US3796317A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for treating dilute slurries
Assignee: Westinghouse Electric Corp
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Filing: 1972-11-10
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Granted: 1974-03-12
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Expires: 1992-11-10
Abstract
Abstract A system for removing water from dilute slurries of the type discharged from waste water treatment plants, including feeding the dilute slurry into a reservoir and passing concentrically mounted endless screen and porous belts through the reservoir for absorbing water from the slurry. The water is squeezed from the belts and the thus thickened slurry is transported from the reservoir to a position for discharge onto the screen belt which moves in intimate contact with the porous belt. Such intimate contact facilitates further removal of water from the slurry by capillary action as the belts move linearly towards the end of the system. The belts then separate from each other. Water is squeezed from the porous belt and the screen belt with its slurry cake then runs through a pair of rollers for further slurry dewatering and compaction to a desired solids concentration. The thus dewatered slurry cake is then transferred to one of the rollers and subsequently removed from the system for ultimate disposal.
Inventors
- 👤 T Lippert
- 👤 C Beristain
- 👤 M Testa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 03:23
CPC Classifications
B; B01; B01D; B01D33/00; B01D33/04; B01D33/44; B01D33/46; B01D33/465; B01D33/70
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
232 words
Apparatus for dewatering a dilute slurry comprising: a base including spaced rotatable means; a drive means on said base; an endless screen belt mounted for linear movement on said drive means and one of said rotatable means, said belt being preferably made of a non-biodegradable material having pores of sufficient size therein to freely pass water but to hold solids on the belt surface; an endless porous belt supported for linear movement on said spaced rotatable means, said belt having the characteristics of absorbing and holding water; said screen and porous belts being concentrically disposed with respect to each other but maintained in intimate contact throughout a major portion of their length; a reservoir on said base for holding said dilute slurry, said reservoir being positioned to have at least the porous belt move therethrough, said belt being effective to absorb free water in said slurry; dewatering means located at predetermined positions along the porous belt length and beyond the reservoir for removing water from the porous belt as it is moved linearly by said rotatable means; means for moving the slurry from said reservoir onto the screen belt so that as the screen and porous belts move linearly in contact with each other, the porous belt draws water from the slurry and thus leaves a slurry cake on said screen belt; and means for removing said cake from said screen belt.
Claim 2
Dependent Claim
232 words
Apparatus for dewatering a dilute slurry comprising: a base including spaced rotatable means; a drive means on said base; an endless screen belt mounted for linear movement on said drive means and one of said rotatable means, said belt being preferably made of a non-biodegradable material having pores of sufficient size therein to freely pass water but to hold solids on the belt surface; an endless porous belt supported for linear movement on said spaced rotatable means, said belt having the characteristics of absorbing and holding water; said screen and porous belts being concentrically disposed with respect to each other but maintained in intimate contact throughout a major portion of their length; a reservoir on said base for holding said dilute slurry, said reservoir being positioned to have at least the porous belt move therethrough, said belt being effective to absorb free water in said slurry; dewatering means located at predetermined positions along the porous belt length and beyond the reservoir for removing water from the porous belt as it is moved linearly by said rotatable means; means for moving the slurry from said reservoir onto the screen belt so that as the screen and porous belts move linearly in contact with each other, the porous belt draws water from the slurry and thus leaves a slurry cake on said screen belt; and means for removing said cake from said screen belt.
Claim 3
Dependent Claim
56 words
The apparatus according to claim 1, wherein the dilute slurry in the reservoir is maintained at a height sufficient to submerge the porous and screen belts as they pass therethrough; and pump means connected to the outlet of said reservoir for pumping the slightly dewatered slurry therein to a position for discharge onto said screen belt.
Claim 4
Dependent Claim
43 words
The apparatus according to claim 2 including means mounting a container on said base adjacent one of said rotatable means; and conduit means coNnecting the outlet of said pump with the container from which the thickened slurry is deposited on the screen belt.
Claim 5
Dependent Claim
32 words
The apparatus according to claim 3, wherein thickened slurry control means is mounted on said container for controlling the geometry and rate of discharge of the thickened slurry onto said screen belt.
Claim 6
Dependent Claim
48 words
The apparatus according to claim 4 wherein porous belt support means are located along the capillary belt length for maintaining said screen and porous belts in intimate contact with each other to thereby effect the transfer of water from said slurry by capillary action to the porous belt.
Claim 7
Dependent Claim
35 words
The apparatus according to claim 5 including brushes mounted in said reservoir in a position to contact said screen for removing solid particles therefrom as the screen and porous belts move linearly through said reservoir.
Claim 8
Dependent Claim
37 words
The apparatus according to claim 5 wherein porous belt dewatering means are positioned adjacent the discharge end of said reservoir for removing water from said porous belt before said thickened slurry is deposited on the screen belt.
Claim 9
Dependent Claim
84 words
The apparatus according to claim 5 wherein said drive means is located outwardly from said rotatable means to permit separation of the screen and porous belts near said pulley; a compression roller on said base spaced from said drive means a distance sufficient to slightly compress the slurry cake as it passes therethrough; and said compression roller having surface characteristics such that the slurry cake is transferred from said screen belt to the compression roller, and means for removing said cake from said roller.
Claim 10
Dependent Claim
44 words
The apparatus according to claim 8 wherein a second roller is positioned adjacent to and spaced from said drive means a distance sufficient to allow passage of the screen belt therebetween to dewater the screen prior to movement of the belt into said reservoir.
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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) | 1977-03-11 | 1977-09-10 | 1978-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-11 | 1981-09-10 | 1982-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-11 | 1985-09-10 | 1986-03-12 | $7700.00 | Window Closed / Lapsed |