US3744634A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Package sewage treatment plant
Assignee: Siemens Water Technologies Holding Corp
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Filing: 1971-02-25
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Granted: 1973-07-10
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Expires: 1991-02-25
Abstract
Abstract The self-contained package plant includes an annular aerobic, biological treating channel into which the raw sewage is fed and continually driven around the channel by a plurality of rotating perforated discs which also function to aerate and agitate the contents of the channel. A central, sludge tank is located within the space defined by the channel, and controlled recirculation of activated liquid from the settling tank to the annular channel is effected by one of the discs. The clarified effluent from the settling tank is taken from a weir trough adjustably mounted in the upper portion of the sludge tank.
Inventors
- 👤 H Schlenz
- 👤 N Schlenz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:33
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/02; C02F3/08; C02F3/082; C02F3/12; C02F3/1236; C02F3/1242; Y; Y02; Y02W; Y02W10/00; Y02W10/10
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
164 words
A sewage treatment plant of the package type, comprising a settling tank having a conical bottom wall portion and an upper, cylindrical wall portion, an annular channel surrounding said upper wall portion with said upper wall portion being the inner wall of said channel, said upper wall portion having a plurality of openings therein for transferring sewage from said channel to said settling tank, a circular disc having perforations therein, a horizontally disposed shaft journaled above said channel and on which said disc is fixed to depend into said channel and be partially submerged in the sewage carried thereby, a semi-circular trough mounted in said channel over the lower portion of said disc, a pipe connected between said trough and the lower portion of said tank, motor means for rotating said disc to aerate the sewage in said channel and to recirculate sewage from said tank to said channel, and weir means mounted near the top of said tank for removing clarified liquid therefrom.
Claim 2
Dependent Claim
164 words
A sewage treatment plant of the package type, comprising a settling tank having a conical bottom wall portion and an upper, cylindrical wall portion, an annular channel surrounding said upper wall portion with said upper wall portion being the inner wall of said channel, said upper wall portion having a plurality of openings therein for transferring sewage from said channel to said settling tank, a circular disc having perforations therein, a horizontally disposed shaft journaled above said channel and on which said disc is fixed to depend into said channel and be partially submerged in the sewage carried thereby, a semi-circular trough mounted in said channel over the lower portion of said disc, a pipe connected between said trough and the lower portion of said tank, motor means for rotating said disc to aerate the sewage in said channel and to recirculate sewage from said tank to said channel, and weir means mounted near the top of said tank for removing clarified liquid therefrom.
Claim 3
Dependent Claim
30 words
A sewAge treatment plant according to claim 1 further comprises means pivotally mounting said trough in said channel to adjust the rate at which sewage is recirculated by said disc.
Claim 4
Dependent Claim
28 words
A sewage treatment plant according to claim 2 wherein said trough is pivotally mounted on said pipe whereby said sewage enters said trough along the pivotal axis thereof.
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) | 1976-07-09 | 1977-01-08 | 1977-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-09 | 1981-01-08 | 1981-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-09 | 1985-01-08 | 1985-07-10 | $7700.00 | Window Closed / Lapsed |