Apparatus for treating waste materials
Abstract
Abstract The method of treating waste materials, such as sewage, involves introducing raw sewage into a body of aqueous medium, aerating said body of aqueous medium to maintain solids in suspension and to effect B.O.D. removal, withdrawing a sufficient volume of liquid containing a minor amount of solids for discharge as a surcharge free sewage disposal effluent to compensate for the volume of influent waste material in order to maintain a relatively constant volume for said body of aqueous medium, said withdrawn liquid being the filtrate which has passed through a movable filter subject to submerged surface cleaning so that the filter medium while submerged in said body of aqueous medium is being maintained substantially free of solids that normally would accumulate on the filter medium during the filtration of the solids suspension and prevent loss of filtration capacity by directing streams of fluid medium against the outer surface of the filter medium as it passes through the body of aqueous medium.
Inventors
- 👤 R Davidson
- 👤 F Sako
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) | 1976-01-30 | 1976-07-31 | 1977-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-30 | 1980-07-31 | 1981-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-30 | 1984-07-31 | 1985-01-30 | $7700.00 | Window Closed / Lapsed |