Abstract
Wastewater treatment plants using anaerobic digestion to stabilise and reduce pathogenic microorganisms produce large quantities of gas. This gas contains about 60% methane and 40% CO 2 . The digester gas can be used at the site for heat or power. In some cases the CO 2 is removed and the methane is sold as pipeline quality gas. A molten carbonate fuel cell, using the digester gas without CO 2 removal, has the potential to provide significant environmental and economic benefits. Engineering studies have shown the benefits of locating a 1 MW molten carbonate fuel cell at a wide variety of US sites. A demonstration plant is being developed with the participation of the US Environmental Protection Agency, King County Department of Natural Resources, Washington State Energy Office, M-C Power Corporation and Puget Sound Energy. The demonstration plant will verify the merits and applicability of MCFC technology throughout the US.
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