Ammonia and hydrogen sulfide emissions from naturally ventilated free-stall dairy barns

H. S. Joo, P. M. Ndegwa, A. J. Heber, J. Q. Ni, B. W. Bogan, J. C. Ramirez-Dorronsoro, E. L. Cortus

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Emissions of ammonia (NH3) and hydrogen sulfide (H2S) from two naturally-ventilated freestall dairy barns are presented in this paper. Barn 1 (B1) housed 400 fresh-lactating cows, while Barn 2 (B2) housed 850 non-fresh-lactating cows. The relationships between NH3 and H 2S emissions and environmental factors (temperature, wind speed, and relative humidity) were evaluated. Average emissions of NH3 (32.3 g/d-cow) from the smaller B1 were approximately two times as the average emissions (16.6 g/d-cow) from the larger B2. Average emissions of H 2S, however, were similar at 2.05 and 1.74 g/d-cow from B1 and B2, respectively. Average emissions of NH3 and H2S were highest in summer (July) at 44.2 and 2.78 g/d-cow from B1, and 23.2 g and 1.92 g/d-cow from B2, respectively. The lowest emissions, on the other hand, were observed in winter (January) at 27.8 and 1.92 g/d-cow from B1, and 10.2 and 0.87 g/d-cow from B2, respectively. In general, emissions of NH3increased with temperature (R2=0.87) and wind velocity (R2=0.77), while inverse relationships were observed between NH3 emissions and relative humidity (R2=0.84). The correlations between H2S emissions and the same environmental parameters, in general, were poor (R 2 ≤ 0.01). Significant spikes of H2S emissions were observed during manure-flushing events.

Original languageEnglish (US)
Title of host publicationAmerican Society of Agricultural and Biological Engineers Annual International Meeting 2012, ASABE 2012
PublisherAmerican Society of Agricultural and Biological Engineers
Pages2739-2751
Number of pages13
ISBN (Print)9781622762088
StatePublished - 2012
EventAmerican Society of Agricultural and Biological Engineers Annual International Meeting 2012 - Dallas, TX, United States
Duration: Jul 29 2012Aug 1 2012

Publication series

NameAmerican Society of Agricultural and Biological Engineers Annual International Meeting 2012, ASABE 2012
Volume4

Other

OtherAmerican Society of Agricultural and Biological Engineers Annual International Meeting 2012
CountryUnited States
CityDallas, TX
Period7/29/128/1/12

Keywords

  • Ammonia
  • Dairy barns
  • Emissions
  • Hydrogen sulfide
  • Natural ventilation

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