Process and plant for treating sewage
Abstract
Abstract A PROCESS FOR THE TREATMENT OF LIQUID CONTAINING BIODEGRADABLE ORGANIC SOLIDS, AS FOR EXAMPLE, SEWAGE, AND THE LIKE, WHICH, IN GENERAL, COMBINES DESIRABLE FEATURES OF TRICKLING FILTER AND ACTIVATED SLUDGE SYSTEMS AND INCLUDES APPARATUS SUITABLE THEREFOR. A LIQUID CONTAINING BIODEGRADABLE SOLIDS, AS FOR EXAMPLE, SEWAGE AND THE LIKE IS CONSTANTLY RECIRCULATED FROM A SUMP OR AEROBIC LAGOON THROUGH A TRICKLING FILTER, AND EFFLUENT FROM THE TRICKLING FILTER IS MIXED WITH INCOMING RAW SEWAGE WITH AGITATION IN THE SUMP. THE MIXTURE IS THEN RETAINED IN QUIESCENT ZONES BEFORE OVERFLOW EFFLUENT IS REMOVED FROM THE SUMP THUS EFFICIENTLY TREATING BOTH SETTLEABLE SOLIDS AND DISSOLVED SOLIDS CONTAINED IN THE SEWAGE AND THE LIKE. D R A W I N G
Inventors
- 👤 Karl Cring Ayers
- 👤 David Warren Mcananey
Bibliographic Details
Claims Analysis
Total Claims: 0References Cited (Backward Citations)
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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) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |