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Biological filter tank Illustration and Icon
Biological filter tank
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A schematic of a circular trickling filter shows a rotating distribution arm spraying influent over a packed media bed within a concrete tank. In hierarchy, a microbial biofilm (microorganisms and extracellular matrix) colonizes the filter media inside this engineered bioreactor, part of the secondary treatment unit of a municipal wastewater treatment plant (WWTP). In environmental microbiology and sanitary engineering, this system (TF, trickling filter) aerobically reduces biochemical oxygen demand (BOD) and enables nitrification, with influent and effluent conveyed by inlet and outlet pipes.
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