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Enhanced Solar Drying in the Midwest – Carmel, Indiana

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The City of Carmel, Indiana, located minutes north of Indianapolis, Indiana, began operation of the Nation's first municipal BioPasteurization process in 2005 to achieve a Class A biosolid. A local soil blender began to haul the product; however, they had trouble handling the 24% Class A biosolids generated by the centrifuge.

Excess digester gas was available for drying after the BioPasteurization and the digestion processes.

Enhanced solar drying with supplemental heat was selected based on its simplicity, use of the digester gas, a 50,000 energy grant award, and the “green” component of the project. The process selected was Thermo-System by Parkson Corporation.

The drying process was initially enhanced by utilizing an enclosed greenhouse-style building, exhaust and circulation fans, temperature, and weather monitoring, and a PLC-based control to maintain optimum drying conditions. An electric “mole” moves randomly to mix the biosolids for further moisture release.

Supplemental heat provides additional drying enhancement to the system. The supplemental heat is generated from the excess digester gas.

Keywords: BioPasterization; Solar drying; mole; supplement heat

Document Type: Research Article


Publication date: 2009-01-01

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