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is needed. A WWTF in North Carolina44 indicated that 63 to 66 percent of available digester gas can be beneficially used with CHP, whereas use of digester gas-fueled boilers would consume only 33 to 38 percent of the gas, with the balance either stack losses or flared gas. This experience is consistent with the interviews of WWTFs conducted for this report, in which a number of facilities indicated that using CHP results in more beneficial use of the digester gas. For example, the Town of Lewiston, NY, indicated that prior to implementing CHP, its boiler used only 40 to 50 percent of the gas, whereas with the CHP system, gas utilization reached 98 percent. Future trends45 also indicate that more facilities are likely to build gas storage into their digester system, which should result in improved gas utilization. Storing digester gas during periods of low demand and drawing from storage when demand for heat is high minimizes the need for gas flaring. For many WWTFs, improving gas utilization while at the same time eliminating or minimizing flaring is a key driver for implementing CHP. 44 Fishman, Bullard, Vogt and Lundin, “Beneficial Use of Digester Gas – Seasonal and Lifecycle Cost Considerations,” 2009. 45 Based on a number of recent installations and feasibility studies that included gas storage (City of Riverside, CA; Cape Fear, NC; Ithaca, NY; Rochester NY; and Gloversville-Johnstown, NY). 44PDF Image | Combined Heat and Power at Wastewater Treatment Facilities
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