JP2724442B2 - Screw-type waste mud solid-liquid separator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the field of a screw type waste mud solid-liquid separator.

[0002]

2. Description of the Related Art Conventionally, waste mud discharged in large quantities due to ground improvement work is fed to a coagulation reaction tank together with a flocculant, the fed waste mud is flocculated, and the floc is separated into a liquid and a solid. Japanese Patent Application No. 6-242290 (the title of the invention, a bag-type waste muddy water separator) filed by the applicant of the present invention has been proposed.

In a conventional bag-type waste muddy water separating apparatus, when a floc is introduced into a filter cloth more than a predetermined amount, the floc being conveyed may protrude from the filter cloth during pressing and dewatering.

[0004] Further, as described above, the input floc may protrude from the filter cloth body, and there is a possibility that the surroundings where the waste muddy water separation device is installed may be soiled.

Further, since the flocs loaded in the filter cloth of the conventional separating device are pressed via the pressing roller, the loaded flocks are not compressed by their own weight, and the dewatering efficiency is reduced. It was bad.

Further, the conventional separating device has to be installed in a state where the entire mechanism is spread in a plane. Therefore, work could not be performed in a narrow site.

[0007]

SUMMARY OF THE INVENTION However, the solid-liquid separation device of the present invention has an inclined shape and a screw type.
The flocs that have been scooped up and filled by the screw part are in a concentrated state, conveyed upward, pressed together by the own weight of the flocs during conveyance, dewatered the contained water, and further conveyed upward by the screw part, In addition, the water content of the compressed floc is vacuum-suctioned through a vacuum device to reduce sludge with a low moisture content (reduced by 40% from the conventional one), and the floc solid-liquid separation device is made compact. And that the processing capacity of solid-liquid separation was remarkably improved in a short time, and the treated water stored in the casing was treated in a short time.
It has many excellent advantages, such as being able to remarkably increase the processing capacity compared to the conventional one.

[0008]

SUMMARY OF THE INVENTION According to the present invention, ground improvement waste mud and a coagulant are fed into a coagulation reaction tank, the fed waste mud is flocded, the floc is sent to a solid-liquid separation device, and the waste mud is discharged. Solid-liquid separation for flock in which a screw part is attached to the shaft part of the ground improvement waste mud solid-liquid separation device that separates into floc and moisture at predetermined intervals, and a reducer is attached to one end of the shaft part. The device is mounted in an inclined manner in a casing, and the solid-liquid separation device for flock is provided.
The pitch of the screw section below the
Larger than the pitch of the screw at the top of the liquid separator
At the bottom of the floc.
To form a flock separation section above the solid-liquid separation device for
The pitch of the screw portion is adjusted to the lower concentration portion of the floc.
A floc separating portion having a moisture extracting portion is attached above the inclined solid-liquid separating device for flocs, and a floc outlet is attached above the floc separating portion. Then, a treated water collecting section having a drum or the like as a constituent member is attached to a lower portion of the solid-liquid separating device for flocs, and a nozzle connected to the coagulation reaction tank is connected to the casing. This is a waste mud solid-liquid separator.

Further, the present invention provides a method for forming a rotary drum constituting the treated water collecting section with a fine screen, mounting an injection nozzle inside the rotary drum, and evacuating the rotary drum. Is a screw type waste mud solid-liquid separation device in which a vacuum device section is formed.

[0010] The present invention is also a screw-type waste mud solid-liquid separation apparatus in which a partition plate is attached in a hanging manner or in a slant manner in front of a rotary drum constituting a treated water collecting section.

[0011]

The operation of the present invention will be described below.

When a large amount of waste mud discharged by the ground improvement work is sent to the coagulation reaction tank together with the coagulant, floc is formed in the tank. This is the same as the conventional waste mud separation apparatus.

Next, the waste mud flocked in the tank is conveyed into the casing via a nozzle. The transported flocks settle at the bottom of the casing. The floc that has settled is mutually compressed while the floc that has settled is scooped up by the screw part that constitutes the floc lower concentrating unit, due to the inclined screw part that constitutes the rotating floc solid-liquid separator. To the upper part of the inclined screw part.

When the flock is conveyed by the inclined screw section as described above, when the flock reaches the flock separation section in which the pitch of the screw section is formed to be slightly narrower, the flock is further reciprocated more than in the above case. The moisture contained in the floc is dehydrated by the enclosing portion and the evacuation portion which are pressed against each other and held in a holding state. Furthermore, sludge that has been transported and dewatered is taken out.

At this time, since the enclosing portion has a configuration in which the elongated enclosing member is provided with a slight gap portion and the ends are connected, when the floc is dehydrated through the vacuum evacuation portion, the gap between the enclosing member is reduced. There is no accumulation of fine-grained flocs in the portion and no clogging phenomenon. Therefore, the floc is dewatered by the screw portion where the pitch of the floc separating portion is narrow, and
The dewatering efficiency could be synergistically increased by the above-mentioned surrounding portion and the vacuuming portion integrally mounted.

As described above, the solid-liquid separation device of the present invention
While mounting the screw part in an inclined manner, and while decelerating, scoop up the flock inside the screw part, the flock that was picked up mutually pressed by the screw part whose pitch was narrowed, and the water content of the floc was gradually reduced. Since it can be dewatered, it is possible to work in a narrow land sufficiently with only a space slightly larger than the width of the screw part.

Further, in the case of the present invention, since the speed reducer is used, the rotation speed of the screw portion can be adjusted appropriately.

Further, in collecting the treated water stored in the casing, in the case of the present invention, the flock inserted as much as possible through the partition plate is prevented from approaching the outer peripheral portion of the screen-shaped rotary drum. . Then, a vacuum device is attached to the inside of the rotating drum, and fine-grained flocs are attached to the outer periphery of the drum. Further, water is sprayed in the direction of the drum from the inner jet nozzle, the fine-grained flocs adhering to the outer periphery of the drum are dropped into the casing, and only clean water is discharged to the outside via the vacuum device.

Further, the treated water can be efficiently collected by a collecting gutter attached to a rotating drum constituting a treated water collecting part.

[0020]

Next, an embodiment of the present invention will be described as follows.

Reference numeral 1 denotes a coagulation reaction tank into which ground improvement waste mud and a coagulant are fed, and reference numeral 2 denotes a nozzle for feeding the floc from the reaction tank 1 to a casing 3. Reference numeral 4 denotes a floc solid-liquid separator in which a screw portion 6 is attached to the shaft portion 5 and a speed reducer 7 is mounted at one end of the shaft portion 5 at predetermined intervals. The device 4 is mounted in the casing 3 at an angle. A floc separating section 9 having a water extracting section 8 is attached above the floc solid-liquid separating device 4, and a floc outlet 10 is attached above the floc separating section 9. A treated water collecting section 11 having a drum or the like as a constituent member is attached to a lower portion of the solid-liquid separating device 4 for flocs and inside the casing 3. The nozzle 2 connected to the agglutination reaction tank 1 is looked into the casing 3.

Furthermore, the pitch (for example, 20 cm) of the screw portion 6 below the solid-liquid separation device 4 for flocs is
The pitch is larger than the pitch (for example, 15 cm) of the screw portion 6 at the upper portion of the solid-liquid separator 4 for flocs. The pitch of the screw portion 6 forming the floc separating portion 9 in the upper portion of the solid-liquid separating device 4 for flocs is smaller than the pitch of the lower concentrating portion 13 of the flocs.

Reference numeral 14 denotes a rotary drum which constitutes the treated water collecting section 11. The drum 14 is a fine screen, and an injection nozzle 15 is provided inside the rotary drum 14.
Attach. Reference numeral 16 denotes a vacuum unit for evacuating the inside of the rotary drum 14, and 12 denotes a water collecting gutter.

Reference numeral 17 denotes a partition plate which is attached to the front part of the rotary drum 14 constituting the treated water collecting part 11 in a hanging or inclined shape.

Numeral 18 is an enclosing portion to which an elongated enclosing member 19 is connected so as to hold the screw portion 6 constituting the inclined floc separating portion 9 from below. A vacuum-type water draining unit 8 is mounted below the enclosing unit 18.

Reference numeral 20 denotes a base for supporting the casing 3;
Is a sludge transfer section.

[0027]

The present invention has the following effects.

[0028] The flock for solid-liquid separation device attached to the inclined into the casing through a deceleration device allowed turning the screw portion at a predetermined rate, the lower concentration of the lower portion of the pitch of the screw portion constituting the device The floc separated from the lower part is concentrated in the gap of the screw part, while the water contained in the flock is dehydrated. Does not protrude from the casing, and when it reaches the upper part of the floc separating part, the concentrated floc is pressed further together with its own weight by the screw part having a small pitch to be concentrated and the contained water is dehydrated, and the contained water is dehydrated. By the vacuum-type water drainage part that constitutes the surrounding part attached to the lower part, it is surely dehydrated,
It has the advantage that sludge formation with an extremely low water content of about 40% can be performed in a very narrow place and solid-liquid separation of waste mud efficiently.

Further, according to the present invention, a treated water collecting section is mounted in a casing, and the accumulated treated water is made to adhere to an outer peripheral portion of a screen-shaped rotary drum, and the attached fine-grained flocs are passed through a nozzle. Since it is sprayed and washed off from the inside, only clean water is discharged out of the casing by the vacuum device, which has the advantage of not causing a pollution problem.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view of a screw-type waste mud solid-liquid separator according to the present invention.

FIG. 2 is a plan view of a main part of the device.

FIG. 3 is a partially cutaway enlarged side view of the device.

FIG. 4 is a partially cut-away enlarged slope view of the components shown in FIG. 3;

FIG. 5 is a partially cutaway enlarged plan view of a main part of the device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Coagulation reaction tank 2 ... Nozzle 3 ... Casing 4 ... Solid-liquid separation device for flocks 5.
··· Shaft part 6 ··· Screw part 7 ··· Speed reducer 8 ··· Moisture removal part 9 ··· Flock separation part 10 ··· Flock removal port 11 ··· Treated water collection part 12 Collecting gutter 13 ・ ・ ・ Lower concentration part 14 ・ ・ ・ Rotary drum 15 ・ ・ ・ Injection nozzle
16 Vacuum device part 17 Partition plate 18
... Enclosing part 19 ... Enclosing member 20 ... Base part 21 ... Conveying part

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code Agency reference number FI Technical indication B01D 33/44 33/58

Claims (3)

(57) [Claims] 1. A ground for feeding ground improvement waste mud and a flocculant into a flocculation reaction tank, flocking the fed waste mud, sending the floc to a solid-liquid separator, and separating the waste mud into floc and moisture. structure improved waste mud solid-liquid separator
With screw portions in the axial section which formed is attached to the predetermined intervals, the flock for solid-liquid separation apparatus was allowed mounted speed reducer at one end of the且軸unit, it is mounted on inclined in the casing, before
The screw at the lower part of the solid-liquid separator for flocking
Switch on the upper part of the solid-liquid separator for flocs.
The pitch of the flock
A lower concentrating unit, and an upper part of the solid-liquid separator for flocs.
The pitch of the screw part forming the flock separation part of
It is formed smaller than the lower concentration part of the floc,
A floc separating section having a moisture extracting section is attached above the slanted solid-liquid separating device for flocs, and a floc outlet is attached above the floc separating section. At the lower part of the device, and attached a treated water collecting part having a drum or the like as a constituent member in the casing,
A screw-type waste mud solid-liquid separation device characterized in that a nozzle connected to a coagulation reaction tank is provided in the casing. 2. A rotary drum constituting the treated water collecting section.
Formed with a fine screen and a rotating drum
Attach the spray nozzle to the inside of the
That a vacuum device for forming a vacuum
The screw type waste mud solid-liquid separation device according to claim 1,
Place. 3. A front part of a rotating drum constituting a treated water collecting part.
That the partition plate has been attached to the
2. A screw-type waste mud solid-liquid separation according to claim 1, wherein
apparatus.