Plant Overview

The wastewater treatment facility was constructed in 1979-1980 and became operational in September 1980. The treatment facility was expanded in 1992 to increase the BOD5 treatment capacity with the addition of a biological filter ahead of the existing rotating biological contactor (RBC) process. A schematic diagram of the Village of Denmark wastewater treatment facility is shown below.

Preliminary treatment includes a rotary fine screen followed by grit removal. A single 40-foot diameter primary clarifier provides primary treatment. A biological filter that reduces the BOD concentration to less than 30 mg/l provides secondary biological treatment. Rotating biological contactors (RBC’s) follow the biological filter for nitrification of the wastewater to approximately 1 mg/l NH3-N. Two 30-foot diameter clarifiers provide final clarification followed by cascade aeration. Sludge treatment consists of a 40-foot diameter primary digester, a 40-foot secondary digester, and a 690,000 gallon mixed sludge storage tank for storage prior to land spreading.

The treatment system performance data for 2005 is shown on the chart to the right. The Land O’Lakes cheese plant contributes approximately 2,000 lbs/day BOD to the Denmark treatment facility and is included in the data.

Village of Denmark Water Utility »

Village Representatives
DNR - Gary Kincaid 662-5136
Village - Erika Sisel/Lew Miller

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