US3933629A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filtration
Assignee: BOC Group Ltd
•
Filing: 1974-06-14
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Granted: 1976-01-20
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Expires: 1994-06-14
Abstract
Abstract An oxygenation system for promoting the activity of microorganisms supported on a filter bed, by introducing an oxygenated liquid stream into contact with the microorganisms.
Inventors
- 👤 Kenneth Cecil Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:49
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/02; C02F3/04; C02F3/10; Y; Y02; Y02W; Y02W10/00; Y02W10/10; Y10; Y10S; Y10S261/00; Y10S261/72
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
155 words
A process for filtering an aqueous effluent material by introducing the effluent above a graded density filter bed wherein said bed includes layers of particulate material in which the smallest particles are of the most dense material and are at the lowest level and the largest particles are the least dense material and are at the uppermost level, and passing the same downward through the filter bed in which micro-organisms are supported wherein the micro-organisms are supplied with oxygen by substantially dissolving substantially pure oxygen gas in water to form oxygenated water and passing the thus oxygenated water downwardly through the filter bed whereby the bio-availability of oxygen to the organisms is inhanced without significant disturbance of the graded density of the filter bed thereby promoting the biological activity of the micro-organisms, and removing accumulated waste material from the filter bed by back flushing with attendant establishment of the graded density of the filter bed.
Claim 2
Dependent Claim
155 words
A process for filtering an aqueous effluent material by introducing the effluent above a graded density filter bed wherein said bed includes layers of particulate material in which the smallest particles are of the most dense material and are at the lowest level and the largest particles are the least dense material and are at the uppermost level, and passing the same downward through the filter bed in which micro-organisms are supported wherein the micro-organisms are supplied with oxygen by substantially dissolving substantially pure oxygen gas in water to form oxygenated water and passing the thus oxygenated water downwardly through the filter bed whereby the bio-availability of oxygen to the organisms is inhanced without significant disturbance of the graded density of the filter bed thereby promoting the biological activity of the micro-organisms, and removing accumulated waste material from the filter bed by back flushing with attendant establishment of the graded density of the filter bed.
Claim 3
Dependent Claim
17 words
A process as claimed in claim 1 wherein the micro-organisms are bacteria of the activated sludge type.
Claim 4
Dependent Claim
19 words
A process as claimed in claim 1 wherein the oxygen content of the oxygen-enriched gas is greater than 90%.
Claim 5
Dependent Claim
15 words
A process as claimed in claim 3, wherein the oxygen content is greater than 98%.
Claim 6
Dependent Claim
24 words
A process as claimed in claim 1, wherein oxygenated water and aqueous effluent material to be filtered are introduced alternately into the filter bed.
Claim 7
Dependent Claim
16 words
A process as claimed in claim 1 wherein the filter bed is maintained at super-atmospheric pressure.
Claim 8
Dependent Claim
24 words
A process as claimed in claim 1 wherein the several layers of particulate material are in descending order of polystyrene, anthracite and sand, respectively.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-01-19 | 1979-07-21 | 1980-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-19 | 1983-07-21 | 1984-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-19 | 1987-07-21 | 1988-01-20 | $7700.00 | Window Closed / Lapsed |