Three-Stage Biological System for Treatment of Coke Oven Effluent
Publication: Journal of Hazardous, Toxic, and Radioactive Waste
Volume 22, Issue 3
Abstract
A three-stage continuous biological treatment system has been developed for removal of cyanide, phenol, organics, and ammonia from a coke oven effluent. Two stages of activated sludge treatment with completely mixed aeration tanks followed by a hybrid anoxic reactor, in series, were used. The hybrid anoxic reactor uses self-immobilized microbial biomass (granular sludge) under fluidized conditions. A pilot plant was evaluated for a period of over 6 months to monitor organics, ammonia, phenol, and cyanide removal. The activated sludge treatment systems were operated at a hydraulic retention time of 1 day and the hybrid reactor at 16 h. Major constituents of the effluent used in the study were cyanide (), phenol (), ammoniacal nitrogen (), organic load [400–1,500 mg chemical oxygen demand ], and nitrate nitrogen (). Removal efficiencies were around 90% for organic load, 88% for ammoniacal nitrogen, 100% for nitrate nitrogen, and almost 99 and 100% for cyanide and phenol, respectively. The process is presently being scaled up to 1,000 L per day.
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©2018 American Society of Civil Engineers.
History
Received: Apr 11, 2016
Accepted: Oct 25, 2017
Published online: Apr 25, 2018
Published in print: Jul 1, 2018
Discussion open until: Sep 25, 2018
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