February 15, 2011

PLASMATICS:

Turning garbage into gas: Atomising trash eliminates the need to dump it, and generates useful power too (The Economist, Feb 3rd 2011)

For years, some particularly toxic types of waste, such as the sludge from oil refineries, have been destroyed with artificial lightning from electric plasma torches—devices that heat matter to a temperature higher than that of the sun’s surface. Until recently this has been an expensive process, costing as much as $2,000 per tonne of waste, according to SRL Plasma, an Australian firm that has manufactured torches for 13 of the roughly two dozen plants around the world that work this way.

Now, though, costs are coming down. Moreover, it has occurred to people such as Dr Hillestad that the process could be used to generate power as well as consuming it. Appropriately tweaked, the destruction of organic materials (including paper and plastics) by plasma torches produces a mixture of carbon monoxide and hydrogen called syngas. That, in turn, can be burned to generate electricity. Add in the value of the tipping fees that do not have to be paid if rubbish is simply vaporised, plus the fact that energy prices in general are rising, and plasma torches start to look like a plausible alternative to burial.

The technology has got better, too.

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Posted by Orrin Judd at February 15, 2011 6:04 AM
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