KR20040042081A - Sewage and wastewater treatment process and facilities - Google Patents

Sewage and wastewater treatment process and facilities Download PDF

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Publication number
KR20040042081A
KR20040042081A KR1020020070221A KR20020070221A KR20040042081A KR 20040042081 A KR20040042081 A KR 20040042081A KR 1020020070221 A KR1020020070221 A KR 1020020070221A KR 20020070221 A KR20020070221 A KR 20020070221A KR 20040042081 A KR20040042081 A KR 20040042081A
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KR
South Korea
Prior art keywords
bubble
sewage
mixer
wastewater
bioreactor
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KR1020020070221A
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Korean (ko)
Inventor
이재헌
Original Assignee
주식회사한국연수
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 주식회사한국연수 filed Critical 주식회사한국연수
Priority to KR1020020070221A priority Critical patent/KR20040042081A/en
Priority to PCT/KR2003/002424 priority patent/WO2004043866A1/en
Priority to AU2003277728A priority patent/AU2003277728A1/en
Publication of KR20040042081A publication Critical patent/KR20040042081A/en

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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
    • C02F3/1205—Particular type of activated sludge processes
    • C02F3/1221—Particular type of activated sludge processes comprising treatment of the recirculated sludge
    • 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
    • C02F3/1236—Particular type of activated sludge installations
    • C02F3/1242—Small compact installations for use in homes, apartment blocks, hotels or the like
    • C02F3/1247—Small compact installations for use in homes, apartment blocks, hotels or the like comprising circular tanks with elements, e.g. decanters, aeration basins, in the form of segments, crowns or sectors
    • 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
    • C02F3/22—Activated sludge processes using circulation pipes

Abstract

PURPOSE: Provided are a method and an apparatus for collecting and recycling bubbles in a sewage/wastewater treatment plant to increase oxygen transfer rate and oxygen utilization mission rate, thereby increasing removal efficiency of organic material and nutritive salts. CONSTITUTION: The apparatus comprises a bioreactor(80), a bubble collection plate(60) installed in the bioreactor(80) at an upper part thereof for collecting bubbles, a submerged mixer(30) installed under the bubble collection plate(60), a guide pipe(40) for guiding wastewater passing through the mixer(30), a hunch(70) installed under the plate(60) for blocking the bubbles rising in wastewater in the bioreactor(80), an inlet pipe(10) for transferring wastewater to an upper end of the guide pipe(40), an air supply unit(20) installed on the outside of the bioreactor main body(80) for generating air or oxygen and supplying it to the bioreactor(80), and an auxiliary mixer(31) fixed on the wall of the bioreactor(80) in the middle portion thereof.

Description

하·폐수 처리 설비에서의 생물학적 반응조를 위한 기포 포집 재순환 장치 {SEWAGE AND WASTEWATER TREATMENT PROCESS AND FACILITIES}Bubble collection and recirculation unit for biological reaction tank in sewage and wastewater treatment facility {SEWAGE AND WASTEWATER TREATMENT PROCESS AND FACILITIES}

기존의 하수나 유기성 폐수의 생물학적 처리방법(활성슬러지공법)은 포기Existing biological treatment method (activated sludge method) of existing sewage or organic wastewater is abandoned

조의 수심이 통상 4∼5m로 소요부지가 넓고 투입되는 공기의 용해율이The water depth of the tank is usually 4-5m, and the required site is large, and the dissolution rate of the introduced air is

5∼10% 정도로 낮아 시설비와 운영비 등 경제적인 측면과 처리효율 및 포기5 ~ 10%, economical aspects such as facility cost and operation cost, disposal efficiency and abandonment

조의 용적등 기술적인 측면에서도 매우 비효율적으로 운영되고 있다.It is operating very inefficiently in terms of technical aspects such as Joe's volume.

현재의 활성슬러지공법은 그 효율을 높이기 위하여 포기조에 접촉제등을Current activated sludge process uses contact agent to give up tank to increase efficiency.

설치하는 등의 시도를 하고 있으며 어느정도 효율의 상승을 기대할수 있으나We are trying to install it and expect some increase in efficiency.

아직 미흡하고 시간의 경과에 따른 미생물의 탈리 현상등으로 안정적인 처리Stable treatment due to lack of microorganisms and desorption of microorganisms over time

에 문제가 있으며, 산소전달율 및 이용율등에 많은 개선 여지가 있다.There is a problem, and there is much room for improvement in oxygen transfer rate and utilization rate.

심층 순산소 포기방식도 이러한 점을 개선하고 효율을 높이기 위하여 포기In-depth oxygen abandonment also gives up to improve this and increase efficiency.

조에 순산소를 이용하고 포기조 높이를 높여 처리하고 있으나 처리효율을 더The tank uses pure oxygen and raises the aeration tank height, but the treatment efficiency is higher.

욱 개선하는 것이 요구되고 있다.Improvements are required.

본 발명은 하·폐수 처리장치에 있어서 반응조의 수심을 필요에 따라 조절The present invention adjusts the depth of the reaction tank as needed in the sewage and wastewater treatment apparatus.

할 수 있으며, 반응조 내에 기포포집판(60) 및 수중믹서기를 설치하여 산소And oxygen by installing the bubble collector 60 and the water mixer in the reactor.

기체의 농도를 높게 유지할 수 있으며 물에 용해되지 않고 상승하는 기포를It is possible to keep the concentration of gas high, and it does not dissolve in water.

포집하여 재순환 이용함으로써 산소전달율, 이용율을 극대화시키며 MLSS 농By collecting and recycling, it maximizes oxygen transfer rate and utilization rate.

도를 높게 유지할수 있어 하·폐수내의 유기물과 영양염류등의 처리효율을It is possible to maintain the high degree, and to improve the treatment efficiency of organic matter and nutrients in sewage and wastewater.

획기적으로 개선하여 반응조의 용적을 최소화하고 소요부지를 현격히 줄일수Significantly improved by minimizing the volume of the reactor and significantly reducing the site required

있다. 따라서 설치비용과 운영비등을 상당히 줄일수 있는 우수한 기술이며,have. Therefore, it is an excellent technology that can significantly reduce installation cost and operation cost.

하·폐수를 재래 시설보다 더 효율적으로 처리할 수 있도록 발명된 것이다.It is invented to treat sewage and wastewater more efficiently than conventional facilities.

본 출원의 목적은 하·폐수처리장치의 생물학 반응조(포기조)에 있어서The purpose of the present application is to provide a biological reaction tank (aeration tank) for sewage and wastewater treatment equipment.

기포포집판과 수중믹서기를 이용하여 반응조 내에서 용존산소의 포화농도를Saturated concentration of dissolved oxygen in the reaction tank was collected using a bubble collector and an underwater mixer.

높게 유지하므로써 종래의 방식보다 산소 전달율 및 이용율을 극대화시켜 처By keeping it high, it maximizes the oxygen transfer rate and utilization rate than the conventional method.

리능력을 개선한 기술을 제공하는 것이다.It is to provide technology with improved capability.

종래의 하·폐수 처리장치는 유기물 제거와 영양염류등 제거에 있어서 그Conventional sewage and wastewater treatment devices are used for removing organic matter and nutrients.

효율이 아주 낮아 비경제적인 문제점이 있었다.The efficiency was very low and there was an uneconomic problem.

본 발명의 목적은 기포포집판을 설치하여 포화농도를 높게 유지하고 물에An object of the present invention is to install a bubble collecting plate to maintain a high saturation concentration in water

용해되지 않고 상승하는 기포를 포집하여 재순환 이용하므로써 산소의 전달Oxygen transfer by collecting and reusing bubbles that rise without melting

율 및 이용율을 극대화시켜서 각종 하·폐수의 유기물 및 영양염류의Maximization of utilization rate and utilization rate of organic materials and nutrients

제거 효율이 아주 높은 생물학반응조(포기조)를 제공하는 데 있다.It is to provide a biological reaction tank (aeration tank) having a very high removal efficiency.

다시말하면, 반응조의 용적당 처리효율을 높임으로서 그에 따른 설치비용,In other words, by increasing the treatment efficiency per volume of the reaction vessel according to the installation cost,

운영비, 소요부지를 현격히 줄일 수 있는 매우 유용한 하·폐수 처리장치를It is a very useful sewage and wastewater treatment system that can drastically reduce operating costs and required sites.

제공하는데 있다.To provide.

도 1 은 본 발명인 기포 포집 재순환 장치의 기포포집판 및 수중믹서기를1 is a bubble collecting plate and an underwater mixer of the present invention bubble collection recirculation apparatus

이용한 설치 개략 구성도.Installation schematic diagram that we used.

<도면중 주요 부분에 대한 부호의 설명><Explanation of symbols for main parts of the drawings>

10 : 하·폐수 유입관 20 : 기체공급장치10: sewage and wastewater inlet pipe 20: gas supply device

30 : 수중믹서기 31 : 보조믹서기30: underwater mixer 31: auxiliary mixer

40 : 유도관 50 : 기체공급관40: induction pipe 50: gas supply pipe

60 : 기포포집판 70 : 헌 치60: bubble collection 70: haunting

80 : 반응조구조체80: reactor structure

이하 첨부된 도면에 의해 상세히 설명하면 다음과 같다.Hereinafter, described in detail by the accompanying drawings as follows.

본 발명은 하·폐수처리장치에 있어서 유입된 하·폐수를 미생물과 산소에The present invention is the wastewater and wastewater introduced in the sewage and wastewater treatment apparatus to the microorganism and oxygen

의해 분해하는 생물학반응조등에 사용할 수 있는 기포포집 재순환장치에 관Pipe collection and recirculation equipment that can be used for biological reaction tanks

한 것으로 반응조 구조체(80)와;The reactor structure 80;

이 구조체(80) 내부 중간 상부에 설치되어 물에 용해되지 않고 상승하는It is installed in the upper middle part of the structure 80 and rises without being dissolved in water.

기포를 포집하여 주는 기포포집판(60)과;A bubble collecting plate 60 for collecting bubbles;

이 기포포집판(60)의 어떤 지점에 수직 또는 하방으로 설치되는 수중믹서Underwater mixer installed vertically or downwards at any point of the bubble collecting plate 60

기(30)와;Group 30;

이 수중믹서기(30)를 통과하는 유체를 일정한 방향으로 유도하는 유도관Induction pipe for guiding fluid passing through the submersible mixer 30 in a constant direction

(40)과;40;

구조체(80) 내부 벽체의 기포포집판(60) 하방에 설치되어 용해되지 않고It is installed below the bubble collecting plate 60 of the inner wall of the structure 80 and does not dissolve.

상승하는 기포를 차단하여 주는 헌치(70)와;Haunchi 70 for blocking the rising bubbles;

하·폐수등을 유도관(40) 상부로 이송하는 유입관(10)과;An inflow pipe 10 for transporting waste water to the upper portion of the induction pipe 40;

반응조 외부에 설치되어 유기물을 처리하는데 필요한 공기 또는 산소를 생Installed outside the reactor to produce air or oxygen needed to treat organic matter

산해 주는 기체공급장치(20)와;A gas supply device 20 for dispersing;

기체를 반응조내로 공급해주는 기체 공급관(50)과;A gas supply pipe 50 for supplying gas into the reaction tank;

필요에 따라 반응조 내 중간벽체부분에 하향식으로 설치되어 수중믹서기If necessary, it is installed on the middle wall of the reactor from the top down

(30)의 기능을 돕는 보조믹서기(31)로 구성된다.It consists of an auxiliary mixer 31 to help the function of (30).

상기 관련 반응조 내부설비는 용량에 따라 복수로 설치할 수 있다.The related reactor internal equipment can be installed in plurality according to capacity.

따라서, 반응조 내 하·폐수 및 용해되지 않고 상승하는 기포를 포집하여Therefore, it collects sewage and wastewater in the reactor and bubbles which rise without melting.

유도관(40) 내로 재유입, 반복 순환시켜 반응조 내에서 산소의 용해율 및Re-introduced into the induction pipe 40 and repeated circulation to dissolve the oxygen in the reaction tank and

혼합효율을 높임으로써 처리효율을 극대화 시켜 준다.By increasing the mixing efficiency, the processing efficiency is maximized.

사용되는 기체가 산소일 경우 기포포집판(60) 하부에서의 포화 용존농도를When the gas used is oxygen, the saturated dissolved concentration at the bottom of the bubble collecting plate 60

상당히 높임으로써 효율을 더욱 더 증가시켜 준다.Significantly higher, the efficiency is further increased.

반응조 수심은 필요에 따라 조절할수 있으며, 반응조 내 산소의 포화농도The reactor depth can be adjusted as needed, and the saturation concentration of oxygen in the reactor

를 높게 유지하고 산소의 전달율, 이용율을 극대화 할수 있어 하·폐수내의To keep high and to maximize the rate of oxygen transfer and utilization.

유기물과 영양염류등의 처리효율을 높임으로써 설치비용, 운영비, 소요부지Installation cost, operation cost, and site required by increasing the processing efficiency of organic matter and nutrients

를 현격히 줄일 수 있는 매우 유용한 발명인 것이다.It is a very useful invention that can significantly reduce.

이하, 본 발명의 바람직한 실시예를 첨부된 도면에 의해 상세히 설명하면Hereinafter, described in detail by the accompanying drawings a preferred embodiment of the present invention

다음과 같다.As follows.

도면1은 기포포집판(60) 및 수중믹서기(30)를 이용하여 처리효율을 높인1 shows the use of the bubble collecting plate 60 and the underwater mixer 30 to increase the processing efficiency.

하·폐수처리장치를 개략도로 표시한 공정도이다.It is a process chart which shows schematic diagram of sewage and wastewater treatment apparatus.

상기 구조체(80)는 수심을 필요에 따라 조절할수 있으며, 유입된 하·폐수The structure 80 can adjust the depth as needed, the introduced sewage, wastewater

를 미생물과 산소에 의해 정화 처리할 수 있도록 하는 것이다.Is to be purified by microorganisms and oxygen.

상기 반응조 내에 처리되기 전의 하·폐수는 유입관(10)을 통하여 유도관Wastewater before the treatment in the reactor is introduced through the inlet pipe (10)

(40) 상부에 도달하게 되며 이 과정에서 기체공급장치(20)에서 생산된 기체40 reaches the top and the gas produced in the gas supply device 20 in the process

가 기체공급관(50)을 통하여 혼합된다.Is mixed through the gas supply pipe (50).

산기관 방식은 반응조 구조체(80) 하부에 산기관을 고르게 분포시켜 설치The diffuser system is installed by evenly distributing the diffuser under the reactor structure 80.

하여 기체공급장치(20)에서 생산된 기체를 기체공급관(50)을 통하여 혼합된The gas produced in the gas supply device 20 is mixed through the gas supply pipe 50

다.All.

유도관(40) 상단부에 설치되는 수중믹서기(30)는 유도관(40) 안으로 투입The water mixer 30 installed at the upper end of the induction pipe 40 is introduced into the induction pipe 40.

된 하·폐수와 산소를 고속으로 혼합하여 반응조의 일정한 방향으로 이송 시Mixed sewage and wastewater with oxygen at high speed

켜주며 또한 기포포집판(60) 중앙 상부에 용해되지 않고 상승하는 기포를It also turns on bubbles that rise without dissolving in the center of the bubble collecting plate 60

유도관(40) 상부로 재 투입하여 기포를 미세하게 잘라주기 때문에 산소전달Oxygen transfer because of re-injection into the upper part of the induction pipe 40 to finely cut bubbles

율, 이용율을 극대화시켜 유도관(40) 아래로 이동시켜 줄수 있게 된다.Maximize the rate, utilization rate will be able to move under the guide tube (40).

반응조의 깊이가 클 경우 반응조 내 중간벽체부분등에 필요에 따라 하향식If the depth of the reactor is large, top-down as necessary for the intermediate wall portion of the reactor, etc.

으로 설치되는 보조믹서기(31)는 유도관(40) 아래로 이송된 기체와 하·폐수Auxiliary mixer 31 installed as the gas and the sewage and waste water transferred down the induction pipe 40

의 혼합액을 고속으로 회전시켜 접촉효율을 높여줌과 동시에 반응조 하단에Of the mixed solution at high speed to increase the contact efficiency and at the same time

침전물이 발생하는 것을 방지해 준다.Prevents sediment from occurring

반응조구조체(80)의 내벽을 따라 포기조 상부로 올라가는 기포들은 헌치Bubbles that rise to the top of the aeration tank along the inner wall of the reactor structure 80 are haunches

(70)에 걸려 기포포집판(60)의 상부로 포집되어 대부분 유도관(40) 내로 재It is caught by the 70 is collected to the upper portion of the bubble collecting plate 60 to re-manufacture the most into the induction pipe 40

유입되어 수중믹서기(30)에 의해 상기 과정을 반복하게 된다.It is introduced to repeat the process by the underwater mixer (30).

이러한 구성의 반응조에서는 하·폐수, 기체, 미생물이 충분히 혼합되는In such a reactor, sewage, wastewater, gas, and microorganisms are sufficiently mixed.

상태로 순환되며 이 과정에서 산소전달율과 이용율이 극대화 되어 하·폐수In this process, oxygen transfer rate and utilization rate are maximized.

내의 유기물과 영양염류가 높은 효율로 분해되는 것이다.Organics and nutrients in the body are broken down with high efficiency.

따라서 본 발명인 하·폐수처리장치는 용해되지 않고 기포로 상승하는 기Therefore, the present invention, the sewage and wastewater treatment device is a gas that rises to the bubble without melting

체의 대부분을 포집하여 재이용함으로써 산소이용율을 극대화시켜 각종By collecting and reusing most of the sieve, it maximizes oxygen utilization rate

하·폐수의 유기물과 영양염류를 재래시설보다 더 효율적으로 처리할 수 있Organic and nutrients from sewage and wastewater can be treated more efficiently than conventional facilities.

는 것이다.Will.

상기와 같은 본 발명의 구성에 의하면, 기체포집판(60), 수중믹서기(30),According to the configuration of the present invention as described above, the gas collecting plate 60, the underwater mixer 30,

유도관(40) 및 헌치(70)등을 설치하여 산소 전달율 및 이용율을 높임으로서Induction pipes (40) and haunchi (70), such as to increase the rate of oxygen transfer and utilization

보다 효율적인 유기물 및 영양염류의 제거를 도모할 수 있으며, 따라서 반응More efficient removal of organics and nutrients, and therefore reaction

조 용적을 최소화함으로서 설치비용, 운영비, 소요부지등을 현격히 줄일 수By minimizing the volume of operation, installation costs, operating costs, and required sites can be significantly reduced.

있다.have.

그러므로, 하·폐수 내의 유기물 및 영얌염류를 보다 효율적으로 처리할Therefore, organic matters and young salts in sewage and waste water can be treated more efficiently.

수 있으므로, 처리효율에 대한 신뢰성 및 운용 편의성을 향상시킬 수 있는Can improve the reliability and operational convenience of processing efficiency

매우 유용한 발명인 것이다.It is a very useful invention.

Claims (3)

하·폐수처리장치에 있어서 유입된 하·폐수를 미생물과 산소에 의해 분해The sewage and wastewater in the sewage and wastewater treatment system is decomposed by microorganisms and oxygen 하는 생물학 반응조 (포기조)등에 사용할 수 있는 기포 포집 재순환 장치에To bubble collection recirculation apparatus which we can use for biological reaction tank (aeration tank) to say 관한 것으로About 반응조 내부 중간에 설치되어 물에 용해되지 않고 상승하는 기포를 포집하It is installed in the middle of the reactor to collect rising bubbles without dissolving in water. 여 주는 기포포집판(60)과;Air bubble collecting plate 60; 기포포집판(60)의 어떤 지점에 수직 또는 하방으로 설치되는 수중믹서기Underwater mixer installed vertically or downwards at any point of the bubble collecting plate 60 (30)와;30; 이 수중믹서기(30)를 통과하는 유체를 일정한 방향으로 유도하는 유도관Induction pipe for guiding fluid passing through the submersible mixer 30 in a constant direction (40)과;40; 구조체(80) 내부 벽체의 기포포집판(60) 하방에 설치되어 용해되지 않고It is installed below the bubble collecting plate 60 of the inner wall of the structure 80 and does not dissolve. 상승하는 기포를 모두 기포포집판(60) 안으로 유도해 주는 헌치(70)로 구성Consists of haunchi (70) to guide all the rising bubbles into the bubble collecting plate (60) 되는 기포 포집 재순환 방법 및 그 장치.Bubble collection recycling method and apparatus thereof. 상기 청구항 1의 기포 포집 재순환 장치에 있어서 보조믹서기(31)를 장착하In the bubble collection and recirculation apparatus of claim 1, the auxiliary mixer 31 is mounted. 여 처리효율을 높인 기포포집 재순환 방법 및 그 장치.Bubble collection recycling method and apparatus therefor with improved processing efficiency. 상기 청구항 1,2 에 있어서 반응조 내부에 기포포집판(60)과 수중믹서기(30)Bubble trap plate 60 and the water mixer 30 in the reaction tank of claim 1 , 보조믹서기(31), 헌치(70)등을 복수로 설치하는 것을 특징으로 하는 기포Bubbles, characterized in that a plurality of auxiliary mixers 31, haunchi 70, etc. are installed 포집 재순환 방법 및 그 장치Collection recycling method and apparatus
KR1020020070221A 2002-11-13 2002-11-13 Sewage and wastewater treatment process and facilities KR20040042081A (en)

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KR1020020070221A KR20040042081A (en) 2002-11-13 2002-11-13 Sewage and wastewater treatment process and facilities
PCT/KR2003/002424 WO2004043866A1 (en) 2002-11-13 2003-11-12 Apparatus for the biological treatment of wastewater
AU2003277728A AU2003277728A1 (en) 2002-11-13 2003-11-12 Apparatus for the biological treatment of wastewater

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20040051785A (en) * 2002-12-13 2004-06-19 이재헌 Bubble Arresting and Recycling Method and Facilities for Biological Reactors of Wastewater Treatment Plants
KR20210013502A (en) * 2019-07-26 2021-02-04 주식회사 에싸 A2O and SBR hybrid type Wastewater treatment system

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JPS63209791A (en) * 1987-02-26 1988-08-31 Sumitomo Jukikai Envirotec Kk Aerator
JPH0487693A (en) * 1990-07-27 1992-03-19 Hitachi Kiden Kogyo Ltd Waste water treating device
JPH05228490A (en) * 1992-02-21 1993-09-07 Hitachi Kiden Kogyo Ltd Method for aeration and apparatus therefor
JPH0623391A (en) * 1992-03-26 1994-02-01 Ebara Infilco Co Ltd Ascending flow type biological treatment apparatus
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KR960006990A (en) * 1994-08-08 1996-03-22 조안 엠. 젤사 Gas-Liquid Mixing System Due to Gas Control
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63209791A (en) * 1987-02-26 1988-08-31 Sumitomo Jukikai Envirotec Kk Aerator
JPH0487693A (en) * 1990-07-27 1992-03-19 Hitachi Kiden Kogyo Ltd Waste water treating device
JPH05228490A (en) * 1992-02-21 1993-09-07 Hitachi Kiden Kogyo Ltd Method for aeration and apparatus therefor
JPH0623391A (en) * 1992-03-26 1994-02-01 Ebara Infilco Co Ltd Ascending flow type biological treatment apparatus
JPH0681699U (en) * 1993-05-10 1994-11-22 株式会社クボタ Oxygen supply device for deep aeration tank
KR960006990A (en) * 1994-08-08 1996-03-22 조안 엠. 젤사 Gas-Liquid Mixing System Due to Gas Control
JPH09117785A (en) * 1995-10-24 1997-05-06 Hitachi Plant Eng & Constr Co Ltd Waste water treating device
KR20040013521A (en) * 2002-08-07 2004-02-14 주식회사한국연수 Sewage and wastewater treatment process and facilities

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20040051785A (en) * 2002-12-13 2004-06-19 이재헌 Bubble Arresting and Recycling Method and Facilities for Biological Reactors of Wastewater Treatment Plants
KR20210013502A (en) * 2019-07-26 2021-02-04 주식회사 에싸 A2O and SBR hybrid type Wastewater treatment system

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