Comparing NH3 emissions under different cattle housing conditions in cold regions in China with an inverse dispersion technique

In China, dairy cattle managed in collective feedlots contribute about 30% of the milk production and are believed to be an important contributor to national methane emissions. Methane emissions from a collective dairy feedlot in North China Plain (NCP) were measured during the winter, spring, summer, and fall seasons with open-path lasers in combination with an inverse dispersion technique. Methane emissions from the selected dairy feedlot were characterized by an apparent diurnal pattern with three peaks corresponding to the schedule of feeding activities. On a per capita basis, daily methane emission rates of these four seasons were 0.28, 0.32, 0.33, and 0.30 kg head−1 d−1, respectively. In summary, annual methane emission rate was 112.4 kg head−1 yr−1associated with methane emission intensity of 32.65 L CH4L−1of milk and potential methane conversion factor Ymof 6.66% of gross energy intake for mature dairy cows in North China Plain.

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Quantification of methane emissions from full-scale open windrow composting of biowaste using an inverse dispersion technique

Waste Management ◽

10.1016/j.wasman.2014.08.013 ◽

2014 ◽

Vol 34 (12) ◽

pp. 2445-2453 ◽

Cited By ~ 13

Author(s):

Marlies Hrad ◽

Erwin Binner ◽

Martin Piringer ◽

Marion Huber-Humer

Keyword(s):

Methane Emissions ◽

Full Scale ◽

Inverse Dispersion ◽

Dispersion Technique ◽

Windrow Composting

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Methane emissions from a swine manure tank in western Canada

Canadian Journal of Animal Science ◽

10.4141/cjas2012-072 ◽

2013 ◽

Vol 93 (1) ◽

pp. 159-169 ◽

Cited By ~ 12

Author(s):

Thomas K. Flesch ◽

Xavier P. C. Vergé ◽

Raymond L. Desjardins ◽

Devon Worth

Keyword(s):

Swine Manure ◽

Methane Emissions ◽

Western Canada ◽

Emission Rates ◽

Storage Duration ◽

Intergovernmental Panel ◽

Inverse Dispersion ◽

Calculation Methodology ◽

Dispersion Technique ◽

Solids Content

Flesch, T. K., Vergé, X. P. C., Desjardins, R. L. and Worth, D. 2013. Methane emissions from a swine manure tank in western Canada. Can. J. Anim. Sci. 93: 159–169. The emission rate of methane (CH4) to the atmosphere was measured from a concrete manure tank at a farrow-to-finish swine facility in western Canada. Measurements were made during four seasonal campaigns using a bLS inverse-dispersion technique. Emission rates were highest in summer and lowest in winter, with intermediate rates in spring and fall. Annual emissions were estimated at 7600 kg CH4, or 6.3 kg CH4 m−2 of tank surface area. Site-specific factors used for estimating CH4 emissions were calculated from our measurements. A simple methane conversion factor, used by the Intergovernmental Panel on Climate Change to relate emissions to the volatile solids content of the manure, was calculated as 0.23. This value may be unrepresentatively high due to the long duration (15 mo) that manure was stored in the tank. A more sophisticated calculation methodology considers the influence of manure storage duration and temperature, and includes a critical management design practices (MDP) factor. The MDP factor was calculated as 0.31 for our tank. This MDP value implies that emissions from our manure tank were lower than expected given the results from other studies.

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