Completing the Circle: Create Biosolids, Use the Biogas to Dry Them

A Central Wisconsin utility abandoned its combined heat and power system in favor of a more cost-effective use for methane from its anaerobic digesters

Completing the Circle: Create Biosolids, Use the Biogas to Dry Them

The Vapor Power thermal oil heater for drying biosolids is fueled by biogas, supplemented by natural gas when needed.

The Stevens Point Water Department decommissioned the combined heat and power system at its wastewater treatment plant and redirected the biogas to drying biosolids.

The result was a significant operating cost reduction. The utility, in Central Wisconsin, received the 2021...

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