GB2262244A - Filtering apparatus - Google Patents
Filtering apparatus Download PDFInfo
- Publication number
- GB2262244A GB2262244A GB9211609A GB9211609A GB2262244A GB 2262244 A GB2262244 A GB 2262244A GB 9211609 A GB9211609 A GB 9211609A GB 9211609 A GB9211609 A GB 9211609A GB 2262244 A GB2262244 A GB 2262244A
- Authority
- GB
- United Kingdom
- Prior art keywords
- syphon
- filtering medium
- liquid
- contaminated liquid
- valve
- 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.)
- Granted
Links
Classifications
-
- 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
- B01D33/48—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps
- B01D33/50—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps with backwash arms, shoes or nozzles
-
- 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
- B01D33/70—Filters with filtering elements which move during the filtering operation having feed or discharge devices
- B01D33/705—Filters with filtering elements which move during the filtering operation having feed or discharge devices with internal recirculation through the filter
-
- 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
- B01D33/70—Filters with filtering elements which move during the filtering operation having feed or discharge devices
- B01D33/74—Filters with filtering elements which move during the filtering operation having feed or discharge devices for discharging filtrate
- B01D33/745—Construction of suction casings, pans, or the like
-
- 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
- B01D33/70—Filters with filtering elements which move during the filtering operation having feed or discharge devices
- B01D33/76—Filters with filtering elements which move during the filtering operation having feed or discharge devices for discharging the filter cake, e.g. chutes
- B01D33/763—Filters with filtering elements which move during the filtering operation having feed or discharge devices for discharging the filter cake, e.g. chutes for continuously discharging concentrated liquid
-
- 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
- B01D33/80—Accessories
- B01D33/801—Driving means, shaft packing systems or the like
-
- 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
- B01D33/80—Accessories
- B01D33/804—Accessories integrally combined with devices for controlling the filtration
- B01D33/807—Accessories integrally combined with devices for controlling the filtration by level measuring
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Filtration Of Liquid (AREA)
Abstract
A filtering apparatus comprises an endless, woven, synthetic filament filter belt whose lower run is moved through a tank (14) containing contaminated liquid by a drive means (18), while liquid is drawn upwards through the belt into the mouth (40) of a syphon (16) and delivered through a valve (46) to a tank (24). While the filter is operating the liquid level in tank (14) is maintained above the mouth (40) of the siphon by pumping contaminated liquid from tank (22) and allowing excess to flow back to tank (22) over an adjustable weir in tank (14). The belt is washed by fixed and oscillating sprays, fed from tank (24), and pump (52) also fills the siphon to start the filtering process. <IMAGE>
Description
Improvements in or relating to belt filters
This invention relates to a belt filter for removing contaminant from water or other liquids having a viscosity similar to that of water.
A common form of filter comprises a fine woven wire mesh which is static and is used as a gravity filter. The capacity of such a filter is restricted in its liquid handling capacity due to the surface tension that supports the droplets of liquid formed under the wire mesh. The smaller the droplets are the stronger the surface tension and the stronger the surface tension the bigger the resistance to flow through the filter. Also in such a situation the wire mesh will very quickly blind and close off or seriously restrict throughput of liquids to be filtered.
The present invention seeks to improve the water handling capacity of a belt filter by immersing the filter cloth in the liquid to be cleaned thereby removing surface tension, and moving the filter cloth through the contaminated liquid.
Accordingly the present invention provides a liquid filtration apparatus comprising an endless continuously movable filtering medium immersible in a container of contaminated liquid, driving means to move the filtering medium through the contaminated liquid, means for removing cleansed liquid from the filter and means for cleaning contaminants from the filtering medium.
Preferably the filtering medium comprises a fine woven synthetic wire mesh cloth belt.
The contaminated liquid container can have an inlet through which contaminated liquid is received and an outlet from which contaminated liquid is discharged and the level of contaminated liquid can be controlled by liquid level sensing means and a moveable weir located upstream of the outlet which functions in dependence of the signal from the liquid level sensing means.
The drive means can comprise two or more rubber covered rollers over which the endless filtering medium passes, one of the rollers being driven by a variable speed drive motor and another roller being adjustable in position to maintain tension in the filtering medium.
Preferably the drive roller is cambered.
The cleansed liquid removal means can comprise a syphon, the syphon including a syphon tube having a generally rectangular mouth in contact with the filtering medium in the contaminated liquid tank.
The mouth of the syphon tube can be provided with support bars in contact with the filtering medium, the support bars extending transversely to the direction of travel of the filtering medium.
The syphon has a drop leg terminating in a valve which can be controlled either by a ram and,or by a float valve.
The syphon includes a priming valve which allows clean water to be admitted into the syphon.
The cleansing means of the filtering medium can comprise a static array of water jets extending across the width of the filtering medium, and can also include a high pressure oscillating water jet.
The present invention will now be more particularly described with reference to the accompanying drawings in which;
Figure 1 shows a front elevation of one form of liquid filtration apparatus according to the present invention;
Figure 2 shows a section on line X-X in figure 1;
Figure 3 shows a detail of the syphon mouth of the apparatus shown in figures 1 and 2; and
Figure 4 shows a view on arrow A in figure 3.
Referring to the figures, a liquid filtration apparatus (10) suitable for the filtration of water or other liquids of a similar viscosity, comprises a framework (12) which supports a filtration tank (14), a syphon (16), and a drive means (18) for an endless wire mesh filter cloth belt (20). Tanks (22) and (24) respectively contain water to be filtered and filtered water, and both tanks are located under the framework (12) or at any convenient location.
For example the tank (22) can comprise the output from a process plant.
A pump (26) is connected in a pipeline (28) between outlet (30) of the tank (22) and inlet (32) of the tank (14). A movable weir (34) is provided upstream of the outlet (36) of the tank (14), the outlet (36) discharging into the tank or back to process (22).
The syphon (16) comprises a syphon tube (38) having a rectangular mouth (40) in contact with the filter cloth (20) and a drop leg (42) having an outlet (44). The outlet (44) is controlled by a ball-float valve (46), the position of whichiis controlled both by the level of water in the tank (24) and' ram (-48) which is pneumatically operated. The upper end of the leg (42) has a level controller indicating high and low level liquid levels (42A) and (42B) respectively.
The syphon (16) also has a de-aerating drop leg (50) the lower end of which is immersed in the water in the tank (24). The opposite end of the leg (50) is connected to the uppermost section of the syphon.
A pump (52) is located in ducting (54) leading from the tank (24) to the syphon drop-leg (42) via a priming valve (56), to process duty or discharge, and to static cloth cleaning fan jets (58).
A further pump (GO) and associated ducting (62j can be provided to supply clean water to a high pressure oscillating needle jet (64) to assist in the cleaning of the filter cloth (20).
The mouth (40) of the syphon tube (38) is provided with a plate (40A) formed with support bars (405) which extend normal to the direction of travel of the filter cloth (20). The support bars define slots (40B) which are inclined at approximately 450 to scrape clean water from the surface of the filter cloth (20) and to direct it in an upward direction.
The drive means (iS) comprises a pair of rubber covered rollers (64) (66). The roller (64) is in a fixed position, is cambered and provided with a variable speed drive motor (not shown). The roller (66) is movable relative to the supporting frame work (14) in order to maintain a substantially constant tension throughout the life of the wire cloth (20).
As will be seen from the figures, the wire cloth is held in position in the tank (22) by the mouth (40) of the syphon so that whilst the apparatus is in operation the filter cloth is submerged as it passes through the water to be cleaned.
A basin is created in the tank (22) by the edges of the filter cloth (20) being kept above the surface of the clean water by means of high density plastic friction pads (68) which are secured to the sides of the tank (22).
In operation the pump (26) draws dirty water from the supply tank (22) and the dirty water is pumped into the filtration tank (14).
Initially the weir (34) is raised and the filter cloth (20) which is being driven through the tank (14) by the drive roll (64) is submerged in the water in the tank (14). The syphon (16) is primed by lowering the weir (34) allowing water to be recycled into the tank (22) so that the level of water in the tank (14) is below the filter cloth (20). The pump (52) is operated and the priming valve (56) is opened pneumatically against a spring load in order to fill the syphon tube (38), whilst the valve (46) is closed by pneumatic operation of the ram (48). Any air in the syphon is forced out through the leg (52) which seated with water and prevents air from re-entering the syphon. The surface tension at the mouth (40) of the syphon tube (38) supports the water in the syphon tube until the syphon is filled and the outlet valve is opened.When the syphon tube (38) is filled, the syphon high level outputs a signal which raises the weir (34) and the level of water in the tank (14) is raised so that the filter cloth (20) is submerged. For example, the level of water in the tank (14) can be 50 - 75 mm above the level of the filter cloth.
When the operating level (67) in the tank (14) has been reached the outlet valve (46) in the syphon down leg (42) is opened by switching off the air of the ram (48), the priming valve (56) is closed and the suction drop leg (42) begins to pull filtered water through the filter cloth and deposit it in the tank (24).
The moving filter cloth (20) and syphon (16) will continue to filter clean water from the dirty water in the tank (14) provided that there is a continuous supply of dirty water and that the flow potential through the filter cloth is greater than that of the outlet valve (46).
If the filter cloth starts to blind over with contaminants, the syphon level will fall to level (42B) and will output a signal for the speed of the filter cloth drive motor to increase thereby providing a cleaner mesh to the extraction area.
If the syphon should be broken, the syphon level will again fall to level (42B), the valve (46) is automatically closed by the pneumatic ram (48), and the priming cycle will be re-started.
Throughout the operation of the filtering apparatus (10) the contaminants which have been filtered from the dirty liquid will be washed from the filter cloth by water pumped through the fan jets (58) and through the oscillating needle jet (64) if provided.
An alternative to the primary arrangement above is a vacuuminduced priming. In which case the syphon drop leg does not have a valve. Instead the drop leg is submerged at its base and control of extraction volume will be related to level differences between the tank (14) and tank (24).
A vacuum pump or fan would be necessary for the priming operation and valved-off when filter is in operation.
Claims (16)
1. A liquid filtration apparatus comprising an endless
continuously movable filtering medium immersible in a
container of contaminated liquid, driving means to move the
filtering medium through the contaminated liquid, means for
removing cleansed liquid from the filtering medium and
means for cleaning contaminants from the filtering medium.
2. An apparatus as claimed in claim 1 in which the filtering
medium comprises a fine synthetic woven wire mesh belt.
3. An apparatus as claimed in claim 1 or claim 2 in which the
contaminated liquid container has an inlet through which
contaminated liquid is received and an outlet from which
concentrated contaminated liquid is discharged, the level
of contaminated liquid being controlled by a liquid level
sensing means and a movable weir located upstream of the
outlet.
4. An apparatus as claimed in any one of the preceding claims
in which the drive means comprises two or more rollers over
which the endless filtering medium passes one of the
rollers being driven by variable speed drive motor and the
other roller being adjustable in position to maintain
tension in the filtering medium.
5. An apparatus as claimed in claim 4 in which the rollers are
rubber covered and the drive roller is cambered.
6. An apparatus as claimed in any one of the preceding claims
in which the cleansed liquid removal means comprises a
syphon.
7. An apparatus as claimed in claim 6 in which the syphon
includes a syphon tube having a generally rectangular mouth
in contact with the filtering medium in the contaminated
liquid tank.
8. An apparatus as claimed din claim 7 in which the mouth of
the syphon tube is provided with support bars in contact
with the filtering medium.
9. An apparatus as claimed in claim 7 or claim 8 in which the
syphon has a drop leg terminating in a valve.
10. An apparatus as claimed in claim 9 in which the valve can
be operated by a ram and, or by a float valve.
11. An apparatus as claimed in any one of claims 6 to 10 in
which the syphon includes a priming valve admitting clean
water to the syphon.
12. An apparatus as claimed in any one of the preceding claims
in which the cleaning means comprises a static array of
water jets extending across the width of the filtering
medium.
13. An apparatus as claimed in claim 12 in which the cleaning
means includes a high pressure oscillating water jet.
14. An apparatus as claimed in claim 7 or claim 8 in which the
syphon has a drop leg having its base submerged in a
container of the cleansed liquid, and suction means
connected to the syphon via a valve to the syphon.
14. A filtering apparatus constructed and arranged for use and
operation substantially as herein described and with
reference to the accompanying drawings.
Amendments to the claims have been filed as follows
Claims 1. A liquid filtration apparatus comprising an endless
continuously movable filtering medium, an advancing length
of which medium being immersible in a container of
contaminated liquid, driving means to move the filtering
medium through the contaminated liquid, means for cleaning
contaminants from the filtering medium and means for
removing cleansed liquid from the filtering medium from
above the filtering medium in the region of immersion in
the contaminated liquid.
2. An apparatus as claimed in claim 1 in which the filtering
medium comprises a fine synthetic woven wire mesh belt
arranged in the form of a dish in the region of the
immersion of the advancing length of the filtering medium
in the contaiminated liqud.
3. An apparatus as claimed in claim 1 or claim 2 in which the
contaminated liquid container has an inlet through which
contaminated liquid is received and an outlet from which
concentrated contaminated liquid is discharged, the level
of contaminated liquid being controlled by a liquid level
sensing means and a movable weir located upstream of the
outlet.
4. An apparatus as claimed in any one of the preceding claims
in which the drive means comprises two or more rollers over
which the endless filtering medium passes one of the
rollers being driven by variable speed drive motor and the
other roller being adjustable in position to maintain
tension in the filtering medium.
5. An apparatus as claimed in claim 4 in which the rollers are
rubber covered and the drive roller is cambered.
6. An apparatus as claimed in any one of the preceding claims
in which the cleansed liquid removal means comprises a
syphon.
7. An apparatus as claimed in any one of claims 4 to 6 in
which the rollers are supported above and clear of the
contaminated liquid level and the advancing length of the
filtering medium is depressed by the mouth of the syphon,
the syphon mouth being less in width than the filtering
medium thereby forcing the edges of the filtering medium to
turn up and remain above the level of the contaiminated
liquid, the edges of the filtering medium being maintained
in this configuration by contact strips on the sides of the
container.
8. An apparatus as claimed in claim 7 in which the syphon
includes a syphon tube having a generally rectangular
mouth.
9. An apparatus as claimed in claim 8 in which the mouth of
the syphon tube is provided with support bars in contact
with the filtering medium.
10. An apparatus as claimed in claim 8 or claim 9 in which the
syphon has a drop leg terminating in a valve.
11. An apparatus as claimed in claim 10 in which the valve can
be operated by a ram and, or by a float valve.
12. An apparatus as claimed in any one of claims 7 to 11 in
which the syphon includes a priming valve admitting clean
water to the syphon.
13. An apparatus as claimed in any one of the preceding claims
in which the cleaning means comprises a static array of
water jets extending across the width of the filtering
medium.
14. An apparatus as claimed in claim 13 in which the cleaning
means includes a high pressure oscillating water jet.
15. An apparatus as claimed in claim 8 or claim 9 in which the
syphon has a drop leg having its base submerged in a
container of the cleansed liquid, and suction means
connected to the syphon via a valve to the syphon.
16. A filtering apparatus constructed and arranged for use and
operation substantially as herein described and with
reference to the accompanying drawings.
Priority Applications (14)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US08/244,578 US5480544A (en) | 1991-12-05 | 1992-12-03 | Belt filters |
| DK92924780.7T DK0625066T3 (en) | 1991-12-05 | 1992-12-03 | improvements to or associated with band filters |
| AT92924780T ATE141820T1 (en) | 1991-12-05 | 1992-12-03 | IMPROVEMENTS TO OR RELATED TO BELT FILTERS |
| JP5510695A JPH07504842A (en) | 1991-12-05 | 1992-12-03 | Improvements in or related to belt filters |
| PCT/GB1992/002249 WO1993011850A1 (en) | 1991-12-05 | 1992-12-03 | Improvements in or relating to belt filters |
| CA002125163A CA2125163A1 (en) | 1991-12-05 | 1992-12-03 | Improvements in or relating to belt filters |
| ES92924780T ES2093859T3 (en) | 1991-12-05 | 1992-12-03 | IMPROVEMENTS, RELATED TO TAPE FILTERS. |
| AU30894/92A AU663544B2 (en) | 1991-12-05 | 1992-12-03 | Improvements in or relating to belt filters |
| DE69213258T DE69213258T2 (en) | 1991-12-05 | 1992-12-03 | IMPROVEMENTS ON OR REGARDING BELT FILTERS |
| EP92924780A EP0625066B1 (en) | 1991-12-05 | 1992-12-03 | Improvements in or relating to belt filters |
| BR9206872A BR9206872A (en) | 1991-12-05 | 1992-12-03 | Improvements in or relating to belt filters |
| FI942578A FI942578A (en) | 1991-12-05 | 1994-06-01 | Improvements to or related to belt filters |
| NO942077A NO302276B1 (en) | 1991-12-05 | 1994-06-03 | Enhancements to or associated with band filters |
| GR960402993T GR3021622T3 (en) | 1991-12-05 | 1996-11-14 | Improvements in or relating to belt filters. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB919125863A GB9125863D0 (en) | 1991-12-05 | 1991-12-05 | Meniscus free belt filter |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB9211609D0 GB9211609D0 (en) | 1992-07-15 |
| GB2262244A true GB2262244A (en) | 1993-06-16 |
| GB2262244B GB2262244B (en) | 1995-07-26 |
Family
ID=10705747
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB919125863A Pending GB9125863D0 (en) | 1991-12-05 | 1991-12-05 | Meniscus free belt filter |
| GB9211609A Expired - Fee Related GB2262244B (en) | 1991-12-05 | 1992-06-02 | Improvements in or relating to belt filters |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB919125863A Pending GB9125863D0 (en) | 1991-12-05 | 1991-12-05 | Meniscus free belt filter |
Country Status (1)
| Country | Link |
|---|---|
| GB (2) | GB9125863D0 (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB510832A (en) * | 1938-09-24 | 1939-08-09 | Fritz Kienzie | Improved methods of and apparatus for separating solids from a dispersion thereof in a liquid and for producing a web of material from such a dispersion |
| GB953483A (en) * | 1962-04-17 | 1964-03-25 | Hugh Robert Black | Apparatus for removing solids and semi-solid materials from solutions |
| GB1280602A (en) * | 1969-01-28 | 1972-07-05 | Fmc Corp | Removal of solid particles from suspension in a liquid |
| GB1330909A (en) * | 1969-10-14 | 1973-09-19 | American Air Filter Co | Liquid filter apparatus |
| GB2138310A (en) * | 1983-04-22 | 1984-10-24 | Techno Pack | Filtering cleaning liquor |
-
1991
- 1991-12-05 GB GB919125863A patent/GB9125863D0/en active Pending
-
1992
- 1992-06-02 GB GB9211609A patent/GB2262244B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB510832A (en) * | 1938-09-24 | 1939-08-09 | Fritz Kienzie | Improved methods of and apparatus for separating solids from a dispersion thereof in a liquid and for producing a web of material from such a dispersion |
| GB953483A (en) * | 1962-04-17 | 1964-03-25 | Hugh Robert Black | Apparatus for removing solids and semi-solid materials from solutions |
| GB1280602A (en) * | 1969-01-28 | 1972-07-05 | Fmc Corp | Removal of solid particles from suspension in a liquid |
| GB1330909A (en) * | 1969-10-14 | 1973-09-19 | American Air Filter Co | Liquid filter apparatus |
| GB2138310A (en) * | 1983-04-22 | 1984-10-24 | Techno Pack | Filtering cleaning liquor |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9211609D0 (en) | 1992-07-15 |
| GB9125863D0 (en) | 1992-02-05 |
| GB2262244B (en) | 1995-07-26 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20010602 |