JP2000254693A - Treatment and treating equipment for sludge - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a treating method and device for sludge, which is capable of remarkably reducing the quantity of quick lime to be used, taking out ballast or sand contained in the sludge and having high commercial value from the sludge to increase economies. SOLUTION: This sludge 13 containing the ballast 11 and the sand 12 is sifted 15 to be separated into the sludge 13 containing the ballast 11 as an over screen portion and the sludge 13 containing the sand as a under screen portion. After the separation of the ballast 11, the sludge 13 containing the sand 12 is charged into water and stirred to separate the sand 12 from the sludge 13. After the sand 12 is separated, the sludge 13 is settled from the water 21 containing the sludge 13, the sludge water 23 containing the large quantity of the settled sludge 13 is taken out, the sludge 13 is precipitated by adding a flocculant 29 and the precipitated sludge 13 is dehydrated. The sludge 13 after the dehydration is solidified by adding quick lime 35 and used as regenerated aggregate 37.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sludge treatment method and a sludge which can produce recycled aggregate from sludge containing ballas and sand (so-called sludge), and can separate ballas and sand to be used as a recycled material. Regarding processing equipment.

[0002]

2. Description of the Related Art Sludge containing ballast and sand is mainly used as an embankment material by adding quicklime directly to sludge.

[0003]

However, such a sludge treatment method still has the following problems to be solved.
That is, since such sludge generally has a high water content, that is, contains a large amount of water, it is necessary to add a large amount of quicklime to the sludge in order to be solidified and used as recycled aggregate. Requires a lot of expense. In addition, although sludge contains ballas and sands having high commercial value as recycled aggregate, it is used only as embankment material having low commercial value while containing these inside. in this way,
Conventional sludge treatment methods have not been used effectively.

[0004] The present invention has been made in view of such circumstances, and it is possible to significantly reduce the amount of quicklime used and to remove bals and sand of high commercial value contained in sludge from the sludge. It is an object of the present invention to provide a sludge treatment method and a sludge treatment facility capable of improving the economic efficiency.

[0005]

According to a first aspect of the present invention, there is provided a method for treating sludge, comprising the steps of:
Remove the ballast by sieving, and separate the sand with sludge containing sand from which the ballast has been removed by a wet classifier using water,
The classified sludge is concentrated and further dewatered to dehydrated sludge, and quicklime is added to the dehydrated sludge to solidify, and the solidified sludge is crushed as necessary to be used as recycled aggregate, and the separated ballast and sand are separated. Is used as a resource. Further, a sludge treatment method according to a second invention which meets the above object,
The first step of sieving the sludge containing sand and ballas to separate the sludge containing sand as the upper part of the sieve and the ballas as the upper part of the sieve, and the sludge containing the sand separated in the first step A second step of throwing into water and stirring to separate sand, a third step of putting water containing the sludge from which the sand has been separated in the second step into a settling tank to precipitate the contained sludge, A fourth step of taking out sludge water containing a large amount of sludge precipitated in the three steps, adding a flocculant to the sludge water to precipitate the sludge contained therein, and dehydrating the precipitated sludge, and a dehydration treatment in the fourth step A fifth step is provided in which quicklime is added to the sludge to be solidified and then crushed if necessary to be used as recycled aggregate.

As described above, in the sludge treatment method according to the present invention, first, ballast and sand having high commercial value are separated from the sludge using a sieve and water. Then, after adding a flocculant to the sludge to precipitate and dehydrate it to sufficiently reduce the water content, and then adding quicklime, the amount of quicklime used can be significantly reduced, thereby reducing costs. be able to. In addition, as a pre-step of adding the flocculant to the sludge, the sludge is precipitated from water containing the sludge and the sludge concentration is increased, so that when the sludge is precipitated using the flocculant, the amount of the flocculant used can be reduced. .

[0007] Next, a sludge treatment facility according to a third aspect of the present invention, which meets the above object, comprises a rotary sieve provided with a sludge inflow opening at one end for flowing in sludge containing sand and ballads, A classifier that separates sand from the sludge containing sand, which is a fraction under the sieve, a sludge concentration unit that concentrates water containing the sludge separated by the classifier, and a sludge concentrated by the sludge concentration unit. It has a dewatering device for dewatering, and a solidifying device for adding quicklime to the sludge dewatered by the dewatering device and solidifying it. Here, in the third invention,
The sludge concentration means receives a sludge tank containing sludge water from which sand has been removed from the classifier, and receives sludge water containing settled sludge from the settling tank, and further includes a flocculant to further sediment the sludge contained therein. It is also possible to have a thickener to concentrate. Further, the rotary sieve, the classifier,
The settling tank, the thickener, the dewatering device, and the solidifying device may be divided into a plurality of groups, and each group may be mounted on two or three carriers. In this case, since all the devices required for sludge treatment are mounted on two or three transport vehicles, the mobility of the sludge treatment equipment can be increased, and the sludge treatment can be performed directly at various sites where sludge is generated. Sludge treatment can be performed quickly and accurately.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the accompanying drawings to provide an understanding of the present invention.

First, referring to a flow sheet shown in FIG. 1, a sludge treatment facility 1 used in a sludge treatment method according to the present invention.
0 will be described. As shown in the figure, below the hopper 14 to which the sludge 13 including the ballast 11 and the sand 12 is supplied from a sludge source (not shown), the ballast 1
A rotary sieve (trommel) 15 which is an example of a sieve for separating 1 is provided.

The rotary sieve 15 is disposed in the frame 17 with the sludge inflow opening 16 inclined upward. In addition, in the frame 17, below the wet rotary screen 15 using water, the sludge 13 containing the sand 12 and the sand 12 and the sludge 13 are contained using water in a vertically polymerized state. Classifier 18 that separates wastewater 21 (ie, sludge water)
Are arranged. At a position adjacent to the frame 17, a ballast discharge conveyor 19 for taking out the ballast 11 separated from the rotary screen 15 to the outside, and a classifier 18
A sand discharge conveyor 20 for taking out the sand 12 separated from the outside is provided.

A settling tank 22 for temporarily storing the water 21 containing the sludge 13 and settling the sludge 13 is provided downstream of the classifier 18. Then, in the vicinity of the settling tank 22, the settled sludge is mixed with water and sludge water 23.
First and second thickeners 24, 24a to be described later.
A sludge transfer pump 25 for transferring the sludge to the classifier 18 is provided inside the settling tank 22. The settling tank 22 and the first and second thickeners 24 and 24a constitute sludge thickening means.

By driving a coagulant supply pump 30 downstream of the settling tank 22,
Coagulant 29 is added to sludge water 23, and first and second thickeners 24 and 24a for precipitating and condensing sludge 13
Are arranged. First and second thickeners 24, 24
A centrifugal separator 32, which is an example of a dewatering device for dewatering the precipitated and concentrated sludge 13 transferred by the sludge transfer pump 31, is provided downstream of a. On the downstream side of the centrifugal separator 32, solidification is performed by adding quicklime 35 from the quicklime hopper 34 to the dewatered sludge 13 (dewatered sludge) via the sludge transfer pump 32 a from the centrifuge 32 to solidify the sludge 13. A device 36 is provided. The solid sludge solidified by the solidifying device 36 is carried out as recycled aggregate 37 to the outside via an aggregate carry-out conveyor 38.

The other structure of the flow sheet shown in FIG. 1 will be described. A water storage tank 40 for supplying cleaning water 40a to the hopper 14 via a cleaning water transfer pump 39 is provided near the hopper 14. The supernatant water 41 in the first and second thickeners 24 and 24a and the water 42 dehydrated by the centrifugal separator 32 are supplied to the water storage tank 40.

Next, a sludge treatment method using the sludge treatment equipment 10 having the above-described configuration will be described with reference to FIG. (1) First, a sludge 13 containing a ballast 11 and sand 12 is put into a rotary sieve 15 that is rotationally driven from a hopper 14, and a ballast 11 as an upper portion of the sieve and a sand 1 as a lower portion of the sieve.
Separated into sludge 13 containing 2. And ballas 11
Is carried out to the outside using the ballast carry-out conveyor 19. (2) Sludge 1 containing sand 12 after separating ballast 11
3 is put into the water of a classifier 18 and stirred to separate the sand 12 from the sludge 13. Specifically, the classifier 18 is attached to the inclined screw feeder 50 rotatably disposed in the inclined trough 49 and the bottom plate of the inclined trough 49, as described later with reference to FIGS. A plurality of water injection nozzles 51 are provided.
The washing water is sprayed on the sludge 13 containing water, the light sludge 13 is separated from the heavy sand 12 and floated in the water, and the inclined screw feeder 50 is driven to drive the sand 12
Is transported upward along the bottom plate of the inclined trough 49, dropped on the sand discharge conveyor 20, and then discharged outside.

(3) After separating the sand 12, the water 21 containing the sludge 13 is temporarily stored in the settling tank 22 and
3 is settled, and sludge water 23 containing a large amount of settled sludge 13 (settled sludge) is first and second thickeners 24, 24.
Transfer to a. (4) In the first and second thickeners 24 and 24a,
The flocculant 29 is added to the sludge water 23 to precipitate and concentrate the sludge 13. (5) The precipitated sludge 13 is transferred to the centrifugal separator 32 and dewatered. (6) The dewatered sludge 13 is transferred to a solidifying device 36, solidified by adding quicklime 35, and crushed if necessary, to produce a recycled aggregate 37.

As described above, in the sludge treatment method according to the present invention, first, the ballast 11 and the sand 12 having high commercial value are separated from the sludge 13 by using the rotary sieve 15 and the wet classifier 18. Thereafter, a flocculant 29 is added to the concentrated sludge water 23 to precipitate the precipitate, and the water content is sufficiently reduced by dehydration with a centrifuge 32. Then, the quicklime 35 is added. The amount of use can be significantly reduced, and costs can be reduced. Further, the ballast 11 and the sand 12 having a high commercial value contained in the sludge 13 can be selected from the sludge 13 to improve the economic efficiency. Furthermore, in the present embodiment, the sludge water 23 containing a large amount of the sludge 13 settled in the settling tank 22 has a high sludge concentration, so
When the sludge 13 is precipitated using the coagulant 29 in the thickeners 24 and 24a, the amount of the coagulant 29 used can be reduced as compared with the case where the sedimentation tank 22 is not used.

[0017]

Next, the configuration of the above-mentioned sludge treatment equipment 10 will be described.
This will be specifically described with reference to FIGS. 2 and 3
As shown in the figure, a frame 17 composed of a rectangular frame is placed on a loading platform 44 of a first transporting vehicle 43 composed of a truck, and a rotating sieve 15 and a classifier 18
Are mounted in an inclined state and partially in a superposed state. At the downstream end of the rotary sieve 15, a drive motor 45 for rotating and driving the rotary sieve 15 and a ballast discharge cylinder 46 are arranged. On the other hand, a sludge outflow opening 47 is provided on the bottom surface on the upstream side of the rotary sieve 15.
8 is communicatively connected. In FIG. 2, the sludge outflow opening 47 is provided over substantially the entire length of the rotary sieve 15. However, except for the downstream portion of the rotary sieve 15 and the ballast discharge cylinder 46, a guide trough is provided on the lower surface thereof and the rotary sieve 15 is provided. It is also possible to adopt a configuration in which the sludge 13 flows into the classifier 18 from only the downstream portion of the sludge 13. In this case, the washing water can be effectively jetted to the sludge 13 from a plurality of water jet nozzles 51 described later to increase the separation efficiency of the sand 12.

The classifier 18 includes an inclined trough 49 having a U-shaped cross section, an inclined screw feeder 50 rotatably arranged in the inclined trough 49, and a plurality of inclined troughs 49 attached to an upstream portion of a bottom plate of the inclined trough 49. A water injection nozzle 51,
A cleaning water injection nozzle 52 is provided at the downstream end (i.e., diagonally upper portion) of the inclined trough 49. A sprocket 54 is fixed to an end of a feeder shaft 53 projecting from a downstream end of the inclined screw feeder 50. The sprocket 54 is composed of a sprocket 56 attached to an output shaft of a drive motor 55 and an endless chain 57. Are in communication with each other. On the downstream side of the bottom plate of the inclined trough 49, a sand discharge cylinder 58 and a sludge discharge cylinder 59 are attached in a state of being juxtaposed in the axial direction. An upstream side of the sand discharge conveyor 20 is disposed below the sand discharge tube 58, and a lower portion of the sludge discharge tube 59 is connected to the settling tank 22.

With such a configuration, a pressure pump (not shown) is driven to inject stirring water from the water injection nozzle 51 into the sludge 13 containing the sand 12 to stir / separate the light sludge 13 from the heavy sand 12. And drives the inclined screw feeder 50 by operating the drive motor 55 to transfer the sand 12 upward along the bottom plate of the inclined trough 49 and drop the sand 12 onto the sand carry-out conveyor 20, and Can be carried out. Further, when the amount of the sand 12 to be carried out is small, there is a possibility that fine particles may be mixed into the sand 12 to some extent.

As shown in FIGS. 4 and 5, the first and second thickeners 24, 24a are spaced apart from each other on a carrier 59b of a second truck 59a composed of a truck.
, A coagulant tank 28 and a generator 29 are mounted. As shown in FIGS. 4 to 6, the first and second thickeners 24 and 24a have substantially the same configuration except that they are symmetric. That is, the first and second thickeners 24 and 24a are respectively provided in cylindrical tanks 60 and 60a having a conical bottom, and stirring blades 61 and 61a rotatably disposed in the cylindrical tanks 60 and 60a. Tank 6
Sludge outflow guide cylinders 63, 63 held in a state fixed by fixing ribs 62, 62a at the center of 0, 60a.
a, sludge supply branch pipes 64, 64a for supplying sludge water 23 containing settled sludge from the settling tank 22 to the sludge outflow guide cylinders 63, 63a, and rotating mechanisms 65, 65a for rotating the stirring blades 61, 61a. Have been.

Also, first and second thickeners 24, 24
a has a settling sludge outlet 66 at the center of the conical bottom,
66a, and a supernatant water extraction trough 67, 67a and a supernatant water extraction pipe 68, 68a at the upper part thereof. Further, as shown in FIGS. 5 and 6, the upstream ends of the sludge supply branches 64, 64a are cylindrical tanks 60, 60.
Each of the sludge supply pipes 69 is connected to the outside of the sludge supply pipe 69 via a valve. The upstream end of the communication connection portion is connected to the downstream end of a sludge supply pipe 69 connected to the settling tank 22. The downstream end of the coagulant supply pipe 70 is connected to the downstream side of the sludge supply pipe 69,
The upstream end of the coagulant supply pipe 70 is connected to the coagulant tank 28. The settled sludge outlets 66 and 66a are connected to the upstream side of the sludge transfer pipe 71, and the downstream side of the sludge transfer pipe 71 is connected to the centrifugal separator 32. The upstream ends of the supernatant water discharge pipes 68 and 68a are connected and connected outside the cylindrical tanks 60 and 60a, and the downstream ends of the supernatant water return pipe 72 connected and connected to the water storage tank 40. It is communicatively connected to the upstream end.

With the above configuration, the sludge supply pipe 69
After the coagulant 29 is added to the sludge water 23 supplied from the bottom of the settling tank 22 through the coagulant supply pipe 70, the sludge supply branch pipes 64, 64a and the sludge outflow guide cylinders 63, 63a pass through the cylindrical tank 60, The sludge 13 can be easily and quickly aggregated by flowing down into the cylindrical tanks 60, 60a radially from the central portion of the 60a and stirring by the stirring blades 61, 61a, thereby promoting the sedimentation. it can. Then, the sludge 13 settled at the bottom of the cylindrical tanks 60 and 60a can be transferred to the centrifugal separator 32 through the sludge transfer pipe 71.

As shown in FIG. 7, a third track
The solidifying device 36 having the quicklime hopper 34 and the centrifugal separator 32 are mounted on the carrier 74 of the transport vehicle 73 at intervals in the vehicle length direction. As described above, in this embodiment, all the devices required for sludge treatment are the first to third transport vehicles 4.
3, 59a, 73, the mobility of the sludge treatment equipment 10 can be enhanced, and sludge treatment can be performed quickly and accurately by going directly to various sites where various sludges 13 are generated. .

8 to 11 show a sludge treatment facility 75 according to a modification of the sludge treatment facility 10 according to the above-described embodiment and example. Substantially, sludge treatment equipment 75
Has substantially the same configuration as the sludge treatment facility 10 according to the above-described embodiment and example, except for the following configuration. Therefore, the same components are denoted by the same reference numerals.

As shown in FIG. 8, the sludge treatment equipment 75 according to the present modification does not directly transfer the supernatant water 41 in the first and second thickeners 24, 24a to the water storage tank 40, but temporarily removes the supernatant water. Transfer to tank 76. afterwards,
The supernatant water 77 is transferred to the water storage tank 40 to increase the effective use of water and the circulation efficiency.

As shown in FIG. 8, the centrifuge 32
Is transferred to a filtration tank 79, and the supernatant water 80 obtained in the filtration tank 79 is transferred to a supernatant water transfer pump 8
1 is operated and transferred to the first and second thickeners 24 and 24a to circulate water.

As shown in FIG. 8, a stirring tank 82 is provided between the centrifugal separator 32 and the solidifying device 36. The dewatered sludge 13 is once transferred to the stirring tank 82 by the centrifugal separator 32, and the sludge can be supplied to the solidifying device 36 using the sludge pump 83. Therefore, the sludge can be supplied stably and efficiently reacts with quicklime.

As shown in FIGS. 9 and 10, in this modification, only the first thickener 24 is used, so that the loading platform 59 of the second transport vehicle 59a composed of a truck is used.
b, a first thickener 24, a coagulant tank 28,
In addition to the generator 29, a centrifuge 32 and a supernatant tank 76 can also be mounted. Further, as shown in FIG. 11, in the present modification, a third carrier 7 composed of a truck is used.
The solidifying device 36 having the quicklime hopper 34 and the stirring tank 82 can be mounted on the third carrier 74 at intervals in the vehicle length direction.

As described above, the present invention has been described with reference to one embodiment. However, the present invention is not limited to the configuration described in the above embodiment, and is described in the claims. It also includes other embodiments and modifications that can be considered within the scope of the matters described. For example, the sludge treatment method and sludge treatment equipment according to the present invention can be suitably used for ready-mixed concrete sludge generated at a ready-mixed concrete factory, construction sludge generated at a construction site, and the like.

[0030]

In the sludge treatment method according to the first and second aspects and the sludge treatment equipment according to the third to fifth aspects, ballast and sand having high commercial value are separated from the sludge using a sieve and water. After adding a flocculant to the sludge for precipitation and dehydration to sufficiently reduce the water content, the quicklime is added, so that the economic efficiency can be improved and the amount of quicklime used can be greatly reduced, and the cost can be reduced. Reduction can be achieved. When the flocculant is used to concentrate the sludge, the sludge is settled to increase the sludge concentration. Therefore, when the sludge is precipitated using the flocculant, the amount of the flocculant used can be reduced. And, in the sludge treatment equipment, when all the devices required for the sludge treatment are mounted on two or three carriers, the mobility of the sludge treatment equipment can be enhanced, and various kinds of sludge generating various kinds of sludge can be obtained. The sludge treatment can be performed quickly and accurately by going directly to the site.

[Brief description of the drawings]

FIG. 1 is a flow sheet of a sludge treatment method and a sludge treatment facility according to an embodiment of the present invention.

FIG. 2 is a side view of a first carrier used for the sludge treatment facility and various devices mounted on the carrier according to the embodiment of the present invention.

FIG. 3 is a plan view of a first carrier used in the sludge treatment facility according to one embodiment of the present invention and various devices mounted on the carrier.

FIG. 4 is a side view of a second carrier used in the sludge treatment facility according to the embodiment of the present invention and various devices mounted on the carrier.

FIG. 5 is a plan view of a second carrier used for the sludge treatment facility and various devices mounted on the carrier according to the embodiment of the present invention.

FIG. 6 is a cross-sectional side view of a thickener mounted on a second carrier used in the sludge treatment facility according to one embodiment of the present invention.

FIG. 7 is a side view of a third carrier used in the sludge treatment facility according to the embodiment of the present invention and various devices mounted on the carrier.

FIG. 8 is a flow sheet of a sludge treatment facility according to a modification of the embodiment of the present invention.

FIG. 9 is a side view of a second carrier used for sludge treatment equipment and various devices mounted on the carrier according to a modification of the embodiment of the present invention.

FIG. 10 is a plan view of the same.

FIG. 11 is a side view of a third transport vehicle used for sludge treatment equipment and various devices mounted on the transport vehicle according to a modification of the embodiment of the present invention.

[Explanation of symbols]

10: sludge treatment equipment, 11: ballast, 12: sand, 13:
Sludge, 14: Hopper, 15: Rotating sieve, 16: Sludge inflow opening, 17: Frame, 18: Classifier, 19: Ballast discharge conveyor, 20: Sand discharge conveyor, 21: Water containing sludge, 22: Settling tank , 23: sludge water, 24: first thickener, 24a: second thickener, 25: sludge transfer pump, 26: supernatant water, 27: supernatant water transfer pump, 28: flocculant tank, 29: flocculant, 31 : Sludge transfer pump, 32: centrifugal separator, 32a: sludge transfer pump, 34: quicklime hopper, 35: quicklime, 36: solidifying device, 37: recycled aggregate, 38: aggregate transport conveyor, 3
9: wash water transfer pump, 40: water storage tank, 40a: wash water, 41: supernatant water, 42: dehydrated water, 43: first
Transport vehicle, 44: bed, 45: drive motor, 46: ballast discharge cylinder, 47: sludge outflow opening, 48: sludge inflow cylinder,
49: Inclined trough, 50: Inclined screw feeder, 5
1: water injection nozzle, 52: washing water injection nozzle, 53: feeder shaft, 54: sprocket, 55: drive motor, 5
6: sprocket, 57: endless chain, 58: sand discharge tube, 59: sludge discharge tube, 59a, second carrier, 59
b: bed, 60: cylindrical tank, 60a: cylindrical tank, 6
1: stirring blade, 61a: stirring blade, 62: fixed rib, 6
2a: fixed rib, 63: sludge outflow guide tube, 63a: sludge outflow guide tube, 64: sludge supply branch, 64a: sludge supply branch, 65: rotating mechanism, 65a: rotating mechanism, 66: settled sludge outlet, 66a: Precipitated sludge outlet, 67: supernatant water extraction trough, 67a: supernatant water extraction trough, 68: supernatant water extraction pipe, 68a: supernatant water extraction pipe, 69: sludge supply pipe, 70: flocculant supply pipe, 71: sludge transfer Piping,
72: supernatant water return pipe, 73: third carrier, 74:
Loading bed, 75: sludge treatment equipment, 76: supernatant tank, 7
7: supernatant water, 78: water, 79: filtration tank, 80: supernatant water, 81: supernatant water transfer pump, 82: stirring tank, 8
3: Sludge pump

Claims (5)

[Claims] 1. A sludge containing sand and ballast is sieved to remove the ballast, and the sludge containing sand from which the ballast has been removed is separated from the sand by a wet classifier using water, and the classified sludge is concentrated. Further, dewatering is performed to make dewatered sludge, quicklime is put into the dewatered sludge and solidified, and the solidified sludge is crushed and used as a recycled aggregate if necessary, and the separated ballas and sand are used as resources. Sludge treatment method characterized by the above-mentioned. 2. A first step in which a sludge containing sand and ballast is sieved and separated into a ballast as an upper part of the sieve and a sludge containing sand as a lower part of the sieve, and the sand separated in the first step. A second step of introducing the sludge containing water into the water and stirring to separate the sand; and a step of placing the water containing the sludge from which the sand has been separated in the second step into a settling tank to precipitate the contained sludge. Three steps,
A fourth step of taking out sludge water containing a large amount of sludge precipitated in the third step, adding a flocculant to the sludge water to precipitate sludge contained therein, and dehydrating the precipitated sludge; Fifth, which is solidified by adding quicklime to the treated sludge and crushed if necessary to be used as recycled aggregate
A sludge treatment method comprising a step. 3. A rotary sieve having a sludge inflow opening for inflow of sludge containing sand and ballast at one end, and separating the sand from the sludge containing sand, which is a portion below the rotary sieve. A classifier, a sludge concentrating means for condensing the water containing the sludge separated by the classifier, a dewatering device for further dewatering the sludge condensed by the sludge concentrating means, and quicklime to the sludge dewatered by the dewatering device. And a solidifying device for solidifying the sludge by adding the sludge. 4. The sludge treatment facility according to claim 3,
The sludge concentration means receives a sludge tank containing sludge water from which sand has been removed from the classifier, and receives sludge water containing settled sludge from the settling tank, and further includes a flocculant to further sediment the sludge contained therein. -Sludge treatment equipment characterized by having a thickener for thickening. 5. The sludge treatment facility according to claim 4,
The rotary sieve, the classifier, the settling tank, the thickener, the dewatering device, and the solidifying device are divided into a plurality of groups, and each group is mounted on two or three carriers. And sludge treatment equipment.