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BIOLOGICAL FILTER MEDIA

Definition

Substrates for attachment of the microflora that degrade organics and oxidize soluble metabolic end products such as ammonia. Conventional biofilters employ sand and gravel . Materials with regular surface structures (e.g. Raschig-rings, plastic granules or beads) are preferred to those with irregular surfaces (e.g. slag). Modern filters (e.g. trickling filters, submerged downflow or upflow filters) make use of various plastic media structured as grids, corrugated sheets, balls, or honeycomb-shaped, wide-open blocks. In aquaculture, filter media with wide-open spacing are the preferred substrate types, providing an extensive active surface area for microflora settlement while at the same time avoiding clogging by suspended particles.

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