WO1981001665A1 - Device at chamber filter press and a method of using the device - Google Patents
Device at chamber filter press and a method of using the device Download PDFInfo
- Publication number
- WO1981001665A1 WO1981001665A1 PCT/SE1980/000321 SE8000321W WO8101665A1 WO 1981001665 A1 WO1981001665 A1 WO 1981001665A1 SE 8000321 W SE8000321 W SE 8000321W WO 8101665 A1 WO8101665 A1 WO 8101665A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- filter
- cloth
- plate
- cake
- membranes
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D25/00—Filters formed by clamping together several filtering elements or parts of such elements
- B01D25/12—Filter presses, i.e. of the plate or plate and frame type
- B01D25/164—Chamber-plate presses, i.e. the sides of the filtering elements being clamped between two successive filtering plates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D25/00—Filters formed by clamping together several filtering elements or parts of such elements
- B01D25/12—Filter presses, i.e. of the plate or plate and frame type
- B01D25/172—Plate spreading means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D25/00—Filters formed by clamping together several filtering elements or parts of such elements
- B01D25/32—Removal of the filter cakes
- B01D25/34—Removal of the filter cakes by moving, e.g. rotating, the filter elements
Definitions
- Dewatering can be effected, for example, in a chamber filter press, whereby a higher dry content and thereby a substantial reduction of the sludge volume is obtained.
- the present invention has the object to facilitate the utilization of a chamber filter press in connection with the dewatering of waste sludge, and particularly to facilitate the removal of the sludge cakes from the filter plates and clothes.
- This object is achieved according to the invention, in that between a filter cloth covering the plate and the plate one or more membranes are provided, which cover only a part of the total filter plate surface, and which by supply of a medium under pressure can be expanded from the compressed position assumed at the pressing so as to extend or bulge the filter cloth so that the contact surface between the cloth and the filter cake decreases, and thereby also the adherence of the filter cake on the cloth decreases, so that the filter cake due to gravity detaches from the cloth and plate.
- the membranes preferably can have the form of hoses, and the expansion is effected by compressed air.
- rubber membranes can alternatingly be filled with air and emptied. The pulsating motion to which the filter clothes thereby are subjected, causes vibrations of the sludge cake, which thereby loosens.
- the invention implies the possibility of separating several (possibly all) filter plates from each other at the same time, whereby the time required for emptying is reduced substantially.
- the mechanism for moving the plates besides, can be simple because it can be based on compressed air.
- the movable parts even can be restricted to be only the plates, and the membrane motion is utilized for separating the plates.
- Fig. 1 is a schematic lateral view of some filter plates in a chamber filter press
- Fig . 2 is a front view of a filter plate
- Fig . 3 is a lateral sectional view in greater detail
- Fig . 4 is a sectional view of two filter plates and an intermediate filter cake
- Fig . 5 shows a complementary separation device.
- the chamber filter press shown in Fig. 1 schematically comprises a stand 11, in which a plurality of filter plates 1 are flexibly suspended.
- the filter plate package is com pressed for pressing out the water by means of a hydraulic piston 12 and an intermediate plate 13.
- each filter plate 1 includes on each side cupped recesses 2 so that only a wide edge remains which extends all about.
- Each filter plate 1 is coated on both sides with filter cloth 3, which is stretched so loosely that it can be pressed into the cupped recess 2 in the filter plate 1.
- the filter cloth is attached to the filter plate along the edge extending all about and to the centre of the recess 2.
- In the filter plate drain passageways are arranged, which are shown schematically in the form of a tap at 4.
- each recess 2 in the respective filter plate two (or more) soft rubber hoses 5 are provided, one on each side of the central attachment point of the filter cloth.
- the rubber hoses 5 are connected to sealed air passageways 15, which extend through the edges of the filter plate 1 out to compressed air connections (not shown).
- the hoses 5 are closed at their opposite ends.
- the membranes have designs other than rubber hoses, and also the pressure medium may be another one than air.
- a wheel 9 can be used which is located above the filter plates and upon rotation moves one plate at a time, in that a recess 10 in the wheel hooks on a pin attached to the respective filter plate.
- the distance, through which each plate is moved, is determined by the wheel diameter.
- the wheel is fixed in vertical direction and moves horizontally when a plate is being moved, whereby the plate next in turn is moved at the next wheel rotation.
- This complementary opening mechanism is particularly motivated when the filter press has great length, because then the force from the membranes may not be sufficient for the distribution of the filter plates.
- FIG. 5 appears in detail how the filter plates are flexibly suspended on horizontal, horizontally movable pins 7 via strips or the like 8.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Filtration Of Liquid (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
- Fluid-Pressure Circuits (AREA)
- Valves And Accessory Devices For Braking Systems (AREA)
Abstract
A device at a chamber filter press for releasing sludge pressed to filter cakes, which release is effected in that between filter plate (1) and filter cloth (3) rubber hoses (5) are arranged, which when the filter cake is to be released are expanded by compressed air, so that the filter cake is released from the filter plate.
Description
DEVICE AT CHAMBER FILTER PRESS AND A METHOD USING THE DEVICE
When municipal as well as industrial waste water or process water is treated, generally a sludge is formed. In many cases reduction of the moisture content (increase of dry content) of this sludge is desired before the sludge is deposited, transported or applied to further use.
Dewatering can be effected, for example, in a chamber filter press, whereby a higher dry content and thereby a substantial reduction of the sludge volume is obtained.
Unfortunately, however, when us-ing the chamber filter press for the treatment of waste sludge, a relatively large amount of manual work is required for removing the compressed dry sludge cakes, which have been formed between the filter-cloth coated filter plates in the chamber filter press. The present invention, therefore, has the object to facilitate the utilization of a chamber filter press in connection with the dewatering of waste sludge, and particularly to facilitate the removal of the sludge cakes from the filter plates and clothes.
This object is achieved according to the invention, in that between a filter cloth covering the plate and the plate one or more membranes are provided, which cover only a part of the total filter plate surface, and which by supply of a medium under pressure can be expanded from the compressed position assumed at the pressing so as to extend or bulge the filter cloth so that the contact surface between the cloth and the filter cake decreases, and thereby also the adherence of the filter cake on the cloth decreases, so that the filter cake due to gravity detaches from the cloth and plate.
The membranes preferably can have the form of hoses, and the expansion is effected by compressed air.
In order to ensure the emptying of the chamber filter press (dropping of the sludge cakes), within the scope of the invention rubber membranes can alternatingly be filled with air and emptied. The pulsating motion to which the filter clothes thereby are subjected, causes vibrations of the sludge cake, which thereby loosens.
It is to be observed that the invention implies the possibility of separating several (possibly all) filter plates from each other at the same time, whereby the time required for emptying is reduced substantially. The mechanism for moving the plates, besides, can be simple because it can be based on compressed air. The movable parts even can be restricted to be only the plates, and the membrane motion is utilized for separating the plates.
The invention is described in greater detail in the following by way of an embodiment, with reference to the accompanying drawings, in which
Fig. 1 is a schematic lateral view of some filter plates in a chamber filter press,
Fig . 2 is a front view of a filter plate,
Fig . 3 is a lateral sectional view in greater detail,
Fig . 4 is a sectional view of two filter plates and an intermediate filter cake, and
Fig . 5 shows a complementary separation device.
The chamber filter press shown in Fig. 1 schematically comprises a stand 11, in which a plurality of filter plates 1 are flexibly suspended. When the spaces between the filter plates have been filled with sludge, the filter plate package is com pressed for pressing out the water by means of a hydraulic piston 12 and an intermediate plate 13.
As appears from Figs. 2 - 4, each filter plate 1 includes on each side cupped recesses 2 so that only a wide edge remains which extends all about. Each filter plate 1 is coated on both sides with filter cloth 3, which is stretched so loosely that it can be pressed into the cupped recess 2 in the filter plate 1. The filter cloth is attached to the filter plate along the edge extending all about and to the centre of the recess 2. In the filter plate drain passageways are arranged, which are shown schematically in the form of a tap at 4.
In each recess 2 in the respective filter plate two (or more) soft rubber hoses 5 are provided, one on each side of the central attachment point of the filter cloth. The rubber hoses 5 are connected to sealed air passageways 15, which extend through the edges of the filter plate 1 out to compressed air connections (not shown). The hoses 5 are closed at their opposite ends.
When after a completed pressing cycle the respective filter cakes are to be released from the filter plates, the rubber hoses 5, which are completely compressed, are filled with compressed air via the air passageways 15, so that the hoses expand and stretch the filter cloth outward from the filter plate, as shown in Fig. 4. Hereby the possible contact surface between the completely pressed filter cake and the filter cloth decreases, and the filter cake, therefore, easily can drop down from the filter plate. In Fig. 4 is shown just when the filter cake has been released from the adjacent filter plates. Due to the rubber hoses 5 being sealed at their free ends, compressed air cannot leak out and, respectively, press water cannot enter. It is, however, also imaginable that the two hoses are united to one hose.
It can, of course, be imagined within the scope of the invention that the membranes have designs other than rubber hoses,
and also the pressure medium may be another one than air.
As an alternative to the "opening" or separation of the filter plates as described above, a wheel 9 can be used which is located above the filter plates and upon rotation moves one plate at a time, in that a recess 10 in the wheel hooks on a pin attached to the respective filter plate. The distance, through which each plate is moved, is determined by the wheel diameter. The wheel is fixed in vertical direction and moves horizontally when a plate is being moved, whereby the plate next in turn is moved at the next wheel rotation. This complementary opening mechanism is particularly motivated when the filter press has great length, because then the force from the membranes may not be sufficient for the distribution of the filter plates.
From Fig. 5 appears in detail how the filter plates are flexibly suspended on horizontal, horizontally movable pins 7 via strips or the like 8.
Claims
1. A device at a filter press for releasing the filter cakes from corresponding filter plates after completed pressing, c h a r a c t e r i z e d i n that between a filter cloth (2) covering the plate (1) and the plate one or more membranes (5) are- located, which cover only a small part of the total surface of the filter plate (1), and which from the compressed position assumed at the pressing are expanded by supply of a medium under pressure so as to stretch or bulge the filter cloth (2), so that the contact surface between the cloth and the filter cake (6) decreases, and also the adherence of the filter cake (6) on the cloth (2) decreases, so that the filter cake (6) by action of gravity is detached from the cloth and the cake.
2. A device as defined in claim 1, c-h a r a c t e r i z e di n that the membrane or membranes (5) are hoses.
3. A method of using the device according to any one of the claims 1 or 2, c h a r a c t e r i z e d i n that the membranes (5) are supplied with pressure medium in shocks or alternatingly, so that the cake is pushed or vibrated off the cloth and plate.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE7910058A SE7910058L (en) | 1979-12-06 | 1979-12-06 | DEVICE FOR CAMERA FILTER PRESSURE |
SE7910058 | 1979-12-06 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1981001665A1 true WO1981001665A1 (en) | 1981-06-25 |
Family
ID=20339488
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/SE1980/000321 WO1981001665A1 (en) | 1979-12-06 | 1980-12-05 | Device at chamber filter press and a method of using the device |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0041532A1 (en) |
FI (1) | FI803798L (en) |
NO (1) | NO812652L (en) |
SE (1) | SE7910058L (en) |
WO (1) | WO1981001665A1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0284906A1 (en) * | 1987-03-28 | 1988-10-05 | RITTERSHAUS & BLECHER GMBH | Chamber filter press |
CN108434802A (en) * | 2018-06-29 | 2018-08-24 | 江雪萍 | A kind of large size city sludge of sewage treatment plant filter-pressing device |
CN109011748A (en) * | 2018-09-07 | 2018-12-18 | 安徽金贺财建筑工程有限公司 | A kind of efficient membrane filter plate filter press |
CN112807789A (en) * | 2020-12-18 | 2021-05-18 | 濮琴兰 | Filter plate of filter |
Citations (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB829944A (en) * | 1955-03-29 | 1960-03-09 | Otto Emele | Process and apparatus for desiccating moist material |
DE1184324B (en) * | 1961-10-12 | 1964-12-31 | Otto Emele | Filter press with filter plates designed to automatically detach the filter cake |
DE1201812B (en) * | 1963-04-10 | 1965-09-30 | Otto Emele | Filter press plate for self-releasing the filter cake |
US3270887A (en) * | 1960-12-12 | 1966-09-06 | Almasfuezitoei Timfoeldgyar | Filter presses for separating solids from liquids |
US3347383A (en) * | 1965-11-19 | 1967-10-17 | Shriver & Company Inc T | Filter press |
US3402667A (en) * | 1967-04-03 | 1968-09-24 | Panther Pumps & Equipment Co | Fluid power transfer apparatus |
GB1229039A (en) * | 1967-09-27 | 1971-04-21 | ||
DE2257690A1 (en) * | 1972-11-24 | 1974-05-30 | Walter Beck Kg Kontroll Und Fe | HYDRAULIC OR COMPRESSED AIR ACTUATED CLOSED DIAPHRAGM HUB JACK |
SE372797B (en) * | 1970-12-21 | 1975-01-13 | J Wagner | |
SE389697B (en) * | 1975-04-07 | 1976-11-15 | G A Nilsson | PRINT MEDIA POWER MECHANISM |
DE2535524A1 (en) * | 1975-08-08 | 1977-02-10 | Knorr Bremse Gmbh | ACTUATION CYLINDERS, IN PARTICULAR LIFTING CYLINDERS FOR RAIL BRAKE MAGNETS |
-
1979
- 1979-12-06 SE SE7910058A patent/SE7910058L/en not_active Application Discontinuation
-
1980
- 1980-12-05 FI FI803798A patent/FI803798L/en not_active Application Discontinuation
- 1980-12-05 WO PCT/SE1980/000321 patent/WO1981001665A1/en not_active Application Discontinuation
- 1980-12-05 EP EP81900025A patent/EP0041532A1/en not_active Withdrawn
-
1981
- 1981-08-05 NO NO812652A patent/NO812652L/en unknown
Patent Citations (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB829944A (en) * | 1955-03-29 | 1960-03-09 | Otto Emele | Process and apparatus for desiccating moist material |
US3270887A (en) * | 1960-12-12 | 1966-09-06 | Almasfuezitoei Timfoeldgyar | Filter presses for separating solids from liquids |
DE1184324B (en) * | 1961-10-12 | 1964-12-31 | Otto Emele | Filter press with filter plates designed to automatically detach the filter cake |
DE1201812B (en) * | 1963-04-10 | 1965-09-30 | Otto Emele | Filter press plate for self-releasing the filter cake |
US3347383A (en) * | 1965-11-19 | 1967-10-17 | Shriver & Company Inc T | Filter press |
US3402667A (en) * | 1967-04-03 | 1968-09-24 | Panther Pumps & Equipment Co | Fluid power transfer apparatus |
GB1229039A (en) * | 1967-09-27 | 1971-04-21 | ||
SE372797B (en) * | 1970-12-21 | 1975-01-13 | J Wagner | |
DE2257690A1 (en) * | 1972-11-24 | 1974-05-30 | Walter Beck Kg Kontroll Und Fe | HYDRAULIC OR COMPRESSED AIR ACTUATED CLOSED DIAPHRAGM HUB JACK |
SE389697B (en) * | 1975-04-07 | 1976-11-15 | G A Nilsson | PRINT MEDIA POWER MECHANISM |
DE2535524A1 (en) * | 1975-08-08 | 1977-02-10 | Knorr Bremse Gmbh | ACTUATION CYLINDERS, IN PARTICULAR LIFTING CYLINDERS FOR RAIL BRAKE MAGNETS |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0284906A1 (en) * | 1987-03-28 | 1988-10-05 | RITTERSHAUS & BLECHER GMBH | Chamber filter press |
CN108434802A (en) * | 2018-06-29 | 2018-08-24 | 江雪萍 | A kind of large size city sludge of sewage treatment plant filter-pressing device |
CN112221216A (en) * | 2018-06-29 | 2021-01-15 | 谢婷婷 | Sludge filter pressing device for large-scale municipal sewage treatment plant |
CN112221216B (en) * | 2018-06-29 | 2021-11-30 | 邳州市景鹏创业投资有限公司 | Sludge filter pressing device for large-scale municipal sewage treatment plant |
CN109011748A (en) * | 2018-09-07 | 2018-12-18 | 安徽金贺财建筑工程有限公司 | A kind of efficient membrane filter plate filter press |
CN112807789A (en) * | 2020-12-18 | 2021-05-18 | 濮琴兰 | Filter plate of filter |
CN112807789B (en) * | 2020-12-18 | 2022-12-13 | 濮琴兰 | Filter plate of filter |
Also Published As
Publication number | Publication date |
---|---|
EP0041532A1 (en) | 1981-12-16 |
NO812652L (en) | 1981-08-05 |
FI803798L (en) | 1981-06-07 |
SE7910058L (en) | 1981-06-07 |
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