JP2001314898A - Sludge dehydration treatment apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sludge dehydration treatment apparatus capable of making the feed force of SS in the regions in the vicinity of both left and right sidewalls in the feed passage of a dehydration treatment chamber larger than that of SS in the central region to equalize the feed quantity of SS in a rotary shaft direction and capable of certainly corresponding to the dehydration and concentration of inorganic sludge or the like high in solid content. SOLUTION: Rotary filters 6a-6e, 7a-7j, wherein a large number of disks 10, 12 or 10, 11, 12 are arranged on rotary shafts 8 at a predetermined interval (forming a gap T), are arranged in a dehydration treatment chamber 2 so as to form a plurality of coupling rows and the sludge liquid 5 supplied in the dehydration treatment chamber 2 is fed while filtered and dehydrated by the rotation of the rotary filters 6a-6e, 7a-7j to be discharged as a dehydrated cake 13. The feed force of sludge in the regions Wa, Wb in the vicinity of the left and right sidewalls supporting the rotary shafts 8 of the dehydration treatment chamber 2 is made larger than that of sludge in the central regions C of the rotary shafts 8 by a means changing the arranging constitution of the disks 10, 12 or 10, 11, 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for dehydrating and condensing sludge generated from a wastewater (wastewater) treatment system or the like, and more particularly, to a method in which a large number of disks are arranged in a rotating shaft direction at predetermined intervals. The sludge liquid (stock solution) supplied to the dehydration treatment chambers in which a plurality of rotary filter bodies are arranged in an intersecting row is filtered and dewatered by the rotation of the rotary filter body, and the suspended solids in the sludge solution ( The present invention relates to an improved technology of a filter rotating type (multi-disc type) sludge dewatering apparatus for concentrating and transporting (hereinafter referred to as "SS") and discharging it as a dewatered cake outside the dewatering processing chamber.

[0002]

2. Description of the Related Art Sludge liquid (separated) generated from a wastewater (wastewater) treatment system utilizing an activated sludge method is finally subjected to vacuum dehydration, centrifugal dehydration, pressure dehydration, and roll dehydration (belt press, etc.). The resulting dewatered cake is physically dehydrated and concentrated by such a technique as described above, and the resulting dehydrated cake is subjected to carbonization treatment or the like and reused as fertilizer or the like.

[0003] As one of the sludge liquid dehydration and concentration treatment techniques, there is a known method using a "filter rotating rotary sludge dehydration treatment apparatus" disclosed in Japanese Patent Application Laid-Open No. Hei 10-137795. Hereinafter, the configuration of the filter rotating rotary sludge dewatering apparatus will be briefly described.

[0004] First, a ring-shaped disk having a predetermined thickness and diameter is provided with a gap between the disks, and a plurality of substantially rotating "rotary filter bodies" arranged on a rotating shaft are provided. A plurality of the "rotary filter bodies" are arranged in a mating line in a dehydration treatment chamber to which the sludge liquid to be treated is supplied.

[0005] More specifically, the adjacent rotary filter is
Partial regions of the outer peripheral edge of the disc are meshed with each other in a mating row that is fitted in the gap between the mating discs.
The mating rows are arranged in the upper and lower stages in the dewatering chamber so that the interval gradually decreases from the sludge supply port toward the discharge port side.

[0006] The sludge liquid supplied from the sludge supply port into the dehydration treatment chamber moves toward the discharge port in the area between the upper and lower mating rows by simultaneously rotating the rotary filters. .

In the course of this movement, the sludge flowing into the gap formed between the discs whose outer peripheral surfaces face each other is compressed, the water is filtered off (dewatered), and gradually concentrated. You. Then, a so-called “dehydrated cake” composed of concentrated suspended solids (hereinafter, referred to as “SS”) components having a water content of about 80% is discharged from an outlet provided at the rear end of the dehydration treatment chamber. Is done.

[0008]

However, in the above-mentioned conventional filter rotating rotary sludge dewatering apparatus, when the operation of transporting the concentrated SS to the discharge port by the rotating action of the rotary filter is performed, the following technology is required. Had a strategic problem.

[0009] Opposite mating row surfaces of the dehydration treatment chamber (uneven surface obtained by interlocking a plurality of rotary filters)
And an area surrounded by left and right side walls (of a dehydration processing chamber) in which the rotation axis of the rotary filter is rotatably supported (hereinafter, referred to as “the dehydration chamber”).
It is called "transport path". In (2), while the SS component is condensed and conveyed while the water is filtered out from the sludge by the rotating disk, in this case, in the region near the left and right side walls, the SS comes into contact with the side wall surfaces of the dehydration chamber, By adhering or the like, the SS gradually tends to stay.

In other words, the transport speed of the SS component traveling in the vicinity of the left and right side walls without the self-conveying action is such that the rotation speed is such that the SS component has no contact with the left and right side wall faces and only contacts the mating row surface having the self-conveying action. The transport speed is lower than the transport speed of SS in the central region of the shaft.

As described above, if a difference occurs in the transport speed in the axial direction of the rotating shaft, in some cases, a rupture that communicates with the discharge port is generated in the SS moving while being gradually concentrated on the transport path, A situation occurs in which the sludge liquid (stock solution) passes through the crack without being dehydrated and concentrated, and is discharged as it is.

In order to prevent this situation, conventionally, measures have been taken to reduce the rotation speed (conveyance speed) of the rotary filter as a whole and to equalize the SS conveyance speed in the rotation axis direction. . However, this countermeasure method has a problem that the processing capacity of the entire apparatus is reduced, and a problem that the sludge concentrating power is weakened due to a reduced transport speed.

When the sludge liquid to be treated is an inorganic sludge containing a large amount of solid matter or a highly oil-containing scum containing a large amount of oil, the sludge is easily solidified in the conveying process, so that a disk array having a large conveying force is used. If the rotational speed of the rotary filter is increased by increasing the rotational speed of the rotary filter with the configuration provided in all directions in the rotation axis direction, the load on the rotary filter may become excessive, and the drive system may be hindered. Was. That is, it is difficult to adjust and control the conveying force according to the properties of the sludge liquid in the conventional disk arrangement of the rotary filter.

Therefore, an object of the present invention is to provide a novel idea of devising an arrangement of disks constituting a rotary filter, and (1) transport of SS in the vicinity of the left and right side walls in the transport path of the dehydration chamber. The force can be increased compared to the transport force in the central area. (2) The SS transport amount can be equalized in the rotation axis direction. (3) It is possible to appropriately cope with dehydration and concentration of inorganic sludge having a large amount of solid matter and high oil-containing scum containing a large amount of oil. It is an object of the present invention to provide a "sludge dewatering treatment apparatus" capable of achieving the above-mentioned requirements.

[0015]

Means for Solving the Problems In order to achieve the above object, the present invention employs the following means in a filter rotating rotary sludge dewatering apparatus. According to the first aspect, first, a plurality of rotary filters having a configuration in which a large number of disks are arranged at predetermined intervals in the rotation axis direction are arranged in a dehydration processing chamber so as to form an intersecting row. The sludge liquid supplied to the processing chamber is conveyed and discharged while being filtered and dewatered by the rotation of the rotary filter. Then, by means for changing only the arrangement of the disks, the sludge conveying force in the region near the left and right side walls (of the dehydration processing chamber) supporting (rotatably) the rotating shaft is reduced by the axial direction of the rotating shaft. 1) It is configured to be larger than the sludge conveying force in the central area. Here, the conveying power of the sludge is such that the sludge entering the pocket-shaped recess formed over a number of locations on the mating row surface formed by intersecting disks of different diameters of the adjacent rotary filtration bodies, ( Rotation of the disc (of the rotary filter) results in a sequential scraping action to the outlet side. Therefore, in the above-described means, the arrangement of the discs having a predetermined shape constituting the rotary filter is changed between the region near the left and right side walls (both ends of the rotating shaft) and the central region of the rotating shaft. Thereby, the density (appearance frequency) of the concave portion (or the disk row having a large conveying force) into which the sludge enters is changed between the region near the left and right side walls and the central region of the rotating shaft. By this simple means, the carrying force of the SS in the region near the left and right side walls in the carrying path formed in the dehydration processing chamber is surely larger than the carrying force in the central region of the rotating shaft. As a result, the transporting force in the region SS near the right and left side walls caused by the contact or adhesion of the SS to the side wall is increased, and the transport speed of the sludge at or above a certain level is secured. On the other hand, since the transport speed of SS in the central region of the rotating shaft is reduced, it is possible to smoothly transport solidified sludge such as inorganic sludge and highly oil-containing scum. In order to match the transport speed in the area near the left and right side walls and the transport speed in the central area, without using the conventional method of slowing down the rotation speed of the rotary filter, based on the transport characteristics of the rotary filter, The transport speed in the rotation axis direction can be equalized. That is, in the present invention, the transport speed of the SS is adjusted or controlled by a simple means of selecting a plurality of types of disks generally used for the rotary filter and changing only the arrangement (how to arrange) with respect to the rotation axis. It becomes possible.

According to a second aspect of the present invention, in a region near the left and right side walls according to the first aspect, a large-diameter large disk and a small-diameter small disk are alternately inserted into the rotary shaft, and the central region described in the first aspect. In the above, a middle disk having a diameter smaller than the diameter of the large disk and larger than the diameter of the small disk is interposed between the large disk and the small disk. In this means, first, three types of disks, a "large disk", a "medium disk", and a "small disk", are prepared in the order of diameter, and only the "array configuration" of these disks is set. By changing it, the transport speed of the SS is adjusted or controlled. First, in the region near the left and right side walls where the SS tends to stay and the transport speed tends to be slow, large disks and small disks are alternately inserted on the rotating shaft. In this arrangement, the small disk functions as a spacer member for forming a gap between the large disk and the large disk. Partial areas are respectively fitted, and the rotary filters form an intersecting row with each other. On the other hand, in the central region of the rotating shaft which is not affected by the side wall resistance, a middle disk is arranged and arranged between the large disk and the small disk. Make sure the disks are facing each other. The disk row portion in which the middle disks are arranged with their outer peripheral surfaces facing each other has a small degree of unevenness, and additionally, the peripheral speed of the disks accompanying the rotation of the rotating shaft is exactly the same. For this reason, the degree of unevenness is large,
The conveying force is extremely weaker than that of a disc row portion in which a large disc and a small disc having different peripheral speeds are arranged with their outer peripheral surfaces facing each other. Therefore, in the central region of the rotating shaft, the sludge conveying force is reduced by interposing the disk row portion formed only by the middle disk between the disk rows formed by the large disk and the small disk. be able to.

As described above, it is desirable to keep sludge from remaining on the inner wall surfaces of the left and right side walls of the dehydration treatment chamber as much as possible. Therefore, at least the inner wall surface portions of the left and right side walls are made of stainless steel which has been conventionally used. Also, it is desirable to select and form a material having excellent surface smoothness. For example, a material in which a surface is coated on a substrate with a synthetic resin is conceivable. By using both the means for reducing the side wall resistance and the above means for increasing the conveying force in the region near the side wall, it is possible to synergistically prevent a decrease in the conveying speed in the region near the side wall.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a sludge dewatering apparatus according to the present invention will be described below with reference to the accompanying drawings. <Overall Configuration of Sludge Dehydration Processing Apparatus> First, the overall configuration of the sludge dehydration processing apparatus 1 will be described with reference to FIG.

The sludge dewatering apparatus 1 (hereinafter, referred to as the sludge dewatering apparatus) according to the present invention
It is referred to as “device 1”. ) Includes a substantially box-shaped dehydration chamber 2 surrounded on all sides by walls. A sludge supply port 3 for supplying (introducing) a sludge liquid (raw liquid) 5 transferred through a predetermined refining process to the dehydration processing chamber 2 is provided on a front wall surface 201 of the dehydration processing chamber 2. I have. Opposite rear wall surface 20
2 is provided with an outlet 4 for discharging the dewatered cake 13 that has been dehydrated and concentrated.

A chute 21 that is slightly downwardly inclined is attached to the discharge port 4. Above the chute 21, the discharge port 4 is acted upon by the weight of the weight plate 18.
A resistance plate 19 configured to close the
It is biased upward and rotatably supported. The resistance plate 19 exerts an effect of adjusting the pressure (dehydration under pressure) of the sludge in the dehydration processing chamber 2, and the dehydration rate of the sludge can be increased as the pressure is increased.

Inside the dehydration processing chamber 2, it is laid in the direction of the left and right side walls 204, 205 of the processing chamber 2,
A rotating shaft 8, the shaft end of which is rotatably supported by 205;
, Are roughly arranged in two upper and lower stages.
These rotating shafts 8 are driven by a motor (not shown).
The gears are simultaneously rotated via gears and the like disposed in the outer wall regions of the side walls 204 and 205, so that the number of rotations can be adjusted or controlled as a whole. Reference numeral 9 in FIG.
Reference numerals a and 9b denote filtrate outlets mainly for discharging the water 15 that has been filtered out by the exchange line 7 described later.

<Arrangement of Disks in Rotary Filter>
As shown in FIG. 2, which is a partially omitted plan view of the periphery of the rotation shaft 8 on the lower side of the dehydration processing chamber 2 as viewed from above, and FIG. 3, which is an arrangement diagram of disks inserted into the rotation shaft 8, Rotating shafts 8, 8,
... are three kinds of ring-shaped disks 10, 1 having different diameters.
1, 12 are inserted so as to form a predetermined arrangement.

More specifically, for example, a large disk 10 having a large diameter (for example, φ120 mm, thickness 1.2 mm),
Medium disk 11 (eg, φ111.6 mm, thickness 1.2 mm), small diameter (eg, φ103 mm, thickness 1.5 m)
The small disk 12 of m) is prepared.

Then, the left and right side walls 204,
3 (A) and FIG.
As shown in FIG. 5, large disks 10 and small disks 12 are alternately arranged in a predetermined length (referred to as “array example 1”).

On the other hand, as shown in FIG. 3 (B) and FIG. 7, the large disc 10 → the middle disc 11 → the small disc is located substantially in the central area C of the rotary shaft 8 (excluding the neighboring areas Wa and Wb). The disks 12 are arranged in the direction of the rotating shaft 8 in the order of the disk 12, the medium disk 11, the large disk 10, the medium disk 11, the small disk 12, and so on (referred to as "array example 2").

Alternatively, as shown in FIG.
Arranged in the direction of the rotating shaft 8 in the order of the middle disk 11 → the large disk 10 → the small disk 12 → the middle disk 11 → the large disk 10 (hereinafter, “arrangement example 3”). Furthermore, as an example of an arrangement that can be particularly adopted in the central region C, a portion where two middle disks 11 overlap is provided, and a large disk 10 → a middle disk 11 → a middle disk 11 → a small disk 12
→ Large disk 10 → Middle disk 11 → Middle disk 11 → Small disk 12 ...
May be arranged in the direction of the rotation axis 8 ("arrangement example 4", not shown).

Conventionally, the arrangement of the discs in the rotary filter is the same in the direction of the rotation axis 8. The technical idea of forming a portion in which the arrangement order (arrangement) of the discs is changed by using is completely new.

Here, the arrangement of the discs 10, 11, 12 is not limited to the above arrangement example, but may be appropriately selected or combined as long as the arrangement is such that the strength of the sludge can be increased. It is possible.

For example, the arrangement examples 1 and 2 are combined, and the large disks 10 and the small disks 12 are alternately arranged in a predetermined length in the side wall vicinity areas Wa and Wb as described above. Disk 10 → Medium disk 11 → Small disk 12 → Medium disk 11
It is also possible to arrange in the direction of the rotating shaft 8 in order of → the large disk 10 → the middle disk 11 → the small disk 12.

Further, the arrangement examples 1 and 2 are combined, and in the side wall vicinity regions Wa and Wb, the large disc 1
0 and small discs 12 are alternately arranged in a predetermined length, and in the central region C, the small disc 12 → the middle disc 11 → the large disc 10 → the small disc 12
It is also possible to arrange in the direction of the rotating shaft 8 in the order of → the middle disk 11 → the great circle.

Thus, the left and right side walls 204, 205
And the substantially central region C of the rotating shaft 8 in the vicinity regions Wa and Wb of
The rotating shaft 8 configured to change the arrangement of the disks 10, 11, and 12 is provided with rotary filters 6a to 6e and 7a to 7
Plays the role of j.

That is, the rotary filters 6a to 6e, 7a to
7j is a large number of discs 10, 1 which are in contact with each other and face each other.
The sludge liquid 5 enters the gap Y (see FIG. 4) formed between the discs 1 and 12 by a capillary action and a pressure difference, and exerts an action of filtering out the water 15 by a rotating action of the discs 10, 11, and 12. I do. The filtered water 15 is discharged from a filtrate outlet 9a, 9b provided at the bottom 203 of the dehydration chamber 2 to a water collecting tank (not shown) (see FIG. 1 and the like).

Here, the rotary filter bodies 6a to 6e are arranged in the upper region of the dehydration treatment chamber 2 so as to form an intersecting row 6 which is gradually inclined upward toward the discharge port 4 side. On the other hand, the rotary filtration bodies 7 a to 7 j are arranged in a lower row of the dehydration treatment chamber 2 in a replacement row 7.

The rotary filter bodies 7f to 7j disposed substantially below the rotary filter bodies 6a to 6e are inclined slightly more steeply than the mating rows 6 (rotary filter bodies 6a to 6e) toward the discharge port 4 side. Are arranged. With this configuration, the rotary filter bodies 6a to 6a to
6e and the transport path 20 sandwiched between the rotary filter bodies 7f to 7j are:
The gap is gradually narrowed as approaching the discharge port 4.

The sludge that has been compressed and dewatered by the rotation of the rotary filters 6a to 6e and 7a to 7j and is forcibly conveyed while gradually losing water is further pushed into a narrower area in front of the conveying path 20. By doing so, the concentration of sludge is promoted more effectively.

Here, FIG. 4 shows the transport path 2 in the region W near the side wall.
0 is cut off vertically and viewed from the side,
It mainly shows the movement of the sludge S and the state of dehydration and concentration in a simplified manner. As shown in FIG. 4, the sludge S moves along the gradually narrowing conveyance path 20 by the rotating action of the rotary filters 6 b, 6 c, 6 d and the rotary filters 7 g, 7 h, 7 i, and water from the sludge S is removed from the sludge S. 15 is filtered off and discs 10, 1
It falls from each gap of 1 and 12.

<Structure of the replacement rows> Here, the configuration of the replacement rows 6 and 7 will be described in detail mainly with reference to FIGS. First, as shown in FIG. 5 which is an enlarged view showing a part of the contact portion between the rotary filter bodies 6a and 6b of the contact row 6 partially omitted,
A part of the periphery of the disk of the adjacent rotary filter 6b is provided in a gap T (see FIG. 2) formed between the disks arranged in a large number so as to protrude in the circumferential direction of the rotary shaft 8 of the rotary filter 6a. The disks are in mesh with each other by the fitting of the regions.

Specifically, the adjacent rotary filter bodies 6a to 6
e, the large disk 10 on one side of 7a to 7j is opposed to the small disk 12 on the other side, and one middle disk 11 is
It meshes with the regularity of facing 1.

FIG. 6 is a perspective view showing the appearance (arrangement example 1) of the mating row state of the side wall vicinity region Wa (or Wb) (the thickness of the disk and the diameter difference are emphasized for easy understanding). Is). FIGS. 7 and 8 are external perspective views showing the state of intersecting rows of the central region C of the rotating shaft 8 (the thickness of the disc and the difference in diameter are emphasized for easy understanding). 7 and 8 correspond to Arrangement Example 2 and Arrangement Example 3 described above.

First, as shown in FIG. 6, in the intersecting row of the region Wa (or Wb) near the side wall, the large disk 10 → the small disk 12 → the large disk in the direction perpendicular to the rotation shaft 8. → small disc 12 ... disc row L ₁ of, in parallel closely adjacent.

Here, as shown in FIG. 9 (A), which is a view of the disk row L ₁ taken out only one row and viewed from the lateral direction, the disk row L ₁ Due to the large diameter difference between 10 and 12, a large pocket area X into which the sludge S enters is formed, and the degree of unevenness increases.
For this reason, the penetration into the sludge S is large.

In addition, the peripheral speed v of the small disk 12 and the large disk 1
Since a difference occurs in the peripheral speed V of 0, the action of scraping the sludge S sent into the pocket X into the next pocket area X and effectively sending the sludge S is exerted effectively, so that the sludge conveying force (transport speed) P _1. Is big.

On the other hand, the mating line region of the disc in the central region C having the sequence Examples 2-4, etc., between the disc rows L _1, in the direction perpendicular to the rotation axis 8, the middle disk 11 → middle disk 11 → middle disc 11 ... disc column L ₂ of is the intervention at a predetermined frequency (see FIGS. 6 and 7).

As shown in FIG. 9 (B), which is a view of one disk row L ₂ taken out and viewed from the lateral direction, the disk row L ₂ has only the middle disk 11 of the same diameter. from being formed, such as a disc column L ₁ that is formed by the large disc 10 a small circular plate 12 facing, large pocket area X (FIG. 9
(A)) is not formed.

For this reason, the disc row L ₂ has a smaller degree of unevenness than the disc row L ₁ and has less bite into sludge. In addition, since the circumferential speed of the disc 11 in the adjacent V 'are the same, the conveying force of the sludge S (conveying speed) P ₂ is less (P ₂ <P _1).

Therefore, the disk row L ₁ having a large conveying force P ₁ is
The more closely formed in the direction of the rotation axis 8, the more the region W near the side wall
The conveying force of the sludge S in the contact row area of a (or Wb) can be effectively increased. On the other hand, the conveying force P ₂ is smaller disc column L _2, extent to be caused to intervene rotation axis 8 direction, the conveying force decreases.

[0047] For example, the "sequence Example 2" shown in FIG. 7, when viewed in the axial direction of the rotary shaft 8, but the disc rows L ₁ and disc columns L ₂ are alternately arranged, in FIG. 8 In "arrangement example 3" shown, 3
At a frequency of one column for the column, disc column L ₂ is formed. Thus, towards the arrangement example 3 than the arrangement example 2, since the occurrence frequency of large disc column L ₁ of the conveying force is large, the sludge conveying force P increases.

[0048] Thus, if the rotary filter having a different arrangement configuration is selectively used according to the properties of the solid content of the sludge liquid (stock solution) 5 and the like, and the transport force (transport speed) P is adjusted or controlled, Dehydration and concentration suitable for the sludge solution 5 can be reliably performed.

<Experimental Example> The inventors of the present invention have a width of 500 m.
m, the arrangement example 1 (see FIG. 6) is provided in the side wall vicinity regions Wa and Wb by 25 to 60 mm in length from the side walls 204 and 205, and the arrangement example 2 is provided in the remaining central region C. (See FIG. 3) and an array configuration (“Experimental example 1”) and an array configuration in which all directions in the rotation axis 8 are unified in the array example 1 (“Comparative experimental example 2”) are used. Thus, dehydration of high oil content scum was attempted under the same rotation conditions. The solid content of the high oil content scum used was 7.3.
% And oil content were 6.5%.

As a result, in Experimental Example 1, the processing amount was 50 to
While 150 kg DS / mhr was obtained, the water content of the dehydrated cake 13 was 75 to 80%. On the other hand, in Comparative Experimental Example 2, the processing amount was 50 to 100 kg · DS / m · h.
r, and the water content of the dehydrated cake 13 is 78 to 8
2%. From this, it was found that the dewatering treatment apparatus 1 according to the present invention has a high upper limit of the treatment amount and can suppress the water content of the dewatered cake 13 by about 3%.

[0051]

According to the sludge dewatering apparatus of the present invention, first, the arrangement of the disks constituting the rotary filter is changed between the region near the side wall and the central region by a simple means. The conveying force of the sludge in the region near the left and right side walls of the conveying path can be made larger than the conveying force in the central region. This makes it possible to equalize the amount of sludge conveyed in the direction of the rotating shaft without having to largely adjust the rotating speed of the rotating shaft. In addition, since the sludge that is generated when the conveying speed in the rotation axis direction is different is not generated in the sludge, the sludge liquid (raw liquid) that is not dewatered and concentrated is not discharged as it is. In addition, since a rotary filter having a conveying force suitable for dehydration and concentration of inorganic sludge having a large amount of solids can be provided by variously changing the arrangement of the disks, an excessive load is applied to the rotary filter during operation. There is no such thing. Further, the upper limit of the treatment amount can be increased, and the water content of the obtained dehydrated cake can be suppressed low. As described above, the sludge dewatering treatment apparatus according to the present invention can smoothly perform the dewatering and concentration treatment, which is the final treatment step of sludge generated from a wastewater treatment system or the like.

[Brief description of the drawings]

FIG. 1 is a simplified diagram showing the configuration of the inside of a dehydration treatment chamber of a sludge dehydration treatment device according to the present invention.

FIG. 2 is a partially omitted plan view of the periphery of the rotary filter on the lower side of the dehydration processing chamber as viewed from above.

FIG. 3A is a diagram showing an arrangement of disks inserted into a rotating shaft (corresponding to arrangement example 1), and FIG. 3B is a diagram showing an arrangement of the disks (corresponding to arrangement example 2).

FIG. 4 is a view of a part of the transport path in the vicinity of the side wall, which is cut off vertically and viewed from the side.

FIG. 5 is an enlarged view showing a part of the contact portion of an adjacent rotary filter body partially omitted;

FIG. 6 is an external perspective view showing a state of a mating row (arrangement example 1) in a region near a side wall.

FIG. 7 is an external perspective view showing an intersecting row state (arrangement example 2) of a central area of the rotation shaft.

FIG. 8 is an external perspective view showing an intersecting row state (arrangement example 3) of a central area of the rotation shaft.

9 (A) is disc column L ₁ is taken out by a row, as viewed from the lateral direction (B) disc column L ₁ and is taken out only one row, as viewed from the side Figure

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Dehydration processing apparatus 2 Dehydration processing chamber 5 Sludge liquid 6a-6e (Upper stage) Rotary filter body 7a-7j (Lower stage) Rotary filter unit 8 Rotary shaft 10 Large disk 11 Medium disk 12 Small disk C Central area of rotary shaft S Sludge Wa, Wb Area near left and right side walls

Claims (2)

[Claims] 1. A plurality of rotary filters in which a number of disks are arranged at predetermined intervals in a rotation axis direction are arranged in a dehydration chamber so as to form an intersecting row, and are supplied to the dehydration chamber. The sludge liquid is conveyed while being filtered and dewatered by the rotation of the rotary filter body, and is discharged. The means for changing the arrangement of the disks is provided in the vicinity of the left and right side walls that support the rotating shaft of the dehydration processing chamber. A sludge dewatering apparatus characterized in that the sludge conveying force in the region is made larger than the sludge conveying force in the central region of the rotating shaft. 2. In the vicinity of the left and right side walls, a large-diameter large disk and a small-diameter small disk are arranged alternately with respect to the rotary shaft. The sludge according to claim 1, further comprising an arrangement in which a middle disk having a diameter smaller than the diameter of the plate and larger than the diameter of the small disk is interposed between the large disk and the small disk. Dehydration processing equipment.