Patent US3662890A successfully refreshed from Google Patents.
US3662890A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Waste treatment system
Assignee: Environmental Services Inc
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Filing: 1970-10-19
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Granted: 1972-05-16
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Expires: 1990-10-19
Abstract
Abstract A system and method of treating contaminated liquid, such as domestic waste liquid in a septic tank, by progressively withdrawing part of the liquid into a closed chamber and aerating it under pressure to permeate it extensively with clean ambient air, and discharging the saturated liquid into the septic tank, or other type of tank if different waste liquid from domestic waste is being treated, to enhance the reduction of B.O.D. and/or C.O.D. of said liquid prior to discharge from the tank.
Inventors
- 👤 Derald E Grimshaw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:56
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/02; C02F3/12; C02F3/1236; C02F3/1242; C02F3/26; C02F3/28; Y; Y02; Y02W; Y02W10/00; Y02W10/10; Y10; Y10S; Y10S261/00; Y10S261/75
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
210 words
A system for treating waste liquids to reduce the B.O.D. thereof comprising in combination, a tank having inlet means adjacent one end to receive contaminated liquid to be treated and an outlet adjacent the opposite end for discharging treated liquid; a mixing unit in combination with said tank comprising a closed chamber of limited capacity substantially less than said tank and having inlet and discharge means, a pump, an air compressor, conduit means connecting said pump to said tank to withdraw contaminated liquid therefrom and discharge it into said closed chamber at a predetermined rate, a perforated sparger extending longitudinally into said closed chamber through one end of said closed chamber, and additional conduit means extending from said compressor to the inlet means of said sparger to deliver compressed air thereto for discharge from said sparger into said closed chamber to aerate said contaminated liquid therein to a desired degree while increasing the pressure of said liquid within said chamber; and discharge conduit means connected to said discharge means on said closed chamber and directed into said tank to deliver highly aerated liquid thereto under pressure to effect aeration of said contaminated liquid in said tank at increased efficiency and thereby substantially effect and accelerate the reduction of B.O.D. thereof.
Claim 2
Independent Claim
210 words
A system for treating waste liquids to reduce the B.O.D. thereof comprising in combination, a tank having inlet means adjacent one end to receive contaminated liquid to be treated and an outlet adjacent the opposite end for discharging treated liquid; a mixing unit in combination with said tank comprising a closed chamber of limited capacity substantially less than said tank and having inlet and discharge means, a pump, an air compressor, conduit means connecting said pump to said tank to withdraw contaminated liquid therefrom and discharge it into said closed chamber at a predetermined rate, a perforated sparger extending longitudinally into said closed chamber through one end of said closed chamber, and additional conduit means extending from said compressor to the inlet means of said sparger to deliver compressed air thereto for discharge from said sparger into said closed chamber to aerate said contaminated liquid therein to a desired degree while increasing the pressure of said liquid within said chamber; and discharge conduit means connected to said discharge means on said closed chamber and directed into said tank to deliver highly aerated liquid thereto under pressure to effect aeration of said contaminated liquid in said tank at increased efficiency and thereby substantially effect and accelerate the reduction of B.O.D. thereof.
Claim 3
Dependent Claim
40 words
The system according to claim 1 in which said closed chamber is cylindrical at least at the inlet end thereof and said means to introduce liquid into said chamber being arranged tangentially with said cylindrical inlet end of said chamber.
Claim 4
Dependent Claim
102 words
The system according to claim 1 in which at least the portion of said closed chamber adjacent one end is cylindrical and said end of said chamber having said liquid inlet connected thereto, said liquid inlet extending tangentially to the axis of said cylindrical portion of said chamber and said sparger for said compressed air also being connected to the same end of said cylinder substantially coaxially with the axis thereof, whereby the liquid entering said chamber tangentially swirls around said sparger and thereby enhances the mixing of the liquid with said air delivered under pressure by said sparger into said liquid.
Claim 5
Dependent Claim
72 words
The system according to claim 1 in which said tank is a treatment tank adapted to be disposed below ground level, said mixing unit including supporting means adapted to be mounted above said treatment tank at a level no lower than ground level, whereby said mixing unit is readily available for servicing and observation of operation thereof, and said conduit means extending from said mixing unit to and from said treatment tank.
Claim 6
Dependent Claim
130 words
The system according to claim 4 further including an additional treatment tank adapted to be disposed below ground level adjacent the discharge end of said first mentioned treatment tank and connected to said discharge end thereof to receive pre-treated liquid from said tank, and additional air discharge means disposed within said additional treatment tank adjacent the bottom thereof, said additional air discharge means being connected to said air compressor to receive air under pressure therefrom and discharge the same into said additional treatment tank to further enchance the aeration of the treated liquid received from said first mentioned treatment tank and thereby further reduce the B.O.D. thereof, said additional treatment tank having a discharge outlet in one end for the discharge of such further treated liquid from the entire system.
Claim 7
Dependent Claim
83 words
The system according to claim 5 further including a still further treatment tank adapted to be disposed between said first mentioned treatment tank and said additional treatment tank, and an additional mixing unit connected by inlet and discharge conduits to said additional treatment tank, said still further treatment tank also having an inlet to receive pre-treated liquid discharged from said first mentioned treatment tank and said additional treatment tank being positioned and arranged to discharge additionally treated liquid into said additional treatment tank.
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) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |