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Article

Electrochemical Processes for the Treatment of Hazardous Wastes Exemplified by Electroplating Sludge Leaching Solutions

by 1,2,3,*, 4, 1,2,3, 5, 1,2,3 and 1,2,3
1
Key Laboratory of Yellow River Water Environment in Gansu Province, Lanzhou Jiaotong University, Lanzhou 730070, China
2
School of Environment and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China
3
Engineering Research Center for Cold and Arid Regions Water Resource Comprehensive Utilization, Ministry of Education, Lanzhou 730070, China
4
Department of Environmental Science and Engineering of ZHIXING, College of Northwest Normal University, Lanzhou 730070, China
5
School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, China
*
Author to whom correspondence should be addressed.
Academic Editor: Chin-Pao Huang
Water 2021, 13(11), 1576; https://doi.org/10.3390/w13111576
Received: 7 April 2021 / Revised: 29 May 2021 / Accepted: 31 May 2021 / Published: 2 June 2021
(This article belongs to the Special Issue Advanced Electrochemical Technologies for Water Treatment)
The solidified landfill disposal of hazardous solid waste such as electroplating sludge in arid/semi-arid areas has potential risks and hazards. In this study, the electrochemical method was used to destroy the structures of metal complexes in electroplating sludge and release metal ions so that the organics were removed by direct mineralization in the anode while the metal was recovered in the cathode. A SnO2/Ti electrode was used as the anode during the electrolysis process. The effect of different current densities (10, 20, 30, 40, 50, 60 A/m2), different pH values (2, 3, 4, 5, 6), and the presence of chloride (0.1 or 0.2 M NaCl) and sulfate (0.1 or 0.2 M Na2SO4) on treatment were investigated. Under the optimal treatment conditions (current density = 50 A/m2, pH = 3), the removal rates of CODCr, TOC, and Ni2+ reached 88.01%, 85.38%, and 97.57%, respectively, with a metal recovery of 97.01%. Further studies showed that active chlorine and active persulfate generated in the presence of chloride and sulfate had less effect on the removal of organics, while hydroxyl radicals played a major role. The dilution of the leachate would be detrimental to electrochemical treatment. The by-products of organic chlorination were produced in low amounts, mainly CHCl3. This method can be used to treat electroplating sludge in various areas to recover valuable metals while removing organic pollutants, complying with the concept of sustainable development. This method provides a new solution for the treatment of metal-containing hazardous solid waste such as electroplating sludge from the perspective of practical application. View Full-Text
Keywords: arid/semi-arid areas; hazardous solid wastes; electroplating sludge; electrochemistry; environmentally friendly disposal arid/semi-arid areas; hazardous solid wastes; electroplating sludge; electrochemistry; environmentally friendly disposal
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MDPI and ACS Style

Wu, N.; Zhang, X.; Zhang, X.; Li, Y.; Song, X.; Wang, S. Electrochemical Processes for the Treatment of Hazardous Wastes Exemplified by Electroplating Sludge Leaching Solutions. Water 2021, 13, 1576. https://doi.org/10.3390/w13111576

AMA Style

Wu N, Zhang X, Zhang X, Li Y, Song X, Wang S. Electrochemical Processes for the Treatment of Hazardous Wastes Exemplified by Electroplating Sludge Leaching Solutions. Water. 2021; 13(11):1576. https://doi.org/10.3390/w13111576

Chicago/Turabian Style

Wu, Nan, Xue Zhang, Xuemin Zhang, Yanjuan Li, Xiaosan Song, and Sanfan Wang. 2021. "Electrochemical Processes for the Treatment of Hazardous Wastes Exemplified by Electroplating Sludge Leaching Solutions" Water 13, no. 11: 1576. https://doi.org/10.3390/w13111576

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