Patent US3820659A successfully refreshed from Google Patents.
US3820659A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dissolved air clarifier
Assignee: LOVE AND ASS Ltd L
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Filing: 1973-02-20
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Granted: 1974-06-28
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Expires: 1993-02-20
Abstract
Abstract A two stage clarifier having an outer annular laminar flow gravity clarifier tank encircling an inner circular dissolved air flotation clarifier tank, both tanks sharing a common wall. A common drive mechanism drives a sludge scraper in the outer tank and a scum skimmer in each tank. Part of the clarified effluent from the outer tank is gravity fed to the inner tank; the remainder is gravity fed to a pressure tank, pressurized with air, and discharged by air pressure, without pumps, into the inner tank through a conduit having a pressure relief valve at an end in the inner tank. Since the air pressure is released in the inner tank rather than in the conduit, the flotation efficiency is improved.
Inventors
- 👤 J Parlette
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:36
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/24; B; B01; B01D; B01D21/00; B01D21/10; B01D21/12; B01D21/14; B01D21/16; B01D21/24; B01D21/2433; B03; B03D; B03D1/00; B03D1/14; B03D1/1406; B03D1/1431; B03D1/24; B03D1/247
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
181 words
A combined gravity separation and dissolved air flotation clarifier comprising: a. an inner flotation tank, b. an outer gravity clarifier tank encircling said inner tank, c. sludge scraping means for removing settled sludge from said outer tank, d. means for introducing liquid to be clarified into said outer tank, e. a launder in said outer tank for removing clarified liquid from the top of said outer tank, f. a second launder in said inner tank, said second launder being located at a level substantially below that of said first launder, g. first conduit means for removing by gravity a first portion of clarified liquid from said first launder, h. second conduit means for conducting by gravity to said inner tank the remainder of the clarified liquid from said first launder, i. means for dissolving air at substantial pressure in said first portion of the clarified liquid, thereby producing pressurized aerated liquid, j. means for introducing said pressurized aerated liquid into said inner tank, for said air to float particles therein, k. and means for removing clarified liquid from said second launder.
Claim 2
Dependent Claim
181 words
A combined gravity separation and dissolved air flotation clarifier comprising: a. an inner flotation tank, b. an outer gravity clarifier tank encircling said inner tank, c. sludge scraping means for removing settled sludge from said outer tank, d. means for introducing liquid to be clarified into said outer tank, e. a launder in said outer tank for removing clarified liquid from the top of said outer tank, f. a second launder in said inner tank, said second launder being located at a level substantially below that of said first launder, g. first conduit means for removing by gravity a first portion of clarified liquid from said first launder, h. second conduit means for conducting by gravity to said inner tank the remainder of the clarified liquid from said first launder, i. means for dissolving air at substantial pressure in said first portion of the clarified liquid, thereby producing pressurized aerated liquid, j. means for introducing said pressurized aerated liquid into said inner tank, for said air to float particles therein, k. and means for removing clarified liquid from said second launder.
Claim 3
Dependent Claim
33 words
Apparatus according to claim 1 wherein each of said tanks includes scum skimmer means, said apparatus including common power means for driving said scum skimmer means of each tank and said sludge scraper.
Claim 4
Dependent Claim
80 words
Apparatus according to claim 2 wherein said means for introducing said pressurized aerated liquid into said flotation tank includes a conduit extending into said flotation tank and terminating at an end located in said flotation tank, means for admitting said pressurized aerated liquid into said conduit, and a pressure relief valve in said end of said conduit for maintaining liquid in said conduit under pressure and for releasing such pressure only when such liquid is released into said flotation tank.
Claim 5
Dependent Claim
89 words
Apparatus according to claim 3 wherein said means for dissolving air includes an aeration tank, means for conducting by gravity said remainder of said clarified liquid to said aeration tank, means for selectively admitting compressed air to said aeration tank to produce said pressurized aerated liquid, said means for introducing comprising means for selectively connecting said aeration tank to said conduit, so that said pressurized aerated liquid is propelled from said aeration tank into said flotation tank solely by the pressure in said aeration tank and in said conduit.
Claim 6
Dependent Claim
86 words
Apparatus according to claim 4 wherein said pressure relief valve comprises a valve casing mounted at said end of said conduit, a valve member mounted in said valve casing and co-operating therewith for movement vertically between a first position in which said valve is closed and a second position in which said valve is open, a vertically oriented control shaft connected to said valve member and extending upwardly therefrom through said flotation tank, and control means connected to said shaft for adjustment of said relief valve.
Claim 7
Dependent Claim
39 words
Apparatus according to claim 5 wherein said valve casing includes a cone-shaped member opening upwardly, and said valve member is cone-shaped, whereby axial movement of said valve member in said cone-shaped member will vary the opening of said valve.
Claim 8
Dependent Claim
105 words
Apparatus according to claim 5 wherein said valve member and said valve casing are both cylindrical, said valve member fitting snugly but slidably in said valve casing, said valve member having a plurality of V-shaped grooves in its outer surface, said V-shaped grooves being oriented vertically and tapering inwardly from the bottom to the top of said valve member and being closed at the top of said valve member, so that as said valve member is raised in said valve casing, the area of the portion of said grooves aligned with the top of said casing will increase, thereby increasing the opening of said valve.
Claim 9
Dependent Claim
35 words
Apparatus according to claim 1 wherein said means (d) includes means for introducing said liquid to be clarified into said outer tank in a path for laminar flow around the circumference of said outer tank.
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) | 1977-06-27 | 1977-12-27 | 1978-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-27 | 1981-12-27 | 1982-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-27 | 1985-12-27 | 1986-06-28 | $7700.00 | Window Closed / Lapsed |