Dissolved organic matter accelerates microbial degradation of 17 alpha-ethinylestradiol in the presence of iron mineral  

作　　者：Huan He Min Shi Xiaoxia Yang Juhong Zhan Yanting Lin Ziwei Guo Zhicheng Liao Chaochao Lai Xiaomin Ren Bin Huang Xuejun Pan 

机构地区：[1]Faculty of Environmental Science and Engineering,Kunming University of Science and Technology,Kunming 650500,China [2]Yunnan Provincial Key Lab of Soil Carbon Sequestration and Pollution Control,Kunming 650500,China [3]Research Institute for Environmental Innovation(Suzhou)Tsinghua,Suzhou 215163,China

出　　处：《Journal of Environmental Sciences》2024年第5期364-376,共13页环境科学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.42207450,21866017,and 42067056);the Yunnan Fundamental Research Projects(No.202101BE070001-013);the Foundation for Distinguished Young Talents of Yunnan Province(No.202101AV070006)。

摘　　要：Dissolved organic matter(DOM)and iron minerals widely existing in the natural aquatic environment can mediate the migration and transformation of organic pollutants.However,the mechanism of interaction between DOM and iron minerals in the microbial degradation of pollutants deserves further investigation.In this study,the mechanism of 17 alphaethinylestradiol(EE2)biodegradation mediated by humic acid(HA)and three kinds of iron minerals(goethite,magnetite,and pyrite)was investigated.The results found that HA and iron minerals significantly accelerated the biodegradation process of EE2,and the highest degradation efficiency of EE2(48%)was observed in the HA-mediated microbial system with pyrite under aerobic conditions.Furthermore,it had been demonstrated that hydroxyl radicals(HO·)was the main active substance responsible for the microbial degradation of EE2.HO·is primarily generated through the reaction between hydrogen peroxide secreted by microorganisms and Fe(II),with aerobic conditions being more conducive.The presence of iron minerals and HA could change the microbial communities in the EE2 biodegradation system.These findings provide new information for exploring the migration and transformation of pollutants by microorganisms in iron-rich environments.

关 键 词：Dissolved organic matter Iron mineral 17 alpha-ethinylestradiol BIODEGRADATION 

分 类 号：X172[环境科学与工程—环境科学]