Comparison of Biofilter Residence Time
نویسندگان
چکیده
Residence time is a critical factor in determining the size of an open face biofilter. Four test biofilters were constructed with media comprised of yard waste compost and brush chips to compare 8 s. and 4 s. residence time. Biofilter performance was monitored for ten months by measuring pressure drop, moisture content, odor threshold, hydrogen sulfide, and ammonia concentrations. Odor reduction efficiency for the 8 and 4 second residence time biofilters is 91% and 87% respectively. Hydrogen sulfide reduction efficiency is 97% and 96%. Ammonia reduction efficiency is 82% and 74%. There is no significant difference between an 8 s. and a 4 s. empty bed contact time for odor, hydrogen sulfide, and ammonia removal. Based on current information, the design residence time for biofilters on swine buildings is 4 to 5 seconds. Further research is needed to determine the minimum effective residence time for open face biofilters on livestock facilities.
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