KR102192071B1 - the method of manufacturing pure water - Google Patents

the method of manufacturing pure water Download PDF

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KR102192071B1
KR102192071B1 KR1020200001478A KR20200001478A KR102192071B1 KR 102192071 B1 KR102192071 B1 KR 102192071B1 KR 1020200001478 A KR1020200001478 A KR 1020200001478A KR 20200001478 A KR20200001478 A KR 20200001478A KR 102192071 B1 KR102192071 B1 KR 102192071B1
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water
reverse osmosis
osmosis filtration
membrane
pure water
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Korean (ko)
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길병기
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비케이이엔지 주식회사
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    • 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
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/469—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis
    • C02F1/4693—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis electrodialysis
    • C02F1/4695—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis electrodialysis electrodeionisation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
    • B01D35/02—Filters adapted for location in special places, e.g. pipe-lines, pumps, stop-cocks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/08—Filter cloth, i.e. woven, knitted or interlaced material
    • B01D61/022—
    • 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
    • B01D61/025—Reverse osmosis; Hyperfiltration
    • 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
    • B01D61/025—Reverse osmosis; Hyperfiltration
    • B01D61/026—Reverse osmosis; Hyperfiltration comprising multiple reverse osmosis steps
    • 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
    • B01D61/42—Electrodialysis; Electro-osmosis ; Electro-ultrafiltration; Membrane capacitive deionization
    • B01D61/44—Ion-selective electrodialysis
    • B01D61/46—Apparatus therefor
    • B01D61/48—Apparatus therefor having one or more compartments filled with ion-exchange material, e.g. electrodeionisation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D63/00—Apparatus in general for separation processes using semi-permeable membranes
    • B01D63/02—Hollow fibre modules
    • 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
    • B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
    • B01D69/08—Hollow fibre membranes
    • 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
    • B01D71/30—Polyalkenyl halides
    • B01D71/32—Polyalkenyl halides containing fluorine atoms
    • B01D71/34—Polyvinylidene fluoride
    • 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
    • C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
    • 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
    • C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
    • 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
    • C02F1/42—Treatment of water, waste water, or sewage by ion-exchange
    • 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
    • C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by 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
    • C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
    • 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
    • C02F2103/02—Non-contaminated water, e.g. for industrial water supply
    • C02F2103/04—Non-contaminated water, e.g. for industrial water supply for obtaining ultra-pure water

Abstract

The present invention relates to a pure water production method of recycling wastewater using a novel electrodeionization device capable of effectively producing pure water. According to the pure water production method of recycling wastewater using a novel electric deionization device of the present invention, effluent discharged from a wastewater treatment plant is stored in an effluent storage tank (10) and then pretreated while passing through an automatic filter (20) and a hollow fiber membrane (30). After the effluent is stored in a filtered water storage tank (40), the effluent is subjected to primary reverse osmosis filtering while passing through a security filter (50) and a primary reverse osmosis filtration membrane (60). After a decarboxylation process, the effluent is subjected to secondary reverse osmosis filtering while passing through a secondary reverse osmosis filtration membrane (70). After being stored in a filtered water storage tank (80), the effluent passes through an electrodeionization device (90), and is purified into pure water and discharged.

Description

전기탈이온장치를 이용한 폐수 처리수 재이용 순수생산방법{the method of manufacturing pure water}The method of manufacturing pure water for reuse of wastewater treated water using an electric deionizer {the method of manufacturing pure water}

본 발명은 효과적으로 순수를 생산할 수 있도록 된 새로운 전기탈이온장치를 이용한 폐수 처리수 재이용 순수생산방법에 관한 것이다.The present invention relates to a pure water production method for recycling wastewater treated water using a novel electrodeionization device capable of effectively producing pure water.

일반적으로 공장이나 사업소 등에서 배출되는 폐수를 처리하는 폐수처리장은, 폐수를 고체액체분리와, 물리화학적 처리, 생물화학적처리, 열처리방법 등을 이용하여 정화한 후, 배출하고 있다.In general, a wastewater treatment plant that treats wastewater discharged from a factory or business office, etc., purifies the wastewater using solid liquid separation, physicochemical treatment, biochemical treatment, heat treatment, etc., and then discharges it.

그런데, 이러한 폐수처리장에서 배출되는 처리수는, 기준에는 적합하지만, 많은 불순물 또는 오염물질이 포함되어 있음으로, 다양한 용도로 활용하지 못하고 단순히 하천등으로 배출해야 하는 문제점이 있었다.However, the treated water discharged from such a wastewater treatment plant meets the standard, but contains many impurities or pollutants, and thus has a problem that it cannot be used for various purposes and must be simply discharged to a river.

또한, 최근에는 불순물이 최대한 제거된 순수의 수요가 증가되고 있다.In addition, recently, the demand for pure water from which impurities are removed as much as possible is increasing.

그런데, 이러한 순수는 다양한 방법으로 생산되는데, 이와 같은 순수를 생산하는 설비의 경우 규모가 매우 크며, 비용이 많이 소요되는 문제점이 발생되었다.However, such pure water is produced in a variety of ways. In the case of a facility that produces such pure water, the scale is very large, and there is a problem that the cost is high.

또한, 이러한 문제점을 해결할 수 있는 새로운 방법이 필요하게 되었다.In addition, there is a need for a new method to solve this problem.

등록특허 10-1981343호,Registered Patent No. 10-1981343,

본 발명은 상기의 문제점을 해결하기 위한 것으로서, 효과적으로 순수를 생산할 수 있도록 된 새로운 전기탈이온장치를 이용한 폐수 처리수 재이용 순수생산방법을 제공함에 그 목적이 있다.The present invention has been made to solve the above problems, and an object of the present invention is to provide a pure water production method for recycling wastewater treated water using a novel electric deionization device capable of effectively producing pure water.

상기한 목적을 달성하기 위한 본 발명은, 폐수처리장에서 방류된 방류수를 제1 공급펌프(22)를 통해 자동여과기(20)로 유입시켜, 방류수에 포함되어 있는 부유물질을 여과 제거하고, 자동여과기(20)를 통과한 여과수를 중공사막(30)에 투과시켜 여과수에 포함된 고분자 유기물 및 콜로이드성 현탁물질, 미생물, 단백질성물질을 분리 제거하는 전처리단계(A)와, 상기 전처리단계(A)의 전처리를 거친 여과수를 여과수저장조(40)에 저장한 후 제2 공급펌프(52)를 통해 보안여과기(50)로 유입시켜 이물질을 제거하고 이물질이 제거된 여과수를 제1 고압펌프(62)를 이용하여 평막형태의 폴리아마이드계 1차 역삼투여과막(60)을 투과시켜 무기성 이온과 저분자 유기물을 분리 제거하여 용수를 생산하는 1차 역삼투여과단계(B)와, 상기 1차 역삼투여과단계(B)의 용수를 pH 8~10으로 조정하여 용수에 포함된 이산화탄소를 제거하는 탈탄산단계(C)와, 상기 탈탄산단계(C)를 통과한 용수를 제2 고압펌프(72)를 이용하여 폴리아마이드계 2차 역삼투여과막(70)을 통과시켜 용수에 포함된 잔여 무기성 이온을 재차 분리 제거하는 2차 역삼투여과단계(D)와, 상기 2차 역삼투여과단계(D)를 통과한 투과수를 투과수저장조(80)에 저장한 후 제3 공급펌프(92)를 통해 전기탈이온장치(90)에 공급하여 전류 및 이온교환수지를 이용하여 잔여 이온을 최종처리하여 순수를 생산하는 순수생산단계(E)를 포함하는 것을 특징으로 하는 전기탈이온장치를 이용한 폐수 처리수 재이용 순수생산 방법이 제공된다.The present invention for achieving the above object is to introduce the effluent discharged from the wastewater treatment plant into the automatic filter 20 through the first supply pump 22, to filter and remove the suspended matter contained in the effluent, and the automatic filter Pretreatment step (A) of separating and removing polymer organic matter, colloidal suspension material, microorganism and proteinaceous material contained in the filtered water by permeating the filtered water passing through (20) through the hollow fiber membrane 30, and the pretreatment step (A) The filtered water that has undergone the pretreatment of is stored in the filtered water storage tank 40, and then introduced into the security filter 50 through the second supply pump 52 to remove foreign substances, and the filtered water from which the foreign substances are removed is transferred to the first high pressure pump 62. The first reverse osmosis filtration step (B) of producing water by separating and removing inorganic ions and low-molecular organic substances by permeating the flat-membrane-type polyamide-based primary reverse osmosis filtration membrane 60, and the first reverse osmosis filtration step ( The decarbonation step (C) of removing carbon dioxide contained in the water by adjusting the water of B) to a pH of 8 to 10, and the water that has passed through the decarbonation step (C) using a second high-pressure pump 72 Permeation through the second reverse osmosis filtration step (D) in which residual inorganic ions contained in the water are separated and removed again by passing through the polyamide-based secondary reverse osmosis filtration membrane (70) and the second reverse osmosis filtration step (D). Pure water that stores water in the permeate storage tank 80 and then supplies it to the electric deionizer 90 through the third supply pump 92 to finally process residual ions using current and ion exchange resin to produce pure water. There is provided a pure water production method for recycling wastewater treated water using an electric deionization device comprising the production step (E).

본 발명의 다른 특징에 따르면, 상기 1차 역삼투여과단계(B)에서 1차 역삼투여과막(60)을 통과하지 못한 여과수는 별도의 배수관로 또는 폐수처리장으로 유입시키도록 된 것을 특징으로 하는 전기탈이온장치를 이용한 폐수 처리수 재이용 순수생산 방법이 제공된다.According to another feature of the present invention, the filtered water that has not passed through the first reverse osmosis filtration membrane 60 in the first reverse osmosis filtration step (B) is introduced into a separate drainage pipe or wastewater treatment plant. A method for producing pure water using an ion device for recycling wastewater treatment water is provided.

본 발명의 또 다른 특징에 따르면, 상기 2차 역삼투여과단계(D)의 2차 역삼투여과막(70)을 통과하지 못하거나, 상기 순수생산단계(E)의 전기탈이온장치(90)를 통과하지 못한 용수 또는 투과수는 상기 여과수저장조(40)로 순환되는 것을 특징으로 하는 전기탈이온장치를 이용한 폐수 처리수 재이용 순수생산 방법이 제공된다.According to another feature of the present invention, it does not pass through the second reverse osmosis filtration membrane 70 of the second reverse osmosis filtration step (D), or passes through the electrodeionization device 90 of the pure production step (E). There is provided a pure water production method for recycling wastewater treated water using an electric deionization device, characterized in that the unsuccessful water or permeated water is circulated to the filtered water storage tank 40.

본 발명의 또 다른 특징에 따르면, 전처리 과정에서는 중공사막(30)을 보호하기 위해 비산화성 살균제로서 질산마그네슘, 클로로메틸 이소티아졸을 사용하는 것을 특징으로 하는 전기탈이온장치를 이용한 폐수 처리수 재이용 순수생산 방법이 제공된다.According to another feature of the present invention, in the pretreatment process, in order to protect the hollow fiber membrane 30, magnesium nitrate and chloromethyl isothiazole are used as non-oxidizing disinfectants. Pure production methods are provided.

본 발명의 또 다른 특징에 따르면, 상기 중공사막(30)은 폴리불화비닐재질 멤브레인 형태의 0.01㎛ 공경의 가압형 분리막을 이용하며, 설치 규모는 직경 216mm, 높이 2160mm의 1조당 30기 이상을 장착하여 2조 이상 설치된 것을 특징으로 하는 전기탈이온장치를 이용한 폐수 처리수 재이용 순수생산 방법이 제공된다.According to another feature of the present invention, the hollow fiber membrane 30 uses a pressure-type separator with a pore diameter of 0.01 μm in the form of a polyvinyl fluoride membrane, and the installation scale is 216 mm in diameter and 30 units per group having a height of 2160 mm. Thus, there is provided a pure water production method for recycling wastewater treated water using an electric deionization device, characterized in that two or more sets are installed.

본 발명의 또 다른 특징에 따르면, 중공사막(30)의 유입압력은 동절기 1,2bar, 기타절기 0.9bar 이하이고, 역세척은 30분 1회, 주기적으로 실시하나, 중공사막(30)을 통과한 여과수의 양이 부족할 경우 여과수저장조(40)가 50%이상 충수 되었을 경우 실시하며, 중공사막(30)을 통과한 여과수와 공기를 병행하여 실시하는 것을 특징으로 하는 전기탈이온장치를 이용한 폐수 처리수 재이용 순수생산 방법이 제공된다.According to another feature of the present invention, the inlet pressure of the hollow fiber membrane 30 is 1,2 bar in winter and 0.9 bar in other seasons, and backwashing is performed once for 30 minutes, but it passes through the hollow fiber membrane 30 When the amount of filtered water is insufficient, it is carried out when the filtered water storage tank 40 is filled with 50% or more, and wastewater treatment using an electric deionizer characterized in that the filtered water and air that have passed through the hollow fiber membrane 30 are carried out in parallel. A pure water production method is provided.

본 발명의 또 다른 특징에 따르면, 상기 전처리단계(A)에서는 오염물질을 제거하기 위하여, 2차 역삼투여과단계(D)에서 생산된 투과수에, 유기세척제로 차아염소산나트륨 및 수산화나트륨과, 무기세척제로서는 염화수소와 구연산을 혼합하여 사용하며, 3개월에 1회 또는 중공사막(30)의 유입압력이 동절기 1,2bar, 기타절기 0.9bar 이상일 경우 실시하는 것을 특징으로 하는 전기탈이온장치를 이용한 폐수 처리수 재이용 순수생산 방법이 제공된다.According to another feature of the present invention, in the pretreatment step (A), in order to remove contaminants, in the permeated water produced in the second reverse osmosis filtration step (D), sodium hypochlorite and sodium hydroxide as organic detergents, and inorganic Wastewater using an electric deionizer, characterized in that a mixture of hydrogen chloride and citric acid is used as a cleaning agent, and is carried out once every three months or when the inlet pressure of the hollow fiber membrane 30 is 1,2bar in winter and 0.9bar in other seasons. A pure water production method for reuse of treated water is provided.

본 발명의 또 다른 특징에 따르면, 상기 1차 역삼투여과단계(B)의 보안여과기(50)는 공극 5~25㎛인 여과천을 이용하며, 상기 1차 역삼투여과막(60)의 유입압력은 동절기 10~14bar, 기타절기 9~13bar이고, 표준염제거율은 99%이상이며, 회수율은 62~66%로 하여 용수를 생산하도록 된 것을 특징으로 하는 전기탈이온장치를 이용한 폐수 처리수 재이용 순수생산 방법이 제공된다.According to another feature of the present invention, the security filter 50 of the first reverse osmosis filtration step (B) uses a filter cloth having a void of 5 to 25 µm, and the inlet pressure of the first reverse osmosis filtration membrane 60 is Pure production for reuse of wastewater treated water using an electric deionizer, characterized in that it is 10 to 14 bar in winter, 9 to 13 bar in other seasons, and the standard salt removal rate is over 99%, and the recovery rate is 62 to 66%. A method is provided.

본 발명의 또 다른 특징에 따르면, 상기 1차 역삼투여과단계(B)에서는 오염물질을 제거하기 위하여, 2차 역삼투여과단계(D)에서 생산된 투과수에, 유기세척제로서 에틸렌디아민테트라아세트산테트라나트륨염사수화물 및 수산화나트륨과, 무기세척제로서는 염화수소를 혼합하여 사용하며, 월 1회 또는 1차 역삼투여과막(60)의 유입압력이 동절기 14bar, 기타절기 13bar 이상일 경우 실시하는 것을 특징으로 하는 전기탈이온장치를 이용한 폐수 처리수 재이용 순수생산 방법이 제공된다.According to another feature of the present invention, in order to remove contaminants in the first reverse osmosis filtration step (B), ethylenediamine tetraacetate tetrasodium as an organic cleaning agent is added to the permeate produced in the second reverse osmosis filtration step (D). Electrodeionization, characterized in that it is performed by mixing salt tetrahydrate and sodium hydroxide with hydrogen chloride as an inorganic cleaning agent, and is performed once a month or when the inlet pressure of the primary reverse osmosis filtration membrane (60) is 14 bar in winter and 13 bar in other seasons. A method of producing pure water for recycling wastewater treated water using an apparatus is provided.

본 발명의 또 다른 특징에 따르면, 상기 2차 역삼투여과막(70)의 유입압력은 동절기 6~9bar, 기타절기 5~8bar이고, 회수율은 88~92%인 것을 특징으로 하는 전기탈이온장치를 이용한 폐수 처리수 재이용 순수생산 방법이 제공된다.According to another feature of the present invention, the inlet pressure of the secondary reverse osmosis membrane 70 is 6 to 9 bar in winter and 5 to 8 bar in other seasons, and an electric deionization device, characterized in that the recovery rate is 88 to 92%. A method for producing pure water for reuse of used wastewater treatment water is provided.

본 발명의 또 다른 특징에 따르면, 상기 2차 역삼투여과단계(D)에서, 1차 역삼투여과단계(B)에서 생산된 용수에 수산화나트륨을 공급하여, 2차 역삼투여과단계(D)에서의 유기물 파울링을 줄이며 용해된 CO2를 HCO3-로 치환하여 상기 전기탈이온장치(90)에 적합한 투과수를 생산하는 것을 특징으로 하는 전기탈이온장치를 이용한 폐수 처리수 재이용 순수생산 방법이 제공된다.According to another feature of the present invention, in the second reverse osmosis filtration step (D), sodium hydroxide is supplied to the water produced in the first reverse osmosis filtration step (B), and the organic matter in the second reverse osmosis filtration step (D) There is provided a pure water production method for recycling wastewater treated water using an electrodeionization device, characterized in that polluting is reduced and dissolved CO2 is replaced with HCO3- to produce permeated water suitable for the electrodeionization device 90.

본 발명의 또 다른 특징에 따르면, 상기 2차 역삼투여과단계(D)에서는 오염물질을 제거하기 위하여, 상기 2차 역삼투여과단계(D)에서 생산된 투과수에 유기세척제로서 에틸렌디아민테트라아세트산테트라나트륨염사수화물 및 수산화나트륨과, 무기세척제로서 염화수소를 혼합하여 사용하며, 3개월에 1회 또는 상기 2차 역삼투여과막(70)의 유입압력이 동절기 9bar, 기타절기 8bar 이상일 경우 실시하는 것을 특징으로 하는 전기탈이온장치를 이용한 폐수 처리수 재이용 순수생산 방법이 제공된다.According to another feature of the present invention, in order to remove contaminants in the second reverse osmosis filtration step (D), ethylenediamine tetraacetate tetrasodium as an organic cleaning agent in the permeated water produced in the second reverse osmosis filtration step (D). It is characterized in that it is used by mixing salt tetrahydrate and sodium hydroxide with hydrogen chloride as an inorganic detergent, and is carried out once every three months or when the inlet pressure of the secondary reverse osmosis filtration membrane 70 is 9 bar in winter and 8 bar in other seasons. A method of producing pure water using an electric deionization device for recycling wastewater treatment water is provided.

본 발명이 다른 특징에 따르면, 상기 전기탈이온장치(90)는 양극과 음극 사이에 양이온과 음이온 교환 멤브레인을 교대로 배열하여 희석실과 농축실, 전해액실로 구성되며, 희석실에 충진된 양이온교환수지와 음이온교환수지에 직류전압을 가하여 적용된 DC전위에 의해 희석실에 있는 이온들이 막을 통과하여 농축실로 이동하게 되고 물은 희석실을 통해 계속 흐르며 이온들이 점점 제거되어 순수를 생산하는 것을 특징으로 하는 전기탈이온장치를 이용한 폐수 처리수 재이용 순수생산 방법이 제공된다.According to another aspect of the present invention, the electrodeionization device 90 is composed of a dilution chamber, a concentration chamber, and an electrolyte chamber by alternately arranging cation and anion exchange membranes between an anode and a cathode, and a cation exchange resin filled in the dilution chamber. Electricity characterized in that the ions in the dilution chamber pass through the membrane and move to the concentration chamber by applying a DC voltage to the anion exchange resin and the water continues to flow through the dilution chamber, and the ions are gradually removed to produce pure water. A method of producing pure water using a deionization device for recycling wastewater treatment water is provided.

본 발명의 또 다른 특징에 따르면, 상기 순수생산단계(E)에서는 오염물질을 제거하기 위하여, 순수생산단계(E)에서 생산된 순수에, 유기세척제로 염화나트륨 및 수산화나트륨과, 무기세척제로서는 염화수소를 혼합하여 사용하며, 6개월에 1회 또는 순수 전기전도도 10MΩ 이하일 경우 실시하는 것을 특징으로 하는 전기탈이온장치를 이용한 폐수 처리수 재이용 순수생산 방법이 제공된다.According to another feature of the present invention, in the pure water production step (E), in order to remove contaminants, in the pure water produced in the pure production step (E), sodium chloride and sodium hydroxide as an organic detergent, and hydrogen chloride as an inorganic detergent. There is provided a pure water production method for recycling wastewater treated water using an electric deionizer, characterized in that it is mixed and used, and is carried out once every 6 months or when the pure electrical conductivity is 10 MΩ or less.

본 발명에 따른 전기탈이온장치를 이용한 폐수 처리수 재이용 순수생산 방법에 따르면, 폐수처리장에서 배출된 방류수는 상기 방류수저장조(10)에 저장된 후, 자동여과기(20)와 중공사막(30)을 통과하면서 전처리되고, 상기 여과수저장조(40)에 저장된 후, 보안여과기(50)와 1차 역삼투여과막(60)을 통과하면서 1차 역삼투여과되고, 탈탄산과정을 거친 후, 상기 2차 역삼투여과막(70)을 통과하면서 2차 역삼투여과되고, 상기 투과수저장조(80)에 저장된 후 상기 전기탈이온장치(90)를 통과하여 순수로 정제되어 배출된다.According to the pure water production method for reuse of wastewater treated water using the electric deionization device according to the present invention, the effluent discharged from the wastewater treatment plant is stored in the effluent storage tank 10 and then passes through the automatic filter 20 and the hollow fiber membrane 30. After pretreatment and storage in the filtered water storage tank 40, the first reverse osmosis is filtered while passing through the security filter 50 and the first reverse osmosis filtration membrane 60, and after the decarboxylation process, the second reverse osmosis filtration membrane It is subjected to secondary reverse osmosis while passing through 70, is stored in the permeate storage tank 80, passes through the electrodeionizer 90, is purified into pure water, and is discharged.

따라서, 효과적으로 순수를 생산할 수 있는 장점이 있다.Therefore, there is an advantage of being able to effectively produce pure water.

도 1은 본 발명에 따른 전기탈이온장치를 이용한 폐수 처리수 재이용 순수생산 방법을 도시한 순서도,
도 2는 전기탈이온장치를 이용한 폐수 처리수 재이용 순수생산 방법에 사용되는 폐수 처리수 재이용 순수생산설비를 도시한 구성도이다.1 is a flow chart showing a pure water production method for recycling wastewater treated water using an electric deionization device according to the present invention;
2 is a block diagram showing a pure water production facility for recycling wastewater treatment water used in a pure water production method for recycling wastewater treatment water using an electric deionization device.

이하, 본 발명을 첨부된 예시도면에 의거하여 상세히 설명한다.Hereinafter, the present invention will be described in detail on the basis of the accompanying drawings.

도 1 및 도 2는 본 발명에 따른 전기탈이온장치를 이용한 폐수 처리수 재이용 순수생산 방법을 도시한 것으로, 폐수처리장에서 방류된 방류수를 전처리하는 전처리단계(A)와, 상기 전처리단계(A)의 전처리를 거친 여과수를 여과수저장조(40)에 저장한 후 여과하여 용수를 생산하는 1차 역삼투여과단계(B)와, 상기 1차 역삼투여과단계(B)의 용수를 pH 8~10으로 조정하여 용수에 포함된 이산화탄소를 제거하는 탈탄산단계(C)와, 상기 탈탄산단계(C)를 통과한 용수에 포함된 잔여 무기성 이온을 재차 분리 제거하는 2차 역삼투여과단계(D)와, 상기 2차 역삼투여과단계(D)를 통과한 투과수를 투과수저장조(80)에 저장한 후 투과수에 포함된 잔여 이온을 최종처리하여 순수를 생산하는 순수생산단계(E)로 구성된다.1 and 2 illustrate a method for producing pure water for reuse of wastewater treated water using an electric deionization device according to the present invention, a pretreatment step (A) of pretreating the effluent discharged from a wastewater treatment plant, and the pretreatment step (A). The first reverse osmosis filtration step (B) in which the filtered water that has undergone pretreatment in is stored in the filtered water storage tank 40 and then filtered to produce water, and the water in the first reverse osmosis filtration step (B) are adjusted to pH 8-10. A decarbonation step (C) of removing carbon dioxide contained in the water, and a second reverse osmosis filtration step (D) of separating and removing the remaining inorganic ions in the water that has passed through the decarbonation step (C) again, and the It consists of a pure water production step (E) in which the permeated water that has passed through the second reverse osmosis filtration step (D) is stored in the permeated water storage tank 80, and then the residual ions contained in the permeated water are finally treated to produce pure water.

이를 자세히 설명하면, 상기 전처리단계(A)는 폐수처리장에서 방류된 방류수를 제1 공급펌프(22)를 통해 자동여과기(20)로 유입시켜 방류수에 포함되어 있는 부유물질을 여과 제거하고 상기 자동여과기(20)를 통과한 여과수를 중공사막(30)에 투과시켜 여과수에 포함된 고분자 유기물 및 콜로이드성 현탁물질, 미생물, 단백질성물질을 분리 제거하는 단계이다.In detail, in the pretreatment step (A), the effluent discharged from the wastewater treatment plant is introduced into the automatic filter 20 through the first supply pump 22 to filter and remove the suspended substances contained in the effluent, and the automatic filter This is a step of separating and removing polymer organic substances, colloidal suspension substances, microorganisms, and protein substances contained in the filtered water by permeating the filtered water passing through (20) through the hollow fiber membrane 30.

이때, 상기 폐수처리장에는 방류수를 저장하는 방류수저장조(10)가 구비되며, 상기 자동여과기(20)는 제1 공급관(21)을 통해 상기 방류수저장조(10)에 연결되고, 상기 제1 공급펌프(22)는 상기 제1 공급관(21)에 구비된다.At this time, the wastewater treatment plant is provided with a effluent storage tank 10 for storing effluent water, and the automatic filter 20 is connected to the effluent storage tank 10 through a first supply pipe 21, and the first supply pump ( 22) is provided in the first supply pipe 21.

그리고, 상기 중공사막(30)은 제2 공급관(31)을 통해 상기 자동여과기(20)에 연결된다.In addition, the hollow fiber membrane 30 is connected to the automatic filter 20 through a second supply pipe 31.

상기 중공사막(30)은 폴리불화비닐재질 멤브레인 형태의 0.01㎛ 공경의 가압형 분리막을 이용하며, 설치 규모는 직경 216mm, 높이 2160mm의 1조당 30기 이상을 장착하여 2조 이상 설치되는 것으로, 유입압력은 동절기 1.2bar, 기타절기 0.9bar 이하이며, 역세척을 30분 1회, 주기적으로 실시하여, 내부의 이물질을 제거하도록 구성된다.The hollow fiber membrane 30 uses a pressure-type separator with a pore diameter of 0.01 μm in the form of a polyvinyl fluoride membrane, and the installation scale is 2 sets or more installed by installing 30 or more per set of 216 mm in diameter and 2160 mm in height. The pressure is 1.2 bar in winter and 0.9 bar in other seasons, and it is configured to remove foreign substances inside by performing backwashing once for 30 minutes, periodically.

이때, 상기 중공사막(30)은 중공사막(30)을 통과한 여과수의 양이 부족할 경우 여과수저장조(40)가 50%이상 충수 되었을 경우 역세척을 실시하며, 역세척은 중공사막(30)을 통과한 여과수와 공기를 병행하여 실시한다.At this time, when the amount of filtered water passing through the hollow fiber membrane 30 is insufficient, the hollow fiber membrane 30 is backwashed when the filtered water storage tank 40 is filled with 50% or more, and the backwashing is performed by using the hollow fiber membrane 30 Passed filtered water and air are carried out in parallel.

또한, 상기 전처리단계(A)에서는 오염물질을 제거하기 위하여, 2차 역삼투여과단계(D)에서 생산된 투과수에, 유기세척제로 차아염소산나트륨 및 수산화나트륨과, 무기세척제로서는 염화수소와 구연산을 혼합하여 사용한다.In addition, in the pretreatment step (A), in order to remove contaminants, sodium hypochlorite and sodium hydroxide are mixed with the permeate produced in the second reverse osmosis filtration step (D) as an organic detergent, and hydrogen chloride and citric acid are mixed as an inorganic detergent. And use it.

즉, 상기 투과수에 유기세척제와 무기세척제를 혼합하여, 상기 중공사막(30)에 공급함으로써, 오염물질을 제거한다.That is, an organic detergent and an inorganic detergent are mixed with the permeated water and supplied to the hollow fiber membrane 30 to remove contaminants.

이때, 오염물질을 제거하는 작업은 3개월에 1회 또는 중공사막(30)의 유입압력이 동절기 1.2bar, 기타절기 0.9bar 이상일 경우 실시한다.At this time, the work of removing contaminants is performed once every three months or when the inlet pressure of the hollow fiber membrane 30 is 1.2 bar in winter and 0.9 bar in other seasons.

또한, 전처리 과정에서는 중공사막(30)을 보호하기 위해 비산화성 살균제로서 질산마그네슘, 클로로메틸 이소티아졸을 사용한다.In addition, in the pretreatment process, magnesium nitrate and chloromethyl isothiazole are used as non-oxidizing disinfectants to protect the hollow fiber membrane 30.

즉, 상기 자동여과기(20) 또는 중공사막(30)에는 일정량의 질산마그네슘 또는 클로로메틸 이소티아졸이 지속적 또는 간헐적으로 주입되어, 균의 증식을 방지한다.That is, a certain amount of magnesium nitrate or chloromethyl isothiazole is continuously or intermittently injected into the automatic filter 20 or the hollow fiber membrane 30 to prevent the growth of bacteria.

또한, 상기 중공사막(30)은 자체 여과수로 역세척을 하여 역세수가 필요 없는 자동 여과기로 부유물질을 제거시켜 중공사막(30)과 1차 역삼투여과막(60)의 사용기한을 연장하여 폐기물 발생량 절감을 하도록 구성된다.In addition, the hollow fiber membrane 30 is backwashed with its own filtered water to remove suspended substances with an automatic filter that does not require backwashing to extend the expiration date of the hollow fiber membrane 30 and the primary reverse osmosis filtration membrane 60 to generate waste. It is configured to make savings.

상기 1차 역삼투여과단계(B)는 상기 전처리단계(A)의 전처리를 거친 여과수를 여과수저장조(40)에 저장한 후 제2 공급펌프(52)를 통해 보안여과기(50)로 유입시켜 이물질을 제거하고 이물질이 제거된 여과수를 제1 고압펌프(62)를 이용하여 평막형태의 폴리아마이드계 1차 역삼투여과막(60)을 투과시켜 무기성 이온과 저분자 유기물을 분리 제거하여 용수를 생산하는 단계이다.In the first reverse osmosis filtration step (B), the filtered water that has undergone the pretreatment of the pre-treatment step (A) is stored in the filtered water storage tank 40 and then introduced into the security filter 50 through the second supply pump 52 to prevent foreign matter. The step of producing water by separating and removing inorganic ions and low-molecular organic substances by permeating the filtered water from which foreign substances have been removed through the flat-membrane type polyamide primary reverse osmosis filtration membrane 60 using the first high-pressure pump 62 to be.

이때, 여과수저장조(40)는 제3 공급관(41)을 통해 상기 중공사막(30)에 연결되고, 상기 보안여과기(50)는 제4 공급관(51)을 통해 상기 여과수저장조(40)에 연결되며, 상기 제2 공급펌프(52)는 상기 제4 공급관(51)에 구비된다.At this time, the filtered water storage tank 40 is connected to the hollow fiber membrane 30 through a third supply pipe 41, and the security filter 50 is connected to the filtered water storage tank 40 through a fourth supply pipe 51, , The second supply pump 52 is provided in the fourth supply pipe 51.

그리고, 상기 1차 역삼투여과막(60)은 제5 공급관(61)을 통해 상기 보안여과기(50)에 연결되며, 상기 제1 고압펌프(62)는 상기 제5 공급관(61)에 구비된다.In addition, the first reverse osmosis membrane 60 is connected to the security filter 50 through a fifth supply pipe 61, and the first high pressure pump 62 is provided in the fifth supply pipe 61.

상기 보안여과기(50)는 공극 5~25㎛인 여과천을 이용한다.The security filter 50 uses a filter cloth having a void of 5 to 25 μm.

상기 1차 역삼투여과막(60)은 유입압력은 동절기 10~14bar, 기타절기9~13bar이고, 표준염제거율은 99%이상이며, 회수율은 62~66%로 하여 용수를 생산하도록 구성된다.The primary reverse osmosis filtration membrane 60 is configured to produce water with an inlet pressure of 10 to 14 bar in winter and 9 to 13 bar in other seasons, a standard salt removal rate of 99% or more, and a recovery rate of 62 to 66%.

이때, 상기 1차 역삼투여과막(60)은 제1 연결관(101)을 통해 상기 폐수처리장으로 연결되어, 상기 1차 역삼투여과단계(B)에서 1차 역삼투여과막(60)을 통과하지 못한 여과수는 상기 제1 연결관(101)을 통해 폐수처리장으로 유입되도록 구성된다.At this time, the first reverse osmosis filtration membrane 60 is connected to the wastewater treatment plant through the first connection pipe 101, and does not pass through the first reverse osmosis filtration membrane 60 in the first reverse osmosis filtration step (B). The filtered water is configured to flow into the wastewater treatment plant through the first connection pipe 101.

그리고, 상기 1차 역삼투여과단계(B)에서는 오염물질을 제거하기 위하여, 2차 역삼투여과단계(D)에서 생산된 투과수에, 유기세척제로서 에틸렌디아민테트라아세트산테트라나트륨염사수화물 및 수산화나트륨과, 무기세척제로서는 염화수소를 혼합하여 사용한다.And, in the first reverse osmosis filtration step (B), in order to remove contaminants, in the permeated water produced in the second reverse osmosis filtration step (D), ethylenediamine tetraacetate tetrasodium salt tetrahydrate and sodium hydroxide as organic detergents, As an inorganic detergent, hydrogen chloride is mixed and used.

즉, 상기 2차 역삼투여과단계(D)에서 생산된 투과수에 유기세척제와 무기세척제를 혼합하여, 상기 1차 역삼투여과막(60)에 공급함으로써, 1차 역삼투여과막(60)에 있는 오염물질이 제거되도록 한다.That is, by mixing an organic detergent and an inorganic detergent with the permeated water produced in the second reverse osmosis filtration step (D) and supplying it to the first reverse osmosis filtration membrane 60, contamination in the first reverse osmosis filtration membrane 60 Let the material be removed.

이와 같이, 오염물질을 제거하는 작업은 월 1회 또는 1차 역삼투여과막(60)의 유입압력이 동절기 14bar, 기타절기 13bar 이상일 경우 실시한다.As such, the work of removing contaminants is performed once a month or when the inlet pressure of the primary reverse osmosis filtration membrane 60 is 14 bar in winter and 13 bar in other seasons.

상기 2차 역삼투여과단계(D)는 상기 탈탄산단계(C)를 통과한 용수를 제2 고압펌프(72)를 이용하여 폴리아마이드계 2차 역삼투여과막(70)을 통과시켜 용수에 포함된 잔여 무기성 이온을 재차 분리 제거하는 단계이다.In the second reverse osmosis filtration step (D), the water that has passed through the decarboxylation step (C) is passed through a polyamide-based secondary reverse osmosis filtration membrane 70 using a second high pressure pump 72 to be included in the water. This is a step of separating and removing the remaining inorganic ions again.

이때, 상기 2차 역삼투여과막(70)은 제6 공급관(71)을 통해 상기 1차 역삼투여과막(60)에 연결되며, 상기 제2 고압펌프(72)는 상기 제6 공급관(71)에 구비된다.At this time, the secondary reverse osmosis membrane 70 is connected to the primary reverse osmosis membrane 60 through a sixth supply pipe 71, and the second high pressure pump 72 is connected to the sixth supply pipe 71. It is equipped.

상기 2차 역삼투여과막(70)은 유입압력은 동절기 6~9bar, 기타절기 5~8bar이고, 회수율은 88~92%로 구성된다.The secondary reverse osmosis filtration membrane 70 has an inlet pressure of 6 to 9 bar in winter and 5 to 8 bar in other seasons, and a recovery rate of 88 to 92%.

그리고, 상기 2차 역삼투여과단계(D)에서, 1차 역삼투여과단계(B)에서 생산된 용수에 수산화나트륨을 공급하여, 2차 역삼투여과단계(D)에서의 유기물 파울링을 줄이며 용해된 CO2를 HCO3-로 치환하여 상기 전기탈이온장치(90)에 적합한 투과수를 생산도록 한다.And, in the second reverse osmosis filtration step (D), sodium hydroxide is supplied to the water produced in the first reverse osmosis filtration step (B) to reduce organic matter fouling in the second reverse osmosis filtration step (D) and dissolved CO2 Is substituted with HCO3- to produce permeated water suitable for the electrodeionization device 90.

이때, 상기 제6 공급관(71)을 통과하는 용수에 수산화나트륨을 공급하는 방법이 이용될 수 있다.In this case, a method of supplying sodium hydroxide to the water passing through the sixth supply pipe 71 may be used.

또한, 상기 2차 역삼투여과단계(D)에서는 오염물질을 제거하기 위하여, 상기 2차 역삼투여과단계(D)에서 생산된 투과수에, 유기세척제로서 에틸렌디아민테트라아세트산테트라나트륨염사수화물 및 수산화나트륨과, 무기세척제로서 염화수소를 혼합하여 사용한다.In addition, in the second reverse osmosis filtration step (D), in order to remove contaminants, in the permeated water produced in the second reverse osmosis filtration step (D), ethylenediamine tetraacetate tetrasodium salt tetrahydrate and sodium hydroxide as organic detergents , As an inorganic cleaner, hydrogen chloride is mixed and used.

즉, 상기 2차 역삼투여과단계(D)에서 생산된 투과수에 유기세척제와 무기세척제를 혼합하여, 상기 2차 역삼투여과막(70)에 공급함으로써, 2차 역삼투여과막(70)에 있는 오염물질이 제거되도록 한다.That is, by mixing an organic detergent and an inorganic detergent with the permeated water produced in the second reverse osmosis filtration step (D) and supplying it to the second reverse osmosis filtration membrane 70, contamination in the second reverse osmosis filtration membrane 70 Let the material be removed.

이와 같이, 오염물질을 제거하는 작업은 3개월에 1회 또는 상기 2차 역삼투여과막(70)의 유입압력이 동절기 9bar, 기타절기 8bar 이상일 경우 실시한다.In this way, the operation of removing contaminants is performed once every three months or when the inlet pressure of the secondary reverse osmosis filtration membrane 70 is 9 bar in winter and 8 bar in other seasons.

상기 순수생산단계(E)는 상기 2차 역삼투여과단계(D)를 통과한 투과수를 투과수저장조(80)에 저장한 후, 제3 공급펌프(92)를 통해 전기탈이온장치(90)에 공급하여 전류를 이용하여 잔여 이온을 최종처리하여 순수를 생산하는 단계이다.In the pure water production step (E), after storing the permeated water passing through the secondary reverse osmosis filtration step (D) in the permeated water storage tank 80, the electric deionization device 90 through a third supply pump 92 It is a step of supplying to and finally processing residual ions using current to produce pure water.

상기 투과수저장조(80)은 제7 공급관(81)을 통해 상기 2차 역삼투여과막(70)에 연결되고, 상기 전기탈이온장치(90)는 제8 공급관(91)을 통해 상기 투과수저장소(80)에 연결되며, 상기 제3 공급펌프(92)는 상기 제8 공급관(91)에 구비된다.The permeate storage tank 80 is connected to the secondary reverse osmosis filtration membrane 70 through a seventh supply pipe 81, and the electrodeionization device 90 is the permeate storage tank through an eighth supply pipe 91. It is connected to 80, and the third supply pump 92 is provided in the eighth supply pipe 91.

이때, 상기 전기탈이온장치(90)는 양극과 음극 사이에 양이온과 음이온 교환 멤브레인을 교대로 배열하여 희석실과 농축실, 전해액실로 구성되며, 희석실에 충진된 양이온교환수지와 음이온교환수지에 직류전압을 가하여 적용된 DC전위에 의해 희석실에 있는 이온들이 막을 통과하여 농축실로 이동하게 되고 물은 희석실을 통해 계속 흐르며 이온들이 점점 제거되어 순수를 생산도록 구성된다.At this time, the electric deionization device 90 is composed of a dilution chamber, a concentration chamber, and an electrolyte chamber by alternately arranging cation and anion exchange membranes between the anode and the cathode, and direct current to the cation exchange resin and anion exchange resin filled in the dilution chamber. The ions in the dilution chamber pass through the membrane and move to the concentration chamber by the DC potential applied by applying a voltage, and water continues to flow through the dilution chamber, and the ions are gradually removed to produce pure water.

그리고, 상기 순수생산단계(E)에서는 오염물질을 제거하기 위하여, 순수생산단계(E)에서 생산된 순수에, 유기세척제로 염화나트륨 및 수산화나트륨과, 무기세척제로서는 염화수소를 혼합하여 사용한다.And, in the pure water production step (E), in order to remove contaminants, the pure water produced in the pure production step (E) is mixed with sodium chloride and sodium hydroxide as an organic detergent, and hydrogen chloride as an inorganic detergent.

즉, 상기 전기탈이온장치(90)를 통과하여 생산된 순수에 유기세척제와 무기세척제를 혼합하여 상기 전기탈이온장치(90)에 공급함으로써, 전기탈이온장치(90)에 있는 오염물질이 제거되도록 한다.That is, contaminants in the electrodeionizer 90 are removed by mixing an organic detergent and an inorganic detergent with pure water produced through the electrodeionizer 90 and supplying it to the electrodeionizer 90. Make it possible.

이와 같이, 오염물질을 제거하는 작업은 약 6개월에 1회 실시한다.In this way, the work of removing contaminants is carried out about once every 6 months.

한편, 상기 2차 역삼투여과막(70)과 전기탈이온장치(90)는 제2 연결관(102)을 통해 상기 여과수저장조(40)에 연결되어, 2차 역삼투여과막(70)을 통과하지 못하거나, 상기 순수생산단계(E)의 전기탈이온장치(90)를 통과하지 못한 용수 또는 투과수는 상기 제2 연결관(102)을 통해 여과수저장조(40)로 순환되도록 구성된다.Meanwhile, the secondary reverse osmosis filtration membrane 70 and the electrodeionization device 90 are connected to the filtered water storage tank 40 through a second connection pipe 102 and do not pass through the secondary reverse osmosis filtration membrane 70. The water or permeated water that has not passed through the electric deionization device 90 of the pure water production step (E) is configured to be circulated to the filtered water storage tank 40 through the second connection pipe 102.

이와 같은 전기탈이온장치를 이용한 폐수 처리수 재이용 순수생산 방법에 따르면, 폐수처리장에서 배출된 방류수는 상기 방류수저장조(10)에 저장된 후, 자동여과기(20)와 중공사막(30)을 통과하면서 전처리되고, 상기 여과수저장조(40)에 저장된 후, 보안여과기(50)와 1차 역삼투여과막(60)을 통과하면서 1차 역삼투여과되고, 탈탄산과정을 거친 후, 상기 2차 역삼투여과막(70)을 통과하면서 2차 역삼투여과되고, 상기 투과수저장조(80)에 저장된 후 상기 전기탈이온장치(90)를 통과하여 순수로 정제되어 배출된다.According to such a pure water production method for recycling wastewater treated water using an electric deionization device, the effluent discharged from the wastewater treatment plant is stored in the effluent storage tank 10 and then passes through the automatic filter 20 and the hollow fiber membrane 30 for pretreatment. And, after being stored in the filtered water storage tank 40, the first reverse osmosis is filtered while passing through the security filter 50 and the first reverse osmosis filtration membrane 60, and after undergoing a decarboxylation process, the second reverse osmosis filtration membrane 70 ) While passing through the secondary reverse osmosis, stored in the permeate storage tank 80, and then passed through the electric deionization device 90 to be purified into pure water and discharged.

따라서, 효과적으로 순수를 생산할 수 있는 장점이 있다.Therefore, there is an advantage of being able to effectively produce pure water.

그리고, 상기 1차 역삼투여과단계(B)에서 1차 역삼투여과막(60)을 통과하지 못한 여과수는 제1 연결관(101)을 통해 폐수처리장으로 유입되고, 상기 2차 역삼투여과단계(D)의 2차 역삼투여과막(70)을 통과하지 못하거나, 상기 순수생산단계(E)의 전기탈이온장치(90)를 통과하지 못한 용수 또는 투과수는 상기 여과수저장조(40)로 순환됨으로, 2차 역삼투여과막(70) 및 전기탈이온장치(90)에서 배출되는 용수 또는 투과수를 재처리함으로써, 용수 또는 투과수를 폐기함에 따라 발생되는 폐수의 발생량을 최소화할 수 있는 장점이 있다.And, the filtered water that did not pass through the first reverse osmosis filtration membrane 60 in the first reverse osmosis filtration step (B) is introduced into the wastewater treatment plant through the first connection pipe 101, and the second reverse osmosis filtration step (D) The water or permeated water that does not pass through the secondary reverse osmosis filtration membrane 70 of or does not pass through the electric deionization device 90 of the pure water production step (E) is circulated to the filtered water storage tank 40, 2 By reprocessing the water or permeated water discharged from the secondary reverse osmosis membrane 70 and the electrodeionization device 90, there is an advantage of minimizing the amount of wastewater generated as the water or permeated water is disposed.

본 실시예의 경우, 상기 1차 역삼투여과막(60)은 제1 연결관(101)을 통해 상기 폐수처리장으로 연결된 것을 예시하였으나, 상기 제1 연결관(101)은 별도의 폐수관에 연결되어, 1차 역삼투여과막(60)을 통과하지 못한 여과수는 폐수관을 통해 폐기되도록 할 수 있다.In the present embodiment, the primary reverse osmosis filtration membrane 60 has been illustrated to be connected to the wastewater treatment plant through the first connection pipe 101, but the first connection pipe 101 is connected to a separate wastewater pipe, Filtered water that has not passed through the primary reverse osmosis filtration membrane 60 may be disposed of through a waste water pipe.

A. 전처리단계 B. 1차 역삼투여과단계
C. 탈탄산단계 D. 2차 역삼투여과단계
E. 순수생산단계A. Pretreatment step B. 1st reverse osmosis filtration step
C. Decarbonation step D. Second reverse osmosis filtration step
E. Pure production stage

Claims (14)

폐수처리장에서 방류된 방류수를 제1 공급펌프(22)를 통해 자동여과기(20)로 유입시켜, 방류수에 포함되어 있는 부유물질을 여과 제거하고, 자동여과기(20)를 통과한 여과수를 중공사막(30)에 투과시켜 여과수에 포함된 고분자 유기물 및 콜로이드성 현탁물질, 미생물, 단백질성물질을 분리 제거하는 전처리단계(A)와,
상기 전처리단계(A)의 전처리를 거친 여과수를 여과수저장조(40)에 저장한 후 제2 공급펌프(52)를 통해 보안여과기(50)로 유입시켜 이물질을 제거하고 이물질이 제거된 여과수를 제1 고압펌프(62)를 이용하여 평막형태의 폴리아마이드계 1차 역삼투여과막(60)을 투과시켜 무기성 이온과 저분자 유기물을 분리 제거하여 용수를 생산하는 1차 역삼투여과단계(B)와,
상기 1차 역삼투여과단계(B)의 용수를 pH 8~10으로 조정하여 용수에 포함된 이산화탄소를 제거하는 탈탄산단계(C)와,
상기 탈탄산단계(C)를 통과한 용수를 제2 고압펌프(72)를 이용하여 폴리아마이드계 2차 역삼투여과막(70)을 통과시켜 용수에 포함된 잔여 무기성 이온을 재차분리 제거하는 2차 역삼투여과단계(D)와,
상기 2차 역삼투여과단계(D)를 통과한 투과수를 투과수저장조(80)에 저장한 후 제3 공급펌프(92)를 통해 전기탈이온장치(90)에 공급하여 전류 및 이온교환수지를 이용하여 잔여 이온을 최종처리하여 순수를 생산하는 순수생산단계(E)를 포함하되,
전처리 과정에서는 중공사막(30)을 보호하기 위해 비산화성 살균제로서 질산 마그네슘과 클로로메틸 이소티아졸을 사용하며,
상기 중공사막(30)의 유입압력은 동절기 1.2bar 이하, 기타절기 0.9bar 이하이고, 역세척은 30분 1회, 주기적으로 실시하나, 중공사막(30)을 통과한 여과수의 양이 부족할 경우 여과수저장조(40)가 50%이상 충수 되었을 경우 실시하며, 중공사막(30)을 통과한 여과수와 공기를 병행하여 실시하고,
상기 1차 역삼투여과단계(B)의 보안여과기(50)는 공극 5~25㎛인 여과천을 이용하며, 상기 1차 역삼투여과막(60)의 유입압력은 동절기 10~14bar, 기타절기 9~13bar이고, 표준염제거율은 99%이상이며, 회수율은 62~66%로 하여 용수를 생산하고,
상기 2차 역삼투여과단계(D)에서는 오염물질을 제거하기 위하여, 상기 2차 역삼투여과단계(D)에서 생산된 투과수에 유기세척제로서 에틸렌디아민테트라아세트 산테트라나트륨염사수화물 및 수산화나트륨과, 무기세척제로서 염화수소를 혼합하여 사용하며, 3개월에 1회 또는 상기 2차 역삼투여과막(70)의 유입압력이 동절기 9bar 이상, 기타절기 8bar 이상일 경우 실시하는 것을 특징으로 하는 전기탈이온장치를 이용한 폐수 처리수 재이용 순수생산 방법.
The discharged water discharged from the wastewater treatment plant is introduced into the automatic filter 20 through the first supply pump 22, the suspended matter contained in the discharged water is filtered off, and the filtered water that has passed through the automatic filter 20 is passed through a hollow fiber membrane ( A pretreatment step (A) of separating and removing polymer organic matter, colloidal suspension, microorganism, and proteinaceous material contained in the filtered water by permeating through 30),
The filtered water that has undergone the pretreatment of the pretreatment step (A) is stored in the filtered water storage tank 40, and then introduced into the security filter 50 through the second supply pump 52 to remove foreign substances, and the filtered water from which the foreign substances have been removed is first supplied. The first reverse osmosis filtration step (B) of producing water by separating and removing inorganic ions and low molecular organic substances by permeating the flat-membrane type polyamide-based primary reverse osmosis membrane 60 using a high pressure pump 62, and
A decarboxylation step (C) of removing carbon dioxide contained in the water by adjusting the water of the first reverse osmosis filtration step (B) to a pH of 8 to 10, and
2 to separate and remove the remaining inorganic ions contained in the water by passing the water that has passed through the decarboxylation step (C) through a polyamide-based secondary reverse osmosis filtration membrane 70 using a second high pressure pump 72 Second reverse osmosis filtration step (D) and,
After the permeated water that has passed through the second reverse osmosis filtration step (D) is stored in the permeated water storage tank 80, it is supplied to the electric deionization device 90 through the third supply pump 92 to collect current and ion exchange resin. Including a pure water production step (E) of producing pure water by final treatment of residual ions using,
In the pretreatment process, magnesium nitrate and chloromethyl isothiazole are used as non-oxidizing disinfectants to protect the hollow fiber membrane 30,
The inlet pressure of the hollow fiber membrane 30 is 1.2 bar or less in winter and 0.9 bar or less in other seasons, and backwashing is performed once for 30 minutes, but periodically, if the amount of filtered water passing through the hollow fiber membrane 30 is insufficient, filtered water It is carried out when the storage tank 40 is filled with 50% or more, and carried out in parallel with the filtered water and air that have passed through the hollow fiber membrane 30,
The security filter 50 of the first reverse osmosis filtration step (B) uses a filter cloth having a void of 5 to 25 µm, and the inlet pressure of the first reverse osmosis filtration membrane 60 is 10 to 14 bar in winter, 9 to other seasons. 13 bar, standard salt removal rate is over 99%, and recovery rate is 62 to 66% to produce water,
In the second reverse osmosis filtration step (D), in order to remove contaminants, ethylenediaminetetraacetate tetrasodium salt tetrahydrate and sodium hydroxide as an organic cleaning agent in the permeated water produced in the second reverse osmosis filtration step (D), and inorganic Wastewater using an electric deionization device, characterized in that hydrogen chloride is mixed and used as a cleaning agent, and is carried out once every 3 months or when the inlet pressure of the secondary reverse osmosis membrane 70 is 9bar or more in winter and 8bar in other seasons. Pure water production method for reuse of treated water.
 제 1항에 있어서,
상기 1차 역삼투여과단계(B)에서 1차 역삼투여과막(60)을 통과하지 못한 여과수는 별도의 배수관로 또는 폐수처리장으로 유입시키도록 된 것을 특징으로 하는 전기탈이온장치를 이용한 폐수 처리수 재이용 순수생산 방법.
The method of claim 1,
Reuse of wastewater treated water using an electric deionizer, characterized in that the filtered water that did not pass through the first reverse osmosis filtration membrane 60 in the first reverse osmosis filtration step (B) is introduced into a separate drain pipe or wastewater treatment plant. Pure production method.
 제 1항에 있어서,
상기 2차 역삼투여과단계(D)의 2차 역삼투여과막(70)을 통과하지 못하거나, 상기 순수생산단계(E)의 전기탈이온장치(90)를 통과하지 못한 용수 또는 투과수는 상기 여과수저장조(40)로 순환되는 것을 특징으로 하는 전기탈이온장치를 이용한 폐수 처리수 재이용 순수생산 방법.
The method of claim 1,
The water or permeated water that fails to pass through the second reverse osmosis filtration membrane 70 of the second reverse osmosis filtration step (D) or does not pass through the electrodeionization device 90 of the pure production step (E) is the filtered water. Pure water production method for recycling wastewater treated water using an electric deionization device, characterized in that circulated to the storage tank 40.
 삭제delete 제 1항에 있어서,
상기 중공사막(30)은 폴리불화비닐재질 멤브레인 형태의 0.01㎛ 공경의 가압형 분리막을 이용하며, 설치 규모는 직경 216mm, 높이 2160mm의 1조당 30기 이상을 장착하여 2조 이상 설치된 것을 특징으로 하는 전기탈이온장치를 이용한 폐수 처리수 재이용 순수생산 방법.
The method of claim 1,
The hollow fiber membrane 30 uses a pressure-type separator with a pore diameter of 0.01 μm in the form of a polyvinyl fluoride membrane, and the installation scale is characterized in that at least 2 sets are installed with 30 units or more per unit having a diameter of 216 mm and a height of 2160 mm. Pure water production method for recycling wastewater treated water using an electric deionization device.
 삭제delete 제 1항에 있어서,
상기 전처리단계(A)에서는 오염물질을 제거하기 위하여, 2차 역삼투여과단계(D)에서 생산된 투과수에, 유기세척제로 차아염소산나트륨 및 수산화나트륨과, 무기세척제로서는 염화수소와 구연산을 혼합하여 사용하며, 3개월에 1회 또는 중공사막(30)의 유입압력이 동절기 1.2bar 초과, 기타절기 0.9bar 초과일 경우 실시하는 것을 특징으로 하는 전기탈이온장치를 이용한 폐수 처리수 재이용 순수생산 방법.
The method of claim 1,
In the pretreatment step (A), in order to remove contaminants, a mixture of sodium hypochlorite and sodium hydroxide as an organic detergent and hydrogen chloride and citric acid as an inorganic detergent is used in the permeated water produced in the second reverse osmosis filtration step (D). And, once every three months or when the inlet pressure of the hollow fiber membrane 30 exceeds 1.2bar in winter and 0.9bar in other seasons, a pure water production method for recycling wastewater treated water using an electric deionizer, characterized in that.
 삭제delete 제 1항에 있어서,
상기 1차 역삼투여과단계(B)에서는 오염물질을 제거하기 위하여, 2차 역삼투여과단계(D)에서 생산된 투과수에, 유기세척제로서 에틸렌디아민테트라아세트산테트라나트륨염사수화물 및 수산화나트륨과, 무기세척제로서는 염화수소를 혼합하여 사용하며, 월 1회 또는 1차 역삼투여과막(60)의 유입압력이 동절기 14bar 이상, 기타절기 13bar 이상일 경우 실시하는 것을 특징으로 하는 전기탈이온장치를 이용한 폐수 처리수 재이용 순수생산 방법.
The method of claim 1,
In the first reverse osmosis filtration step (B), in order to remove contaminants, in the permeated water produced in the second reverse osmosis filtration step (D), ethylenediamine tetraacetate tetrasodium salt tetrahydrate and sodium hydroxide as organic cleaning agents, and inorganic cleaning agents Hydrogen chloride is mixed and used once a month or when the inlet pressure of the primary reverse osmosis filtration membrane (60) is 14 bar or more in winter and 13 bar or more in other seasons. Production method.
 제 1항에 있어서,
상기 2차 역삼투여과막(70)의 유입압력은 동절기 6~9bar, 기타절기 5~8bar이고, 회수율은 88~92%인 것을 특징으로 하는 전기탈이온장치를 이용한 폐수 처리수 재이용 순수생산 방법.
The method of claim 1,
The inlet pressure of the secondary reverse osmosis filtration membrane 70 is 6 to 9 bar in winter and 5 to 8 bar in other seasons, and the recovery rate is 88 to 92%.
 제 1항에 있어서,
상기 2차 역삼투여과단계(D)에서, 1차 역삼투여과단계(B)에서 생산된 용수에 수산화나트륨을 공급하여, 2차 역삼투여과단계(D)에서의 유기물 파울링을 줄이며 용해된 CO2를 HCO3-로 치환하여 상기 전기탈이온장치(90)에 적합한 투과수를 생산하는 것을 특징으로 하는 전기탈이온장치를 이용한 폐수 처리수 재이용 순수생산 방법.
The method of claim 1,
In the second reverse osmosis filtration step (D), sodium hydroxide is supplied to the water produced in the first reverse osmosis filtration step (B), thereby reducing organic matter fouling in the second reverse osmosis filtration step (D) and dissolving CO2 into HCO3. Pure water production method for recycling wastewater treated water using an electrodeionizer, characterized in that by replacing with-to produce permeated water suitable for the electrodeionization device 90.
 삭제delete 제 1항에 있어서,
상기 전기탈이온장치(90)는 양극과 음극 사이에 양이온과 음이온 교환 멤브레인을 교대로 배열하여 희석실과 농축실, 전해액실로 구성되며, 희석실에 충진된 양이온교환수지와 음이온교환수지에 직류전압을 가하여 적용된 DC전위에 의해 희석실에 있는 이온들이 막을 통과하여 농축실로 이동하게 되고 물은 희석실을 통해 계속 흐르며 이온들이 점점 제거되어 순수를 생산하는 것을 특징으로 하는 전기탈이온장치를 이용한 폐수 처리수 재이용 순수생산 방법.
The method of claim 1,
The electrodeionization device 90 is composed of a dilution chamber, a concentration chamber, and an electrolyte chamber by alternately arranging cation and anion exchange membranes between an anode and a cathode, and applies a DC voltage to the cation exchange resin and anion exchange resin filled in the dilution chamber. Wastewater treatment water using an electric deionizer characterized in that ions in the dilution chamber pass through the membrane and move to the concentration chamber by the applied DC potential, and water continues to flow through the dilution chamber, and ions are gradually removed to produce pure water. Reuse pure production method.
 제 1항에 있어서,
상기 순수생산단계(E)에서는 오염물질을 제거하기 위하여, 순수생산단계(E)에서 생산된 순수에, 유기세척제로 염화나트륨 및 수산화나트륨과, 무기세척제로서는 염화수소를 혼합하여 사용하며, 6개월에 1회 실시하는 것을 특징으로 하는 전기탈이온장치를 이용한 폐수 처리수 재이용 순수생산 방법.The method of claim 1,
In the pure production step (E), in order to remove contaminants, the pure water produced in the pure production step (E) is mixed with sodium chloride and sodium hydroxide as an organic detergent, and hydrogen chloride as an inorganic detergent. Pure water production method for recycling wastewater treated water using an electric deionization device, characterized in that it is carried out twice.
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