Journal
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
Volume 4, Issue 4, Pages 4001-4011Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jece.2016.09.002
Keywords
Electrocoagulation process; Kinetics of dye removal; Crystal violet; Mechanism of the flocs formation; Simulation of electrocoagulation
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Funding
- Ministry of National Education and Research of the Republic of Senegal
- Paul Sabatier University (UT III Toulouse)
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The removal crystal violet (CV) from wastewater solutions was performed by electrocoagulation process based on an aluminum sacrificial anode. The effect of the operating parameters was experimentally investigated; a complete removal was achieved after 1 h electrolyses, and various 'short times' electrolyses were carried out to fundamentally investigate the main physical phenomena conditioning the flocs formation and allowing to achieve satisfactory coagulation rates. A simplified theoretical model was proposed to predict the dye removal rate and to design an electrochemical reactor. It is based on a mechanism, involving Al(OH)(3) oligomers formation, and competition between electrochemical oxidation and coagulation rate. The good agreement between simulation and experiments, allows i) the required kinetic constant value to be determined and ii) the limiting step to be defined as a reaction involving one Al(OH)(3) fixating 4 molecules of the crystal violet. The presented results may be easily extrapolated to other dyes removal. (C) 2016 Elsevier Ltd. All rights reserved.
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