Escherichia coli inactivation kinetics in anaerobic digestion of dairy manure under moderate, mesophilic and thermophilic temperatures

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dc.contributor.author Pandey, Pramod
dc.contributor.author Soupir, Michelle
dc.contributor.author Soupir, Michelle
dc.contributor.department Agricultural and Biosystems Engineering
dc.date 2018-02-13T04:43:46.000
dc.date.accessioned 2020-06-29T22:38:16Z
dc.date.available 2020-06-29T22:38:16Z
dc.date.copyright Sat Jan 01 00:00:00 UTC 2011
dc.date.embargo 2013-01-08
dc.date.issued 2011-01-01
dc.description.abstract <p>Batch anaerobic digestion experiments using dairy manure as feedstocks were performed at moderate (25°C), mesophilic (37°C), and thermophilic (52.5°C) temperatures to understand E. coli, an indicator organism for pathogens, inactivation in dairy manure. Incubation periods at 25, 37, and 52.5°C, were 61, 41, and 28 days respectively. Results were used to develop models for predicting E. coli inactivation and survival in anaerobic digestion. For modeling we used the decay of E. coli at each temperature to calculate the first-order inactivation rate coefficients, and these rates were used to formulate the time - temperature - E. coli survival relationships. We found the inactivation rate coefficient at 52.5°C was 17 and 15 times larger than the inactivation rate coefficients at 25 and 37°C, respectively. Decimal reduction times (D10 ; time to achieve one log removal) at 25, 37, and 52.5°C, were 9 -10, 7 - 8 days, and < 1 day, respectively. The Arrhenius correlation between inactivation rate coefficients and temperatures over the range 25 -52.5°C was developed to understand the impacts of temperature on E. coli inactivation rate. Using this correlation, the time - temperature - E. coli survival relationships were derived. Besides E. coli inactivation, impacts of temperature on biogas production, methane content, pH change, ORP, and solid reduction were also studied. At higher temperatures, biogas production and methane content was greater than that at low temperatures. While at thermophilic temperature pH was increased, at mesophilic and moderate temperatures pH were reduced over the incubation period. These results can be used to understand pathogen inactivation during anaerobic digestion of dairy manure, and impacts of temperatures on performance of anaerobic digesters treating dairy manure.</p>
dc.description.comments <p>This article is from <em>AMB Express </em>1, no. 18 (2011), doi:<a href="http://dx.doi.org/10.1186/2191-0855-1-18" target="_blank">10.1186/2191-0855-1-18</a>.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/abe_eng_pubs/245/
dc.identifier.articleid 1243
dc.identifier.contextkey 3568126
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath abe_eng_pubs/245
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/991
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/abe_eng_pubs/245/Soupir_2011_EscherichiacoliInactivation.pdf|||Fri Jan 14 22:53:51 UTC 2022
dc.source.uri 10.1186/2191-0855-1-18
dc.subject.disciplines Agriculture
dc.subject.disciplines Bioresource and Agricultural Engineering
dc.subject.keywords E. coli
dc.subject.keywords inactivation kinetic
dc.subject.keywords dairy manure
dc.subject.keywords anaerobic digestion
dc.subject.keywords temperature
dc.title Escherichia coli inactivation kinetics in anaerobic digestion of dairy manure under moderate, mesophilic and thermophilic temperatures
dc.type article
dc.type.genre article
dspace.entity.type Publication
relation.isAuthorOfPublication 04becbfb-7a97-4d96-a0dd-5514295530ee
relation.isOrgUnitOfPublication 8eb24241-0d92-4baf-ae75-08f716d30801
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