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Grease Digestion to Increase Digester Gas Production – 4 Years of Operation

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The City of Watsonville has been operating a grease digestion system since January 2003 to increase their digester gas production. The system accepts grease deliveries from restaurant grease trap haulers, stores the grease in an 11,000 gallon tank, and feeds the grease to an anaerobic digester. The increase in digester gas production offsets the purchase of natural gas. The historic operating data is presented including grease loads, digester gas production, natural gas savings, and tipping fees. Improvements to the system that have been made as well as lessons learned are presented.
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Keywords: DIGESTER GAS; ENERGY SAVINGS; GREASE DIGESTION

Document Type: Research Article

Publication date: 2007-10-01

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