| Treatment
Technology: Trickling
Filter |
Trickling
filters provide aerobic treatment of wastewater. Wastewater
is generally pumped from a recirculation tank or compartment,
dispersed over a media bed, and allowed to drain back into
the tank. The wastewater is aerated as it flows through the
media bed, which may consist of a variety of media such as
polystyrene beads, rigid plastics, or tire chips. A trickling
filter uses filtration, adsorption, and assimilation for
removal of contaminants from wastewater. Wastewater should
flow in a thin film over the media to allow time for treatment. |
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| A
treatment train containing a trickling filter |
In
the example system to the right, wastewater flows by gravity
through a building sewer (A) from the house into a septic
tank (B) where solids separation occurs. Wastewater then
flows from the septic tank into the trickling filter (C),
where four pumps are located. The first pump doses wastewater
to the top of media pillows containing polystyrene beads.
Wastewater trickles through the media and flows by gravity
back into the sump area of the tank. This recirculation process
will reoccur several more times. A
second pump transfer some effluent to the head works of the
septic tank for denitrification (D), and a third pump transfers
accumulated sludge to the inlet of the septic tank (E). |
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| Treated
final effluent is pressure dosed by a fourth pump to a bottomless
sand filter (F) for final dispersal and treatment.The
effluent is dispersed onto and filters through specific sand
media in the bottomless
sand filter before it reaches the shallow surface
soils where further nutrient removal and pathogen reduction
may occur. A programmable
logic control is used to control and time all dosing events. |
| Treatment
performance observed for trickling filters in RI |
| System |
BOD5 |
TSS |
TN |
% TN Reduction |
Fecal Coliform |
| Coming
Soon! |
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| For
more information on textile filters: |
Web
Links: This type of technology is designed
and manufactured by several companies. For more information,
please see the vendor websites:
AquaPoint:www.aquapoint.com/html/bioclere.html
SeptiTech: www.septitech.com |
