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:
Dec. 14, 1993
Filed:
Nov. 10, 1992
Kerry L Sublette, Tulsa, OK (US);
Badri N Dasu, Sunnyvale, CA (US);
ABB Environmental Services Inc., Portland, ME (US);
Abstract
A biological process is described involving the conversion of SO.sub.2 to H.sub.2 S using sulfate reducing bacteria in co-culture with facultatively anaerobic heterotrophs under anaerobic conditions in a maintenance medium which includes a substrate fermentable by the facultatively anaerobic heterotrophs to produce an end product which acts as the carbon and energy source for the sulfate reducing bacteria. Glucose and sewage sludge are the two fermentable substrates described. The process is described as being used in conjunction with a process for removing SO.sub.2 from a flue gas and then converting the SO.sub.2 to H.sub.2 S. The H.sub.2 S may be reacted with some remaining SO.sub.2 in a Claus reactor to produce elemental sulfur or the H.sub.2 S may be used as a reducing gas to regenerate the sorbent being used to remove the SO.sub.2 from the flue gas.