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Applied and Environmental Microbiology, June 1999, p. 2784-2788, Vol. 65, No. 6
0099-2240/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Optimization of Simultaneous Chemical and Biological Mineralization of Perchloroethylenedagger

Fatih Büyüksönmez,1 Thomas F. Hess,1,* Ronald L. Crawford,1 Andrzej Paszczynski,1 and Richard J. Watts2

Center for Hazardous Waste Remediation Research, University of Idaho, Moscow, Idaho 83844,1 and Department of Civil and Environmental Engineering, Washington State University, Pullman, Washington 991642

Received 20 October 1998/Accepted 10 March 1999

Optimization of the simultaneous chemical and biological mineralization of perchloroethylene (PCE) by modified Fenton's reagent and Xanthobacter flavus was investigated by using a central composite rotatable experimental design. Concentrations of PCE, hydrogen peroxide, and ferrous iron and the microbial cell number were set as variables. Percent mineralization of PCE to CO2 was investigated as a response. A second-order, quadratic response surface model was generated and fit the data adequately, with a correlation coefficient of 0.72. Analysis of the results showed that the PCE concentration had no significant effect within the tested boundaries of the model, while the other variables, hydrogen peroxide and iron concentrations and cell number, were significant at alpha  = 0.05 for the mineralization of PCE. The 14C radiotracer studies showed that the simultaneous chemical and biological reactions increased the extent of mineralization of PCE by more than 10% over stand-alone Fenton reactions.

* Corresponding author. Mailing address: Center for Hazardous Waste Remediation and Research, University of Idaho, Moscow, ID 83844-0904. Phone: (208) 885-7461. Fax: (208) 885-7908. E-mail: tfhess{at}uidaho.edu.

dagger Publication number 99301 of the Idaho Agricultural Experiment Station.

Applied and Environmental Microbiology, June 1999, p. 2784-2788, Vol. 65, No. 6
0099-2240/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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