• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1992년도 한국자동제어학술회의논문집(국내학술편); KOEX, Seoul; 19-21 Oct. 1992
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• pp.502-506
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• 1992

In this study, we proposed the fuzzy modeling method and designed a model-based logic controller for Activated and Sludge Process(A.S.P.) in sewage treatment. The identification of the structure of fuzzy implications is carreid out by use of fuzzy c-means clustering algorithm. And to identify the parameters of fuzzy implications, we used the complex and the least square method. To tune the premise parameters automatically the complex method is implemented. The model-based fuzzy controller is designed by rules generated from the identified A.S.P. fuzzy model. The feasibility of the proposed approach is evaluated through the identification of the fuzzy model to describe an input-output relation of the A.S.P.. The performance of identified model-based fuzzy controller is evaluated through the computer simulations.

• Journal of Microbiology and Biotechnology
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• 제19권1호
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• pp.93-98
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• 2009

The thermophilic aerobic digestion (TAD) process is recognized as an effective method for rapid waste activated sludge (WAS) degradation and the deactivation of pathogenic microorganisms. Yet, high energy costs due to heating and aeration have limited the commercialization of economical TAD processes. Previous research on autothermal thermophilic aerobic digestion (ATAD) has already reduced the heating cost. However, only a few studies have focused on reducing the aeration cost. Therefore, this study applied a two-step aeration control strategy to a fill-and-draw mode semicontinuous TAD process. The NADH-dependent fluorescence was monitored throughout the TAD experiment, and the aeration rate shifted according to the fluorescence intensity. As a result, the simple two-step aeration control operation achieved a 20.3% reduction in the total aeration, while maintaining an effective and stable operation. It is also expected that more savings can be achieved with a further reduction of the lower aeration rate or multisegmentation of the aeration rate.

• Environmental Sciences Bulletin of The Korean Environmental Sciences Society
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• 제1권1호
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• pp.11-17
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• 1997

The treatment performances of anaerobic-aerobic activated sludge process were investigated under various operation conditions. The treatment system proposed in this study gave a relatively stable performance against hourly change of the flow rate and showed a satisfactory removal efficiency of nitrogen and phosphorus compounds under experimental conditions. The average removal efficiency of total nitrogen gradually decreased as the influent total nitrogen concentration was increased. High C/N ratio of the wastewater was required for the complete removal of nitrogen. Glucose as a carbon source was more efficient than starch and the removal ability for all components become higher with the increase of the fraction of glucose.

• 한국환경과학회지
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• 제1권1호
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• pp.11-17
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• 1992

The treatment performances of anaerobic-aerobic activated sludge Process were investigated under various operation conditions. The treatment system proposed in this study gave a relatively stable performance against hourly change of the flow rate and showed a satisfactory removal efficiency of nitrogen and phosphorus compounds under experimental conditions. The average removal efficiency of total nitrogen gradually decreased as the influent total nitrogen concentration was increased. High C/N ratio of the wastewater was required for the complete removal of nitrogen. Glucose as a carbon source was more efficient than starch and the removal ability for all components become hither with the increase of the fraction of glucose.

• Carbon letters
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• 제4권2호
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• pp.64-68
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• 2003

A study on the electrosorption of uranium ions onto a porous activated carbon fiber (ACF) was performed to treat uraniumcontaining lagoon sludge. The result of the continuous flow-through cell electrosorption experiments showed that the applied negative potential increased the adsorption kinetics and capacity in comparison to the open-circuit potential (OCP) adsorption for uranium ions. Effective U(VI) removal is accomplished when a negative potential is applied to the activated carbon fiber (ACF) electrode. For a feed concentration of 100 mg/L, the concentration of U(VI) in the cell effluent is reduced to less than 1 mg/L. The selective removal of uranium ions from electrolyte was possible by the electrosorption process.

• 멤브레인
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• 제11권4호
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• pp.170-178
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• 2001

상전환 방법에 의해 PVC계 MF막을 제조하여 환성슬러지가 포함된 폐수 처리용 MBR (Membrane bioreactor)에 적용하였다. 막 제조시 첨가제의 농도에 따른 막 특성을 확인한 결과 첨가제의 농도가 증가할수록 기공 크기가 증가하였으며 친수화도 역시 향상되었다. MBR의 내부 환경변화에 따른 실험을 통해 제조한 막의 투과 성능 및 막에 발생하는 막 오염 거동을 조사하였다. 사상균의 생성으로 인한 Sludge bulking 시 막 오염 현상이 가속화되었으며, 이 때 각 시료의 Rc을 조사한 결과 CP-0 > CP-1.0 > CP-1.5의 순으로 나타났고, 정상상태와 비교하여 sludge busking시 Rc값은 3.5~7배가지 증가하였다. 표면 특성이나 투과 유속면에서 PVP 1.5 wt% (CP-1.5)를 첨가하였을 때가 가장 적합하였다. 평균 투과 유속은 시료 모두에서 12(${\pm}$2) L/$m^2$hr 정도였으며, 평균 COD 제거율은 98.8% 정도를 나타내었다 MBR 운전에 있어 sludge bulking시 사상균이 차지하는 비율과 미생물의 모양과 크기에 따라 막 오염은 가속화 되었고, 투과 유속 감소를 보였다. 따라서 막 여과 특성은 막의 친수화 정도와 MBR 내부 미생물의 성장 조건과 환경에 의해 결정되는 것을 알 수 있었다.

• 수산해양기술연구
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• 제14권1호
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• pp.43-54
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• 1978

생물학적 폐수처리 공법중 활성 슬러시지 공법의 수학적 해법에 관한 연구는 Michaelis-Menton, Monod, Eckenfelder, McKinney 등에 의하여 개발되어왔다. 이들에 의해서 개발된 수학적 모델은 각기 연구되어 온 측면이 서로 다르고, 사용된 기호가 상이하기 때문에 사용자로 하여금 많은 혼란을 주고 있다. 본연구는 각기 수학적 모델을 이론적, 단편적으로 분석하고, 각기 모델에서 사용된 기호의 상호관계를 비교하여 각기모델을 통일시켜 사용자가 이해하기 쉽도록 노력하였다. 실제로 모형실험에는 Aeration Only Activated Sludge 공법을 채택하고 시료는 Glutamic acid 폐수로 행하였다. 실제로 처리하여 얻어진 결과치와 각기모델의 계산치를 1) 유기물제거속도 2) 슬럿지생산비 3) 유출수에 관리되지 않고 남은 유기물농도 4) 폭기조내 산소요구량에 대하여 비교 검토하였다. 본연구에서 시행한 운전결과와 그분석으로부터 McKinney와 Eckenfelder의 모델은 활성슬럿지공법의 생물학적 관리시설의 설계요소들을 모두 구할수 있으나 Michaelis-Menton과 Monod의 모델은 모든 요소들을 구할수 없다.

• 한국막학회:학술대회논문집
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• 한국막학회 2000년도 춘계 총회 및 학술발표회
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• pp.113-116
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• 2000

• 한국환경보건학회:학술대회논문집
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• 한국환경보건학회 2001년도 춘계 학술대회
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• pp.53-54
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• 2001

• 수도
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• 통권21호
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• pp.24-32
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• 1980