JP2005131522A - Belt type concentrator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a belt type concentrator capable of enhancing filtration efficiency to enhance the degree of concentration of discharged sludge. <P>SOLUTION: In this belt type concentrator for gravitationally concentrating sludge 3 while feeding the same by a revolving endless belt 10, a feed track for feeding the sludge 3 to a sludge discharge part 4 from a sludge supply part 2 by the endless belt 10 is formed. The feed track is constituted of a horizontal part 23a formed over the range from the sludge supply part 2 to a midway place of the feed track and a downgrade inclined part 23b formed over the range from the horizontal part 23a to the sludge discharge part 4. The sludge 3 becomes a large number of lumps B while tumbled toward a sludge discharge part 4 along the surface of the endless belt 10 in the inclined part 23b to be made nodulated. By this constitution, the dehydration of the sludge is accelerated in the inclined part 23b. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a belt type concentrator used for concentration of surplus sludge (mixed raw sludge, digested sludge, OD surplus sludge) in a sewage treatment plant, for example.

  Conventionally, as this type of belt type concentrator, as shown in FIG. 11, a driven roller 63 is provided on the start end side for supplying the concentration target sludge 62 from the sludge supply unit 61, and the concentration target sludge 62 from the sludge discharge unit 64. There is a drive roller 65 disposed on the terminal end side for discharging the ink, and an endless belt 66 made of a wire mesh belt having water permeability is stretched between these rollers 63 and 65 (see, for example, Patent Document 1).

  According to this, the horizontal conveyance track | orbit 67 which conveys the concentration sludge 62 from the sludge supply part 61 to the sludge discharge part 64 is formed, both rollers 63 and 65 rotate, and the endless belt 66 rotates in one direction. Thus, the concentration target sludge 62 supplied from the sludge supply section 61 onto the endless belt 66 is gravity filtered while being transported on the transport track 67 by the endless belt 66, and then discharged from the sludge discharge section 64.

  However, the belt type concentrator 60 as described above has a problem that it is difficult to further improve the filtration efficiency, and it is difficult to increase the concentration concentration of the sludge 62 discharged from the sludge discharge section 64.

  As a measure for increasing the concentration concentration of the discharged sludge 62, for example, as shown in FIG. 12, a shooter 68 inclined downward is disposed in the sludge discharge portion 64, and the endless belt is disposed on the bottom surface of the shooter 68. There is one in which a filter medium 69 made of a wire mesh belt similar to that of 66 is disposed.

According to this, since the sludge 62 discharged | emitted from the sludge discharge part 64 is further gravity-filtered by the filter medium 69 when sliding down the shooter 68, a concentration density | concentration improves.
However, in the case shown in FIG. 12, the sludge 62 adheres to the filter material 69 and becomes clogged, the filtration efficiency of the filter material 69 is lowered, and the concentrated concentration of the sludge 62 discharged from the shooter 68 is short. In addition, the filter material 69 has to be frequently washed to remove the attached sludge 62, which is troublesome.
JP 2002-326006 A

  An object of the present invention is to provide a belt type concentrator capable of improving the filtration efficiency and increasing the concentration concentration of the discharged sludge.

  In order to achieve the above object, the first invention is a belt-type concentrator that rotates an endless belt having water permeability to filter the sludge to be concentrated while transporting the endless belt with the endless belt. A part of the transport track that transports the sludge from the sludge supply section to the sludge discharge section with an endless belt is formed with a downward inclined slope that rolls down the sludge to be concentrated on the endless belt in the transport direction. .

  According to this, the concentration target sludge supplied from the sludge supply unit onto the endless belt is filtered while being transported on the transport track by the rotating endless belt, and then discharged from the sludge discharge unit. At this time, the sludge to be concentrated is aggregated into a plurality of lumps while rolling down the surface of the endless belt in the conveying direction at the inclined portion of the conveying track. Thereby, dehydration of sludge is promoted in the inclined portion, the filtration efficiency of the belt type concentrator is improved, and the concentration concentration of the discharged sludge is increased.

  Further, according to the second aspect of the present invention, a first peeling means is provided at the starting end portion of the inclined portion, once the sludge to be concentrated conveyed by the endless belt is once peeled from the endless belt and then returned onto the endless belt of the inclined portion. It is what.

  According to this, since the sludge to be concentrated is once peeled from the endless belt by the first peeling means at the start end portion of the inclined portion, the surface of the endless belt is updated to a new surface to which no sludge is attached. Thereby, dewatering of sludge is further promoted in the inclined portion, the filtration efficiency of the belt type concentrator is further improved, and the concentrated concentration of the discharged sludge is increased.

  Further, according to the third aspect of the present invention, the inclined portion is formed from the middle portion of the transport track to the sludge discharge portion, and the sludge discharge portion is provided with the second peeling means for peeling the sludge to be concentrated from the endless belt. It is.

  According to this, the sludge to be concentrated is aggregated while rolling down in the conveyance direction at the inclined portion of the conveyance track, and is discharged from the sludge discharge unit. At this time, the sludge adhering to the surface of the endless belt is peeled off from the endless belt by the second peeling means and discharged from the sludge discharge section. As a result, the surface of the endless belt after the sludge discharge is renewed to a new surface, so that it is possible to prevent the filtration efficiency from being lowered due to the adhesion of the sludge, and the concentrated concentration of the discharged sludge is maintained well over a long period. Be drunk.

  As described above, according to the present invention, the filtration efficiency of the belt type concentrator is improved, and the concentrated concentration of the discharged sludge is increased.

Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
As shown in FIGS. 1 and 2, 1 is dewatered and concentrated by gravity filtration while conveying the sludge 3 to be concentrated supplied from the sludge supply unit 2 (sludge supply chute, etc.) provided at the start end, This is a belt type concentrator that discharges from a sludge discharge section 4 (sludge discharge chute or the like) provided on the side.

  The belt type concentrator 1 includes a start roller 6 disposed on the start end side, an end roller 8 disposed on the end side and driven to rotate by a motor 7, and an intermediate roller disposed between the rollers 6 and 8. 9 and an endless belt 10 stretched between these rollers 6, 8, 9. As shown in FIGS. 3 and 4, support shafts 11 are provided at both ends of each of the rollers 6, 8, and 9, and these support shafts 11 are rotatably supported by a pair of left and right side frames 13 via bearings 12. Has been. Each support shaft 11 is provided with a sprocket 15 positioned between the end of each roller 6, 8, 9 and each side frame 13. Each side frame 13 is erected on a stand 17 having a plurality of legs 16.

  As shown in FIG. 4, a roller-side sprocket 19 is provided at the tip of one support shaft 11 provided at one end of the end roller 8, and as shown in FIG. A drive chain 21 is wound between the sprockets 19 and 20.

The start roller 6 and the intermediate roller 9 are disposed at the same height, and the end roller 8 is disposed below the intermediate roller 9 behind the intermediate roller 9.
As shown in FIG. 1, as the track of the endless belt 10, a transport track 23 that transports the concentration target sludge 3 input from the sludge supply unit 2 to the sludge discharge unit 4, and a position below the transport track 23. A return trajectory 24 that returns from the sludge discharge section 4 to the sludge supply section 2, a terminal-side inversion trajectory 25 that reverses from the transport trajectory 23 to the return trajectory 24, and a start-end-side inversion trajectory 26 that inverts from the return trajectory 24 to the transport trajectory 23. Is formed.

  The transport track 23 is composed of a horizontal portion 23 a formed in a range from the start roller 6 to the intermediate roller 9 and a downward inclined portion 23 b formed in a range from the intermediate roller 9 to the terminal roller 8. Yes. The endless belt 10 is supported from the lower side (back side) by a plurality of support plates 28 in the horizontal portion 23 a of the transport track 23, and is lowered by a plurality of support rollers 29 in the inclined portion 23 b and the return track 24 of the transport track 23. It is supported from.

  A first scraper is disposed at the start end of the inclined portion 23b, after the sludge 3 to be concentrated that has been conveyed along the horizontal portion 23a is once peeled from the surface of the endless belt 10 and then returned onto the endless belt 10 of the inclined portion 23b. 31 (an example of a first peeling means) is arranged. The front end of the first scraper 31 faces the outer peripheral surface of the intermediate roller 9 and is in contact with the surface of the endless belt 10. As shown in FIG. 2, the first scraper 31 is provided between the pair of side frames 13 via the attachment frame 32.

  The sludge discharger 4 is provided with a second scraper 33 (an example of a second peeling means) for peeling the concentration target sludge 3 from the surface of the endless belt 10. The tip of the second scraper 33 is in contact with the surface of the endless belt 10 so as to face the outer peripheral surface of the terminal roller 8. As shown in FIG. 2, the second scraper 33 is provided between the pair of side frames 13 via the attachment frame 34.

  The pair of side frames 13 is provided with a pair of left and right guide bodies 36 for preventing the concentration target sludge 3 transported along the transport track 23 from falling from the endless belt 10 to both outer sides. ing.

  As shown in FIGS. 5 and 6, the endless belt 10 includes a plurality of metal or resin wire rods 10a that are spirally arranged in parallel with each other, and linear bones are disposed on the plurality of wire rods 10a. It is a mesh belt configured by inserting the wire 10b. The endless belt 10 has a multilayer structure having a gap 10c between an upper layer and a lower layer made of the wire 10a, and each layer has minute openings 10d formed between adjacent wires 10a at appropriate intervals. . Thereby, each said wire 10a is mutually connected by the bone wire 10b, the endless belt 10 becomes bendable in the front-back direction along the bone wire 10b, and has water permeability in the front-back direction. As shown in FIGS. 2 to 4, a chain 38 that meshes with each of the sprockets 15 is provided on both side edges in the width direction W of the endless belt 10.

  As shown in FIG. 1, the side frame 13 is provided with a cleaning device 40 that cleans the endless belt 10 by spraying cleaning water onto the back surface of the endless belt 10 on the return track 24. Further, the gantry 17 is provided with a discharge unit (not shown) for collecting and discharging the desorbed water dropped from the endless belt 10 by gravity filtering the sludge 3 to be concentrated.

Hereinafter, the operation of the above configuration will be described.
By rotating the terminal roller 8 with the motor 7, the remaining rollers 6 and 9 and the sprockets 15 rotate, and the endless belt 10 rotates in one direction. Then, after adding a flocculant to the concentration target sludge 3 for aggregation, the concentration target sludge 3 is supplied from the sludge supply unit 2 onto the endless belt 10. Thereby, the concentration target sludge 3 is gravity filtered while being transported on the transport track 23, and then discharged from the sludge discharge unit 4.

  At this time, as shown in FIG. 7, the concentration target sludge 3 is dehydrated to some extent in the horizontal portion 23a of the transport track 23, and then rolls the surface of the endless belt 10 toward the sludge discharge portion 4 in the inclined portion 23b. While falling, it becomes a plurality of lumps B and is aggregated. Thereby, dehydration is promoted in the inclined portion 23b, the filtration efficiency of the belt type concentrator 1 is improved, and the concentrated concentration of the discharged sludge 3 is increased.

  In addition, since the sludge 3 to be concentrated is once peeled upward from the surface of the endless belt 10 by the first scraper 31 at the start end portion of the inclined portion 23b, the surface of the endless belt 10 is a new surface to which the sludge 3 is not attached. Updated to Thereby, dehydration is further promoted in the inclined portion 23b, and the filtration efficiency of the belt type concentrator 1 is further improved. The separated sludge 3 to be concentrated gets over the upper surface of the first scraper 31 and falls onto the endless belt 10 of the inclined portion 23b.

  Further, the sludge 3 adhering to the surface of the endless belt 10 at the inclined portion 23 b is peeled off from the endless belt 10 by the second scraper 33 and discharged from the sludge discharge portion 4. Thereby, since the surface of the endless belt 10 after discharging the sludge 3 is renewed to a new surface, it is possible to prevent a decrease in filtration efficiency due to the adhesion of the sludge 3, and the concentrated concentration of the discharged sludge 3 Is maintained well over a long period of time.

  In the said 1st Embodiment, although the 1st scraper 31 was used as an example of a 1st peeling means, a wire etc. are stretched in the width direction W of the endless belt 10, and the concentration object sludge 3 is endless with this wire. The belt 10 may be peeled off from the surface.

  In the first embodiment, as shown in FIG. 7, the start roller 6 and the intermediate roller 9 are arranged at the same height, and the end roller 8 is arranged below the both rollers 6, 9. However, as a second embodiment, as shown in FIG. 8, the start roller 6 and the end roller 8 are arranged at the same height, and the intermediate roller 9 is arranged above the rollers 6 and 8. Furthermore, a pair of left and right presser rollers 45 that press the both end portions of the endless belt 10 from above and bend the endless belt 10 are added, and an upward slope is provided between the horizontal portion 23a and the downward slope portion 23b. The portion 23c may be formed.

  In the first embodiment, as shown in FIG. 7, the inclined portion 23b is formed from the rear side (downstream side) of the horizontal portion 23a to the sludge discharge portion 4, and the concentration target sludge 3 is inclined from the horizontal portion 23a to the inclined portion. Although it is configured to be discharged to the sludge discharge part 4 through 23b, as shown in FIG. 9, as the third embodiment, a downwardly inclined part 23b is formed in the middle of the horizontal part 23a, You may comprise so that the concentration object sludge 3 may be discharged | emitted from the horizontal part 23a of a start end side to the sludge discharge part 4 from the horizontal part 23a of a termination | terminus side through the inclined part 23b.

  In the first embodiment, as shown in FIG. 7, the single endless belt 10 forms the horizontal portion 23a and the inclined portion 23b. However, the fourth embodiment is shown in FIG. As described above, the horizontal portion 23a and the inclined portion 23b of the transport track 23 may be formed by the two endless belts 10A and 10B. That is, one endless belt 10A is stretched between a pair of start roller 6 and end roller 8 to form a horizontal portion 23a and between a pair of rollers 46 and 47 in which the other endless belt 10B is provided separately. Is inclined to form an inclined portion 23b.

  The terminal roller 8 and the roller 47 are rotationally driven in opposite directions by a motor (not shown). Each roller 6, 8, 46, 47 is rotatably supported between the pair of left and right side frames 13 as in the first embodiment. The endless belts 10A and 10B are belts having the same structure as the endless belt 10 of the first embodiment, and have chains 38 on both sides.

  A first scraper 48 is provided on the terminal end side of the horizontal portion 23a to separate the sludge 3 to be concentrated from the surface of one endless belt 10A and discharge it onto the other endless belt 10B. In addition, the sludge discharger 4 is provided with a second scraper 49 that separates the concentration target sludge 3 from the surface of the other endless belt 10B.

  According to this, when the terminal roller 8 and the roller 47 are rotationally driven by a motor (not shown), one endless belt 10A is rotated in one direction, and the other endless belt 10B is one endless belt. It rotates in the opposite direction to 10A.

  Then, the concentration target sludge 3 supplied from the sludge supply unit 2 onto one endless belt 10A is dehydrated to some extent in the horizontal portion 23a of the transport track 23, and then from one endless belt 10A to the other endless belt 10B. It is discharged upward, and in the inclined portion 23b, the surface of the other endless belt 10B rolls down toward the sludge discharging portion 4 and is aggregated into a plurality of lumps B. Thereby, dehydration is promoted in the inclined portion 23b, the filtration efficiency of the belt type concentrator 50 is improved, and the concentrated concentration of the discharged sludge 3 is increased.

  At this time, since the other endless belt 10B moves from the bottom to the top with respect to the sludge 3 to be dropped at the inclined portion 23b, the sludge 3 easily rolls and the aggregation of the sludge 3 is promoted.

  Further, since the concentration target sludge 3 attached to the surface of one endless belt 10A is peeled off by the first scraper 48, the surface of one endless belt 10A is updated to a new surface. Similarly, since the concentration target sludge 3 attached to the surface of the other endless belt 10B is peeled off by the second scraper 49, the surface of the other endless belt 10B is updated to a new surface. Thereby, the fall of the filtration efficiency by adhesion of the sludge 3 can be prevented.

It is a side view of the belt type concentration machine in a 1st embodiment of the present invention. It is a top view of a belt type concentrator. It is a figure which shows the structure of the attachment part of the start end roller of a belt type concentrator. It is a figure which shows the structure of the attachment part of the intermediate | middle roller and terminal roller of a belt type concentrator. FIG. 3 is an enlarged plan view showing the configuration of an endless belt of the belt type concentrator. It is a XX arrow line view in FIG. It is the schematic side view which showed a mode that sludge was spin-dry | dehydrated and concentrated by the belt-type concentrator. It is a schematic side view of the belt type concentrator in the 2nd Embodiment of this invention. It is a schematic side view of the belt type concentrator in the 3rd Embodiment of this invention. It is a schematic side view of the belt type concentrator in the 4th Embodiment of this invention. It is a schematic side view of the conventional belt type concentrator. It is a figure of the shooter provided in the sludge discharge part of the belt type concentration machine.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Belt type concentrator 2 Sludge supply part 3 Concentration object sludge 4 Sludge discharge part 10 Endless belt 23 Conveying track 23b Inclination part 31 1st scraper (1st peeling means)
33 Second scraper (second peeling means)

Claims (3)

A belt-type concentrator that filters the sludge to be concentrated while conveying it with an endless belt by rotating an endless belt having water permeability,
A part of the transport track for transporting the concentration target sludge from the sludge supply section to the sludge discharge section with an endless belt is formed with a downwardly inclined slope portion for rolling down the concentration target sludge on the endless belt in the transport direction. A belt-type concentrator. A first stripping means is provided at the start end of the inclined portion, wherein first concentration means is provided for once removing the sludge to be concentrated conveyed by the endless belt from the endless belt and then returning it to the endless belt of the inclined portion. Item 2. A belt type concentrator according to Item 1. The inclined portion is formed from a midpoint of the conveying track to a sludge discharge portion, and the sludge discharge portion is provided with a second peeling means for peeling the sludge to be concentrated from the endless belt. The belt type concentrator according to claim 2.

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