The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 05, 1991
Filed:
Mar. 20, 1990
Applicant:
Inventors:
F Stephen Lupton, Evanston, IL (US);
Louis J DeFilippi, Mt. Prospect, IL (US);
James R Goodman, Chicago, IL (US);
Assignee:
Allied-Signal Inc., Morris Township, Morris County, NJ (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C22F / ;
U.S. Cl.
CPC ...
210611 ; 210631 ; 210720 ; 210724 ; 210913 ; 435262 ;
Abstract
A method of reducing soluble Cr(VI) levels in aqueous wastes from 200 ppm or more to less than 1 ppm, particularly to less than 0.05 ppm, preferably to less than 0.01 ppm, uses fermentative sulfate-reudcing anaerobic bacteria to reduce Cr(VI) to Cr(III) and immobilize the latter as the extememly insoluble hydroxide. The process is readily adapted to operate continuously using a bioreactor containing sludge with sulfate-reducing anaerobic bacteria and operated as a chemostat.