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Dust and Particulate Control for Animal Housing Systems with Liquid Manure - Filtration
Filtration
serves as a mechanism for trapping dust and particulates. Mechanical
filtration traps approximately 45 percent of particles between
5 and 10 µm, and 80 percent of the particles greater
than 10 µm from animal housing areas. Mechanical filtration
reduces the odor dilution threshold by 40 to70 percent. The odor
dilution threshold is defined as the concentration at which 50
percent of a human panel can identify the Biofilters must be designed to provide suitable conditions for growth of a mixture of aerobic bacteria within the biofilter. Oxygen concentration, temperature, residence time, and moisture content are among the parameters that must be considered when building a biofilter. Although management must be taken into consideration, it is clear that low-cost biofiltration systems ($150 to $200 per 1,000 cfm of air treated) can be implemented in livestock housing facilities. Extension Publications
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presence of an odor or
odorant without characterizing the stimulus. Biofilters trap particulates
and also provide an environment for biological degradation of trapped
compounds, contributing to odor reduction beyond the accounted
for by dust removal alone. Although mechanical filtration may be
costly, biofiltration can be a low-cost means for effectively reducing
exhaust dust. Biofiltration costs, at a 700-head farrow-to-wean
swine facility, are estimated at $0.25 per piglet produced, amortized
over a 3- year life of the biofilter. Odor reductions at the operation
exceeded 90 percent with similar reductions in hydrogen sulfide
(90 percent) and ammonia (74 percent). Similar odor and hydrogen
sulfide reductions were observed using biofiltration on a dairy
facility. Performance in a poultry facility, however, was poorer,
with an odor and hydrogen sulfide reduction of less than 40 percent,
likely due to the volume of dust present in the facility.
