Process for removing arsenic from aqueous streams

Details Process for removing arsenic from aqueous streams Process for removing arsenic from aqueous streams

2007-11-27

2007-11-27

Hruskoci, Peter A. (Department: 1724)

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

C210S665000, C210S667000, C210S668000, C210S683000, C210S721000, C210S911000, C423S087000

Reexamination Certificate

active

11435697

ABSTRACT:
Arsenic is removed from water and other aqueous feeds by (1) treating the feed with a compound containing cerium in the +4 oxidation state, preferably cerium dioxide, to oxidize arsenic in the +3 oxidation state to arsenic in the +5 oxidation state and (2) removing the arsenic in the +5 oxidation state from the aqueous phase, normally by contacting the treated feed with alumina or other precipitating agent containing cations in the +3 oxidation state.

REFERENCES:
patent: 3916585 (1975-11-01), Barks
patent: 4001375 (1977-01-01), Longo
patent: 4046687 (1977-09-01), Schulze
patent: 4346063 (1982-08-01), Cahn et al.
patent: 4596659 (1986-06-01), Nomura et al.
patent: 5043072 (1991-08-01), Hitotsuyanagi et al.
patent: 5053139 (1991-10-01), Dodwell et al.
patent: 5603838 (1997-02-01), Misra et al.
patent: 6197201 (2001-03-01), Misra et al.
patent: 6221118 (2001-04-01), Yishida et al.
patent: 6368510 (2002-04-01), Friot
patent: 6383395 (2002-05-01), Clarke et al.
patent: 6395659 (2002-05-01), Seto et al.
patent: 6613230 (2003-09-01), Krulik et al.
patent: 6800204 (2004-10-01), Harck et al.
patent: 6863825 (2005-03-01), Witham et al.
patent: 2002/0003116 (2002-01-01), Golden
patent: 2003/0155303 (2003-08-01), Harck et al.
Ahmed, M. Feroze, “An Overview of Arsenic Removal Technologies in Bangladesh and India,” Buet-Unu International Workshop on Technologies for Arsenic Removal from Drinking Water, May 5-7, 2001, pp. 251-269.
“UI Arsenic Water Treatment Project Shows Promise,” Environmental News Network—ENN Direct, Dec. 3, 2002, pp. 1-2.
“Clear Choices for Clean Drinking Water,”Consumer Reports, Jan. 2003, pp. 33-37.
Zhang, Yu, Yang, Min, Huang, Xia, “Arsenic(V) Removal With A Ce(IV)-Doped Iron Oxide Adsorbent,”Chemosphere, vol. 51, No. 9, Jun. 2003, pp. 945-952.

Affiliated with

Also associated with

Rating

Process for removing arsenic from aqueous streams does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process for removing arsenic from aqueous streams, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for removing arsenic from aqueous streams will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3856899