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생물화공 , 에너지 / 환경 : 무산소 - 호기 상향류식 생물여과 반응기에서 질산화 및 탈질 연구
이수철(Soo Choul Lee),김동진(Dong Jin KIm) 한국화학공학회 2001 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.39 No.1
This study was carried out to investigate the effects of influent NH₄^+ - N load, C/N ratio, and superficial air velocity on the biological nitrogen removal efficiencies of a biological aerated filter. The laboratory scale upflow anoxic-oxic biological aerated filter(AO-BAF) with porous ceramic media was continuously operated for nitrification and denitrification with synthetic wastewater. Various influent C/N ratios and superficial air velocity had been applied to investigate their effects on nitrogen removal. The AO-BAF showed more than 90% NH₄^+-N removal efficiencies in the ranges of 0.26-1.76 ㎏ NH₄^+-N/㎥ ·d and an average 65% of T-N removal efficiencies at the C/N ratio of 1. The reactor is very compact in size when considering the empty bed contact time(EBCT) of 1.1 h and the hydraulic retention time(void fraction: 35%) of 0.38 h. The average T-N removal efficiencies were increased with the superficial air velocity because of the enhanced nitrification efficiencies. Some parts of the denitrification occurred in aerobic nitrification zone where organic carbons are rarely available. It is likely that the denitrification without organic carbon may be the anaerobic ammonium oxidation due to the oxygen mass transfer resistance within the biofilms even though the mechanism is still unclear.
생물막 반응키에서의 폐수 처리 및 Fluorescence In Situ Hybridization에 의한 복합 미생물계 구조 해석
김동진,한동우,이수철,박병곤,권일,성창근,박완철,Kim, Dong-Jin,Han, Dong-Woo,Lee, Soo-Choul,Park, Byeong-Gon,Kwon, Il,Sung, Chang-Keun,Park, Wan-Cheol 한국생물공학회 2002 KSBB Journal Vol.17 No.1
유기물 제거뿐만 아니라 안정적으로 질소와 인의 동시 제거를 위한 순환식 생물막 반응기를 제작, 운전하여 최적의 운전 인자를 도출하고, 질소 제거의 텃 번째 단계인 질산화 및 뒤이은 탈질에 관여하는 미생물들의 군집 구조 분석을 수행하였다. 유기물 제거와 질소와 인의 동시 제거를 위한 순환식 생물막 반응기는 143일 동안 운전되었다. 이 결과 $COD_{cr},\;BOD_5$, SS의 경우 각각 88, 88, 97%의 평균 제거효율을 보였다 이 기간 중 질산화율은 약 96% 정도로 유입 ${{NH_4}^{+}}_{-}N$의 대부분이 제거됨을 보였다. 하지만 탈질율은 평균 45% 정도로 나타났다. 반응기로 유입되는 총 인의 경우 약 44%가 제거되었다. 질소제거의 첫 번째 단계인 질산화가 일어나는 호기성 반응조 내 질산화 미생물의 경우 FISH 관찰 결과, 주요 암모니아 산화균 및 아질산 산화균으로는 Nitrosomonas spp.와 Nitrospira sap.가 관찰되었다. 또한 탈질 반응이 일어나는 준혐기성 반응조에서는 Rhodobacter, Rhodovulum, Roseebacter 그리고 Paracoccus 속에 속하는 탈질 미생물들이 전체 미생물의 약 10~20% 정도를 차지하며 분포하였다. Laboratory scale aerobicfanaerobic biofilm reactor was used for simultaneous and stable removal of organics, N and P components to investigate optimum design and operation parameters and to analyze the microbial distribution and consortium structure of nitrification and denitrification bacteria in aerobic and anaerobic biofilm systems. The biofilm reactor was successfully operated for 143 days to show $COD_{cr},\;BOD_5$, SS removal efficiencies of 88, 88, and 97%, respectively. During the experiment period, almost complete nitrification efficiency of 96% was achieved. Denitrification efficiency was about 45% without addition of any external carbon sources. In case of total phosphorus removal, 74% of the inlet phosphorus was removed. Fluorescence in situ hybridization (FISH) results showed that most of the ammonia oxidizing bacteria in the aerobic nitrification zone was found to be Nitrosomonas species while Nitrospira was the representative nitrite oxidizing bacteria. For the denitrification, Rhodobacter, Rhodovulum, Roseebacter and Paracouus were the dominant denitrification bacteria which was 10 to 20% of the total bacteria in numbers.
윤지현,전중규,전찬기,이수철,Yoon, Ji-Hyun,Jeon, Joong-Kyu,Jeon, Chan-Ki,Lee, Soo-Choul 한국건설순환자원학회 2012 한국건설순환자원학회지 Vol.7 No.2
터널현장의 숏크리트 시공에 사용되는 강섬유 보강 숏크리트는 강섬유의 강성이 크고 중량이 무거워 숏크리트 시공상 어려움이 있으며, 강섬유의 부식과 높은 반발률 등이 개선사항으로 요구되고 있다. 이에 본 연구에서는 강섬유 보강 숏크리트의 단점을 개선하기 위하여 폴리아미드섬유를 혼입한 숏크리트를 제안하고, 현장 적용성 평가를 위하여 시험시공 결과를 제시하였으며, 그 결과 다음과 같은 결론을 얻었다. 1) 폴리아미드섬유 보강 숏크리트의 역학적 성능은 국내의 터널관련 설계기준을 만족하며, 기존 강섬유 보강 숏크리트와 동등 수준의 역학적 성능을 나타내었다. 2) 폴리아미드섬유 보강 숏크리트는 강섬유 보강 숏크리트에 비해 시공시 반발률이 저감되어 시공성 뿐만 아니라 경제성, 품질, 친환경성 측면에서 우수한 숏크리트라 할 수 있다. Steel fiber reinforced shotcrete in tunneling construction has some problems in terms of constructability, durability and lots of rebound wastage. In order to resolve these problems, this pater proposes polyamide fiber reinforced shotcrete technology. And this paper presents the results of experimental construction of the polyamide fiber reinforced shotcrete technology. The results of the study are as follows. 1. The polyamide fiber reinforced shotcrete suggested in this paper shows outstanding mechanical performance that meets various Korean tunnel construction design criteria. 2. In addition, the results of experimental constructions show that the polyamide fiber reinforced shotcrete creates less rebound and wasted product than the steel fiber reinforced shotcrete. Based on the above results, it is concluded that the polyamide fiber reinforced shotcrete technology can be used as economical and environmentally friendly construction of tunnel.
생물화공 에너지 / 환경 / 혐기성 선택조가 결합된 순산조 활성슬러지 공정의 고지재생 폐수처리 및 슬러리 침전 특성
김동진(Dong Jin Kim),이수철(Soo Choul Lee) 한국화학공학회 2000 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.38 No.4
When organic and hydraulic loads exceed the treatment capacity, the existing activated sludge wastewater treatment plants are need to be expanded or retrofitted to meet the regulation. Laboratory scale anaerobic selector coupled pure oxygen activated sludge(AS-POAS) was developed to treat paper regeneration wastewater economically as one of the alternatives of the plant modification. Pure oxygen bioreactor and anaerobic selector were introduced to improve the treatability of organic load and sludge settling property, respectively. The AS-POAS showed 74% average COD removal ratio at the range of 0.4-3.4 ㎏ COD/㎥·day. In the selector COD removal rate was 5.9 ㎏/㎥·day, which is about 4.5 times of pure oxygen bioreactor. The selector provided the floc forming bacteria as the dominant microorganisms and accelerate sludge settling characteristics. SVI value was kept less than 100 and showed high sludge settling properties when pH was controlled higher than 6.
김종인,이수철,김태형 대구대학교 산업기술연구소 2003 産業技術硏究 Vol.15 No.1
In performing a risk analysis of structure for earthquake, it is imperative to identify the vulnerability of structures associated with various stages of damage. And the earthquake resisting capability is needed for structures like bridge. So the damage analysis of bridges with or without isolator for earthquake effects is necessary. In this paper, the method for construction of fragility curve is presented. In doing that. general purpose structural analysis program and generally used probability density function are used. The results of structural analysis are represented by Bernoulli distribution which says damage or no damage. By the use of Maximum Likelihood Method. two parameters of lognormal distribution -median and standard deviation - are found. With them, the fragility curves are constructed. In this paper, the fragility curves of bridge are constructed with respect to PGA(Peak Ground Acceleration). The results of this study are as follows: (1) As the result according to research, we got the Fragility Curve to have median and standard deviation as 0.242 0.262 respectively. (2) For PGA, the fragility curve is distributed on relatively wide range of PGA. So it can be a good measure for evaluation of damage effect with respect to PGA.