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Many municipalities are currently exploring options for upgrading existing conventional anaerobic digestion systems to produce Class A biosolids. Pasteurization of the biosolids prior to digestion is an EPA approved Class A process and can be achieved via simple retrofit. During the pre-pasteurization process, the biosolids temperature is elevated for a short period of time to meet Class A pathogen reduction requirements prior to volatile solids reduction in an anaerobic digestion system. The most important piece of equipment in pre-pasteurization systems is the heat exchanger. The focus of this paper will be on the evolution of Danish biosolids heat exchanger technology as used in pre-pasteurization systems.

Document Type: Research Article


Publication date: 2003-01-01

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  • Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed.

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