PROJECT SUMMARY

Portage Regional Wastewater Treatment Facility Improvements

Client: Portage Area Sewer Authority, Cambria County, PA

Completed: 2010 Cost: $10,200,000

The Portage Area Sewer Authority provides regional wastewater service for 5,800residents. The original contact stabilization treatment plant had hydraulic capacitylimitations because of excessive sewer system inflow/infiltration. Gwin, Dobson &Foreman designed upgrades to the wastewater treatment plant that included araw sewage lift station, headworks, aerated grit chamber, equalization storage,ICEAS process treatment system and UV disinfection.

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The project included the following:

• Expansion of treatment plant capacity from 1.0 MGD to 2.0 MGD (average) and 6.0 MGD (peak).

• New headworks facility including flow diversion channels, gates and auger screening system.

• New aerated grit chamber with aeration system, grit classifier and grit storage.

• New raw sewage lift station with five (5) 1,300 GPM raw sewage submersible pumps for a total station capacity of 9.4 MGD.

• Conversion of existing contact stabilization tanks to equalization storage (0.6 MG) including coarsebubble aeration system, flow diversion box, level control and painting of steel structure.

• New suspended growth biological reactors for organic treatment and biological nutrient removal.The Intermittent Cycle Extended Aeration System (ICEAS) uses continuous activated sludgeaeration technology for organic removal and nitrification. An intermittent anoxic mixing cycleprovides denitrification. Settling is achieved by an articulated decant mechanism. All physical andbiological processes occur in a single reactor. Aerobic sludge digestion and storage are an integral component.

• New aeration system including centrifugal blowers, fine bubble diffusers and aeration piping.

• New energy efficient sludge dewatering system consisting of a rotary screw press with polymer feed system.

• Channel-type ultraviolet disinfection system with effluent channel and outfall.

• Instrumentation and control system (SCADA) for monitoring and operation of treatment system.

The $10.2 million project places the Authority in regulatory compliance. The increased capacityprevents system overflows and surcharging while providing future service area expansion. The new process has enhanced organic and nutrient removal capabilities. GD&F designed theoriginal treatment facility in the mid-1970’s and became the Authority consulting engineer in 1979.

PROJECT SUMMARY CONTINUED

Portage Regional Wastewater Treatment Facility ImprovementsClient: Portage Area Sewer Authority, Cambria County, PA

Completed: 2010 Cost: $10,200,000