US3559807A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sewage treating apparatus and method
Assignee: Individual
•
Filing: 1969-06-26
•
Granted: 1971-02-02
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Expires: 1989-06-26
Abstract
Abstract A method and apparatus for separating and drying sewage sludge by filtering an aqueous slurry of sludge through a filter medium on a travelling foraminous conveyor to deposite a layer of sludge on the filter medium and passing the conveyor and filter medium with a sludge deposit through a drying chamber where the sludge is dried by downdraft flow of hot gases and the filter medium and sludge deposit subsequently removed from the conveyor and the conveyor returned for application of fresh filter medium and recycle. Preferably the filter medium and sludge are removed from the conveyor by passage through a furnace where they are burned and the resulting hot combustion gases fed to the drying chamber.
Inventors
- 👤 Bertram B Reilly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:36
CPC Classifications
C; C02; C02F; C02F11/00; C02F11/12; C02F11/121; C02F11/123; B; B01; B01D; B01D33/00; B01D33/04; B01D37/00; C02F11/13
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
49 words
Sewage processing apparatus as defined in claim 1 wherein the foraminous conveyor is so arranged and supported within the filtering unit as to retain a pool of sewage on the conveyor and its overlying web of filtering material in the area between the two ends of the filtering unit.
Claim 2
Dependent Claim
37 words
Sewage processing apparatus as defined in claim 2 wherein the end portions of the foraminous conveyor adjacent the two ends of the filtering unit are higher than the intervening span of the conveyor to provide said pool.
Claim 3
Dependent Claim
42 words
Sewage processing means as defined in claim 1 wherein the filtering unit has means for maintaining a subatmospheric pressure therein below the conveyor to accelerate the flow of liquid through the web and conveyor while they are passing through the filtering unit.
Claim 4
Dependent Claim
99 words
Filtering apparatus as defined in claim 1 wherein the filtering unit has an elongated liquid receiving means under the conveyor, for receiving the liquid that passes through the web and conveyor, said liquid receiving means having a transverse divider spaced from the ends thereof whereby the liquid which passes through the filtering web and conveyor at the entering end of the filtering unit is separated from the other liquid that passes through the web and conveyor beyond said divider, and means for recycling the liquid so collected from under the entering end of the conveyor to the input sewage.
Claim 5
Dependent Claim
30 words
Sewage treating apparatus as defined in claim 1 wherein there is a combustion apparatus following the drier in which the expendable filtering medium and dried deposit carried thereby are burned.
Claim 6
Dependent Claim
61 words
Sewage treating apparatus as defined in claim 6 wherein hot gases generated in said combustion apparatus are circulated to the drier to flow down through the material on the web and through the web and the conveyor, there being means under the conveyor for collecting and exhausting said gases after they have passed through the solids, the web and the conveyor.
Claim 7
Dependent Claim
125 words
A sewage disposal method comprising: a. continuously applying a continuous web of unused expendable filtering medium to an endless traveling foraminous conveyor; b. continuously flowing the sewage to be processed as an aqueous slurry onto said web and removing most of the water phase through the web and supporting conveyor while depositing a layer of sludge on the web; c. continuously thereafter forcing hot drying gases downwardly through the layer of sludge, the web, and the foraminous conveyor to dry the sludge; d. continuously burning the web and sludge and returning the foraminous conveyor free of all deposit to a position to receive the web; and e. utilizing heat from burning the web and sludge for effecting the downdraft drying of the sludge and wedge.
Claim 8
Dependent Claim
97 words
The sewage disposal method comprising: a. separating the solids from an aqueous slUrry on a continuous filter web of expendable material while the web is supported on and carried with a traveling foraminous conveyor; b. thereafter forcing hot drying gases downdraft through the traveling conveyor and the web and solids carried thereby; c. burning the filtering web and solids thereon following the drying step and utilizing the heat of combustion to tp provide hot gases for the drying step; and d. returning the foraminous conveyor free of the web and solids to receive a fresh filtering web.
Claim 9
Dependent Claim
36 words
A method as defined in claim 9 wherein the dried sludge and filtering web are burned in a furnace enclosure while said filtering web and the dried sludge thereon are still supported on the foraminous conveyor.
References 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 |