Patent US3669271A successfully refreshed from Google Patents.
US3669271A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Siphon type sludge removal system for a sewage settling tank
Assignee: Xylem Water Solutions Zelienople LLC
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Filing: 1970-12-11
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Granted: 1972-06-13
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Expires: 1990-12-11
Abstract
Abstract A siphon arrangement for removing sludge from the bottom of a sewage settling tank and discharging it into a sludge tank from which it is removed. The inlet of the siphon is submerged in the sewage adjacent the bottom of the settling tank and its outlet is submerged in the sludge discharged into the sludge tank. The siphon is carried by a float supported by the liquid in the settling tank, the level of which may vary as more or less sewage to be treated flows into the tank. The level of the sludge in the sludge tank will always be lower than the level of the liquid in the settling tank and it is important to the operation of the siphon to maintain constant this relationship of the levels of the liquids in the two tanks. This is accomplished by a control arrangement for controlling the discharge of the sludge from the sludge tank in accordance with variations in the level of the liquid in the settling tank.
Inventors
- 👤 Robert F Mcgivern
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:28
CPC Classifications
B; B01; B01D; B01D21/00; B01D21/24; B01D21/245; B01D21/30; B01D21/302; B01D21/34
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
270 words
A liquid clarification system comprising a settling chamber having inlet and outlet means arranged to permit settling of a sludge on the chamber bottom from liquid in the chamber and arranged to permit variations in the liquid level in the chamber, a siphon for removing the sludge from the bottom of the chamber and comprising a conduit having an inlet adjacent the bottom of the chamber and an outlet, a second chamber independent of the first chamber in which the siphon outlet is located and having a bottom located so that it is always below the level of the liquid in the first chamber, said second chamber having a discharge outlet for sludge which is discharged thereinto, controlled by a discharge valve, means for supporting said siphon comprising a support which floats in the liquid in the first chamber so as to maintain constant the vertical distance relationship between the level of the siphon outlet and the level of the liquid in the first chamber regardless of variations in the liquid level in that chamber so as to remove the sludge deposited on the chamber bottom without disturbing said vertical distance relationship between said liquid level and said siphon outlet level, said siphon outlet being submerged below the level of the liquid in the second chamber, and means for controlling said discharge valve of the second chamber in response to changes in level of the liquid in said fiRst chamber to change the level of the liquid in the second chamber so as to maintain substantially constant the vertical distance between the levels of the liquids in the two chambers.
Claim 2
Dependent Claim
270 words
A liquid clarification system comprising a settling chamber having inlet and outlet means arranged to permit settling of a sludge on the chamber bottom from liquid in the chamber and arranged to permit variations in the liquid level in the chamber, a siphon for removing the sludge from the bottom of the chamber and comprising a conduit having an inlet adjacent the bottom of the chamber and an outlet, a second chamber independent of the first chamber in which the siphon outlet is located and having a bottom located so that it is always below the level of the liquid in the first chamber, said second chamber having a discharge outlet for sludge which is discharged thereinto, controlled by a discharge valve, means for supporting said siphon comprising a support which floats in the liquid in the first chamber so as to maintain constant the vertical distance relationship between the level of the siphon outlet and the level of the liquid in the first chamber regardless of variations in the liquid level in that chamber so as to remove the sludge deposited on the chamber bottom without disturbing said vertical distance relationship between said liquid level and said siphon outlet level, said siphon outlet being submerged below the level of the liquid in the second chamber, and means for controlling said discharge valve of the second chamber in response to changes in level of the liquid in said fiRst chamber to change the level of the liquid in the second chamber so as to maintain substantially constant the vertical distance between the levels of the liquids in the two chambers.
Claim 3
Dependent Claim
51 words
A system according to claim 1 in which said discharge valve comprises a movable valve which controls the discharge flow from said discharge outlet of the second chamber, and said controlling means comprises means for moving said valve in response to changes in level of the liquid in said first chamber.
Claim 4
Dependent Claim
54 words
A system according to claim 2 in which said valve moving means comprises an electric motor, a differential pressure activated electric switch electrically connected to and controlling said motor, and fluid lines connected to said pressure switch and to the respective chambers for subjecting the switch to the different pressures in the respective chambers.
Claim 5
Dependent Claim
36 words
A system according to claim 2 in which said controlling means comprises a float device subjected to the level of liquid in said first chamber, and an operative connection between said float device and said valve.
Claim 6
Dependent Claim
15 words
A system according to claim 4 in which said operative connection is a mechanical connection.
Claim 7
Dependent Claim
77 words
A system according to claim 1 in which said first chamber is provided in a tank, said second chamber being in the form of a channel extending across the tank, said channel having a bottom which inclines toward said sludge discharge outlet so that there will be gravity flow of the sludge to and through said outlet, said siphon outlet being positioned above said second chamber bottom at all levels of the liquid in said first chamber.
Claim 8
Dependent Claim
67 words
A system according to claim 6 in which a plurality of said siphon conduits are provided with their inlets located at laterally spaced positions in said first chamber along the bottom of the tank, all of said siphon conduits being supported by a carriage for movement across the tank with their inlets moving along the bottom of the tank and with their outlets movable through said channel.
Claim 9
Dependent Claim
29 words
A system according to claim 7 in which each siphon conduit is provided with means for adjusting the level of its inlet relative to the bottom of the tank.
References Cited (Backward Citations)
US2826306A
Cited
US3333704A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-13 | 1975-12-13 | 1976-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-13 | 1979-12-13 | 1980-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-13 | 1983-12-13 | 1984-06-13 | $7700.00 | Window Closed / Lapsed |