US4294703A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrogen peroxide treatment of effluent
Assignee: Bayer AG
•
Filing: 1980-07-02
•
Granted: 1981-10-13
•
Expires: 2000-07-02
Abstract
Abstract In the process for decreasing the COD-content of effluent by treating with hydrogen peroxide in the presence of a transition metal compound, the improvement which comprises adding to the effluent about 5 to 40% of the calculated quantity of H 2 O 2 required for the total oxidation of the total COD-content of the effluent, the transition metal compound being dissolved in the effluent in an amount such that the molar ratio of H 2 O 2 to transition metal is from about 30:1 to 3:1, bringing the pH initially to about 2 to 9, maintaining the effluent at about 5° to 100° C., and separating from the effluent whatever material has flocculated. Thereafter the effluent can be subjected to conventional biological degradation such as by the activated sludge process.
Inventors
- 👤 Klaus G. Wilms
- 👤 Helmut Waldmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:18
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/72; C02F1/722; C02F1/725
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
127 words
In the process for decreasing the COD-content of effluent by treating with hydrogen peroxide in the presence of a transition metal compound, the improvement which comprises adding to the effluent about 5 to 40% of the calculated quantity of H 2 O 2 required for the total oxidation of the total COD-content of the effluent, the transition metal compound being dissolved in the effluent in an amount such that the molar ratio of H 2 O 2 to transition metal is from about 30:1 to 3:1, bringing the pH initially to about 2 to 9, maintaining the effluent at about 5° to 100° C., separating from the effluent whatever material has flocculated, and after the removal of the flocculated material the effluent is subjected to biological degradation.
Claim 2
Dependent Claim
127 words
In the process for decreasing the COD-content of effluent by treating with hydrogen peroxide in the presence of a transition metal compound, the improvement which comprises adding to the effluent about 5 to 40% of the calculated quantity of H 2 O 2 required for the total oxidation of the total COD-content of the effluent, the transition metal compound being dissolved in the effluent in an amount such that the molar ratio of H 2 O 2 to transition metal is from about 30:1 to 3:1, bringing the pH initially to about 2 to 9, maintaining the effluent at about 5° to 100° C., separating from the effluent whatever material has flocculated, and after the removal of the flocculated material the effluent is subjected to biological degradation.
Claim 3
Dependent Claim
17 words
A process according to claim 1, wherein the starting pH value is from about 3.5 to 6.5.
Claim 4
Dependent Claim
37 words
A process according to claim 1, wherein about 10 to 35% of the calculated quantity of H 2 O 2 required for the total oxidation of the total COD-content of the effluent is added to the effluent.
Claim 5
Dependent Claim
20 words
A process according to claim 1, wherein the transition metal comprises at least one of copper, aluminum, zinc and iron.
Claim 6
Dependent Claim
39 words
A process according to claim 1, wherein the transition metal compound is present in an amount such that the molar ratio of the hydrogen peroxide to the transition metal compound in the effluent is from about 20:1 to 10:1.
Claim 7
Dependent Claim
94 words
A process according to claim 1, wherein the starting pH is from about 4 to 5, about 15 to 30% of the calculated quantity of H 2 O 2 required for the total oxidation of the total COD-content of the effluent is added to the effluent, the transition metal comprises iron and it is present in an amount such that the molar ratio of the hydrogen peroxide to the transition metal in the effluent is from about 18:1 to 13:1, a base is added to the effluent prior to removal of the flocculated material.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-10-12 | 1985-04-13 | 1985-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-12 | 1989-04-13 | 1989-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-12 | 1993-04-13 | 1993-10-13 | $7700.00 | Window Closed / Lapsed |