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ESTIMATING BIOAUGMENTATION EFFICACY OF TCE DECHLORINATION USING LONG-TERM FIELD WELL-TO-WELL TESTS IN A HIGHLY RECHARGED AND TCE-CONTAMINATED AQUIFER
Han, K., S. Park, U. Hong, Y. Yeum, S. Kwon and Y. Kim.
Journal of Environmental Science and Health, Part A 54(3): 208-218(2019)
A combined field method accurately assessed the extent of TCE reductive dechlorination activity and mass fraction of its byproducts was demonstrated. Soil column and field bioaugmentation tests were conducted to evaluate the method, which combined injecting a known concentration of 1,1,2-trichloro-2-fluoroethene (TCFE) as a TCE bio-surrogate and a forced mass balance (FMB) data processing technique that considers the sorption effect on the mass fraction of chloroethene. In the soil column test, the FMB resulted in a mass fraction of 6% TCE, 48.3% cis-1,2-dichloroethene, 18.5% vinyl chloride, and 27.2% ethylene. In the field bioaugmentation test, TCFE showed equivalent dechlorination pathways of TCE. The mass fractions estimated by FMB were very similar to those observed in the soil column bioaugmentation tests: 4.5% TCFE, 57.1% 1,2-dichloro-1-fluoroethene, 12% 1-chloro-1-fluoroethene and 26.4% fluoroethene. The FMB method gave ~50% higher mass fraction for more chlorinated ethenes and ~10% lower mass fraction of less chlorinated ethenes than those considering only the aqueous concentrations of chlorofluoroethenes.
Journal of Environmental Science and Health, Part A 54(3): 208-218(2019)
A combined field method accurately assessed the extent of TCE reductive dechlorination activity and mass fraction of its byproducts was demonstrated. Soil column and field bioaugmentation tests were conducted to evaluate the method, which combined injecting a known concentration of 1,1,2-trichloro-2-fluoroethene (TCFE) as a TCE bio-surrogate and a forced mass balance (FMB) data processing technique that considers the sorption effect on the mass fraction of chloroethene. In the soil column test, the FMB resulted in a mass fraction of 6% TCE, 48.3% cis-1,2-dichloroethene, 18.5% vinyl chloride, and 27.2% ethylene. In the field bioaugmentation test, TCFE showed equivalent dechlorination pathways of TCE. The mass fractions estimated by FMB were very similar to those observed in the soil column bioaugmentation tests: 4.5% TCFE, 57.1% 1,2-dichloro-1-fluoroethene, 12% 1-chloro-1-fluoroethene and 26.4% fluoroethene. The FMB method gave ~50% higher mass fraction for more chlorinated ethenes and ~10% lower mass fraction of less chlorinated ethenes than those considering only the aqueous concentrations of chlorofluoroethenes.
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