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Waste Manag

Title:		Effects of metal salt addition on odor and process stability during the anaerobic digestion of municipal waste sludge
Author(s):		Abbott T; Eskicioglu C;
Address:		"UBC Bioreactor Technology Group, School of Engineering, University of British Columbia Okanagan Campus, Kelowna, British Columbia V1V 1V7, Canada. Electronic address: timothy.abbott@ubc.ca. UBC Bioreactor Technology Group, School of Engineering, University of British Columbia Okanagan Campus, Kelowna, British Columbia V1V 1V7, Canada. Electronic address: cigdem.eskicioglu@ubc.ca"
Journal Title:		Waste Manag
Year:		2015
Volume:		20150808
Issue:
Page Number:		449 - 458
DOI:		10.1016/j.wasman.2015.07.050
ISSN/ISBN:		1879-2456 (Electronic) 0956-053X (Linking)
Abstract:		"Anaerobic digestion (AD) is an effective way to recover energy and nutrients from organic waste; however, several issues including the solubilization of bound nutrients and the production of corrosive, highly odorous and toxic volatile sulfur compounds (VSCs) in AD biogas can limit its wider adoption. This study explored the effects of adding two different doses of ferric chloride, aluminum sulfate and magnesium hydroxide directly to the feed of complete mix semi-continuously fed mesophilic ADs on eight of the most odorous VSCs in AD biogas at three different organic loading rates (OLR). Ferric chloride was shown to be extremely effective in reducing VSCs by up to 87%, aluminum sulfate had the opposite effect and increased VSC levels by up to 920%, while magnesium hydroxide was not shown to have any significant impact. Ferric chloride, aluminum sulfate and magnesium hydroxide were effective in reducing the concentration of orthophosphate in AD effluent although both levels of alum addition caused digester failure at elevated OLRs. Extensive foaming was observed within the magnesium hydroxide dosed digesters, particularly at higher doses and high OLRs. Certain metal salt additions may be a valuable tool in overcoming barriers to AD and to meet regulatory targets"
Keywords:		Aluminum Compounds/*chemistry Anaerobiosis Biofuels/analysis Bioreactors Iron Compounds/*chemistry Magnesium Compounds/*chemistry Odorants/*analysis Salts/chemistry Sewage/*chemistry *Waste Management Digester foaming Hydrogen sulfide Odor control Orthoph;
Notes:		"MedlineAbbott, Timothy Eskicioglu, Cigdem eng Research Support, Non-U.S. Gov't 2015/08/12 Waste Manag. 2015 Dec; 46:449-58. doi: 10.1016/j.wasman.2015.07.050. Epub 2015 Aug 8"