The City of New Philadelphia's Wastewater Treatment Plant is an activated sludge type secondary treatment with disinfection, sludge handling, and dewatering. It is designed for a 90% to 95% removal of raw organic material and suspended solids. It accepts a normal sewage influent. The plant is designed for an average flow of 4.5 million gallons per day, with a peak hydraulic flow of 10.5 million gallons through all of the facilities with any single unit out of service.
The results of the operation of the treatment plant must satisfy the effluent limitations set for the plant in accordance with the National Pollutant Discharge Permit issued by the Ohio EPA.
Sewage entering the facility comes via the sewer collection system for the City of New Philadelphia, which consists of several miles of gravity sewers, mostly vitrified clay pipe sewers of 8" to 30" diameter. The gravity system is supported by 14 lift stations and force mains which serve low-lying and isolated areas. These lift stations range in pumping capacity from 30 gallons per minute to 600 gallons per minute.
The sanitary system is a totally separate and stand-alone system. A storm sewer system is in place to serve the entire city for surface run-off and other waters not requiring sewage treatment.