초기농도가 파일럿 규모의 디젤 오염토양 콤포스팅 처리에 미치는 영향

Abstract

This study was conducted to evaluate the effect of initial concentration on pilot-scale composting of diesel-contaminated soil. Sandy soil was used in this study. Target contaminant, diesel oil, was spiked at about 10,000, 25,000, and 50,000 mg TPH/kg of dry soil. Mix ratio of soil to sludge was 1:0.5 as wet weight basis. Removal efficiencies for initial concentrations of 12,966, 23,894 and 51,042 mg TPH/kg were 90, 93 and 54%, respectively, during 33 days of composting. Normal alkanes in TPH ranged from 15 to 22% in initial soils. Volatilization of individual normal alkane in 1,999 mg n-alkanes/kg was completed within 4 days, while n-alkane compounds of C11-C14 in 5,270 and 9,836 mg n-alkanes/kg were volatilized continuously during 33 days of composing operation. The first order degradation rate constants for 12,966, 23,894, and 51,042 mg TPH/kg were 0.058, 0.076, and 0.022/day, and those for 1,997, 5,270, and 9,836 mg n-alkanes/kg were 0.093, 0.100, and 0.019/day, respectively. Considering TPH removal rate, CO2 porduction rate, and dehydrogenase activity, the concentration of 51,042 mg TPH/kg inhibited biodegradation of diesel-composting.