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| Enhanced microbial remediation of dichlorodiphenyltrichloroethane(DDT)-contaminated farmland soil |
| Received:June 20, 2017 |
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| KeyWord:DDTs;mixed bacteria;anionic-nonionic mixed surfactant;blood meal |
| Author Name | Affiliation | E-mail | | WANG Xiao-xu | Key Laboratory of Regional Environment and Eco-Remediation, Ministry of Education, Shenyang University, Shenyang 110044, China | | | SUN Li-na | Key Laboratory of Regional Environment and Eco-Remediation, Ministry of Education, Shenyang University, Shenyang 110044, China | Sln629@163.com | | ZHENG Xue-hao | Key Laboratory of Regional Environment and Eco-Remediation, Ministry of Education, Shenyang University, Shenyang 110044, China | | | WU Hao | Key Laboratory of Regional Environment and Eco-Remediation, Ministry of Education, Shenyang University, Shenyang 110044, China | | | WANG Hui | Key Laboratory of Regional Environment and Eco-Remediation, Ministry of Education, Shenyang University, Shenyang 110044, China | | | LIU Chun-yue | Key Laboratory of Regional Environment and Eco-Remediation, Ministry of Education, Shenyang University, Shenyang 110044, China | |
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| Abstract: |
| In order to improve the microbial remediation efficiency of dichlorodiphenyltrichloroethane(DDT)-contaminated soil, field-scale bioremediation of farmland soil contaminated by DDTs from the Shenyang North New Area of China was performed using mixed bacteria(Arthrobacter globiformis and Bacillus methylotrophicus). Enhanced mixed-bacteria remediation was investigated in the presence of blood meal(3X) and SDBS-Tween 80-mixed surfactants(3H). The changes in DDT isomers/primary metabolites during the remediation process were analyzed. The results showed that the inoculation of mixed bacteria could effectively reduce the residual DDTs in soil and the effect of three fold inoculation(3PN-1) was better than single inoculation(PN-1). After 90 days, the degradation rate of DDTs reached 50.5%, which was 45.9% higher than that of the control group. The residual DDTs in soil could be significantly reduced by adding blood meal and surfactants. Among the treatments, that of SDBS-Tween 80 combined with mixed bacteria was the best. The highest degradation rate of DDTs was 63.2%, which was 12.8% higher than that of the treatment of using mixed bacteria alone. The analysis result of the DDT isomers/primary metabolites indicated that remediation with SDBS-Tween 80 combined with mixed bacteria has a high degradation of 62.4% for p,p'-DDE, which has strong ecotoxicity, thus the ecological risk after remediation was effectively reduced. Therefore, SDBS-Tween 80-enhanced mixed-bacteria treatment has potential application for microbial remediation of DDT-contaminated soil. |
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