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What is Semi-Continuous Air Sampling versus 24-Hour Bag Samples to Evaluate Biofilters on a Swine Nursery in Warm Weather about?

Economical and effective methods are needed to assess practices that reduce gas emissions. This project compared gas concentrations measured using semi-continuous sampling with dedicated gas analyzers versus concentrations obtained using 50 L FlexFoil bags filled over 24 h. Sampling was done over four months in summer and early fall of 2010 and 2011 from four biofilters (flat-bed with old media, A-frame, and two flat beds with either 10 cm or 5 cm screen birch mulch) treating air from deep manure pits below swine nurseries. Concentration ratios and percent reductions were calculated and compared using both sampling methods. The NH 3 , H 2 S, CO 2 , CH 4 , and N 2 O concentration data indicated that the 24 h bag sampling concentrations and percent reductions tracked the semi-continuous sampling concentrations and percent reductions well. Most (77%) of the NH 3 concentrations differences (24 h bag sample minus semi-continuous) were within ±2 ppm of the semi-continuous concentrations, 78% of the H 2 S concentration differences were within ±200 ppb, 87% of the CH 4 concentration differences were within ±10 ppm, and 88% of the N 2 O concentration differences were within ±75 ppb. Ratio m

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Publisher

American Society of Agricultural and Biological Engineers; American Society of Agricultural and Biological Engineers (ASABE) (ISSN 2151-0032)

Published

2014

Language

EN

Field

Environmental Science (Physical Sciences)