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지재성,김종수 선문대학교 첨단과학기술연구소 1996 첨단과학기술연구소 논문집 Vol.1 No.1
암모니아 질소의 생물학적 처리는 호기성 질산화와 혐기성 탈질화의 연속 공정에 의하며 각 공정은 중간대사물인 아질산을 생성한다. 본 연구에서는 암모니아성 질소를 호기성 질산화에서 중간대사물인 아질산으로 축적함에 의하여 최종 생성물인 질산을 거치지 않고 탈질화에 의하여 질소가스로 제거를 시도하였다. 실험에서 암모니아 질소원은 하수처리장의 혐기성 소화조 상등액을 사용하였고 반응공정은 연속 회분식 반응조를 (SBR) 사용하였다. 질산화 공정에서 아질산의 축적을 위한 그리고 탈질화 공정에서 효율적 아질산의 질소 가스로 환원을 위한 각 공정의 반응속도와 운전조건을 평가하였다. 질산화 공정에서 아질산의 축적은 아질산의 존재하에서 암모니아를 반응기에 주입하여 아질산 산화균인 Nitrobacter를 억제하여 이루어 질 수 있었다. 연속적으로 포기한 질산화반응기내 고형물체류시간이 2.5일에서 3일로 길어짐에 따라 아질산을 질산으로 산화는 촉진되었으나 포기와 비포기의 기간을 적절히 조절함에 의하여 고형물체류시간 5일에서도 아질산의 축적은 유도되었다. 반응기의 비포기 기간에 탄소원을 공급함으로서 아질산의 탈질화 반응이 유도될 수 있었다. Biological ammonia-nitrogen removal utilizes two distinct processes, nitrification and denitrification. Both nitrification and denitrification processes produce nitrite as intermediate product. Forced accumulation of nitrite in the nitrification process, eliminating nitrite oxidation to nitrate step, was attempted in order to directly remove nitrite by denitrification to nitrogen gas. For this study the supernatant from an anareobic digester was used as an ammonia source and a sequencing batch reactor (SBR) was employed. Emphasis was given to the evaluation of the operational factors affecting nitrite accumulation and the development of a kinetic model for biological nitrification and denitrification. Forced accumulation of nitrite in the nitrification was achieved by suppressing the growth of Nitrobacter, a nitrite oxidizer, by loading a high ammonia supernatant immediately after all ammonia in the previous loading was oxidized to nitrite. Nitrite oxidation was incresed by increasing the solid retention time (SRT) from 2.5 days to 3.0 days in a continuous aeration mode with everyday feeding. However, nitirte was accumulated even at an SRT of 5 days when the aeration and non-aeration periods were appropriately combined under the same operational conditions. The non-aeration period can be used for denitrification from the accumulated nitrite when a carbon source is supplied.
Antitumorigenic Effects of Tannin from Persimmon Leaves on Sarcoma 180 - induced Tumor in Mice
Sung-Chai Moon,Kyong-Hee Choi,Tae-Hyong Rhew,Kun-Young Park,Byeong-Gee Kim 한국식품영양과학회 1998 Preventive Nutrition and Food Science Vol.3 No.1
The changes of morphology and protein pattern of sarcoma 180 cells treated with or without tannins extracted from persimmon leaves were evaluated by light microscopy, electrophoresis and Western blotting. The sarcoma 180 cells treated with tannins increased the amount of proteins which presumably were intermediate filament cytokeratins detected by electrophoresis and Western blot. Tannins was indirectly cytotoxic to the sarcoma 180 cells and increased the intermediate filament protein level in the cells.
Antitumorigenic Effects of Tannin From Persimmon Leaves on Sarcoma 180-induced Tumor in Mice
Moon, Sung-Chai,Park, Kyong-Hee,Rhew, Tae-Hyong,Park, Kun-Young,Kim, Byeong-Gee The Korean Society of Food Science and Nutrition 1998 Preventive Nutrition and Food Science Vol.3 No.1
The changes of morphology and protein pattern of sarcoma 180 cells treated with or without trannins extracted from persimmon leaves were evaluated by light microscopy, electrophoresis and Western blotting. The sarcoma 180 cells treated with tannins increased the amount of proteins which presumably were intermediate filament cytokeratins detected by electrophoresis and Western blot. Tannins was indirectly cytotoxic to the sarcoma 180 cells and increased the intermediate filament protein level in the cells.
WASTE MANAGEMENT STRATEGIES TO EXTEND LANDFILL LIFETIME
( Jae-chun Chung ),( Chai-sung Gee ),( Jae-woong Lee ) 한국폐기물자원순환학회 2002 APLAS Vol.2002 No.1
Landfill is an ultimate disposal method. According to the intergrated waste management principle, the last priority is landfill, which means that wise waste management is to extend landfill lifetime by maximizing landfill diversion. There are three important methods to extend landfill lifetime. First one is the waste minimization, To implement the realistic waste minimization policy, minimization goal should be set by the central and local governments. The important parts in the waste minimization policy are food and organic waste, packaging waste and construction and demolition waste. Minimization at the generation is the key factor for the food and organic waste management. In the organic waste recycling policy, the first priority should be given to the composting rather than the animal feed production from organic waste. Large scale animal feed production from organic waste is dangerous due to communicable diseases such as mad cow disease and foot and mouth disease. Compost product from organic waste can be used as soil conditioner in the forest. The pH of forest soil in Korea is 4.2~4.6, which is acidic. The soil pH could be amended to neutral range by the application of compost. It is desirable to apply pelletized compost by airplane. That is the single large demand sector and most desirable use for compost. The second method to extend landfill lifetime is to adopt mining and recycling landfill system, in which the landfill is mined and reused cyclically. In the system, landfill site is divided into usually three sections: active landfill section, rapid stabilization section, and mining and recycling section. This landfill system have some significant advantages. By adopting this landfill system, landfill lifetime can be remarkably extended. It's operational cost is considerably low comparing to the other landfill system and maintenance is relatively easy. Recyclables such as compost, metals and plastics can be recovered from the landfill site. In this system, leachate is recycled by pumping to the top of landfill, thereby saving significantly the leachate treatment cost. This system can be adopted especially for the medium and small size landfill and closed landfill sites. By adopting this system for a closed landfill site, we can renew the old landfill site to a new one. The third method to extend lanfill lifetime is to use artificial daily cover. Currently foam or paper slurry is commonly sprayed. The thickness of artificial daily cover can save remarkably the landfill space thereby considerably extending landfill lifetime.
중공사 정밀여과막 활성슬러지법 ( ASMF ) 에 의한 생활하수의 분리특성에 관한 기초연구
박재로,지재성,김응호 ( Jae Roh Park,Chai Sung Gee,Eoung Ho Kim ) 한국물환경학회 1997 한국물환경학회지 Vol.13 No.2
The Purpose of this study is to investigate the seperation characteristics of high concentration domestic sewage using activated sludge process combined with hollow fiber microfiltration membrane and to find out the operating parameter for ASMF Process. A hollow fiber microfiltration membrane module with a pore size 0.1micron was immersed in the aeration basin(0.4㎥) and treated water was filtered through the membrane by intermittent suction with low pressure of 400mmHg(about 0.5kgf/㎠). In this experiment, various operational mode were applied to investigate stable permeate flux conditions as well as optimal suction-idle cycle and effective aeration intensity. The BOD, COD and LAS removal efficiency were higher than 85% and SS, Turbidity removal efficiency was about 100% but color removal efficiency was lower than 60%. As the results, the stable permeate flux range was 9 ℓ/ ㎡/hr∼12 ℓ/ ㎡/hr, the optimal suction-idle cycle was 10min-10min and the aeration intensity condition of 320 ℓ/㎥min was sufficient to keep both stable permeate flux and aerobic basin condition. During the experimental period, cumulating fouling and internal clogging in the membrane were inevitable to some extent. However, the optimal permeate flux, intermittent suction, and low suction pressure operation could prevent the unrecoverable fouling and dead end of operation without frequent chemical cleaning.