Addition of Metal Salts to Reduce Odor Causing Volatile Sulfur Compounds and Pathogens from the Anaerobic Digestion of Municipal Waste Sludge
Anaerobic digestion (AD) is an effective way to recover energy and nutrients from organic waste; however issues like odor and pathogens in the remaining biosolids can limit its wider adoption. A full-factorial study explored the effects of adding two different doses of ferric chloride
(FC), aluminum sulfate (AL) and magnesium hydroxide (Mg) directly to the feed of mesophilic ADs on eight of the most odorous volatile sulfur compounds (VSCs) commonly found in biogas and pathogens in the biosolids.
FC was shown to be extremely effective in reducing VSCs by up to 86% while it only had a modest effect in reducing pathogens in the biosolids. AL increased VSC levels by up to 850%; however it was very effective in reducing pathogens. Mg was shown to be somewhat effective in reducing odor but is contraindicated for pathogen removal.
FC was shown to be extremely effective in reducing VSCs by up to 86% while it only had a modest effect in reducing pathogens in the biosolids. AL increased VSC levels by up to 850%; however it was very effective in reducing pathogens. Mg was shown to be somewhat effective in reducing odor but is contraindicated for pathogen removal.
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Document Type: Research Article
Publication date: 01 October 2014
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