Wastewater

Wastewater

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{5CE41DE1-86A2-4959-B588-E68EB8153D20}In Medford, as in most cities, a large percentage of used water moves from homes, businesses, institutions and industries via a sanitary sewer system to a central point-the wastewater treatment facility. The purpose of the wastewater treatment facility is to remove the wastes from the water prior to discharging the flow into the Black River. In essence, we must purify the wastewater to protect the waterways for public and private uses down stream of the facility.

The removal of wastes is accomplished through physical, biological, and chemical means, resulting in a treated effluent. Wastewater sludge, which is the solids by-product of the biological process, is applied to agricultural land as a nutrient supplement.

The Medford Wastewater Treatment plant is designed to treat a flow of 1.45 million gallons per day (mgd) (receiving an average of 1.01 mgd), while serving a population of nearly 4,400. Approximately 27% of the flow originates from industrial sources. The plant does an exceptional job of pollutant removal, consistently removing more than 99% of the biochemical oxygen demand, suspended solids, and ammonia from the incoming wastewater. Major treatment processes include preliminary treatment, activated sludge biological treatment, final clarification, tertiary filtration, seasonal chlorination and dechlorination, and cascade aeration prior to discharge to the Black River. Sludge is aerobically digested, dewatered in a belt press, and land-applied.

The last major plant renovation was completed in 1988. A chlorination and dechlorination building was added in 1990 and ferric chloride phosphorus removal was added in 1999.

In 1997 the plant received a Region 5 United States Environmental Protection Agency Operation and Maintenance (O&M) Award for having the best-operated wastewater treatment facility in the Medium Advanced Category for 1997. Medford was one of six communities to receive Regional O&M Awards that year. This award is based on the following achievements: (1) an excellent permit compliance record during the past two years; (2) precise process control, which has decreased sludge production and includes microscopic examination of the biological process; (3) reduction in operating costs of the lift stations, by installing larger pumps and making other modifications; (4) an outstanding laboratory program, which has been recognized for excellence by the WDNR; and (5) utilization of a small, highly competent staff to run the facility.

© 2018 City of Medford 639 S. Second Street, Medford, WI 54451- (715) 748-4321

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