Is a biofilter practical in a cold climate?
Biofilters are definitely working in cold climates. Pollutant removal may be slower at low temperatures, so the options are 1) to heat the air and insulate you reactor (gets expensive), 2) have a less efficient reactor in winter (thus bigger = more costly). The right balance needs a cost-benefits analysis. In general, biofilters for odor control are less sensitive to low temperature than biofilters for VOC control. You might want to find out vendors who have installed biofilters in cold climate and talk to their customers.
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