Performance of a polymerization-based electrochemically assisted persulfate process on a real coking wastewater treatment  

作　　者：Suiqin Yang Yuhong Cui Zhengqian Liu Chao Peng Shiquan Sun Jingjing Yang Mingkui Wang 

机构地区：[1]Wuhan National Laboratory for Optoelectronics,Huazhong University of Science and Technology,Wuhan 430074,China [2]School of Environmental Science and Engineering,Huazhong University of Science and Technology,Wuhan 430074,China [3]Eawag,Swiss Federal Institute of Aquatic Science and Technology,Überlandstrasse 133,Dübendorf CH-8600,Switzerland [4]School of Hydraulic Engineering,Changsha University of Science&Technology,Changsha 410114,China [5]Center for Separation and Purification Materials&Technologies,Suzhou University of Science and Technology,Suzhou 215009,China

出　　处：《Journal of Environmental Sciences》2024年第12期149-162,共14页环境科学学报（英文版）

基　　金：supported by the National Natural Sci-ence Foundation of China(No.52170078);Zheng-Qian Liu gratefully acknowledges the China Scholarship Council(No.202106165001)for financial support.

摘　　要：Industrial wastewater should be treated with caution due to its potential environmental risks.In this study,a polymerization-based cathode/Fe^(3+)/peroxydisulfate(PDS)process was employed for the first time to treat a raw coking wastewater,which can achieve simulta-neous organics abatement and recovery by converting organic contaminants into separable solid organic-polymers.The results confirm that several dominant organic contaminants in coking wastewater such as phenol,cresols,quinoline and indole can be induced to poly-merize by self-coupling or cross-coupling.The total chemical oxygen demand(COD)abate-ment from coking wastewater is 46.8%and the separable organic-polymer formed from or-ganic contaminants accounts for 62.8%of the abated COD.Dissolved organic carbon(DOC)abatement of 41.9%is achieved with about 89%less PDS consumption than conventional degradation-based process.Operating conditions such as PDS concentration,Fe3+concen-tration and current density can affect the COD/DOC abatement and organic-polymer yield by regulating the generation of reactive radicals.ESI-MS result shows that some organic-polymers are substituted by inorganic ions such as Cl^(-),Br^(-),I^(-),NH_(4)^(+),SCN^(-)and CN^(-),suggest-ing that these inorganic ionsmay be involved in the polymerization.The specific consump-tion of this coking wastewater treatment is 27 kWh/kg COD and 95 kWh/kg DOC.The values are much lower than those of the degradation-based processes in treating the same coking wastewater,and also are lower than those of most processes previously reported for coking wastewater treatment.

关 键 词：POLYMERIZATION Coking wastewater Organics recovery Advanced oxidation process Water treatment 

分 类 号：X703[环境科学与工程—环境工程]