Liquid purification or separation – Processes – Treatment by living organism
Reexamination Certificate
2009-02-27
2009-10-20
Barry, Chester T (Department: 1797)
Liquid purification or separation
Processes
Treatment by living organism
C210S630000, C210S192000, C210S916000
Reexamination Certificate
active
07604741
ABSTRACT:
An apparatus and method produces nitrate ions on-site from water, natural gas and air extracted in proximity to the apparatus. The apparatus generates nitrate ions and brings the nitrate ions into contact with an aqueous system. Hydrogen sulfide present in the aqueous system is removed and the production of hydrogen sulfide by sulfate-reducing bacteria (SRB) is eliminated by introducing into the system nitrate ions, whereby denitrifying microorganisms, using nitrate, outcompete the sulfate-reducing bacteria for the available carbon nutrients, thus preventing the SRB from producing hydrogen sulfide. Nitrate ions generated by the apparatus and added to the aqueous system which contains the denitrifying microorganisms can enhance oil recovery by means of microbial enhanced oil recovery mechanisms.
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Dennis D. Michael
Hitzman Donald O.
Iiams Bruce Alan
Barry Chester T
Bent Stephen A.
Foley & Lardner LLP
The Lata Group Inc.
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