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. 02, 2003
Filed:
Dec. 26, 2001
Applicant:
Inventors:
Renate Ruitenberg, Sneek, NL;
Cees Jan Nico Buisman, Harich, NL;
Assignee:
Paques Bio Systems B.V., Balk, NL;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C12S 1/300 ;
U.S. Cl.
CPC ...
C12S 1/300 ;
Abstract
The invention provides a process for removing and immobilizing arsenic from an arsenic-containing waste. It comprises oxidizing the arsenic to pentavalent arsenic in an aqueous medium, contacting the pentavalent arsenic with trivalent iron to form an insoluble iron-arsenic compound and separating precipitated iron-arsenic compound from the aqueous medium. The oxidation of arsenic is effected using oxidizing bacteria at a pH between 0.5 and 4 and at a temperature between 20 and 90° C. in the presence of a mineral catalyst such as pyrite.