Method and apparatus for use in the activated sludge treatment of sewage
Abstract
Abstract AN APPARATUS AND METHOD USED IN THE ACTIVATED SLUDGE TREATMENT OF SECONDARY SEWAGE UTILIZES A PRESSURE AERATION TANK FOR TREATING A CONTINOUS FLOW OF SEWAGE INFLUENT. THE TANK IS MAINTAINED AT PRESSURE UP TO 60 P.S.I. AND THE MIXED LIQUOR IN THE TANK IS CONTINUOUSLY ACRATED. INFLUENT IS INTRODUCED IN THE AERATION TANK THROUGH A DISTRIBUTION MANIFOLD AT SPEED POINTS LONGITUDINALLY OF THE TANK. UPON ENTERING THE AERATION TANK, THE INFLUENT IS INTERMIXED WITH RETURN ACTIVATED SLUDGE (MADE OF LIVING MICRO-ORGANISM) FORMING A MIXED LIQUOR, WITHIN THE MIXED LIQUOR, MICRO-ORGANISM FEED UPON THE SEWAGE NUTRIENTS. CONSUMING THEM BY ADSORPTION AND ABSORPTION THE FLOW OF INFLUENT THROUGH EACH BRANCH OF THE MANIFOLD IS SPEARATELY CONTROLLED SO AS TO MAINTAIN THE NUTRIENT FEED LEVEL OF THE MIXED LIQUOR UNIFORM THROUGHOUT THE TANK. THE MIXED LIQUOR PASSES FROM THE AERATION TANK TO A CLARIFIER WHICH IS ALSO MAINTAINED AT THE SAME PRESSURE AS THE TREATMENT TANK. D R A W I N G
Inventors
- 👤 Richard W Heil
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-01 | 1974-08-03 | 1975-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-01 | 1978-08-03 | 1979-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-01 | 1982-08-03 | 1983-02-02 | $7700.00 | Window Closed / Lapsed |