Anaerobic co-digestion of dairy manure with mulched switchgrass for improvement of the methane yield

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DOIResolve DOI: http://doi.org/10.1007/s00449-011-0572-5
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TypeArticle
Journal titleBioprocess and Biosystems Engineering
Volume35
Issue3
Pages341349; # of pages: 9
SubjectAnaerobic digestion; Switchgrass; Panicum vergatum; Digester; Methane
AbstractThe owners of farm-scale anaerobic digesters are relying on off-farm wastes or energy crops as a co-digestion feedstock with animal manure in order to increase their production of methane and thus revenues. Switchgrass represents an interesting feedstock for Canadian digesters owners as it is a high-yielding low-maintenance perennial crop, well adapted to northern climate. Methane potential assays in batch tests showed methane production of 19.4 ± 3.6, 28.3 ± 1.7, 37.3 ± 7.1 and 45.7 ± 0.8 L kg -1, for raw manure, blended manure, manure and mulched switchgrass, manure and pretreated switchgrass, respectively. Two 6-L lab-scale anaerobic digesters were operated for 130 days in order to assess the benefit of co-digesting switchgrass with bovine manure (digester #2), at a 20% wet mass fraction, compared with a manure-only operation (digester #1) The digesters were operated at an hydraulic retention time of 37 ± 6 days and at loads of 2.4 ± 0.6 and 2.6 ± 0.6 kg total volatile solids (TVS) L⁻¹ day⁻¹ for digesters #1 (D1) and #2 (D2), respectively. The TVS degradation reached 25 and 39%, which resulted in a methane production of 1.18 ± 0.18 and 2.19 ± 0.31 L day⁻¹ for D1 and D2, respectively. The addition of 20% on a wet mass ratio of switchgrass to a manure digester increased its methane production by 86%. The co-digestion of switchgrass in a 500 m³ manure digester could yield up to 10.2 GJ day⁻¹ of purified methane or 1.1 MWh day⁻¹ of electricity.
Publication date
LanguageEnglish
AffiliationNRC Biotechnology Research Institute; National Research Council Canada
Peer reviewedYes
NRC number53369
NPARC number19663204
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Record identifieraff5ec5e-21e0-4df9-a3a3-052f61a0bba8
Record created2012-05-18
Record modified2016-05-09
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