removal of zinc from barrel plating wash water by electro coagulation using aluminium as anode and stainless steel as cathode
S.Kalaivani,S.Ananthalakshmi
Published in International Journal of Advanced Research in Civil,Structural,Environmental and Infrastructure Engineering and Developing
ISSN: 2320-723X Impact Factor:1.7 Volume:2 Issue:2 Year: 07 July,2014 Pages:112-120
Abstract
Heavy metals are generally refractory and cannot be de-toxified and de-graded biologically, hence it is a challenging task for the industrialist and environmentalist for the safe method for the effective disposal of waste containing heavy metals. Various technique which have been developed for the removal of heavy metal include chemical precipitation, reverse osmosis, bio-sorption etc. The electro coagulation method was widely used and playing an important role in the effluent treatment. Since electro coagulation process has better removal efficiency compared to chemical coagulation. The current topic is aimed for the removal of zinc as Zn2+. The main objective to the current work is to remove zinc from barrel plating wash water by electro coagulation using aluminium (Al) as anode and stainless steel (SS) as cathode. The scheme study involves: Effect of initial metal concentration (866ppm, 433ppm, 216.5ppm, 279ppm), Effect of pH (acid, alkali, neutral), Effect of current density(0.1A, 0.2A, 0.6A), Effect of supporting electrolyte (Nacl) concentration(2gpl, 4gpl), Effect of polarity change(AL-AL, MS-MS), Effect of different combination of electrodes(AL-SS, MS-SS) for the removal of zinc. The crystallographic orientation, identification of structure were analyzed by X-ray diffraction. The presence of different phases was analyzed by XPS analysis. In order to study the surface morphology and composition of coatings SEM and EDAX were used. The reduction of zinc in wash water has been determined by FT-IR spectrometer and HPLC. In particular the electro chemical techniques provide higher efficiency than conventional methods.
Kewords
Electroplating, Electro coagulation, Zinc, Barrel Plating.
Reference
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