US4026802A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Waste water treatment apparatus by biological action
Assignee: Unitika Ltd
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Filing: 1976-08-18
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Granted: 1977-05-31
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Expires: 1996-08-18
Abstract
Abstract A biological waste water treating apparatus in which plural cylindrical filter beds suspended on an endless chain and the like at definite intervals are circulated in a treating tank containing waste water to perform the aerobic treatment of the waste water or aerobic treatment and anaerobic treatment of the waste water. Washing of the filter beds is carried out effectively without stopping the operation.
Inventors
- 👤 Kiyosi Akae
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:00
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/02; C02F3/08; C02F3/082; C02F3/12; C02F3/1278; C02F3/1294; C02F3/20; C02F3/22; C02F3/223; Y; Y02; Y02W; Y02W10/00; Y02W10/10
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
243 words
A waste water treatment apparatus of the type having, a treatment tank including a water outlet and overflow means for determining the maximum water level in said tank, means for applying waste water to said tank, and biologically active filters in said tank for treating the waste water, the improvement comprising, (a) said filters comprising a plurality of individual filter beds, (b) a longitudinal partition centrally located in said tank, (c) means connected to said filters for holding said filters separate from one another, said means comprising an endless chain to which said filter beds are swingably attached, and means for rotating said plurality of filters in said tank around said partition, said endless chain being positioned relative to said tank that some of said filter beds are above said maximum water level of said tank at any given time, (d) means for causing the water in said tank to circularize around said partition, said means comprising a bubble diffuser having an inlet port near the bottom of said tank on one side of said partition to inject bubbles into said tank on said one side, whereby the rise of said bubbles causes upward movement of said water on said one side and downward movement on the other side of said partition, and (e) means, positioned above said maximum water level of said tank, for washing said filter beds during a portion of the time they are rotating out of said water tank.
Claim 2
Dependent Claim
243 words
A waste water treatment apparatus of the type having, a treatment tank including a water outlet and overflow means for determining the maximum water level in said tank, means for applying waste water to said tank, and biologically active filters in said tank for treating the waste water, the improvement comprising, (a) said filters comprising a plurality of individual filter beds, (b) a longitudinal partition centrally located in said tank, (c) means connected to said filters for holding said filters separate from one another, said means comprising an endless chain to which said filter beds are swingably attached, and means for rotating said plurality of filters in said tank around said partition, said endless chain being positioned relative to said tank that some of said filter beds are above said maximum water level of said tank at any given time, (d) means for causing the water in said tank to circularize around said partition, said means comprising a bubble diffuser having an inlet port near the bottom of said tank on one side of said partition to inject bubbles into said tank on said one side, whereby the rise of said bubbles causes upward movement of said water on said one side and downward movement on the other side of said partition, and (e) means, positioned above said maximum water level of said tank, for washing said filter beds during a portion of the time they are rotating out of said water tank.
Claim 3
Dependent Claim
36 words
A waste water treatment apparatus as claimed in claim 1 wherein said means for rotating said plurality of filter beds is adapted to rotate said filter beds in opposing direction to the circulation of said water.
Claim 4
Dependent Claim
52 words
A waste water treatment apparatus as claimed in claim 1 further comprising means for limiting the amount of dissolved oxygen in said water, due to said bubbles, from reaching said other side, whereby an aerobic treatment section and an anaerobic treatment section are provided on said one side and other side, respectively.
Claim 5
Dependent Claim
83 words
A waste water treatment apparatus as claimed in claim 3 wherein said means for limiting comprises a cavity defined by said partition and existing therein, an openable draft near the top of said partition on said one side and an opening near the bottom of said partition on said one side, both said draft and opening communicating with said cavity whereby part of the water upwardly moving on said one side can be selectively passed through said cavity back to said one side.
Claim 6
Dependent Claim
116 words
A waste water treatment apparatus as claimed in claim 4 wherein said bubble diffuser comprises, a water circulation path between said inlet port for injecting bubbles and a tank outlet port, a pump means in said path for transferring tank water from said outlet port to said inlet port, an air introducing means located in said path for introducing air bubbles into said water flowing through said path, said an introducing means having air introducing openings therein and being positioned so that tank water is forced by said pump to form a high speed liquid stream which passes over said air introducing holes in a shearing direction relative to the direction of air through said holes.
Claim 7
Dependent Claim
116 words
A waste water treatment apparatus as claimed in claim 1 wherein said bubble diffuser comprises, a water circulation path between said inlet port for injecting bubbles and a tank outlet port, a pump means in said path for transferring tank water from said outlet port to said inlet port, an air introducing means located in said path for introducing air bubbles into said water flowing through said path, said air introducing means having air introducing openings therein and being positioned so that tank water is forced by said pump to form a high speed liquid stream which passes over said air introducing holes in a shearing direction relative to the direction of air through said holes.
Claim 8
Dependent Claim
17 words
A waste water treatment apparatus as claimed in claim 1 wherein said filter beds are cylindrically shaped.
Claim 9
Dependent Claim
34 words
A waste water treatment apparatus as claimed in claim 1 further comprising means for maintaining said filter beds wet with feed water when they are rotating out of said tank but not being washed.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-30 | 1980-11-29 | 1981-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-30 | 1984-11-29 | 1985-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-30 | 1988-11-29 | 1989-05-31 | $7700.00 | Window Closed / Lapsed |