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이윤석,안승구 한국물환경학회 1986 한국물환경학회지 Vol.2 No.1
슬럿지의 안정화와 위생처리를 위한 연속흐름식 및 반 연속식 반응조에 반응열을 이용한 친열호기성 소화에 대한 Model이 설정되었다. 반응속도식은 생물학적 분해가능한 유기고형물 농도에 대한 1차반응식을 적용하였으며 산소농도에 대한 영향을 파악하기 위하어 하나의 항을 추가로 삽입하였다. simulation을 위하여 계수나 운전요건들은 대부분 실측된 자료들이 사용되었으며 발효액에서 실측된 mixing unit의 에너지 주입 및 산소 전달특징을 고려하였다. 관측된 결과들은 아래와 같다. (1) 효율적인 슬럿지의 안정화의 위생처리를 위하어 글럿지의 농도가 높아야 되며 단열상태가 좋아야 한다. (2) impeller의 회전수와 공기주입속도에 대한 적절한 운전점은 유기물제거속도(r_(eff))의 증가뿐만 아니라 효율(E) 즉 단위에너지 주입에 대한 유기물 제거량도 고려하여 선정되어야 한다. (3) Batch와 연속흐름식 그리고 반 연속식 운전의 비교로부터 반 연속식 운전이 슬럿지의 안정화와 위생처리에 효과적이며 이것은 Batch 식보다 체류기간은 길지만 저조류가 필요없고 또 외부조건(독성물질등)에 덜 민감하며 연속식운전보다 체류기간이 짧다는 장점을 지닌다. (4) 이론치와 실측치의 비교는 일부 추측에 의한 값들도 적용되었지만 해당 글럿지에 대한 반응계수들이 측정된다면 이론에 의한 Model로 실측값에 상당히 접근될 수 있을 것이다. Models of the autothermal thermophilic aerobic digestion process for stabilization and pasteurization of sewage sludge were proposed. They can be applied to the continuous and semi-continuous operations in completely stirred tank reactor. Oxygen concentration term was added to the first order reaction kinetic to investigate the influence of the oxygen concentration on the reaction rate. Sludge was considered as a nonnewtonian (pseudoplastic) fluid. For the effective operation of the process the sludge concentration must be high and the thermal protection of the reactor with isolation material should be required. The RPM of turbine impeller and the air supply velocity must be selected on the basis not only of the organic removal rate but also of the efficiency; quantity of the removal organics per unit energy input. Also the semi-continuous operation appears one of the most effective process for the stabilization and pasteurization of the sludge.
Aeromonas hydrophila KH-54 가 분비하는 유기폐수처리용 생물응집제 생산조건의 최적화
이윤석,윤주환,조홍연,이정석,서호찬 한국농화학회 1998 Applied Biological Chemistry (Appl Biol Chem) Vol.41 No.6
For the need of bio-degradable flocculant in stage of wastewater treatment, some cultural conditions of bioflocculant production were optimized with Aeromonas hydrophila KH-54. About 260 strains of type culture and bacteria isolated from marsh, pond, activated sludge, etc were examined for their ability to flocculate kaolin particles and swine wastewater. Among them, KH-54 showed the highest flocculating activity and was identified as Aeromonas hydrophila according to the cultural, morphological and physiological properties. The maximum production of the flocculant secreted by Aeromonas hydrophila KH-54 was observed in culture medium containing 2.0% mannitol, 0.05% ammonium chloride, 0.02% potassium phosphate dibasic, 0.01% MgSO₄· 7H₂O and 0.05% yeast extract at initial pH 7.0 when cultured on rotary shaker controlled at 25℃ and 150 rpm. Under the optimized condition, the flocculating ability reached to 770 units/㎖ of kaolin flocculating activity and 81% of NTU removal efficiency against swine wastewater after 4 days cultivation. The bioflocculant was also effective on various organic wastewaters other than swine wastewater, showing NTU removal rate ranging from 92% to 34%.
이윤석,최의소,임봉수 대한상하수도학회 1994 상하수도학회지 Vol.8 No.3
The depth of sewers in residential complexes was determined to prevent the separated sewers from misconnection between storm sewer and sanitary sewer, and from the submersion of the basement by minimizing the phenomenon of backwater when it rains. In residential complexes, main causes of the submersion were the misconnection of sewers, rising of the backwater level at outfall in sewer system, poor maintenance of sewers, and lacking in their cross section. Minimum depth of sewers should be over 1.2~1.5m. According to the economic analysis, the depth of 1.5m~3.0m was appropriate for minimizing the submersion of basements and for making the disposal of domestic wastewater more easily.