JP5770599B2 - Belt press dehydrator - Google Patents

Description

  The present invention relates to a belt press dewatering device for performing a dewatering process on an object to be processed such as sludge using a filter cloth belt.

  2. Description of the Related Art Conventionally, a belt press dewatering device that dehydrates pressure between endless filter cloth belts that circulate sludge such as sewage or factory wastewater that is a processing target and reduces the water content has been used.

  With regard to such a belt press dewatering device, Patent Document 1 discloses that in order to improve the dewatering performance, a primary dewatering unit that pressurizes and dewaters sludge between filter cloth belts, and a dewatering process is performed in the primary dewatering unit. And a secondary dewatering unit for further dewatering the sludge using a filter cloth belt and a pressure roller. Between these primary dewatering unit and secondary dewatering unit, iron-based dewatering assistant (iron-based agglomeration) is added to the sludge. The structure provided with the mixer which mixes (agent) is disclosed.

JP 61-42312 A

  By the way, in the above-described conventional technology, the mixer provided between the primary dewatering unit and the secondary dewatering unit introduces the plate-like and wide sludge discharged from between the filter cloth belts of the primary dewatering unit as it is. The sludge is stirred using a paddle type horizontal axis stirrer in the wide container. That is, since this mixer is stirred by the horizontal axis stirrer while the sludge is spread in the width direction, the stirring efficiency is very poor and it is difficult to sufficiently mix the flocculant. In addition, since the mixer has a wide container shape, it is difficult to uniformly add the inorganic flocculant over the entire sludge, and the apparatus configuration is complicated.

  The present invention has been made in consideration of the above-described conventional problems, and the dewatering performance is improved by sufficiently stirring the object to be dehydrated in the primary dehydration unit and then throwing it into the secondary dehydration unit. An object of the present invention is to provide a belt press dewatering device that can be improved.

The belt press dewatering apparatus according to the present invention further includes a primary dewatering unit that dehydrates a processing object using a filter cloth belt, and a processing object that has been dewatered by the primary dewatering unit using the filter cloth belt. Provided between the secondary dewatering part to be dewatered and the primary dewatering part and the secondary dewatering part with a width smaller than the filter cloth belt of the primary dewatering part, and dewatering treatment in the primary dewatering part After stirring the treated object, a stirring tank that is carried out to the secondary dewatering unit, and an outlet of the primary dewatering unit and an inlet of the stirring tank are connected, and the outlet of the primary dewatering unit The inlet side of the stirring tank is set to be narrower than the side, so that the processing object to be carried out from the primary dewatering unit is gathered in the width direction while being thrown into the stirring tank, and wherein the the stirring tank, the inlet and is formed open at a position separated, inside the treated versus Can be added chemicals addition port of coagulant things characterized that you have provided only one.

  According to such a configuration, the width dimension of the stirring tank is configured to be smaller than the width dimension of the filter cloth belt of the primary dewatering section, and further, the primary dewatering section is provided between the primary dewatering section and the stirring tank. The agitation tank is connected to the inlet side of the agitation tank that is narrower than the outlet side of the agitation so that the processing object such as sludge dehydrated in the primary dehydration unit is agglomerated and condensed. Since it can be consolidated, the stirring efficiency is improved and the residence time in the stirring tank is also increased. In other words, the processing object thrown from the primary dehydration unit to the secondary dehydration unit is sufficiently agitated and compacted in the agitation tank and degassed, so that the dehydration efficiency in the subsequent secondary dehydration unit is improved. And the moisture content of the dewatering cake which is a process target object after a dehydration process can be reduced. Moreover, the secondary dehydration is performed with the thickness (height) increased by passing the object to be processed in the width direction on the filter cloth belt of the primary dehydration section through a narrow stirring tank. The dewatering efficiency in the secondary dewatering unit can be further improved.

When one chemical addition port for adding a flocculant to the processing object inside is provided in the stirring tank, coupled with high stirring efficiency in the stirring tank, the mixing ratio of the processing object and the flocculant is greatly increased. Since it can raise, the dehydration performance in a secondary dehydration part can be improved further.

  When the width dimension of the outlet of the agitation tank is smaller than the width dimension of the filter cloth belt of the secondary dewatering part, the height of the processing object put into the secondary dewatering part from the agitation tank is further increased. The dehydration efficiency can be further improved.

  When the outlet of the stirring tank is connected to the inlet of the secondary dewatering section, and the outlet side of the secondary dewatering section is provided wider than the outlet side of the stirring tank, Since the processing object carried out from the outlet can be introduced into the secondary dewatering unit while appropriately diffusing in the width direction, higher dewatering efficiency can be obtained in the secondary dewatering unit.

  The unloading path may be provided with a dispersion member that disperses the processing object unloaded from the stirring tank in the width direction. If it does so, the processing object flowed on the carrying-out path from the stirring tank can be spread and distributed to both sides while maintaining a sufficient height, and the width of the filter cloth belt in the secondary dewatering section Dehydration using the dimensions more effectively becomes possible, and the dehydration efficiency can be further increased.

  The collective path and the carry-out path may be installed at positions that overlap each other in plan view. As a result, the primary dewatering unit and the secondary dewatering unit can be concentrated and arranged in the conveyance direction of the object to be processed, so that the belt press dewatering device is elongated in the conveyance direction and the installation space is increased. This can be avoided and a compact equipment configuration can be realized.

  According to the present invention, the width dimension of the stirring tank is configured to be smaller than the width dimension of the filter cloth belt of the primary dewatering section, and the outlet of the primary dewatering section is further provided between the primary dewatering section and the stirring tank. The inlet side of the stirring tank is connected by a collecting path set narrower than the side. As a result, it is possible to agitate / consolidate the processing object such as sludge that has been dehydrated in the primary dehydration unit in a state of being concentrated and condensed, so that the dehydration efficiency in the secondary dehydration unit in the subsequent stage is improved and dewatering is performed. The water content of the dehydrated cake that is the object to be treated after the treatment can be reduced.

FIG. 1 is an overall configuration diagram of a belt press dewatering apparatus according to an embodiment of the present invention. FIG. 2 is a cross-sectional view taken along the line II-II in FIG. FIG. 3 is a perspective explanatory view schematically showing the state of the processing object put into the stirring tank from the primary dehydration unit and the processing object carried out from the stirring tank to the secondary dehydration unit. FIG. 4 is an overall configuration diagram of a belt press dewatering apparatus according to a modification.

  Hereinafter, preferred embodiments of a belt press dewatering apparatus according to the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is an overall configuration diagram of a belt press dewatering apparatus 10 according to an embodiment of the present invention, and is a side view partially showing a cross section. A belt press dehydrating apparatus 10 (hereinafter also simply referred to as “dehydrating apparatus 10”) according to this embodiment is configured to process a processing object such as sewage sludge into a primary dehydrating unit 12 and a secondary dehydrating unit 14 using a filter cloth belt. It is a device that dehydrates while being conveyed in order and discharges it as a dehydrated cake, and may of course be used not only as a dehydrator but also as a concentrator.

  As illustrated in FIG. 1, the dehydrating apparatus 10 includes a first dehydrating unit 12 that gravity dehydrates a processing object using a filter cloth belt (upper filter cloth belt) 16, and a process that is dehydrated by the first dehydrating unit 12. An agitation tank 18 for agitating the object, and a second dehydration unit 14 for pressure-dehydrating the treatment object discharged from the agitation tank 18 between the filter cloth belt 16 and the filter cloth belt (lower filter cloth belt) 20 are provided. .

  The first dewatering unit 12 includes an endless filter cloth belt 16 that is wound around a plurality of rollers 22a to 22f and driven to rotate in one direction, and moves toward the moving direction of the filter cloth belt 16 (arrow A direction). The filter cloth belt 16 stretched between the rollers 22a and 22e inclined upward constitutes the gravity dewatering portion 12a.

  The filter cloth belt 16 is a long belt-like filter cloth having water permeability, and is wound around each of the rollers 22a to 22f with sufficient tension. An arrow in FIG. It can move in direction A.

  The gravity dewatering unit 12a filters the water contained in the processing object by gravity by placing the processing object on the outer peripheral surface (surface) of the filter cloth belt 16 stretched between the upper rollers 22a and 22e. It is a means to separate.

  In the first dewatering unit 12, the object to be processed put on the filter cloth belt 16 on the upstream side (roller 22e side) of the gravity dewatering unit 12a is conveyed to the downstream side (roller 22a side) by the filter cloth belt 16. Meanwhile, only moisture passes through the filter cloth belt 16 by gravity and is filtered and dehydrated. The filtered water (separated liquid, filtrate) permeates and falls to the inner peripheral surface side (back surface side) of the filter cloth belt 16 and is then collected by the filtrate receiving tray 24.

  The second dewatering unit 14 includes an endless filter cloth belt 20 wound around a plurality of rollers 22f to 22i and driven to rotate in one direction, and the filter cloth belt 16, and the filter cloth belt 16 and the filter cloth belt. The portion where the outer peripheral surfaces (surfaces) 20 and 20 are in contact with (or close to each other) constitutes a pressure dewatering unit (press unit) 14a. 1 shows a slightly exaggerated gap between the outer peripheral surfaces of the filter cloth belt 16 and the filter cloth belt 20 for easy understanding, but in actuality, the outer peripheral surfaces of the filter cloth belt 16 and the filter cloth belt 20 are illustrated. The space is in contact with or close to each other, and the same applies to FIG.

  Like the filter cloth belt 16, the filter cloth belt 20 is a long belt-like filter cloth having water permeability, wound around the rollers 22f to 22i with sufficient tension, and a drive source such as a motor (not shown). Thus, it can be moved in the direction of arrow B in FIG.

  The pressure dewatering unit 14a is disposed so that the outer peripheral surface of the filter cloth belt 16 stretched between the rollers 22b, 22c, 22f, and 22d and the outer peripheral surface of the filter cloth belt 20 stretched between the rollers 22i, 22f, and 22g are in contact with each other. In this state, the filter cloth belt 16 and the filter cloth belt 20 are moved in the same direction (directions of arrows A and B), and the object to be treated is sandwiched and pressed between the outer peripheral surfaces of the filter cloth belts 16 and 20. And means for filtering and separating water contained in the object to be treated.

  In the second dewatering unit 14, the processing object discharged from the stirring tank 18 and put on the filter cloth belt 20 on the upstream side (roller 22 i side) of the pressure dewatering unit 14 a is conveyed by the filter cloth belt 20. After that, only moisture is drawn from the vicinity of the roller 22b to the downstream side in a state of being drawn and sandwiched / pressed between the filter cloth belt 16 and the filter cloth belt 20 constituting the pressure dehydrating unit 14a. The filter cloth belt 20 is permeated through the filter cloth belt 20 by the pressure applied by the filter cloth belts 16 and 20, and is filtered and dehydrated. The filtered water permeates and falls to the inner peripheral surface side (back surface side) of the filter cloth belt 20 constituting the pressure dewatering section 14a, and the filter cloth belt 20 between the lower rollers 22g, 22h, and 22i also. After permeating and falling, it is collected by the filtrate receiving tray 26.

  FIG. 2 is a cross-sectional view taken along the line II-II in FIG.

  As shown in FIGS. 1 and 2, the agitation tank 18 includes an inlet 18 a that is formed near the primary dewatering unit 12 on the top surface, and an outlet 18 b that is formed on the side surface near the secondary dewatering unit 14. And a chemical addition port (flocculating agent charging port) 18c formed at a position spaced from the top surface inlet 18a, and a rotating plate (stirring blade) 28a of a stirrer (stirrer) 28 is disposed in the tank. Yes. A chemical charging machine (not shown) is connected to the chemical addition port 18c.

  The agitation tank 18 has an inlet 18 a connected to the outlet of the primary dewatering unit 12 (near the roller 22 a) by a collecting path 30, and an outlet 18 b connected to the inlet of the secondary dewatering part 14 (near the roller 22 i) by a carry-out path 32. It is connected.

  As shown in FIG. 2, the agitation tank 18 is a side parallel to the width direction of the filter cloth belt 16 and the filter cloth belt 20 constituting the conveyance path of the object to be processed in the first dehydrating unit 12 and the second dehydrating unit 14. The edge width W1 is set to be smaller than the width W2 in the direction orthogonal to the conveying direction of the filter cloth belt 16 and the filter cloth belt 20, and the corner tank has a sufficient depth formed in the tank. Of course, the agitation tank 18 may be other than the square tank, but the width and outer diameter thereof are set narrower than the width W2 of the two filter cloth belts 16 and 20. In the present embodiment, the filter cloth belt 16 and the filter cloth belt 20 are described as having the same width W2. However, the widths of the filter cloth belts 16 and 20 may be different.

  As shown in FIG. 1, the stirring device 28 includes a driving source 28b such as a motor, and a rotating plate 28a that rotates inside the stirring tank 18 when the rotational driving force from the driving source 28b is transmitted through the rotating shaft. It consists of. The stirring device 28 can efficiently and sufficiently stir the object to be processed put in the stirring tank 18 by rotating the rotating plate 28a at a predetermined rotation speed in the stirring tank 18 which is a square tank. it can.

  As shown in FIG. 1 and FIG. 2, the collecting path 30 is a tapered conveying path that gradually becomes narrower from the outlet side of the primary dewatering unit 12 toward the inlet 18 a side of the agitation tank 18. Side plates 30a that prevent the object from falling off are formed upright on both sides, and are inclined downward toward the downstream side (inlet 18a side).

  The collecting path 30 is set to have a narrower width on the inlet 18a side of the stirring tank 18 than on the outlet side of the primary dewatering unit 12, so that the primary dewatering unit 12 spreads in the width direction and is processed and dewatered. This is a transport path (flow path) in which objects can be gathered in the center in the width direction and densely packed, and can be put into the stirring tank 18 from the inlet 18a in this dense state. The collection path 30 allows the processing objects that have spread in the width direction in the primary dewatering unit 12 to be put into the stirring tank 18 in a state of being collected in the center. Compared with the case of stirring in a stirring tank having the same width as 20, the stirring efficiency in the stirring tank 18 can be greatly increased.

  As shown in FIGS. 1 and 2, the carry-out path 32 is a forward-conveying path that gradually widens from the outlet 18 b side of the stirring tank 18 toward the inlet side of the secondary dewatering unit 14, and is transported Side plates 32a that prevent the object from falling off are erected on both sides, and are inclined downward toward the downstream side (the inlet side of the secondary dewatering unit 14). The carry-out path 32 is configured such that the inlet side of the secondary dewatering unit 14 is set wider than the outlet 18b side of the stirring tank 18, so that the processing objects collected and sufficiently stirred in the stirring tank 18 are arranged in the width direction. It is a conveyance path (flow path) that can be introduced into the secondary dewatering unit 14 while spreading toward both sides.

  As shown in FIG. 1, the processing object stirred in the stirring tank 18 is discharged from the outlet 18 b to the carry-out path 32 by overflow. That is, in the agitation tank 18, the input amount of the processing object before stirring from the inlet 18 a and the discharge amount of the processing object after stirring from the outlet 18 b are set equal to each other. The stirred processing object is discharged by overflow from the supernatant portion to the outlet 18b in order.

  Dispersing plates (dispersing members) 38 are provided on the carry-out path 32 so as to come into contact with the processing object carried out from the outlet 18b of the agitation tank 18 and forcibly disperse the processing object to both sides in the width direction. It is done. The dispersion plate 38 is, for example, a triangular member that is widened toward the downstream side by setting a vertex on the upstream side and setting a base on the downstream side in a plan view shown in FIG. 32 is branched in two directions. Of course, the dispersion plate 38 may branch the carry-out path 32 in three or more directions.

  Next, the operation of the belt press dewatering device 10 configured as described above will be described.

  First, an object to be treated (hereinafter, sludge is explained as an example of the object to be treated) introduced to the upstream side of the gravity dewatering part 12a that constitutes the primary dewatering part 12 is conveyed on the filter cloth belt 16 by gravity. It is dehydrated (natural dehydration) and put into the collecting path 30. The sludge flowing through the collecting path 30 is collected in the center in the width direction as it goes downstream, and then is introduced into the stirring tank 18 from the inlet 18a.

  The sludge thrown into the stirring tank 18 is subjected to sufficient stirring action by the stirring device 28 to be compacted, degassed, and then continuously discharged from the outlet 18b to the carry-out path 32 by overflow. At the time of stirring, when an inorganic flocculant such as an iron-based flocculant was added through the chemical addition port 18c, it was collected in the stirring tank 18 due to high stirring efficiency and compaction action in the stirring tank 18 having a square tank shape. The sludge is thoroughly mixed with the flocculant. That is, the agitation tank 18 has a function as a sludge agitation means and a function as a consolidation means.

  Next, the sludge sufficiently stirred in the stirring tank 18 is in a state where the thickness (height H1) is increased from the outlet 18b to the carry-out path 32 in comparison with the thickness (height H1) on the outlet side of the primary dewatering unit 12. At the height H2) (see FIG. 3), and flows through the carry-out path 32 in the thickened height H2 state and is fed into the secondary dewatering unit 14. Thereby, the sludge thrown into the pressure dehydration part 14a of the secondary dehydration part 14 is pinched and pressurized between the filter cloth belts 16 and 20, and is efficiently dehydrated, and the moisture content is lowered to a desired value. After that, the dehydrated cake is discharged to the outside from the secondary dewatering unit 14.

  As described above, according to the belt press dewatering apparatus 10 according to the present embodiment, the primary dewatering unit 12 that dehydrates the processing object using the filter cloth belt 16 and the dewatering process performed by the primary dewatering unit 12. An object is provided between the secondary dewatering unit 14 for further dewatering using the filter cloth belts 16 and 20 and the width W1 smaller than the filter cloth belt 16 between the primary dewatering unit 12 and the secondary dewatering unit 14. The agitation tank 18 that is to be dehydrated in the primary dehydration unit 12 and then transported to the secondary dehydration unit 14, the outlet of the primary dehydration unit 12, and the inlet 18 a of the agitation tank 18 Are connected to each other, and the inlet 18a side of the stirring tank 18 is set narrower than the outlet side of the primary dewatering unit 12, thereby collecting the processing objects carried out from the primary dewatering unit 12 in the width direction. And a collecting path 30 that is poured into the stirring tank 18.

  Thus, the width dimension W1 of the agitation tank 18 is configured to be smaller than the width dimension W2 of the filter cloth belt 16 of the primary dewatering unit 12, and further, the space between the primary dehydration part 12 and the agitation tank 18 is The stirring area in the plan view in the stirring tank 18 is reduced by connecting the inlet 18a side of the stirring tank 18 to the narrower passage 30 than the outlet side of the secondary dehydrating section 12, thereby reducing the primary dehydrating section. Since the processing objects dehydrated in 12 can be concentrated and condensed in a condensed state, the stirring efficiency is improved, and the residence time in the stirring tank 18 is increased. That is, since the processing object thrown into the secondary dehydration unit 14 from the primary dehydration unit 12 is sufficiently agitated and compacted in the agitation tank 18 and degassed, The dewatering efficiency is improved, and the moisture content of the dewatered cake that is the object to be processed after the dewatering process can be reduced. Moreover, the thickness (height) of the processing object in the state of spreading in the width direction on the filter cloth belt 16 of the primary dewatering unit 12 is made to pass through the narrow tank-shaped stirring tank 18. It can be put into the secondary dewatering unit 14 in an increased state, and the dewatering efficiency in the secondary dewatering unit 14 can be further improved. As a result, as compared with the configuration in which the processing object dehydrated in the primary dehydration unit is stirred while being spread in the width direction as in the conventional technique, the dehydrated cake is put into the secondary dehydration unit. The water content can be greatly reduced.

  In FIG. 1, as the primary dehydration unit 12, a configuration in which the object to be processed is gravity dehydrated by the gravity dehydration unit 12 a is illustrated, but the primary dehydration unit 12 is also paired like the secondary dehydration unit 14. In order to obtain a belt press structure that sandwiches and presses the object to be processed between the filter cloth belts, for example, as shown by a two-dot chain line in FIG. 1, a filter cloth belt 42 wound around rollers 40a, 40b, and 40c is provided. May be installed. In addition to the configuration using the pair of filter cloth belts 16 and 20, the secondary dewatering unit 14 may be configured to pressurize and dehydrate the object to be processed using, for example, a roller and a filter cloth belt.

  In the agitation tank 18, the treatment object such as sludge can be agitated with such a high agitation efficiency. Therefore, when a chemical such as an inorganic flocculant is added into the agitation tank 18 from the chemical addition port 18 c, The mixing ratio with the chemical can be greatly increased, and the dewatering performance in the secondary dewatering unit 14 can be further improved. Further, since the stirring tank 18 is a narrow tank that collects and stirs the processing object from the primary dehydration unit 12, the flocculant is added only from one point of the chemical addition port 18c, and the processing object is obtained. Therefore, it is easy to control the addition amount (mixing amount) of the flocculant.

  In the stirring tank 18, the outlet 18b to which the upstream side of the carry-out path 32 is connected is set to a width W1 that is narrower than the width W2 of the filter cloth belts 16 and 20 (see FIG. 2). Therefore, as shown in FIG. 3, the processing target to be fed from the stirring tank 18 to the secondary dewatering unit 14 is higher than the height H1 of the processing object P1 to be fed from the primary dehydrating unit 12 to the stirring tank 18. The height H2 of the object P2 can be increased. In this way, when the outlet 18b is set to a width dimension narrower than the width dimension of the filter cloth belts 16 and 20, the processing object P1 that has spread in the width direction in the primary dewatering unit 12 and has become thinner is aggregated in the width direction. Then, it is discharged to the carry-out path 32 in a state where the thickness is increased, and can be put into the secondary dewatering unit 14 as the processing object P2 having a sufficient thickness (height H2). Therefore, compared with the case where the processing object P1 thinly extended in the width direction in the primary dewatering unit 12 is put into the secondary dewatering unit 14 while being thin, the dewatering efficiency in the belt press in the secondary dewatering unit 14 is significantly increased. Can do.

  Further, the outlet 18b of the stirring tank 18 and the inlet of the secondary dewatering unit 14 are connected to each other, and a carry-out path 32 in which the inlet side of the secondary dewatering unit 14 is set wider than the outlet 18b side of the stirring tank 18 is provided. Thus, the processing object carried out from the outlet 18b of the agitation tank 18 can be thrown into the secondary dewatering unit 14 while being diffused in the width direction appropriately, so that the secondary dewatering unit 14 has higher dewatering efficiency. Can be obtained.

  At this time, by providing the dispersion plate 38 on the carry-out path 32, as shown in FIGS. 2 and 3, the stirring tank 18 causes the filter cloth belt 16 and the filter cloth belt 20 to have a width W1 narrower than the width W2. After being densely packed, the object to be processed that has flowed from the outlet 18b onto the carry-out path 32 can be spread and distributed to both sides while maintaining a sufficient height H2. For this reason, it becomes possible to perform dewatering more effectively utilizing the width dimension of the two filter cloth belts 16 and 20 in the secondary dewatering unit 14, and the dewatering efficiency can be further enhanced.

  In addition, in FIG. 3, since the conveyance state of the sludge in the structure which provided the dispersion | distribution board 38 is illustrated, the state where the sludge is branched and flowed in two directions on the carrying-out path 32 is illustrated. In the case of the configuration in which the dispersion plate 38 is not provided, the sludge flows on the carry-out path 32 in a cross-sectional shape approximate to the shape of the outlet 18b, and maintains the thickness (height H2) depending on the shape of the carry-out path 32. It is slightly widened in the width direction and charged into the secondary dewatering unit 14. When the dispersion plate 38 is not installed as described above, the dispersion efficiency of the sludge filter cloth belts 16 and 20 in the width direction is lowered, but the secondary dewatering unit 14 is sufficiently increased in the thickness of the sludge. Therefore, it is possible to obtain a high dehydration efficiency.

  As shown in FIGS. 1 and 2, the collecting path 30 and the carry-out path 32 are installed at positions that overlap each other in plan view. Thus, by providing the collecting path 30 and the unloading path 32 on the same side surface side of the stirring tank 18 and arranging them in the height direction, the primary dewatering unit 12 and the secondary dewatering unit 14 are transported of the processing object. Since the dehydrating apparatus 10 can be elongated in the transport direction and the installation space can be increased, a compact equipment configuration can be realized.

  As shown in FIG. 4, the belt press dewatering device 10 conveys a processing object through a primary dewatering unit 44 and a secondary dewatering unit 46 having substantially the same configuration as the primary dewatering unit 12 and the secondary dewatering unit 14. You may comprise as the belt press dehydration apparatus 10a which installed side by side in the direction and installed the stirring tank 18 in the meantime.

  The primary dewatering unit 44 includes a filter cloth belt 50 wound between the rollers 48a and 48b, and the secondary dewatering unit 46 includes a filter cloth belt 52 wound between the rollers 48c and 48d and the rollers 48e and 48f. A filter cloth belt 54 is provided. In the case of this belt press dehydrating apparatus 10a, the apparatus becomes longer in the conveying direction of the object to be processed, but the installation space in the height direction can be reduced, and the apparatus configuration is further simplified. There is an advantage that can be. In addition, if the primary dewatering unit and the secondary dewatering unit can be driven individually, it is easy to change the filter cloth speed, and by reducing the filter cloth speed of the secondary dewatering part, the water content of the dehydrated cake is further reduced. descend.

  It should be noted that the present invention is not limited to the above-described embodiment, and it is needless to say that the present invention can be freely changed without departing from the gist of the present invention.

  For example, in the above-described embodiment, the system for dehydrating the object to be processed in two stages of the primary dehydrating unit 12 and the secondary dehydrating unit 14 is illustrated, but the system may be configured as a system for dehydrating in three or more stages. Of course. In this case, for example, the stirring tank 18 may be installed between any or all of the two-stage dewatering units.

10, 10a Belt press dewatering device 12, 44 Primary dewatering unit 14, 46 Secondary dewatering unit 16, 20, 42, 50, 52, 54 Filter cloth belt 18 Stirring tank 18a Inlet 18b Outlet 18c Chemical addition port 28 Stirring device 30 Collective path 32 Carry-out path 38

Claims (5)

A primary dewatering unit for dewatering the object to be treated using a filter cloth belt;
A secondary dehydration unit for further dehydrating the processing object dehydrated in the primary dehydration unit using a filter cloth belt;
Between the primary dehydration part and the secondary dehydration part, the processing object which was provided with a width smaller than the filter cloth belt of the primary dehydration part and dehydrated in the primary dehydration part was stirred. Then, a stirring tank carried out to the secondary dewatering unit,
By connecting between the outlet of the primary dewatering part and the inlet of the stirring tank, the inlet side of the stirring tank is set narrower than the outlet side of the primary dewatering part, so that the primary dewatering part A collecting path for charging the processing object to be carried out from the mixing tank in the width direction while collecting the processing object ,
Wherein the stirring tank, the inlet and is formed open at a position spaced, belt press can be added chemicals addition port flocculant inside of the processing object is characterized in that that provided only one dehydration apparatus. The belt press dewatering device according to claim 1 ,
A belt press dewatering apparatus, wherein a width dimension of an outlet of the stirring tank is smaller than a width dimension of a filter cloth belt of the secondary dewatering unit. The belt press dewatering device according to claim 2 ,
It connects between the exit of the said stirring tank and the inlet_port | entrance of the said secondary dehydration part, It equips with the carrying-out path where the inlet side of this secondary dehydration part was set wider than the exit side of this stirring tank, It is characterized by the above-mentioned. Belt press dehydrator. The belt press dewatering device according to claim 3 ,
A belt press dewatering device according to claim 1, wherein a dispersion member that disperses the processing object carried out of the stirring tank in a width direction is provided in the carrying-out path. The belt press dewatering device according to claim 3 or 4 ,
The belt press dehydrating apparatus, wherein the collecting path and the carry-out path are installed at positions overlapping each other in a plan view.

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