Patent US3917532A successfully refreshed from Google Patents.
US3917532A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sewage treatment plant
Assignee: Davis Water and Waste Industries Inc
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Filing: 1974-04-11
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Granted: 1975-11-04
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Expires: 1994-04-11
Abstract
Abstract A package sewage treatment plant, of the type having concentric inner and outer tank walls, includes an intermediate concentric wall between the inner and outer walls. The intermediate wall supports aeration piping and air diffusers for providing oxygen to and mixing of the sewage on both sides of the intermediate wall. The use of the intermediate wall makes possible the extension in size of ''''package'''' sewage treatment plants since the effective distance that rolling or mixing of the liquid can be maintained is increased. The intermediate wall also prevents short-circuiting of the sewage from the inlet to the settling tank.
Inventors
- 👤 Donald A King
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:52
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/02; C02F3/12; C02F3/1236; C02F3/1242; C02F3/1247; B; B01; B01D; B01D21/00; B01D21/02; B01D21/04; B01D21/06; B01D21/24; B01D21/2427; C02F3/20; Y; Y02; Y02A; Y02A20/00; Y02A20/20; Y02A20/208; Y02W; Y02W10/00; Y02W10/10
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
147 words
A SEWAGE TREATMENT PLANT COMPRISING: A. AN OUTER CURVED WALL AND AN INNER CURVED SETTLING TANK WALL DEFINING AN AERATION SECTION THEREBETWEEN, SAID WALLS HAVING A COMMON CENTER, B. MEANS FOR FACILITATING SEWAGE CAPACITY OF SAID PLANT WHILE PROVIDING ADEQUATE MIXING OF SEWAGE BY AIR INJECTED INTO THE SEWAGE SAID MEANS INCLUDING (I) A CURVED INTERMEDIATE WALL LOCATED BETWEEN SAID INNER AND OUTER WALLS IN SAID AERATION SECTION, SAID INTERMEDIATE WALL HAVING A COMMON CENTER WITH SAID INNER AND OUTER WALLS AND HAVING INNER AND OUTER SURFACES THEREOF FACING, RESPECITIVELY, SAID INNER AND OUTER WALLS, (II) AIR DIFFUSER MEANS FOR PROVIDING ROLLING OF SEWAGE IN SAID AERATION SECTION, FROM THE INTERMEDIATE WALL TOWARD THE OUTER WALL AND FROM THE INTERMEDIATE WALL TOWARD THE INNER WALL, SAID AIR DIFFUSE MEANS INCLUDING A PLURALITY OF AIR DIFFUSERS MOUNTED ON BOTH SAID INNER AND OUTER SURFACES OF SAID INTERMEDIATE WALL.
Claim 2
Dependent Claim
147 words
A SEWAGE TREATMENT PLANT COMPRISING: A. AN OUTER CURVED WALL AND AN INNER CURVED SETTLING TANK WALL DEFINING AN AERATION SECTION THEREBETWEEN, SAID WALLS HAVING A COMMON CENTER, B. MEANS FOR FACILITATING SEWAGE CAPACITY OF SAID PLANT WHILE PROVIDING ADEQUATE MIXING OF SEWAGE BY AIR INJECTED INTO THE SEWAGE SAID MEANS INCLUDING (I) A CURVED INTERMEDIATE WALL LOCATED BETWEEN SAID INNER AND OUTER WALLS IN SAID AERATION SECTION, SAID INTERMEDIATE WALL HAVING A COMMON CENTER WITH SAID INNER AND OUTER WALLS AND HAVING INNER AND OUTER SURFACES THEREOF FACING, RESPECITIVELY, SAID INNER AND OUTER WALLS, (II) AIR DIFFUSER MEANS FOR PROVIDING ROLLING OF SEWAGE IN SAID AERATION SECTION, FROM THE INTERMEDIATE WALL TOWARD THE OUTER WALL AND FROM THE INTERMEDIATE WALL TOWARD THE INNER WALL, SAID AIR DIFFUSE MEANS INCLUDING A PLURALITY OF AIR DIFFUSERS MOUNTED ON BOTH SAID INNER AND OUTER SURFACES OF SAID INTERMEDIATE WALL.
Claim 3
Dependent Claim
39 words
A sewage treatment plant as recited in claim 1 wherein said air diffuser means further include air header means for supplying air to said plurality of air diffusers, said air header means mounted on top of said intermediate wall.
Claim 4
Dependent Claim
36 words
A sewage treatment plant as recited in claim 2 wherein said means for providing limited sewage communication includes said intermediate wall and portions of said intermediate wall remote from said settling tank influent having apertures therein.
Claim 5
Dependent Claim
21 words
A sewage treatment plant as recited in claim 3 wherein said inner, intermediate and outer walls define circumferences of concentric circles.
Claim 6
Dependent Claim
19 words
A sewage treatment plant as recited in claim 4 wherein said intermediate wall is formed from arcuate wall members.
Claim 7
Dependent Claim
33 words
A sewage treatment plant as recited in claim 1 wherein said inner and outer walls also form a digester section therebetween, said intermediate wall extending up to but not into said digester section.
Claim 8
Dependent Claim
38 words
A sewage treatment plant as recited in claim 6 wherein a chlorine contact tank is additionally formed by walls between said inner and outer walls, said intermediate wall extending up to but not into said chlorine contact tank.
Claim 9
Dependent Claim
40 words
A sewage treatment plant as recited in claim 6 wherein said inner, intermediate and outer walls define circumferences of concentric circles, said digester section being separated from said aeration section by walls radially extending between said inner and outer walls.
Claim 10
Dependent Claim
28 words
A sewage treatment plant as recited in claim 1 wherein said air diffusers are mounted near but spaced from the bottom of said plant and said intermediate wall.
Claim 11
Dependent Claim
36 words
A sewage treatment plant as recited in claim 1 wherein said means for providing limited sewage communication includes said intermediate wall and portions of said intermediate wall remote from said settling tank influent having apertures therein.
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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) | 1978-11-03 | 1979-05-05 | 1979-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-03 | 1983-05-05 | 1983-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-03 | 1987-05-05 | 1987-11-04 | $7700.00 | Window Closed / Lapsed |