Liquid purification or separation – Processes – Treatment by living organism
Patent
1992-05-04
1994-01-11
Upton, Christopher
Liquid purification or separation
Processes
Treatment by living organism
210610, 210614, 210747, 210901, 210908, C02F 330
Patent
active
052778150
ABSTRACT:
Regulated processes for biodegrading halogenated organic compounds in an aqueous subsurface environment through stimulation of bacteria are provided. The processes provide an electron donor source to anaerobic dehalogenating bacteria as a stimulus for biodegradation of the contaminants. When necessary to limit the biological formation of vinyl halide monomer, the processes provide for a sulfate reducing environment in the region of biological activity by the addition of an inorganic sulfate. One embodiment provides for converting the aqueous subsurface environment from anaerobic dehalogenating conditions to aerobic conditions. Another embodiment provides for converting the aqueous subsurface environment from anaerobic dehalogenating conditions to anaerobic methanogenic conditions followed by conversion to aerobic conditions in order to completely degrade the contaminants to carbon dioxide and water.
REFERENCES:
patent: 3846290 (1974-11-01), Raymond
patent: 4401569 (1983-08-01), Shiveri et al.
patent: 4588506 (1986-05-01), Raymond et al.
patent: 4664805 (1987-05-01), Focht
patent: 4713343 (1987-12-01), Wilson, Jr. et al.
patent: 4749491 (1988-06-01), Lawes et al.
patent: 4755304 (1988-07-01), Hallberg et al.
patent: 4761376 (1988-08-01), Kulpa
patent: 4925802 (1990-03-01), Nelson et al.
patent: 4954258 (1990-09-01), Little
patent: 5006250 (1991-04-01), Roberts et al.
patent: 5083611 (1992-01-01), Clark et al.
Anaerobic Biotransformations of Pollutant Chemicals in Aquifers by Suflita, Gibson, and Seeman, Journal of Microbiology, 3 (1988), pp. 179-194.
Stimulation of Reductive Dechlorination of Tetrachloroethene (PCE) in Anaerobic Aquifer Microcosms by Addition of Short-Chain Organic Acids, Alcohols, Sugars or Aromatic Compounds, Susan A. Gibson, Guy W. Sewell, ManTEch Environmental Technology, Inc. and U.S. Environmental Protection Agency, Robert S. Kerr Environmental Research Laboratory, Ada, OK. 74820.
Biological Reductive Dechlorination of Tetrachloroethylene and Trichloroethylene to Ethylene Under Methanorgenic Conditions by Freedman and Gossett Applied and Environmental Microbiology, Sep. 1989, pp. 2144-2151.
Stimulation of the Reductive Dechlorination of Tetrachloroethene in Anaerobic Aquifer Microcosms by the Addition of Toluene by Sewell and Gibson, Environmental Science & Technology, vol. 25, 1991.
Transformation of Halogenated Aliphatic Compounds by Vogel, Criddle and McCarty, Environmental Science Technology, vol. 21, No. 8, 1987, pp. 722-736.
Tetrachloroethylene as Electron Acceptor for the Anaerobic Degradation of Benzoate, by Scholz-Muramatsu, Szewzyk, Szewzyk, and Gaiser, FEMS Microbiology Letters 66, (1990), pp. 81-86.
Biotransformations of Selected Alkylbenzenes and halogenated Aliphatic Hydrocarbons in Methanogenic Aquifer Material: A Microcosm Study by Wilson, Smith & Rees, Chemical Abstracts, vol. 105, 1986, p. 338.
E. I. Du Pont de Nemours and Company
Hall William D.
Upton Christopher
LandOfFree
In situ biodegradation of groundwater contaminants does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with In situ biodegradation of groundwater contaminants, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and In situ biodegradation of groundwater contaminants will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1628962