JP5627397B2 - Filter press dehydrator - Google Patents

Description

  The present invention provides a plurality of filter plates that are supported between a front frame and a rear frame so as to be movable between a pressure contact state and a separated state, and an endless shape that is supported so that the filter surfaces face each other between the filter plates. The present invention relates to a filter press dewatering device including a filter cloth, a driving roller for running the filter cloth in a separated state, and a cleaning mechanism for cleaning the filter cloth.

  Conventionally, various sludge treatment processes such as dewatering sludge generated at water purification plants and sewage treatment plants and separating it into filtrate and cake, or solid-liquid separation processes required in the production process of carbon products, titanium products, etc. Filter press dehydrators are used in the field for solid-liquid separation.

  FIG. 6 shows a conventional filter cloth traveling type filter press dewatering device 80 disclosed in Patent Document 1. In the filter press dewatering device 80, a plurality of filter plates 84 are disposed on a side frame 83 installed between a front frame 81 and a rear frame 82 so as to be slidable between a pressure contact state and a separation state. With the advance operation of the hydraulic cylinder 86 installed in the hydraulic cylinder 86, each filter plate 84 shifts to a pressure contact state pressed in the direction of the rear frame 82 via the pressing member 85 connected to the hydraulic cylinder 86, As the hydraulic cylinder 86 is retracted, the filter plates 84 are configured to shift to a separated state in which they are separated from each other.

  An endless filter cloth supported so that the filter surfaces are opposed to each other by the support mechanism 87 is arranged between the filter plates 84, and the filtration becomes a space partitioned by the filter cloths 88 sandwiched between the filter plates 84 in a pressure contact state. When the slurry that is the object to be treated is press-fitted into the chamber, or by expanding the diaphragm provided in the filter plate 84 in that state, the slurry is solid-liquid separated, and when each filter plate 84 shifts to a separated state, The dehydrated cake peels and falls from the filter cloth 88.

  An upper frame 89 is installed between the front frame 81 and the rear frame 82 and above each filter plate 84, and an endless filter cloth 88 that forms each filtration chamber is driven on the upper frame 89. A roller 90, a cleaning mechanism 91 for cleaning the filter cloth 88 wound up by the driving roller 90, a tension mechanism 92 for applying a predetermined tension to the filtered filter cloth 88, and a travel position in the width direction of the strained filter cloth 88. A meandering correction mechanism 93 for regulating is installed so that the meandering-corrected filter cloth 88 circulates again toward the filter plate 84.

  When each filter plate 84 shifts to the separated state, it is wound up by a predetermined distance by the driving roller 90, and then further shifts to the pressure contact state, and the solid-liquid separation of the slurry is repeated. The cleaning mechanism 91 includes a nozzle that sprays cleaning water onto the rolled up filter cloth 88, a cleaning tank that receives and drains the cleaning water supplied from the nozzle, and a cleaning water that does not scatter from the cleaning tank to the outside. A lid for covering the tank is provided.

Japanese Patent Laid-Open No. 5-15710

  However, in the above-described filter press dewatering device, when the filter cloth is rolled up by the driving roller, residues such as dewatering cake remaining on the surface of the filter cloth adhere to and accumulate on the driving roller, and follow the width direction of the driving roller. There is a possibility that the conveying force acting on the taro cloth may fluctuate. For example, the conveyance amount increases in the region where the residue adheres and accumulates on the drive roller, and the conveyance amount fluctuates along the width direction, or conversely, the filter cloth slips in the region where the residue adheres and accumulates, and the width direction The conveyance amount fluctuates along the line.

  When such a fluctuation in the conveying force occurs when the filter cloth is wound by the driving roller that applies the maximum tension, the filter cloth is likely to meander or wrinkle greatly, and the meandering correction mechanism will run the filter cloth in the width direction. In addition to being unable to properly regulate the position, there is a problem that the life of the filter cloth is shortened, and in the unlikely event that the running position of the filter cloth in the width direction cannot be properly regulated by the meandering correction mechanism, There was also a problem that an object to be treated leaked from the filtration chamber, and a problem that a non-uniform tension acts on the filter cloth over a long period of time, resulting in a shortened life and damage.

  An object of the present invention is to provide a filter press dewatering apparatus that can avoid problems such as wrinkles and meandering of filter cloth due to residues adhering to the filter cloth and can be operated stably for a long period of time.

In order to achieve the above-mentioned object, the filter press dewatering device according to the present invention is characterized in that a pressure contact state and a separation state are provided between a front frame and a rear frame as described in claim 1 of the claims. A filtration mechanism having a plurality of filter plates supported so as to be movable between, and an endless filter cloth that is supported so that the filter surfaces are opposed to each other between the filter plates and in which the filtration chamber is formed in the pressure contact state ; in the separated state, the driving roller for filter cloth is traveling, the filter cloth and cleaning mechanism for cleaning the said filter cloth to a predetermined filter press dewatering that and a tensioning mechanism for imparting tension during conveyance an apparatus, along the running direction before Symbol filter cloth, wherein the cleaning mechanism is disposed on the downstream side of the filtration mechanism, the driving roller is disposed downstream of the cleaning mechanism, downstream of said drive roller Before the upstream side of the filtration mechanism It lies in the fact that tensioning mechanism is installed.

According to the above configuration, after being filtered in the filtration chamber formed in the pressure contact state, the filter cloth wound up by the drive roller in the separated state of each filter plate is first supplied to the cleaning mechanism and cleaned, After the adhered residue is removed, it is conveyed by the drive roller. Therefore, when a large tension is applied to the filter cloth by the driving roller, the dewatered cake residue does not adhere to the driving roller. Can be avoided in advance. And the tension of the filter cloth is adjusted to an appropriate value by the tension mechanism on the downstream side of the drive roller where the tension on the filter cloth becomes small, so that the filter cloth is stable toward the filtration mechanism installed on the downstream side. Then it will be transported. In the conventional filter press dewatering apparatus shown in FIG. 6, in order to apply a stable tension to the filter cloth, a tension mechanism must be installed on the downstream side of the cleaning mechanism, and installed on the downstream side of the drive roller. It was difficult to apply a stable tension to the filter cloth before and after the driving roller due to the effect of the filter cloth slightly extending by the cleaning mechanism.

  As described in claim 2, the second characteristic configuration includes the guide roller for feeding out the filter cloth in addition to the first characteristic configuration described above, and the cleaning mechanism is cleaned by the cleaning mechanism. A filter cloth is provided between the guide roller and the driving roller so as to cover the upper space of the cleaning mechanism.

  A filter cloth is placed between the guide roller that feeds the cleaned filter cloth from the cleaning mechanism and the drive roller, and a guide roller is installed so that the filter cloth fed by the guide roller from the cleaning mechanism covers the upper space of the cleaning mechanism. Therefore, even if the cleaning water scatters upward from the cleaning mechanism, scattering of the cleaning water is prevented by the filter cloth covering the upper space. Therefore, it is not necessary to provide a separate lid or the like, and the number of parts constituting the cleaning function can be reduced.

  Further, since dust or the like falling on the cleaning mechanism is received by the filter cloth, it is not necessary to provide a separate exterior cover body.

  In the third feature configuration, as described in claim 3, in addition to the first or second feature configuration described above, any one of the front frame and the rear frame is attached to the pressure contact state or the separation state. An advancing / retreating mechanism for moving the filter plate to a state and the driving roller are installed, and the cleaning mechanism is installed on the other frame that receives the filter plate in the pressure contact state, and the filter cleaned by the cleaning mechanism The cloth is stretched between the cleaning mechanism and the driving roller so as to cover the upper space of the filter plate.

  A plurality of filter plates are pressed against each other by an advancing / retracting mechanism installed on either the front frame or the rear frame, and are separated by a driving roller installed on the same frame as the advancing / retreating mechanism. An endless filter cloth is fed out from the plate. After the filter cloth fed out from each filter plate is washed by the cleaning mechanism installed on the other frame, it is passed over the drive roller so as to cover the upper space of the filter plate, so the upper space of each filter plate There is no need to provide any support frame. Accordingly, as long as the filter cloth is removed, the apparatus can be maintained very easily by pulling the filter plate up above the filter plate without any obstacles.

  Further, since the dust falling from the upper space of the filter press device is received by the filter cloth stretched between the cleaning mechanism and the drive roller, it is not necessary to provide a separate exterior cover body.

  In the conventional filter press dewatering apparatus shown in FIG. 6, a driving roller 90 and a cleaning mechanism are mounted on an upper frame 89 that is installed between the front frame 81 and the rear frame 82 and above each filter plate 84. 91, the tension mechanism 92, etc. were installed, so that the filter plate was pulled up to the upper space of the filter plate, and not only was it very complicated to remove them, but also according to the number of installed filter plates 84 There is a complication that an upper frame 89 having a long length must be prepared.

In the fourth feature configuration, in addition to any one of the first to third feature configurations described above, the cleaning mechanism and the drive are driven along the traveling direction of the filter cloth. A meandering correction mechanism that restricts the travel direction of the filter cloth in the width direction is installed between the rollers.

According to the above-described configuration, the filter cloth after being cleaned by the cleaning mechanism can be corrected in a meandering state with the tension being appropriately maintained by the meander correcting mechanism. ing as is conveyed toward the downstream side in a stable posture by.

  As described above, according to the present invention, it is possible to provide a filter press dewatering device that can avoid problems such as wrinkles and meandering of filter cloth due to residues adhering to the filter cloth and can be operated stably for a long time. It became so.

Schematic of filter press dewatering device according to the present invention Illustration of filtration device Explanation of meandering correction mechanism Illustration of filter plate removal work Explanatory drawing which shows another embodiment Illustration of a conventional filter press dewatering device

  The filter cloth dewatering device of the filter cloth traveling type according to the present invention will be described below.

  As shown in FIG. 1, the filter press dewatering device 10 includes a front frame 11, a rear frame 12, and a pair of side frames 13 that are installed between the front frame 11 and the rear frame 12.

  A plurality of filter plates 21 are slidably supported by the pair of side frames 13, and each filter plate 21 is driven movably between a pressure contact state and a separated state by an advancing / retreating mechanism 30 installed on the front frame 11. .

  A driving roller 41 for feeding the endless filter cloth 14 is disposed on the upper part of the front frame 11, and a cleaning mechanism 50 for cleaning the filter cloth 14 is disposed on the upper part of the rear frame 12.

  The filter cloth 14 fed out by the drive roller 41 is adjusted to a predetermined tension by a tension mechanism 70 similarly installed in the front frame 11, and then the filter surface is opposed by the support mechanisms 23 installed above and below each filter plate 21. Are arranged so as to be guided to the cleaning mechanism 50 after being fed out from each filter plate 21.

  A pair of upper and lower engagement pins project from the front and rear sides of each filter plate 21, and the engagement pins of the adjacent pair of filter plates 21 engage with the long holes formed in the coupling fitting. They are connected by a link mechanism 15. In FIG. 1, the left end filter plate 21 is connected to the rear frame 12, and the right end filter plate 21 is connected to the advance / retreat mechanism 30.

  The advance / retreat mechanism 30 includes a hydraulic cylinder 33 provided with a pressing member 32 at the tip of a rod 31. When the rod 31 is moved forward by the hydraulic cylinder 33, each filter plate 21 shifts to a pressure contact state pressed toward the rear frame 12 via the pressing member 32, and when the rod 31 is retracted, the front frame 11 is moved. Each of the filter plates 21 moves toward it, and shifts to a separated state separated by a distance defined by a long hole formed in the connection fitting.

  As shown in FIG. 2, in this embodiment, each filter plate 21 has a diaphragm 22 attached to one surface along the arrangement direction, and is separated from the back surface of the filter plate 21 adjacent to the diaphragm 22. A filter chamber is formed in the space formed.

  The support mechanism 23 includes an upper roller 23a and a lower roller 23b supported by brackets fixed to the filter plates 21, and the filter cloth 14 is stretched vertically between the adjacent filter plates 21 by both rollers 23a and 23b. ing.

  In the vicinity of the upper roller 23a, a guide roller 23c for guiding the filter cloth 13 so as not to contact the filter plate 21 and the diaphragm 22 when the filter plate 21 is separated is provided.

  When the filter plate 21 shifts to the pressure contact state by the advance / retreat mechanism 30, the space partitioned by the filter cloth 14 in the filter chamber becomes the filtration chamber.

  A base is provided in a through-hole formed through each filter plate 21 in the thickness direction, and the through-holes of each filter plate 21 communicate with each other in the press contact state. And a processing target object is supplied to the said through-hole from the supply port with which the back flame | frame 12 was equipped in the press-contact state, and each filtering chamber is filled with the processing target object through the branch path formed in the nozzle | cap | die.

  In the present embodiment, pressurized water is supplied from a pressurized water flow path 24 provided below each filter plate 21 and the diaphragm 22 attached to the filter plate 21 is inflated toward the filter chamber, whereby the object to be treated is compressed. Is done.

  Returning to FIG. 1, the filter press dewatering device 10 described above is filled with a processing object in each filtration chamber in a pressure contact state in which the advance / retreat mechanism 30 is advanced.

  Then, in the separated state in which the advancing / retreating mechanism 30 is retracted after the dehydrating process, a driving process for causing the filter cloth 14 to travel a predetermined distance is performed by the drive roller 41 in order to separate the dehydrated cake from the filter cloth 14, and then the advance / retreat is performed. The mechanism 30 is advanced to repeat the same process. The drive roller 41 is drivingly connected to a drive motor via a speed reduction mechanism, and the drive mechanism 40 is configured by the drive roller 41, the speed reduction mechanism, and the drive motor.

The filter cloth 14 fed out from the final stage filtration device 20 is washed by the washing mechanism 50 provided in the rear frame 12, and then passed over the drive roller 41 via the meandering correction mechanism 60.

In other words, the drive roller 41 is installed on the downstream side of the cleaning mechanism 40 along the traveling direction along the travel path of the filter cloth 14, and the filter cloth 14 is cleaned in advance by the cleaning mechanism 40. When the cake residue does not adhere and a large tension is applied to the filter cloth 14 by the conveyance by the driving roller 41, the occurrence of an inconvenient situation such as large meandering due to adhesion and accumulation of the residue and occurrence of wrinkles occurs. It will be possible to avoid it.

The cleaning mechanism 50 includes a cleaning tank 53 that receives the cleaning water, a guide roller 51 that U-turns the filter cloth 14 that is fed from the final stage filtration device 20 and guides the filter cloth 14 in the cleaning tank 53. A guide roller 54 that folds back, a nozzle 52 that sprays cleaning water onto both surfaces of the folded filter cloth 14, and a guide roller 55 that feeds the cleaned filter cloth 14 from the cleaning tank 53 are provided.

  The guide roller 55 is disposed at the upper left end of the cleaning tank 53, and the cleaned filter cloth 14 is stretched between the guide roller 55 and the drive roller 41.

  That is, the filter cloth 14 cleaned by the cleaning mechanism 50 is stretched between the guide roller 55 and the drive roller 41 so as to cover the upper space of the cleaning mechanism 50, particularly the cleaning tank 53. Even in the case where the cleaning water is scattered in the upper space, the filter cloth 14 covering the upper space prevents the cleaning water from being scattered. Therefore, a separate lid for suppressing the cleaning water from being scattered from the cleaning mechanism 50. There is no need to provide a body or the like, and the number of parts constituting the cleaning function can be reduced.

  In this manner, the endless filter cloth 14 is circulated, and the filter cloth can be cleaned by the cleaning mechanism 50 disposed at one place of the travel path of the filter cloth to eliminate clogging. It is not necessary to employ a large-scale configuration including a cleaning mechanism, and the scattering of cleaning water is small, and the filter cloth 14 can be cleaned with a small amount of cleaning water with a simple cleaning mechanism.

  Further, since the filter cloth 14 cleaned by the cleaning mechanism 50 is stretched between the cleaning mechanism 50 and the drive roller 41 so as to cover the upper space of the filter plate 21, as long as the filter cloth 14 is removed, The filter plate 21 can be pulled up to the space above the filter plate 21 without any obstacles, and the maintenance work of the apparatus becomes extremely easy.

  Moreover, since the dust etc. which fall from the upper space of the filter press apparatus 10 are received by the filter cloth 14 spanned between the washing | cleaning mechanism 50 and the drive roller 41, it is not necessary to provide a separate exterior cover body.

  The meandering correction mechanism 60 provided between the cleaning mechanism 50 and the drive roller 41 is a mechanism that regulates the traveling position of the filter cloth 14 in the width direction, and is installed on a support frame attached to the upper part of the front frame 11. .

  As shown in FIG. 3, the meander correction mechanism 60 includes a pair of meander correction rollers 61, a support portion 62 that supports both ends of the pair of meander correction rollers 61, and air that displaces the support portion 62 along the guide rail 63. A cylinder 64, a sensor for detecting the amount of meandering in the width direction of the filter cloth 14, and a control unit for controlling the amount of air supplied to the air cylinder 64 based on the amount of meandering detected by the sensor. The control unit controls the air cylinder 64 based on the amount of meandering, and adjusts the position in the width direction of the filter cloth 14 by moving the meandering correction roller 61 along its axial direction.

  The filter cloth 14 that has been cleaned by the cleaning mechanism 50 is corrected in a meandering state with sufficient tension maintained by the meandering correction mechanism 60 and corrected to an appropriate transport posture, and then stabilized by the drive roller 41. Then, it is conveyed toward the downstream side.

  Returning to FIG. 1 again, the tension mechanism 70 will be described. The tension mechanism 70 includes a plurality of fixed rollers 71 fixed to the front frame 11, a plurality of moving rollers 72 that approach and move away from the fixed roller 71, and a moving mechanism that moves the moving rollers 72 with tension. I have. In this embodiment, the combination of the moving roller 72 and the fixed roller 71 is three steps, but an appropriate number of steps may be provided according to the length of the filter cloth, and the distance between the fixed roller 71 and the moving roller 72 is What is necessary is just to set suitably.

  As the moving roller 72 approaches and separates from the fixed roller 71, a predetermined tension is applied to the filter cloth 14. The predetermined tension refers to a tension that allows the drive roller 41 and the filter cloth 14 to run stably without slipping.

  In order for the filter cloth 14 to be stably conveyed by the drive roller 41, it is necessary that a sufficient tension is applied before and after the drive roller 41. According to the above configuration, the tension on the filter cloth 14 is not increased. Since the tension of the filter cloth is adjusted to an appropriate value by the tension mechanism 70 on the downstream side of the driving roller 41 which becomes smaller, the filter cloth 14 is stably driven by the driving roller 41 and is installed on the downstream side thereof. It will be conveyed toward 21.

  In the conventional filter press dewatering device shown in FIG. 6, since the tension mechanism 92 is provided immediately after the cleaning mechanism 91, the filter cloth 88 slightly expands including the cleaning water, and therefore the tension applied by the tension mechanism 92. May become unstable.

  On the other hand, in the filter press dewatering device 10 according to the present invention, a sufficient traveling distance of the filter cloth 14 can be ensured from the cleaning mechanism 50 provided in the rear frame 12 to the tension mechanism 70 provided in the front frame 11. In the meantime, the moisture content of the filter cloth 14 is reduced, so that the transient stretch state can be eliminated, and the tension mechanism 70 can apply a stable tension.

  Further, in the conventional filter press dewatering device 80 shown in FIG. 6, the upper frame 89 that supports the drive roller 90, the cleaning mechanism 91, the tension mechanism 92, the meandering correction mechanism 93, and the like is provided between the front frame 81 and the rear frame 82. Therefore, when it is necessary to remove the filter plate 84 from the filter press dewatering device 80 for maintenance or the like, it is necessary to remove the upper frame 89 and open the upper space of each filter plate 84. However, it was very cumbersome and time-consuming.

However, since the filter press dewatering device 10 according to the present invention does not have such an obstacle in the upper space of the filtration device 20, if the filter cloth 14 is removed, the filtration device 20 can be easily detached upward and maintenance work can be performed. It became possible to do it efficiently.

FIG. 4 shows a state in which the filtering device 20 is detached upward after the filter cloth 14 is removed.

  Hereinafter, another embodiment of the filter press dewatering device according to the present invention will be described.

  As shown in FIG. 5, the cleaning mechanism 50 guides the filter cloth 14 into the cleaning mechanism 50 by the guide roller 51, and then cleans the filter cloth 14 by the nozzle 52 that sprays cleaning water on one or both surfaces of the filter cloth 14. Then, the filter cloth 14 may be fed out from the cleaning tank 53 by the guide roller 55 after passing through the guide roller 54 that turns the filter cloth 14 back in the cleaning tank 53.

  Further, the installation position of the meandering correction mechanism 60 does not have to be a substantially central position between the cleaning mechanism 50 and the drive roller 41 as shown in FIG. 1, but is located immediately upstream of the drive roller 51 as shown in FIG. 5. You may install in. In this case, since the upper space of the filtration device 20 can be widened, the separation of the filtration device 20 is facilitated by maintenance work.

  In the above-described embodiment, the configuration in which the front frame 11 includes the driving roller 41, the advance / retreat mechanism 30, the meandering correction mechanism 60, and the tension mechanism 70 and the rear frame 12 includes the cleaning mechanism 50 has been described. 11 may include a cleaning mechanism 50, and the rear frame 12 may include a driving roller 41, an advance / retreat mechanism 30, a meandering correction mechanism 60, and a tension mechanism 70.

  In any case, a cleaning mechanism 50 having a nozzle 52 for spraying cleaning water onto the filter cloth 14, a driving roller 41 for running the filter cloth 14 in a separated state of the filter plates 21, and applying a predetermined tension to the filter cloth It is only necessary that the tensioning mechanism 70 is provided along the travel path of the filter cloth 14 in this order.

  In other words, a driving roller is installed in one of the front frame and the rear frame, and a cleaning mechanism is installed in the other frame that receives the filter plate in the pressure contact state. The filter cloth cleaned by the cleaning mechanism is attached to the filter plate. What is necessary is just to be spanned between a washing | cleaning mechanism and a drive roller so that upper space may be covered.

  The mechanism for moving the filter plate 14 between the pressure contact state and the separation state is not limited to the one configured by the advance / retreat mechanism 30 including the hydraulic cylinder described above, but between the sprockets provided in the front frame 11 and the rear frame 12. Each filter plate 14 is suspended on the arranged chain, and the sprocket is driven to move the chain so that each filter plate 14 suspended on the chain is moved between the pressure contact state and the separated state. There may be.

  Each of the above-described embodiments is an example of the present invention, and the present invention is not limited by the description. The specific configuration of each part can be appropriately changed and designed within the range where the effects of the present invention are exhibited. Needless to say.

10: Filter press dewatering device 11: Front frame 12: Rear frame 13: Side frame 14: Filter cloth 15: Link mechanism 20: Filtration device 21: Filter plate 22: Diaphragm 23: Support mechanism 23a: Upper roller 23b: Lower roller 23c : Guide roller 24: pressurized water flow path 30: advance / retreat mechanism 31: rod 32: pressing member 33: hydraulic cylinder 40: drive mechanism 41: drive roller 50: cleaning mechanism 51: guide roller 52: nozzle 53: cleaning tank 54: guide roller 55: Guide roller 60: Meandering correction mechanism 61: Meandering correction roller 62: Supporting part 63: Guide rail 64: Air cylinder 70: Tensioning mechanism 71: Fixed roller 72: Moving roller

Claims (4)

A plurality of filter plates supported between a front frame and a rear frame so as to be movable between a pressure contact state and a separation state, and a filter chamber is supported in the pressure contact state so that the filter surfaces are opposed to each other between the filter plates. A filtration mechanism having an endless filter cloth formed ;
A driving roller for running the filter cloth in the separated state;
A cleaning mechanism for cleaning the filter cloth;
A tension mechanism that applies a predetermined tension to the filter cloth being conveyed;
A filter press dewatering device comprising:
Along the running direction before Symbol filter cloth, wherein the cleaning mechanism is disposed on the downstream side of the filtration mechanism, the driving roller is disposed downstream of the cleaning mechanism, the filter a downstream side of said drive roller A filter press dewatering device in which the tension mechanism is installed on the upstream side of the mechanism .   The cleaning mechanism includes a guide roller for feeding out the filter cloth, and the filter cloth cleaned by the cleaning mechanism spans between the guide roller and the driving roller so as to cover an upper space of the cleaning mechanism. The filter press dewatering device according to claim 1. One of the front frame and the rear frame is provided with an advancing / retreating mechanism for moving the filter plate in the pressure contact state or the separated state, and the drive roller, and the other receiving the filter plate in the pressure contact state The cleaning mechanism is installed in the frame of
The filter press dewatering device according to claim 1 or 2, wherein the filter cloth cleaned by the cleaning mechanism is stretched between the cleaning mechanism and the drive roller so as to cover an upper space of the filter plate. The meandering correction mechanism which regulates the width direction traveling position of the said filter cloth is installed between the said washing | cleaning mechanism and the said drive roller along the traveling direction of the said filter cloth. The filter press dewatering device described.

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