Electrolysis-enhanced co-digestion of switchgrass and cow manure

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DOIResolve DOI: http://doi.org/10.1002/jctb.4224
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TypeArticle
Journal titleJournal of Chemical Technology and Biotechnology
ISSN0268-2575
Volume89
Issue10
Pages15011506; # of pages: 6
SubjectCo-digestion; Cow manure; Micro aerobics; Switchgrass; Water electrolysis; Anaerobic digestion; Panicum virgatum
AbstractBACKGROUND: Anaerobic digestion of agricultural wastes is a cost effective way for combining resource recovery and methane production. This paper evaluates the co-digestion of cow manure and switchgrass in a completely stirred tank reactor (CSTR) by the electrolysis-enhanced anaerobic digestion (eAD) process. RESULTS: The electrodes for water electrolysis were installed directly in an anaerobic digester and were used to create micro-aerobic conditions. Significant gains in process performance and biogas quality were obtained at current densities of 20-25 mA LR-1 (per digester volume) with a corresponding volumetric energy consumption of 0.07-0.08 Wh LR-1. In particular, the COD removal rate was increased from 0.6 to 0.9 g COD LR-1 d-1, methane production increased by 26%, and H2S content in the biogas declined from 2500-3000 ppm to less than 10 ppm. CONCLUSIONS: The improved performance was achieved due to methane production from hydrolytic H2 and possibly due to the enhanced hydrolysis of organic matter.
Publication date
PublisherWiley
LanguageEnglish
AffiliationNational Research Council Canada; Energy, Mining and Environment; Business Management Support; NRC Biotechnology Research Institute
Peer reviewedYes
NPARC number21275489
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Record identifier5299d9ab-c55b-48cb-b099-85b5abe8fbf6
Record created2015-07-14
Record modified2016-05-09
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