Environment

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Prairie Swine Centre is an affiliate of the University of Saskatchewan


Prairie Swine Centre is grateful for the assistance of the George Morris Centre in developing the economics portion of Pork Insight.

Financial support for the Enterprise Model Project and Pork Insight has been provided by:



Author(s): Ni, J.Q., A.J. Heber, T.T. Lim and C.A. Diehl
Publication Date: January 1, 1999
Reference: Paper 994132. 1999 ASAE Annual International Meeting. July 18-22, 1999. ASAE, 2950, Niles Road, St.Joseph, MI 49085-9659. 15p.
Country: United States

Summary:

Hydrogen Sulfide emissions were continously measured from two mechanically ventilated 1,000 head swine finsihing barns for a period of six months, encompassing two partial growth cycles. Hydrogen sulfide measurements were taken at three different location: pit head-space, pit fans and wall fans. Daily mean hydrogen sulfide emissions ranged from 32 – 1,867 g/d averaging 487 +/- 50 g/d for Barn 3B. Emissions ranged from 131 – 1,770 g/d, averaging 727 +/- from Barn 4B, representing a 47% higher rate than 3B. The mean emsission rates per pig were 580 +/- 63 and 850 +/- 121 for 3B and 4B respectively, with 4B 47% higher.

Siognificant differences in emission rates occurred between the first and second growth cycles. The daily mean H2S emission rate in 3B was 322 g/d and 585 g/d for cycle 1 (before June 16) and 2 (after June 20) respectively, with the second cycle being reported 1.8 times greater than the first cycle. Even greater differences were found with 4B. The mean building H2S emission rates were 351 g/d and 1,296 g/d between the first and second cycle. The emission reported from the second was 6.1 greater than the first cycle. Outdoor temperatures were 9.1 and 5.5 degrees Celcius higher in the second cycle, as a result the airflow rates were 72.7 and 25% greater in the second cycle as well.

Higher temperatures enhance the production of H2S in the manure pit and release of gas from the liquid manure. Air velocity over the manure surface has a significant influence on convective mass transfer of pollutant gas from liquid manure to the air stream in the building. Air speed is influencd by the airflow rate, which automatically adjusts to the indoor temperature.

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