Program One
Wednesday, May 21, 1997

Remediation Kansa A



E.A. Betterton1, R.G. Arnold2, Z. Liu2, I. Diaz2, and G. Chen2, Departments of 1Atmospheric Studies and 2Chemical and Environmental Engineering, University of Arizona, Tucson, AZ 85721 Electrolytic reactors for the reductive dehalogenation of heavily halogenated environmental pollutants including carbon tetrachloride, trichloroethene, and perchloroethene in ground water are described.

Laboratory scale two-compartment, three-electrode batch and flow-through reactors, in which the potential on the working electrode (cathode) is fixed using a potentiostat, are used to optimize the performance of a pilot scale flow-through reactor that will soon be installed in the field.

Each reactor is capable of accelerating reductive dehalogenation reactions to very high rates under laboratory conditions. Typically, millimolar concentrations of aqueous-phase targets can be dehalogenated in minutes to hours. Depending on the nature of the cathode (iron, nickel, copper, etc.), the reductive dehalogenation can proceed through to the parent alkane in high yields.

Anode compartment oxidative dehalogenation reactions are also described.

The description of each system includes the proposed reaction mechanism, typical kinetic data, and a discussion of the feasibility of applying this technology for the in situ destruction of hazardous compounds.

Key words: electrolysis, dehalogenation, remediation, solvent, ground water

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Tuesday, May 20, 1997

Metals Kansa A

Remediation of Munitions Compounds Kansa B

Analytical Methods Kansa C/D

General Topics Kansa B

Wednesday, May 21, 1997

Metals Kansa A

Zero-Valent Metals Kansa A

Remediation Kansa A

Vegetation-based Remediation Kansa B

Partnerships & Innovative Technologies Kansa C/D

Nonaqueous Phase Liquids Kansa C/D

Thursday, May 22, 1997

Biofilms & Barriers Kansa A

Bioremediation Kansa B

Partnerships & Technology Innovations Kansa C/D

Remediation Kansa C/D


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