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Vertical Biofilter Construction and Performance

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  International Symposium on Air Quality and Waste Management for Agriculture, 16-19 September 2007, Broomfield, Colorado  701P0907cd.(doi:10.13031/2013.23843)
Authors:   Richard E Nicolai, Robert Thaler
Keywords:   biofilters, odor, emissions, odor abatement, swine

Biofilters are an effective technology in reducing odor and gas emissions from livestock facilities. A vertical biofilter may be an effective alternative when building layout may prevent application of a large horizontal biofilter. A problem with using a vertical biofilter occurs when the media settles causing non-uniform media porosity. Recent research has determined that media settling can be compensated for by tapering the media wall thereby resulting in more uniform airflow through the media. Several of vertical biofilters with an tapered inner wall have been constructed using hard wood chip as media to verify the earlier research findings on full scale biofilters in South Dakota and Denmark. The performance of the biofilters indicated that this configuration may be an effective means of reducing odor emissions from mechanically ventilated livestock barns. A structure problem did occurred on the Denmark biofilter. The outside and inside netting that holds the wood chip media broke free from the top attaching ring which was caused by media settling. A redesign of the netting attachment to the top tubular frame solved the problem and was implemented on the South Dakota biofilters with no failure after 9 mo of operation. Static pressure drop across the wood chip biofilter media increased by 18% after six months of settling.

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