Accession Number : ADA320511

Title :   Sequential Transformation of Carbon Tetrachloride, Perchloroethylene, and 1,1, 1-Trichloroethane Using Methanogenic and Methanotrophic Conditions.

Descriptive Note : Master's thesis,

Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH

Personal Author(s) : Christ, Sarah J.

PDF Url : ADA320511

Report Date : 09 JAN 1997

Pagination or Media Count : 68

Abstract : A methanogenic-methanotrophic system has been established to assess the capability of sequential treatment to transform the chlorinated aliphatics perchloroethylene (PCE), carbon tetrachloride (CT) and 1,1,1-trichloroethane (1,1,1-TCA). Experiments compared the transformation of PCE alone and in a mixture of the target compounds. A comparison of acetate and iron as electron donors was also made. Data from the anaerobic systems have shown that PCE transformation is inhibited when in a mixture with CT and 1,1,1-TCA compared to when it is fed alone. When iron is the electron donor, PCE and 1,1,1-TCA are transformed without an acclimation period. CT was completely transformed regardless of the electron donor used. The acetate-fed system required approximately 60 days to acclimate to 1,1,1-TCA and 70 days for acclimation to PCE. Although the sequential system has been constructed, sampling from the aerobic column was not done before the thesis project ended. More investigation is required to determine the ability of the sequential system to degrade PCE, CT, and 1,1,1-TCA.

Descriptors :   *TRICHLOROETHANES, *CARBON TETRACHLORIDE, COMPARISON, THESES, SEQUENCES, IRON, SAMPLING, ELECTRON DONORS, AEROBIC PROCESSES, ACETATES, TRANSFORMATIONS, CHEMICAL COMPOUNDS, TRICHLOROETHYLENE, ANAEROBIC PROCESSES, ACCLIMATIZATION.

Subject Categories : Organic Chemistry
      Physical Chemistry
      Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE