Patent US3887461A successfully refreshed from Google Patents.
US3887461A
Expired / Lapsed
US
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Making active carbon from sewage sludge
Assignee: Combustion Engineering Inc
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Filing: 1973-04-16
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Granted: 1975-06-03
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Expires: 1993-04-16
Abstract
Abstract The process of removing solids from sewage, subjecting these solids to pyrolysis, thereby producing active carbon and char, and using both of these materials as adsorbent agents in the treatment of the sewage or other waste water.
Inventors
- 👤 Robert D Nickerson
- 👤 Henry Cashel Messman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 04:29
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/02; C02F3/08; C02F3/085; C01; C01B; C01B32/00; C01B32/30; C01B32/312; C01B32/318; C01B32/324; C02F1/00; C02F1/28; C02F1/283; C02F11/00; C02F11/10; C10; C10B; C10B53/00; F; F23; F23G; F23G5/00; F23G5/02; F23G5/027; F23G5/0276; Y; Y02; Y02W; Y02W10/00; Y02W10/10; Y02W10/40
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
99 words
A METHOD OF TREATING SEWAGE INCLUDING THE STEPS OF SUBJECTING THE SEWAGE TO PRIMARY TREATMENT WHICH INCLUDES ALLOWING SOLIDS TO SETTLE OUT IN A SETTING TANK, CONVEYING THE SOLIDS TO A FURNACE, SUBJECTING THE SOLIDS TO PYROLITIC TREATMENT IN THE FURNACE AT TEMPERATURES WITHIN THE RANGE OF 500*C-1000*C BY PASSING A STREAM OF HOT GASES THERETHROUGH, TO FORM ACTIVE CARBON AND CHAR, SEPARATING THE ACTIVE CARBON FROM THE CHAR BY ENTRAINING IT IN THE GASES LEAVING THE FURNACE, SEPARATING THE ACTIVE CARBON FROM THE GASES, AND INTRODUCING THE ACTIVE CARBON INTO THE SETTLING TANK TO ACT AS AN ADSORBENT.
Claim 2
Independent Claim
99 words
A METHOD OF TREATING SEWAGE INCLUDING THE STEPS OF SUBJECTING THE SEWAGE TO PRIMARY TREATMENT WHICH INCLUDES ALLOWING SOLIDS TO SETTLE OUT IN A SETTING TANK, CONVEYING THE SOLIDS TO A FURNACE, SUBJECTING THE SOLIDS TO PYROLITIC TREATMENT IN THE FURNACE AT TEMPERATURES WITHIN THE RANGE OF 500*C-1000*C BY PASSING A STREAM OF HOT GASES THERETHROUGH, TO FORM ACTIVE CARBON AND CHAR, SEPARATING THE ACTIVE CARBON FROM THE CHAR BY ENTRAINING IT IN THE GASES LEAVING THE FURNACE, SEPARATING THE ACTIVE CARBON FROM THE GASES, AND INTRODUCING THE ACTIVE CARBON INTO THE SETTLING TANK TO ACT AS AN ADSORBENT.
Claim 3
Independent Claim
99 words
A method of treating sewage including the steps of subjecting the sewage to primary treatment which includes allowing solids to settle out in a settling tank, conveying the solids to a furnace, subjecting the solids to pyrolitic treatment in the furnace at temperatures within the range of 500*C-1000*C by passing a stream of hot gases therethrough, to form active carbon and char, separating the active carbon from the char by entraining it in the gases leaving the furnace, separating the active carbon from the gases, and introducing the active carbon into the settling tank to act as an adsorbent.
Claim 4
Independent Claim
99 words
A method of treating sewage including the steps of subjecting the sewage to primary treatment which includes allowing solids to settle out in a settling tank, conveying the solids to a furnace, subjecting the solids to pyrolitic treatment in the furnace at temperatures within the range of 500*C-1000*C by passing a stream of hot gases therethrough, to form active carbon and char, separating the active carbon from the char by entraining it in the gases leaving the furnace, separating the active carbon from the gases, and introducing the active carbon into the settling tank to act as an adsorbent.
Claim 5
Dependent Claim
30 words
The method set forth in claim 1, wherein the solids are subjected to pyrolitic treatment in an atmosphere which contains free oxygen in an amount between 0.1-2 percent by volume.
Claim 6
Dependent Claim
37 words
The method set forth in claim 1, including the additional steps of passing the effluent from the settling tank to a second tank, and introducing the char into the second tank to act as a supplementary adsorbent.
References Cited (Backward Citations)
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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) | 1978-06-02 | 1978-12-02 | 1979-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-02 | 1982-12-02 | 1983-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-02 | 1986-12-02 | 1987-06-03 | $7700.00 | Window Closed / Lapsed |