrane performance evaluation can be performed with 2000 mg / L NaCl solution.
  • the treated water such as artificial seawater or brackish water
  • the treated water is used to determine the performance of the membrane by its influent treatment capability, which consists of measuring the permeate and salt removal rates.
  • 2000 mg / L NaCl solution used as influent is sent from feed tank 1 to each cell 5 by high pressure pump 3 and permeate the membrane under constant pressure by pressure regulator 4.
  • the permeate 8 is collected by the automatic flowmeter and after collecting a certain amount, it returns to the feed tank 1 again.
  • the permeate (8) passing through the membrane in the cell is an automatic flow meter, the concentrated water (9) that has not permeated and flows past the membrane to the feed tank (1) as it is.
  • One embodiment thus employs a circulating system in which permeate and concentrated water are returned to feed tank 1.
  • Permeate volume and pressure in the system can be monitored in real time through the computer 10 connected to the system.
  • the permeated water that passed through the membrane for a certain period of time was measured using a permeate water balance (7) to measure the concentration of the salt, from which the performance of the polyamide reverse osmosis membrane before chlorination was evaluated.
  • Membranes evaluated in accordance with the method described above are sterilized using sodium hypochlorite solution (Comparative Example 1) and sodium isocyanurium dichloride solution (Example 1) (FIG. 2, step S20).
  • the disinfection is performed by immersing the membrane in a chlorine solution such as sodium hypochlorite solution, sodium isocyanur dichloride solution, etc. at the same effective chlorine concentration for a predetermined time.
  • a solution of 5000 mg / L effective chlorine concentration can be used and the membrane can be exposed for 1 hour, 2 hours and 3 hours. After disinfection, the membrane is rinsed sufficiently with tertiary distilled water so as not to be affected by the residual chlorine (FIG. 2, step S30), and then mounted in the cell 5 of the system.
  • Permeate volume and salt removal rate can be measured to compare membrane performance with the type of disinfectant and before disinfectant treatment.
  • a spiral wound osmosis reverse osmosis membrane LFC1 (Hydranautics Co.) was dissected and cut into a flat membrane to fit the cell and mounted on the cell. All operations were set to 225 psig (or 15.5 bar) and 27 ⁇ 2 ° C by a temperature controller and pressure regulator. The flow rate through all the cells was controlled to 50 ml / min by the flow valve. In order to find the equilibrium condition, feed 3rd distilled water (Millpore SAS, Mill-Q Direct8) to the feed tank for more than 20 hours, and monitor the permeate flow rate by automatic flow meter. The performance evaluation of the membrane was started.
  • a circulating system was used to provide about 6 L of NaCl solution to the feed tank and permeate and concentrated water back to the feed tank (see FIG. 1).
  • the volume of permeate was measured after receiving the permeate for 1 hour.
  • the salt concentration was measured using a conductivity meter (Horiba, DS-51, 9382-10D). After the initial membrane permeation rate and salt removal rate was confirmed, the membrane was removed from the cell, rinsed thoroughly with tertiary distilled water to remove the contaminants or salts, and the membrane was disinfected.
  • Disinfection of the membrane was carried out using a solution of sodium isocyanur dichloride, with an effective chlorine concentration of 5000 mg / L.
  • the effective chlorine concentration was measured at a wavelength of 530 nm on a UV spectrometer using a DPD reagent (HACH ⁇ , DPD free chlorine reagent). Since the damage of the membrane was caused by the effective chlorine, the experiment was conducted based on the same effective chlorine, and the membrane was exposed to the solution for 1 hour, 2 hours, and 3 hours at a slightly higher concentration than in the actual process.
  • One set of example experiments was conducted with one disinfection solution. The chlorinated membrane was then rinsed sufficiently with flowing tertiary distilled water so that residual chlorine did not remain on the surface and was then put back into the cell.
  • 3 and 4 and 5 and 6 show the results of evaluating the performance of the membrane after disinfection of the membrane using sodium hypochlorite solution and sodium isocyanurium dichloride solution.
  • 3 is a graph showing the change of the permeate amount according to the system operation time of the membrane treated with sodium hypochlorite solution.
  • 4 is a graph showing a change in the amount of permeated water according to the system operation time of the membrane treated with sodium isocyanurium dichloride solution.
  • 5 is a graph showing the change in the salt removal rate with the system operating time of the membrane treated with sodium hypochlorite solution.
  • 6 is a graph showing the change in the salt removal rate according to the system operation time of the membrane treated with sodium isocyanur dichloride solution.
  • the graphs marked with ⁇ and solid line show the results for the case of using the reverse osmosis membrane without the disinfectant treatment.
  • the graph marked with ⁇ shows the result when the membrane was treated with the disinfecting solution for 1 hour
  • the graph marked with ⁇ shows the result when the membrane was treated with the disinfecting solution for 2 hours
  • the graph marked with ⁇ shows the disinfection of the membrane for 3 hours.
  • the result about the case with the solution is shown.
  • the graphs marked with ⁇ show the changing performance when the membrane treated with effective chlorine 5000 mg / L sodium hypochlorite solution for 1 hour was operated in the system as shown in Figure 1 for 120 hours. Represents an evaluation of the performance of the membrane treated for 2 and 3 hours, respectively.
  • the graphs of FIGS. 4 and 6 show the results of performance evaluation of membranes treated with 5000 mg / L of sodium isocyanuric dichloride solution of effective chlorine.
  • 2 shows the water permeation rate of the performance of the membrane.
  • the performance of the membrane treated with sodium isocyanuric dichloride solution shows that the change in the amount of permeate with time is smaller than the performance of the membrane treated with sodium hypochlorite solution (FIG. 3). Can be.
  • the permeate yield decreased sharply after disinfection of the membrane and then increased with increasing system operating time.
  • the longer the disinfectant treatment time the higher the rate of permeation increase, and in the case of the membrane treated for 3 hours, the amount increased by about 1.3 times beyond the initial permeate.
  • the membrane performance treated with sodium isocyanate dichloride solution was significantly smaller than that treated with sodium hypochlorite solution compared to the untreated membrane, and the permeate amount was also not chlorine treated. It can be seen that the decrease is similar to the decrease in permeated water in fouling of the membrane by salt.
  • Membrane treated with sodium hypochlorite solution shows low salt removal rate in spite of high permeated water, so it can be seen that the amount of water passing through the membrane is increased due to surface damage of the membrane by disinfectant, but not only water but also salt of influent.
  • the filter membrane using sodium isocyanate dichloride solution as a disinfectant is superior to the performance maintaining the filter membrane treated with sodium hypochlorite solution, which is used. It can be seen that the effect on the film is small.
  • a method of washing a membrane using an isocyanuric dichloride solution capable of maintaining stable concentrations of effective chlorine for a longer period of time with little damage to the membrane and allowing stable and continuous disinfection.
  • the isocyanurate raw material is in a solid phase, which is convenient for preservation, high solubility in water, easy to use, and inexpensive, and therefore economical.
  • the disinfection and sterilization effect of microorganisms can be maintained for a long time.
  • membranes cleaned using isocyanurate as a disinfectant have a high salt removal rate and a stable permeate rate even during long system operation.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Organic Chemistry (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)

Abstract

L'invention concerne un procédé pour le lavage d'une membrane de filtration utilisant un nouveau désinfectant appliqué au traitement de l'eau, et un procédé pour le contrôle de l'encrassement biologique. Le procédé pour le lavage de la membrane de filtration inclut une étape de désinfection de l'eau brute, de l'afflux d'eau, et d'une membrane de filtration utilisant une solution incluant de l'isocyanurate pour minimiser l'endommagement de la membrane et maintenir une performance supérieure. Les micro-organismes qui forment un biofilm et provoquent l'encrassement biologique peuvent être inactivés pour maintenir un taux élevé d'élimination de sel et une quantité stable de pénétration de l'eau.
PCT/KR2012/000726 2011-05-27 2012-01-31 Procédé pour le lavage d'une membrane de filtration utilisant un nouveau désinfectant WO2012165748A1 (fr)

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KR1020110050798A KR20120132148A (ko) 2011-05-27 2011-05-27 새로운 소독제를 이용한 여과막 세척 방법
KR10-2011-0050798 2011-05-27

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CN105060585A (zh) * 2015-07-31 2015-11-18 浙江至美环境科技有限公司 一种便携式多用途应急饮用水处理设备及处理工艺
KR20180065787A (ko) * 2016-12-08 2018-06-18 금오공과대학교 산학협력단 폐역삼투막 재사용을 위한 세정 방법
CN110898674A (zh) * 2019-11-29 2020-03-24 江苏大储宝环境科技有限公司 净水机反渗透膜清洗剂及制备方法

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KR101427797B1 (ko) * 2013-05-20 2014-10-07 엘지전자 주식회사 수처리용 여과막의 유지세정 방법 및 그 수처리 시스템

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