Tuesday, December 22, 2009

WCI #12: The power of garbage

Scientific American says: "Trash is loaded with energy trapped in its chemical bonds. Plasma gasification, a technique that has been in development for decades, could finally be ready to extract it."

Apparently, it's pretty darn easy. Electricity is shot through a gas, which can be simply be ordinary air, and creates plasma. Plasma is superheated ionized gas that can reach temperatures of 7,000 degrees Celsius, hotter than the sun's surface. This is essentially what lightning is, and what researchers are doing is creating lightning in a bottle.

The plasma dissociates the molecular bonds in trash contained in the chamber and organic compounds become something called syngas (CO and hydrodren), the detritus of which is called slag.

The syngas can be used as fuel in a turbine to create electricity or used to create ethanol. The slag can be used for building material, something already being done in France and Japan. Although there are heavy metals in slag, the toxicity passes EPA standards but give pause to communities that may host such a plant.

But every ton of trash processes with plasma reduces the amount of CO2 in the atmosphere by two tons less than coal.

Creating energy by eradicating land fills.

What's not to like?

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