Summit County, Ohio
The County of Summit Department of Environmental Services owns and operates the Upper Tuscarawas Wastewater Treatment Plant (WWTP) #36 which was originally constructed in 1978. The plant capacity is 4.0 MGD average day design and the actual average day flow is approximately 3.0 MGD. The wet stream process consist of a manual bar rack, grit removal, primary settling tanks, rotating biological contractors, final clarification, tertiary treatment with rapid sand filters, post aeration, UV disinfection and phosphorus removal using ferric chloride. Solid stream processes include primary and secondary sludge pumping to aerobic digesters for stabilization and dewatering with two belt filter presses.
CT evaluated the feasibility of constructing MBR activated sludge in lieu of other selector processes to meet future phosphorus and nutrient requirements. Various unit processes were evaluated including upgrading the existing RBC’s. The study concluded that MBR is the selected process in the future.
Other immediate improvements were identified for immediate implementation to ease operations, improve maintenance and replace deteriorating equipment. Future improvements to convert to an MBR activated sludge process were phased and implementation was stipulated based on project flows as development begins to occur again. A summary improvements includes:
- Upgrade of fine screening to remove rags and debris at the head of the plant.
Addition of an outlet and channel from each primary clarifier to improvement hydraulics.
- Complete demolition and replacement of both tertiary filters.
- Extending the aerobic digester waste line from its current termination point at the grit building effluent channel to the wet well at influent pump station #1.
- Recoat the underwater surfaces of the primary clarifier as well as any exposed metals with a protective coating system.
- Demolish and replace the roofs on the belt press and Rotating Biological Contactor (RBC) buildings.
- Replacement of two RBC’s.
- Demolition and replacement of the existing Motor Control Centers (MCC) with appurtenances for the four aerobic digester blowers.
- Repair roadways and park