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Electrocoagulation coupled with electrooxidation for the simultaneous treatment of multiple pollutants in contaminated sediments

查看全文 作　　者：Qingjun [1,2]Zeng;Yifan [3]Zhang;Pingshan [1,2]Chen;Yuting [1,2]He;Congli [3]Yi;Chunhua [3]Feng 高影响力作者 机构地区：[1]Fourth Harbor Engineering Institute Co.,Ltd.,China Communications Construction Co.,Ltd.,Guangzhou 510230,China;[2]Key Laboratory of Environmental Protection&Safety of Communication Foundation Engineering,China Communications Construction Co.,Ltd.,Guangzhou 510230,China;[3]The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters,Ministry of Education,School of Environment and Energy,South China University of Technology,Guangzhou 510006,China高影响力机构 出　　处：《Journal of Environmental Sciences》索引2023年第2期,共9页高影响力期刊 基　　金：supported by the National Key Research and Development Program of China (Nos. 2020YFC1808502 and2018YFC1802804);the Open Project Program of the Key Laboratory of Environmental Protection & Safety of Communication Foundation Engineering,China Communications Construction Co.,Ltd 摘　　要：In situ and simultaneous remediation of a variety of pollutants in sediments remains a challenge.In this study,we report that the combination of electrocoagulation(EC)and electrooxidation(EO)is efficient in the immobilization of phosphorus and heavymetals and in the oxidation of ammonium and toxic organicmatter.The integratedmixed metal oxide(MMO)/Fe anode system allowed the facile removal of ammonium and phosphorus in the overlying water(99% of 10 mg/L NH_(4)^(+)-N and 95% of 10 mg/L P disappeared in 15 and 30 min,respectively).Compared with the controls of the single Fe anode and single MMO anode systems,the dual MMO/Fe anode system significantly improved the removal of phenanthrene and promoted the transition of Pb and Cu from the mobile species to the immobile species.The concentrations of Pb and Cu in the toxicity characteristic leaching procedure extracts were reduced by 99%and 97% after an 8 hr operation.Further tests with four real polluted samples indicated that substantial proportions of acid-soluble fraction Pb and Cu were reduced(30%-31% for Pb and 16%–23% for Cu),and the amounts of total organic carbon and NH_(4)^(+)-N decreased by 56%–71% and 32%–63%,respectively.It was proposed that the in situ electrogenerated Fe(II)at the Fe anode and the active oxygen/chlorine species at the MMO anode are conducive to outstanding performance in the co-treatment of multiple pollutants.The results suggest that the EC/EO method is a powerful technology for the in situ remediation of sediments contaminated with different pollutants. 关 键 词：In situ sediment remediation ELECTROCOAGULATION ELECTROOXIDATION Stabilization of heavy metals Ammonia oxidation Removal of polycyclic aromatic hydrocarbons
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