Patent US3774768A successfully refreshed from Google Patents.
US3774768A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for treating industrial and domestic waste waters
Assignee: Westinghouse Electric Corp
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Filing: 1972-08-16
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Granted: 1973-11-27
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Expires: 1992-08-16
Abstract
Abstract A system for treating waste waters including a pair of concentric tanks forming a space therebetween which serves as an aeration chamber. Untreated but screened waste water is discharged into the (annular) space and withdrawn therefrom by a pump which passes the liquid through an oxygenating device which induces air into the liquid. The liquid is then circulated through long tubing wound around the outside peripheral surface of the tank to obtain intimate contact between the gas, liquid and solids therein and to convert dissolved material into insoluble material by a conventional biochemical process. The liquid thus processed in the tubing is introduced into the central or inner tank where the treated solids rise to the surface for recycling in the system while the liquid effluent is filtered and discharged to a river or stream.
Inventors
- 👤 A Turner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:11
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/02; C02F3/12; C02F3/1236; C02F3/1242; C02F3/04; C02F3/06; C02F3/10; Y; Y02; Y02W; Y02W10/00; Y02W10/10
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
205 words
A system for treating industrial and domestic sewage comprising: a pair of inner and outer containment vessels forming a digestion tank in the space therebetween; a pipe interconnecting a source of screened sewage in the form of a liquid having suspended solids theRein with the digestion tank; means in said digestion tank for supplying oxygen to said screened liquid; an oxygenating device, a pump interconnecting the digestion tank with said oxygenating device, said device having an air supply inlet which introduces oxidizing gas into the liquid when it is moved therethrough by the pump thereby forming a gas-liquidsolids mixture; means connected to said oxygenating device and positioned to receive the thus formed gas-liquid-solids mixture for facilitating contact between the gas, liquid and solids and for a time which permits conversion of soluble suspended solids in the liquid to insoluble solids; and piping extending between the means receiving the gas-liquidsolids mixture and said inner vessel for supplying the gasliquid-solids mixture to the inner vessel, and a filter in said inner vessel, constructed and arranged so that the solids separate from the liquid and flow into the digestion tank for recirculation in the system and the liquid flows through the filter prior to discharge to a drain.
Claim 2
Independent Claim
205 words
A system for treating industrial and domestic sewage comprising: a pair of inner and outer containment vessels forming a digestion tank in the space therebetween; a pipe interconnecting a source of screened sewage in the form of a liquid having suspended solids theRein with the digestion tank; means in said digestion tank for supplying oxygen to said screened liquid; an oxygenating device, a pump interconnecting the digestion tank with said oxygenating device, said device having an air supply inlet which introduces oxidizing gas into the liquid when it is moved therethrough by the pump thereby forming a gas-liquidsolids mixture; means connected to said oxygenating device and positioned to receive the thus formed gas-liquid-solids mixture for facilitating contact between the gas, liquid and solids and for a time which permits conversion of soluble suspended solids in the liquid to insoluble solids; and piping extending between the means receiving the gas-liquidsolids mixture and said inner vessel for supplying the gasliquid-solids mixture to the inner vessel, and a filter in said inner vessel, constructed and arranged so that the solids separate from the liquid and flow into the digestion tank for recirculation in the system and the liquid flows through the filter prior to discharge to a drain.
Claim 3
Independent Claim
200 words
A system for treating industrial and domestic sewage comprising: a tank having an inlet for receiving screened sewage liquid from a source, said liquid having suspended solids therein; a vessel in said tank; a diffusion tube in said tank connected to a source of air for supplying oxygen to the screened liquid therein; an oxygenating device, a pump connecting an outlet from said tank with said oxygenating device, and means in said device connected to an air source for supplying oxygen to the screened liquid moved therethrough by the pump thereby forming a gas-liquid-solids mixture; conversion means positioned to receive the air-liquid-solids mixture from said device, said means being of a size and configuration sufficient to effect thorough contact between the air and suspended solids to effect conversion of said suspended solids to insoluble solids; and a pipe extending from said conversion means to said vessel to supply the gas-liquid-solids mixture to said vessel and a filter in the bottom of said vessel constructed and arranged to allow the solids which separate from the liquid to flow into said tank for recycling in the system, and the liquid to be discharged through said filter and an outlet to a drain.
Claim 4
Independent Claim
200 words
A system for treating industrial and domestic sewage comprising: a tank having an inlet for receiving screened sewage liquid from a source, said liquid having suspended solids therein; a vessel in said tank; a diffusion tube in said tank connected to a source of air for supplying oxygen to the screened liquid therein; an oxygenating device, a pump connecting an outlet from said tank with said oxygenating device, and means in said device connected to an air source for supplying oxygen to the screened liquid moved therethrough by the pump thereby forming a gas-liquid-solids mixture; conversion means positioned to receive the air-liquid-solids mixture from said device, said means being of a size and configuration sufficient to effect thorough contact between the air and suspended solids to effect conversion of said suspended solids to insoluble solids; and a pipe extending from said conversion means to said vessel to supply the gas-liquid-solids mixture to said vessel and a filter in the bottom of said vessel constructed and arranged to allow the solids which separate from the liquid to flow into said tank for recycling in the system, and the liquid to be discharged through said filter and an outlet to a drain.
Claim 5
Dependent Claim
25 words
The system according to claim 2 wherein said tank is bypassed by a valved pipe which connects said source with the inlet to said pump.
Claim 6
Dependent Claim
34 words
The system according to claim 3 wherein an aerated packed column comprising multiple plastic elements are positioned above said filter in said vessel, said elements comprising a support media for microorganisms in the system.
Claim 7
Dependent Claim
66 words
The system according to claim 2 wherein said oxygenating device comprises a housing having an inlet and an outlet for said liquid, and the means in said device comprises a diffusion tube in the housing through which the liquid flows, a space between said housing and tube; and means connecting said space with an air source for diffusing air through the tube and into said liquid.
Claim 8
Dependent Claim
25 words
The system according to claim 2 wherein said filter comprises sand with an overlayer of carbon which is effective in collecting any remaining suspended solids.
Claim 9
Dependent Claim
39 words
The system according to claim 2 wherein said means positioned to receive the gas-liquid-solids mixture from the oxygenating device comprises a tubular element consisting of a material which is non-corrosive and which is non-inhibiting to microorganisms in the liquid.
Claim 10
Dependent Claim
19 words
The system according to claim 7 wherein said tubing is wrapped around the outer peripheral surface of said tank.
Claim 11
Dependent Claim
28 words
The system according to claim 2 wherein the solids overflowing from the vessel into said tank helps stabilize the suspended solids therein and are recycled in the system.
Claim 12
Dependent Claim
115 words
The system according to claim 2 wherein the liquid discharge outlet in said vessel comprises a screen protected perforated tube having a pipe connected to a drain; a valve in the perfOrated tube pipe for controlling the flow of liquid therethrough; an air line connected at one end to said air source and at its other end to said perforated tube pipe, and a valve in said air line; means connected with said valves for simultaneously operating the same to shut off the flow of liquid through the perforated tube pipe and to open the air line thereby permitting air to flow into said tube for flushing out any solids therein and in said filter.
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) | 1976-11-26 | 1977-05-28 | 1977-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-26 | 1981-05-28 | 1981-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-26 | 1985-05-28 | 1985-11-27 | $7700.00 | Window Closed / Lapsed |