Application of sewage sludge and intermittent aeration strategy to the bioremediation of DDT- and HCH-contaminated soil  

作　　者：Qi Liang Mei Lei Tongbin Chen Jun Yang Xiaoming Wan Sucai Yang 

机构地区：[1]Institute of Geographic Sciences and Natural Resources Research,Chinese Academy of Sciences

出　　处：《Journal of Environmental Sciences》2014年第8期1673-1680,共8页环境科学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China (No.41271478,41101463,and 41271479);the Special Fund for Scientific Research of China's Ministry of Land and Resources in the Public Interest (No.201111020)

摘　　要：Adding organic amendments to stimulate the biodegradation of pesticides is a subject of ongoing interest. The effect of sewage sludge on the bioremediation of dichlorodiphenyltrichloroethane（DDT） and hexachlorocyclohexane（HCH） contaminated soil was investigated in bench scale experiments,and intermittent aeration strategy was also used in this study to form an anaerobic–aerobic cycle. Bioremediation of DDT and HCH was enhanced with the addition of sewage sludge and the intermittent aeration. The removal rates of HCH and DDT were raised by 16.8%–80.8% in 10 days. Sewage sludge increased the organic carbon content from 6.2 to218 g/kg,and it could also introduce efficient degradation microbes to soil,including Pseudomonas sp.,Bacillus sp. and Sphingomonas sp. The unaerated phase enhanced the anaerobic dechlorination of DDT and HCH,and anaerobic removal rates of β-HCH,o,p′-DDT and p,p′-DDT accounted for more than 50% of the total removal rates,but the content of α-HCH declined more in the aerobic phase.Adding organic amendments to stimulate the biodegradation of pesticides is a subject of ongoing interest. The effect of sewage sludge on the bioremediation of dichlorodiphenyltrichloroethane（DDT） and hexachlorocyclohexane（HCH） contaminated soil was investigated in bench scale experiments,and intermittent aeration strategy was also used in this study to form an anaerobic–aerobic cycle. Bioremediation of DDT and HCH was enhanced with the addition of sewage sludge and the intermittent aeration. The removal rates of HCH and DDT were raised by 16.8%–80.8% in 10 days. Sewage sludge increased the organic carbon content from 6.2 to218 g/kg,and it could also introduce efficient degradation microbes to soil,including Pseudomonas sp.,Bacillus sp. and Sphingomonas sp. The unaerated phase enhanced the anaerobic dechlorination of DDT and HCH,and anaerobic removal rates of β-HCH,o,p′-DDT and p,p′-DDT accounted for more than 50% of the total removal rates,but the content of α-HCH declined more in the aerobic phase.

关 键 词：BIOREMEDIATION Dichlorodiphenyltrichloroethane（DDT） Hexachlorocyclohexane（HCH） Sewage sludge Aeration strategy 

分 类 号：X53[环境科学与工程—环境工程] X592