Project Categories » Wastewater » Treatment Plant Improvements


Treatment Plant Improvements

The Township of Ocean Sewerage Authority (TOSA) was created September 8, 1964, to construct and operate a wastewater collection system and treatment plant to service Ocean Township and adjoining municipalities in the area. TOSA currently owns and operates a 7.5 mgd sewage treatment plant located on Roosevelt Avenue in the Oakhurst section of Ocean Township. Other wastewater facilities owned and operated by the Authority include twelve sewage pumping stations, approximately 140 miles of gravity trunk sewers, two siphons, interceptors and collection sewers ranging in size from 8 to 36 inches in diameter and nearly six miles of force main.

The Treatment Plant Improvement project included the construction of a new Sodium Hypochlorite Facility, replacing the internal mechanisms in Final Clarifier No. 3 & 4 and concrete restoration of four clarifier tanks and the chlorine contact tank.
The existing Sodium Hypochlorite Facility that housed the pumps and controls was installed in 2003 and was intended to be temporary. The facility was a wood structure and it had started to decay. The new facility included a containment area for unloading the sodium hypochlorite to the two on site storage tanks. A precast concrete building was selected to house the chemical feed pumps, analyzers and electrical panels. The precast concrete building reduced construction costs. The chemical feed pump discharge rate is automatically paced by the plant effluent chlorine residual and flow rate. The new control system significantly reduced the amount of sodium hypochlorite used by the Authority.

The internal mechanisms in Final Clarifier No. 3 & 4 were installed in 1986 and were deteriorated. The deteriorated internal mechanisms and walkways required replacement in order to keep the equipment operating in an efficient manner and to reduce maintenance costs. Failure of the existing internal mechanisms could have prevented the Authority from meeting their NJPDES permit requirements. The improvements project included removing the existing internal mechanisms and replacing with new equipment.

The existing concrete Chlorine Contact Tanks and Final Clarifier No. 1 & 2 were constructed in 1968 and Final Clarifier No. 3 & 4 were constructed in 1986. The concrete at each of these locations was repaired and coated to protect the surfaces from further deterioration. The existing surfaces included spalls, exposed aggregate and cracking.

On behalf of the Authority, CME Associates coordinated with the NJDEP for funding through the New Jersey Environmental Infrastructure Trust Fund. The project received principle forgiveness for a portion of the project costs through the American Recovery and Reinvestment Act (ARRA).