US3705648A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filtration system
Assignee: Zimpro Passavant Inc
•
Filing: 1972-03-30
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Granted: 1972-12-12
•
Expires: 1992-03-30
Abstract
Abstract Method of and apparatus for clarifying a contaminated liquid by pumping unclarified liquid through a primary filter increasing the pressure drop across the filter until such pressure reaches a predetermined level. When the pressure reaches a predetermined level, the filtration operation is interrupted, the filtration system closed, and the filter cake accumulated on the primary filters is removed. The contents of the primary filter chamber are drained to a secondary filter chamber or desludger whereat the liquid bearing the dislodged filter cake suspension from the primary filters and additional filter aid media is re-circulated through a secondary filtration system forming a filter cake on the surface thereof and clarifying the contents of the primary filter chamber drawn thereinto. The liquid in the primary filter chamber, clarified thereby, is pumped through the mixing chamber of a pre-coat feeder whereat various filter cake forming media are added thereto. The clarified liquid bearing the suspended filter aids is pumped through the primary filter chamber for recirculation through the primary filters to form a new filter cake on the surface thereof. When the new filter cake has been formed the filtration system is automatically placed on line to clarify the liquid passing therethrough. While the primary filter is clarifying liquid passing therethrough, the secondary filter of the secondary filtering chamber is cleansed of accumulated filter cake which settles to the bottom of the secondary filter chamber. The expended filter cake or sludge is conveyed downwardly by a central auger in the desludger chamber into a horizontal auger whereat the expended cake or sludge is conveyed to a vertical auger conveyer. The vertical auger is heat jacketed to expose the sludge to heat for solidifying the sludge to a desired consistency and expelling it into a container for disposal.
Inventors
- 👤 Kostas Savas Arvanitakis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:24
CPC Classifications
B; B01; B01D; B01D37/00; B01D37/02; B01D29/00; B01D29/39; B01D29/41; B01D29/50; B01D29/56; B01D29/62; B01D29/64; B01D29/6407; B01D29/6415; B01D29/76; B01D29/80; B01D29/84; B01D29/88; B01D29/94
Claims Analysis
Total Claims: 28
Claim 1
Independent Claim
49 words
The method of claim 1 wherein the step of interrupting the discharge of clarified liquid to the discharge outlet in response to the accumulation of a predetermined level of contaminants on the primary filter is in response to the sensing of a predetermined pressure drop through the primary filter.
Claim 2
Dependent Claim
30 words
The method of claim 1 wherein the step of removing the accumulated contaminants from the primary filter into the unclarified liquid includes brushing the outer surface of said primary filter.
Claim 3
Dependent Claim
36 words
The method of claim 1 further including adding a quantity of filter forming material to the liquid passed from the filtration system to facilitate accumulation of the contaminants and expended filter material by the filter means.
Claim 4
Dependent Claim
59 words
The method of claim 1 wherein the step of adding a quantity of filter forming material to the clarified liquid passed into the chamber and circulating the filter material bearing liquid through the primary filter to renew the filtering elements continues until substantially all of said filter forming material is removed from the clarified liquid to the primary filter.
Claim 5
Dependent Claim
45 words
The method of claim 1 wherein the step of removing and collecting the accumulated contaminants from the secondary filter comprises brushing the outer surface of said secondary filter to remove filter cake formed thereon, and gravitationally separating the filter cake removed from said secondary filter.
Claim 6
Dependent Claim
36 words
The method of claim 1 wherein the step of forming a plug of contaminants during the upward conveying comprises forming a series of contaminant plugs to filter a portion of the suspended solids from the liquid.
Claim 7
Dependent Claim
34 words
The method of claim 1 wherein the step of forming a plug of contaminants during the upward conveying includes preventing liquid below the plug from rising to a level above the plug of contaminants.
Claim 8
Dependent Claim
28 words
The method of claim 1 wherein the step of forming a plug of contaminants during the upward conveying includes squeezing the plug of contaminants to remove liquid therefrom.
Claim 9
Dependent Claim
46 words
The method of claim 7 wherein the step of forming a series of contaminant plugs to filter a portion of the suspended contaminants from the liquid comprises filtering the suspended contaminants through the lowermost plug and squeezing the uppermost plug of contaminants to remove liquid therefrom.
Claim 10
Dependent Claim
26 words
The method of claim 1 wherein the upward conveyance of said contaminants through the auger means is periodically interrupted to facilitate removal of liquid conveyed therewith.
Claim 11
Independent Claim
472 words
A method of fluid pollution control comprising the steps of passing an unclarified fluid having dissolved and suspended contaminants therein through a first filter cake bearing filtration means clarifying the fluid and retaining the contaminants on the filter cake, discharging the clarified fluid to a discharge outlet, interrupting the discharge of clarified fluid and the passing of unclarified fluid in response to the accumulation of a predetermined quantity of contaminants on the filter cake, removing the filter cake and contaminants retained thereon from the first filtration means into suspension in the unclarified liquid. withdrawing the unclarified liquid and expended filter cake from the first filtration means, passing said liquid and filter cake through a second filtration means clarifying the liquid thereby and discharging said liquid, aDding a quantity of filter cake forming material to said discharged liquid, circulating said liquid bearing the filter cake forming material and the unclarified liquid bearing the suspended filter cake through the second filtration means forming a filter cake thereon and clarifying the liquid passing therethrough by removing substantially all of the filter cake forming material and suspended filter cake from the liquid to the second filtration means, interrupting the withdrawal of liquid from the first filtration means upon the clarification thereof, adding a second quantity of filter cake forming material to the clarified liquid, circulating said liquid bearing the second quantity of filter cake forming material through the first filtration means forming a new filter cake thereon and clarifying the liquid by removing substantially all of the filter cake forming material from the liquid to the first filtration means, resuming the passing of unclarified fluid having dissolved and suspended contaminants therein through said first filtration means to be clarified thereby and the discharging of said clarified fluid to a discharge outlet upon the formation of said new filter cake on said first filtration means, removing the filter cake formed on the second filtration means, collecting the removed filter cake and conveying said filter cake from the second filtration means to a vertically disposed auger means which is in direct communication with the second filtration means, the filter cake entering the auger adjacent its bottom, heating the filter cake in the auger means to vaporize at least a portion of the liquid in said filter cake so that the remaining cake can be elevated by the auger means at relatively slow speed of rotation of said auger means, at least a portion of the flight of the auger means being removed at at least one position spaced from the bottom of the auger means, elevating the heated filter cake in said auger means while allowing liquid therein to drain by gravity, forming at least one plug of the filter cake being elevated at said position, and discharging substantially dry cake at the top of said auger mean.
Claim 12
Dependent Claim
41 words
The method of claim 12 wherein the liquid clarified by circulating said unclarified liquid bearing the suspended filter cake through the second filtration means is discharged therefrom into a pre-coat feeder chamber for the addition of the filter cake forming material.
Claim 13
Dependent Claim
419 words
Apparatus for clarifying a liquid having suspended and dissolved contaminants therein comprising means for passing contaminant bearing liquid through a first filtration means, a first filtration means carried within a primary filter chamber including a plurality of hollow mesh filter elements supporting a filter cake material on the surface thereof to remove the suspended and dissolved contaminants from said liquid and discharge the liquid clarified thereby to a discharge outlet, condition responsive means actuable in response to the accumulation of contaminants by said filter cake material to interrupt the passing of contaminant bearing liquid therethrough, means for removing the filter cake and accumulated contaminant from said filter elements into suspension in the contaminant bearing liquid. a vacuum pump for withdrawing the contents of the primary filter chamber into a secondary filter chamber and through a second filtration means, a second filtration means carried within a secondary filter chamber including a plurality of hollow mesh filter elements supporting a filter cake material on the surface thereof to remove the suspended filter cake and contaminants from the liquid passed therethrough and discharge the liquid clarified thereby into a pre-coat chamber, a pre-coat chamber for receiving the clarified liquid discharged from said second filtration means, means for adding a predetermined quantity of filter cake material into said pre-coat chamber to be mixed with the clarified liquid contained therein, means for interrupting the passing of liquid through said second filtration means upon the clarification thereof and circulating the clarified liquid containing the filter cake material through said first filtration means to form a new filter cake on the surface of said filter elements, means actuable upon the interruption of liquid passing through said second filtration means to remove the filter cake from the filter elements, conveyor means to accumulate and remove said filter cake from the secondary filter chamber to a vertically disposed auger means in direct communication with said secondary filter chamber, said conveyor means conveying said filter cake to the auger means adjacent the bottom thereof, heating means in thermal contact with said auger means for vaporizing at least a portion of the liquid in said filter cake so that the auger means is capable of elevating the filter cake at a relatively slow speed of rotation, a portion of the flight of said auger means being removed at at least one position spaced from the bottom thereof for forming a plug of filter cake at said position, means at the top of said auger means for discharging said filter cake.
Claim 14
Dependent Claim
34 words
The apparatus of claim 14 wherein said first and second filtration means each comprise a plurality of coaxial hollow discs having an outer mesh surface forming a septum for support of a filter cake.
Claim 15
Dependent Claim
33 words
The apparatus of claim 14 wherein said condition responsive means includes a pressure sensitive switch actuable in response to the increase in pressure required to pass unclarified fluid through said first filtration means.
Claim 16
Dependent Claim
31 words
The apparatus of claim 14 wherein the means for removing the contaminants accumulated by said first filtration means comprise brush means positioned in contact therewith for mechanically separating the contaminants therefrom.
Claim 17
Dependent Claim
77 words
The apparatus of claim 14 wherein said means for adding a predetermined quantity of filtration means forming material comprises a container for holding a quantity of filtration means forming material, scraper means carried within said container and moveable through the contents contained therein to prevent agglomerating of the filtration means forming material, and an auger rotatably carried within said container to remove a predetermined quantity of the filtration means forming material in response to the rotation thereof.
Claim 18
Dependent Claim
26 words
the apparatus of claim 14 wherein said heated vertical auger has a plurality of auger flight portions removed to form a series of accumulated sludge plugs.
Claim 19
Dependent Claim
38 words
The apparatus of claim 14 wherein said heated portion of said vertical auger extends at least from a point below the bottom outlet of said secondary filter chamber to at least a point above said secondary filter chamber.
Claim 20
Dependent Claim
29 words
The apparatus of claim 14 wherein said heated portion of said vertical auger extends upwardly at least from a point below the bottom outlet of the secondary filter chamber.
Claim 21
Dependent Claim
25 words
The apparatus of claim 14 wherein said heated vertical auger is enclosed by a plurality of selectively actuable heating means to control the temperature thereof.
Claim 22
Dependent Claim
16 words
The apparatus of claim 22 wherein said plurality of selectively actuable heating means comprise steam jackets.
Claim 23
Dependent Claim
18 words
The apparatus of claim 22 further including deflector means carried by said auger to remove the sludge therefrom.
Claim 24
Dependent Claim
48 words
The apparatus of claim 14 wherein said conveyor means conveying said filter cake to the auger means adjacent the bottom thereof includes scraper means carried within said secondary filter chamber and movable through the contents contained therein to prevent filter cake from adhering to the secondary filter chamber.
Claim 25
Dependent Claim
21 words
The apparatus of claim 25 wherein said conveyor means includes a vertically disposed auger means carried within said secondary filter chamber.
Claim 26
Dependent Claim
29 words
The apparatus of claim 26 wherein said conveyor means includes a horizontally disposed auger means in direct communication with said vertically disposed auGer means within said secondary filter chamber.
Claim 27
Dependent Claim
27 words
The apparatus of claim 26 wherein said scraper means is carried by said vertically disposed auger means carried within said secondary filter chamber for rotational movement therewith.
Claim 28
Dependent Claim
26 words
The apparatus of claim 14 wherein the bottom of said secondary filter chamber is conically-shaped to facilitate passage of said filter cake to said conveyor means.
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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) | 1975-12-12 | 1976-06-12 | 1976-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-12 | 1980-06-12 | 1980-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-12 | 1984-06-12 | 1984-12-12 | $7700.00 | Window Closed / Lapsed |