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Bioremediation of low-permeability, pentachlorophenol-contaminated soil by laboratory and full-scale processes

Ex-situ bioremediation of saturated soil contaminated with pentachlorophenol and
2,3,5,6-TeCP is commonly accomplished by landfarming or by treatment in a bioreactor.
Treating saturated, low-permeability soils in bioreactors, without pre-treatment requires a
reactor capable of promoting anaerobic and/or aerobic removal of chlorophenols without
transferring these contaminants to the aqueous phase. A pilot-scale bioreactor was
designed to treat 3.7 cubic meters of contaminated soil with a saturated hydraulic
conductivity of 0.12 cm/day. The bioreactor demonstrated significant removal of
chlorophenols when soil was infused with a treatment mixture containing imitation vanilla
flavoring as an electron donor for reductive dechlorination and primary substrate for
aerobic cometabolism. Bench scale studies showed greater overall removal when feed
mixtures included an inoculated biomass, or when treatment mixtures were maintained
anaerobically prior to use. The combined results of these studies suggest that
concentrations of pentachlorophenol and 2,3,5,6-TeCP in soil can be significantly reduced
using fill and draw batch reactors, operated for three to five week long cycles, using a
variety of treatment mixtures. / Graduation date: 1998
Date30 January 1998
CreatorsHavighorst, Mark B.
ContributorsWoods, Sandra L.
Source SetsOregon State University
Detected LanguageEnglish

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