US3905899A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of wastewater treatment
Assignee: Siemens Water Technologies Holding Corp
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Filing: 1973-05-29
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Granted: 1975-09-16
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Expires: 1993-05-29
Abstract
Abstract Method and apparatus for substantially upgrading the operating efficiency of wastewater treatment plants is disclosed. The invention utilizes forcibly rotating bodies that are partially submerged in the wastewater to provide surface area on which biological slimes develop and remove pollutants from the wastewater. The rotating, partially submerged bodies are located in the upper portion of the treatment tanks, to provide a biological treatment zone. A subjacent settling zone, physically separated from the biological treatment zone by a ''''false bottom'''' or longitudinal baffle is provided in the lower portion of the treatment tank. Wastewater introduced in the tank is first biologically treated and then circulated through the subjacent settling zone to remove settleable solids.
Inventors
- 👤 Wilbur N Torpey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:04
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/02; C02F3/08; C02F3/082; Y; Y02; Y02W; Y02W10/00; Y02W10/10
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
169 words
METHOD FOR THE CONTINUOUS TREATMENT OF WASTEWATER COMPRISING A. PROVIDING A TREATMENT TANK HAVING A BIOLOGICAL TREATMENT ZONE IN ITS UPPER PORTION AND SETTLING ZONE IN ITS LOWER PORTION, B. SAID SETTLNG ZONE BING SUBJACEN TO AND SUBSTANTIALLY COEXTENSIVE WITH SAID BIOLOGICAL TREATMENT ZONE, C. INTRODUCING WASTEWATER INTO SAID BIOLOGICAL TREATMENT ZONE, D. MAINTAINING A PREDETERMINED DEPTH OF WASTEWATER IN SAID TREATMENT TANK, E. CREATING A FLOW OF SUBSTANTIALLY ALL OF SAID WASTEWATER THROUGH SAID BIOLOGICAL TREATMENT ZONE, F. CREATING A FLOW OF WASTEWATER THROUG SAID SETTLING ZONE COUNTER TO THE DIRECTION OF WASTEWATER FLOW IN SAID BIOLOGICAL TREATMENT ZONE, G. SAID BIOLOGICAL TREATMENT ZONE INCLUDING A PURALITY OF ROTATABLY MOUNTED PARALLEL SHAFTS MOUNTED ACROSS SAID TREATMENT TANK TRANSVERSE TO THE DIRECTION OF WASTEWATER FLOW AND A PLURALITY OF DISC MEMBERS MOUNTED ON EACH OF SAID PARALLEL SHAFTS AND EXTENDING INTO SAID WASTEWATER AND, H. ROTATING SAID DISC MEMBERS AT A PERIPHERAL VELOCITY ADEQUATE TO PERMIT THE GROWTH OF AREOBIC BIOLOGICAL SLIMES ON THE SURFACE OF SAID DISC MEMBERS.
Claim 2
Dependent Claim
169 words
METHOD FOR THE CONTINUOUS TREATMENT OF WASTEWATER COMPRISING A. PROVIDING A TREATMENT TANK HAVING A BIOLOGICAL TREATMENT ZONE IN ITS UPPER PORTION AND SETTLING ZONE IN ITS LOWER PORTION, B. SAID SETTLNG ZONE BING SUBJACEN TO AND SUBSTANTIALLY COEXTENSIVE WITH SAID BIOLOGICAL TREATMENT ZONE, C. INTRODUCING WASTEWATER INTO SAID BIOLOGICAL TREATMENT ZONE, D. MAINTAINING A PREDETERMINED DEPTH OF WASTEWATER IN SAID TREATMENT TANK, E. CREATING A FLOW OF SUBSTANTIALLY ALL OF SAID WASTEWATER THROUGH SAID BIOLOGICAL TREATMENT ZONE, F. CREATING A FLOW OF WASTEWATER THROUG SAID SETTLING ZONE COUNTER TO THE DIRECTION OF WASTEWATER FLOW IN SAID BIOLOGICAL TREATMENT ZONE, G. SAID BIOLOGICAL TREATMENT ZONE INCLUDING A PURALITY OF ROTATABLY MOUNTED PARALLEL SHAFTS MOUNTED ACROSS SAID TREATMENT TANK TRANSVERSE TO THE DIRECTION OF WASTEWATER FLOW AND A PLURALITY OF DISC MEMBERS MOUNTED ON EACH OF SAID PARALLEL SHAFTS AND EXTENDING INTO SAID WASTEWATER AND, H. ROTATING SAID DISC MEMBERS AT A PERIPHERAL VELOCITY ADEQUATE TO PERMIT THE GROWTH OF AREOBIC BIOLOGICAL SLIMES ON THE SURFACE OF SAID DISC MEMBERS.
Claim 3
Dependent Claim
24 words
Method according to claim 1 wherein said disc members extend into said wastewater less than one half the waste-water depth in said treatment tank.
Claim 4
Dependent Claim
22 words
Method according to claim 1 wherein said disc members are submerged in said wastewater to less than one half of their diameter.
Claim 5
Dependent Claim
25 words
Method according to claim 1 wherein said peripheral velocity is greater than about 0.5 feet per second and less than about 3 feet per second.
Claim 6
Dependent Claim
34 words
Method according to claim 1 wherein the directional component of said peripheral velocity at the lowermost submerged portion of said disc members is in the direction of wastewater flow through said biological treatment zone.
References Cited (Backward Citations)
US3575849A
Cited
US3776841A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-15 | 1979-03-17 | 1979-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-15 | 1983-03-17 | 1983-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-15 | 1987-03-17 | 1987-09-16 | $7700.00 | Window Closed / Lapsed |