KR0124039B1 - Activated sludge process using ultrafiltration and concentrated oxygen - Google Patents

Activated sludge process using ultrafiltration and concentrated oxygen

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KR0124039B1
KR0124039B1 KR1019940026916A KR19940026916A KR0124039B1 KR 0124039 B1 KR0124039 B1 KR 0124039B1 KR 1019940026916 A KR1019940026916 A KR 1019940026916A KR 19940026916 A KR19940026916 A KR 19940026916A KR 0124039 B1 KR0124039 B1 KR 0124039B1
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activated sludge
oxygen
high concentration
concentration
concentrated
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KR1019940026916A
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KR960013998A (en
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조순행
김권일
김종남
유윤종
장미숙
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오정무
한국에너지기술연구소
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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
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/12—Activated sludge processes
    • C02F3/26—Activated sludge processes using pure oxygen or oxygen-rich gas
    • 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
    • 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
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

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

Abstract

preparing concentrated oxygens with 2-bed oxygens PSA charged with zeolite X at the oxygen concentration of 90-93% and a pressure of 0.7-1 kg/cm2; feeding the concentrated oxygens into a closed multistage active sludgy reactor to supply dissolved oxygens sufficient to maintain the high concentration of 3-15 g/l; and separating the active sludge with a tubular ultramicroscopic filter layer at a circulation linear rate of 1-3 m/s.

Description

농축산소와 한외여과막을 사용한 고농도 활성슬러지 폐수처리방법High concentration activated sludge wastewater treatment using concentrated oxygen and ultrafiltration membrane

제1도는 폐수처리용 2배드(Bed) 산소 PSA공정도.1 is a two-bed oxygen PSA process for wastewater treatment.

제2도는 농축산소와 한외여과막을 사용한 고농도 활성슬러지 공정도.2 is a high concentration activated sludge process using concentrated oxygen and ultrafiltration membrane.

제3도는 합성폐수 처리율과 활성슬러지 농도.3 shows synthetic wastewater treatment rate and activated sludge concentration.

* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings

SV : 솔레노이드 밸브 HC : 핸드 콘트롤 밸브SV: Solenoid Valve HC: Hand Control Valve

PR : 압력 레코딩 밸브 PG : 압력게이지PR: Pressure recording valve PG: Pressure gauge

FR : 프로어(FLOW) 레코딩 TR : 온도 레코딩FR: FLOW recording TR: Temperature recording

PC : 압력 콘트롤 밸브 UF : 울트라 필터PC: Pressure Control Valve UF: Ultra Filter

P1, P2, P3 : 워터 펌프 P4, P5, P6, P7 : 에어 펌프P1, P2, P3: Water Pump P4, P5, P6, P7: Air Pump

LT : 레벨 전달장치(TRANSMITTER)LT: Level Transmitter (TRANSMITTER)

본 발명은 고농도 유기폐수나 난분해성 산업폐수 등을 처리하기 위하여 산소 PSA(Pressure Swing Adsorption)를 이용한 산소농도 90% 이상의 농축산소를 이용하여 밀폐식 반응기에 산소를 공급하여 반응기 내의 활성슬러지 농도를 8-15g/ℓ 정도의 고농도로 유지하여 효율적으로 반응시키고 반응된 활성슬러지와 처리수는 한외여과막을 이용하여 고액 분리하므로서 고도의 처리효과를 얻고 처리수를 재활용할 수 있도록 하는 폐수처리 방법에 관한 것이다.The present invention supplies oxygen to a closed reactor by using concentrated oxygen of 90% or more of oxygen concentration using oxygen PSA (Pressure Swing Adsorption) to treat high concentration organic wastewater or hardly degradable industrial wastewater. The present invention relates to a wastewater treatment method which maintains a high concentration of about -15g / ℓ and reacts efficiently and reacts the activated sludge and treated water to obtain a high treatment effect by recycling the solid-liquid separation using an ultrafiltration membrane and to recycle the treated water. .

일반적인 활성슬러지를 이용한 폐수처리 공정에서는 압축공기를 이용하여 폭기를 하기 때문에 폭기조의 활성슬러지 농도를 2-4g/ℓ 정도로 유지하며 처리된 물과 활성슬러지는 침전조에서 침전 분리한 후에 농축된 슬러지는 다시 폭기조로 반송된다. 이러한 폐수처리장치에서는 통상 COD(화학적 산소 요구량) 200-300ppm 정도의 유기오염농도의 폐수를 처리하며 COD 500ppm 이상이 되거나 난분해성 물질의 농도가 높으면 잘 처리되지 않기 때문에 다량의 희석수를 사용하여 희석하여 처리해야 한다.In the general wastewater treatment process using activated sludge, aeration is performed by using compressed air, so the concentration of activated sludge in the aeration tank is maintained at about 2-4 g / l. It is returned to the aeration tank. Such wastewater treatment equipment usually treats organic pollutant concentrations of 200-300ppm COD (chemical oxygen demand), and dilutes using a large amount of dilution water because COD 500ppm or higher or hardly decomposable substances are not treated well. Should be dealt with.

활성슬러지의 농도를 높게 유지하면 보통의 처리법 보다 더 많은 양의 오염부하를 처리할 수 있으며 고농도의 폐수도 처리할 수 있어서 폭기조의 면적을 줄이고 콤팩트하게 할 수 있으며 처리에너지를 줄이는 등 여러가지 이점이 있다. 그리고 난분해성 물질의 처리시에도 활성슬러지의 평균 체류시간을 크게 하여 성장속도가 느린 난분해성 물질을 분해할 수 있는 미생물을 안정화시켜 활성슬러지 중에 존재하게 할 수가 있다.Maintaining high concentration of activated sludge can handle more pollutant load than usual treatment, and can treat high concentration of wastewater, which can reduce the area of aeration tank, make it compact, and reduce treatment energy. . In the treatment of hardly decomposable materials, the average residence time of activated sludge is increased to stabilize microorganisms capable of degrading slow-decomposable hardly decomposable substances, thereby allowing them to be present in the activated sludge.

일반적인 미생물부유현탁법 활성슬러지 반응조에서는 압축공기를 사용하여 폭기할 때에 용존산소 농도의 제한에 있어서 고농도로 유지하기 어렵기 때문에 농축산소를 사용한 방법이 개발되었다.In the general microbial suspension suspension activated sludge reactor, a method using concentrated oxygen has been developed because it is difficult to maintain a high concentration in limiting the dissolved oxygen concentration when aerated using compressed air.

그러나 농축산소를 사용하더라도 고·액 분리 시스템으로 침전조를 사용할 때에는 침전조의 성능상 고농도 슬러지를 취급하기에는 한계가 있다. 활성슬러지의 농도가 높아지면 슬러지의 침전속도가 느려지게 되기 때문에 농축산소를 이용하는 활성슬러지 반응시스템에서는 4-8g/ℓ 정도를 유지한다.However, even when concentrated oxygen is used, there is a limitation in handling high concentration sludge due to the performance of the sedimentation tank when the sedimentation tank is used as a solid-liquid separation system. As the concentration of activated sludge increases, the sludge settling rate is slowed down. Therefore, the activated sludge reaction system using concentrated oxygen maintains about 4-8 g / l.

한편 활성슬러지 고·액 분리에 침전조를 대신하여 분리막을 사용하는 활성슬러지 막분리 공정이 제안되어 일부 보급되기 시작하고 있다. Hardt F.W.(1970) 등은 한외여과막을 사용하여 활성슬러지를 처리하는 연구를 하였으며 Yamamoto K.(1989) 등은 중공사 분리막을 활성슬러지 폭기조내에 넣어서 처리수를 뽑아내는 방법을 연구하였다. 원촌승공(元忖勝公)(1991) 등은 분뇨처리장치에서 고농도로 활성슬러지를 반응시킨 다음 관형 한외여과막을 사용하여 처리하는 시도를 하였다.Meanwhile, an activated sludge membrane separation process using a membrane instead of a sedimentation tank for separating activated sludge solids and liquids has been proposed, and some parts are being spread. Hardt F.W. (1970) et al. Studied the treatment of activated sludge using ultrafiltration membranes, and Yamamoto K. (1989) investigated the method of extracting treated water by placing hollow fiber membranes in activated sludge aeration tanks. Wonchon Seunggong (1991) et al. Attempted to treat activated sludge at high concentration in a manure treatment system and then use a tubular ultrafiltration membrane.

생물처리 측면에서 막분리와 결합할 때의 장점을 보면,In terms of bioprocessing, the advantages of combining with membrane separation,

(1) 고형물질은 막분리에 의해 거의 100% 제거되기 때문에 처리수질이 슬러지의 침강에 영향을 받지 않는다.(1) Since the solid material is almost 100% removed by membrane separation, the treated water quality is not affected by sludge settling.

(2) 슬러지 체류시간을 충분히 길게 하는 것이 가능하여 특히 질화균 같은 증식속도가 느린 미생물의 증식, 고농도 유지가 가능하다.(2) It is possible to lengthen the sludge residence time sufficiently, so that it is possible to proliferate and maintain high concentration of microorganisms with slow growth rate, especially nitrification bacteria.

(3) 미생물을 가능하면 분산상태로 유지하여 고농도의 생물반응조로 유지하는 것이 가능하므로 전체적으로 활성도를 높이는 것이 가능하다.(3) It is possible to maintain the microorganisms in a dispersed state if possible, and to maintain the activity in a high concentration of bioreactor.

(4) 고농도이므로 내생탈질이 용이하게 되어 질소제거가 용이하다.(4) Because of high concentration, endogenous denitrification is easy and nitrogen is easy to remove.

(5) 고분자 물질의 유출이 안되므로 처리효율이 높아진다.(5) The treatment efficiency is high because the polymer material is not spilled.

(6) 세균이나 비루스의 제거가 기대된다.(6) The removal of bacteria and viruses is expected.

한편 막분리 측면에서 생물처리와 결합했을 때 발생하는 장점을 보면,On the other hand, in terms of membrane separation, the advantages that occur when combined with biological treatment,

(1) 분리막 단독으로는 제거가 되지 않는 저분자 용존 유기물질을 미생물이 섭취하여 가스나 균체 성분으로 만들고 고분자화하므로 처리수질이 향상된다.(1) The quality of treated water is improved because microorganisms ingest low-molecular dissolved organic substances that cannot be removed by membrane alone and make them into gas or cell components and polymerize them.

(2) 막에서 투과하지 않는 고분자 물질은 생물분해성이 있으며 분해되어 처리시스템내에 무한히 축적이 되지 않는다.(2) Polymers that do not permeate through the membrane are biodegradable and decompose and do not accumulate infinitely in the treatment system.

이상과 같이 활성슬러지와 분리막을 결합하면 자연히 고농도 활성슬러지로 운전이 되고 단일조내에서 질화, 탈질이 용이하게 되어 자연히 고도처리를 달성할 수 있는 이점이 있다.Combining the activated sludge and the separation membrane as described above is naturally operated as a high concentration of activated sludge, nitriding, denitrification is easy in a single tank, there is an advantage that can naturally achieve high processing.

그러나 압축공기로 폭기를 할 때에는 공기중에 산소농도가 20% 밖에 되지 않아서 산소이용 효율도 낮고 폭기조내에 충분한 용존산소를 공급해 주기 어려우며 다량의 배출가스가 발생하는 단점이 있다.However, when aeration with compressed air, the oxygen concentration in the air is only 20%, so the oxygen utilization efficiency is low, it is difficult to supply sufficient dissolved oxygen in the aeration tank and a large amount of exhaust gas is generated.

본 발명에서는 고·액 분리에는 한외여과막을 사용하여 활성슬러지를 고농도로 유지시키며 처리수의 수질을 높이고, 높아진 고농도의 활성슬러지에 필요한 산소는 PSA 산소제조장치를 사용하여 농축산소를 공급하므로서 폭기조내에 충분한 용존 산소의 농도를 유지시키며 고농도의 활성슬러지 반응조건을 만들어 폐수처리장치의 처리 효율을 높이는데 그 목적이 있다.In the present invention, the ultrafiltration membrane is used to maintain the activated sludge at a high concentration, and the water quality of the treated water is increased. The purpose is to maintain a sufficient dissolved oxygen concentration and to increase the treatment efficiency of the wastewater treatment system by creating a high concentration of activated sludge reaction conditions.

상기 목적을 달성하기 위하여 본 발명은 제올라이트 X를 충진한 2배드(Bed) 산소 PSA를 사용하여 산소 농도 90-93%, 압력 0.7-1Kg/㎠로 농축산소를 제조하여 밀폐식 다단 활성슬러지 반응기에 공급하여 활성슬러지용 8-15g/ℓ의 고농도로 유지시키는 데에 충분한 용존산소를 공급하며 반응된 고농도 활성슬러지는 관형 한외여과막을 사용하여 순환 선속도를 1-3m/s로 유지하며 고·액 분리하므로서 고농도의 유기계수, 난분해성 폐수를 효율적으로 처리하는 것을 특징으로 한다.In order to achieve the above object, the present invention uses a two-bed oxygen PSA filled with zeolite X to produce concentrated oxygen at an oxygen concentration of 90-93% and a pressure of 0.7-1 Kg / cm 2 to a closed multistage activated sludge reactor. It supplies enough dissolved oxygen to maintain a high concentration of 8-15g / ℓ for activated sludge, and the reacted high concentration activated sludge maintains a linear linear velocity of 1-3m / s using a tubular ultrafiltration membrane. Separation is characterized by the efficient treatment of high concentration of organic coefficient, hardly degradable wastewater.

이하 본 발명을 첨부 제1도 내지 제3도에 연계하여 설명하면 다음과 같다.Hereinafter, the present invention will be described with reference to the attached FIGS. 1 to 3 as follows.

공기압축기에서 약 1Kg/㎠ 으로 압축된 압축공기는 제올라이트 X가 충진되어 있는 흡착탑(AD1)으로 공급되어 질소가 흡착되고 농축된 산소가 밸브 5를 통하여 산소저장조로 들어간다. 흡착스텝이 끝나면 진공펌프로 탈착하여 흡착탑 AD1은 재생단계에 들어간다.Compressed air compressed at about 1 Kg / cm 2 from the air compressor is supplied to the adsorption tower (AD1) filled with zeolite X, where nitrogen is adsorbed and concentrated oxygen enters the oxygen storage tank through valve 5. After the adsorption step, the vacuum pump is desorbed and the adsorption tower AD1 enters the regeneration phase.

이와 같이 흡착탑 AD1과 AD2는 교대로 작동되어 계속하여 농축산소를 제공한다. 산소저장조에는 농축산소가 저장되어 재생이 끝난 흡착탑의 세정 및 축압에 필요한 산소를 공급하고 활성슬러지 반응 시스템에 필요한 제품산소를 연속적으로 제공한다. 따라서 산소저장조의 압력 0.7-1.0Kg/㎠ 정도로 유지하여 별도의 산소압축기가 없이 활성슬러지 폭기조에 농축산소를 공급하도록 한다.As such, the adsorption towers AD1 and AD2 alternately operate to provide concentrated oxygen. The oxygen storage tank stores concentrated oxygen to supply oxygen for cleaning and accumulating the regenerated adsorption tower and continuously provides the product oxygen for the activated sludge reaction system. Therefore, the pressure of the oxygen storage tank is maintained at 0.7-1.0Kg / ㎠ to supply concentrated oxygen to the activated sludge aeration tank without a separate oxygen compressor.

산소저장조의 농축산소는 압력조절밸브를 통하여 첫번째 폭기조내 압력이 50-80mmH2O로 유지되도록 조절하여 주며 폭기조내로 공급된다. 활성슬러지 폭기조는 3 내지 4개로 직렬로 연결되어 액체는 자연 낙하식으로 흐르게 하고 기체 부분은 연결관을 통하여 차례로 연결되어 마지막 폭기조의 상부에서 산소농도 조절밸브를 통하여 산소농도가 50-60% 정도로 배출되도록 한다. R1, R2, R3, R4의 폭기조에는 각 부분별로 송풍기를 설치하여 기체부분의 가스가 송풍기를 통하여 폭기조 하부의 산기관으로 순환되어 폭기조내의 혼합을 이루며 산소의 용해를 이룬다. 일차 침전조를 통과한 원폐수는 폭기조 R1에 공급되고 R1, R2, R3, R4를 거쳐 차례로 처리되어 슬러지 저장조로 들어가서 한외 여과막 순환펌프 P2에 의하여 펌핑되어 한외 여과막을 통과하여 투과된 투과수는 배출되거나 재사용처로 보내진다. 슬러지 저장소의 수위를 조절하기 위하여 수위측정기 LT에 의하여 수위가 일정한 높이가 되면 펌프 P2를 가동시켜 한외 여과막내에서 선속도가 1-3m/s 정도 되도록 유지시키며 수위가 일정속도 이하가 되면 순환펌프가 정지되도록 한다. 슬러지 저장조의 슬러지 중 일정량은 순환펌프 P3를 통하여 폭기조 R1으로 재순환된다.The concentrated oxygen of the oxygen storage tank is controlled through the pressure regulating valve so that the pressure in the first aeration tank is maintained at 50-80 mmH 2 O and supplied into the aeration tank. Activated sludge aeration tanks are connected in series of 3 to 4 so that the liquid flows naturally, and the gas parts are connected in order through the connecting pipe, and the oxygen concentration is discharged to 50-60% through the oxygen concentration control valve at the top of the last aeration tank. Be sure to In each aeration tank of R 1 , R 2 , R 3 , and R 4 , a blower is installed for each part so that the gas in the gas part is circulated through the blower to the diffuser in the lower portion of the aeration tank to form a mixture in the aeration tank and to dissolve oxygen. The raw wastewater passing through the primary settling tank is supplied to the aeration tank R 1 , and is sequentially processed through R 1 , R 2 , R 3 , and R 4 , entering the sludge storage tank, pumped by the ultrafiltration membrane circulation pump P2, and permeated through the ultrafiltration membrane. Permeate is discharged or sent to reuse. In order to control the level of the sludge reservoir, the pump P2 is operated when the water level reaches a certain level by the water level meter LT, and the linear velocity is maintained at 1-3m / s in the ultrafiltration membrane. Let it stop A certain amount of sludge in the sludge storage tank is recycled to the aeration tank R1 through the circulation pump P3.

이러한 운전으로 폭기조내의 활성슬러지 농도는 8-15g/ℓ 정도로 고농도로 유지되도록 하면서 슬러지 농도가 과다하게 되면 일정량의 슬러지는 펌프 P4를 통하여 배출하여 폐슬러지로 한다.In this operation, the activated sludge concentration in the aeration tank is maintained at a high concentration of about 8-15 g / l, and when the sludge concentration is excessive, a certain amount of sludge is discharged through the pump P4 to make waste sludge.

[실시예]EXAMPLE

제3도는 직경 5㎝, 높이 160㎝의 흡착탑에 제올라이트 X약 2.2Kg, 활성알루미나 650g을 충진한 산소 PSA를 이용하여 산소를 93% 농축시켜 활성슬러지 반응기에 공급하여 반응기내에 활성슬러지 농도를 8-14g/ℓ 정도로 유지하며 합성폐수 농도 COD 6000, COD 9000ppm으로 공급하며 운전한 결과를 나타내었다. 거의 모든 경우에 한외여과막을 통과한 투과수의 COD는 20ppm 이하로 COD 처리효율은 99% 이상이었으며 투과수에는 고형물질이 거의 없는 투명한 투과수를 얻을 수 있었다.3 is concentrated by 93% oxygen using oxygen PSA packed with zeolite X about 2.2Kg and activated alumina 650g in an adsorption tower 5cm in diameter and 160cm in height and supplied to the activated sludge reactor. Maintained at 14g / ℓ and supplied with synthetic wastewater concentration COD 6000, COD 9000ppm showed the results. In almost all cases, the COD of the permeated water that passed through the ultrafiltration membrane was less than 20ppm, the COD treatment efficiency was more than 99%, and the transparent permeate with almost no solid matter was obtained.

한편, 합성폐수에 (NH4)HCO3, (NH4)2SO4등의 형태로 질소성분이 공급되었으나 NH/3-N은 거의 100% 정도 제거되고 질산성 질소형태로 약 7% 정도가 남아서 총 탈질효율이 93% 이상으로 처리되었다. 한외여과막은 폴리이미드(Polymide)로 된 관형막을 사용하였으며 투과유속이 5ℓ/(㎡,hr,Kg/㎠) 이하로 되면 약품세정을 하여 다시 사용하여 투과유속은 5-15ℓ/(㎡,hr,Kg/㎠)을 유지하였다.Meanwhile, nitrogen was supplied to synthetic wastewater in the form of (NH 4 ) HCO 3 , (NH 4 ) 2 SO 4, etc., but NH / 3-N was almost 100% removed and about 7% in the form of nitrate nitrogen. The total denitrification efficiency remained above 93%. The ultrafiltration membrane used a tubular membrane made of polyimide, and when the permeation flow rate was 5ℓ / (㎡, hr, Kg / ㎠) or less, the product was washed with chemicals and used again.The permeation flux was 5-15ℓ / (㎡, hr, Kg / cm 2) was maintained.

한외여과막은 투과유속이 일정유속으로 줄어들면 NaOCl과 NaOH 그리고 HCl등으로 세정을 한 다음 다시 사용한다.The ultrafiltration membrane is washed with NaOCl, NaOH and HCl when the permeate flow rate is reduced to a constant flow rate and then used again.

이와 같이 구성되어진 본 발명은 고농도 유기폐수나 난분해성 산업폐수 등을 효율적으로 처리할 수 있으며 처리수를 재활용할 수 있어 현재 심각하게 대두되는 산업폐수로 인한 환경문제 해결에 그 효과가 기대되는 것이다.The present invention configured as described above can efficiently treat high concentration organic wastewater or hardly decomposable industrial wastewater, and can recycle treated water, which is expected to have an effect on solving environmental problems caused by industrial wastewater, which is currently emerging seriously.

Claims (1)

제올라이트 X를 충진한 2배드(Bed) 산소 PSA를 사용하여 산소 농도 90-93%, 압력 0.7-1Kg/㎠로 농축산소를 제조하여 밀폐식 다단 활성슬러지 반응기에 공급하여 활성슬러지용 8-15g/ℓ의 고농도로 유지시키는 데에 충분한 용존산소를 공급하여 반응된 고농도 활성슬러지는 관형 한외여과막을 사용하여 순환 선속도를 1-3m/s로 유지하여 고·액 분리하므로서 고농도의 유기폐수, 난분해성 폐수를 처리하는 것을 특징으로 하는 농축산소와 한외여과막을 사용한 고농도 활성슬러지 폐수처리방법.Using 2 bed oxygen PSA filled with zeolite X, concentrated oxygen was produced at an oxygen concentration of 90-93% and a pressure of 0.7-1 Kg / cm 2 and supplied to a closed multistage activated sludge reactor to supply 8-15 g / s of activated sludge. High concentration of activated sludge reacted by supplying sufficient dissolved oxygen to maintain high concentration of ℓ by using tubular ultrafiltration membrane to maintain circulation linear velocity of 1-3m / s to separate solid and liquid High concentration activated sludge wastewater treatment method using concentrated oxygen and ultrafiltration membrane, characterized in that the wastewater is treated.
KR1019940026916A 1994-10-21 1994-10-21 Activated sludge process using ultrafiltration and concentrated oxygen KR0124039B1 (en)

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