US3923652A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for compacting fluid sludges
Assignee: Cegelec SA
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Filing: 1973-11-28
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Granted: 1975-12-02
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Expires: 1993-11-28
Abstract
Abstract Method for compacting fluid sludges, consisting in stirring mechanically the sludges slowly by means of perforated blades rotating at low speed in a tank and in extracting them from the said tank by pressing by means of a perforated conical screw rotating slowly in a conical housing.
Inventors
- 👤 Elie Condolios
- 👤 Michel Merle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:39
CPC Classifications
C; C02; C02F; C02F11/00; C02F11/12; B; B01; B01D; B01D21/00; B01D21/0018; B01D21/02; B01D21/04; B01D21/06; B01D21/08; B01D21/24; B01D21/245; B01D21/30; B01D21/34; C02F11/14
Claims Analysis
Total Claims: 32
Claim 1
Independent Claim
206 words
A METHOD FOR COMPACTING FLUID SLUDGE INCLUDING FLAKES OF SLUDGE SMALLER THAN A FEW TENTHS OF A MILLIMETER AND AN INTERSITIAL LIQUID, SAID METHOD COMPRISNG: INTRODUCING FLUID SLUDGE INTO A TANK; SEPARATING A PORTION OF THE INTERSTITIAL LIQUID FROM SAID FLUID SLUDGE TO PREDUCE A CONCENTRATIED SLUDGE; STIRRING SAID CONCENTRATED SLUDGE SLOWLY SO THAT THE FLAKES OF SLUDGE IN SAID CONCENTRATED SLUDGE INCREASE IN VOLUME AND DENSITY, STIRRING BEING ACCOMPLISHED BY MEANS OF A PLURALITY OF INCLINED PERFORATED BLADES MOUNTED FOR ROTATION ABOUT A VERICAL SHAFT, THE STIRRING SPEED BEING SO CHOSEN THAT BREAK UP OF FLAKES OF SLUDGE IS SUBSTANTIALLY PREVENTED; PRESSING THE FLAKES OF SLUDGE WHICH HAVE BEEN STIRRED TOWARD A DISCHARGE POINT SO THAT MOVEMENT OF THE FLAKES OF SLUDGE DECREASES AS SAID DISCHARGE POINT IS APPROACHED, SO THAT THE INTERSTITIAL LIQUID BETWEEN THE FLAKES OF SLUDGE IS MOVED AWAY FROM SAID DISCHARGE POINT, AND SO THAT THE FLAKES OF SLUDGE ARE COMPACTED, PRESSING BEING ACCOMPLISHED BY AT LEAST ONE PERFORATED CONICAL SCREW MOUNTED FROM ROTATION ABOUT A VERTICAL SHAFT AND POSITIONED BELOW SAID PERFORATED BLADES; AND REMOVING THE COMPACTED SLUDGE FLAKES AT SAID DISCHARGE POINT, SAID PERFORATED BLADES BEING INCLINED SO AS TO PUSH SAID FLAKES OF SLUDGE TOWARDS SAID CONICAL SCREW.
Claim 2
Independent Claim
206 words
A METHOD FOR COMPACTING FLUID SLUDGE INCLUDING FLAKES OF SLUDGE SMALLER THAN A FEW TENTHS OF A MILLIMETER AND AN INTERSITIAL LIQUID, SAID METHOD COMPRISNG: INTRODUCING FLUID SLUDGE INTO A TANK; SEPARATING A PORTION OF THE INTERSTITIAL LIQUID FROM SAID FLUID SLUDGE TO PREDUCE A CONCENTRATIED SLUDGE; STIRRING SAID CONCENTRATED SLUDGE SLOWLY SO THAT THE FLAKES OF SLUDGE IN SAID CONCENTRATED SLUDGE INCREASE IN VOLUME AND DENSITY, STIRRING BEING ACCOMPLISHED BY MEANS OF A PLURALITY OF INCLINED PERFORATED BLADES MOUNTED FOR ROTATION ABOUT A VERICAL SHAFT, THE STIRRING SPEED BEING SO CHOSEN THAT BREAK UP OF FLAKES OF SLUDGE IS SUBSTANTIALLY PREVENTED; PRESSING THE FLAKES OF SLUDGE WHICH HAVE BEEN STIRRED TOWARD A DISCHARGE POINT SO THAT MOVEMENT OF THE FLAKES OF SLUDGE DECREASES AS SAID DISCHARGE POINT IS APPROACHED, SO THAT THE INTERSTITIAL LIQUID BETWEEN THE FLAKES OF SLUDGE IS MOVED AWAY FROM SAID DISCHARGE POINT, AND SO THAT THE FLAKES OF SLUDGE ARE COMPACTED, PRESSING BEING ACCOMPLISHED BY AT LEAST ONE PERFORATED CONICAL SCREW MOUNTED FROM ROTATION ABOUT A VERTICAL SHAFT AND POSITIONED BELOW SAID PERFORATED BLADES; AND REMOVING THE COMPACTED SLUDGE FLAKES AT SAID DISCHARGE POINT, SAID PERFORATED BLADES BEING INCLINED SO AS TO PUSH SAID FLAKES OF SLUDGE TOWARDS SAID CONICAL SCREW.
Claim 3
Dependent Claim
25 words
The method of claim 1, wherein interstitial liquid moving away from said discharge point as the sludge flakes are pressed moves upwardly through said tank.
Claim 4
Dependent Claim
43 words
The method of claim 1, further comprising adding a flocculating agent to said fluid sludge prior to separating a portion of the interstitial liquid therefrom so that sludge flakes undergo flocculation prior to the separation of a portion of said interstitial liquid therefrom.
Claim 5
Dependent Claim
20 words
The method of clAim 3, wherein flocculation is accomplished in a chamber free of means for mixing said fluid sludge.
Claim 6
Dependent Claim
34 words
The method of claim 1, wherein the stirring speed is so chosen that the maximum speed of any part of the stirring means used to effect stirring is no more than about 10 cm/sec.
Claim 7
Dependent Claim
12 words
The method of claim 1, wherein said perforated blades are horizontally disposed.
Claim 8
Independent Claim
200 words
A device for compacting fluid sludge comprising a cylindrico-conical tank, means defining a flocculation chamber in said cylindrico-conical tank, said flocculation chamber having an outlet in said cylindrico-conical tank, inlet means for transferring fluid sludge to be treated into said flocculation chamber, deflector means positioned at the outlet of said flocculation chamber for producing a concentrated sludge, stirring means for stirring the concentrated sludge so that the flakes of sludge in said concentrated sludge increase in volume and density, the stirring means being disposed in the cylindrical part of said tank below said flocculation chamber and comprising a plurality of inclined perforated blades mounted on a vertical shaft, compacting means located in the conical portion of said tank for compacting sludge and for discharging compacted sludge from an opening in the lower part of said cylindrico-conical tank, said compacting means comprising at least one perforated conical screw mounted on a vertical shaft and positioned below said perforated blades, means for removing clarified liquid from an upper portion of said cylindrico-conical tank, said perforated blades being inclined so as to push said flakes of sludge towards said conical screw, and drive means for rotating said blades and said perforated conical screw.
Claim 9
Independent Claim
200 words
A device for compacting fluid sludge comprising a cylindrico-conical tank, means defining a flocculation chamber in said cylindrico-conical tank, said flocculation chamber having an outlet in said cylindrico-conical tank, inlet means for transferring fluid sludge to be treated into said flocculation chamber, deflector means positioned at the outlet of said flocculation chamber for producing a concentrated sludge, stirring means for stirring the concentrated sludge so that the flakes of sludge in said concentrated sludge increase in volume and density, the stirring means being disposed in the cylindrical part of said tank below said flocculation chamber and comprising a plurality of inclined perforated blades mounted on a vertical shaft, compacting means located in the conical portion of said tank for compacting sludge and for discharging compacted sludge from an opening in the lower part of said cylindrico-conical tank, said compacting means comprising at least one perforated conical screw mounted on a vertical shaft and positioned below said perforated blades, means for removing clarified liquid from an upper portion of said cylindrico-conical tank, said perforated blades being inclined so as to push said flakes of sludge towards said conical screw, and drive means for rotating said blades and said perforated conical screw.
Claim 10
Dependent Claim
37 words
Device according to claim 7, further including level detector means mounted on said tank for controlling said drive means in accordance with the level of sludge in said tank to regulate the rotation of said conical screw.
Claim 11
Dependent Claim
24 words
Device according to claim 8, characterized in that said level detector means controls the rotation speed of both said blades and said conical screw.
Claim 12
Dependent Claim
31 words
Device according to claim 8, further including means responsive to said level detector means for controlling the cross section of the outlet orifice, thereby controlling the discharge of the compacted sludges.
Claim 13
Dependent Claim
32 words
Device according to claim 8, characterized in that said outlet orifice for discharging the compacted sludges is connected to a volumetric extraction pump whose discharge is controlled by said level detector means.
Claim 14
Dependent Claim
43 words
Device according to claim 8, characterized in that an adjustable horizontal plate adjustable for height is arranged below and at a slight distance from the outlet orifice for the compacted sludge and means is provided for adjusting the height of said horizontal plate.
Claim 15
Dependent Claim
42 words
Device according to claim 7, further comprising a first control device for controlling the rotation of said blades and a second control device for controlling the rotation of the conical screw, said first and second control devices being distinct from each other.
Claim 16
Dependent Claim
24 words
Device according to claim 7, characterized in that the rotating blades are arranged in several superimposed rows, each row comprising at least two blades.
Claim 17
Dependent Claim
28 words
Device according to claim 7, further comprising an inlet duct for the sludge to be treated, said inlet duct being provided with a second inlet for flocculation agents.
Claim 18
Dependent Claim
20 words
The device of claim 7, wherein said screw and said perforated blades are mounted for rotation about a common axis.
Claim 19
Dependent Claim
20 words
The device of claim 7, further comprising means for controlling the flow of compacted sludge passing out of said outlet.
Claim 20
Dependent Claim
22 words
The device of claim 17, wherein said means for controlling is responsive to the level of compacted sludge in said cylindrical-conical tank.
Claim 21
Dependent Claim
22 words
The device of claim 18, wherein the rotation of said screw and said stirring means is controlled by said means for controlling.
Claim 22
Dependent Claim
12 words
The device of claim 7, wherein said perforated Blades are horizontally disposed.
Claim 23
Dependent Claim
221 words
Device for compacting fluid sludge containing fine substances comprising a tank, an inlet duct for conveying the sludges to be treated, several tubes each leading into said tank at spaced points and being connected to said inlet duct, a deflector positioned at about half the height of the tank at the outlet of each tube, a plurality of groups of perforated blades mounted for rotation about a respective vertical axis and being disposed in said tank below each deflector, a plurality of conical perforated screws each mounted for rotation about a vertical axis below a respective group of rotating blades in a respective one of a plurality of conical recesses at the base of said tank, each conical recess comprising at its lower end an outlet orifice for discharging the compacted sludge, the top end of said tank comprising spillway means for the removal of the fluid contained in the sludge, and drive means for rotating said blades and said conical screws, said perforated blades being inclined so that each group of perforated blades pushes flakes of sludge towards the respective conical screw. 22. Device according to claim 21, further including level detector means mounted on said tank for controlling said drive means in accordance with the level of sludge in said tank to regulate the rotation of said conical screws.
Claim 24
Dependent Claim
24 words
Device according to claim 22, characterized in that said level detector means controls the rotation speed of both said blades and said conical screws.
Claim 25
Dependent Claim
33 words
Device according to claim 22, further including means responsive to said level detector means for controlling the cross section of at least one outlet orifice, thereby controlling the discharge of the compacted sludge.
Claim 26
Dependent Claim
34 words
Device according to claim 22, characterized in that at least one outlet orifice for discharging the compacted sludge is connected to a volumetric extraction pump whose discharge is controlled by said level detector means.
Claim 27
Dependent Claim
45 words
Device according to claim 22, characterized in that an adjustable horizontal plate adjustable for height is arranged below and at a slight distance from at least one outlet orifice for the compacted sludge and means is provided for adjusting the height of said horizontal plate.
Claim 28
Dependent Claim
25 words
Device according to claim 21, characterized in that each group of blades and the respective conical screw are mounted for rotation on a common shaft.
Claim 29
Dependent Claim
57 words
Device according to claim 21, characterized in that said drive means includes a first control device for controlling the rotation of the blades and a second control device for the rotation of the blades and a second control device for the rotation of the conical screws, said first and second control devices being distinct from each other.
Claim 30
Dependent Claim
27 words
Device according to claim 21, characterized in that the rotating blades of each group are arranged in several superimposed rows, each row comprising at least two blades.
Claim 31
Dependent Claim
26 words
Device according to claim 21, characterized in that said inlet duct for the sludge to be treated is provided with a second inlet for flocculation agents.
Claim 32
Dependent Claim
12 words
The device of claim 21, wherein said perforated blades are horizontally disposed.
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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) | 1978-12-01 | 1979-06-02 | 1979-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-01 | 1983-06-02 | 1983-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-01 | 1987-06-02 | 1987-12-02 | $7700.00 | Window Closed / Lapsed |