Document Detail


Trace element requirements for stable food waste digestion at elevated ammonia concentrations.
MedLine Citation:
PMID:  22100238     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
The work investigated why anaerobic digesters treating food waste and operating at high ammonia concentrations suffer from propionic acid accumulation which may result in process failure. The results showed deficiency of selenium, essential for both propionate oxidation and syntrophic hydrogenotrophic methanogenesis, leads to this while supplementation allows operation at substantially higher organic loading rates (OLR). At high loadings cobalt also becomes limiting, due to its role either in acetate oxidation in a reverse Wood-Ljungdahl or in hydrogenotrophic methanogenesis. Population structure analysis using fluorescent in situ hybridization showed only hydrogenotrophic methanogens. Critical Se and Co concentrations were established as 0.16 and 0.22mgkg(-1) fresh matter feed at moderate loading. At this dosage the OLR could be raised to 5gVSl(-1)day(-1) giving specific and volumetric biogas productions of 0.75m(3)kg(-1)VS(added) and 3.75STPm(3)m(-3)day(-1), representing a significant increase in process performance and operational stability.
Authors:
Charles J Banks; Yue Zhang; Ying Jiang; Sonia Heaven
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-11-2
Journal Detail:
Title:  Bioresource technology     Volume:  -     ISSN:  1873-2976     ISO Abbreviation:  -     Publication Date:  2011 Nov 
Date Detail:
Created Date:  2011-11-21     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9889523     Medline TA:  Bioresour Technol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2011. Published by Elsevier Ltd.
Affiliation:
Faculty of Engineering and the Environment, University of Southampton, Southampton SO17 1BJ, UK.
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