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BigV, I was involved with a project in Colorado that did just that. The digester produced a gas that was used to run two gensets: one used a modified diesel engine and the other used a Capstone microturbine. (I think they added a Stirling engine later.) There was a lot of sulfur in the gas, because of which the MT had to have lots of expensive gas cleanup equipment. The diesel engine just required frequent oil changes.
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