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

Content Provider	Springer Nature Link
Author	Frigon, Jean Claude Roy, Caroline Guiot, Serge R.
Copyright Year	2011
Abstract	The 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.
Starting Page	341
Ending Page	349
Page Count	9
File Format	PDF
ISSN	16157591
Journal	Bioprocess Engineering
Volume Number	35
Issue Number	3
e-ISSN	16157605
Language	English
Publisher	Springer-Verlag
Publisher Date	2011-07-22
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Anaerobic digestion Switchgrass Panicum vergatum Digester Methane Industrial Chemistry/Chemical Engineering Environmental Engineering/Biotechnology Industrial and Production Engineering Food Science Biotechnology
Content Type	Text
Resource Type	Article
Subject	Medicine Bioengineering Biotechnology

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