http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Oa, S. W.,Choi, E.,Kim, S. W.,Kwon, K. H.,Min, K. S. IWA Publishing 2009 Water Science & Technology Vol.59 No.11
<P>A method evaluating the economic efficiency of piggery waste treatment plant based on kinetics for nitrogen removal performances is executed in this study and five full scale plants were evaluated, monitored intensively during one year under steady-state conditions. The performance data from those surveyed plants were recalculated by first-order kinetic equation instead of the Monod's equation, and the nitrogen removal kinetics related with COD/TKN ratios. Two plants adapting two extreme strategies for pre treatment, ‘excess phase separation’, and ‘minimum phase separation’, were evaluated by the assessment of life cycle cost (LCC). Although the compared two plants use an opposite strategy to each other, similar evaluation results are deduced by nitrogen removal efficiencies and operational and construction costs. But the proportions of constituent elements are as different as two opposite strategies, so electrical and construction costs are inversely proportional to chemical costs and operational costs respectively.</P>
OA, SEONG-WOOK,KIM, GEONHA,KIM, YOUNG Taylor Francis 2006 Journal of environmental science and health. Part Vol.41 No.10
<P>Groundwater contaminated by nitrates occurs frequently. In this research, fumarate, acetate, formate, lactate, propionate, ethanol, and methane were evaluated as a potential electron donor and carbon source by comparing the denitrification rate for the in situ bioremediation of nitrate contaminated groundwater. The denitrification rate for each substance was the quickest in the order of: fumarate > hydrogen > formate/Lactate > ethanol > propionate > methanol > acetate. Microcosm studies were performed with fumarates and acetates. When fumarates were used as a substrate, nitrates were removed completely at a rate of 0.66mmol/day, while the conversion rate from nitrate to nitrogen gas and other by-products was 87%. For the microcosm test, 42 mg of fumarates were needed to remove 30 mg of NO<SUB>3</SUB><SUP>−</SUP>-N/L. When using acetate as a sole carbon source, 31% of nitrates were removed during the initial adjustment period. Among the removed fractions, however, 83% of the nitrates were removed by the cell growth. Overall, the nitrate removal rate was 0.37 mmol/day when acetate was used as a sole carbon source. The acetate showed longer lag time before denitrification occurred, which implied that fumarate would have been a better carbon source compared to acetate as more amounts were utilized for nitrate removal than cell growth.</P>
어성욱(Oa Seong-Wook),안태봉(Ahn Tae-Bong),최승선(Choi Seung-Seon) 한국철도학회 2005 한국철도학회 학술발표대회논문집 Vol.- No.-
Tunnel excavation is an inevitable process for railroad construction in Korea and it being a one of the major issues of its environmental impact assessment. Ground water flow by tunnel excavation is an important parameter to determine environmental effects. The current method to determine the ground water flow is used a unit number induced a highway construction site. But it does not consider any site characteristics; ground water level, soil properties and others. The purpose of this study is to suggest the determination way of ground water flow considering site characteristics in tunnel construction.
철로 역사에서 발생 가능한 비점오염물질의 특성 및 관리방안
어성욱(Seong Wook Oa),김이형(Lee-Hyung Kim) 한국철도학회 2004 한국철도학회 학술발표대회논문집 Vol.- No.-
Nonpoint pollutants were monitored on railway station land use. Lots of pollutant mass were washed-off in a first hour. The 95% confidence interval of pollutant concentrations ranges from 61.6 to 115.4 ㎎/L for TSS(mean= 88.50 ㎎/L), 103.8~244.1 ㎎/L for COD(mean= 174 ㎎/L) and 7.68~17.32 ㎎/L for Oil & Grease(mean= 12.5 ㎎/L). The various metals were also washed-off during storm runoff from railway station. The ranges of 95% confidence intervals were 39.2~84.0 ㎍/L for total Cu(mean= 61.6 ㎍/L), 14.0~25.8 ㎍/L for total Pb(mean= 19.9 ㎍/L) and 182.2~376.1 ㎍/L for total Zn(mean= 279.2 ㎍/L). As a result of this research, we concluded that up to 50% of the total pollutant mass can be removed when first 30% of the total flow are treating, and it can be a first flush criteria for best management practices.