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Effects of Manure Managements on Ammonia, Hydrogen Sulfide and Greenhouse Gases Emissions from the Naturally Ventilated Dairy Barn
Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.orgCitation: Paper number 131593447, 2013 Kansas City, Missouri, July 21 - July 24, 2013. (doi: http://dx.doi.org/10.13031/aim.20131593447) @2013
Authors: Hung-Soo Joo, Pius M Ndegwa, George M Neerackal, Xiang Wang, Joe H Harrison
Keywords: Air emission mitigation, manure management, flushing, scraping, solids separation.
Greenhouse gases (GHG), ammonia, and hydrogen sulfide emissions from a naturally ventilated dairy barn which housed 850 lactating cows were measured following implementation of alternative manure management strategies. The manure management strategies included: (i) more frequent flushing from every 6 h to every 3 h, (ii) alternating flushing and scraping, and (iii) centrifuging solids from flush water. Concentrations of gases in the air within the barns were compared to concentrations during the normal every 6 h manure flushing with recycled secondary lagoon water.
Ammonia emissions (31 g-NH3/cow/d) after doubling flushing frequency (from 6 h to every 3 h) was similar as for the normal every 6 h flushing (32 g-NH3/cow/d), while CO2 and N2O emissions were reduced by 12% and 9%, respectively. On the contrary, CH4 and H2S emissions for the 3 h flushing regime were 9% and 186% higher than for the 6 h flushing-cycle. Alternating flushing and scraping every 6 h reduced CO2 and H2S emissions by 10% and 17% than the 6 h normal flushing. The concentrations of other gases were similar. Centrifuging to separate solids from the flush water was significantly more effective than the other manure management strategies. Reductions of concentrations in the air in the barns after centrifuging flush water were: 37 % for NH3, 37 % for N2O, 24% for CO2, and 42 % for H2S.(Download PDF) (Export to EndNotes)