Ammonia Wastewater Treatment: Wastewater Treatment Plant (WWTP) Centrate & Landfill Leachate
Wastewater Treatment Tour
Transcript of Wastewater Treatment Tour
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Wastewater Treatment TourPrimary Treatment: Physical processes
Secondary Treatment: Biological processes
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Main Pump Station
Raw sewage flows by
gravity sewer pipelines,
from parts of 10 different municipalities.
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The Grit and Grease Removal
The heaviest
material, (mainly
grit) settle to the
bottom of the tank.
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Equalization Basins
Equalize the normal daily flow
fluctuations. Diffused air is
pumped in to keep the
wastewater fresh and keep solids in suspension
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Oxidation DitchMicroorganisms
metabolize (feed on), and
biologically flocculate
(clump together) the
organic pollutants.
Nitrogen and phosphorus removal also occurs here.
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Final Clarifier TankActivated sludge is allowed
to settle by gravity. Some is returned by pumps to the Oxidation Ditch to maintain the continuous cycle of activated sludge in the system.
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Ultraviolet Disinfection SystemThe effluent is exposed to high
intensity ultraviolet light for the
destruction of any remaining
pathogenic (disease-causing) organisms.
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Dissolved Air Flotation ThickenerBlends the sludge with
pressurized, air-saturated
water. This causes water to
separate out of the sludge and
the sludge to float to the
surface and thicken. The
Flotation Thickener will
concentrate the thin (½ %
solids) waste activated sludge
up to about 6% thickened
sludge, thereby removing
much of the water prior to
further processing.
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Dissolved Air Flotation Thickener
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Anaerobic Digesters
Digestion is a biological
process that reduces the
amount of organic solids in the sludge. A bi-product of the process is methane gas, which is used for fuel to heat the sludge, making the process self-sustaining.
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Centrifuge
Removes water from
the liquid sludge into a
cake-like material at a at a solids concentration of 20-25%.
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BioSolids Dehydrator
The resulting granular material, now called BioSolids, has a dry solids content of about 90%.These Biosolids meet all Class “A” standards under EPA Regulations-Part 503, and also meet Pennsylvania DEP standards as “Exceptional Quality”. Under these regulations, the material may now be distributed as a soil conditioner and fertilizer.
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BioSolids
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