Biofiltration has been gaining increased interest for removing odor and unwanted compounds in exhaust air from farms, biogas plants and composting sites. Ammonia is an important compound as it contributes to both odor emission and to atmospheric deposits of nitrogen which may disturb "delicate ecosystems." Now researchers at Aalborg University in Denmark have compared yard waste and sludge compost to their efficiency as biofilter material for removing ammonia from air. All filter columns using the compost were able to remove more than 95 percent of the ammonia in the inlet regardless of compost type and applied air …
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