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Columbus Water Works (CWW - Columbus, GA) is developing a new equivalent process to further reduce pathogens (Class-A sludge treatment process or PFRP) called Columbus Biosolids Flow-Through Thermophilic Treatment (CBFT3) as a very cost-effective means to retrofit an existing treatment plant with anaerobic digesters. The project will be demonstrated at the South Columbus Water Resource Facility (SCWRF). As an added enhancement to the digestion operation, this project is also looking to optimize the use of the produced digester gas for generation of combined heat and power (CHP or “cogeneration").

This project will use never-before-used-with-digester-gas advanced reciprocating engine systems (ARES). These new engines offer greatly increased efficiency with very low emissions. This paper will also address the following innovations that could have wide applicability in digestion systems across the country, as follows:

Directing 100% of produced digester gas to power generation.

Heating the digestion process to thermophilic temperatures using heat recovered from power generation as the primary heating source. Heat will also be recovered from cooling the digested thermophilic sludge to preheat the raw sludge feedstock.

Gas treatment to remove water, siloxanes, hydrogen sulfide and particulates to levels required by all present day digester gas use equipment, including the high-tech ARES systems.
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Document Type: Research Article

Publication date: 2006-01-01

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