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고로(高爐) 슬래그 침출수(浸出水)의 특성(特性)과 환경(環境)에 미치는 영향(影響)
최의소,권수렬,이응조,박원목,Choi, Eui So,Kwon, Soo Youl,Lee, E.C.,Park, W.M. 대한토목학회 1987 대한토목학회논문집 Vol.7 No.3
도로포장용(道路鋪裝用) 골재(骨材)로 슬래그를 사용할 때에 우수(雨水)와의 접촉에 의하여 생성되는 침출수(浸出水)에 의한 지하수(地下水)와 농작물에 대한 영향과 강재(鋼材)의 부식(腐蝕)여부를 검토하였다. 슬래그만의 침출실험결과(浸出實驗結果)와 침출수(浸出水)의 토양투과(土壤透過)에 의한 정상변화를 볼 때에 슬래그는 지하수(地下水)의 pH와 $SO_4^=$, $Ca^{{+}{+}}$, $Mg^{{+}{+}}$ 등의 농도를 높여 줄 가능성이 있는 것으로 나타났으며 pot 실험(實驗)을 통하여 볼때에 알타리무우의 생육(生育)에는 나쁜 영향을 주지 않는 것으로 나타났다. 부식촉진실험결과(腐蝕促進實驗結果)에 따르면 침출수(浸出水)와 강재(鋼材)의 접촉 초기에는 부식속도(腐蝕速度)가 매우 빠르나 $50^{\circ}C$에서 약 50 일후에는 부식정도가 일반토양(一般土壤)의 경우와 유사하게 되었다. Impacts on ground water quality, growth of crops, and degree of corrosion due to the leachate produced from the contact of rain water with blast furnace slag as an aggragate used for roadway pavement were evaluated. Results from slag and soil leaching tests indicated pH, $SO_4$, $Ca^{{+}{+}}$ and $Mg^{{+}{+}}$ concentrations of ground water could be increased due to the use of slag, and pot test suggested slag would not adversely affect growth of Raphanus Satius L niger. Accelerated corrosion test revealed that slag leachate had a tendency to increase corrosion on cast iron at the beginning, however the degree of corrosion became similar to that experienced in soil after about 50 days at 50 degrees in centigrade.
최의소 ( E So Choi ),김태훈 ( T H Kim ) 한국환경정책평가연구원 2004 환경정책연구 Vol.3 No.1
This study was conducted to estimate nitrogen discharge from Korea (southern part of Korean peninsula) as NPS(non-point source) by mass balance approach; input and output analyses of nitrogen using existing data available. The material flow was sectored into three different activities; agricultural (raising crop and animals), human and natural activities in forest and urban areas. Atmospheric deposition, biological nitrogen fixation, inorganic fertilizers and manures applied, animal feed and imported foodstuffs such as crops, meat and fish were the inputs in this study, while ammonia volatilization, denitrification, human and animal waste generation, crop and meat production, and discharge into river to ocean were the outputs. The estimated total nitrogen input was 1,194.5×103 tons N/year and the river discharge was 408 to 422×103 tons N/year, of which 66 to 71% was from NPS. In detail, the estimated NPS discharges were respectively 8,274 kg N/km2/year from agricultural area, 730 kg N/km2/year from forest and 7,657 kg N/km2/year from the other land areas such as urban and industrial area.
최의소(E . Choi),이진우(J . W . Lee),천상욱(S . O . Chun) 한국물환경학회 1998 한국물환경학회지 Vol.14 No.3
Denitrification is an essential part of biological nutrient removal process, however much studies were not conducted particularly in low temperature range. The study was conducted to establish some design data with domestic sewage by adding nitrate as electron acceptor for denitrification at temperatures of 7 to 32℃. Yield coefficients(Y-HD) were varied 0.55 to 0.21gVSS/gCOD removed with endogenous respiration rates of 0.0107 to 0.0339/d. COD requirements for NO₃N removal were increased as temperatures were lowered. Specific denitrification rates were 0.24 to 4.73gNO₃N/㎏VSS/hr.