Hybrid Process Combining Electrocoagulation and Electro-Oxidation Processes for the Treatment of Restaurant Wastewaters
Publication: Journal of Environmental Engineering
Volume 138, Issue 11
Abstract
The present study investigates the electrocoagulation-electro-oxidation (EC-EO) process for the treatment of restaurant wastewater (RWW) loaded with organic and inorganic matter, oil, grease, and suspensions solids. The EC-EO process was evaluated in terms of its capability to simultaneously produce an oxidant and coagulant agents by using either iron or aluminum electrodes arranged in a bipolar configuration or graphite electrodes arranged in a monopolar configuration in the same electrolytic cell. Relatively high concentrations of active chlorine () and aluminum () or iron () were produced in situ. The best performance for RWW treatment was obtained by using aluminum and graphite plates alternated in the electrode pack and operated at current of 0.4 A during 90 min of treatment with pH adjusted to approximately 7.0. Under these conditions, more than 98% of oil and greases (O&G) were removed, whereas chemical oxygen demand (COD) and biological oxygen demand (BOD) removal reached 90% and 86%, respectively. Likewise, more than 88% of soluble phosphate was removed, and the process was effective in removing turbidity (98%) and suspended solids (98%). The EC-EO process operated under the best conditions involved a total cost of of treated restaurant effluent. This cost includes energy and electrode consumption, chemicals, and sludge disposal.
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Acknowledgments
Sincere thanks are extended to the National Sciences, Engineering Research Council of Canada and Premier Tech Ltée for their financial contribution to this study.
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Published In
Journal of Environmental Engineering
Volume 138 • Issue 11 • November 2012
Pages: 1146 - 1156
Copyright
© 2012 American Society of Civil Engineers.
History
Received: May 1, 2011
Accepted: Apr 9, 2012
Published online: Apr 12, 2012
Published in print: Nov 1, 2012
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