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| Treatment
Technology: Single pass
peat filter |
Peat media
filters consist of a distribution system, peat media, and
an under-drain system. Peat filters typically come in pre-fabricated
modular units made of fiberglass or high-density polyethylene.
Some filters are gravity-fed, using a tipping distribution-box
mechanism. Others are pressure-dosed using either demand-dosed
or time-dosed pumps. Types of peat material are sphagnum
peat (from North America) and coarse fibric peat (from Ireland).
After effluent passes through a peat filter, it can be pressure-dosed
or gravity-fed to the drainfield dispersal component. |
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| A
treatment train containing a peat filter |
| Wastewater
leaves the home through the building sewer (A) flowing by
gravity to the processing tank (B), where solids, fats, oils,
and greases are trapped and stored. Wastewater is dosed to
the peat filter (C), where the peat media and microorganisms
reduce the strength of the wastewater. The effluent flows
by gravity to a pump chamber (D). The effluent is pumped
to shallow narrow drainfield lines (E) for final dispersal
into the shallow surface soils where further nutrient removal
and pathogen reduction may occur. Some peat filters are used
in the bottomless form, as a means of final dispersal to
the soil environment; this configuration is not approved
for use in Rhode Island. |
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| Treatment
performance observed for peat filters in RI |
| System |
BOD5 |
TSS |
TN |
% TN Reduction |
Fecal Coliform
CFU
|
Waterloo
Biofilter |
2.8mg/L |
2.3mg/L |
47.1mg/L |
12.9mg/L |
1040mg/L |
| For
more information on peat filters: |
| Web
Links: This technology is a proprietary device under
the trade name Puraflo Peat Biofilter, manufactured and distributed
by Bord Na M?na – Environmental Products USA, Inc. For
further information about this technology, see the vendor website
at www.bnm-us.com. |
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