A recirculating media filter is a method of pretreatment that provides aerobic treatment of wastewat

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A recirculating media filter is a method of
pretreatment that provides aerobic treatment of
wastewater. The wastewater is generally pumped
from a pump/recirculation tank, dispersed over a
media bed, and allowed to drain back into the
tank. The wastewater is aerated as it flows over
the media. The media is constructed from a
variety of plastics, textile, stone, or redwood
laths into a number of shapes (honeycomb blocks,
rings, cylinders, etc.). A biological film grown
on the media feeds on the contaminants contained
in the wastewater. As the film establishes and
grows, it will exceed the ability to hold onto
the media. The biological materials slough off
and return to the pump/recirculating tank with
the wastewater for further decomposition.