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Chemosphere

Title:		Electrochemical treatment for leachate membrane retentate: Performance comparison of electrochemical oxidation and electro-coagulation technology
Author(s):		Song K; Ren X; Zhang Q; Xu L; Liu D;
Address:		"Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, NO.111, North Section 1, 2nd Ring Road, Chengdu, 610031, China; Sichuan Provincial Engineering Research Center of City Solid Waste Energy and Buliding Materials Conversion and Utilization Technology, Chengdu University, Chengdu, NO. 2025, Chengluo Road, Chengdu, 610106, China. Sichuan Provincial Engineering Research Center of City Solid Waste Energy and Buliding Materials Conversion and Utilization Technology, Chengdu University, Chengdu, NO. 2025, Chengluo Road, Chengdu, 610106, China; Postdoctoral Research Station of Haitian Water Group CO., Ltd, AVIC International Exchange Center, North Section of Yizhou Avenue, Chengdu, 610041, China. Electronic address: renxu@my.swjtu.edu.com. Sichuan Provincial Engineering Research Center of City Solid Waste Energy and Buliding Materials Conversion and Utilization Technology, Chengdu University, Chengdu, NO. 2025, Chengluo Road, Chengdu, 610106, China. Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, NO.111, North Section 1, 2nd Ring Road, Chengdu, 610031, China"
Journal Title:		Chemosphere
Year:		2022
Volume:		20220521
Issue:		Pt 2
Page Number:		134986 -
DOI:		10.1016/j.chemosphere.2022.134986
ISSN/ISBN:		1879-1298 (Electronic) 0045-6535 (Linking)
Abstract:		"With the widespread use of membrane in advanced treatment of leachate, China produces a large amount of leachate membrane retentate (LMR) ( approximately 23.4 million tons) annually, which is usually treated by incineration or recirculation in engineering, but these technologies have many drawbacks. LMR is suitable for electrochemical treatment due to its high electrical conductivity. This study compared the performances of electrochemical oxidation (EO) and electro-coagulation (EC) technology on LMR treatment under different experimental conditions, including anode material, current density, initial pH and reaction time. We found that EO optimal conditions achieved 70.1%, 83.1%, 78.7%, 98.7%, and 69.7% removal of total organic carbon (TOC), UV absorption (at 254 nm), chromaticity, ammonia nitrogen (NH(3)-N), and total nitrogen (TN), respectively. Compared with EO, EC exhibited a similar removal ability for orgainics and better removals of chroma, but much less performance for removing nitrogen pollutants in the same reaction time, that is, removals of NH(3)-N and TN were only 31.5% and 36.2%, respectively. Meanwhile, EC showed much higher instantaneous current efficiency of COD than EO under its optimal reaction time (120 min). In addition, the UV-Vis spectra and 3D fluorescence spectra indicated that EO exhibited relatively outstanding performance in decomposing dissolved organic matter (DOM) with rather complicated structures than EC. Also, the flow field-flow fractionation technique demonstrated that EO preferentially destroy humic-like, large molecular weight DOM, and converting them to smaller molecules, which resulted in more volatile organic compounds in EO samples than EC samples. While EC had little selectivity in the removal of organics, except humic-like DOM with relative small molecular. These findings can provide a theoretical basis for the electrochemical treatment of LMR"
Keywords:		"Nitrogen Oxidation-Reduction Technology *Waste Disposal, Fluid/methods *Water Pollutants, Chemical/analysis Advanced oxidation Electro-coagulation Eletrochemical oxidation Leachate membrane retentate Performance;"
Notes:		"MedlineSong, Kai Ren, Xu Zhang, Qiaoyun Xu, Linghan Liu, Dan eng England 2022/05/25 Chemosphere. 2022 Sep; 303(Pt 2):134986. doi: 10.1016/j.chemosphere.2022.134986. Epub 2022 May 21"