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Water and Wastewater Plant Directory
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Alexandria, Virginia, USA
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Alexandria Sanitation Authority
1500 Eisenhower Avenue
Alexandria, Virginia, 22314
USA
Contact Information:
Contact: Karen L. Pallansch, Engineer-Director
Email:
klpallan@alexsan.com
Telephone: 703-549-3381
Fax: 703-549-9671
Plant Operation: Municipal
Processing: Wastewater
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Web site:
http://www.alexsan.com/
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Plant/Process Description:
Our plant is an Advanced Waste Treatment (AWT)
facility with a design capacity of 54 million
gallons per day (MGD). It is located on a 33-
acre
site on the north bank of Hunting Creek near its
junction with the Potomac River. We provide
sewage treatment for 325,000 people in a service
area of 51 square miles, which includes the City
of Alexandria and portions of Fairfax
County.
The original plant, which was placed in service
in 1956, was an 18 MGD trickling filter
facility.
In 1984, we completed construction of a $101
million expansion and upgrade project to provide
additional capacity and advanced treatment.
Treatment processes include preliminary,
primary,
and secondary treatment followed by chemical
addition (metal salt) for phosphorus removal,
carbon adsorption, filtration, chlorination, and
dechlorination and post aeration. Solids
processing consists of gravity sludge
thickening,
anaerobic digestion, centrifuge dewatering, lime
addition and land application.
The Authority owns and operates three pump
stations and three interceptor sewers. ASA is
currently upgrading its 54 million gallon per
day
design flow facilities to meet the water quality
requirements of the Potomac Embayment Standards
and the Chesapeake Bay Agreement. Initial
operation of the new Biological Nutrient Removal
(BNR) system was achieved in December 2002. This
system has reduced nitrogen discharges from the
plant by approximately 70 percent.
Part of the upgrade includes the construction of
a 119-ft tall solids processing building. This
building houses new Sharples thickening and
dewatering centrifuges, an RDP lime-addition
system, biosolids storage hoppers, polymer feed
systems, a primary effluent pump station and
plant-wide odor control and chemical feed
systems.
The biosolids handling process flow train is a
completely automated system tied into a central
control point using a Supervisory Control and
Data acquisition (SCADA) system specifically
designed for the ASA facility. Operation of the
new solids handling facility began in July
2003.Construction has just started on two new
digesters and a pre-pasteurization unit that
will
produce Class A biosolids. This project is
anticipated to be on line in late 2005.
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Owner:
Alexandria Sanitation Authority
Web site:
http://www.alexsan.com/
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Operating Company:
Alexandria Sanitation Authority
Web site:
http://www.alexsan.com/
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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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