Extended aeration wastewater treatment
Abstract
Abstract WITH SLUDGE COMPACTION AND IN THE PREFERRED FORM IS CAPABLE OF BEING FABRICATED FROM PLANER ELEMENTS EITHER AS A COMPLETE UNIT OR INTERNALS FOR INSTALLATION IN OTHER TYPES OF TANKAGE. AN IMPROVED EXTENDED AERATION PROCESS IS CARRIED OUT IN A SINGLE TANK. WASTES ARE AERATED FOR PERIODS RANGING FROM 12 TO 24 HOURS AND ARE CIRCULATED IN THE TANK IN A CONTROLLED MANNER TO AVOID SETTLING AND COMPACTION. THE CONCENTRATION OF MIXED LIQUOR IS MAINTAINED BY THE SELECTIVE REMOVAL OF CLARIFIED EFFLUENT. IN THIS MANNER, THE NECESSITY FOR PROVIDING QUIESCENT ZONES FOR THE SETTLING OF SOLIDS AND FOR RETURNING COMPACTED SLUDGE TO THE AERATION PROCESS IS ELIMINATED. THE INVENTIVE APPARATUS IS OF MODULAR CONSTRUCTION, AVOIDS THE PROBLEMS ASSOCIATED
Inventors
- 👤 Jen T Yang
- 👤 Robert Waller
- 👤 Charles W Mallory
Bibliographic Details
Claims Analysis
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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) | 1975-09-26 | 1976-03-27 | 1976-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-26 | 1980-03-27 | 1980-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-26 | 1984-03-27 | 1984-09-26 | $7700.00 | Window Closed / Lapsed |