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<emphasis role="bold">BIOLOGICALLY ACTIVE FILTERS</emphasis>
<emphasis role="bold">BIOLOGICALLY ACTIVE FILTERS</emphasis>Biological wastewater treatment and suspended-solids removal are carried out in biologically active filters (BAF) under either aerobic or anoxic conditions. In a BAF, the media acts simultaneously to support the growth of biomass and as a filtration medium to retain filtered solids. Accumulated solids are removed from the BAF through backwashing. There is a direct interaction between the media characteristics and the process, because the configuration (sunken media or floating media), and flow and backwash regimes depend on media density. Media may be natural mineral, structured plastic, or random plastic.
Water Environment Federation: Design of Municipal Wastewater Treatment Plants: WEF Manual of Practice No. 8 ASCE Manuals and Reports on Engineering Practice No. 76, Fifth Edition. BIOLOGICALLY ACTIVE FILTERS, Chapter (McGraw-Hill Professional, 2010), AccessEngineering Export