US3945916A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of effluent
Assignee: LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
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Filing: 1974-06-07
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Granted: 1976-03-23
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Expires: 1994-06-07
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
2026-11-01 22:51
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: 8
Claim 1
Independent Claim
200 words
A process for the purification of a waste-containing liquid by oxygenation thereof with an oxygen-enriched gas in contact with a biologically activated sludge, comprising: a. introducing raw waste-containing liquid and biologically activated sludge into an inlet zone, thereby forming a waste/sludge mixture in said inlet zone; b. feeding the waste/sludge mixture, from the inlet zone, upwardly through a preliminary oxygenation zone and then downwardly through a descending passageway, connected to the top of the preliminary oxygenation zone, into a lower portion of a main treatment tank; c. oxygenating the waste/sludge mixture passing through the preliminary oxygenation zone by injecting oxygen-enriched gas upwardly into the preliminary oxygenation zone; d. recovering non-dissolved gas at the top of said preliminary oxygenation zone; e. discharging a predetermined portion of the recovered gas to atmosphere and recycling the remainder thereof to step (c); f. biologically treating the oxygenated waste in the treatment, entering from step (b); g. discharging to atmosphere any gases released by said treating step (f) in the treatment tank; and h. withdrawing a portion of the biologically activated sludge from the treatment tank and using said withdrawn sludge as at least a portion of the biologically activated sludge introduced in step (a).
Claim 2
Dependent Claim
200 words
A process for the purification of a waste-containing liquid by oxygenation thereof with an oxygen-enriched gas in contact with a biologically activated sludge, comprising: a. introducing raw waste-containing liquid and biologically activated sludge into an inlet zone, thereby forming a waste/sludge mixture in said inlet zone; b. feeding the waste/sludge mixture, from the inlet zone, upwardly through a preliminary oxygenation zone and then downwardly through a descending passageway, connected to the top of the preliminary oxygenation zone, into a lower portion of a main treatment tank; c. oxygenating the waste/sludge mixture passing through the preliminary oxygenation zone by injecting oxygen-enriched gas upwardly into the preliminary oxygenation zone; d. recovering non-dissolved gas at the top of said preliminary oxygenation zone; e. discharging a predetermined portion of the recovered gas to atmosphere and recycling the remainder thereof to step (c); f. biologically treating the oxygenated waste in the treatment, entering from step (b); g. discharging to atmosphere any gases released by said treating step (f) in the treatment tank; and h. withdrawing a portion of the biologically activated sludge from the treatment tank and using said withdrawn sludge as at least a portion of the biologically activated sludge introduced in step (a).
Claim 3
Dependent Claim
26 words
A process in accordance with claim 1 wherein, in said feeding step (b), the waste/sludge mixture overflows from said preliminary oxygenation zone into said descending passageway.
Claim 4
Dependent Claim
53 words
A process in accordance with claim 1 wherein said biologically treating step (f) is accomplished by contacting the oxygenated waste in the treatment tank with biologically activated sludge, a portion of which is fixed on a mobile support of the bacterial bed type totally submerged in the liquor within said main treatment tank.
Claim 5
Dependent Claim
95 words
A process in accordance with claim 1, further including the step of adjusting the amount of oxygen in the main treatment tank to the oxygen requirement of the waste containing liquid by adjusting at least one of the parameters selected from the group consisting of (i) the injected feed rate of the oxygen-enriched gas, (ii) the level of the injection of the oxygen-enriched gas within the ascending flowpath preliminary oxygenation zone, (iii) the flowrate of the non-dissolved gas recycled in step (e), and (iv) the flowrate of the oxygenated waste/sludge mixture within said descending passageway.
Claim 6
Dependent Claim
41 words
A process in accordance with claim 1 further including the steps of compressing the recycled non-dissolved gas of step (c) and admixing said compressed gas with said oxygen-enriched gas prior to being injected into the preliminary oxygenation zone in step (c).
Claim 7
Dependent Claim
56 words
A process in accordance with claim 1, wherein said withdrawing step (h) comprises withdrawing from the treatment tank a portion of the liquor comprising a suspension of biologically activated sludge in waste-containing liquid and introducing the withdrawn portion into the inlet zone as at least a portion of the biologically activated sludge introduced in step (a).
Claim 8
Dependent Claim
69 words
A process in accordance with claim 1 wherein said withdrawing step (h) comprises withdrawing from the treatment tank a portion of the liquor comprising a suspension of biologically activated sludge in waste-containing liquid; separating biologically activated sludge from said withdrawn liquor; and introducing at least a portion of the separated sludge into the inlet zone as at least a portion of the biologically activated sludge introduced in step (a).
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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) | 1979-03-23 | 1979-09-22 | 1980-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-23 | 1983-09-22 | 1984-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-23 | 1987-09-22 | 1988-03-23 | $7700.00 | Window Closed / Lapsed |