期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 319, 期 -, 页码 69-77出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2015.12.067
关键词
Aluminium electrodes; Chromium; Current density; Electrocoagulation; Tannery wastewater
资金
- France-Morocco cooperation
This paper deals with the ability of electrocoagulation (EC) to remove simultaneously COD and chromium from a real chrome tanning wastewater in a batch stirred electro-coagulation cell provided with two aluminium-based electrodes (aluminium/copper/magnesium alloy and pure aluminium). Effects of operating time, current density and initial concentration of Cr(III) and COD have been investigated. The concentrations of pollutants have been successfully reduced to environmentally acceptable levels even if the concentrated effluent requires a long time of treatment of around 6h with a 400 A/m(2) current density. The aluminium alloy was found to be more efficient than pure aluminium for removal of COD and chromium. Dilution of the waste has been tested for treatment: high abatement levels could be obtained with shorter time of treatment and lower current densities. Energy consumption of the electrocoagulation process was also discussed. The dilution by half of the concentrated waste leads to a higher abatement performance of both COD and chromium with the best energy efficiency. (C) 2016 Elsevier B.V. All rights reserved.
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