Treatment of tetrachloroethylene with anaerobic attached film process
- Cornell Univ., Ithaca, NY (United States). Dept. of Agriculture and Biological Engineering
A laboratory-scale continuously fed anaerobic attached film expanded bed (AAFEB) reactor is utilized to examine the feasibility of tetrachloroethylene/trichloroethylene (PCE/TCE) dechlorination under methanogenic conditions at 35 C. Sucrose is used as the electron donor. After a short acclimation period, the system shows excellent dechlorination capability for treating PCE and TCE. Influent PCE concentration of 8.2-26 mg/L are reduced to less than 0.2 mg/L in most cases, even though efforts are made to achieve intermediate removal efficiencies to support kinetic analysis. TCE and cis-1,2-dichloroethylene (cis-1,2-DCE) remain at low concentrations, which indicates that they were not the rate-limiting intermediates throughout much of the test program. Preliminary estimates of the half-velocity coefficient (K[sub s]) and maximum PCE uptake rate (q[sub max]) are 0.25-mg PCE per liter and 22.9-mg PCE per gram VS-per day, respectively. Most of the PCE and TCE appear to be converted to vinyl chloride. The cometabolism-like reactions require a minimum of about eight mass units of COD reduction for each mass of PCE dechlorinated with a range of less than five to greater than 10. The results of the study suggest that the AAFEB system with sucrose as carbon and energy source is efficient and rapid enough to appear to be a feasible bioremediation process for PCE and TCE treatment, but further treatment of vinyl chloride is necessary.
- OSTI ID:
- 5081595
- Journal Information:
- Journal of Environmental Engineering (New York); (United States), Vol. 120:1; ISSN 0733-9372
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
CHLORINATED ALIPHATIC HYDROCARBONS
BIODEGRADATION
GROUND WATER
DECONTAMINATION
METHANOGENIC BACTERIA
REMEDIAL ACTION
TECHNOLOGY ASSESSMENT
BACTERIA
CHEMICAL REACTIONS
CLEANING
DECOMPOSITION
HALOGENATED ALIPHATIC HYDROCARBONS
HYDROGEN COMPOUNDS
MICROORGANISMS
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
OXYGEN COMPOUNDS
WATER
540220* - Environment
Terrestrial- Chemicals Monitoring & Transport- (1990-)
560300 - Chemicals Metabolism & Toxicology