生态环境学报2017，Vol.26Issue(3)：486-492,7.DOI:10.16258/j.cnki.1674-5906.2017.03.018
表面活性剂强化微生物修复DDTs-PAHs复合污染农田土壤影响研究
Enhanced Effects of Surfactants on the Bioremediation of DDTs-PAHs in Co-contaminated Farmland Soil
摘要
Abstract
Dichlorodiphenyltrichloroethanes (DDTs) and polycyclic aromatic hydrocarbons (PAHs) are typical persistent organic pollutants (POPs) in soils,which has environmental toxicity and caused negative impacts on organisms.The enhanced effects of anionic-nonionic mixed surfactant [sodium dodecyl benzene sulfonate (SDBS) and polyoxyethylene (80) sorbitan monolaurate (Tween 80),the mixture mass ratio of 2:3] and biosurfactant rhamnolipids (RL) on the bioremediation of DDTs-PAHs with mixed bacteria [Arthrobacter globiformis and Bacillus methylotrophicus,the mixture volume ratio of 2:1] in co-contaminated farmland soil were investigated based on a field survey,The results showed that SDBS-Tween80 and RL could enhance the degradation rates of DDTs and PAHs when bioremediated with mixed bacteria.In the SDBS-Tween80-enhanced mixed bacteria treatments,when the applied concentration of SDBS-Tween80 was 100 mg·kg-1,the highest degradation rates of DDTs and PAHs were up to 57.8％ and 35.6％ within 150 d,and which were 14.9％ and 11.9％ higher than that of the mixed bacteria treatment alone.In the RL-enhanced mixed bacteria treatments,when the addition concentration of RL was 5 mg·kg-1,the highest degradation rates of DDTs and PAHs were up to 50.3％ and 28.6％ within 150 d,and which were 7.4％ and 4.9％ higher than that of the mixed bacteria treatment alone.Therefore,the optimum concentration of SDBS-Tween80 for biodegradation of DDTs-PAHs in co-contaminated farmland soil was approximately 8％ higher than that of RL,and the bioremediation was more cost-effective for SDBS-Tween80.Meanwhile,at the best optimum concentration of SDBS-Tween80 was 100 mg·kg-1,the corresponding degradation rates of p,p'-DDE and high-rings PAHs were significantly increased,and up to 63.0％ and 30.6％ respectively,which were 18.8％ and 12.7％ higher than that of the mixed bacteria treatment alone.This method has prospective application in the field of remediation of co-contaminated soils.关键词
DDTs/PAHs/表面活性剂/混合菌/复合污染Key words
DDTs/PAHs/surfactants/mixed bacteria/co-contaminated分类
资源环境引用本文复制引用
王晓旭,孙丽娜,郑学昊,吴昊,王辉,陈苏,李化超..表面活性剂强化微生物修复DDTs-PAHs复合污染农田土壤影响研究[J].生态环境学报,2017,26(3):486-492,7.基金项目
国家重点基础研究发展计划项目(973计划)(2014CB441106) （973计划）
中华环境保护基金会格平绿色行动辽宁环境科研教育“123”工程项目(CEPF2013-123-1-7) （CEPF2013-123-1-7）
沈阳市科学事业费竞争性选择项目(城市生态环境风险管理及其修复技术研究) （城市生态环境风险管理及其修复技术研究）
沈阳市科技计划项目(F14-133-9-00) （F14-133-9-00）
中国1∶5万土壤图籍编撰及高精度数字土壤构建(二期工程)项目(2012FY112100) （二期工程）
