american water acquisition - 2010
TRANSCRIPT
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100 Bob House Parkway, Suffolk, VA 23432
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A rural lake in Chuckatuck, VA
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is filled by rain and groundwater run-off.
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An elevatedplatform at the waters edge,
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kept locked and secured,
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is
filled
withpumps
and
pipes
which
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draw surface water from the lake and send it to
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outdoor pools where the treatment processbegins.
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Two large pools on either end of a raised platform
surround six smaller pools in a central walkway.
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The first small pool in the center holds surface waterdrawn from the lake. It is turbid (muddied & unclear)
with suspended particles of dirt and organic material.
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Inside each small pool, metalpaddlewheels
slowly turn the water from the lake and
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theirmotion, aidedby the addition of a
chemical flocculant, causes tiny
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dirt particles to coagulate and float on the
pools surface. The clearer water below
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is then piped along the bottom
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of the two large sedimentation tanks at
either end of the outdoor platform.
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There it is allowed to enterthese large tanks by
slowly rising to the top of circular diffusers.
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Then, as this water sits in each
sedimentation basin,particulate matter
continues to settle to the bottom
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while clearwater at the surface trickles
over a weir at the edge of the tank
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and
runs
along
exterior
channels.
Thesetransport
the
now
clarifiedsurface
water
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inside the adjacentbuilding
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where electrodeionization removes the
last remaining organic contaminants and
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chemical disinfection treats any viruses,bacteria or other pathogens which may
have escaped the filtration process.
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Following
this final
disinfection,
the surface water
that wasfirst pumped
from the
country reservoir,
is at lasttransferred
to
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water storage domes at the edge of the complex.
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Occasionally, the sedimentation tanks usedto clean this surface water must be cleared
of the sludge which the process generates,
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where natural evaporation carries off the water
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and the dried particulate which remains
is removed to a landfill.
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This
deep
groundwater
is storedin huge
fiberglass tanks
beforeit is
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purified with chemicals
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that
havebeen
delivered,
unloaded
and
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stored outside the complex.
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Inside the building, salt and fluoride levels
occurring naturally within the deep-well water
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are reducedbypassing that water
through row upon row of
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electrodialysis reversal units.
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Following this
electronictreatment,
pipes
take
thedeep-well
groundwater
from
the
EDRunits
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and
combineit
with
surface
water
treated
earlier
in thesedimentation
tanks.
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The
resulting
mixture
is
then
agitatedby
right-angle
bends
as itis
pushed
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through
along,
serpentine
pipeline
that
carries
the
blendeddrinking
water
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to storage outside the complex where it awaits
delivery to thousands ofindividual homes.