Differing Effects of Glycerin on Anaerobic Co-digestion of Mixed Substrates in Bench-Scale Assays and Sub Pilot-Scale Reactors

dc.contributor.author Sell, Steven
dc.contributor.author Raman, D. Raj
dc.contributor.author Raman, D.
dc.contributor.author Burns, Robert
dc.contributor.author Anex, Robert
dc.contributor.department Agricultural and Biosystems Engineering
dc.date 2018-02-13T03:44:35.000
dc.date.accessioned 2020-06-29T22:35:07Z
dc.date.available 2020-06-29T22:35:07Z
dc.date.copyright Sat Jan 01 00:00:00 UTC 2011
dc.date.embargo 2012-12-07
dc.date.issued 2011-08-01
dc.description.abstract <p>Bench-scale methods such as Biochemical Methane Potential (BMP) assays and Anaerobic Toxicity Assays (ATAs) are useful tools in evaluating potential feedstocks for anaerobic digestion. The BMP method provides a preliminary indication of substrate biodegradability and methane production, while the ATAs provide an indication of substrate toxicity to anaerobic microbial consortia. Previous research using small (<20 >L) reactors indicated that co-digestion of manures with small amounts of glycerin (ca. 1 – 2 %) can double methane production, but toxicity can result if glycerin exceeds 2% (volumetric basis). This paper investigated the relationship between bench-scale methods (BMPs and ATAs) and sub pilot-scale digester results, using glycerin as a test substrate mixed with a baseline feedstock (beef manure, corn processing wastewater, lagoon liquid, and short-fiber cardboard). The batch-fed, stirred ATAs indicated that glycerin was toxic to methane production at all inclusion levels. The batch-fed, stirred BMPs indicated no significant difference between methane production in the 0.0%to 4.0% addition levels; however at 8.0% addition, methane production tripled. The continuously fed, non-stirred, plug-flow sub pilot-scale reactors indicated toxicity effects in the 2.0% and 4.0% glycerin mixtures and no difference from the control in the 1.0% glycerin mixture. These results demonstrate the variations in scale performance of glycerin as a co-substrate and identify some serious challenges in extrapolating bench-scale assays to large-scale performance of mixed-waste anaerobic digestion systems.</p>
dc.description.comments <p>This is an ASABE Meeting Presentation, Paper No. <a href="http://elibrary.asabe.org/abstract.asp?aid=38512&t=3&dabs=Y&redir=&redirType=" target="_blank">1111519</a>.</p>
dc.identifier archive/lib.dr.iastate.edu/abe_eng_conf/53/
dc.identifier.articleid 1052
dc.identifier.contextkey 3522294
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath abe_eng_conf/53
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/571
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/abe_eng_conf/53/Raman_2011_DifferingEffectsGlycerin.pdf|||Sat Jan 15 00:49:28 UTC 2022
dc.source.uri 10.13031/2013.38512
dc.subject.disciplines Bioresource and Agricultural Engineering
dc.subject.keywords Anaerobic Digestion
dc.subject.keywords Biochemical Methane Potential (BMP)
dc.subject.keywords Anaerobic Toxicity Assays (ATAs)
dc.subject.keywords Glycerin
dc.subject.keywords Co-digestion
dc.title Differing Effects of Glycerin on Anaerobic Co-digestion of Mixed Substrates in Bench-Scale Assays and Sub Pilot-Scale Reactors
dc.type article
dc.type.genre conference
dspace.entity.type Publication
relation.isAuthorOfPublication 0d20027b-c384-4033-aafe-d7cf62e10240
relation.isOrgUnitOfPublication 8eb24241-0d92-4baf-ae75-08f716d30801
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