Liquid purification or separation – Processes – Ion exchange or selective sorption
Reexamination Certificate
2007-12-25
2007-12-25
Prince, Fred G. (Department: 1724)
Liquid purification or separation
Processes
Ion exchange or selective sorption
C210S683000, C210S906000, C210S911000
Reexamination Certificate
active
10708001
ABSTRACT:
A lignocellulose-based anion-adsorbing medium (LAM) and process for making and using same for selectively removing phosphates and arsenic contaminants from aqueous solutions is disclosed. Making the LAM comprises (a) dissociating cations such as Fe and Al, from their counterions by adding a chemical compound containing said cations to water and acidifying; (b) pelletizing a lignocellulose; (c) adsorbing the cations to the lignocellulose by bringing the lignocellulose into contact with the solution of step (a) and incubating; and, (d) exposing the lignocellulose of step (c) to an alkaline fixing agent to replace hydrogens (H) of the hydroxyl groups of the lignocellulose with the adsorbed cations to produce the LAM with a positive charge. The LAM may be used to selectively and cost-effectively remove phosphate and arsenic contaminants from aqueous solutions by retaining them at the Fe or Al on the LAM.
REFERENCES:
patent: 1297028 (1919-03-01), Soraas
patent: 3872002 (1975-03-01), Musgrove
patent: 3903074 (1975-09-01), Van Reesema
patent: 3931003 (1976-01-01), Jorgensen
patent: 4200735 (1980-04-01), Sano et al.
patent: 4432921 (1984-02-01), Haars et al.
patent: 4869735 (1989-09-01), Miyazawa et al.
patent: 5045210 (1991-09-01), Chen et al.
patent: 5314638 (1994-05-01), Morine et al.
patent: 5411569 (1995-05-01), Hjersted
patent: 5447603 (1995-09-01), Michalowski et al.
patent: 5492723 (1996-02-01), Sanderson et al.
patent: 5492759 (1996-02-01), Eriksson et al.
patent: 5736064 (1998-04-01), Edamura et al.
patent: 5907037 (1999-05-01), Gujral et al.
patent: 6042731 (2000-03-01), Bonniin
patent: 6143692 (2000-11-01), Sanjay et al.
patent: 6217942 (2001-04-01), Bolle et al.
patent: 6318021 (2001-11-01), Whiteley
patent: 6342191 (2002-01-01), Kepner et al.
patent: 6409978 (2002-06-01), Faulkner et al.
patent: 6896813 (2005-05-01), Harthill et al.
patent: 24 27 425 (1973-06-01), None
patent: 27 08 974 (1976-03-01), None
patent: 270 704 (1988-04-01), None
patent: 286 805 (1989-08-01), None
patent: JA 0084355 (1978-07-01), None
patent: JA 0115543 (1979-09-01), None
patent: J5 7019-98 (1980-07-01), None
patent: 363023934 (1988-02-01), None
patent: JO 3008-495 (1991-01-01), None
patent: JO 3114 587 (1991-05-01), None
Unnithan et al., Ability of Iron (III)-loaded carboxylated polyacrylamide-grafted sawdust to remove phosphate ions from acqueous solution and fertilizer industry wastewater: adsorption kinetics and isotherm studies. J. Applied Polymer Science, vol. 84, 2541-2553 (2002).
Wigginton and Lenhart, Using iron-infused media and stormfilter technology for the removal of dissolved phosphorus from stormwater discharges. Unpublished manuscript.
STORMWATER INC. brochure entitled, Storm Filter.
Urano et al., Process development for removal and recovery of phosphorus from wastewater by a new adsorbent. 1. preparation method and adsorption capability of a new adsorbent. Ind. Eng. Chem. Res. 1991, 30:1893-1896.
Urano et al., Process development for removal and recovery of phosphorus from wastewater by a new adsorbent. 3. Desorption of phosphate and regeneration of adsorbent. Ind. Eng. Chem. Res. 1992, 31:1510-1513.
Urano et al., Process development for removal and recovery of phosphorus from wastewater by a new adsorbent. 4. Recovery of phosphate and aluminum from desorbing solution. Ind. Eng. Chem. Res. 1992, 31:1513-1515.
Baker et al., Laboratory development of permeable reactive mixtures for the removal of phosphorus from onsite wastewater disposal systems. Environ. Sci. Technol. 1998 32: 2308-2316.
Munoz et al., Arsenic adsorption by Fe(III)-loaded open-celled cellulose spongs. Thermodynamic and selectivity aspects. Environ. Sci. Technol. 2002 36:3405-3411.
Suvasis et al., Coparison of arsenic (V) and arsenic (III) sorption onto iron oxide minerals: implications for arsenic mobility. Environ. Sci. Technol. 2003, 37: 4182-4189.
Myers et al., Iron oxide sink method for extracting soil phosphorus: paper preparation and use. Soil Sci. Soc. Am. J. 61: 1400-1407 (1997).
Urano et al., Process development for removal and recovery of phosphorus from wastewater by a new adsorbent. 1. preparation method and adsorption capability of a new adsorbent. Ind. Eng. Chem. Res. 1991, 30: 1893-1896.
Deae-Dextran, data file from Amersham Biosciences. df 18-1151-76 AA, Nov. 2001, pp. 1-4.
H2O Technologies, LLC
Landgale Vallotton, LLP
Prince Fred G.
Sinnott John P.
LandOfFree
Lignocellulose-based anion-adsorbing medium (LAM) and... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Lignocellulose-based anion-adsorbing medium (LAM) and..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Lignocellulose-based anion-adsorbing medium (LAM) and... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3853783