Gas phase photocatalytic degradation on TiO(sub 2) pellets of volatile chlorinated organic compounds from a soil vapor extraction well.

摘要

The mineralization of trichloroethylene (TCE) and tetrachloroethylene (PCE) in gas stream from a soil vapor extraction (SVE) well was demonstrated with an annular photocatalytic reactor packed with porous TiO(sub 2) pellets in field trials at the Savannah River Site in Aiken, SC. The TiO(sub 2) pellets were prepared using a sol-gel method. The experiments were performed at 55 to 60(degree)C using space times of 10(sup 8) to 10(sup 10) g s/mol for TCE and PCE. Chloroform (CHCl(sub 3)) and carbon tetrachloride (CCl(sub 4)) were detected as minor products from side reactions. On a molar basis, CCl(sub 4) and CHCl(sub 3) produced were about 2% and 0.2 % of the reactants.