Methane production potential (B0) of swine and cattle manures - A Canadian perspective

Canada's agricultural emissions accounted for 60 Mt or 8% of national greenhouse gas (GHG) emissions in 2007. The estimation of CH 4 emission factor (B 0 ) from manure management systems in Canada is prone to uncertainty owing to lack of B 0 values for Canadian conditions. Therefore, in this st...

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Bibliographic Details
Published in:	Environmental technology 2010-11, Vol.31 (12), p.1371-1379
Main Authors:	Godbout, S., Verma, M., Larouche, J.P., Potvin, L., Chapman, A.M., Lemay, S.P., Pelletier, F., Brar, S.K.
Format:	Article
Language:	eng
Subjects:	Agriculture, rearing and food industries wastes Air pollution anaerobic digestion Anaerobiosis Animal Husbandry Animals Applied sciences Atmospheric pollution Beef biodegradability Biological and medical sciences Biotechnology Canada Carbon Dioxide - analysis Carbon Dioxide - metabolism Cattle dairy Exact sciences and technology Farms Fundamental and applied biological sciences. Psychology General treatment and storage processes Global Warming greenhouse gas Hydrogen-Ion Concentration Manure Manure - microbiology Methane Methane - analysis Methane - metabolism Methods. Procedures. Technologies Models, Chemical Others Pollution Reproducibility of Results Sewage Sodium Swine Uncertainty Various methods and equipments Wastes
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Summary:	Canada's agricultural emissions accounted for 60 Mt or 8% of national greenhouse gas (GHG) emissions in 2007. The estimation of CH 4 emission factor (B 0 ) from manure management systems in Canada is prone to uncertainty owing to lack of B 0 values for Canadian conditions. Therefore, in this study, manure samples from six Canadian animal farms, two each of swine, beef and dairy cattle, were investigated in order to estimate their methane production potential (B 0 ). The ultimate anaerobic biodegradability was measured with ISO standard batch fermentation. The extent of biodegradation of the manure samples with or without sodium benzoate was always greater than 60% and hence showed no inhibitory effect on methane production by the manure. The impact of use of antibiotics in the animal feed on methane production was also considered; however, no inhibitory effect on methane production could be observed. The plateau of methane production in all cases was achieved by 63 d of anaerobic digestion process and the final pH was within 6-8. The calculated B 0 were in the range of 0.47−0.42, 0.21−0.19 and 0.35−0.30 for swine, beef cattle and dairy cattle, respectively. The uncertainties associated with B 0 values were ± 9% for swine, ± 3% for beef cattle and, ± 6 and ± 2% for dairy cows.
ISSN:	0959-3330 1479-487X