A Catalyst in Economic Growth

PENNSYLVANIA GAS & WATER COMPANY (PG&W), SCRANTON, PENNSYLVANIA, LAKE SCRANTON WATER TREATMENT PLANT
The $32-M Lake Scranton Water Treatment Plant is a 33 mgd plant scheduled for completion by the summer 1990. The plant was designed be Gannett Fleming Water Resources Engineers, Harrisburg, Pennsylvania, and is being constructed by DANIS Industries Corporation. The Lake Scranton Water Treatment Plant process consists of upflow clarification, followed by granular media filtration, and includes: (1) pre-chemical addition (powder-activated carbon, chlorine, chlorine dioxide, lime, alum, polymer) (2) three two-chamber vertical flow mixing basins (3) two baffled contact basins which can be bypassed (4) eight upflow contact flocculator / clarifier units (5) eight mixed-media filters (6) post chemical addition (chlorine, polyphosphate, lime, caustic soda) (7) two 2.5-million-gallon storage tanks.
The mixed-media filters consist of the following materials furnished and installed by UNIFILT, under a contract agreement with DANIS:

• 13 inches of Support Gravel
• 2 inches of High-Density Gravel
• 3 inches of High-Density Sand
• 9 inches of Filter (Silica) Sand
• 18 inches of Filter Anthracite / Anthrafilt

Each filter has a surface area of 726 square feet with a design surface-loading rate of 3.9 GPM per square foot at maximum flow. Filter backwash consists of both an air and water wash. The source of backwash is from the plant clearwell. Backwash is initiated by the plant operator on loss of head, filter effluent turbidity or time.

MODEL FOR THE FUTURE
When in operation this plant will provide filtered water to approximately 140,000 people in Scranton and surrounding communities.
"The start of construction of the water treatment plant is an important milestone for both the Scranton area and Pennsylvania Gas & Water Company," said Robert L. Jones, President of PG&W. "The quality water processed at this facility will help fuel the economic growth of this region as we move into the twenty first century."
Officials indicate that water treated at the plant will exceed state and federal guidelines for purity and will show a marked improvement in quality to the average user. In addition to limiting turbidity and color, the plant will also:

• remove microorganisms, including giardia cysts, as well as provide an additional barrier against other microorganisms by disinfecting with adequate chlorine time;
• reduce levels of trihalomethanes.

"The water quality will be of a more consistent quality and be free of turbidity. And it will remove iron and manganese which are occasionally troublesome," explained Dave Kaufman, PG&W's Project Engineer. "One of the most noticeable things will be the reduction in chlorine levels, since the plant will allow for a longer contact time."

OTHER PENNSYLVANIA GAS AND WATER COMPANY AND UNIFILT PROJECTS:

UNIFILT FILTRATION MEDIA…

Meeting Today's and Tomorrow's Requirements
Today, UNIFILT and its field sales and service force are a welcome partner in developing specifications with the designers and engineers of water treatment plants, as well as a qualified source of media-related cost estimates for plant contractors and owners.
As the need for a trusted single-source servicer and supplier of filtration media grows, engineers, designers and contractors have come to depend and rely upon UNIFILT.
And we are committed to growing with this marketplace. By anticipating future requirements, by expanding our capabilities and by meeting the changing requirements of this demanding industry, UNIFILT will remain a leader in the supply and in the technology of filter maintenance.

COMPLY? THEN RELY ON UNIFILT

The Trusted Name in Filter Maintenance and Media Systems UNIFILT is your dependable single source for filter maintenance and media systems. Since 1977, UNIFILT's reputation has been based on its ability to supply filtering media, which not only meets AWWA Standards, it exceeds them.
We don't stop there.
UNIFILT provides technical expertise in all phases of filtration engineering - from specification to installation.
And we are committed to developing new technologies that anticipate your future needs. Rely on the leader, rely on UNIFILT…We're a welcome partner in today's demanding water treatment industry.

FILTER MAINTENANCE SERVICES AND MEDIA SYSTEMS:

• Evaluation of Existing Media Systems
• Removal / Installation of Filter Media
• Evaluation of Filter Components
• Inspection / Removal / Replacement of Filter Bottoms
• Installation of New Alluvial Support Gravel
• Total Filter Rehabilitation
• New Low-Velocity Material Placement Equipment
• Total Filter Media Systems

UNIFILT CORPORATION
P.O. Box 1627
Wilkes-Barre, Pennsylvania 18705
800-223-2882
www.unifilt.com

We're on Standby Near You. Call Toll Free, 1-800-223-2882.