Trash Into Gas, Efficiently? An Army Test May Tell

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August 27, 2013

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by Paul Tullis (The New York Times) …But big drawbacks have prevented the wholesale adoption of trash-to-gas technology in the United States: incineration is polluting, and the capital costs of new plants are enormous. Gasification systems can expend a tremendous amount of energy to produce a tiny amount of electricity. Up to this point, it hasn’t seemed worth the trouble.

Mike Hart thinks that he has solved those problems. In a former Air Force hangar outside Sacramento, his company, Sierra Energy, has spent the last several years testing a waste-to-energy system called the FastOx Pathfinder. The centerpiece, a waste gasifier that’s about the size of a shower stall, is essentially a modified blast furnace. A chemical reaction inside the gasifier heats any kind of trash — whether banana peels, used syringes, old iPods, even raw sewage — to extreme temperatures without combustion. The output includes hydrogen and carbon monoxide, which together are known as syngas, for synthetic gas, and can be burned to generate electricity or made into ethanol or diesel fuel. The FastOx is now being prepared for delivery to Sierra Energy’s first customer: the United States Army.

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“California produces 30 million tons of garbage a year,” Mr. Hart said. “If it decided to turn its waste into clean fuels, at that rate it could meet all its oil consumption needs and still export more fuel than some OPEC members.” That is, if the FastOx can do what no other waste-to-energy gasification technology has done before: take any kind of trash, in any succession, without additional separation or preparation.

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Any waste-to-energy plan, however, must overcome a major hurdle: the wild inconsistency of the waste stream. “Until you’ve demonstrated that you can handle it all, nobody’s interested,” Mr. Hart said. “I can understand it; they’ve heard similar promises before. We’ve got 150 cities, communities and businesses lined up to be Serial No. 2. Nobody wants to be No. 1.” READ MORE and MORE (Scientific American)

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