Collection System
The collection system is comprised of 5 lift station and about 22 miles of sanitary sewer main ranging in size from 6”-15” diameters. The city is responsible for maintaining the sewer mains with the use of its trailer mounted jetter unit as well as contracting out root cutting and cleaning services to maintain the integrity of the sewer system.
Treatment Plant Overview
The wastewater treatment plant currently has a design daily flow of .680 MGD with a daily maximum flow of 1.525 MGD. In 2016 the average daily flow was .526 MGD, which is discharged into the Oconto River. The existing treatment facility uses trickling filters as its main treatment unit. As the water enters the plant it enters and flows thru a fine mechanically cleaned bar screen and compactor, grit removal, clarigester, trickling filters, and a final clarifier with a solids contact unit. Before the water enters the Oconto River, it flows thru a seasonal (May 1st-September 31st) disinfection system. This disinfection is achieved with the use of UV disinfection system. Phosphorus treatment is accomplished with the aid of ferric chloride addition in the final clarifier. Solids are treated in the anaerobic digestion unit of the clarigester. Excess solids produced within the digester are pumped into the sludge storage tank, where they are then spread onto DNR approved agricultural lands.