Venturi System Improves Effluent at Ohio WWTP

Problem: The Sidney (Ohio) Wastewater Treatment Plant receives substantial industrial wastewater. To meet current and future needs and protect the Great Miami River, the city undertook an upgrade to increase capacity to 7.5 mgd design and 14 mgd peak, along with conversion from chlorine to UV disinfection. The plant must maintain at least 6 mg/L dissolved oxygen in the effluent. However, the UV system eliminated the pressure head needed for the cascade aeration system. Solution: The Hazen design firm recommended a venturi aeration system from Mazzei Injector Company. The system uses a pump to recirculate water through a venturi injector, creating