Can 'biochar' save the planet? (Terra preta gets the CNN treatment)

[eppur_se_muova]

By Azadeh Ansari
CNN


ATHENS, Georgia (CNN) -- Over the railroad tracks, near Agriculture Drive on the University of Georgia campus, sits a unique machine that may hold one of the solutions to big environmental problems like energy, food production and even global climate change.

"This machine right here is our baby," said UGA research engineer Brian Bibens, who is one of a handful of researchers around the world working on alternative ways to recycle carbon.

Bibens' specialty is "biochar," a highly porous charcoal made from organic waste. The raw material can be any forest, agricultural or animal waste. Some examples are woodchips, corn husks, peanut shells, even chicken manure.

Bibens feeds the waste -- called "biomass" -- into an octagonally shaped metal barrel where it is cooked under intense heat, sometimes above 1,000 degrees Fahrenheit, the organic matter is cooked through a thermochemical process called "pyrolysis".

In a few hours, organic trash is transformed into charcoal-like pellets farmers can turn into fertilizer. Gasses given off during the process can be harnesed to fuel vehicles of power electric generators.
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more: http://www.cnn.com/2009/TECH/science/03/30/biochar.warming.energy/index.html