Laboratory flow-through column tests have been performed to evaluate the degradation of TCE by dithionite-treated sediment. These tests involved packing sand-sized samples obtained from the Hanford formation into columns and reducing the iron fraction of the sediment with a pH-buffered dithionite solution. TCE solutions were subsequently pumped through columns at various flow rates and the effluent analyzed for TCE and byproducts. Column experimental data collected to date indicate reduction of TCE can be approximated as a pseudo-first-order reaction with half-life values ranging from 19 to 66 hours. Analysis of column effluent samples indicates that most of the TCE is converted to acetylene, though minor amounts of ethylene and chloroacetylene were also observed.
Revised: September 18, 2002 |
Published: December 1, 1998
Citation
Thornton E.C., J.E. Szecsody, K.J. Cantrell, C.J. Thompson, J.C. Evans, J.S. Fruchter, and A.V. Mitroshkov. 1998.Reductive Dechlorination of TCE by Dithionite-Treated Sediment. In Physical, Chemical and Thermal Technologies: Remediation of Chlorinated and Recalcitrant Compounds, edited by G.B. Wickramanayake and R.E. Hinchee, 335-340. Columbus, Ohio:Battelle Press.PNNL-SA-29835.