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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
agricultural and biological sciences
Energy production from agricultural residues: High methane yields in pilot-scale two-stage anaerobic digestion
Biomass and Bioenergy, Volume 32, No. 1, Year 2008
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Description
There is a large, unutilised energy potential in agricultural waste fractions. In this pilot-scale study, the efficiency of a simple two-stage anaerobic digestion process was investigated for stabilisation and biomethanation of solid potato waste and sugar beet leaves, both separately and in co-digestion. A good phase separation between hydrolysis/acidification and methanogenesis was achieved, as indicated by the high carbon dioxide production, high volatile fatty acid concentration and low pH in the acidogenic reactors. Digestion of the individual substrates gave gross energy yields of 2.1-3.4 kWh/kg VS in the form of methane. Co-digestion, however, gave up to 60% higher methane yield, indicating that co-digestion resulted in improved methane production due to the positive synergism established in the digestion liquor. The integrity of the methane filters (MFs) was maintained throughout the period of operation, producing biogas with 60-78% methane content. A stable effluent pH showed that the methanogenic reactors had good ability to withstand the variations in load and volatile fatty acid concentrations that occurred in the two-stage process. The results of this pilot-scale study show that the two-stage anaerobic digestion system is suitable for effective conversion of semi-solid agricultural residues as potato waste and sugar beet leaves. © 2007 Elsevier Ltd. All rights reserved.
Authors & Co-Authors
Parawira, Wilson
Sweden, Lund
Lunds Universitet
Zimbabwe, Harare
University of Zimbabwe
Read, John S.
Zimbabwe, Ascot
Nust
Mattìasson, Bo B. O.
Sweden, Lund
Lunds Universitet
Björnsson, Lovisa
Sweden, Lund
Lunds Universitet
Statistics
Citations: 222
Authors: 4
Affiliations: 3
Identifiers
Doi:
10.1016/j.biombioe.2007.06.003
ISSN:
09619534
Research Areas
Environmental