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조기철(Ki-Chul Cho),신은상,황경철,조일형(Il-Hyoung Cho),이내현(Nae-Hyun Lee),여현구(Hyun-Gu Yeo),Byeung-Ik Ko 대한환경위생공학회 2006 대한환경위생공학회지 Vol.21 No.3
As traffic in city-centre around the world continues to increase, so levels of atmospheric pollutants continue to rise. High concentrations of NOx can have negative effects on human health, and we must find new ways to reduce their levels in the air we breathe. Nitrogen oxide gas (NOx), consisting of nitrogen monoxide (NO) and nitrogen dioxide (NO₂) produced using O₃ oxidation, at a low concentration corresponding to that on roads as a result of exhaust from automobiles, was carried out to evaluate the removal characteristics of NOx through a laboratory-scale biofilter packed with soil as a packing material. A mixture media (yellow soil (30%): soil (40%): compost (10%): a used briquet (20%)) was applied. After about 1day of operation, the removal efficiency for NO₂ in all experiments with a constant condition (25℃ and water humidity (60%)) was over 98%. The retention times of the section between phase Ⅰ and phase Ⅱ for formation and reduction of O₃, NO and NO₂ on the initial O₃ concentration was 50min (O₃:195 ppb), 55min (O₃:925 ppb), 65min (O₃:1743 ppb), 70min (O₃:2616 ppb), 75min (O₃:3500 ppb), respectively. The soil biofilter system is a unique technology that purifies urban air by utilizing the natural processes that take place in the soil. Although some of the processes are quite complex, they can broadly be summarized as adsorption onto soil particles, dissolution into soil pore water, and biochemical.
MTBE(Methyl Tertiary Butyl Ether)의 토양내 이동특성에 관한 연구
조기철(Ki Chul Cho),박창웅(Chang Woong Park),최원준(Won Joon Choi),강승엽(Seung Yub Kang),황종현(Jong Hyun Hwang),김윤수(Youn Soo Kim),오광중(Kwang Joong Oh) 大韓環境工學會 2008 대한환경공학회지 Vol.30 No.2
본 연구에서는 주유소 등의 지하 유류저장탱크나 파이프의 제한된 수명으로 인해 발생할 수 있는 가솔린의 누출에 의해 MTBE로 토양이 오염되었을 경우를 가정하여, 칼럼실험을 수행하고, CXTFIT 기법을 이용하여 토양 내 MTBE의 이동특성을 살펴보았다. 칼럼실험에서는 토성, 수분함량, 유기물함량, 주입유속을 달리하여, 주입액과 유출액의 MTBE의 농도 측정값을 비교하고, CXTFIT기법을 이용하여 two-site 비평형 흡착모델에 사용된 매개변수(D, R, b, w)를 구하였다. 이들 매개변수와 파과곡선을 이용하여 MTBE의 토양 내 이동특성을 살펴보았다. 토양 내 미세입자와 유기물함량이 많을수록 이류에 의한 영향이 감소하는 것으로 나타났으며, 수분함량과 유속의 증가는 이류에 의한 MTBE의 이동을 더욱 가속시키는 것으로 나타났다. In this stduy, the column experiments were carried out assuming the soil was contaminated by leakage of gasoline containing MTBE from USTs and pipes around gas stations. Then, characteristics of MTBE transport in the soil were investigated using CXTFIT program. The column experiments with different soil properties, moisture content, organic matter content and flow rate were carried out. Some parameters(D, R, b, w) used in two-site non-equilibrium adsorption model were obtained from measuring the MTBE concentration in injection-liquid and in effluent and using CXTFIT program. In addition, The characteristics of MTBE transport in the soil was found using BTCs and obtained parameters. Consequently, the advection decreased as the increase of the content of fine particle and organic, while the MTBE transport by advection was enhanced as increasing flow rate and moisture content.