Biofilters (air) are facilities to control and purify biological waste gas. They are developed to reduce and eliminate biogenic odours and represent a relatively simple technical installation. The application of biofilters is diverse, including for example agriculture, sewage treatment plants, biogas plants, and composting plants. The term “filter” is misleading in terms of their service: Biofilters (air) does not separate solid particles from gas or water but separate gaseous/dissolved substances through biodegradation. Bacteria and microorganisms are located on a filter medium (breeding ground) that absorbs odours of the air stream (e.g. peat, tree bark, and root wood fibre). The microorganisms on the filter degrade the absorbed, biological substances (biological oxidation) and thus purifies the exhaust air passing the filter material. Biofilters exist in different sizes and structural shapes (often in a box).
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