Organic Compounds and Phosphorus Removal from Dairy Wastewater by Biofilm on Iron-Containing Supports
Publication: Journal of Environmental Engineering
Volume 144, Issue 1
Abstract
This study investigated treatment of dairy wastewater in one-stage anaerobic moving biofilm reactors (AMBRs) at ambient temperature. To support biological treatment with abiotic processes (iron corrosion), metallic iron was included in the porous structure of supports. The AMBRs were operated at a hydraulic retention time of 5.5 days and organic loading rate (OLR) of 3.9 and 7.5 kgCOD (chemical oxygen demand)/(). At OLR 3.9 kg, COD removal was significantly higher with 2% iron in the support structure than without iron ( versus ). Adding Fe to the supports did not influence biogas productivity or the biogas production rate. Fe addition significantly increased phosphorus removal from about 50% in AMBRs without added Fe to with 2% iron. Further increasing Fe content to 3% did not increase COD or P removal. In all reactors, acetoclastic methanogens predominated over hydrogenotrophic methanogens; however, Fe promoted growth of Methanobacteriaceae.
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Acknowledgments
The study was conducted as part of the Strategic Programme, Innovative Systems of Technical Support for Sustainable Development of Economy, within the Innovative Economy Operational Programme. Thanks to Mark Leonard for proofreading.
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Published In
Journal of Environmental Engineering
Volume 144 • Issue 1 • January 2018
Copyright
©2017 American Society of Civil Engineers.
History
Received: Jun 27, 2016
Accepted: Jul 19, 2017
Published online: Oct 31, 2017
Published in print: Jan 1, 2018
Discussion open until: Mar 31, 2018
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