• 한국물환경학회지
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• 제22권2호
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• pp.203-208
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• 2006

A continuous feed and cyclic draw SBR process was developed to overcome flow rate fluctuation and to maximize organic matters utilization efficiency for nitrogen and phosphorus removal. The developed SBR process was operated with two parallel reactors. Influent was supplied to one reactor which was not obligately aerated. At the same time, the other reactor was just aerated without supplying influent. In addition this mode was changed periodically. Cycle time was 6hr and aeration time ratio($t_{aer}/t_{total}$) was 0.33, respectively. $COD_{cr}$ and SS removal efficiencies of 95% or higher were achieved. Nitrogen removal was so greatly influenced by influent $COD_{cr}/T-N$ ratio. At influent $COD_{cr}/T-N$ ratio of 5.7, removal efficiencies of ammonia-N, T-N and T-P were 96%, 78% and 55%, respectively. Influent $COD_{cr}/T-N$ of 4 or higher ratio was necessary to achieve 60% or higher nitrogen removal. Organic matters of influent was efficiently utilized in denitrification reaction and consumed COD has a good correlation with removed T-N(about 6.5 mgCOD/mgTN). Continuous feed and cyclic draw SBR process could be one of alternative processes for the removal of nutrients in rural area where $COD_{cr}/T-N$ ratio was low and fluctuation of flow rate was severe.

• 한국생물공학회:학술대회논문집
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• 한국생물공학회 2003년도 생물공학의 동향(XIII)
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• pp.141-142
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• 2003

• 한국대기환경학회:학술대회논문집
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• 한국대기환경학회 2008년도 춘계학술대회 논문집
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• pp.126-127
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• 2008

• 한국생물공학회:학술대회논문집
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• 한국생물공학회 2005년도 생물공학의 동향(XVII)
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• pp.447-447
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• 2005

• 한국어업기술학회:학술대회논문집
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• 한국어업기술학회 2003년도 춘계 수산관련학회 공동학술대회발표요지집
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• pp.219-220
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• 2003

The success of recirculating system depends largely on the treatment efficiency of waste generated in the system. fine solids were suspected to be responsible for fish kill in a recirculating system. Clogging of biofilter may be induced by high solids concentration in recirculating systems. Also, the solids could generate more ammonia nitrogen and oxygen demand if not removed out of recirculating system as soon as possible (Weeks et al., 1992). (omitted)

• 한국농업기계학회:학술대회논문집
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• 한국농업기계학회 2005년도 동계 학술대회 논문집
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• pp.42-46
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• 2005

• 한국대기환경학회:학술대회논문집
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• 한국대기환경학회 1999년도 추계학술대회 논문집
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• pp.459-460
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• 1999

자외선을 이용한 분자의 광분해반응은 석유화학, 고분자합성 및 신물질 개발 등의 화학공정분야에 널리 이용되고 있으나, 기존의 환경오염물질을 처리하는 기술에 대한 응용은 아직 미역하다. 한편 전자빔이나 플라즈마를 이용한 환경오염물질의 처리방법에 대한 연구는 여러 연구기관들을 통하여 꾸준히 연구, 발표되고 있으나, 아직까지는 이러한 기술을 산업현장에 적용하기에는 실제적인 어려움과 실제 공정에 적용시 외국 기술에 비해 상대적으로 많은 비용으로 인하여 어려움을 겪고 있다.(중략)

• 한국섬유공학회:학술대회논문집
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• 한국섬유공학회 2003년도 가을 학술발표회 논문집
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• pp.153-154
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• 2003

최근 대기오염이 건강에 미치는 영향에 대한 연구가 본격적으로 시작되면서 대기오염의 심각성을 보여주는 각종 사례들이 보고 되고 있으며, 일반인도 더 이상 도시 대기오염의 수준이 안전하지 않다는 인식을 갖게 되었다. 이러한 대기 오염의 원인으로는 여러 가지가 있겠으나, 이 중 암모니아는 무색의 가연성 가스로 보통 재래식 화장실에서 맡을 수 있는 특유의 자극적인 냄새로 고농도의 암모니아를 맡으면 인체에 만성적 질환뿐만 아니라 지속적인 흡입 시에는 호흡정지를 일으킬 수 있다고 보고 되고 있다. (중략)

• Archives of Pharmacal Research
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• 제13권4호
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• pp.306-309
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• 1990

The synthesis of 5-hyterocyclimethyl-2'-deoxyuridines (4a-f) has been accomplished by displacement reaction of 5-(bromomethyl)-3', 5'-di-O-acetyl-2'-deoxyuridine with heterocyclic compounds, followed by removal of acetyl protecting group with methanolic ammonia. The compoudns synthesized were evaluated the inhibitory effects on L1210 cell probiferation and antiviral activities against Herpes simplex virus type 1 (HSV-1) None of the compounds exhibited sufficient biological activities.

• Biotechnology and Bioprocess Engineering:BBE
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• 제7권1호
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• pp.31-37
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• 2002

This paper was investigated to clarify the possibility of a biodegradation of materials adsorbed on different porous granular-activated carbons (GACs) such as coal-& coconut-based GAC. Total organic carbon, humic substance and ammonia were used to compare their removal efficiencies. The objective of this study is to determine the adsorption capacity of bioregenerated GAC. When raw water reacted with chloride, the yield of THMs increased as a function of the input amount of chloride. The formation of trihalomethanes (THMs) was investigated in water treated with chlorine when humic acid was used as THM precursor. As the input amount of chloride in raw water increased by two or five-fold to remove the $NH_3$, the chloroform of the THMs significantly increased also five or ten-fold. It was found that the chloroform was significantly removed by the treatment of biological activated carbon (BAG) in comparison with the ozone treatment, and the removal efficiency of THMs in coal-typed GAC was $10-30\%$ better than coconut-typed GAC due to the biological degradation on the surface of the activated carbons.