Recovering chromium from electroplating sludge using an integrated technology of bipolar membrane electrodialysis and H2O2 oxidation

被引：0

作者：

Lian, Rui ^{[1
]}

Liu, Yaoxing ^{[1
]}

Pan, Yan ^{[1
]}

Ding, Jianguo ^{[1
]}

Wu, Xiaoyun ^{[2
]}

Lv, Mingzhi ^{[1
]}

Wu, Xiaoyu ^{[1
]}

Chen, Riyao ^{[1
]}

Ding, Rui ^{[1
]}

Liu, Jianxi ^{[1
]}

Van der Bruggen, Bart ^{[3
,4
]}

机构：

[1] College of Environmental and Resource Sciences, College of Carbon Neutral Modern Industry, Fujian Key Laboratory of Pollution Control & Resource Reuse, Fujian Normal University, Fujian Province, Fuzhou

[2] School of Safety and Environment, Fujian Chuanzheng Communications College, Fujian Province, Fuzhou

[3] Department of Chemical Engineering, ProcESS-Process Engineering for Sustainable System, KU Leuven, Celestijnenlaan 200F, Leuven

[4] Faculty of Engineering and the Built Environment, Tshwane University of Technology, Private Bag X680, Pretoria

来源：

Chemosphere | 2024年 / 366卷

基金：

中国国家自然科学基金;

关键词：

Bipolar membrane; Chromium recovery; Electrodialysis; Electroplating sludge; Hydrogen peroxide;

D O I：

10.1016/j.chemosphere.2024.143450

中图分类号：

学科分类号：

摘要：

Chromium electroplating produces Cr(III)-containing electroplating sludge (EPS) in large volumes, which is easily oxidised to Cr(Ⅵ) and is harmful to the environment and human health. This study recovered Cr(III) as Na2CrO4 from EPS using an integrated bipolar membrane electrodialysis (BMED)–H2O2 oxidation technology. During the treatment process, Cr(III) was oxidised to Cr(VI) using H2O2 in an alkaline environment, BMED was used to separate and recover Cr(VI). Experimental results showed that H2O2 dosage and pH affected Cr(III) oxidation—the highest Cr(III) oxidation ratio of 68.4% was observed when H2O2 dosage and pH were 5.5 mL and 12.0, respectively. The current density, solid/liquid ratio and sludge particle size affected Cr(III) recovery, energy consumption and current efficiency. Under a current density of 20.0 mA/cm2, solid/liquid ratio of 1.0:45 and sludge particle size of 100 mesh, 58.2% of Cr(III) was recovered. When the number of the equipped EPS compartments was increased from one to two and three, the specific energy consumption decreased from 1.04 to 0.87 and 0.81 kW h/g, respectively, but the current efficiency remained almost constant. After EPS treatment, the Cr(III) remaining in the sludge was mainly in the residual state, which is less environmentally harmful. The obtained Na2CrO4 had similar properties according to X-ray diffraction analysis. Thus, the proposed integrated technology effectively recovers Cr(III) from EPS and other chromium-containing solid wastes. © 2024 Elsevier Ltd

引用

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