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What's Happening from BuildingGreen.com
December 30, 2008
Coal Ash in Spill Could Not Have Been Used in Concrete
The ash from the Tennessee Valley Authority’s (TVA) Kingston Fossil Plant that is now endangering the local community following a December 22 breach in a holding pond is most likely an 80/20 mix of fly ash (from smokestack pollution control systems) and bottom ash. To be used in concrete, fly ash must be low in residual carbon, as defined by ASTM Standard C 618. The boilers at the Kingston plant run at relatively low temperatures to reduce emissions of nitrogen oxides. A side effect of this lower temperature is that the coal is not burned as completely and the ash retains more carbon....
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