Sulfide Production Control in UASB Reactor by Addition of Iron Salt
Publication: Journal of Environmental Engineering
Volume 141, Issue 6
Abstract
Hydrogen sulfide () is one of the main odorant gases emitted from anaerobic sludge blanket (UASB) sewage treatment plants (STPs) and other anaerobic environments. The present work is an attempt to quantify formation in seven full-scale UASB reactors across India and suppression of sulfide formation using pilot-scale UASB reactors and adopting a liquid-phase odor and corrosion control method that enhances sulfate () concentration in raw sewage up to . Results for full-scale UASBs reveal that varies 0–20.3 ppm because of high influent sulfates that range as the result of ingress of industrial wastewater in domestic sewage. However, results for the pilot-scale UASBs reveal that in the influent () converted to sulfide () at ORP and pH to the safe range (; ). After sulfate enhancement, sulfide was observed to be ; COD removal, 80–85%; and ORP ranging from to . Furthermore, iron salt (), which was added at (a ratio to sulfide concentration) minimized sulfide in the reactor up to 99%.
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Published In
Journal of Environmental Engineering
Volume 141 • Issue 6 • June 2015
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Jul 18, 2013
Accepted: Sep 16, 2014
Published online: Nov 13, 2014
Discussion open until: Apr 13, 2015
Published in print: Jun 1, 2015
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