Monday 4:00 PM
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Room: Diamond

Class A Biosolids Produced with Closed Alkaline Process

Alkaline Stabilization offers a cost-effective means for Publicly Owned Treatment Works (POTWs) to achieve USEPA Class A rating for beneficial reuse of Biosolids. Conventional lime stabilization technologies yield negative feedback from fugitive dust emissions and generated odor. A closed alkaline stabilization process offers a means to address these conditions. The Bioset Process blends Quicklime and Biosolids in a sealed system to prevent egress of lime dust. The blended biosolids are pumped through a pressurized reactor where the exothermic lime hydration reaction heats the biosolids. Pathogen reduction results from three primary stressors: high pH, high temperature, and miscible ammonia contact. The pressurized reactor also provides odor containment and evolved odors may be captured at discrete discharge location(s). This paper will survey selected POTWs that have employed the Bioset Process as a primary or secondary means to treat biosolids.

Moderator:  Lou Kollias


Chuck Wanstrom - Schwing Bioset, Inc.

Mr. Wanstrom, age 41, holds a Bachelor of Science degree in Civil Engineering from the University of Minnesota’s Institute of Technology.  Starting his career with the MN Department of Transportation Mr. Wanstrom joined the engineering department of Schwing America in 1995.  He moved into sales in 1998 as the Western Regional Sales Manager in the Environmental Division until 2002 when he was appointed the National Sales Manager of that group until it was spun out in 2006 as Schwing Bioset.  He has been the National Sales Manager of Schwing Bioset since its inception and now holds several patents in the wastewater field.  In addition to his duties in North America, Mr. Wanstrom has been instrumental in developing the markets for Schwing Bioset’s products in Asia, South America and Europe.