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Main Title Chromate Reduction and Remediation Utilizing the Thermodynamic Instability of Zero-Valence State Iron.
Author Powell, R. M. ; Puls, R. W. ; Paul., C. J. ;
CORP Author ManTech Environmental Technology, Inc., Ada, OK.;Robert S. Kerr Environmental Research Lab., Ada, OK.
Publisher c1994
Year Published 1994
Report Number EPA-68-C3-0322; EPA/600/A-94/070;
Stock Number PB94-163516
Additional Subjects Water pollution ; Metals ; Oxidation reduction reactions ; Reaction kinetics ; Ground water ; Thermodynamic properties ; Chromates ; Iron ; Inorganic compounds ; Technology innovation ; Chemical reactors ; Columns(Process engineering) ; Toxic substances ; Reprint ; Site Remediation Technology ; SBR(Stirred Batch Reactors) ; Zero-valent iron
Library Call Number Additional Info Location Last
NTIS  PB94-163516 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 14p
The study examines the reaction kinetics for redox potential change and chromate reduction in stirred batch reactor systems (SBRs) containing a simulated groundwater in the presence and absence of natural aquifer material, using iron filings as the zero-oxidation state chemical. Column experiments were also utilized to evaluate reductive capacity and the potential for chromate breakthrough. Continuous tracking of the system chemistry, including redox potential, pH, and the concentrations of the chemical species of interest was performed for both types of experiments. Mathematical evaluations of the rates of changes in the SBRs were performed to determine the pseudo-reaction orders with respect to the electron, (measured as redox, or Eh) and chromate, as well as the reaction rates. Results indicate rapid changes in Eh from positive to highly negative values upon introduction of Fe metal to these systems, both in the presence and absence of aquifer material. (Copyright (c) Water Environment Federation 1994.)