Effect of sub and super CXC levels of surfactant concentrations on the dechlorination of 2{prime},3,4-trichlorobiphenyl
- Michigan State Univ., East Lansing, MI (United States). Dept. of Crop and Soil Sciences
The anaerobic dechlorination of 2{prime},3,4-trichlorobiphenyl (TCB) was investigated in the presence of 7 different surfactants. Dechlorination assays were performed in anaerobic slurries of non-contaminated sediment inoculated with a PCB-dechlorinating microbial consortium extracted from upper Hudson-River sediments. The surfactants used in this study were: Alfonic 810-60, Dowfax 8390 (C16 DPDS), Triton X-100, Triton X-405, Triton X-705, Tween 80, and Petroleum sulfonate. Each surfactant was tested at 3 concentrations: 5%, 25%, and 110% of the CMC except petroleum sulfonate which does not have a CMC. It was used at 5 ppm and 10 ppm. CMCs are as follow: Alfonic 810-60, 275 ppm; Dowfax 8390 (CI6 DPDS), 4,000 ppm; Triton X-100, 130 ppm; Triton X-405, 620 ppm; Triton X-705, 1,250 ppm; and Tween 80, 1 3 ppm. After 10 weeks of incubation, the extent of dechlorination varied among the surfactants and among different concentrations of the same surfactant. Dowfax.8390 inhibited the dechlorination of 2{prime},3,4-TCB at all concentrations tested. Alfonic 810-60 and some of the Triton X group of surfactants inhibited the dechlorination at 25% and 110% of the CMC level, but dechlorination occurred at the 5% level; however, the extent of dechlorination was dependent on the type of surfactant. Dechlorination was observed in the presence of 5 ppm petroleum sulfonate but not at higher concentrations. Dechlorination was not inhibited at any of the concentrations of Tween 80 and was promoted in some slurries. Tween 80 appears to be a promising surfactant for use in bioremediation.
- OSTI ID:
- 31777
- Report Number(s):
- CONF-9410273--
- Country of Publication:
- United States
- Language:
- English
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