US3920548A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wet oxidation process for waste material
Assignee: US Filter Zimpro Inc
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Filing: 1973-03-29
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Granted: 1975-11-18
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Expires: 1993-03-29
Abstract
Abstract In the wet oxidation of waste materials with an oxidizing gas, the process is carried out in a horizontally-elongated reactor vessel divided into generally cylindrical, interconnecting, compartments. An aqueous dispersion of the wastes is continuously introduced into a compartment at one end of the reactor vessel, and flows from compartment to compartment while an oxidizing gas is continuously introduced into each compartment. The dispersion is vigorously agitated to disperse the oxidizing gas, and thereby effect oxidation of the waste materials to produce an ecologically acceptable effluent. The average temperature of the dispersion is maintained at a low level, and the pH is held in the acid range.
Inventors
- 👤 W Martin Fassell
- 👤 Donald W Bridges
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:14
CPC Classifications
C; C02; C02F; C02F11/00; C02F11/06; C02F11/08
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
156 words
IN A PROCESS FOR THE WET OXIDATION OF CARBONACEOUS WASTE MATERIALS, WHEREIN AN AQUEOUS DISPERSION OF SAID MATERIALS IN CONTACTED WITH AN OXIDIZING GAS AT SUFFICIENT TIME, TEMPERATURE, AND PRESSURE TO EFFECT SUBSTANTIAL OXIDATION OF SAID MATERIALS, THE IMPROVEMENT CHARACTERIZED BY: A. EFFECTING SAID CONTACT AND SAID OXIDATION IN A HORIZONTALLYELONGATED REACTOR VESSEL DIVIDED INTO A PLURALITY OF GENERALLY CYLINDRICAL INTERCONNECTING COMPARTMENTS, B. CONTINUOUSLY INTRODUCING SAID AQUEOUS DISPERSION OF WASTE MATERIALS NEAR ONE END OF SAID REACTOR VESSEL, FLOWING SAID DISPERSION FROM COMPARTMENT TO COMPARTMENT THROUGH SAID VESSEL, AND WITHDRAWING OXIDIZED DISPERSION FROM NEAR THE OPPOSITE END OF SAID VESSEL. C. MAINTAINING THE PH OF SAID DISPERSION IN THE AID RANGE, D. CONTINUOUSLY INTRODUCING SAID OXIDIZING GAS INTO SAID DISPERSION IN A PLURALITY OF SAID COMPARTMENTS, AND E. VIGOUROUSLY AGITATING THE DISPERSION IN SAID PLURALITY OF COMPARTMENTS TO DISPERSE OXIDIZING GAS THERETHROUGH, AND THEREBY, EFFECT OXIDATION OF SAID WASTE MATERIALS TO PRODUCE AN ECOLOGICALLY ACCEPTABLE EFFLUENT.
Claim 2
Dependent Claim
156 words
IN A PROCESS FOR THE WET OXIDATION OF CARBONACEOUS WASTE MATERIALS, WHEREIN AN AQUEOUS DISPERSION OF SAID MATERIALS IN CONTACTED WITH AN OXIDIZING GAS AT SUFFICIENT TIME, TEMPERATURE, AND PRESSURE TO EFFECT SUBSTANTIAL OXIDATION OF SAID MATERIALS, THE IMPROVEMENT CHARACTERIZED BY: A. EFFECTING SAID CONTACT AND SAID OXIDATION IN A HORIZONTALLYELONGATED REACTOR VESSEL DIVIDED INTO A PLURALITY OF GENERALLY CYLINDRICAL INTERCONNECTING COMPARTMENTS, B. CONTINUOUSLY INTRODUCING SAID AQUEOUS DISPERSION OF WASTE MATERIALS NEAR ONE END OF SAID REACTOR VESSEL, FLOWING SAID DISPERSION FROM COMPARTMENT TO COMPARTMENT THROUGH SAID VESSEL, AND WITHDRAWING OXIDIZED DISPERSION FROM NEAR THE OPPOSITE END OF SAID VESSEL. C. MAINTAINING THE PH OF SAID DISPERSION IN THE AID RANGE, D. CONTINUOUSLY INTRODUCING SAID OXIDIZING GAS INTO SAID DISPERSION IN A PLURALITY OF SAID COMPARTMENTS, AND E. VIGOUROUSLY AGITATING THE DISPERSION IN SAID PLURALITY OF COMPARTMENTS TO DISPERSE OXIDIZING GAS THERETHROUGH, AND THEREBY, EFFECT OXIDATION OF SAID WASTE MATERIALS TO PRODUCE AN ECOLOGICALLY ACCEPTABLE EFFLUENT.
Claim 3
Dependent Claim
17 words
Process of claim 1 wherein said pH is within the range of about 1.5 to about 4.0.
Claim 4
Dependent Claim
11 words
Process of claim 1 wherein said waste materials are sewage sludge.
Claim 5
Dependent Claim
17 words
Process of claim 1 wherein said generally cylindrical compartments have a length approximately equal to their diameter.
Claim 6
Dependent Claim
25 words
Process of claim 1 wherein the average temperature of said dispersion in said reactor vessel is within the range of about 420* to about 480*F.
Claim 7
Dependent Claim
14 words
Process of claim 1 wherein said agitation is effected with vertically aligned vane impellers.
References Cited (Backward Citations)
US3649534A
Cited
US3661778A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-17 | 1979-05-19 | 1979-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-17 | 1983-05-19 | 1983-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-17 | 1987-05-19 | 1987-11-18 | $7700.00 | Window Closed / Lapsed |