CA1217675A - Continuous-operation filtration technique and equipment - Google Patents
Continuous-operation filtration technique and equipmentInfo
- Publication number
- CA1217675A CA1217675A CA000425204A CA425204A CA1217675A CA 1217675 A CA1217675 A CA 1217675A CA 000425204 A CA000425204 A CA 000425204A CA 425204 A CA425204 A CA 425204A CA 1217675 A CA1217675 A CA 1217675A
- Authority
- CA
- Canada
- Prior art keywords
- cloth
- sludge
- feeding
- filtration
- unit
- 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
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B9/00—Presses specially adapted for particular purposes
- B30B9/02—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material
- B30B9/24—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material using an endless pressing band
- B30B9/245—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material using an endless pressing band the edges of the band being folded over the material
-
- 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
- B01D33/056—Construction of filtering bands or supporting belts, e.g. devices for centering, mounting or sealing the filtering bands or the supporting belts
- B01D33/0565—Construction of filtering bands or supporting belts, e.g. devices for centering, mounting or sealing the filtering bands or the supporting belts combined with means to fasten the opposite edges of the filtering band together, e.g. Zipper
-
- 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
- B01D33/58—Handling the filter cake in the filter for purposes other than for regenerating the filter cake remaining on the filtering element
- B01D33/62—Handling the filter cake in the filter for purposes other than for regenerating the filter cake remaining on the filtering element for drying
- B01D33/64—Handling the filter cake in the filter for purposes other than for regenerating the filter cake remaining on the filtering element for drying by compression
- B01D33/642—Handling the filter cake in the filter for purposes other than for regenerating the filter cake remaining on the filtering element for drying by compression by pressure belts
-
- 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
- B01D33/58—Handling the filter cake in the filter for purposes other than for regenerating the filter cake remaining on the filtering element
- B01D33/62—Handling the filter cake in the filter for purposes other than for regenerating the filter cake remaining on the filtering element for drying
- B01D33/64—Handling the filter cake in the filter for purposes other than for regenerating the filter cake remaining on the filtering element for drying by compression
- B01D33/646—Handling the filter cake in the filter for purposes other than for regenerating the filter cake remaining on the filtering element for drying by compression by pressure rollers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B9/00—Presses specially adapted for particular purposes
- B30B9/02—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material
- B30B9/24—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material using an endless pressing band
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Filtration Of Liquid (AREA)
- Treatment Of Sludge (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
The invention constitutes a continuous-operation filtration technique as well as equiment employing this technique. The invention effects filtration by means of a moving, endless filter cloth (1) or other filter medium onto which the sludge (3) to be filtered is fed by two feeding units (2) and from which the resulting solid matter (6) is removed by removal units (5) lo-cated after the feeding units. The feeding units (2) are so positioned the the the sludge (3) is fed on the different sides of the cloth (1) , which means that the liquid passing through the cloth removes the solid matter that the preceding removal unit failed to remove. In order to accelerate filtration and make cleaning more effective, the sludge (3) can be compressed by means of a moving compressing belt (8) or rollers which force the cloth into a bag-shaped form between the feeding and removal units.
Fig. 1
The invention constitutes a continuous-operation filtration technique as well as equiment employing this technique. The invention effects filtration by means of a moving, endless filter cloth (1) or other filter medium onto which the sludge (3) to be filtered is fed by two feeding units (2) and from which the resulting solid matter (6) is removed by removal units (5) lo-cated after the feeding units. The feeding units (2) are so positioned the the the sludge (3) is fed on the different sides of the cloth (1) , which means that the liquid passing through the cloth removes the solid matter that the preceding removal unit failed to remove. In order to accelerate filtration and make cleaning more effective, the sludge (3) can be compressed by means of a moving compressing belt (8) or rollers which force the cloth into a bag-shaped form between the feeding and removal units.
Fig. 1
Description
I
CONTI~UOUS-OP~RATION FILTRATION TECHNIQUE END EQUIPMENT
This invention is designed as a continuous operation filtration technique that employs a moving endless fitter cloth or similar onto which the sludge is fed at a certain feeding point and from which the solid cake is removed at a later point, in regard to the direction of rotation of the cloth.
In order to obtain high efficiency, it is of vital importance that the properties of the filter cloth, screen or other medium remain as constant as possible throughout the process. One gent oral disadvantage of known filtration techniques in continuous operation is the rapid blocking of the filter cloth which is caused by particles embedding in the cloth. For this reason, the filter cloth must be continuously washed during the process, which can be done most effectively by means of the so called reversed flow method.
The purpose of this invention is to provide a continuous-oper-anion filtration technique in which the filter cloth or other filter medium is cleaned by employing the reversed flow method in a simpler and more effective way than before. It is kirk-touristic of the invention that sludge is fed onto the cloth at two points on different sides of the cloth; consequently, the particles that the removal unit fails to remove are washed away by the liquid passing through the cloth. In other words, this invention makes it possible to clean the cloth automatically in the course of the process wherefore no special cleaning open-anions are required.
As such, the idea of using both sides of the filter cloth is a known method The filtration process referred to does not, how-ever, involve continuous operation, nor is the associated equip-mint so designed as to provide sufficient cleaning by means of the process itself. Therefore, the equipment is fitted with separate cleaning devices which spray cleaning agent on both sides of the cloth between filtration phases. This new invention does not require such cleaning devices, although they can be used in addition to the reversed flow.
Characteristic of one of the applications of this invention is that the sludge to be filtered is compressed by an upper belt which moves in the same direction as the cloth, along the length of the cloth from where the sludge is introduced to where the cake is removed. Pressure accelerates the separation of liquid from solid particles in the sludge, effecting a powerful flow of liquid through the cloth, which, in turn, removes the remaining solid material from the other side of the cloth.
Characteristic of another application of this invention is that pressure is applied to the sludge between the feeding and removal points by means of rollers which force the filter cloth into a bag-shaped form. In this way, sludge is prevented from escaping ..,',~.
owe do sideways, which is particularly important if the internal fake-lion of solid particles is low.
The invention involves also equipment designed to utilize the continuous-operation filtration technique described above This equipment comprises a moving endless filter cloth, devices for feeding the sludge on-to the cloth at a certain point as well as devices for removal of the solid cake from the cloth at a certain point which is located further on in the direction of rotation of the cloth; it is characteristic of the equipment that it has two separate feeding points and two separate removal points, so positioned that sludge is fed on different sides of the cloth at the two points, thus allowing the liquid passing through the cloth to remove the solid matter that the removal unit failed to remove.
The equipment designed on the basis of this invention can come prose a compressing belt which moves in the same direction as the cloth between the feeding unit and the removal unit, or the equipment can be fitted with rollers, placed between the feeding and removal units which apply pressure on the sludge by forcing the cloth into a bag-shaped form.
The invention is presented in detail by means of the following examples in which reference is made to the enclosed drawings where Figure 1 shows one type of filtration equipment based on the invention; sludge is compressed by means of a belt `
Figure 2 shows II-II cross section of figure 1 Figure 3 depicts another filtration equipment based on -the invention; the filter cloth is forced into a bag-shaped form when pressure is applied on the sludge Figure 4 shows IV-IV cross section of figure 3 figure 5 shows V-V cross section of figure 3 Figure 6 shows VI-VI cross section of figure 3 and Figure 7 shows the equipment depicted in figure 3 from above Figures 1 and 2 show the filtration equipment in which ultra lion is effected by means of the continuous-operation filtration cloth the equipment comprises two feeding units (2) which feed the sludge (3) through pipes (4) onto the cloth (1). Both feeding units (2) are succeeded by removal units (5) which remove the solid cake (6) prom the cloth (1) by means of a scraper.
Between the feeding and removal units, the sludge is compressed by the pressing belt (8) , or by rollers (9), which move in the same direction as the cloth (1), ; additional support is provided by the support belt (10) moving under the cloth. When the sludge is coy pressed, the liquid passes through the filter cloth (1) and support belt (10), as indicated by the arrows (11) in figure 1.
The essential point in the filtration process described in figures 1 and 2 is that the sludge (3) is fed by the feeding units (2) onto different sides of the cloth I In this process, the liquid, separated from the sludge (3) and passing through the cloth (1), removes the solid matter embedded in the cloth in the preceding phase of filtration. Thus the process provides reversed flow cleaning of the cloth, and no separate cleaning unit is required.
The filtration process described in figures 3 - 7 differs from the one presented in figures 1 and 2 in that the filter cloth (1), and the net-like belt supporting it, are forced into a bag-shaped form between the feeding and removal units. This is achieved by means of rollers (12) which simultaneously effect the separation of liquid from solid matter as indicated by arrows (11) in figures 3 - 6. reversed flow cleaning of the cloth takes place as described above; this process is especially suitable for sludges with low internal friction which can in this way be retained on the cloth during the compressing phase.
I-t is obvious to a professional that the applications of the invention are not confined to the examples presented above; they may vary within the framework of the enclosed patent claims.
CONTI~UOUS-OP~RATION FILTRATION TECHNIQUE END EQUIPMENT
This invention is designed as a continuous operation filtration technique that employs a moving endless fitter cloth or similar onto which the sludge is fed at a certain feeding point and from which the solid cake is removed at a later point, in regard to the direction of rotation of the cloth.
In order to obtain high efficiency, it is of vital importance that the properties of the filter cloth, screen or other medium remain as constant as possible throughout the process. One gent oral disadvantage of known filtration techniques in continuous operation is the rapid blocking of the filter cloth which is caused by particles embedding in the cloth. For this reason, the filter cloth must be continuously washed during the process, which can be done most effectively by means of the so called reversed flow method.
The purpose of this invention is to provide a continuous-oper-anion filtration technique in which the filter cloth or other filter medium is cleaned by employing the reversed flow method in a simpler and more effective way than before. It is kirk-touristic of the invention that sludge is fed onto the cloth at two points on different sides of the cloth; consequently, the particles that the removal unit fails to remove are washed away by the liquid passing through the cloth. In other words, this invention makes it possible to clean the cloth automatically in the course of the process wherefore no special cleaning open-anions are required.
As such, the idea of using both sides of the filter cloth is a known method The filtration process referred to does not, how-ever, involve continuous operation, nor is the associated equip-mint so designed as to provide sufficient cleaning by means of the process itself. Therefore, the equipment is fitted with separate cleaning devices which spray cleaning agent on both sides of the cloth between filtration phases. This new invention does not require such cleaning devices, although they can be used in addition to the reversed flow.
Characteristic of one of the applications of this invention is that the sludge to be filtered is compressed by an upper belt which moves in the same direction as the cloth, along the length of the cloth from where the sludge is introduced to where the cake is removed. Pressure accelerates the separation of liquid from solid particles in the sludge, effecting a powerful flow of liquid through the cloth, which, in turn, removes the remaining solid material from the other side of the cloth.
Characteristic of another application of this invention is that pressure is applied to the sludge between the feeding and removal points by means of rollers which force the filter cloth into a bag-shaped form. In this way, sludge is prevented from escaping ..,',~.
owe do sideways, which is particularly important if the internal fake-lion of solid particles is low.
The invention involves also equipment designed to utilize the continuous-operation filtration technique described above This equipment comprises a moving endless filter cloth, devices for feeding the sludge on-to the cloth at a certain point as well as devices for removal of the solid cake from the cloth at a certain point which is located further on in the direction of rotation of the cloth; it is characteristic of the equipment that it has two separate feeding points and two separate removal points, so positioned that sludge is fed on different sides of the cloth at the two points, thus allowing the liquid passing through the cloth to remove the solid matter that the removal unit failed to remove.
The equipment designed on the basis of this invention can come prose a compressing belt which moves in the same direction as the cloth between the feeding unit and the removal unit, or the equipment can be fitted with rollers, placed between the feeding and removal units which apply pressure on the sludge by forcing the cloth into a bag-shaped form.
The invention is presented in detail by means of the following examples in which reference is made to the enclosed drawings where Figure 1 shows one type of filtration equipment based on the invention; sludge is compressed by means of a belt `
Figure 2 shows II-II cross section of figure 1 Figure 3 depicts another filtration equipment based on -the invention; the filter cloth is forced into a bag-shaped form when pressure is applied on the sludge Figure 4 shows IV-IV cross section of figure 3 figure 5 shows V-V cross section of figure 3 Figure 6 shows VI-VI cross section of figure 3 and Figure 7 shows the equipment depicted in figure 3 from above Figures 1 and 2 show the filtration equipment in which ultra lion is effected by means of the continuous-operation filtration cloth the equipment comprises two feeding units (2) which feed the sludge (3) through pipes (4) onto the cloth (1). Both feeding units (2) are succeeded by removal units (5) which remove the solid cake (6) prom the cloth (1) by means of a scraper.
Between the feeding and removal units, the sludge is compressed by the pressing belt (8) , or by rollers (9), which move in the same direction as the cloth (1), ; additional support is provided by the support belt (10) moving under the cloth. When the sludge is coy pressed, the liquid passes through the filter cloth (1) and support belt (10), as indicated by the arrows (11) in figure 1.
The essential point in the filtration process described in figures 1 and 2 is that the sludge (3) is fed by the feeding units (2) onto different sides of the cloth I In this process, the liquid, separated from the sludge (3) and passing through the cloth (1), removes the solid matter embedded in the cloth in the preceding phase of filtration. Thus the process provides reversed flow cleaning of the cloth, and no separate cleaning unit is required.
The filtration process described in figures 3 - 7 differs from the one presented in figures 1 and 2 in that the filter cloth (1), and the net-like belt supporting it, are forced into a bag-shaped form between the feeding and removal units. This is achieved by means of rollers (12) which simultaneously effect the separation of liquid from solid matter as indicated by arrows (11) in figures 3 - 6. reversed flow cleaning of the cloth takes place as described above; this process is especially suitable for sludges with low internal friction which can in this way be retained on the cloth during the compressing phase.
I-t is obvious to a professional that the applications of the invention are not confined to the examples presented above; they may vary within the framework of the enclosed patent claims.
Claims (6)
1. Continuous operation filtration process employing a moving, endless filter cloth or similiar onto with the sludge to be filtered is fed by a feeding unit at one point and from which the resulting solid cake is removed by a removal unit located Further on in the direction of rotation of the cloth, said process comprising feeding the sludge onto the cloth by two separate feeding units in such away that the sludge is deposit-ed on different sides of the cloth wherefore the liquid filter-ing through the cloth removes the solid matter from the other side of the cloth that the preceding removal unit failed to re-move.
2. Filtration process in accordance with claim 1, wherein the sludge is compressed between the feeding unit and removal unit by a pressing belt moving in the same direction as the cloth.
3. Filtration process in accordance with claim 1, wherein the sludge is pressed between the feeding unit and removal unit by rollers which force the cloth into a bag-shaped form.
4. Equipment for carrying out the filtration process as described in claim 1, comprising a moving, endless filter cloth, devices for feeding the sludge to be filtered onto the cloth at a certain point as well as devices for removing the resulting solid cake from the cloth at a certain point succeeding the feeding unit; the equipment comprising two separate feeding units with two succeeding removal units, so positioned that the sludge is fed onto the cloth on different sides whereupon the liquid filtering through cloth removes the solid matter that the preceding removal unit failed to remove from the cloth.
5. Filtration equipment in accordance with claim 4, wherein there is provided a compressing belt which applies pressure to the sludge and moves in the same direction as the the filter cloth between the feeding unit and the removal unit.
6. Filtration equipment in accordance with claim 4, wherein there are rollers located between the feeding unit and re-moval unit, which apply processor on the sludge and force the cloth into a bag-shaped form.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI821147 | 1982-04-02 | ||
| FI821147A FI65378C (en) | 1982-04-02 | 1982-04-02 | KONTINUERLIGT FILTRERINGSFOERFARANDE OCH -ANORDNING |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1217675A true CA1217675A (en) | 1987-02-10 |
Family
ID=8515296
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000425204A Expired CA1217675A (en) | 1982-04-02 | 1983-04-05 | Continuous-operation filtration technique and equipment |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JPS6035240B2 (en) |
| CA (1) | CA1217675A (en) |
| DE (1) | DE3311869A1 (en) |
| FI (1) | FI65378C (en) |
| GB (1) | GB2117659B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT380643B (en) * | 1985-01-30 | 1986-06-25 | Andritz Ag Maschf | BELT FILTER PRESS |
| JPS63294958A (en) * | 1987-05-26 | 1988-12-01 | Kinki Seisakusho:Kk | Spray gun |
| JPH0738960B2 (en) * | 1987-09-09 | 1995-05-01 | 大成建設株式会社 | Method and apparatus for detecting opening / closing of automatic airless spray gun |
| US5456832A (en) * | 1993-12-28 | 1995-10-10 | Komline-Sanderson Engineering Corp. | Apparatus for preparing a material for high pressure deliquification |
| AUPO841997A0 (en) * | 1997-08-06 | 1997-08-28 | Day, Paul Hedley | Folding belt filter |
| US20080041245A1 (en) * | 2004-07-07 | 2008-02-21 | Peter Judocus | Solids Removal Press, Method and Feed System |
| WO2014084322A1 (en) | 2012-11-29 | 2014-06-05 | メタウォーター株式会社 | Sludge dehydration system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4039450A (en) * | 1976-04-08 | 1977-08-02 | Brown Judson G | Continuous tubular filter and method of using the same |
-
1982
- 1982-04-02 FI FI821147A patent/FI65378C/en not_active IP Right Cessation
-
1983
- 1983-03-31 DE DE19833311869 patent/DE3311869A1/en not_active Ceased
- 1983-04-02 JP JP58058562A patent/JPS6035240B2/en not_active Expired
- 1983-04-05 CA CA000425204A patent/CA1217675A/en not_active Expired
- 1983-04-05 GB GB08309158A patent/GB2117659B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| GB2117659B (en) | 1985-07-17 |
| GB2117659A (en) | 1983-10-19 |
| JPS6035240B2 (en) | 1985-08-13 |
| JPS591096A (en) | 1984-01-06 |
| FI821147L (en) | 1983-10-03 |
| FI65378B (en) | 1984-01-31 |
| DE3311869A1 (en) | 1983-10-06 |
| FI821147A0 (en) | 1982-04-02 |
| FI65378C (en) | 1984-05-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |