MBR 단일 반응조에서 용존산소 농도에 따른 동시 질산화-탈질반응(SND)의 영향

박노백 ( Noh Back Park ),최우영 ( Woo Yung Choi ),윤애화 ( Ae Hwa Yoon ),전항배 ( Hang Bae Jun ) 韓國環境農學會 2009 한국환경농학회지 Vol.28 No.4

MBR(Membrane Bio-reactor) 반응조 내 동시 질산화·탈질(Simultaneous Nitrification and Denitrification, SND)반응을 적용하여 폐수의 유기물 및 질소(N) 제거를 위해 적절한 용존산소(DO) 농도를 도출 및 질산화 및 탈질반응에 미치는 영향을 관찰하기 위해 실험을 수행하였다. 연속 운전실험 결과 반응조 내 pH는 7.5-8.0을 유지하면서 특별한 외부 탄소원의 주입 없이 질소제거가 가능하였다. 용존산소 농도에 따른 유출수의 CODcr 평균 농도는 각각 2.39, 2.95, 12.18 mg/L로 나타났으며, 제거율은 각각 99.3, 99.0, 96.0%로 안정적인 처리 효율을 나타내었다. 운전 조건별(Run 1, 2, 3) 용존산소(DO) 농도에 따른 유출수의 총질소(TN) 농도는 8.62, 7.75, 11.82 mg/L로, 제거효율은 69.88, 72.92, 58.70% 이었고, 용존산소의 농도가 1.3-1.6 mg/L 범위일 때, SND 반응을 적용한 질소제거가 가능한 것으로 나타났다. 회분식 실험 결과 암모니아성 질소(NH4+-N)의 질산화 반응속도의 경우 용존산소 농도에 증가하였으며, 탈질 반응의 경우 반응조 내 적정 C/N비를 유지하였을 때 용존산소 1.0-1.3 mg/L 범위에서 탈질 반응이 일어나는 것을 확인하였다. In this study, simultaneous nitrification and denitrification (SND) from synthetic wastewater were performed to evaluate dissolved oxygen(DO) effects on chemical oxygen demand(COD) and nitrogen removal in a single membarne bio-reactor(MBR). DO levels in MBR at Run 1, 2, and 3 were 1.9~2.2, 1.3~1.6, and 0.7~1.0 mg/L, respectively. Experimental results indicated that DO had an important factor to affect COD and total nitrogen(TN) removal. SND were able to be accomplished in the continuous-aeration MBR by controlling ambient DO concentration. It is postulated that, because of the oxygen diffusion limitation, an anoxic micro-zone was formed inside the flocs where the denitrification might occur. From the results of this study, 96% of COD could be removed at DO of 0.7mg/L. At run 2 72.92% of nitrogen was removed by the mechanisms of SND (7.75mg-TN/L in effluent). In this study, SND was successfully occurred in a MBR due to high MLSS that could help to form anoxic zone inside microbial floc at bulk DO concentrations of 1.3~1.6mg/L.

유입하수에 따른 BNR에서의 N과 P 제거율에 관한 연구

이한섭(Han-Seob Lee),정광보(Kwang-Bo Chung),안성환(Sung-Hwan, Ahn),김경호(Kyung-Ho Kim),원성권(Sung-kwon Won) 한국유화학회 2014 한국응용과학기술학회지 Vol.31 No.4

The amount of waste water generated from the domestic sources is consistently increasing in proportion to economic growth, and the conventional activated sludge process is widely being used for general waste water treatment. But the ministry of environment becomes stringthent treatment standards of N and P (less than 20㎎/L of N, 2㎎/L of P) to prevent the eutrophication of lake water, and therefore highly advanced treatment technology is required not only in the existing treatment plants where the activated sludge process is being used, but also in newly constructed treatment plants for the treatment of N and P. This study is aimed at highly operating the engineering technology method was developed by domestic to eliminate N and P at the same time. Experiments were conducted in the treatment plant located in Yong In city. The bioreactor was started from the principal equipment for the elimination of N and P and the elimination of organic compounds. It consists of an internal recycle piping from the end of the aerobic tank to the anoxic tank and external recycle piping from the final settling basin to the denitrification tank. By experiment of 4 types separate inflow of waste water to the denitrification tank and the anaerobic tank, and changes in staying time at the anoxic tank and the aerobic tank, the elimination of organic compounds in each type and the relationship in the efficiency between the elimination of N and P were researched.

하수처리장 혐기 소화 상징액과 돈사폐수를 이용한 장기간에 걸친 실험실 규모 아질산화 반응 연구

길경익,임지열 한국방재학회 2012 한국방재학회논문집 Vol.12 No.2

In this study, the laboratory scale reactor was operated for high strength ammonium nitrogen in anaerobic digestion supernatant and piggery wastewater through nitritation that is an innovative process of nitrogen removal. From the laboratory scale reactor for about 970 days, a stable nitritation was induced, and the operation factor of induced was analysed nitritation. As a result, a stable nitritation could be successfully induced from anaerobic digestion supernatant and piggery wastewaters. It appeared that nitritation wasn't affected seriously within the range of pH, Alkalinity and COD in influent. In case of SRT, it found that nitrite conversion rate was changed according to SRT condition change, so it showed that SRT had effected on nitritation. In addition,compared to ammonium nitrogen removal, it clearly revealed that nitrite conversion rates more sensitive to SRT. The conclusion in this study, it could be used as an important data when applying nitritation to municipal wastewater treatment plants(MWTPs). 본 연구에서는 혁신적인 질소 제거 방법인 아질산화 반응을 통해 혐기 소화 상징액 및 돈사폐수에 함유된 고농도의 질소를제거하기 위한 실험실 규모 아질산화 반응조를 운전하였다. 약 970일의 장기간에 걸친 반응조 운전을 통하여 안정적인 아질산화 반응을 유도하고, 아질산화 반응의 유도 인자를 연구하였다. 연구 결과 혐기 소화 상징액 및 돈사폐수 모두 안정적인 아질산화 반응을 유도 할 수 있었다. 유입수의 pH, Alkalinity, COD 범위 내에서 아질산화 반응은 큰 영향을 받지 않는 것으로나타났다. 반면 SRT의 경우 그 변화에 따라 아질산화율이 크게 변화하는 것으로 나타나 SRT는 아질산화 반응에 큰 영향을미치는 것으로 나타났다. 또한 아질산화 반응은 암모니아성 질소 제거 반응에 비해 SRT에 더 민감하게 반응하는 것으로 판단된다. 본 논문의 연구 결과는 하수처리장에 아질산화 반응을 적용 시킬 시 중요한 자료로 사용될 수 있을 것으로 판단된다.

유입하수에 따른 BNR에서의 N과 P 제거율에 관한 연구

이한섭,정광보,안성환,김경호,원성권 한국유화학회 2014 한국응용과학기술학회지 Vol.31 No.4

The amount of waste water generated from the domestic sources is consistently increasing in proportion to economic growth, and the conventional activated sludge process is widely being used for general waste water treatment. But the ministry of environment becomes stringthent treatment standards of N and P (less than 20mg/L of N, 2mg/L of P) to prevent the eutrophication of lake water, and therefore highly advanced treatment technology is required not only in the existing treatment plants where the activated sludge process is being used, but also in newly constructed treatment plants for the treatment of N and P. This study is aimed at highly operating the engineering technology method was developed by domestic to eliminate N and P at the same time. Experiments were conducted in the treatment plant located in Yong In city. The bioreactor was started from the principal equipment for the elimination of N and P and the elimination of organic compounds. It consists of an internal recycle piping from the end of the aerobic tank to the anoxic tank and external recycle piping from the final settling basin to the denitrification tank. By experiment of 4 types separate inflow of waste water to the denitrification tank and the anaerobic tank, and changes in staying time at the anoxic tank and the aerobic tank, the elimination of organic compounds in each type and the relationship in the efficiency between the elimination of N and P were researched.

동시 질산화-탈질(SND) 반응을 적용한 MBR 반응조에서 질소 및 인 제거 특성

전동걸(Dong Jie Tian),임현숙(Hyun Suk Lim),안찬현(Chan Hyun An),이봉규(Bong Gyu Lee),전항배(Hang Bae Jun),박찬일(Chan Il Park) 大韓環境工學會 2013 대한환경공학회지 Vol.35 No.10

동시 질산화 탈질은 미세 용존 산소하에 한 반응조내에서 일어난다. 따라서, 본 연구에서는 인 방출을 위해 공기가 공급되는 MBR 전단에 혐기성 존을 만들어주었으며, 높은 DO 농도에서 탈질효율을 향상시켜 주기 위해서는 MBR 내에 배플을 설치하여 무산소 존이 이루어지게 하였다. 그리고 인 제거를 위한 테스트는 MBR 전단의 혐기성 반응조에 알럼 응집제를투입하여 수행하였다. 질소 제거를 위한 SND의 최적 DO 농도 도출은 MBR 내 DO 농도를 2.0, 1.5, 1.0, 0.75 mg/L의 다양한조건에서의 운전을 통해 수행하였다. 심지어 높은 알칼리성 하수라 알럼 응집제를 투입하였을 때 알칼리 용액 첨가 없이도 pH 는 7.0~8.0로 유지되었다. TCODcr와 NH₄+-N의 제거 효율은 모든 DO 농도에서 90% 이상이었다. DO 농도 2.0, 1.5, 1.0, 0.75mg/L에서의 TN 제거효율은 각각 50, 51, 54, 66%이었다. DO 농도 0.75 mg/L 조건에서 알럼을 첨가한 결과 TN 제거효율은 54%로 감소하였다. 혐기성 반응조에 알럼을 투입한 결과 TP 제거효율은 29%에서 95%로 향상되었다. 그리고 알럼 투입 후 분리막모듈의 화학적 세정 주기는 15~20일부터 40~50일으로 늘어났다. Simultaneous nitrification and denitrification (SND) occurs concurrently in the same reactor under micro dissolved oxygen (DO) conditions. Anaerobic zone was applied for phosphorus release prior to an aerated membrane bio-reactor (MBR), and anoxic zone was installed by placing a baffle in the MBR for enhancing denitrification even in high DO concentration in the MBR. Phosphorus removal was tested by alum coagulation in the anaerobic reactor preceding to MBR. DO concentration were 2.0,1.5, 1.0, 0.75 mg/L in the MBR at different operating stages for finding optimum DO concentration in MBR for nitrogen removal by SND. pH was maintained at 7.0~8.0 without addition of alkaline solution even with alum addition due to high alkalinity in the raw sewage. Both TCODcr and NH₄+-N removal efficiency were over 90% at all DO concentration. TN removal efficiencies were 50, 51, 54, 66% at DO concentration of 2.0, 1.5, 1.0, 0.75 mg/L, respectively. At DO concentration of 0.75 mg/L with addition of alum, TN removal efficiency decreased to 54%. TP removal efficiency increased from 29% to 95% by adding alum to anaerobic reactor. The period of chemical backwashing of the membrane module increased from 15~20 days to 40~50 days after addition of alum.

질소제거공정과 결합한 2상 혐기성 소화공정에서 돈분폐수의 메탄생성 및 질소제거

박노백 ( Noh Back Park ),박상민 ( Sang Min Park ),최우영 ( Woo Young Choi ),전항배 ( Hang Bae Jun ) 한국물환경학회 2009 한국물환경학회지 Vol.25 No.1

적조예방을 위한 ASA시스템의 도입 가능성에 관한 연구

강용태,조용현,장성부 東亞大學校海洋資源硏究所 2004 硏究論文集 Vol.16 No.-

To prevent from algal-bloom and red tide outbreak this study was focussed on Biological Nutrient Removal using the novel BNR system, Advanced Step Aeration(ASA) system, which could cope with not only a low level of municipal wastewater but also a high strength of apartment wastewater. Nutrient removals through ASA system were considerably excelent: at influent levels of T-N 40~80mg/l, T-P 4.0~8.0mg/l, respectively, removal efficiencies for T-N and T-P are 70~85% and 90% and effluent level for T-N and T-P are 10~15mg/l and 0.4~0.6mg/l. On the basis of 13℃, nitrification rate(KN) in aerobic tank was calculated to be 0.892 mgN/gMLSSㆍhr. Denitrification rate(KDN) according to C/N ratio from 3.68 to 4.3 and temperature from 13 to 18 ℃ was linearly increased and presented to be from 0.64 to 0.95 mgN/gMLSS ㆍhr. Step-feeding raw wastewater to anaerobic and anoxic tank and using raw wastewater as external carbon source have brought about the improvement of denitrification capacity. Anoxic sludge tank minimized the nitrite and nitrate inhibition in the return activated sludge and maximized phosphorus release through the stable DO control.

적조예방을 위한 ASA시스템의 도입 가능성에 관한 연구

강용태(Kang Yong-Tae),조용현(Cho Yong-Hyun),장성부(Chang Sung-Pu) 동아대학교 해양자원연구소 2004 동아대학교 해양자원연구소 연구논문집 Vol.16 No.-

  To prevent from algal-bloom and red tide outbreak this study was focussed on Biological Nutrient Removal using the novel BNR system, Advanced Step Aeration(ASA) system, which could cope with not only a low level of municipal wastewater but also a high strength of apartment wastewater. Nutrient removals through ASA system were considerably excelent: at influent levels of T-N 40~80㎎/l, T-P 4.0~8.0㎎/l, respectively, removal efficiencies for T-N and T-P are 70~85% and 90% and effluent level for T-N and T-P are 10~15㎎/l and 0.4~0.6㎎/l. On the basis of 13 ℃, nitrification rate(KN) in aerobic tank was calculated to be 0.892 ㎎N/gMLSSㆍhr. Denitrification rate(KDN) according to C/N ratio from 3.68 to 4.3 and temperature from 13 to 18 ℃ was linearly increased and presented to be from 0.64 to 0.95 ㎎N/gMLSSㆍhr. Step-feeding raw wastewater to anaerobic and anoxic tank and using raw wastewater as external carbon source have brought about the improvement of denitrification capacity. Anoxic sludge tank minimized the nitrite and nitrate inhibition in the return activated sludge and maximized phosphorus release through the stable DO control.

Aerobic Denitrification by a Heterotrophic Nitrifying-aerobic Denitrifying (HN-AD) Culture Enriched Activated Sludge

최경진,Shan Zhang,송지현,황선진 대한토목학회 2017 KSCE JOURNAL OF CIVIL ENGINEERING Vol.21 No.6

Heterotrophic nitrifying bacteria capable of denitrification under aerobic conditions, which are known as HN-AD species, were investigated. Instead of the isolation and subsequent cultivation of a pure HN-AD strain, the activated sludge obtained from the domestic wastewater treatment plant was enriched to enhance the fraction and activity of the indigenous HN-AD species by adding ammonium and organic carbon. The enriched culture showed both rapid ammonium removal at a rate of 13.3 mg-N/L/hr and nitrate removal at a rate of 12.3 mg-N/L/hr, which was higher than those for the pure HN-AD bacteria reported in the literature. On the contrary, the activated sludge that was not enriched showed insignificant nitrification and aerobic denitrification. These results implied that the selective enrichment procedure improved the fraction and/or activity of the HN-AD culture in the mixed biomass. Consequently, the enriched HN-AD culture from activated sludge could be a feasible alternative over the conventional BNR process.

좀개구리밥(Lemna minor)의 N, P 제거능 및 공배양 가능성 평가

김정수,남귀숙,황선진 한국폐기물자원순환학회 2018 젊은 연구자 학술연구발표회 Vol.16 No.0