GB2113564A - Apparatus for the removal of solids from a liquid - Google Patents

Apparatus for the removal of solids from a liquid Download PDF

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Publication number
GB2113564A
GB2113564A GB08301172A GB8301172A GB2113564A GB 2113564 A GB2113564 A GB 2113564A GB 08301172 A GB08301172 A GB 08301172A GB 8301172 A GB8301172 A GB 8301172A GB 2113564 A GB2113564 A GB 2113564A
Authority
GB
United Kingdom
Prior art keywords
liquid
solids
settling tank
chute
chute portion
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.)
Withdrawn
Application number
GB08301172A
Other versions
GB8301172D0 (en
Inventor
Arthur Kenneth Bullock
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to GB08301172A priority Critical patent/GB2113564A/en
Publication of GB8301172D0 publication Critical patent/GB8301172D0/en
Publication of GB2113564A publication Critical patent/GB2113564A/en
Withdrawn legal-status Critical Current

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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
    • B01D35/22—Directing the mixture to be filtered on to the filters in a manner to clean the filters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/0012—Settling tanks making use of filters, e.g. by floating layers of particulate material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/02—Settling tanks with single outlets for the separated liquid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/26—Separation of sediment aided by centrifugal force or centripetal force
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/26—Separation of sediment aided by centrifugal force or centripetal force
    • B01D21/267—Separation of sediment aided by centrifugal force or centripetal force by using a cyclone
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2221/00—Applications of separation devices
    • B01D2221/14—Separation devices for workshops, car or semiconductor industry, e.g. for separating chips and other machining residues

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Removal Of Floating Material (AREA)

Abstract

Apparatus for removing gelatinous solids from stripping solution comprises a settling tank 1 into which the solution is fed from inlet 8 down a chute consisting of two oppositely inclined filter portions 10 and 11, with an imperforate plate 12 receiving liquid which flows through the upper portion 10. The solids coalesce as they slide down the filter portions, and the coalesced solids and filtered liquid then enter the settling tank at Y and X. The tank is divided by an upright baffle 5 extending to its floor 2 but stopping short of end wall 6. The chute is located on one side of the baffle, and liquid must flow round the end of the baffle to reach an overflow leading to a liquid outlet (16). The solids slide down inclined floor to solids discharge valve 3. An upstream cyclone separator 9 may be provided. <IMAGE>

Description

SPECIFICATION Apparatus for the removal of solids from a liquid The invention relates to apparatus for the removal of solids from a liquid and is particularly concerned with the removal of solids from the effluent of an industrial process.
One such process is concerned with the separation of suspended photo-polymerised solids fromm a solution resulting from the stripping of film resist layers which may be used during the manufacture of printed circuit boards. Stripping solutions quickly become loaded with gelatinous material and form an effluent which must not be discharged into a town drainage system and so has to be collected and stored for subsequent disposal.
According to the invention, the apparatus comprises a settling tank into which a liquid containing solids is discharge at a level above the normal level of liquid within the settling tank; a chute down which the liquid is introduced into the settling tank, the chute being constructed in at least two downwardly-extending chute portions positioned one above the otherwith the lower end of an upper chute portion substantially vertically above the upper end of an adjacent lower chute portion and the upper end of said upper chute portion substantially vertically above the lower end of said chute portion, each said chute portion having a filter in its base through which part the liquid flowing down each chute portion will pass, thereby leaving the solids to flow with the remaining liquid flowing down the chute portion, and an imperrforate downwardly-inclined deflector plate positioned between each adjacent upper and lower chute portion, whereby liquid which has passed through the filter of said upper chute portion will be deflected directly into the settling tank instead of it impinging on said lower chute portion.
In this way at least a pair of said chute portions have a combined effective filter length in the direction of liquid flow down the chute portions equal to the sum of the individual filter lengths of the chute portions within the length in a horizontal plane of the projection thereon of only one of said chute portions, thereby providing a larger filtration area, and consequently a longer time of flow down the whole chute, over a comparatively small horizontal area of the settling tank, and thereby to enable the settling tank to have a comparatively small area in a horizontal plane. With this apparatus, some liquid will be separated from the solids and the latter will be carried down the chute portions with the remaining flow of liquid down the chute portions.As the solids are carried down the chute portions, they will tend to coalesce into lumps which will fall from the lower end of the lower, or lowest, chute portion into the settling tank.
The settling tank may have a sloping bottom leading to an outlet from which the settled solids can be removed.
At least one of the chute portions may be pivotally mounted at one end thereof for swinging about a horizontal axis, whereby the angle of inclination of the chute portion can be altered, thereby to alterthe velocity of flow down the chute portion and the time during which liquid can pass through the filter.
The settling tank may have therein an upright partition extending from the bottom of the settling tank to a height above that of the maximum permitted liquid level to separate the interior of the settling tank into a first region beneath the chute portions and a second region in which liquid and separated solids will collect, the second region having therein an outlet for liquid at an upper level through which liquid will flow after flowing over a weir in said second region, the upright partition being spaced from an end wall of the settling tank, or provided with apertures therein, thereby to enable liquid and separated solids to pass from said first region into said second region and liquid in said second region of the settling tank to flow over the weir therein to said liquid outlet.The second region of the settling tank may also have a baffle therein extending between levels both below and above the level of overflow of the weir and spaced in the upstream direction therefrom, thereby to prevent a scum floating on the surface of the liquid in said second region of the settling tank from flowing with the liquid over the weir.
By providing the upright partition, the horizontal distance between the outlet from the lower, or lowest, chute portion and the liquid outlet downstream of the weir in the direction of flow within the settling tank can be substantially reduced, thereby reducing the corresponding horizontal dimension of the settling tank. The provision of the upright partition thereby enables the flow-path, as viewed in plan, of liquid from a position immediately beneath the discharge end of the lower, or lowest, chute portion to the weir to be reversed around the partition or through apertures therein to a U-shape.
More than one such partition can be provided to reverse the flow more than once in its path, as viewed in plan, beneath the discharge from the lower or lowest chute portion and the weir.
Apparatus for separating solids from a liquid in accordance with this invention is now described with reference to the accompanying drawings, in which: Figure 1 is a section on the line I-I in Figure 2; Figure 2 is a section on the line Il-Il in Figure 1; Figure 3 is a plan view in the direction of arrow Ill in Figure 1; Figure 4 is a section on the line IV-IV in Figure 2, and Figure 5 is a plan view of either of the chute portions 10, 11 shown in Figure 1.
Referring to the drawings, the apparatus comprises a settling tank 1 having a sloping bottom wall 2 having at its lowest point an outlet pipe containing a valve 3. The outlet valve 3 is openable to remove the solids which have collected at 4 as a sludge. The settling tank 1 contains an upright partition 5 which extends through the whole depth of the tank but is spaced from one end wall 6 thereof, thereby to permit the sludge 4 and liquid above it to communicate between regions of the interior of the tank on each side of the partition 5 and for the levels of the liquid and the sludge to be the same in each of said regions of the tank.
Above the top of the tank at one side of the partition 5 there is a liquid inlet 8, indicated in Figures 1 and 2. This may be an outlet from a cyclone or other separator 9 and may introduce liquid containing solids in suspension and from which the solids are to be allowed to settle in the tank 1.
The liquid is allowed to flow from the inlet 8 to a first inclined chute portion 10. This has a base formed of or containing a filter mesh. Below the upper chute portion 10, there is a second inclined chute portion 11 also having a base formed of or containing a filter mesh. The construction of the base of each chute portion 10, 11 is described hereinafter with reference to Figure 5. The inclination of the lower chute portion 11 is opposite to that of the upper chute portion 10. The upper end of the lower chute portion 11 is positioned beneath the lower end of the upper chute portion 10 and the lower end of the lower chute portion 11 is positioned beneath the upper end of the upper chute portion 10.
The liquid containing solids flows down the upper chute portion 10 and is discharged therefrom onto the upper end of the lower chute portion 11.
Thus the liquid containing solids flows down the upper chute portion 10 and then down the lower chute portion 11 with the exception of liquid which, during this motion, will have passed through the filter mesh of the two chute portions 10, 11. Between the two chute portions 10 and 11, there is an inclined imperforate deflector plate 12 having a downwardly-directed extension 13 which deflects liquid which has passed through the filter mesh of the upper chute portion 10 into the tank 1 in the direction of arrow X and prevents its from impinging on the lower chute portion 11. Thus the only liquid which will reach the lower chute portion is that which flows from the lower end of the upper chute portion 10.
Referring to Figure 5, it will be seen that each of the chute portions 10, 11 comprises a base 20 containing large apertures 21 covered by a mesh sheet or gauze 22.
During the flow of liquid down the upper chute portion 10 some of the liquid will pass through the filter mesh thereof and be deflected into the tank 1 in the direction of arrow X by the deflector plate 12.
Thus all the solids of larger particle size than the mesh of the upper chute portion 10 will flow down the upper chute portion 10 onto the lower chute portion 11 with liquid which has not passed through the filteeer mesh of the upper chute portion 10. More liquid will then pass through the filter mesh of the lower chute portion 11, thereby leaving all the solids of larger particle size than the mesh of the lower chute portion 11 to flow down the chute portion 11.
The solids separate by the two filter meshes will tend to coalesce and will form lumps which will fall from the lower chute portion 11 in the direction of arrow Y into the tank 1 and thus will be sufficiently dense to reach the bottom of the tank. The quantity of solids separated in this way depends upon the length of the chute portions 10, 11 and their angles of inclination.
By providing the two oppositely-inclined chute portions 10, 11 one beneath the other, the effective length of the whole chute is equal to that of an equivalent length in a single continuous chute but the space occupied and thus the projected length on a horizontal plane is only approximatefy half that of a single continuous chute. Thus the breadth of the tank 1 and the effective length of the chute can both be made much smaller than if a single continuous chute were to be used. Although only two superimposed chute portions 10, 11 are shown, three or more superimposed chute portions with imperforate deflector plates 12 between each pair of adjacent chute portions may be provided. Also the rate of flow of liquid and solids down the chute portions is slower with two or more such portions than with a single continuous chute.
The liquid and the separate sludge flow around the partition Sin the direction of arrows 14 shown in Figure 3 to the other side of the partition 5. There a weir 15 extends between the partition 5 and the adjacent side wall of the tank 1 and so clean liquid, but not sludge, overflows the weir 15 and passes through an outlet pipe 16 positioned below the overflow level 18 of the weir 15. The effect of the partition 5 is to produce a flow-path around the partition 5, as shown by the arrows 14, of U-shape, thereby substantially to halve the space occupied by the flow-path between a point beneath the lower end of the lower chute portion 11 and the weir 15 in a horizontal plane, while keeping the effective length of the flow-path unaltered. This therefore enables the settling tank 1 to be compact in width, as viewed in Figure 1.A larger effective flow-path and conversely a narrow tank can be produced by providing more than one internal partition 5 and by arranging for the flow-path, as viewed in plan, between the lower end of the lower chute portion 11 and the weir 15 to be of undulatory shape.
Another feature of the apparatus, which may be optional, is to provide parallel with the weir 15, an upright baffle 17, between the weir 15 and the end wall 6 of the tank 1.The baffle 17 has its upper edge above the level of the top of the weir 15 and its lower edge beneath the top of the weir 15 and thus the baffle 17 will act to hold back any scum floating on the surface of the liquid and so prevent it from overflowing the weir 15 and reaching the outlet pipe 16. During operation, clean liquid will continuously be replenished between the baffle 17 and the weir 15 and so this clean liquid will overflow the weir.
The scum can be removed from behind the baffle 17 or when the valve 3 is opened it will fall with residual liquid and solids and can therefore be removed through the valve 3.
Two tanks 1 and the associated apparatus in each tank can be used alternately to treat a liquid so that while one tank 1 is being emptied of solids and residual liquid and scum through the valve 3, the other can be used normally to discharge clean liquid, e.g. water, through the outlet 16.
A pump (not shown) would be provided to pump the liquid to be filtered to the separator 9 in which initial separation of a clean liquid fraction from a liquid and solids fraction is effeected, the liquid and solids fraction being discharged from the separator 9 to the inlet pipe 8.
Although the chute portions 10, 11 are shown at fixed inclinations, one or both of them may be mounted for swinging about a horizontal axis, whereby the angle of inclination thereof can be altered, thereby to alter the velocity of flow down the respective chute portion and the time during which liquid can pass through the filter thereof.

Claims (8)

1. Apparatus comprising a settling tank into which a liquid containing solids is discharged at a level above the normal level of liquid within the settling tank; a chute down which the liquid is introduced into the settling tank, the chute being constructed in at least two downwardly-extending chute portions positioned one above the other with the lower end of an upper chute portion substantially vertically above the upper end of a adjacent lower chute portion and the upper end of said upper chute portion substantially vertically above the lower end of said lower chute portion, each said chute portion having a filter in its base through which part of the liquid flowing down each chute portion will pass, thereby leaving the solids to flow with the remaining liquid flowing down the chute portion, and an imperforate downwardly-inclined deflector plate positioned between each adjacent upper and lower chute portion, whereby liquid which has passed through the filter of said upper chute portion will be deflected directly into the settling tank instead of it impinging on said chute portion.
2. Apparatus as claimed in Claim 1 in which the settling tank has a sloping bottom surface leading to an outlet from which the settled solids are removable.
3. Apparatus as claimed in Claim 1 or 2 in which at least one of the chute portions is pivotally mounted at one end thereof for swinging about a horizontal axis, whereby the angle of inclination of the chute portion can be altered, thereby to alter the velocity of flow down the chute portion and the time during which liquid can pass through the filter therein.
4. Apparatus as claimed in any preceding claim in which the settling tank contains an upright partition extending from the bottom of the settling tank to a height above that of the maximum permitted liquid level to separate the interior of the settling tank into a first region beneath the chute portions and a second region in which liquid and separated solids will collect, the second region having therein a weir over which liquid will flow; an outlet at a level below the weir through which liquid will flow after flowing over the weir, the upright partition being spaced from an end wall of the settling tank, or provided with apertures therein, thereby to enable liquid and separated solids to pass from said first region into said second region and liquid in said second region of the settling tank to flow over the weir therein to said liquid outlet.
5. Apparatus as claimed in Claim 4 in which said second region of the settling tank also has a baffle therein extending between levels both below and above the level of overflow of the weir and spaced in the upstream direction therefrom, thereby to prevent a scum floating on the surface of the liquid in said second region of the settling tank from flowing with the liquid over the weir.
6. Apparatus as claimed in any preceding claim in combination with an upstream separator of the kind having an inlet to which an effluent containing solids is introduced; a first outlet for a clean liquid fraction and a second outlet for a denser liquid with solids fraction, the second outlet being connected to an inlet from which, in use, said denser liquid with solids fraction is discharged onto said upper chute portion.
7. The combination as claimed in Claim 6 in which the separator is of the vortex or cyclone type.
8. Apparatus for separating solids from a liquid containing solids constructed and arranged substantially as described herein and shown in the accompanying drawings.
GB08301172A 1982-01-29 1983-01-17 Apparatus for the removal of solids from a liquid Withdrawn GB2113564A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08301172A GB2113564A (en) 1982-01-29 1983-01-17 Apparatus for the removal of solids from a liquid

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8202591 1982-01-29
GB08301172A GB2113564A (en) 1982-01-29 1983-01-17 Apparatus for the removal of solids from a liquid

Publications (2)

Publication Number Publication Date
GB8301172D0 GB8301172D0 (en) 1983-02-16
GB2113564A true GB2113564A (en) 1983-08-10

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Family Applications (1)

Application Number Title Priority Date Filing Date
GB08301172A Withdrawn GB2113564A (en) 1982-01-29 1983-01-17 Apparatus for the removal of solids from a liquid

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2529614A (en) * 2014-07-03 2016-03-02 Bateman Advanced Technologies Ltd Reverse flow settler apparatus

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2529614A (en) * 2014-07-03 2016-03-02 Bateman Advanced Technologies Ltd Reverse flow settler apparatus
US20170157535A1 (en) * 2014-07-03 2017-06-08 Tenova Advanced Technologies Ltd. Reverse flow settler apparatus
GB2529614B (en) * 2014-07-03 2017-11-29 Tenova Advanced Tech Ltd Reverse flow settler apparatus
US10040000B2 (en) * 2014-07-03 2018-08-07 Tenova Advanced Technologies Ltd. Reverse flow settler apparatus

Also Published As

Publication number Publication date
GB8301172D0 (en) 1983-02-16

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)