JP7152009B2 - Sludge dehydrator - Google Patents

Description

The present invention relates to a sludge dehydrator for removing water from sludge.

Sludge generated in a sewage treatment process at a sewage treatment plant, a waste liquid treatment process in a factory, or the like basically consists of solid matter and water. Therefore, when treating sludge, it is necessary to separate solids and water. Conventionally, as a means to separate water from sludge, the filter press method, in which the sludge is wrapped in an accordion-shaped filter cloth and contracted, is dehydrated. A screw press method and the like in which sludge is introduced and dewatered are known.

However, since the filter press method is basically a batch process, the sludge to be treated cannot be treated continuously, and there is a problem that the throughput is limited and the filter cloth is clogged. Moreover, the screw press method has a problem that the apparatus is relatively complicated and large-scale.

SUMMARY OF THE INVENTION The present invention has been developed in view of such circumstances, and an object of the present invention is to provide a sludge dewatering apparatus that can continuously treat sludge and has a relatively simple structure.

The sludge dewatering apparatus according to claim 1 of the present application includes a lower belt conveyor that is inclined upward from a sludge input port toward a sludge discharge port and extends longitudinally from the sludge input port to the sludge discharge port; an upper belt conveyor located above the lower belt conveyor so as to be in contact with the conveyor belt of the lower belt conveyor and extending longitudinally from the middle of the lower belt conveyor to the sludge discharge port; wherein the pitch of the small-diameter carrier roller of the lower belt conveyor and the pitch of the large-diameter carrier roller of the upper belt conveyor are substantially the same, and the upper belt conveyor comprises a pair of left and right frames, and A driving pulley and a driven pulley respectively arranged at both ends, an endless conveying belt stretched between the driving pulley and the driven pulley, and a large number of carrier rollers supporting the lower part of the conveying belt. wherein the lower belt conveyor comprises a pair of left and right frames, a driving pulley and a driven pulley respectively arranged at both ends of the frame, and an endless conveying system stretched between the driving pulley and the driven pulley. It has a belt and a number of carrier rollers that support the upper part of the conveyor belt, and is configured such that the lower surface of the frame of the upper belt conveyor and the upper surface of the frame of the lower belt conveyor are in close contact. It is characterized by

The sludge dewatering apparatus according to claim 2 of the present application is the sludge dewatering apparatus according to claim 1 , wherein the upper surface of the conveying belt of the lower belt conveyor is a predetermined distance from the upper surface of the frame of the lower belt conveyor. It is characterized in that it is configured to be located only downward.

The sludge dewatering apparatus according to claim 3 of the present application is the sludge dewatering apparatus according to claim 1 or 2 , wherein a gap is substantially generated between the frame and both edges of the conveying belt in the lower belt conveyor. and the upper belt conveyor is configured so that substantially no gap is formed between the frame and both edges of the conveying belt.

The sludge dewatering apparatus according to claim 4 of the present application is the sludge dehydrating apparatus according to any one of claims 1 to 3 , wherein the sludge inlet has the sludge inlet and the end on the side of the upper belt conveyor is the conveying device. It is characterized in that it is formed in a planar shape that narrows along the center line of the belt.

According to the present invention, a sludge dewatering device 10 that can be continuously treated is obtained. In the sludge dewatering device 10, the belt conveyor 16 is inclined downward toward the sludge input port 12, so that water in the sludge flows down in the direction opposite to the conveying direction. Further, since the sludge dehydrating apparatus 10 is roughly divided into a conveying section and a dehydrating section, it can be easily modified to a desired form according to the intended use. Further, in the sludge dewatering apparatus 10, since the lower surface of each frame 18a of the upper belt conveyor 18 and the upper surface of each frame 16a of the lower belt conveyor 16 are in close contact with each other, sludge and water leak laterally. can be prevented. In addition, in the sludge dewatering device 10, the upper surface of the transport belt 16d is positioned in consideration of the thickness of the transport belt 18d and the thickness of the dewatered solid matter. In the sludge dewatering apparatus 10, the belt conveyors 16 and 18 are configured so that substantially no gaps are formed between the frames 16a and 18a and the edges of the conveyor belts 16d and 18d. Leakage and downward flow can be avoided, and meandering of the conveyor belts 16d and 18d can be prevented. Furthermore, in the sludge dewatering apparatus 10, the end 12a of the sludge input port 12 on the side of the upper belt conveyor 18 is formed in a flat shape so that the width is narrow, so that the entire sludge to be treated can be dewatered evenly. can. Since the sludge dewatering apparatus 10 of the present invention has a relatively simple structure, the manufacturing cost is relatively low and maintenance is easy.

1 is a partially cutaway perspective view of a sludge dewatering device according to a preferred embodiment of the present invention; FIG. FIG. 2 is a longitudinal sectional view of the sludge dewatering device of FIG. 1; It is the perspective view which separated and showed the lower side belt conveyor and the upper side belt conveyor. FIG. 4(a) is an enlarged perspective view showing the starting end of the upper belt conveyor, and FIG. 4(b) is an enlarged sectional view showing the positional relationship between upper and lower carrier rollers. FIG. 2 is a plan view of the sludge dewatering device of FIG. 1; Figure 6 is an enlarged view of portion 6 of Figure 5; It is the perspective view which showed the sludge inlet.

Next, with reference to the drawings, a sludge dewatering apparatus according to a preferred embodiment of the present invention will be described in detail. FIG. 1 is a partially cutaway perspective view of the sludge dewatering device, and FIG. 2 is a longitudinal sectional view of the sludge dewatering device. A sludge dewatering apparatus according to a preferred embodiment of the present invention, indicated generally by reference numeral 10 in FIGS. It has a lower belt conveyor 16 that extends longitudinally to the sludge outlet 14 .

The lower belt conveyor 16 includes a pair of left and right frames 16a, a drive pulley 16b and a driven pulley 16c arranged at both ends of the frame 16a, a motor (not shown) for rotating the drive pulley 16b, and a drive pulley 16b. It has an endless conveyor belt 16d that is stretched between the pulley 16b and the driven pulley 16c, and a number of carrier rollers 16e that support the upper portion of the conveyor belt 16d. The transport belt 16d is made of an elastic material such as rubber.

A number of return rollers for supporting the lower portion (return portion) of the conveying belt 16d and a tension roller for applying a tensile force to the conveying belt 16d may be arranged on the lower belt conveyor 16. Omitted for brevity.

The sludge dewatering device 10 also has an upper belt conveyor 18 which is positioned in contact with and inclined upward from the lower belt conveyor 16 and which extends longitudinally from the middle of the lower belt conveyor 16 to the sludge discharge port 14 . I have it.

The upper belt conveyor 18 includes a pair of left and right frames 18a, a driving pulley 18b and a driven pulley 18c arranged at both ends of the frame 18a, a motor (not shown) for rotating the driving pulley 18b, and a driving pulley. It has an endless conveyor belt 18d that is stretched between 18b and a driven pulley 18c, and a number of carrier rollers 18e that support the lower portion of the conveyor belt 18d. The transport belt 18d is made of an elastic material such as rubber.

A large number of return rollers for supporting the upper portion (return portion) of the transport belt 18d and tension rollers for applying tensile force to the transport belt 18d may be arranged on the upper belt conveyor 18, but the drawing is simplified. is therefore omitted.

The pitch of the carrier rollers 16e of the lower belt conveyor 16 and the pitch of the carrier rollers 18e of the upper belt conveyor 18 are substantially the same. That is, as best shown in FIG. 2, the center of rotation of each carrier roller 16e of the lower belt conveyor 16 and the center of rotation of each carrier roller 18e of the upper belt conveyor 18 are positioned on a line L perpendicular to the conveyor belt. is configured to Also, as shown, carrier roller 16e has a small diameter and carrier roller 18e has a large diameter. Here, the terms "large diameter" and "small diameter" refer to relative diameters of both (carrier rollers 16e and 18e), and do not represent specific diameters. Since the pitches of the upper and lower carrier rollers 16e and 18e are substantially the same, and each carrier roller 18e located on the upper side has a relatively large diameter, the sludge to be treated traveling between the upper and lower conveying belts 16d and 18d is removed. , and the carrier rollers 16e and 18e are subjected to a large compressive force, thereby efficiently compressing the sludge to be treated.

As shown in FIG. 2, the sludge treatment apparatus 10 is roughly divided into a conveying section in which only the lower belt conveyor 16 is arranged and a dewatering section in which both the lower belt conveyor 16 and the upper belt conveyor 18 are arranged. be. Thereby, the sludge dewatering apparatus 10 can be designed as desired according to the application and various installation conditions. For example, when it is preferable to separate the sludge generation (input) point and the discharge point after treatment, the distance of the conveying unit is increased, or the type of sludge to be treated is difficult to treat. In such a case, it is assumed that the distance of the dewatering section is lengthened. In addition, although the illustrated sludge treatment apparatus 10 is shown in which the conveying section and the dewatering section are integrated, it is also possible to manufacture the conveying section and the dewatering section separately and connect them when in use. is.

Preferably, the lower surface of each frame 18a of the upper belt conveyor 18 and the upper surface of each frame 16a of the lower belt conveyor 16 are configured to be in close contact with each other, as shown in FIG. 4(a). Thereby, sludge and water can be prevented from leaking to the side.

Also, preferably, the upper surface of the conveying belt 16d of the lower belt conveyor 16 is configured to be positioned a distance x below the upper surface of each frame 16a, as shown in FIG. 4(b). The distance x is usually about 3 mm to 5 mm. The reason for this configuration is that the thickness of the conveyor belt 18d and the thickness of the dehydrated solids (dewatered cake) are taken into consideration (i.e., if not configured in this way, the frame of the lower belt conveyor 16 This is because we were afraid that the solid content would move above 16a).

As shown in FIG. 6, the lower belt conveyor 16 is configured so that substantially no gap is generated between each frame 16a and both edges 16d1 and 16d2 of the conveyor belt 16d. Similarly, the upper belt conveyor 18 is configured so that substantially no gap is generated between each frame 18a and both edges 18d1 and 18d2 of the conveyor belt 18d. As a result, it is possible to prevent sludge and water from leaking and flowing downward, and to prevent meandering of the conveyor belts 16d and 18d.

FIG. 7 is a perspective view showing a preferred form of the sludge inlet 12. As shown in FIG. The sludge input port 12 shown in FIG. 7 is located on the side of the dewatering section (therefore, on the side of the upper belt conveyor 18), and the short side wall 12a arranged so as to be orthogonal to the conveying direction of the lower belt conveyor 16. , a long side wall 12b located on the opposite side of the short side wall 12a and arranged parallel to the short side wall 12a, and a pair of oblique side walls 12c and 12d connecting the short side wall 12a and the long side wall 12b. It has a trapezoidal shape in plan view. An opening 12a1 is provided in the short side wall 12a, and elongated rubber pieces 12b1, 12c1 and 12d1 are attached to the lower ends of the long side wall 12b and the oblique side walls 12c and 12d, respectively. The upper and lower surfaces of the sludge inlet 12 are open, and the lower surface (thus rubber pieces 12b1, 12c1, 12d1) rests on the conveying belt 16d of the lower belt conveyor 16.

By forming the planar shape of the sludge inlet 12 so that the upper belt conveyor 18 side becomes narrower as described above, the sludge to be treated that is introduced into the sludge inlet 12 flows from the opening 12a1 to the center of the conveying belt 16d. Since the sludge converges near the line, the entire sludge to be treated can be dewatered evenly. That is, when the sludge to be treated is compressed between the conveyor belts 16d and 18d, it tries to escape to both ends of the conveyor belts 16d and 18d. , such a situation can be avoided as much as possible.

Since the rubber pieces 12b1, 12c1 and 12d1 are provided at the lower end of the sludge inlet 12, the upper surface of the conveyor belt 16d and the rubber pieces 12b1, 12c1 and 12d1 are always in contact with each other. Part of the water content of the sludge to be treated flows out from the sludge treatment port 12 through gaps caused by frictional fluctuations with the rubber pieces 12b1, 12c1, and 12d1, and is discharged from the discharge port 20.

The use of the sludge dewatering apparatus 10 configured as above will be described. As shown in FIG. 2, the sludge to be treated is introduced into the sludge inlet 12, and the belt conveyors 16, 18 are driven. Then, due to the characteristic planar shape of the sludge input port 12, the sludge to be treated that has been input exits in a converged state near the center line of the transport belt 16d and is transported to the dewatering section where the upper belt conveyor 18 is arranged. be. Then, the sludge to be treated is compressed in the dewatering section, and the dehydrated solid content is discharged from the sludge discharge port 14 . On the other hand, water in the sludge to be treated flows down on the conveying belt 16 d due to gravity and is discharged from the discharge port 20 located at the bottom of the sludge dewatering device 10 .

The present invention is not limited to the embodiments of the invention described above, and various modifications are possible within the scope of the invention described in the claims, and these are also included in the scope of the invention. It goes without saying that it is a thing.

For example, the details, dimensions, cardinal numbers, etc. of each component of the illustrated sludge dewatering device 10 (sludge input port 12, sludge discharge port 14, lower belt conveyor 16, upper belt conveyor 18, drain port 20, strut 22) are merely exemplary.

10 sludge dehydrator 12 sludge inlet 12a short side wall 12a1 outlet opening 12b long side wall 12b1 rubber piece 12c oblique side wall 12c1 rubber piece 12d oblique side wall 12d1 rubber piece 14 sludge discharge port 16 lower belt conveyor 16a frame 16b drive pulley 16c driven Pulley 16d Conveyor belt 16e Carrier roller 18 Upper belt conveyor 18a Frame 18b Drive pulley 18c Driven pulley 18d Conveyor belt 18e Carrier roller 20 Drain port 22 Support

Claims (4)

A sludge dewatering device for removing water from sludge,
a lower belt conveyor that slopes upward from the sludge inlet to the sludge outlet and extends longitudinally from the sludge inlet to the sludge outlet;
An upper belt conveyor located above the lower belt conveyor so as to be in contact with the conveyor belt of the lower belt conveyor and extending longitudinally from the middle of the lower belt conveyor to the sludge discharge port. and
The pitch of the small-diameter carrier roller of the lower belt conveyor and the pitch of the large-diameter carrier roller of the upper belt conveyor are substantially the same ,
The upper belt conveyor comprises a pair of left and right frames, a driving pulley and a driven pulley respectively arranged at both ends of the frame, an endless conveying belt stretched between the driving pulley and the driven pulley, and a number of carrier rollers supporting the lower portion of the conveyor belt;
The lower belt conveyor comprises a pair of left and right frames, a driving pulley and a driven pulley respectively arranged at both ends of the frame, and an endless conveying belt stretched between the driving pulley and the driven pulley; and a number of carrier rollers supporting the upper portion of the conveyor belt,
A sludge dewatering apparatus , wherein the lower surface of the frame of the upper belt conveyor and the upper surface of the frame of the lower belt conveyor are in close contact with each other . 2. The apparatus according to claim 1 , wherein the upper surface of the conveying belt of the lower belt conveyor is positioned lower than the upper surface of the frame of the lower belt conveyor by a predetermined distance. Sludge dewatering equipment. The lower belt conveyor is configured so that substantially no gap is formed between the frame and both edges of the conveyor belt, and the upper belt conveyor is configured to have substantially no gap between the frame and both edges of the conveyor belt. 3. The sludge dewatering apparatus according to claim 1, wherein the sludge dewatering apparatus is constructed so that substantially no gap is generated between the two. 3. The sludge inlet is formed in a planar shape such that the end on the side of the upper belt conveyor becomes narrower along the center line of the conveyor belt. The sludge dewatering device according to any one of the preceding paragraphs.

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