JP2003311298A - Sludge treating apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus and a system for treating sludge by which an improved soil product of stable quality can be produced by using various kinds of sludge as a raw material. <P>SOLUTION: The sludge treating apparatus 600 which produces improved soil by blending received sludge with a solidifying material is provided with a housing 601 in which an entrance 602 of the sludge and of the solidifying material and an exit 603 of the improved soil are provided respectively at one side and at another side in a longitudinal direction, a first water content ratio detecting means 611 which is installed near the entrance 602 and detects water content ratio of the unimproved sludge and a second water content ratio detecting means 612 which is installed at a lower position in the housing 601 and detects water content ratio of a mixture composed of improving sludge and the solidifying material. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sludge treatment device for mixing and reforming mud (construction soil) generated in, for example, shield work with a solidifying material, and more particularly to feedback controlling the amount of the solidifying material supplied. The present invention relates to a sludge treatment device capable of producing a modified sediment product with stable quality.

[0002]

2. Description of the Related Art Conventionally, sludge treatment has been performed in which sludge generated by, for example, shield work is mixed with a solidifying material to be reformed into a modified earth and sand product that can be reused as, for example, backfill soil. The sludge treatment system used for this sludge treatment generally includes a sludge supply device that receives the sludge to be reformed and supplies it in a substantially constant amount, and a solidification material supply device that supplies a solidified material that solidifies the sludge in a substantially constant amount. And a sludge treatment device that mixes the supplied sludge and the solidifying material to generate modified earth and sand. As such a sludge treatment system,
For example, a reformer for excavated soil described in Japanese Utility Model Publication No. 3-128791 has been already proposed.

In the above-mentioned prior art, sludge (excavated soil) is directly pumped up from the starting shaft in the shield construction and is guided to the sludge treatment device. This sludge treatment device uses a so-called screw mixer, and the solidification material is supplied from the solidification material supply device on the upstream side of the sludge transfer direction in the housing. Further, in this conventional technique, a water content ratio sensor for detecting the water content ratio of the sludge supplied to the sludge inlet portion of the housing is provided, and the water content ratio of the sludge before reforming is provided by the detection signal of the water content ratio sensor. Is detected. Then, the control means calculates the required solidifying material supply amount based on the detection signal of the water content ratio sensor, and outputs a command signal to the solidifying material supply device.

[0004]

In the above prior art, a water content ratio sensor for the modified earth and sand is provided at the modified earth and sand outlet of the housing, and the water content ratio of the generated modified earth and sand (reformed sludge) is increased. There is also disclosed a configuration in which the supply amount of the solidifying material is feedback-controlled based on the detection signal of. However, the sludge transfer speed in this type of sludge treatment device is relatively slow, and it takes time for the sludge supplied from the inlet to be reformed and discharged from the outlet. That is, it takes a relatively long time for the sludge whose water content is detected near the inlet to be detected again near the outlet after being reformed. Therefore, a relatively large time lag occurs in the feedback control of the solidifying material supply amount performed by the above-mentioned conventional technique. As a result, the water content of the supplied sludge may have already changed at the time when the solidifying material supply amount is corrected, and the quality of the modified earth and sand product may vary.

The present invention has been made in view of the above matters, and an object thereof is to provide a sludge treatment apparatus capable of producing a modified earth and sand product of stable quality from various sludges as raw materials. .

[0006]

[Means for Solving the Problems] (1) In order to achieve the above object, the present invention relates to a sludge treatment apparatus which mixes a solidifying material with sludge to produce modified earth and sand. A cylindrical housing that stirs while rotating, a sludge introducing pipe and a solidifying material introducing pipe introduced into the housing from a wall surface on one longitudinal side of the housing, and a wall surface on the other longitudinal side of the housing A mixing device having a screw conveyor for carrying out reformed sediment discharged to the outside of the housing, a first water content ratio detection means provided in the sludge introduction pipe line for detecting the water content ratio of sludge before reforming, and A second water content ratio detecting means provided in the housing for detecting the water content ratio of the sludge in the middle of reforming mixed with the solidifying material;
Based on the detection signals of the solidification material supply means for supplying the solidification material to the solidification material introduction pipe, the first water content ratio detection means, and the second water content ratio detection means, the solidification material is supplied by the solidification material supply means. Control means for transmitting a control signal for controlling the supply amount of the solidification material to the solidifying material supply means.

(2) In order to achieve the above-mentioned object, the present invention is a sludge treatment device in which a sludge is mixed with a solidifying material to obtain modified earth and sand, and a housing, from one longitudinal side of the housing to the inside of the housing. A sludge introducing pipe and a solidifying material introducing pipe introduced into the housing, a modified sediment carrying-out opening provided on the other side in the longitudinal direction of the housing, a mixing device having a stirring means provided in the housing, and the sludge introducing First in the pipeline to detect the water content of sludge before reforming
Water content ratio detecting means, second water content ratio detecting means provided in the housing for detecting the water content ratio of sludge in the middle of reforming mixed with the solidifying material, and the solidifying material in the solidifying material introducing pipe line. A control signal for controlling the supply amount of the solidifying material by the solidifying material supplying means, based on the detection signals of the solidifying material supplying means, the first water content ratio detecting means, and the second water content ratio detecting means. Is transmitted to the solidifying material supplying means.

In the above (1) or (2), the second water content ratio detecting means is provided in the housing of the mixing device, and the sludge and the sludge being reformed in the housing by the second water content ratio detecting means. Detect the water content of the solidifying material mixture.
Further, a first water content ratio detecting means is provided in the sludge introducing pipe of the housing to detect the water content ratio of the supplied sludge. With such a configuration, by the control means,
Based on the detection signal of the first water content ratio detecting means, the water content ratio of the sludge before reforming can be calculated, and the solidifying material supply amount can be determined accordingly. At the same time, the water content ratio of the contents (mixture of sludge and solidifying material) of the housing being reformed is calculated based on the detection signal of the second water content ratio detection means, and the calculation result is set in a suitable predetermined range. By comparing with, it becomes possible to correct the solidifying material supply amount.

Here, in the present invention, since the second water content ratio detecting means is provided in the housing, the distance between the second water content ratio detecting means and the first water content ratio detecting means becomes shorter than that of the above-mentioned prior art. . That is, it is possible to shorten the time required for the sludge having the water content ratio detected by the first detection unit to be detected by the second water content ratio detection unit. The sludge in the housing is being mixed with the solidifying material, and the quality of the modified earth and sand is already determined depending on the location. Therefore, the above configuration enables feedback control of the solidifying material. Also, since the time difference between the detections of the second water content ratio detection means is shortened, feedback control with a small time lag is realized. Therefore, the quality of the modified earth and sand product can be stabilized.

(3) In the above (1) or (2), preferably, the second water content ratio detecting means is located substantially at the center in the longitudinal direction of the housing.

(4) In the above item (3), more preferably, the second water content ratio detecting means is located slightly downstream of the central portion in the longitudinal direction of the housing.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a sludge treatment apparatus of the present invention will be described below with reference to the drawings. FIG. 1 is a conceptual diagram showing a schematic configuration of a sludge treatment system using an embodiment of the sludge treatment device of the present invention. In FIG. 1, 10
Reference numeral 0 denotes a sludge throwing machine. In the present embodiment, a hydraulic excavator is arranged as the sludge throwing machine 100, but the sludge throwing machine 100 is not necessarily limited to this, and may be replaced by another machine such as a wheel loader according to the situation at the site. I don't mind. The sludge P1 carried in by a dump truck (not shown) or the like is temporarily stored in the pit D1 which is a storage place, and is scooped by the sludge charging machine 100.

200 is a sieving device, and the sieving device 200 is
This is a so-called vibrating screen that vibrates a grid member (not shown) provided on the upper surface and screens the objects to be sorted put in the grid member according to the particle size. However, the vibrating screen does not necessarily have to be used, and the lattice member may be replaced with a fixed screen that is simply fixed. Sludge P1 temporarily stored in pit D1
The sludge is thrown into the sieving device 200 by the sludge throwing machine 100 to remove foreign matters such as stones and large lumps, and then received in the pit D2.

Reference numeral 300 denotes a sludge throwing machine similar to the above, and this sludge throwing machine 300 rescues the sludge P2 in the pit D2. However, depending on the circumstances of the site, the sludge throwing machine 300 is not always necessary, and the sludge throwing machine 200 may also be used.

Reference numeral 400 is a sludge supply device for supplying sludge to a mixing device 600 (described later).
It is composed of a hopper 401 that receives sludge and a sludge supply unit 402 that draws out a substantially fixed amount of sludge in the hopper 401. In the present embodiment, the sludge supply unit 4
02 is constituted by a screw conveyor or the like as an example,
For example, a belt conveyor, a pressure pump, a paddle conveyor, or the like may be used, and the configuration is not limited. Reference numeral 403 is a drive device for the sludge supply unit 402. The sludge supply device 400 supplies sludge to a mixing device 600 described later by a sludge supply means (not shown). Examples of sludge supply means include a screw conveyor, a mud pump (pressure pump), a paddle conveyor,
Alternatively, various types such as a belt conveyor can be considered. Further, the sludge may be directly supplied from the sludge supply unit 402 to the mixing device 600.

Reference numeral 500 denotes a solidifying material supplying device for solidifying sludge. The solidifying material supplying device 500 is a solidifying material storage section 50.
1 and a supply unit 502 (see FIG. 2) for supplying the solidified material in the storage unit 501 in a substantially constant amount.
An example of the configuration of the supply unit 502 will be described below with reference to FIG.

FIG. 2 is a cross-sectional view showing the detailed structure of the supply unit 502 of the solidifying material supply device 500 which constitutes an embodiment of the sludge treatment device of the present invention. As shown in FIG. 2, the supply unit 502 is configured by a so-called rotary feeder. 503 is a flange, and this flange 50
3 is to attach the supply unit 502 to the lower opening (not shown) of the storage unit 501. Reference numeral 504 denotes a casing, and upper and lower portions of the casing 504 are opened as an inlet 505 and an outlet 506 of the solidifying material, respectively. Fifty
Reference numeral 7 denotes a fixed amount supply unit provided between the inlet 505 and the outlet 506, and the constant supply unit 507 has an inner wall surface formed in a substantially arc shape. Reference numeral 508 denotes a rotor provided in the fixed amount supply unit 507.
The rotary shaft 509 is rotatably supported by the rotary shaft 4, and a plurality of partition walls 510 radially provided on the rotary shaft 509.

That is, the fixed quantity supply unit 50 is supplied through the inlet 505.
The solidified material guided to the No. 7 is introduced into the space between the adjacent partition walls 510, 510, and is guided downward from the outlet 506 as the rotor 508 rotates. Further, the space capacity between the adjacent partition walls 510, 510 is constant, and the solidified material from each space between the partition walls is sequentially drawn out downward according to the rotation speed of the rotor 508.
In this type of rotary feeder, the supply amount of the solidifying material is determined by the rotor capacity (setting) and the rotation speed of the rotor 508. The rotor 508 is configured to be rotationally driven by a drive device 511 (see FIG. 5 described later) including, for example, an electric motor.

However, in this embodiment, the supply unit 502 of the solidified material supplying apparatus 500 is constituted by a rotary feeder as described above, but the present invention is not limited to this, and other types of feeders such as a screw feeder may be used. It doesn't matter. Even if it is a screw feeder,
By adjusting the rotation speed of the auger, it is possible to control the solidifying material supply amount.

Returning to FIG. 1, reference numeral 600 denotes a mixing device. The mixing device 600 mixes the sludge and the solidifying material supplied from the sludge supplying device 400 and the solidifying material supplying device 500, respectively, and improves them as a modified earth and sand product. It is quality. The configuration of the mixing device 600 will be described below with reference to FIGS. 3 and 4.

FIG. 3 is a side sectional view showing the detailed structure of the mixing apparatus constituting one embodiment of the sludge treatment apparatus of the present invention, FIG.
FIG. 4 is a cross-sectional view taken along the line IV-IV in FIG. 3, showing the detailed structure of the mixing device that constitutes one embodiment of the sludge treatment device of the present invention. 3 and 4, reference numeral 601 denotes a housing of the mixing device 600, and the housing 600 is
It is formed in a substantially cylindrical shape. Also, this housing 60
1 has an inlet 602 for sludge and solidifying material at approximately the center of one side in the longitudinal direction (left side in FIG. 3) and the other side in the longitudinal direction (see FIG. 3).
An outlet 603 for the modified earth and sand is provided at approximately the center of the side surface (middle right side).

Reference numeral 604 denotes a plurality of (four in this example) supporting rollers for supporting the housing 601.
04 is mounted on a base frame 605 via a bracket 606. 607 is this support roller 60
The four guide members 607 are formed in a substantially ring shape, and a plurality (four in this example) are attached to the outer peripheral portion of the housing 601 so as to sandwich the support rollers 604. Each roller 604 (or at least one roller 604) is connected to a driving device (not shown) so as to rotate, and the rotation of the roller 604 causes the housing 601 to rotate in the circumferential direction. ing.

Although not particularly shown, it is preferable that a level level or the like is provided on the base frame 605 or the like so that the level of the mixing device 600 can be grasped. Further, it is preferable that a plurality of level jacks and the like are provided on the base frame 605 so that the level of the base frame 605 can be adjusted while looking at the electronic level.

Reference numeral 608 denotes an agitating plate for transferring the sludge and the solidifying material in the housing 601 while agitating the agitating plate.
Are attached to the inner wall surface of the housing 601 in a substantially spiral shape by, for example, welding (bolt fastening may be used) or the like. When the support roller 604 rotates in the direction of arrow A as shown in FIG.
The rotation of the stirring plate 60 causes the mixture of sludge and solidifying material stored in the lower portion of the housing 601 to move toward the stirring plate 60.
8 is mixed along the inclination of No. 8 while being transferred toward the outlet 603. Although the sludge introduced into the housing 601 may be in a state close to water, the stirring plate 60
As it is mixed with the solidifying material by 8 and is transferred (as it goes to the right side in FIG. 3), it is solidified into aggregated particles and modified as modified earth and sand.

Reference numeral 609 denotes a solidifying material introducing pipe, and the solidifying material introducing pipe 609 guides the solidifying material received from the solidifying material supply device 500 into the housing 601. 610
Is a sludge introducing pipe, and the sludge introducing pipe 610 guides the sludge received from the sludge supply device 400 into the housing 601. Both the solidifying material introducing pipe 609 and the sludge introducing pipe 610 are introduced (arranged) into the housing 601 from the wall surface on one side in the longitudinal direction of the housing 601 (left side in FIG. 3) so that the tip end faces the inlet 602. Has been done. Reference numeral 611 denotes a first water content ratio detecting means located in the vicinity of the inlet 602 of the housing 601. The first water content ratio detecting means 611 is provided in the sludge introducing pipe line 610 and reforms the sludge introducing pipe line 610. It detects the water content of the previous sludge. The first water content ratio detecting means 611 is a known water content ratio sensor, and detects the water content ratio using, for example, the dielectric constant of the sludge to be detected, and outputs the detection signal.

Reference numeral 612 denotes a second member provided in the housing 601.
This second water content detection means 612
Are located substantially in the longitudinal direction (horizontal direction in FIG. 3) in the housing 601, and preferably slightly downstream (outlet 603 side) from the central part. Reference numeral 613 is a support member of the second water content ratio detection means 612, and this support member 613 is
It is supported by the base frame 605. Then, the support member 613 is bent from the base frame 605, then bent, and extends into the entrance 602.
Within 01, the vicinity of the tip is bent downward.

The second water content ratio detecting means 612 is attached to the tip of the supporting member 613, is located below the housing 601, and is immersed in the mixture of sludge and solidifying material in the housing 601. As shown by the broken line in FIG. 3, the lead wire from the second water content ratio detection means 612 passes through the inside of the support member 613 and the housing 6
01 extends out. The second water content ratio detecting means 612
Similar to the first water content ratio detection means 611, is also a known water content ratio sensor, and detects the water content ratio using, for example, the dielectric constant of the mixture of sludge and solidifying material to be detected, and outputs the detection signal. It is like this.

Reference numeral 614 denotes a modified sediment carrying-out screw conveyor, and the upstream (left side in FIG. 3) end of the modified sediment carrying-out screw conveyor 614 is arranged so as to face the inside of the housing 601 through an outlet 603. ing. As shown in FIG. 3, the upstream end of the modified earth and sand carrying-out screw conveyor 614 is obliquely formed so that the end face looks up (only if the upper end of the end is open at the end). However, the modified earth and sand lifted by the stirring plate 608 is received near the outlet 603. As shown in FIG. 3, in the present embodiment, for example, a belt conveyor, a paddle conveyor, or the like may be used instead of the modified earth and sand carrying screw conveyor 614.
Other transportation means may be used.

Reference numeral 615 denotes a third water content ratio detecting means provided on the modified sediment carrying screw conveyor 614, and the third water content ratio detecting means 615 is finally led out of the housing 601. The water content of the modified soil is detected. The detection result of the third water content ratio detection means 615 can be used, for example, for the final quality check of the modified soil, but in the present embodiment, it is not always necessary and may be omitted.

With the above configuration, the mixing device 600
Is mixed with sludge and solidifying material and discharged as modified soil. The sludge treatment device of the present embodiment is composed of a mixing device 600 having first and second water content ratio detecting means 611, 612, a solidifying material supply device 500, and a control means 700 described later. .

FIG. 5 is a block diagram showing the concept of controlling the solidifying material supply amount in one embodiment of the sludge treatment apparatus of the present invention. In FIG. 5, reference numeral 700 denotes a control means, and the control means 700 is the first and second water content ratio detection means 6 described above.
It has a function of controlling the solidified material supplying device 500 based on the detection signals from 11, 612. Control means 7
00 is an A / D converter 701, a ROM 702, a CPU 7
03, D / A converter 704, amplifier (amplifier) 705,
And a RAM 706 and the like. That is, the control means 70
At 0, the input detection signal is the A / D converter 701.
Is converted into a digital signal through the C, and stored in advance in the ROM 702 in accordance with the control procedure program, constants, etc.
The PU 703 performs arithmetic processing. Then, the calculation result of the CPU 703 is the D / A converter 704.
Is converted into an analog signal via the, and is amplified by the amplifier 705 and output.

FIG. 6 is a flow chart showing the control procedure of the solidifying material supply amount by the control means 700. When starting the sludge treatment by the sludge treatment device shown in FIG. 1 with reference to FIGS. 6 and 5, first, in step 110, the addition rate of the solidifying material to the water content ratio of the sludge (or Enter the desired water content, etc.) setting value. This set value is stored in the ROM 702, the RAM 706, or the like, for example. Next, move to step 120 to start the operation,
Sludge is supplied to the mixing device 600.

In step 130, the detection signal of the water content ratio of the sludge before reforming by the first water content ratio detection means 611 is input. The control means 700 calculates the solidifying material supply amount based on the setting value of step 110 according to the program in the ROM 702, and calculates and transmits (outputs) a command signal to the driving device 511 of the solidifying material supply device 500. . As a result, the solidifying material is supplied in step 140, and the mixing of the sludge and the solidifying material is started.

In step 150, the detection signal of the water content ratio of the mixture of sludge and solidifying material being reformed by the second water content ratio detecting means 612 is input. And step 160
Then, it is determined whether or not the detection result is a value stored within the preset range stored in advance. If the detected value is outside the preset range, the process proceeds to step 170.

In step 170, the correction amount of the solidifying material supply amount is calculated from the detection result of the water content of the mixture of sludge and the solidifying material being reformed. As the correction amount, for example, if the calculation result of the water content ratio exceeds the setting range, the increase of the solidification material supply amount is calculated, and conversely, if the calculation result of the water content ratio is below the setting range, the reduction amount of the solidification material supply amount is calculated. . However, in the case where there is no problem in quality due to the high water content ratio, the increase in the solidifying material supply amount may be calculated as the correction amount only when the calculation result is lower. Then, the command signal to the driving device 511 of the solidifying material supplying device 500 is corrected based on the calculated correction amount, and the process returns to step 140 to repeat the above procedure. Then, finally in step 160, when the calculation result of the water content based on the detection signal of the second water content detection means 612 falls within the set range, this control procedure is ended. The control means 700 is also capable of calculating the water content ratio of the modified earth and sand generated based on the detection signal of the third water content ratio detection means 615. This calculation result can be used to confirm the quality of the final modified sediment. However,
As described above, the third water content ratio detecting means 615 is
Not necessarily required.

In the present embodiment, by repeating the above procedure, the solidified material supply amount is feedback-controlled, and the modified earth and sand finally having a preferable water content ratio is obtained by the modified earth and sand deriving means 614. It is designed to be led out of the housing 601.

Returning to FIG. 1 again, reference numeral 800 denotes a modified earth and sand carrying-out conveyor, and the modified earth and sand carrying-out conveyor 800 is provided with the modified earth and sand discharged from the modified earth and sand carrying-out screw conveyor 614 of the mixer 600. It is received and accumulated at a predetermined accumulation position S. Reference numeral 900 denotes a dust collector, which is a housing 60 of the mixing device 600.
The dust and the like generated in 1 are sucked and collected.
In addition, as shown in FIG. 1, in the present embodiment, a belt conveyor is used as the modified sediment carrying-out conveyor 800, but the present invention is not limited to this. For example, other types of conveyors such as a screw conveyor and a paddle conveyor may be arranged instead.

Next, the operation of the sludge treatment device configured as described above will be described below. In FIG. 1, the sludge carried in by a dump truck or the like is temporarily stored in the pit D1. The sludge stored in the pit D1 is thrown into the sieving device 200 by the sludge feeding machine 100 to remove foreign matters and large lumps, and is temporarily stored in the pit D2. Pit D2
The sludge stored in (1) is thrown into the sludge supply device 400 by the sludge input machine 300, and is supplied to the mixing device 600 by the sludge supply unit 402 in a substantially constant amount. The sludge supplied to the mixing device 600 is mixed and reformed with the solidifying material supplied from the solidifying material supplying device 500. The modified earth and sand derived from the mixing device 600 is conveyed by the modified earth and sand carry-out conveyor 800 and finally accumulated at the accumulating position S. Also, during the above sludge treatment work, the mixing device 600
Dust and the like generated inside is collected by the dust collector 900.
The modified earth and sand accumulated at the accumulating position S are appropriately loaded on a dump truck or the like by a wheel loader (not shown) or the like and shipped.

In the present embodiment, as described above, the control means 700 controls the solidifying material based on the detection signals of the first and second water content ratio detecting means 611 and 612 provided in the mixing device 600. The amount of the solidified material supplied from the supply device 500 is feedback-controlled, and the modified earth and sand generated in the mixing device 600 has a stable water content with a water content ratio within a set range.

The operation and effect obtained in this embodiment will be described below. (1) Stabilization of Quality of Modified Sediment Product In the present embodiment, the second water content ratio detecting means 612 is provided in the housing 601 of the mixing device 600, and the housing 601 is provided by the second water content ratio detecting means 612. Detect the water content of the mixture of sludge and solidifying material that is being modified in the plant. Further, the first water content ratio detecting means 611 is provided in the sludge introducing pipe line 610 so as to be located near the sludge inlet 602 provided in the housing 601, and the water content ratio of the supplied sludge is detected. Then, by the control means 700, the first
The solidifying material supply amount is determined based on the detection signal of the water content ratio detecting means 611. At this time, the second water content ratio detecting means 612.
Thus, the water content ratio of the contents of the housing 601 being reformed (= mixture of sludge and solidifying material) is detected, and the solidifying material supply amount is corrected accordingly.

Since the second water content ratio detecting means 612 is provided in the housing 601, compared with the case where the second water content ratio detecting means 612 is provided near the outlet 603 of the housing 601, the first water content ratio detecting means 612 is provided. The distance to the ratio detecting means 611 is relatively short. That is, the sludge whose water content ratio has been detected by the first detection means 611 is
It is possible to shorten the time difference until the water content ratio is detected by the second water content ratio detection means 612. Housing 60
The sludge in No. 1 is being mixed with the solidifying material, and as in the present embodiment, the second water content ratio detecting means 612 is provided in the housing 601 at substantially the central portion (near the central portion) or downstream of the central portion. By providing it on the side (outlet 603 side), it is possible to detect the water content ratio of the mixture in a state where the quality of the modified earth and sand can already be determined. As a result, effective feedback control of the solidified material becomes possible.
By shortening the time difference between the detections of the second water content ratio detecting means 611 and 612, feedback control with a small time lag is realized, and the quality of the modified earth and sand product can be stabilized.

(2) Improvement of productivity As described above, according to the present embodiment, it is possible to generate a modified earth and sand product with stable quality, so that it is possible to reduce the occurrence of defective products. As a result, the yield can be reduced and the productivity can be improved.

Next, another embodiment of the sludge treatment apparatus of the present invention will be described with reference to FIG. FIG. 7 is a side sectional view showing a detailed structure of a mixing device constituting another embodiment of the sludge treatment device of the present invention. As shown in FIG. 7, the mixing device 650 used in the present embodiment is configured by a so-called paddle type mixing device, and is supported at a predetermined height position from the ground by a mount (not shown). .

In FIG. 7, reference numeral 651 is a housing of the mixing device 650, and the housing 651 is formed in a substantially trough shape so that the lower side thereof follows the rotation locus of the stirring means 656 (described later). The second water content ratio detecting means 612 is provided at a substantially central portion (preferably, an outlet side with respect to the center) in the longitudinal direction (horizontal direction in FIG. 7) in the housing 651. An inlet 652 is an inlet for sludge and a solidifying material, and the inlet 652 is one side in the longitudinal direction of the housing 651 (see FIG. 7).
It is provided on the upper part of the middle left side). Reference numeral 653 denotes an opening for carrying out the modified earth and sand, and the opening 653 for carrying out the modified earth and sand is provided in a lower portion of the housing 651 on the other side in the longitudinal direction (right side in FIG. 7).

Reference numeral 654 denotes a solidifying material introducing pipe for guiding the solidifying material from the solidifying material supply device 500 (see FIG. 1) into the housing 651. 655 is the above sludge supply device 400
It is a sludge introduction pipe line for guiding sludge from (see FIG. 1) into the housing 651. The solidifying material supply pipeline 654 and the sludge introduction pipeline 655 are arranged so that the tips thereof face above the inlet 652 (from one side in the longitudinal direction of the housing 651 (left side in FIG. 7) directly into the housing 651. It may be introduced). Note that, also in the present embodiment, the above-mentioned first water content ratio detecting means 611 for detecting the water content ratio of the sludge before reforming is provided in the sludge introducing pipe line 655.

Reference numeral 656 is a stirring means (paddle mixer) for mixing the introduced sludge and the solidifying material. This stirring means 65
Reference numeral 6 is composed of a rotary shaft 657 extending in the longitudinal direction (horizontal direction in FIG. 7) inside the housing 651, and a plurality of stirring blades (paddles) 658 radially implanted in the rotary shaft 657. . Each stirring blade 658 is inclined with respect to the axial direction of the rotation shaft 657 so as to be directed in the rotation direction. The stirring means 656 is not limited to the number thereof, and may be one or plural. When a plurality of them are provided, it is desirable that they are arranged so as to be substantially parallel to each other, and that adjacent ones rotate in mutually opposite directions. Even if a plurality of agitating means 656 are provided, in order to make the moving directions of the agitating means 656 the same (rightward in FIG. 7 in this example), in the agitating means rotating in mutually opposite directions, the inclination direction of the agitating blade 658 Reverse (in any case, incline so as to face the direction of rotation with respect to the axial direction). As an example, in the present embodiment, two stirring means 656 are provided.

659 and 659 are bearings for the rotary shaft 657, and 6
Reference numeral 60 denotes a gear provided near the rear end (right end in FIG. 7) of each rotating shaft 657. When a plurality of stirring means 656 are provided, adjacent rotating shafts 657 are engaged with each other via this gear 660 ( However, the configuration is not limited to this, and may be connected by, for example, a belt). Reference numeral 661 denotes a drive device that rotationally drives the stirring means 656, and an output shaft (not shown) of the drive device 661 is directly connected to the rear end of the rotary shaft 657. With such a configuration, by rotating the driving device 661, adjacent rotating shafts 657 are simultaneously driven to rotate in opposite directions. 662 is an inspection window for inspecting the inside of the housing 651.

Other configurations, for example, the output of the first and second water content ratio detecting means 611 and 612 to the control means 700 (see FIG. 5), the control procedure of the solidifying material supply amount of the control means 700, and the sludge treatment. The configurations and the like of other devices that configure the system are the same as those in FIGS. 1 to 6 described above.

With the above structure, the sludge and the solidifying material introduced from the inlet 652 of the housing 651 are agitated by the stirring means 6.
While being uniformly stirred and mixed by 56, they are transferred toward the modified earth and sand discharge opening 653. Then, during this transfer, the modified earth and sand is generated. The modified earth and sand generated in this way is led out from the modified earth and sand carrying-out opening 653 to the above-mentioned modified earth and sand carrying-out means 800 (see FIG. 1) by its own weight.

Also in this embodiment, the housing 65
Near the inlet 652 provided in No. 1 (within the sludge introduction pipe 655)
Further, a first water content ratio detecting means 611 for detecting the water content ratio of the sludge before reforming is provided. Also, the housing 651
Below (in the center in the longitudinal direction, preferably at a position slightly downstream of the center, that is, near the modified earth and sand carrying-out opening 653),
Second water content ratio detection means 612 is provided for detecting the water content ratio of the mixture of sludge and solidifying material being reformed. As described above, the present invention can be applied even when the paddle type mixing device is applied as a sludge treatment device. Of course, the present invention is also applicable to the case where other types of mixing devices such as a screw mixer are applied to the sludge treatment device. Also in these cases, the same effect as that of the above-described embodiment can be obtained.

Still another embodiment of the sludge treatment device of the present invention will be described with reference to FIG. FIG. 8 is a side sectional view showing a schematic configuration of still another embodiment of the sludge treatment device of the present invention. However, the same parts as in FIG. 3 or parts that can be considered to be similar are given the same reference numerals as those in FIG. 3 and their explanations are omitted. As shown in FIG. 8, in the sludge treatment device of the present embodiment, the mixing device is provided with a solidifying material storage part 501, a supply part 502 (both shown in FIG. 5), and a control means 700 (not shown). The sludge can be treated by itself. That is, the storage part 501 and the supply part 502 are directly connected to the solidification material introduction pipe line 609, and the solidification material supplied via the supply part 502 is introduced into the housing 601 together with the sludge, and the sludge and the solidification material. Are mixed to form modified earth and sand. Then, the modified earth and sand is conveyed by the modified earth and sand carrying-out screw conveyor 614, and finally the modified earth and sand outlet 6
It is designed to be discharged from 20.

Also in this embodiment, the first and second water content ratio detecting means 611 and 612 are respectively arranged in the sludge introducing pipe line 610 and the housing 601 (almost the central portion in the longitudinal direction, preferably slightly downstream of the central portion). Side). Then, by the control means 700, based on the detection signals of the first and second water content ratio detection means 611, 612,
The drive unit of the supply unit 502 (not shown, the drive device 51 of FIG. 5).
(See 1), and the feed rate of the solidifying material is feedback-controlled.

As in the present embodiment, the solidifying material supply function,
The present invention can be applied to a sludge treatment device that integrally has a mixing function and a function of carrying out modified soil, and similar effects can be obtained.

Further, in the above, the mixing devices 600, 6
Although 50 has been described as an example of sludge such as excavated soil generated by a shield construction or the like as an object to be modified, other objects to be modified in the sludge treatment device of the present invention are other objects. Various things are possible. For example, animal excrement of livestock, chickens, rats, etc. generated in farms, factories, etc., and dredged soil generated in dredging construction sites of lakes, rivers, and harbors can also be reformed.

Further, in order to stabilize the quality of the modified earth and sand, the supply amount of the solidifying material is controlled. For example, the supply amount of sludge is determined based on the detection result of the second water content ratio detecting means 612. A configuration for feedback control is also conceivable. in this case,
For example, with the supply amount of the solidifying material being constant, in step 160 in the flowchart of FIG. 6, the water content ratio of the modified earth and sand being modified (a mixture of sludge and solidifying material being modified) exceeds the set range. In this case, it suffices to output a command signal to a driving device (not shown) of the sludge supply device 400 to reduce the sludge supply amount. On the contrary, when the water content ratio is below the set range, the sludge supply amount may be increased. However, in general, in sludge treatment, the amount of sludge supplied is large relative to the amount of solidifying material supplied, and the amount and properties thereof are not stable. preferable.

[0056]

According to the present invention, by providing the second water content ratio detecting means in the housing, the sludge having the water content ratio detected by the first water detecting means has a second water content ratio as compared with the conventional one. The time required until the water content ratio is detected by the ratio detection means can be shortened. As a result, feedback control with a small time lag is realized, and the quality of the modified earth and sand product can be stabilized.

[Brief description of drawings]

FIG. 1 is a conceptual diagram showing a schematic configuration of a sludge treatment system using an embodiment of a sludge treatment device of the present invention.

FIG. 2 is a cross-sectional view showing a detailed structure of a supply unit of a solidifying material supply device that constitutes an embodiment of a sludge treatment device of the present invention.

FIG. 3 is a side sectional view showing a detailed structure of a mixing device that constitutes an embodiment of the sludge treatment device of the present invention.

FIG. 4 is a cross-sectional view taken along the line IV-IV in FIG. 3, showing the detailed structure of the mixing device that constitutes one embodiment of the sludge treatment device of the present invention.

FIG. 5 is a block diagram showing a concept of controlling the solidifying material supply amount in the embodiment of the sludge treatment device of the present invention.

FIG. 6 is a flowchart showing a control procedure of a solidified material supply amount in an embodiment of the sludge treatment device of the present invention.

FIG. 7 is a side sectional view showing a detailed structure of a mixing device constituting another embodiment of the sludge treatment device of the present invention.

FIG. 8 is a side sectional view showing a schematic configuration of still another embodiment of the sludge treatment device of the present invention.

[Explanation of symbols]

500 Solidifying material feeding device (solidifying material feeding means) 501 Storage (solidifying material supply means) 502 Supply unit (solidifying material supply means) 600 mixing device 601 housing 609 Solidifying material introduction line 610 Sludge introduction pipeline 611 First water content detection means 612 Second water content ratio detecting means 650 mixing device 651 housing 654 Solidifying material introduction line 655 sludge introduction pipeline 656 stirring means 657 rotation axis 658 Stirrer 700 control means

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 2D054 DA35                 4D059 AA09 BG00 BJ20 CB06 CC04                       EA01 EB11

Claims (4)

[Claims] 1. A sludge treatment device that mixes a solidifying material with sludge to produce modified soil, and a cylindrical housing that agitates the charged sludge and the solidifying material while rotating, and a housing on one side in the longitudinal direction of the housing. A mixing device having a sludge introducing pipe and a solidifying material introducing pipe introduced into the housing from a wall surface, a modified earth and sand carrying screw conveyor that is led out of the housing from the wall surface on the other side in the longitudinal direction of the housing, A first water content ratio detecting means provided in the sludge introducing pipe for detecting a water content ratio of the sludge before reforming; and a water content of the sludge in the middle of reforming provided in the housing and mixed with a solidifying material. A second water content ratio detection means for detecting a ratio, a solidification material supply means for supplying a solidification material to the solidification material introduction pipeline, a first water content ratio detection means, and a second water content ratio detection means. For detection signal Hazuki, sludge treatment apparatus being characterized in that a control means for transmitting a control signal for controlling the supply amount of the solidifying material by the solidifying material supply means to said solidifying material supply means. 2. A sludge treatment device for mixing a solidifying material with sludge to produce modified earth and sand, a housing, a sludge introducing pipe and a solidifying material introducing pipe introduced into the housing from one longitudinal side of the housing. A mixing device having an opening for carrying out reformed earth and sand provided on the other side in the longitudinal direction of the housing, a stirring means provided in the housing, and a water content of the sludge before reforming provided in the sludge introduction pipe line A first water content ratio detection means for detecting a ratio, a second water content ratio detection means provided in the housing for detecting a water content ratio of sludge in the middle of reforming mixed with the solidification material, and the solidification material introduction Based on the detection signals of the solidification material supply means for supplying the solidification material to the pipeline, the first water content ratio detection means, and the second water content ratio detection means, the supply amount of the solidification material by the solidification material supply means is determined. Control signal to control And a control means for transmitting the number to the solidifying material supply means. 3. The sludge treatment device according to claim 1 or 2, wherein the second water content ratio detection means is located substantially at the center in the longitudinal direction of the housing. 4. The sludge treatment device according to claim 3, wherein the second water content ratio detecting means is located at a position slightly downstream of a central portion in the longitudinal direction of the housing.