Simulated and experimental evaluation of factors affecting the rate and extent of reductive dehalogenation of chloroethenes with glucose

Journal of Contaminant Hydrology
Il-Su LeePerry L McCarty

Abstract

Carbohydrates such as molasses are being added to aquifers to serve as electron donors for reductive dehalogenation of chloroethenes. Glucose, as a model carbohydrate, was studied to better understand the processes involved and to evaluate the effectiveness for dehalogenation of different approaches for carbohydrate addition. A simulation model was developed and calibrated with experimental data for the reductive dehalogenation of tetrachloroethene to ethene via cis-1,2-dichloroethene. The model included fermentors that convert the primary donor (glucose) into butyrate, acetate and hydrogen, methanogens, and two separate dehalogenator groups. The dehalogenation groups use the hydrogen intermediate as an electron donor and the different haloethenes as electron acceptors through competitive inhibition. Model simulations suggest first that the initial relative population size of dehalogenators and H(2)-utilizing methanogens greatly affects the degree of dehalogenation achieved. Second, the growth and decay of biomass from soluble carbohydrate plays a significant role in reductive dehalogenation. Finally, the carbohydrate delivery strategies used (periodic versus batch addition and the time interval between periodic addition) great...Continue Reading

References

Jun 6, 1997·Science·P L McCarty

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Citations

Aug 23, 2011·Environmental Monitoring and Assessment·Tillman GreisAndreas Haarstrick
Feb 1, 2013·Environmental Science & Technology·Gretchen L W HeavnerRuth E Richardson
Oct 21, 2015·Journal of Contaminant Hydrology·Thomas J PhelanJohn A Christ
Aug 29, 2012·Biotechnology and Bioengineering·Julie C ChambonPhilip J Binning
Jun 24, 2006·Journal of Contaminant Hydrology·Cameron M Long, Robert C Borden
Feb 6, 2017·Applied and Environmental Microbiology·Xinwei MaoLisa Alvarez-Cohen
Dec 18, 2013·Environmental Science & Technology·Kirsten M Hiortdahl, Robert C Borden

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