Selenium removal from water

Details Selenium removal from water Selenium removal from water

2005-11-22

2008-09-02

Hruskoci, Peter A. (Department: 1797)

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

C210S725000, C210S727000, C210S904000, C210S911000, C210S912000, C423S493000, C423S509000

Reexamination Certificate

active

07419602

ABSTRACT:
A process for removing selenium from a water stream, in particular a waste water stream, by: 1) the addition thereto of a ferric salt, followed by 2) the addition of a cupric salt and pH adjustment to a pH value in the range of from about 6.5 to about 8.0, thereby forming a copper-and-selenium-containing precipitate, and 3) removing the copper-and-selenium-containing precipitate to thereby form a treated water stream, is disclosed. The optional precipitation and removal of excess copper ions is also disclosed.

REFERENCES:
patent: 4806264 (1989-02-01), Murphy
patent: 5089141 (1992-02-01), Murphy
patent: 5993667 (1999-11-01), Overman
patent: 6033572 (2000-03-01), Yano
patent: 6156191 (2000-12-01), Overman
patent: 6214238 (2001-04-01), Gallup
patent: 6635182 (2003-10-01), Coleman, Jr.
patent: 7138063 (2006-11-01), Teter et al.

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