US3979293A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for the purification of effluent
Assignee: LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
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Filing: 1975-09-03
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Granted: 1976-09-07
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Expires: 1995-09-03
Abstract
Abstract An improved process for the purification of effluent is disclosed in which oxygenated effluent is introduced into a treatment zone in which a part of the total amount of biologically activated sludge used in the process is fixed on immersed bacterial beds or discs which are mobile and a further part of said sludge is in suspension in effluent undergoing treatment.
Inventors
- 👤 Paul Boulenger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 01:02
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/02; C02F3/08; C02F3/082; C02F3/12; C02F3/1205; C02F3/121; C02F3/1278; C02F3/1284; C02F3/26; Y; Y02; Y02W; Y02W10/00; Y02W10/10
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
312 words
An apparatus for the purification of a waste-containing liquid by oxygenation of said waste-containing liquid with a oxygen-enriched gas in contact with a biologically activated sludge, which apparatus comprises: a. an uncovered main treatment tank for containing a liquor comprising a suspension of the biologically activated sludge in the waste-containing liquid; b. withdrawing means of the overflow type connected to said treatment tank for withdrawing an effluent portion of the liquor; c. an inlet receptacle, separate from said main treatment tank, for containing a waste/sludge mixture; d. feeding means connected to said treatment tank for withdrawing another portion of the liquor from said treatment tank and feeding said portion into said inlet receptacle; e. introduction means for introducing raw waste-containing liquid into said inlet receptacle; f. a preliminary oxygenation chamber ensuring flow from said inlet receptacle to said main treatment tank, said preliminary oxygenation chamber comprising: an ascending flow-path entrance conduit extending inside said inlet receptacle and opening at its lower end into said inlet receptacle, a descending flow-path discharge conduit extending into said main treatment tank and opening at its lower end into said main treatment tank, and a gas-accumulation receiver, above said entrance and discharge conduits, in fluid communication with the upper ends thereof; g. gas injecting means for injecting the oxygen-enriched gas upwardly into said ascending flow-path entrance conduit to oxygenate said waste/sludge mixture within said ascending flow-path entrance conduit; and h. recycling means for recycling at least a portion of the non-dissolved gas recovered in said gas-accumulation receiver, said recycling means comprising: a compressor communicating on the suction side with the gas-accumulator receiver and on the delivery side with said gas-injecting means, wherein said gas-injecting means and said recycling means impart circulation of the oxygenated waste/sludge mixture successively upwardly through said ascending flow-path entrance conduit and downwardly through said descending flow-path discharge conduit into said main treatment tank.
Claim 2
Independent Claim
312 words
An apparatus for the purification of a waste-containing liquid by oxygenation of said waste-containing liquid with a oxygen-enriched gas in contact with a biologically activated sludge, which apparatus comprises: a. an uncovered main treatment tank for containing a liquor comprising a suspension of the biologically activated sludge in the waste-containing liquid; b. withdrawing means of the overflow type connected to said treatment tank for withdrawing an effluent portion of the liquor; c. an inlet receptacle, separate from said main treatment tank, for containing a waste/sludge mixture; d. feeding means connected to said treatment tank for withdrawing another portion of the liquor from said treatment tank and feeding said portion into said inlet receptacle; e. introduction means for introducing raw waste-containing liquid into said inlet receptacle; f. a preliminary oxygenation chamber ensuring flow from said inlet receptacle to said main treatment tank, said preliminary oxygenation chamber comprising: an ascending flow-path entrance conduit extending inside said inlet receptacle and opening at its lower end into said inlet receptacle, a descending flow-path discharge conduit extending into said main treatment tank and opening at its lower end into said main treatment tank, and a gas-accumulation receiver, above said entrance and discharge conduits, in fluid communication with the upper ends thereof; g. gas injecting means for injecting the oxygen-enriched gas upwardly into said ascending flow-path entrance conduit to oxygenate said waste/sludge mixture within said ascending flow-path entrance conduit; and h. recycling means for recycling at least a portion of the non-dissolved gas recovered in said gas-accumulation receiver, said recycling means comprising: a compressor communicating on the suction side with the gas-accumulator receiver and on the delivery side with said gas-injecting means, wherein said gas-injecting means and said recycling means impart circulation of the oxygenated waste/sludge mixture successively upwardly through said ascending flow-path entrance conduit and downwardly through said descending flow-path discharge conduit into said main treatment tank.
Claim 3
Dependent Claim
45 words
An apparatus in accordance with claim 1 further including: i. a mobile support of the bacterial bed type entirely located within said main treatment tank below said withdrawing means thereby allowing total submersion of said mobile support in the liquor within said main treatment tank.
Claim 4
Dependent Claim
118 words
An apparatus in accordance with claim 1 further including: j. control means for controlling the oxygen concentration in the liquor within said main treatment tank, said control means including a probe means for detecting the oxygen concentration of the liquor within said main treatment tank and means for adjusting at least one of the following parameters in response to the concentration detected by said probe means: 1. the feed-rate of the oxygen-enriched gas injected through said gas-injecting means, 2. the level of said gas-injecting means within said ascending flow-path entrance conduit, 3. the flow-rate of the oxygenated waste/sludge mixture within said descending flow-path discharge conduit, and 4. the flow-rate of the non-dissolved recycled gas within said recycling means.
Claim 5
Dependent Claim
38 words
An apparatus in accordance with claim 3 wherein the lower end of said descending flow-path discharge conduit is of regulatable cross-section, thus allowing control of the flow-rate of the oxygenated waste/sludge mixture within said descending flow-path discharge conduit.
Claim 6
Dependent Claim
31 words
An apparatus in accordance with claim 1 wherein said gas-injecting means includes a supply conduit for the oxygen-enriched gas connected into the conduit coming from the delivery side of said compressor.
Claim 7
Dependent Claim
43 words
An apparatus in accordance with claim 1 further including settlement means for receiving the effluent portion of the liquor removed by said withdrawing means and return means for returning a portion of the settled sludge from said settlement means to said inlet receptacle.
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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) | 1979-09-07 | 1980-03-08 | 1980-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-07 | 1984-03-08 | 1984-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-07 | 1988-03-08 | 1988-09-07 | $7700.00 | Window Closed / Lapsed |