土壤中六六六和滴滴涕的堆肥生物修复研究

Bioremediation of HCH and DDT contaminated soil by composting

采用堆肥生物修复法对土壤中六六六(HCH)和滴滴涕(DDT)的降解效果进行了研究。试验结果表明,六六六和滴滴涕的降解先后经历了快速降解阶段和缓慢降解阶段;堆肥第21天后,六六六和滴滴涕降解率均达60%以上;γ-HCH降解效果最好,其次为β-HCH,α-HCH和δ-HCH的降解效果差别较大;p,p’-DDE的降解效果要好于p,p’-DDD,初始质量浓度为0.03mg/kg的p,p’-DDT未得到降解;微生物对六六六和滴滴涕的降解作用均较明显。

Composting is an alternative bioremediation technology for treatment of organic pollutants. A preliminary study was conducted to evaluate effects on the removal of organochlorine pesticides including Hexachloroeyelohexane （HCH） and its somers, Dichloro-Diphenyl-Trichloroethane （DDT） and its derivatives by using composting technique. The results indicated that： the removal of HCH and DDT was divided into two phases;rapid and slow degradation stages more than 60% of DDT and HCH in the compost materials were removed after 21 days; the removal rate of 7-HCH was reached 100% and the following by β-HCH in both tests, and there were obvious differences of the removal rates of α-HCH and δ-HCH between the two tests; p, p＇-Dichloro-Diphenyl-Ethylene （p,p＇-DDE） removal better than p, p＇-Dichloro-Diphenyl-Dicholoethane （p,p＇-DDD）, but p, p＇-DDT, whose initial concentration was 0.03 mg/kg, had not been degraded; HCH and DDT were obvious to be degraded by composting.