hazardous wastes. I found an article about its use for household
waste. You can find the article at Scientific American's website at
Here is an extract of that article:
'Every year 130 million tons of America's trash ends up in landfills.
Together the dumps emit more of the greenhouse gas methane than any
other human-related source. But thanks to plasma technology, one
city's rotting rubbish will soon release far less methane—and provide
power for 50,000 homes—because of an innovation in plasma technology
backed by Atlanta-based Geoplasma.
Engineers have developed an efficient torch for blasting garbage with
a stream of
superheated gas, known as plasma. When trash is dropped into a chamber
and heated
to 10,000 degrees Fahrenheit, its organic components—food, fluids,
paper—vaporize into a hot, pressurized gas, which turns a turbine to
generate electricity. Steam, a by-product, can generate more.
Inorganic refuse such as metals condense at the bottom and can be used
in roadbeds and heavy construction.
Several small plasma plants exist around the world for industrial
processes, but Geoplasma is constructing the first U.S. plasma refuse
plant in St. Lucie County, Florida. The plant is scheduled to go
online by 2011; it will process 1,500 tons of garbage a day, sending
60 megawatts of electricity to the power grid (after using some to
power itself).
Emissions are far lower than in standard incineration, and the process
reduces landfill volume and methane release. Power prices are
projected to be on par with electricity from natural gas. The
difference, says Ron Roberts, St. Lucie County's assistant director of
solid waste, is that "you're getting rid of a problem and making it a
positive." '
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