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Water and Wastewater Plant Directory
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York, Pennsylvania, USA
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York Wastewater Treatment Plant
1701 Blackbridge Road
York, Pennsylvania, 17402
USA
Contact Information:
Contact: Mike Page
Email:
mpage@yorkcity.org
Telephone: 717-845-2794
Fax:
Plant Operation: Municipal
Processing: Wastewater
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Web site:
http://www.yorkcity.org/cityservices/wwtp/index.htm
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Plant/Process Description:
The 26-mgd wastewater treatment plant is owned by
the York City Sewer Authority and operated by
group of dedicated professionals of the City of
York. Wastewater from the City and all or
portions of North York Borough, West York
Borough, Manchester Township, West Manchester
Township, York Township, and Spring Garden
Township is sent to our facility. The wastewater
treatment plant consistently meets the limits
placed on it by the United States Environmental
Protection Agency and the Pennsylvania Department
of Environmental Protection.
Preliminary Treatment
The first step in treating the wastewater
entering the treatment plant is to remove RAGS
(things like paper towels) and GRIT (sand and
gravel).
This is a two step process. First, the rags and
other large material are removed using bar
screens. The Bar Screens have narrow slits that
capture this material, while letting the
wastewater pass through to the next stage of
treatment. The debris is removed in this stage of
treatment so it will not interfere with the other
stages further downstream.
The cyclone degritters remove sand and grit from
the wastewater. This prevents wear and tear on
pumps and piping within the rest of the treatment
facility.
Primary Treatment
The primary treatment process consists of a
series of tanks that allows the separation of
heavy solids (fecal matter) and floating solids
(greases and oils) from the wastewater. The
primary clarifiers are sized to permit enough
detention time so that large solid material
settles to the bottom of the tanks. These solids
are then continually scraped from the bottom and
transferred to the anaerobic digesters for
further treatment.
Greases and oils are collected from the surface
of these tanks and are also conveyed to the
anaerobic digesters.
Secondary Treatment
In secondary treatment the majority of pollutants
are removed. This treatment phase utilizes micro-
organisms to remove the food and nutrients
(pollutants) that are found in wastewater.
As the wastewater enters this particular phase of
treatment, the micro-organisms are introduced.
Then an anoxic or low dissolved oxygen zone
follows. Next, this liquor is aerated so the
dissolved oxygen can be increased to allow
nitrification and biological phosphate reduction
to occur.
The York facility, through a patented process and
tank design, is able to have these micro-
organisms metabolize the organic matter and
convert ammonia to nitrates. The process also
allows the micro-organisms to uptake ortho-
phosphates into their cells.
After the aeration stages, the mixed liquor
(micro-organisms and wastewater) enter the
secondary clarifiers. Here the velocity of the
wastewater is slowed to allow for the biomass to
clump together and settle to the bottom while
allowing the clean water to flow over the tank
weirs. Large pumps return the micro-organisms
from the bottom of these secondaries and return
them to the beginning of the secondary treatment
phase to start the cycle all over again.
During secondary treatment the micro-organisms
reproduce in great numbers. To keep the system
in check a portion of these critters removed
through a wasting process. This sludge is
thickened in our dissolved air floatation
thickener and this thickened material is sent to
the anaerobic digesters.
Sand Filtration & Ultraviolet Disinfection
Sand Filtration
In 1990, the York WWTP installed 5 shallow
bed sand filters which removed any remaining
particulate matter after secondary treatment.
These filters were capable of treating a maximum
peak flow of 42 mgd. Effluent leaving the Sand
Filters typically had suspended solids
concentrations of less than 5 mg/l.
In 2000, the sand filters were modified with a
more efficient under drain and backwash system.
The maximum peak flow through these units is now
55 mgd. Cost of this renovation was $3,000,000
less than adding additional filters to handle the
new peak flows.
Ultraviolet Disinfection
An ultraviolet light system is used to disinfect
the effluent that leaves the sand filter
process. In 2001 the existing system was
upgraded to the Trojan UV3000 Plus . Unlike our
previous Trojan Technologies system, the 3000Plus
series utilizes a low pressure-high intensity
lamp. This enabled the York facility to reduce
the number of lamps needed for disinfection from
1728 to 768.
The UV light inhibits any bacteria
from replicating, thus making them harmless. This
system has proven to be much safer than Chlorine,
while being more cost effective. No toxic
chemical needs to be added in the disinfection
process. In addition, the 3000 series also has
automatic wipers so operators do not have to
spend time cleaning the lamps, thus saving on
labor costs.
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Owner:
York City Sewer Authority
Web site:
http://www.yorkcity.org/gov/boardsauthorities/index.htm
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Operating Company:
York City Sewer Authority
Web site:
http://www.yorkcity.org/gov/boardsauthorities/index.htm
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Directions:
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Disclaimer:
Water and Wastewater.com provides the information on
this page for reference purposes only. We do not certify
the accuracy of the information provided by third-party
individuals for this listing.
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