CA1143295A - Means for separation of suspended solid particles from a liquid flow - Google Patents
Means for separation of suspended solid particles from a liquid flowInfo
- Publication number
- CA1143295A CA1143295A CA000344030A CA344030A CA1143295A CA 1143295 A CA1143295 A CA 1143295A CA 000344030 A CA000344030 A CA 000344030A CA 344030 A CA344030 A CA 344030A CA 1143295 A CA1143295 A CA 1143295A
- Authority
- CA
- Canada
- Prior art keywords
- cassette
- basin
- flow
- clear liquid
- cassettes
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000007788 liquid Substances 0.000 title claims abstract description 42
- 239000002245 particle Substances 0.000 title claims abstract description 10
- 239000007787 solid Substances 0.000 title claims abstract description 9
- 238000000926 separation method Methods 0.000 title claims description 4
- 239000000725 suspension Substances 0.000 claims abstract description 17
- 239000013049 sediment Substances 0.000 claims abstract description 6
- 241000446313 Lamella Species 0.000 claims description 13
- 239000004744 fabric Substances 0.000 abstract description 21
- 239000010802 sludge Substances 0.000 description 5
- 238000010276 construction Methods 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 239000008394 flocculating agent Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
- B01D35/20—Vibrating the filters
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D33/00—Filters with filtering elements which move during the filtering operation
- B01D33/04—Filters with filtering elements which move during the filtering operation with filtering bands or the like supported on cylinders which are impervious for filtering
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D33/00—Filters with filtering elements which move during the filtering operation
- B01D33/44—Regenerating the filter material in the filter
- B01D33/46—Regenerating the filter material in the filter by scrapers, brushes nozzles or the like acting on the cake-side of the filtering element
- B01D33/466—Regenerating the filter material in the filter by scrapers, brushes nozzles or the like acting on the cake-side of the filtering element scrapers
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Filtration Of Liquid (AREA)
- Auxiliary Devices For Machine Tools (AREA)
- Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Apparatus Associated With Microorganisms And Enzymes (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
Apparatus for separating suspended solid particles from a liquid flow, comprising an open basin with at least one sloping cassette, members for feeding in the suspension and for removal of the clear liquid from the basin so that the upper end of the cassette lies above the surface of the suspension, said cassette comprising at least one suction box opening towards its upper surface, a screen fabric moving over it, members for displacing said screen fabric over the suction box, a member at the upper end of the cassette for the removal of sediment that has formed on the screen fabric, and a flow-through container above the cassette with a fixed perforated or slotted bottom substantially parallelling the cassette for the receiving of clear liquid from a flow passage between the bottom and the cassette.
Apparatus for separating suspended solid particles from a liquid flow, comprising an open basin with at least one sloping cassette, members for feeding in the suspension and for removal of the clear liquid from the basin so that the upper end of the cassette lies above the surface of the suspension, said cassette comprising at least one suction box opening towards its upper surface, a screen fabric moving over it, members for displacing said screen fabric over the suction box, a member at the upper end of the cassette for the removal of sediment that has formed on the screen fabric, and a flow-through container above the cassette with a fixed perforated or slotted bottom substantially parallelling the cassette for the receiving of clear liquid from a flow passage between the bottom and the cassette.
Description
3;Z~35 The present invention concerns a means for separating suspended solid particles from a liquid flow, in particular a means comprising an open basin with at least one sloping cassette, with members for introducing the suspension and for withdrawal of clear liquid from the basin, 50 that the upper end of the cassette lies above the surface in the basin, said cassette comprising at least one suction box which is open ` towards the upper surface of the cassette, a screen fabric dis-placing itself over this top surface, members for displacing the screen fabric over the suction box, and a member at the upper end of the cassette for removal of sediment that has formed on the screen fabric.
Through the Finnish Patent ~o. 53664 (Canadian patent application 262,705, U. S. Patent 1,096,062), a means is known : in the art for separating suspended particles from a liquid flow. In this means, a plurality of sloping cassettes have - been disposed one after the other in a basin, at least partly over each other, so that in combination with the side walls of the basin they constitute a plurality of flow passages for the suspension. The cassettes extend from a point above the bottom ; of the basin to a point above the surface of the suspension and they comprise a frame of which the upper and lower surface consist of more than two-thirds of a screen fabric and of mem-bers serving to displace said screen fabric upwardly along the upper and downwardly along the lower surface of the cassette to pass over at least two suction boxes having separate draining exits, said suction boxes opening towards the upper and lower ; surface of the cassette to the purpose of withdrawing liquid from the suspension through the screen fabric. The cassettes are in addition provided with a means for taking off the sedi-ment of solid particles from the screen fabric above the surface of the suspension.
.~, ' ' :
. -- 2 --In this means the flow rate of the liquid is controlled in the flow passages to have such height that the flow is turbu-lent but at the same time low enough to cause sedimentation of the matter suspended in the liquid to form a clear layer having a substantially reduced content of suspended matter in the upper part of the liquid flow, more than half of the liquid introduced in the flow passage being filtered off through the upper sieve surface of the flow passage, while less than half of the liquid introduced in the flow passage is drawn through the sediment that is formed on the lower sieve surface in the flow passage.
It has now been found, altogether unexpectedly, that the said means of prior art can be substantially simplified without thereby reducing its capacity. This implies that the same separation capacity is achievable with a considerably more simple, and therefore less expensive, means than heretofore.
A construction in accordance with the present invention includes an apparatus for separating suspended solid particles from a liquid flow which comprises an open basin and means for : feeding the suspension into the basin and for withdrawal of clear liquid from the basin. At least one sloping cassette is provided in the basin having an upper end above the surface of the suspension in the basin. The cassette further comprises at least one suction box opening towards its upper surface. A
screen is also provided along with means for moving the screen over the suction box, as well as means at the upper end of the cassette for the removal of sediment formed on the screen. A
flow-through container is attached to the basin above the cassette and has a fixed bottom substantially parallel with the cassette with apertures or slots for receiving of clear liquid from between the bottom and the cassette.
A considerable simplification of the means according to the Finnish Patent No. 53664 is thus obtainable according to the present invention by substituting the topmost cassette with a flow-through container comprising a perforated or slotted 11~3'~35 fixed bottom, substantially paralleling the rest of the cassettes and serving to receive clear liquid from a flow passage between said perforated or slotted bottom and the cassette lying thereinunder. It should be noted that a means of this kind is equally efficient as the said means of prior art, while it commands a considerably lower price.
A considerable simplification of the means according to the Finnish Patent No. 53664 is thus gainable in that one substitutes for the topmost cassette, a flow-through container comprising a perforated fixed bottom, substantially paralleling the rest of the cassettes and serving to receive clear liquid from the flow passage between said perforated bottom and the cassette lying thereinunder. It could be noted that a means of this kind is equally efficient as the said means of prior art, , while it commands a considerably lower price.
In a specially preferred embodiment of the present invention, a plurality of cassettes have been disposed radially ; in a conical, upwardly widening basin around a centrally dis-posed and downwardly open infeed space, which is encircled by an annular collecting passage of which the bottom is perforated in those parts which face the cassettes communicating with the flow-through containers and comprising a draining exit for clear liquid.
Similarly as in the means according to the Finnish Patent No. 53664, it is also in the present means possible to dispose a plurality of ribbon cassettes partly overlapping each other, and in which connection the cassettes may present flow-through containers which are open towards their lower surface and with a perforated or slotted bottom for the draining of clear liquid from the flow passages between cassettes.
In an alternative embodiment of the present invention, the flow-through container is constituted by a lamella sedimenta-tor known per se furnished with obliquely placed lamellae for further separation of sludge from the clear solution and for returning the sludge into the flow passage between the cassette 3'Z~5 - 3a -and the bottom of the lamella sedimentator before the clear solu-tion i9 removed from the upper part of the lamella sedimentator.
Lamella sedimentators of this kind are well known for an artisan -and have been described among others in the Finnish Patent 52279, and the U.K. Patent 1,463,380.
The flow passages between the flow-through container and the cassette thereinunder are preferably closed in lateral - direction by side walls.
The present invention shall be more closely described with reference to the attached drawings, wherein:
Fig. 1 illustrates, in cross-section, the elevational view of a means of the invention;
Fig. 2 illustrates, sectioned, the elevational view of an alternative, preferred embodiment of the invention;
Fig. 3 shows the same means as Fig. 2 viewed from above;
Fig. 4 shows the section along line A-A in Fig. 3, and Fig. 5 illustrates, in cross-section, the elevational view of an alternative embodiment of the invention.
In Fig. 1, the reference numeral 2 indicates a basin, into which that suspension from which solid suspended particles are to be separated is conducted through a volume 7 open at the top and which constitutes a reception volume for the inflow to the basin 2. Requisite flocculating agents are added into the volume 7 before the suspension runs over the rim of the volume 7 into the basin 2 at a point which may be provided with flow-guiding baffles 15 and with a mixer 8.
The bottom of the basin 2 is sloping, and at a height over its bottom there is a cassette 1 arranged to parallel it and so disposed that one end of the cassette resides under the liquid surface, while the opposite end lies above ~h 'Z9S
the free liquid surface in the basin 2. The suspension meant to be purified flows slowly through the basin 2. Above the cassette 1, there is a flow-through container 4 provided with an apertured bottom 3. In the embodiment illustrated, with only one cassette in the basin 2, the flow-through container 4 ~ extends over the whole breadth of the basin 2. The flow-through container 4 has been so shaped that the same passage geometry is obtained as between two superimposed cassettes 1.
The cassette 1 is of the same type as has been dis-closed in the Finnish Patent No. 53664, with the exception that no suction box opens towards the lower surface of the cassette if only one cassette is used. In contrast, the cassette displays a frame carrying two rolls 11, disposed each at its own end of the cassette. The roll 11 located at that end of the cassette which rises over the liquid surface in the basin 2 is rotated by a drive machinery, which may be an electric motor. The roll 11 lying under the liquid in the basin 2 is a driveless return ; roll. Over these rolls 11 runs an endless screen fabric 13, made, for instance, in resemblance of a plastic or metal wire.
This screen fabric 13 is carried around by the rolls 11 so that the upper part moves obliquely upward alohg the upper surface of the cassette 1, and the lower part moves obliquely downward along the lower surface of the cassette 1 when the latter is in position in the basin 2. The screen fabric 13 has a breadth such that it extends across the entire cassette 1.
In the frame of the cassette, under the screen fabric 13, at least one suction box 9 has been built in. Liquid may flow to the suction box 9 by a plurality of apertures through the screen fabric 13 from the flow passage between the perforated bottom 3 of the flow-through container 4 and the cassette.
Another suction box 10 may be provided at the other end on the cassette 1, which is above the suspension surface. In case several cassettes have been provided in the basin, partly overlapping, the cassettes also present a suction box which opens towards the lower surface of the cassette, which in this case " 11~3;~35 .
also is apertured, so that liquid is enabled to flow through the screen fabric and through the apertures covered by the screen fabric, from the flow passage located under the cassette in question. The cassettes may alternatively present a flow-through passage with perforated bottom and opening towards the lower surface of the cassette, which in such case is not covered by the screen fabric, so that clear liquid is allowed to run by itself from the flow passage between the cassettes and the side walls.
That part of the cassette 1 which is located above the free liquid surface has been provided with a means serving to remove sludge from the screen fabric, such as a doctor blade 12, for instance~
The through-flow rate and velocity are determined by a manually controlled damper S at the exit end of the flow-through container 4. The liquid level in the basin is monitored by a level indicator 6, which controls the output of the infeed device.
In a multiple row embodiment, i.e., with two or more cassettes side by side and partly overlapping, any one of the cassettes in the top row may be replaced with a removable and reinsertable flow-through container according to the present invention. The outflow from the container is then expediently taken care of by the frame construction supporting the cassettes, the supporting horizontal braces of this construction being shaped to constitute a container.
Figures 2 and 3 illustrate a specially preferred embodiment of the present invention, wherein cassettes 1 and the flow-through containers 4 have been arranged in pairs radially in the basin 2 around a common infeed member 18. Here too, the cassettes 1 and flow-through containers 4 constitute obliquely upwardly directed flow passages confined by side walls 17 and through which the suspension meant to be purified will flow.
The major part of the suspended material is removed by the screen fabrics 13, while the clear liquid in the topmost layer 1~3~35 in the liquid flow runs off under its own pressure through the perforated bottoms 3 in the containers 4. The embodiment illustrated is highly compact, and it may be utilized with a good degree of space utilization in spaces and basisn already existing and taken out of use.
The central infeed member 18 is additionally encircled by an annular collecting passage 16 communicating with the flow-through containers 4 by damper-controlled apertures in their side wall, for collecting that clear liquid which has run into the flow-through containers 4, as has been shown in Figure 4. The collected clear liquid runs out from the collecting passage through the exit 14.
It is obvious that a plurality of cassettes may be arranged partly overlapping in the basin, in which connection the flow-through passages have been suitably built into the cassettes, so that in the cassettes there is a flow-through passage with perforated bottom and constituting part of the lower surface of the cassette and which is not covered by the wire.
Figure 5 illustrates an alternative embodiment in which the flow-through container is constituted by a lamella sedimenta-tor 20 of common type. This kind of a lamella sedimentator ; consists of obliquely placed lamellae 21. The clear solution flows in between the lamellae 21 from the flow passage between the bottom 3 of the lamella sedimentator 20 and the cassette 1.
In the spaces between the lamellae 21, further sludge is separated from the colution, which sludge goes down to the flow ; passage between the bottom 3 of the lamella sedimentator 20 and the cassette 1 and ends up on the screen fabric 13. The clear solution, again, is removed in a manner known per se at the upper portion of the lamella sedimentator 20 and collected and removed through outlet opening 14. The construction and utilization of lamella sedimentators of this kind belong to the normal skill in the art and have, therefore, not been closer described in this connection.
`
Through the Finnish Patent ~o. 53664 (Canadian patent application 262,705, U. S. Patent 1,096,062), a means is known : in the art for separating suspended particles from a liquid flow. In this means, a plurality of sloping cassettes have - been disposed one after the other in a basin, at least partly over each other, so that in combination with the side walls of the basin they constitute a plurality of flow passages for the suspension. The cassettes extend from a point above the bottom ; of the basin to a point above the surface of the suspension and they comprise a frame of which the upper and lower surface consist of more than two-thirds of a screen fabric and of mem-bers serving to displace said screen fabric upwardly along the upper and downwardly along the lower surface of the cassette to pass over at least two suction boxes having separate draining exits, said suction boxes opening towards the upper and lower ; surface of the cassette to the purpose of withdrawing liquid from the suspension through the screen fabric. The cassettes are in addition provided with a means for taking off the sedi-ment of solid particles from the screen fabric above the surface of the suspension.
.~, ' ' :
. -- 2 --In this means the flow rate of the liquid is controlled in the flow passages to have such height that the flow is turbu-lent but at the same time low enough to cause sedimentation of the matter suspended in the liquid to form a clear layer having a substantially reduced content of suspended matter in the upper part of the liquid flow, more than half of the liquid introduced in the flow passage being filtered off through the upper sieve surface of the flow passage, while less than half of the liquid introduced in the flow passage is drawn through the sediment that is formed on the lower sieve surface in the flow passage.
It has now been found, altogether unexpectedly, that the said means of prior art can be substantially simplified without thereby reducing its capacity. This implies that the same separation capacity is achievable with a considerably more simple, and therefore less expensive, means than heretofore.
A construction in accordance with the present invention includes an apparatus for separating suspended solid particles from a liquid flow which comprises an open basin and means for : feeding the suspension into the basin and for withdrawal of clear liquid from the basin. At least one sloping cassette is provided in the basin having an upper end above the surface of the suspension in the basin. The cassette further comprises at least one suction box opening towards its upper surface. A
screen is also provided along with means for moving the screen over the suction box, as well as means at the upper end of the cassette for the removal of sediment formed on the screen. A
flow-through container is attached to the basin above the cassette and has a fixed bottom substantially parallel with the cassette with apertures or slots for receiving of clear liquid from between the bottom and the cassette.
A considerable simplification of the means according to the Finnish Patent No. 53664 is thus obtainable according to the present invention by substituting the topmost cassette with a flow-through container comprising a perforated or slotted 11~3'~35 fixed bottom, substantially paralleling the rest of the cassettes and serving to receive clear liquid from a flow passage between said perforated or slotted bottom and the cassette lying thereinunder. It should be noted that a means of this kind is equally efficient as the said means of prior art, while it commands a considerably lower price.
A considerable simplification of the means according to the Finnish Patent No. 53664 is thus gainable in that one substitutes for the topmost cassette, a flow-through container comprising a perforated fixed bottom, substantially paralleling the rest of the cassettes and serving to receive clear liquid from the flow passage between said perforated bottom and the cassette lying thereinunder. It could be noted that a means of this kind is equally efficient as the said means of prior art, , while it commands a considerably lower price.
In a specially preferred embodiment of the present invention, a plurality of cassettes have been disposed radially ; in a conical, upwardly widening basin around a centrally dis-posed and downwardly open infeed space, which is encircled by an annular collecting passage of which the bottom is perforated in those parts which face the cassettes communicating with the flow-through containers and comprising a draining exit for clear liquid.
Similarly as in the means according to the Finnish Patent No. 53664, it is also in the present means possible to dispose a plurality of ribbon cassettes partly overlapping each other, and in which connection the cassettes may present flow-through containers which are open towards their lower surface and with a perforated or slotted bottom for the draining of clear liquid from the flow passages between cassettes.
In an alternative embodiment of the present invention, the flow-through container is constituted by a lamella sedimenta-tor known per se furnished with obliquely placed lamellae for further separation of sludge from the clear solution and for returning the sludge into the flow passage between the cassette 3'Z~5 - 3a -and the bottom of the lamella sedimentator before the clear solu-tion i9 removed from the upper part of the lamella sedimentator.
Lamella sedimentators of this kind are well known for an artisan -and have been described among others in the Finnish Patent 52279, and the U.K. Patent 1,463,380.
The flow passages between the flow-through container and the cassette thereinunder are preferably closed in lateral - direction by side walls.
The present invention shall be more closely described with reference to the attached drawings, wherein:
Fig. 1 illustrates, in cross-section, the elevational view of a means of the invention;
Fig. 2 illustrates, sectioned, the elevational view of an alternative, preferred embodiment of the invention;
Fig. 3 shows the same means as Fig. 2 viewed from above;
Fig. 4 shows the section along line A-A in Fig. 3, and Fig. 5 illustrates, in cross-section, the elevational view of an alternative embodiment of the invention.
In Fig. 1, the reference numeral 2 indicates a basin, into which that suspension from which solid suspended particles are to be separated is conducted through a volume 7 open at the top and which constitutes a reception volume for the inflow to the basin 2. Requisite flocculating agents are added into the volume 7 before the suspension runs over the rim of the volume 7 into the basin 2 at a point which may be provided with flow-guiding baffles 15 and with a mixer 8.
The bottom of the basin 2 is sloping, and at a height over its bottom there is a cassette 1 arranged to parallel it and so disposed that one end of the cassette resides under the liquid surface, while the opposite end lies above ~h 'Z9S
the free liquid surface in the basin 2. The suspension meant to be purified flows slowly through the basin 2. Above the cassette 1, there is a flow-through container 4 provided with an apertured bottom 3. In the embodiment illustrated, with only one cassette in the basin 2, the flow-through container 4 ~ extends over the whole breadth of the basin 2. The flow-through container 4 has been so shaped that the same passage geometry is obtained as between two superimposed cassettes 1.
The cassette 1 is of the same type as has been dis-closed in the Finnish Patent No. 53664, with the exception that no suction box opens towards the lower surface of the cassette if only one cassette is used. In contrast, the cassette displays a frame carrying two rolls 11, disposed each at its own end of the cassette. The roll 11 located at that end of the cassette which rises over the liquid surface in the basin 2 is rotated by a drive machinery, which may be an electric motor. The roll 11 lying under the liquid in the basin 2 is a driveless return ; roll. Over these rolls 11 runs an endless screen fabric 13, made, for instance, in resemblance of a plastic or metal wire.
This screen fabric 13 is carried around by the rolls 11 so that the upper part moves obliquely upward alohg the upper surface of the cassette 1, and the lower part moves obliquely downward along the lower surface of the cassette 1 when the latter is in position in the basin 2. The screen fabric 13 has a breadth such that it extends across the entire cassette 1.
In the frame of the cassette, under the screen fabric 13, at least one suction box 9 has been built in. Liquid may flow to the suction box 9 by a plurality of apertures through the screen fabric 13 from the flow passage between the perforated bottom 3 of the flow-through container 4 and the cassette.
Another suction box 10 may be provided at the other end on the cassette 1, which is above the suspension surface. In case several cassettes have been provided in the basin, partly overlapping, the cassettes also present a suction box which opens towards the lower surface of the cassette, which in this case " 11~3;~35 .
also is apertured, so that liquid is enabled to flow through the screen fabric and through the apertures covered by the screen fabric, from the flow passage located under the cassette in question. The cassettes may alternatively present a flow-through passage with perforated bottom and opening towards the lower surface of the cassette, which in such case is not covered by the screen fabric, so that clear liquid is allowed to run by itself from the flow passage between the cassettes and the side walls.
That part of the cassette 1 which is located above the free liquid surface has been provided with a means serving to remove sludge from the screen fabric, such as a doctor blade 12, for instance~
The through-flow rate and velocity are determined by a manually controlled damper S at the exit end of the flow-through container 4. The liquid level in the basin is monitored by a level indicator 6, which controls the output of the infeed device.
In a multiple row embodiment, i.e., with two or more cassettes side by side and partly overlapping, any one of the cassettes in the top row may be replaced with a removable and reinsertable flow-through container according to the present invention. The outflow from the container is then expediently taken care of by the frame construction supporting the cassettes, the supporting horizontal braces of this construction being shaped to constitute a container.
Figures 2 and 3 illustrate a specially preferred embodiment of the present invention, wherein cassettes 1 and the flow-through containers 4 have been arranged in pairs radially in the basin 2 around a common infeed member 18. Here too, the cassettes 1 and flow-through containers 4 constitute obliquely upwardly directed flow passages confined by side walls 17 and through which the suspension meant to be purified will flow.
The major part of the suspended material is removed by the screen fabrics 13, while the clear liquid in the topmost layer 1~3~35 in the liquid flow runs off under its own pressure through the perforated bottoms 3 in the containers 4. The embodiment illustrated is highly compact, and it may be utilized with a good degree of space utilization in spaces and basisn already existing and taken out of use.
The central infeed member 18 is additionally encircled by an annular collecting passage 16 communicating with the flow-through containers 4 by damper-controlled apertures in their side wall, for collecting that clear liquid which has run into the flow-through containers 4, as has been shown in Figure 4. The collected clear liquid runs out from the collecting passage through the exit 14.
It is obvious that a plurality of cassettes may be arranged partly overlapping in the basin, in which connection the flow-through passages have been suitably built into the cassettes, so that in the cassettes there is a flow-through passage with perforated bottom and constituting part of the lower surface of the cassette and which is not covered by the wire.
Figure 5 illustrates an alternative embodiment in which the flow-through container is constituted by a lamella sedimenta-tor 20 of common type. This kind of a lamella sedimentator ; consists of obliquely placed lamellae 21. The clear solution flows in between the lamellae 21 from the flow passage between the bottom 3 of the lamella sedimentator 20 and the cassette 1.
In the spaces between the lamellae 21, further sludge is separated from the colution, which sludge goes down to the flow ; passage between the bottom 3 of the lamella sedimentator 20 and the cassette 1 and ends up on the screen fabric 13. The clear solution, again, is removed in a manner known per se at the upper portion of the lamella sedimentator 20 and collected and removed through outlet opening 14. The construction and utilization of lamella sedimentators of this kind belong to the normal skill in the art and have, therefore, not been closer described in this connection.
`
Claims (4)
1. Apparatus for separating suspended solid particles from a liquid flow, comprising: an open basin; means for feeding the suspension into the basin and for withdrawal of clear liquid from the basin; at least one sloping cassette in the basin and having an upper end above the surface of the suspension in the basin, said cassette further comprising at least one suction box opening towards its upper surface, a screen, means for moving the screen over the suction box, and means at the upper end of the cassette for the removal of sedi-ment formed on the screen; and a flow-through container attached to the basin above the cassette and having a fixed bottom sub-stantially parallel with the cassette with apertures or slots for receiving of clear liquid from between the bottom and the cassette.
2. The apparatus of claim 1, in which a plurality of cassettes have been arranged radially in a conically upwardly widening basin around a central member provided therein and which is encircled by an annular collecting channel communica-ting with the flow-through containers withdrawal of clear liquid and further comprising an outlet for the removal of collected clear liquid.
3. The apparatus of claim 1 or 2, wherein a plurality of cassettes are at least partly overlapping, each cassette having a flow-through container with an apertured or slotted bottom open towards the cassettes' lower surface for removal of clear liquid from between the cassettes.
4. The apparatus of claim 1, wherein the flow-through container is a lamella sedimentator having a plurality of parallel sloped lamellae for further separation of solid particles from the liquid and returning said solid particles to the suspension in the basin prior to withdrawing the clear liquid from the lamella sedimentator and means for removing the clear liquid from the lamella sedimentator.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI790204A FI56319C (en) | 1979-01-22 | 1979-01-22 | ANORDNING FOER SEPARERING AV SUSPENDERADE FASTA PARTIKLAR UR EN VAETSKESTROEM |
| FI790204 | 1979-01-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1143295A true CA1143295A (en) | 1983-03-22 |
Family
ID=8512316
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000344030A Expired CA1143295A (en) | 1979-01-22 | 1980-01-21 | Means for separation of suspended solid particles from a liquid flow |
Country Status (10)
| Country | Link |
|---|---|
| CA (1) | CA1143295A (en) |
| DE (1) | DE3001545A1 (en) |
| DK (1) | DK26280A (en) |
| ES (1) | ES487639A1 (en) |
| FI (1) | FI56319C (en) |
| GB (1) | GB2039769B (en) |
| GR (1) | GR69733B (en) |
| IT (1) | IT1133214B (en) |
| NO (1) | NO150022C (en) |
| SE (1) | SE445177B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104788137A (en) * | 2015-04-17 | 2015-07-22 | 安徽省蚌埠市中远肥业有限公司 | Sedimentation pond for potassium humate fertilizer production |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3625431A (en) * | 1970-01-20 | 1971-12-07 | Ystads Gjuteri Mek Verk | Artificial manure spreader |
| DE3211865C2 (en) * | 1982-03-31 | 1987-03-26 | Gewerkschaft Auguste Victoria, 4370 Marl | Slurry dewatering device |
| GB9919183D0 (en) | 1999-08-13 | 1999-10-20 | Jones & Attowood Limited | Apparatus for use in a sewage treatment plant |
-
1979
- 1979-01-22 FI FI790204A patent/FI56319C/en not_active IP Right Cessation
-
1980
- 1980-01-10 GR GR60997A patent/GR69733B/el unknown
- 1980-01-11 ES ES487639A patent/ES487639A1/en not_active Expired
- 1980-01-17 DE DE19803001545 patent/DE3001545A1/en not_active Withdrawn
- 1980-01-18 NO NO800128A patent/NO150022C/en unknown
- 1980-01-21 IT IT03315/80A patent/IT1133214B/en active
- 1980-01-21 SE SE8000448A patent/SE445177B/en unknown
- 1980-01-21 CA CA000344030A patent/CA1143295A/en not_active Expired
- 1980-01-22 GB GB8002137A patent/GB2039769B/en not_active Expired
- 1980-01-22 DK DK26280A patent/DK26280A/en not_active Application Discontinuation
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104788137A (en) * | 2015-04-17 | 2015-07-22 | 安徽省蚌埠市中远肥业有限公司 | Sedimentation pond for potassium humate fertilizer production |
Also Published As
| Publication number | Publication date |
|---|---|
| GR69733B (en) | 1982-07-09 |
| NO150022C (en) | 1984-08-08 |
| NO150022B (en) | 1984-04-30 |
| SE445177B (en) | 1986-06-09 |
| DE3001545A1 (en) | 1980-07-24 |
| SE8000448L (en) | 1980-07-23 |
| IT8003315A0 (en) | 1980-01-21 |
| NO800128L (en) | 1980-07-23 |
| DK26280A (en) | 1980-07-23 |
| GB2039769B (en) | 1983-02-16 |
| FI56319C (en) | 1980-01-10 |
| IT1133214B (en) | 1986-07-09 |
| GB2039769A (en) | 1980-08-20 |
| FI56319B (en) | 1979-09-28 |
| ES487639A1 (en) | 1980-06-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |