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Wastewater filtration is a physical or mechanical process used to remove impurities from wastewater. It initially involves the removal of suspended solids, bacteria and debris, leading to water clarification and producing safer water for discharge or reuse. Biofiltration adds the microbial metabolism of pollutants to the simple physical removal of solids. Common biofilter materials include inert media such as plastic, ceramic or zeolite, selected for their high surface-to-mass ratio, as biofilm-based processes occ...