KR0135465B1 - Membrane washing apparatus of complex watse waste - Google Patents
Membrane washing apparatus of complex watse wasteInfo
- Publication number
- KR0135465B1 KR0135465B1 KR1019940034558A KR19940034558A KR0135465B1 KR 0135465 B1 KR0135465 B1 KR 0135465B1 KR 1019940034558 A KR1019940034558 A KR 1019940034558A KR 19940034558 A KR19940034558 A KR 19940034558A KR 0135465 B1 KR0135465 B1 KR 0135465B1
- Authority
- KR
- South Korea
- Prior art keywords
- membrane
- cleaning
- separation membrane
- compartment
- reverse osmosis
- Prior art date
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Classifications
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/02—Reverse osmosis; Hyperfiltration ; Nanofiltration
- B01D61/025—Reverse osmosis; Hyperfiltration
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/14—Ultrafiltration; Microfiltration
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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
- C02F1/44—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
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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
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Water Supply & Treatment (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Organic Chemistry (AREA)
- Nanotechnology (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
본 발명은 분리막을 통과하여 여과된 투과수가 집수되는 세정탱크를 2개의 함실로 구성하고 이 세정탱크에 집수된 투과수로 분리막의 역세 및 세정작업을 수행할 수 있는 복합폐수처리장치의 분리막 세정장치에 관한 것으로, 특히 유입펌프를 통해 유입되어서 여과탑과 정밀여과기 및 한외여과막과 역삼투막으로된 부니막을 순차통과하는 폐수를 여과처리하는 복합폐수처리장치에 있어서, 상기 역삼투막으로된 분리막을 통과하여 여과되어 세정탱크에 집수된 투과수를 상기 분리막과 한외여과막으로된 분리막의 역세 및 세정작업을 수행할 수 있는 것을 특징으로 하는 복합폐수처리장치의 분리막 세정장치.The present invention is composed of two chambers of the cleaning tank to collect the permeated water filtered through the separation membrane and the separation membrane cleaning device of the composite wastewater treatment apparatus capable of backwashing and cleaning the separation membrane with the permeated water collected in the cleaning tank. In particular, in the composite wastewater treatment apparatus for filtering the wastewater introduced through the inlet pump and sequentially passed through the filtration tower, the microfiltration membrane and the uninet membrane of the ultrafiltration membrane and the reverse osmosis membrane, which is filtered through the separation membrane of the reverse osmosis membrane Separation membrane cleaning device for a composite wastewater treatment device, characterized in that backwashing and cleaning of the separation membrane consisting of the separation membrane and the ultrafiltration membrane to the permeated water collected in the cleaning tank.
Description
제1도는 본 발명에 따른 공정도.1 is a process diagram according to the present invention.
제2도는 본 발명에 따른 세정탱크의 일실시예.2 is an embodiment of a cleaning tank according to the present invention.
제3도는 본 발명에 따른 세정탱크의 다른 실시예.3 is another embodiment of a cleaning tank according to the present invention.
제4도는 종래의 분리막을 조합한 폐수처리공정도.4 is a wastewater treatment process diagram combining a conventional separator.
제5도는 종래의 역삼투락을 이용한 폐수처리공정도.5 is a wastewater treatment process using a conventional reverse osmosis.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
40 : 가열장차 200 : 저장겸 세정탱크40: heating vehicle 200: storage and cleaning tank
320 : 저면판 330 : 함실320: bottom plate 330: compartment
400, 410 : 배수연결공400, 410: drainage hole
본 발명은 분리막을 이용한 복합폐수처리장치에 관련된 것으로, 특히 분리막을 통과하여 여과된 투과수가 집수되는 세정탱크를 2개의 함실로 구성하고 이 세정탱크에 집수된 투과수로 분리막의 역세 및 세정작업을 수행할 수 있는 복합폐수처리장치의 분리막 세정장치에 관한 것이다.The present invention relates to a complex wastewater treatment apparatus using a separation membrane, in particular, consisting of two chambers of the cleaning tank for collecting the permeate filtered through the separation membrane and the backwashing and cleaning of the separation membrane with the permeate collected in the cleaning tank It relates to a membrane cleaning device of a complex wastewater treatment device that can be performed.
일반적으로 한외여과막, 역삼투막으로된 분리막을 사용하여 장치에서는 그 사용빈도에 따라서 분리막의 투과유량이 현저히 감소하여 통상적으로 분리막의 역세 및 세정장치를 구성하여 주기적으로 또는 필요에 따라서 역세 및 세정공정을 수행하고 있다.In general, in the apparatus using an ultrafiltration membrane and a reverse osmosis membrane, the permeate flow rate of the membrane is remarkably reduced according to the frequency of use thereof, and thus, the backwashing and washing apparatus of the membrane is usually configured to perform the backwashing and washing process periodically or as necessary. Doing.
종래의 공정은 제4도 및 제5도에 도시되어 있는데, 이 공정은 두종류(한외여과막, 역삼투막)의 분리막을 조합한 경우로 분리막(12)만을 역세할때에는 별도의 역세장치를 연결하여 역세하거나 도는 분리막(1)의 세정장치(2)(4)(5)(6)를 이용하여 세정액(3)을 개폐밸브(13)를 개방하여 파이프(7)를 통해 분리막(12)으로 통과시켜 역세를 하는 것으로, 이때 개폐밸브(14)는 폐쇄하고 개폐밸브(16)은 개방하여야 한다.The conventional process is shown in FIGS. 4 and 5, which combine two kinds of membranes (ultrafiltration membrane, reverse osmosis membrane). When backwashing only the membrane 12, a separate backwashing device is connected to backwash. The cleaning liquid 3 is passed through the pipe 7 through the pipe 7 to the separation membrane 12 by using the cleaning device 2, 4, 5, and 6 of the separation membrane 1 or the separator 1. Backwashing, the on-off valve 14 must be closed and the on-off valve 16 must be open.
이 장치에 사용되는 기기중 부호(19)는 저장탱크(22)는 여과탑(23)은 정밀여과기(30)은 가변펌프(21)은 유압펌프이다.In the apparatus used for this apparatus, the code | symbol 19 is the storage tank 22, the filtration tower 23, the precision filter 30, the variable pump 21, and the hydraulic pump.
한편 분리막(1)을 세정할 때에는 세정액(3)을 가열장치(4)로 적정온도까지 올리고 세정장치(2)(4)(5)(6)를 이용하여 개폐밸브(8)를 개방하여 파이프(7)에서 연결하여 분리막(1)으로 통과시켜 세정하는 것으로, 이때 개폐밸브(9)(17)(18)는 폐쇄하고 개폐밸브(10)(11)는 개방하는 공정으로 수행하여야 한다.On the other hand, when the separation membrane 1 is cleaned, the cleaning liquid 3 is heated to a suitable temperature by the heating device 4, and the opening / closing valve 8 is opened by using the cleaning devices 2, 4, 5 and 6 to pipe It is to be connected to (7) to pass through the separation membrane (1) to clean, at this time the on-off valves (9), (17) (18) is to be closed and the on / off valves (10) and (11) must be performed in the process of opening.
그리고 역삼투막을 이용한 공정은 역삼투막(1)의 세정작업은 별도의 세정탱크(2)로부터 세정액(3)을 가열장치(4)로 가열하여 적정온도로 맞춘후 세정펌프(5), 세정용 정밀여과기(6)를 통해 개폐밸브(8)를 개방하여 파이프(7)을 통해 역삼투막으로된 분리막(1)으로 유입시켜 세정하는 것으로, 이때 개폐밸브(9)는 폐쇄하고 개폐밸브(10)(11)는 개방하여야 한다.In the process using the reverse osmosis membrane, the cleaning operation of the reverse osmosis membrane (1) is performed by heating the cleaning liquid (3) with a heating device (4) from a separate cleaning tank (2) to a suitable temperature, followed by a cleaning pump (5) and a precision filter for cleaning. (6) to open and close the valve 8 through the pipe (7) flows into the separation membrane (1) of the reverse osmosis membrane to clean, at this time the on-off valve (9) is closed and the on-off valve (10) (11) Shall be open.
역삼투막을 사용하여 공정의 세정장치(Cleaning in Plant)는 탱크, 히터 또는 열교환기로된 가열장치, 펌프, 정밀여과기 등으로 구성되며 이러한 장치는 주 공정과는 별도의 공정으로 구성하는 것이 보통이므로 이에 따른 설치비용문제와 설치면적의 확보문제 그리고 분리막을 두 종류 이상 조합한 경우에 그 역세 및 세정을 위한 연계방법 등 고려해야 할 문제점이 있다.Cleaning in plant process using reverse osmosis membrane consists of a heating device, a pump, a precision filter, etc., which is composed of a tank, a heater or a heat exchanger. There are problems to be considered such as installation cost problem, securing of installation area, and linking method for backwashing and cleaning when two or more kinds of separators are combined.
본 발명의 상기와 같은 사정을 고려하여 창출된 것으로, 그 목적은 첫재, 한외여과막과 역사투막으로된 분리막을 하나의 공정내에서 개별적으로 또는 복합적으로 역세 및 세정이 가능하도록 하는 것과, 둘재, 세정탱크를 투과수저장겸 세정탱크로 겸용할 수 있는 복합폐수처리장치의 분리막 세정장치를 제공하는 것이다.It is created in view of the above circumstances of the present invention, and its object is to enable the backwashing and cleaning of the separation membrane consisting of the first material, the ultrafiltration membrane and the history permeable membrane separately or in a single process, and the second material and the cleaning. It is to provide a membrane cleaning device for a complex wastewater treatment device that can serve as a permeate storage and a cleaning tank.
본 발명은 상기와 같은 목적을 달성하기 위해 유압펌프를 통해 유입되어서 여과탑과 정밀여과기 및 한외여과막과 역삼투막으로된 분리막을 순차통과하는 폐수를 여과처리하는 복합폐수처리장치에 있어서, 상기 역삼투막으로된 분리막을 통과하여 여과되고 세정탱크에 집수된 투과수로 상기 분리막과 한외여과막으로된 분리막의 역세 및 세정작업을 수행할 수 있는 장치를 제공함에 의해 달성된다.In the present invention, in order to achieve the above object, in the composite wastewater treatment apparatus for filtering wastewater flowing through a separation tower consisting of a filtration tower and a microfiltration membrane and an ultrafiltration membrane and a reverse osmosis membrane in order to achieve the above object, the reverse osmosis membrane It is achieved by providing a device capable of backwashing and cleaning the separator consisting of the separator and the ultrafiltration membrane with permeate filtered through the separator and collected in the washing tank.
다음 본 발명의 실시예를 도면에 의거하여 구체적으로 설명하면 다음과 같다.Next, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.
먼저 제1도에는 본 발명에 따른 복합폐수처리장치의 분리막 세정장치에 다른 공정도가 도시되어 있는데, 이 분리막 세정장치는 한외여과막과 역삼투막으로된 분리막(10)(120)을 하나의 장치내에서 개별적 또는 복합적으로 역세 및 세정하도록 하였다.First, FIG. 1 shows another process diagram of the membrane cleaning apparatus of the complex wastewater treatment apparatus according to the present invention. The membrane cleaning apparatus separately separates membranes 10 and 120 made of ultrafiltration membranes and reverse osmosis membranes in one apparatus. Or combined backwashing and washing.
분리막(10)(120)의 역세 및 세정작업을 수행하기 위해 투과수(250)를 집수하는 과정은 폐수를 원수유입펌프(210), 여과탑(220), 정밀여과기(230), 개폐밸브(240)을 개방하여 통과여과시켜 저장겸 세정탱크(200)에 집수하거나 여과탑(220)과 정밀여과기(230)를 통과하지 않고 원수유입펌프(210)를 통해 개폐밸브(260)(270)(280)를 개방하여 분리막(120)을 통과 여과시켜 저장겸 세정탱크(200)로 집수한다.The process of collecting the permeate 250 to perform backwashing and cleaning operations of the separation membranes 10 and 120 may include wastewater as a raw water inflow pump 210, a filtration tower 220, a precision filter 230, and an open / close valve ( Opening and passing through the 240 to the storage and washing tank 200 to collect or pass through the filtration tower 220 and the precision filter 230 through the raw water inlet pump 210 without opening valve 260 (270) ( 280 is opened and filtered through the separation membrane 120 to be collected into the storage and cleaning tank 200.
이렇게 집수된 투과수(250)는 개폐밸브(290)의 개방과 가변펌프(유량·유압)의 동작으로 분리막(10)으로 통과시켜 분리된 초기의 투과수 일정량을 개폐밸브(310)를 개방하여 저장겸 세정탱크(200)에 집수하거나 여과탑(220)과 정밀여과기(230)를 통과하지 않고 원수유입펌프(120)을 통과 여과시켜 저장겸 세정탱크(200)로 집수한다.The permeated water 250 collected in this way passes through the separation membrane 10 by the operation of the opening / closing valve 290 and the variable pump (flow rate / hydraulic) to open the opening / closing valve 310 by opening a predetermined amount of permeated water separated therefrom. The water is collected in the storage and washing tank 200 or filtered through the raw water inflow pump 120 without passing through the filtration tower 220 and the precision filter 230 and collected in the storage and washing tank 200.
이렇게 집수된 투과수(250)는 개폐밸브(290)의 개방과 가변펌프(유량·유압)의 동작으로 분리막(10)으로 통과시켜 분리된 초기의 투과수 일정량을 개폐밸브(310)을 개방하여 저장겸 세정탱크(200)내의 함실(330)로 만수위가지 집수한다.The permeated water 250 collected in this way passes through the separation membrane 10 by the operation of the opening / closing valve 290 and the variable pump (flow rate / hydraulic) to open the opening / closing valve 310 by opening a predetermined amount of permeated water separated therefrom. Water level is collected into the compartment 330 in the storage and cleaning tank 200.
이대 개폐밸브(110)는 개방하고 개폐밸브(180)(340)(350)(370)는 폐쇄된다.The main shutoff valve 110 is opened and the shutoff valves 180, 340, 350 and 370 are closed.
함실(330)이 만수위가 되며 개폐밸브(310)은 폐쇄하고 개폐밸브(240)은 개방하여 개폐밸브(180)는 전환율(Conversion Rate)에 따라 개방 및 폐수 조작을 실시한다.The compartment 330 is at full water level, the on-off valve 310 is closed and the on-off valve 240 is opened to open and close the valve 180 according to the conversion rate.
이때 함실(330)에 집수된 투과수(250)는 분리막(10)(120)의 역세 및 세정작업을 위한 공정수로 사용되는 것으로, 우선 분리막(10)의 세정은 함실(330)에 집수된 투과수(250)를 가열장치(40)로 세정에 필요한 적정온도가지 올리고 개폐밸브(350)(360)를 개방하여, 개폐밸브(290)는 폐쇄하여 가변펌프(300)를 동작하여 분리막(10)으로 통과시켜 세정작업을 수행한다.At this time, the permeated water 250 collected in the compartment 330 is used as process water for backwashing and cleaning operations of the separation membranes 10 and 120. First, the cleaning of the separation membrane 10 is collected in the compartment 330. Raising the permeated water 250 to a suitable temperature necessary for cleaning the heating device 40, opening and closing valves 350 and 360 to open, the opening and closing valve 290 is closed to operate the variable pump 300 to separate the membrane 10 Pass through) to perform cleaning.
이 공정에서 개폐밸브(110)(340)는 개방하고 개폐밸브(180)(310)(270)는 폐쇄한다.In this process, the on / off valves 110 and 340 are opened and the on / off valves 180, 310 and 270 are closed.
이와같이 분리막(10)의 세정(Flushing 도는 Chemical Cleaning)은 분리막(10)을 통과하는 투과수(250)로 하는 것이 외부의 수원을 공급받아 세정을 실시하는 방법보다 세정액의 수질면에서 유리하며 세정효과도 우수하다.Thus, the cleaning (chemical cleaning) of the separation membrane 10 is advantageous in terms of water quality of the cleaning liquid than the method of performing permeation water 250 passing through the separation membrane 10 to perform the cleaning by receiving an external water source. Is also excellent.
분리막(120)의 역세는 함실(330)에서 투과수(250)를 가열장치(40)로 세정에 필요한 적정온도까지 올리면서 개폐밸브(350)(360)는 개방하고 개폐밸브(290)은 폐쇄하며 가변펌프(300)를 동작시켜 개폐밸브(370)를 개방함과 동시에 투과수(250)를 분리막(120)으로 유입시킨다.The backwash of the membrane 120 raises the permeated water 250 in the chamber 330 to the appropriate temperature for cleaning with the heating device 40 and opens and closes the valves 350 and 360 and closes the valves 290. In addition, the variable pump 300 is operated to open and close the valve 370, and at the same time, the permeate 250 is introduced into the separation membrane 120.
이때 개폐밸브(180)(270)(280)(380)는 폐쇄하고 개폐밸브(390)는 개방한다.At this time, the on / off valves 180, 270, 280 and 380 are closed and the on / off valve 390 is opened.
한편 분리막(10)(120)을 혼용하여 역세 및 세정작을 수행하는 공정은 격실(330)에서 투과수(250)를 가열장치(40)로 세정에 필요한 적정온도가지 올리고 개폐밸브(350)(360)는 개방하고 개폐밸브(290)는 폐쇄하며 가변펌프(300)를 동작시킴과 동시에 개폐밸브(370)(380)를 개방하여 투과수(250)를 분리막(10)(120)으로 유입시킨다.On the other hand, the process of performing backwashing and washing operation by mixing the membranes 10 and 120 is carried out to raise the appropriate temperature necessary for washing the permeate 250 in the compartment 330 with the heating device 40 and opening / closing valve 350 ( 360 opens and the on / off valve 290 closes and operates the variable pump 300 and simultaneously opens and closes the on / off valves 370 and 380 to introduce the permeate 250 into the separation membranes 10 and 120. .
이대 개폐밸브(180)(270)(280)(380)는 폐쇄하고 개폐밸브(110)(340)(390)는 개방시킨다.The main valves 180, 270, 280 and 380 are closed and the valves 110, 340 and 390 are opened.
제2도 및 제3도에는 본 발명에 따른 저장겸 세정탱크(200)는 종래의 저장탱크(19)와 세정탱크(2)를 하나의 탱크로 병합한 구성을 갖는다.2 and 3, the storage and cleaning tank 200 according to the present invention has a configuration in which the conventional storage tank 19 and the cleaning tank 2 are merged into one tank.
이 저장겸 세정탱크(200)는 상부의 높이가 서로같고 어느한족의 함실(30)이 다른함실에 포함되는 분할된 2개의 함실로 이루어지며 적은 함실(330)이 저면판(320)이 경사지게 설치되고 분리된 함실마다 가열장치(40)를 설치하여서 된 구성이다.The storage and cleaning tank 200 is composed of two compartments in which the height of the upper part is the same and the compartment 30 of a certain group is included in another compartment, and the lower compartment 330 is installed with the bottom plate 320 inclined. In this case, the heating device 40 is installed for each separate compartment.
이 저장겸 세정탱크(200)는 원형의 탱크 본체에서 저면판(320)과 새로운 함실(330)이 형태에 영향을 받지 않는 구성으로 함실(330)의 형상은 저면은 배수가 용이하게 경사지고 경사가 끝나는 부분과 저장겸 세정탱크(20)의 벽면의 만나는 부분에 배수를 용이하게 하기위한 배수 연결구(400)(410)를 설치하였다.The storage and cleaning tank 200 has a configuration in which the bottom plate 320 and the new compartment 330 are not affected by the shape of the circular tank body. At the end of the meeting portion and the wall portion of the storage and washing tank 20, the drain connector 400, 410 to facilitate the drainage was installed.
이 배수연결구(400)는 개폐밸브(390)(430)와 연결되고, 배수연결구(410)는 개폐밸브(290)와 연결되며, 저장겸 세정탱크(200)의 하부에 있는 배수연결구(420)는 개폐밸브(440)와 연결된다.The drain connector 400 is connected to the on-off valves 390 and 430, the drain connector 410 is connected to the on-off valve 290, the drain connector 420 in the lower portion of the storage and cleaning tank 200 Is connected to the on-off valve 440.
그리고 함실(330)이 저장용량은 저장겸 세정탱크(200)의 저장용량에 따라서 결정되나 가열장치(40)는 분리막(10)(120)의 세정에 필요한 최소한의 용량으로 결정된다.The storage capacity of the compartment 330 is determined according to the storage capacity of the storage and cleaning tank 200, but the heating device 40 is determined to be the minimum capacity required for cleaning the separation membranes 10 and 120.
따라서 함실(330)의 설치로 종래의 세정장치의 설치가 줄어들고 하나의 탱크로 용이한 장점이 있다.Therefore, the installation of the compartment 330 reduces the installation of the conventional cleaning device has the advantage of being easy to one tank.
이상에서와 같이 본 발명은 분리막의 세정공정은 기존의 세정공정을 보다 효율적으로 개선하여 설치비용 및 설치면적에 대한 부담을 줄인 경제적인 공정으로 전체공정의 컴팩트화가 가능하고 제어를 위한 개폐밸브의 작동을 자동 및 반자동으로 구성할 수 있으며 더욱이 두종류의 분리막의 역세 및 세정을 동시에 또는 각기 할 수 있음과 한외여과막, 역삼투막이외의 다른 종류의 분리막으로 대체 가능하여 다양한 종류의 폐수를 효율적으로 여과처리할 수 있다.As described above, in the present invention, the membrane washing process is an economical process that reduces the burden on the installation cost and the installation area by improving the existing washing process more efficiently. It can be configured automatically and semi-automatically. Moreover, backwashing and washing of two kinds of membranes can be done simultaneously or separately, and it can be replaced by other kinds of membranes other than ultrafiltration membranes and reverse osmosis membranes. Can be.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019940034558A KR0135465B1 (en) | 1994-12-16 | 1994-12-16 | Membrane washing apparatus of complex watse waste |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019940034558A KR0135465B1 (en) | 1994-12-16 | 1994-12-16 | Membrane washing apparatus of complex watse waste |
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| Publication Number | Publication Date |
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| KR960022268A KR960022268A (en) | 1996-07-18 |
| KR0135465B1 true KR0135465B1 (en) | 1998-04-23 |
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| KR1019940034558A KR0135465B1 (en) | 1994-12-16 | 1994-12-16 | Membrane washing apparatus of complex watse waste |
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| KR20020062213A (en) * | 2001-01-19 | 2002-07-25 | 이문희 | Liquid manure and biogas waste water treatment plant |
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