Treatment of wastewater
Abstract
Abstract PROCESS AND APPARATUS FOR THE OXIDATION OF CARBONACEOUS AND NITROGENOUS MATTER IN WASTEWATER BY USE OF A MIXTURE OF BIOLOGICALLY ACTIVE SLIMES ATTACHED TO PARTIALLY SUBMERGED ROTATING CONTACTORS. THE BIOLOGICAL CONTACTORS ARE MOUNTED IN A SINGLE-STAGE TREATMENT UNIT AND ARE SUPPLIED WITH WASTEWATER AT A CONTROLLED RATE RELATIVE TO THE SURFACE OF THE CONTACTORS AND DISTRIBUTED SUBSTANTIALLY EVENLY OVER THE CONTACTOR SURFACE. A DENITRIFYING UNIT, LOCATED UPSTREAM FROM THE SINGLE-STAGE TREATMENT UNIT IS SUPPLIED WITH WASTEWATER AND RECIRULATED EFFLUENT FROM THE SINGLE-STAGE TREATMENT UNIT. THE DENITRIFYING UNIT UTILIZES BIOLOGICALLY ACTIVE SLIMES ATTACHED TO ROTATING BIOLOGICAL CONTACTORS FOR THE REMOVAL OF CARBONACEOUS MATTER FROM THE WASTEWATER SUPPORTED BY NITRATE OXYGEN FROM THE RECIRCULATED EFFLUENT.
Inventors
- 👤 W Torpey
Bibliographic Details
Claims Analysis
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1977-06-17 | 1977-12-17 | 1978-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-17 | 1981-12-17 | 1982-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-17 | 1985-12-17 | 1986-06-18 | $7700.00 | Window Closed / Lapsed |