US3953328A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separation of sludge
Assignee: Individual
•
Filing: 1974-09-04
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Granted: 1976-04-27
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Expires: 1994-09-04
Abstract
Abstract A method for the separation of sludge in which a rising stream of liquid bearing suspended material is established in a clarifying trough and concentrated suspended material is drawn off by suction at that zone in the trough where the tendency of the material to sink owing to gravity is substantially the same as its tendency to be carried upwards in the stream, part of the drawn off material being fed back to an aeration chamber.
Inventors
- 👤 Wilhelm Aldag
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:38
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/02; C02F3/12; B; B03; B03B; B03B9/00; B03B9/06; Y; Y02; Y02W; Y02W10/00; Y02W10/10; Y02W30/00; Y02W30/50; Y02W30/52
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
182 words
A method for the separation of sludge, suspended material and the like from liquid to be purified, comprising the steps of causing the liquid to flow through an aeration chamber into a clarifying chamber; establishing a rising stream of liquid in the clarifying chamber in such a manner as to have a speed of flow which decreases as the liquid rises; permitting suspended microbiological and other material in the rising stream to undergo concentration in an intermediate zone of the clarifying chamber in which the tendency of the said material to sink owing to gravity is substantially the same as its tendency to be carried upwards in the stream; drawing off the concentrated material at the said intermediate zone by suction means and at least in part feeding it back to and introducing it to the upper zone of the aeration chamber; varying the disposition of the suction means to the level where the intermediate zone of concentration occurs; and carrying off the liquid of the rising stream from the clarifying chamber through an outlet at a level above the said zone.
Claim 2
Independent Claim
182 words
A method for the separation of sludge, suspended material and the like from liquid to be purified, comprising the steps of causing the liquid to flow through an aeration chamber into a clarifying chamber; establishing a rising stream of liquid in the clarifying chamber in such a manner as to have a speed of flow which decreases as the liquid rises; permitting suspended microbiological and other material in the rising stream to undergo concentration in an intermediate zone of the clarifying chamber in which the tendency of the said material to sink owing to gravity is substantially the same as its tendency to be carried upwards in the stream; drawing off the concentrated material at the said intermediate zone by suction means and at least in part feeding it back to and introducing it to the upper zone of the aeration chamber; varying the disposition of the suction means to the level where the intermediate zone of concentration occurs; and carrying off the liquid of the rising stream from the clarifying chamber through an outlet at a level above the said zone.
Claim 3
Dependent Claim
56 words
A method as defined in claim 1 wherein the flow of liquid from the aeration chamber is from the lower portion of the aeration chamber into the bottom of the clarification chamber and the said zone where drawing off of the concentrated material occurs is above the entry from the aeration chamber to the clarification chamber.
Claim 4
Independent Claim
223 words
An apparatus for use in separation of sludge, suspended material and the like from liquid to be purified, comprising: an aeration chamber provided with means for aerating liquid therein; a clarifying chamber in fluid communication with the aeration chamber for receiving the liquid therefrom in a rising stream and said clarifying chamber being so shaped that the speed of flow of said stream decreases as the liquid rises; an outlet for clarified liquid disposed at an upper level of the clarifying chamber; at least one pump with an outlet disposed in the aeration chamber and with a suction pipe arranged with its inlet in the clarifying chamber at an intermediate level below the said outlet level and above the fluid communication between the two chamber, the level of the said suction pipe inlet being such that suspended microbiological and other material in the rising stream, which material concentrates at an intermediate zone where its tendency to sink owing to gravity is substantially the same as its tendency to be carried upwards in the stream, is drawn off from the clarifying chamber by the pump for at least partial return into an upper level of the aeration chamber; and means connected to said suction pipe providing that it may be displaceable to a desired intermediate level whereat said intermediate zone of concentrated material occurs.
Claim 5
Independent Claim
223 words
An apparatus for use in separation of sludge, suspended material and the like from liquid to be purified, comprising: an aeration chamber provided with means for aerating liquid therein; a clarifying chamber in fluid communication with the aeration chamber for receiving the liquid therefrom in a rising stream and said clarifying chamber being so shaped that the speed of flow of said stream decreases as the liquid rises; an outlet for clarified liquid disposed at an upper level of the clarifying chamber; at least one pump with an outlet disposed in the aeration chamber and with a suction pipe arranged with its inlet in the clarifying chamber at an intermediate level below the said outlet level and above the fluid communication between the two chamber, the level of the said suction pipe inlet being such that suspended microbiological and other material in the rising stream, which material concentrates at an intermediate zone where its tendency to sink owing to gravity is substantially the same as its tendency to be carried upwards in the stream, is drawn off from the clarifying chamber by the pump for at least partial return into an upper level of the aeration chamber; and means connected to said suction pipe providing that it may be displaceable to a desired intermediate level whereat said intermediate zone of concentrated material occurs.
Claim 6
Dependent Claim
17 words
An apparatus as defined in claim 3, wherein a plurality of pumps and suction pipes are provided.
Claim 7
Dependent Claim
28 words
An apparatus as defined in claim 4, wherein the suction pipes are connected together in such a manner that they are all adjustable to the desired level simutaneously.
Claim 8
Dependent Claim
24 words
An apparatus as defined in claim 3, wherein the clarifying chamber is of upwardly widening shape, whereby to establish said decreasing speed of flow.
Claim 9
Dependent Claim
72 words
An apparatus as defined in claim 6, wherein the aeration chamber and the clarifying chamber are formed by partial subdivision of a larger common chamber by means of a vertical or inclined separating wall which does not extend as far as the bottom of the said common chamber, and wherein the suction pipes are carried by the separating wall in such a manner that their level in the clarifying chamber is adjustable.
Claim 10
Dependent Claim
46 words
An apparatus as defined in claim 6, wherein the separating wall is in the form of a synthetic plastics sheet which is continuously cleaned as a result of the vibration which it experiences, caused by the aeration and flow of the liquid in the aeration chamber.
Claim 11
Dependent Claim
42 words
An apparatus as defined in claim 6, wherein the separating wall of the clarifying chamber is so arranged that a conceptual extension of it does not intersect the bottom of the aeration chamber, but intersects a side wall of the aeration chamber.
Claim 12
Dependent Claim
46 words
An apparatus as defined in claim 3, wherein the inner walls of the clarifying chamber, over at least part thereof, are provided with coatings of a material which resists adhesion of the suspended material being treated, whereby to avoid the turbulence caused by such adhered material.
Claim 13
Dependent Claim
48 words
An apparatus as defined in claim 3, and comprising means for establishing a screening layer of gas over at least part of the inner walls of the clarifying chamber, whereby to reduce adhesion of the material being treated and thus avoid the turbulence caused by such adhered material.
Claim 14
Dependent Claim
53 words
An apparatus as defined in claim 3, wherein control means are provided for detecting the speed of flow of the liquid in the clarifying chamber and adjusting said suction pipes so that their inlets are disposed at the optimum level, the said level being related to the speed of flow of the liquid.
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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) | 1979-04-27 | 1979-10-27 | 1980-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-27 | 1983-10-27 | 1984-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-27 | 1987-10-27 | 1988-04-27 | $7700.00 | Window Closed / Lapsed |