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The Filtration Solution
Raw
feedwater is introduced at the top of
the filter vessel under pressure and
flows downward through the filter media.
During the downward flow of raw water,
most of the suspended solids are trapped
in the uppermost layer of the media,
while some are captured in the void
spaces between the filter media
particles. Also, some dissolved
impurities are adsorbed or absorbed in
the filter media. The filter media may
react with the dissolved impurities or
may act as a catalyst to initiate
reaction.
For
treatment of raw water containing
suspended solids, sand is the most
common media. Coarse media such as
anthracite is added to the uppermost
layer of the sand media when filtering
raw water with relatively high suspended
solids such as wastewater. The coarse
media will retain larger particles that
cause premature blinding of the sand
media.
The
combination of filter media of various
sizes and densities arranged in layers,
provides high filtration efficiency as
the entire depth of the bed is utilized.
Depth filtration is effective and
achieves longest filter runs.
Removal
of dissolved iron or manganese in raw
water can be achieved using Manganese,
Greensand or BIRM. BIRM is a proven
media effective in precipitating
dissolved iron and manganese in water,
without the addition of chemicals.
Most
organic impurities causing taste and
odor can be effectively removed using
activated carbon media. Activated carbon
media is also effective in removing
chlorine, toxic impurities and
substances suspected of causing cancer.
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EBD
Water manufactures a wide range of
pressure filters with diameters ranging
from 18" to 48" using vertical
GRP vessels, from 30" to 130"
for vertical welded steel vessels, and
from 48" to 144" for
horizontal welded steel vessels.
