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Microbial degradation of endosulfan in contaminated soil with the elution of surfactants

文献类型： 外文期刊

作者： Deng, Fei 1 ; Xiong, Bailian 1 ; Chen, Benshou 3 ; Zheng, Guocan 4 ; Zhang, Jinzhong 1 ;

作者机构： 1.Southwest Univ, Coll Resources & Environm, Key Lab Ecoenvironm Three Gorges Reservoir Reg, Minist Educ, Chongqing 400715, Peoples R China

2.Zunyi Normal Coll, Dept Resources & Environm, Zunyi 563002, Guizhou, Peoples R China

3.Chongqing Chem Engn Vocat Coll, Chongqing 400020, Peoples R China

4.Chongqing Entry Exit Inspect & Quarantine Bur, Chongqing 400020, Peoples R China

5.Chongqing Key Lab Agr Resources & Environm, Chongqing 400716, Peoples R China

关键词： Endosulfan;Microbial degradation;Soil;Surfactant;Elution

期刊名称：ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH （ 影响因子：4.223； 五年影响因子：4.306 ）

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收录情况： SCI

摘要： In this work, an endosulfan-degrading strain was isolated from the aged soil contaminated by endosulfan, and identified as Ochrobactrum sp. EB-4 by 16S rDNA sequence analysis. The microbial degradation characteristics of endosulfan in three eluents (Tween 80 + SDS, Tween 80 + Na2SiO3, Tween 80 + SDS + Na2SiO3) were investigated. The results showed that the degradation percents of alpha-, beta-endosulfan in the three eluents were 86.83 %similar to 92.91 % and 88.90 %similar to 93.94 % in 15 days, respectively. The degradation process can be well described by the first-order kinetic model, and the half-times of alpha-endosulfan in eluent 1 similar to eluent 3 were 3.83, 5.29, and 4.53 days, while those of beta-endosulfan were 3.35, 4.50 and 3.79 days, respectively. The endosulfan diol and endosulfan sulfate as main metabolites were detected, and the former can be further degraded by this strain, which revealed that the simultaneously happened hydrolysis and oxidation reactions were the main degradation processes, and dominated by hydrolysis reaction. After 5 days of washing with the eluents, 56.00 similar to 84.33 % of alpha-endosulfan, and 46.49 similar to 68.56 % of beta-endosulfan in soil were eluted, respectively, and can be entirely biodegraded in 12 days, which indicated that the microbial degradation was the rate-determining step.

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