US5043080A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treating contaminated effluents and groundwaters
Assignee: Calgon Carbon Canada Inc
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Filing: 1990-02-26
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Granted: 1991-08-27
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Expires: 2010-02-26
Abstract
Abstract A method of treating a liquid effluent or groundwater containing organic contaminants is provided. The liquid effluent or groundwater containing the organic contaminants is contacted with hydrogen peroxide and transition metal ions. The hydrogen peroxide and transition metal ions are present in effective amounts based on the concentration of the organic contaminants in the liquid effluent or groundwater. The liquid effluent or groundwater is then irradiated with UV light having a poly- chromatic output between about 200 to 400 nm to decompose the organic contaminants. The ratio of hydrogen peroxide to transition metal ions is selected so as to favor the absorption of UV light by the hydrogen peroxide in the irradiation step.
Inventors
- 👤 Stephen R. Cater
- 👤 Pauline M. Brown
- 👤 J. Adele Buckley
- 👤 R. D. Samuel Stevens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:49
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/30; C02F1/32; C02F1/72; C02F1/722; C02F1/725; C02F2103/00; C02F2103/06; C02F2305/00; C02F2305/10; Y; Y02; Y02W; Y02W10/00; Y02W10/30; Y02W10/37; Y10; Y10S; Y10S210/00; Y10S210/902; Y10S210/908; Y10S210/909
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
163 words
A method of treating a liquid effluent or groundwater containing organic contaminants comprising the steps of: (a) providing a liquid effluent or groundwater containing organic contaminants; (b) contacting the liquid effluent or groundwater at a pH of between about 2 and 4 with hydrogen peroxide and transition metal ions, the hydrogen peroxide and transition metal ions being present in effective amounts based on the concentration of the organic contaminants in the liquid effluent or groundwater; and (c) irradiating the liquid effluent or groundwater with UV light, the UV light having a polychromatic output between about 200 to 400 nm and an input power of at least about 1 Kw to decompose the organic contaminants; wherein the ratio of hydrogen peroxide to transition metal ions is about 10:1 to 1:1 and is selected so as to favor the absorption of UV light by the hydrogen peroxide and the organic contaminant relative to the absorption of UV light by transition metal ions in step (c).
Claim 2
Independent Claim
163 words
A method of treating a liquid effluent or groundwater containing organic contaminants comprising the steps of: (a) providing a liquid effluent or groundwater containing organic contaminants; (b) contacting the liquid effluent or groundwater at a pH of between about 2 and 4 with hydrogen peroxide and transition metal ions, the hydrogen peroxide and transition metal ions being present in effective amounts based on the concentration of the organic contaminants in the liquid effluent or groundwater; and (c) irradiating the liquid effluent or groundwater with UV light, the UV light having a polychromatic output between about 200 to 400 nm and an input power of at least about 1 Kw to decompose the organic contaminants; wherein the ratio of hydrogen peroxide to transition metal ions is about 10:1 to 1:1 and is selected so as to favor the absorption of UV light by the hydrogen peroxide and the organic contaminant relative to the absorption of UV light by transition metal ions in step (c).
Claim 3
Dependent Claim
25 words
The method as claimed in claim 1, wherein the UV light used in step (c) has a polychromatic output between about 200 to 300 nm.
Claim 4
Independent Claim
24 words
The method as claimed in any one of claims 1 or 2, wherein the transition metal ions are supplied by iron or copper compounds.
Claim 5
Independent Claim
43 words
The method as claimed in any one of claims 1 or 2, wherein the transition metal ions are supplied by one or more of Fe(OH) 3 , Fe 2 O 3 , FeCl 3 , or Fe 2 (SO 4 ) 3 .
Claim 6
Independent Claim
37 words
The method as claimed in any one of claims 1 or 2, wherein the transition metal ions are supplied by one or more of FeO, Fe(OH) 2 , FeCl 2 , FeCO 3 or FeSO 4 .
Claim 7
Independent Claim
25 words
The method as claimed in any one of claims 1 or 2 wherein the transition metal ions are supplied by FeSO 4 •7H 2 O.
Claim 8
Independent Claim
38 words
The method as claimed in any one of claims 1 or 2, wherein the organic contaminants are one or more compounds selected from the group consisting of benzene, toluene, xylene, napthalene, anthracene, chlorobenzene, trinitrotoluene, trichloroethane, trichloroethylene, or dioxane.
Claim 9
Independent Claim
135 words
The method as claimed in any one of claims 1 or 2, wherein the organic contaminants are selected from at least one member of the group of compounds consisting of linear, branched and cyclic alkyls and alkenyls having 1 to 20 carbon atoms, said alkyls and alkenyls consisting of substituted and unsubstituted alkyls and alkenyls, substituents being selected from the group of radicals consisting of fluorine, chlorine, bromine, nitro, sulfo, carboxyl, hydroxyl of C 1 -C 10 -alkoxy; aromatic and polyaromatic compounds, said aromatic and polyaromatic compounds consisting of substituted and unsubstituted aromatic and polyaromatic compounds, substituents being selected from the group of radicals consisting of linear and branched alkyls and alkenyls having 1 to 10 carbon atoms, fluorine, chlorine, bromine, nitro, sulfo, carboxyl, hydroxyl or C 1 -C 10 -alkoxy; fused phenols; and, ethers.
Claim 10
Independent Claim
61 words
The method as claimed in any one of claims 1 or 2, wherein the organic contaminants are selected from at least one member of the group consisting of substituted and unsubstituted aromatic and polyaromatic compounds and ethers, substituents being selected from the group of radicals consisting of linear and branched alkyls having 1 to 10 carbon atoms, nitro, chloro and bromo.
Claim 11
Independent Claim
69 words
The method as claimed in any one of claims 1 or 2, wherein the organic contaminants are selected from at least one member of the group consisting of phenolics, substituted and unsubstituted biphenyls and fused phenols, substituents being selected from the group consisting of linear and branched alkyls and alkenyls having 1 to 10 carbon atoms, fluorine, chlorine, bromine, nitro, sulfo, carboxyl, hydroxyl, and C 1 -C 10 -alkoxy.
References Cited (Backward Citations)
US4012321A
Cited
US4167973A
Cited
US4321143A
Cited
US4446029A
Cited
US4512900A
Cited
US4604214A
Cited
JPS62282688A
Cited
US4892664A
Cited
US4849114A
Cited
US4861484A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-08-26 | 1995-02-25 | 1995-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-08-26 | 1999-02-25 | 1999-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-08-26 | 2003-02-25 | 2003-08-27 | $7700.00 | Window Closed / Lapsed |