Plant Profile
Influent to the plant is received from a system of underground
trunk sewers in the City of Grandville and Ottawa County. These
trunk sewers then join together where the sewage is pumped into the
treatment plant. The plant is a conventional activated sludge plant
with a design capacity of 4.4 million gallons per day (MGD).
Raw wastewater enters the plant at the screening structure and
passes through a manually cleaned bar screen. It is then pumped to
three grinders which are followed by an air degritter. Ferrous
chloride is fed into the waste stream at this point to facilitate
phosphorus removal. The pretreated raw sewage then flows to a flow
splitter where it is directed to the primary clarifiers. Sludge
produced in the primary clarifiers us pumped to the anaerobic
digesters.
Following primary treatment the settled sewage is directed to the
aeration basins. Here the primary effluent is combined with
reaerated sludge. The combined sewage flow now called "mixed liquor"
is then directed through a series of control structures and then to
the final clarifiers.
The final clarified effluent flows to an effluent splitter box
where it normally enters the chlorination basins. Settled activated
sludge from the final clarifiers is either (1) returned to the
preaeration basin or (2) wasted to the aerobic digestion basins.
An Ultra Violet (UV) Disinfection System is provided for meeting
the city's NPDES fecal coliform limit. Following effluent UV
treatment plant effluent passes through a 4.4 million gallon pond
that was previously used for dechlorination.
Waste activated sludge and scum are pumped to the aerobic
digestion basins. This sludge is combined with digested sludge from
the primary anaerobic digested and then pumped to the sludge
dewatering devices. Depending on which dewatering device that is
used the concentrated sludge is either (1) pumped into tanker trucks
for removal and ultimate disposal or (2) placed in the drying beds
for temporary storage. Ultimately all of the bio-solids produced are
supplied to agricultural land.
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City of Grandville
3195 Wilson Avenue SW
Grandville, MI 49418
(616) 531-3030
This page last modified
07/01/11 .
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