US3617537A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Biochemical sewage treatment via high purity molecular oxygen
Assignee: GEORGE E SNYDER ASSOCIATES
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Filing: 1969-03-12
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Granted: 1971-11-02
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Expires: 1989-03-12
Abstract
Abstract A process for improving aerobic biochemical purification of organic liquid wastes which includes dissolving high-purity oxygen under pressure into water, and mixing the oxygen-charged water with the organic liquid wastes in one stage of treatment to increase dissolved oxygen concentration in the mixture above what it was in the organic liquid wastes before mixing. The process can be used with a lagoon method of aerobic biological sewage treatment as well as with an activated sludge sewage treatment. Apparatus is disclosed for carrying out the process.
Inventors
- 👤 Floyd L Vermette
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:34
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/02; C02F3/12; C02F3/26; C02F2307/00; C02F2307/08; Y; Y02; Y02W; Y02W10/00; Y02W10/10; Y10; Y10S; Y10S210/00; Y10S210/902; Y10S210/906
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
57 words
Apparatus as is defined in claim 1, wherein said pressure charging means comprises a conduit having an inlet in communication with the effluent recirculating means and the oxygen-introducing means and an outlet in communication with said discharge means, said conduit having a plurality of transverse plates to promote dissolution of the molecular oxygen into the recirculated effluent.
Claim 2
Dependent Claim
30 words
Apparatus as is defined in claim 1, wherein said means for introducing molecular oxygen into said pressure-charging means includes controls responsive to a condition indicating the load on said clarifier.
Claim 3
Dependent Claim
29 words
Apparatus as is defined in claim 1, wherein said discharge means includes at least one pressure reducing valve for reducing the pressure of oxygen-charged effluent discharged to said clarifier.
Claim 4
Dependent Claim
84 words
A process for improving the phosphorus removing capability of an activated sludge sewage treatment plant which has an aerator and a clarifier receiving the mixed liquor effluent from the aerator, comprising the steps of recirculating a portion of the clarified effluent from the clarifier to the mixed effluent from the aerator, and during such recirculation charging high purity oxygen under pressure into the recirculated portion of the clarified effluent so that oxygen charged clarified effluent is mixed with the liquor effluent from the aerator.
Claim 5
Dependent Claim
49 words
A process as is defined in claim 5, wherein the step of oxygen charging utilizes commercially pure oxygen gas. 7, A process as is defined in claim 5, wherEin the pressure of the oxygen-charged clarified effluent is reduced immediately prior to mixing with the liquor effluent from the aerator.
Claim 6
Dependent Claim
68 words
A process for improving the phosphorus removing capability of an activated sludge sewage treatment plant which has an aerator and a clarifier receiving the mixed liquor effluent from the aerator, comprising the steps of dissolving high-purity oxygen under pressure into water to provide a highly oxygen-charged water, and mixing the highly oxygen-charged water with the mixed liquor clarifier influent to produce a dissolved oxygen saturated mixture for clarification.
Claim 7
Dependent Claim
29 words
A process as is defined in claim 8, wherein the pressure of the highly oxygen-charged water is reduced immediately prior to mixing the charged water with the clarifier influent.
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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) | 1974-11-01 | 1975-05-03 | 1975-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-01 | 1979-05-03 | 1979-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-01 | 1983-05-03 | 1983-11-02 | $7700.00 | Window Closed / Lapsed |