Schwing Bioset has completed start-up of a new Bioset Class A lime stabilization system at the West Central Wisconsin Biosolids Facility (WCWBF) located in Ellsworth, WI. The WCWBF serves as a regional facility for more than ten local communities offering strictly dewatering and residuals management services.
The WCWBF had an existing Class A lime system that mixed biosolids with lime and fly ash. That system was plagued by continual mechanical failures and extreme dust and odor issues for nearly the entire 10-year span it was in operation.
The WCWBF hired Town & Country Engineers of Madison, WI to review available Class A technologies and evaluate the proposals received from the short-listed vendors. After studying other Class A technologies and touring other available alkaline stabilization systems (including another technology that utilizes supplemental heat) only two proposals were solicited – a replacement of the existing system, or a Bioset system from Schwing Bioset.
The WCWBF selected the Bioset process because it offered a lower cost proposal that also:
- Greatly reduced the volume of Class A material produced
- Contained dust and minimized odors in the enclosed vessel
- Provided a consistent Class A material
- Produced a material that was free of the metal contaminants that are present in fly ash additives.
As the WCWBF has no significant up-stream storage capacity the new equipment needed to be installed and operational within one week. Schwing Bioset met this need by providing the installation and commission services with its own installation crew.
The facility is already reaping the benefits of the improved Class A product as a revenue stream. Historically the WCWBF had to pay local Contractors to have the other material removed. Now, Contractors are paying the WCWBF for the Bioset material which is being used as a substitute for agricultural lime and fertilizer.