JP4420488B2 - Mud draining device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
In the present invention, the sludge accumulated on the bottom surface of the sedimentation basin is raked into a sludge pit provided on the bottom surface of the sedimentation basin by a scraper, and the scraped sludge is collected from the sludge pit through a discharge pipe to the sedimentation basin. The present invention relates to a mud discharge device that discharges outside.
[0002]
[Prior art]
Conventionally, a water treatment facility such as a water purification plant facility or a sewage plant facility has been provided with a sedimentation basin for settling and separating sedimentary solids. The sedimentation basin is provided with a scraper for scraping the sludge accumulated on the bottom surface to a sludge pit provided on a part of the bottom surface. The sludge pit has a cross-sectional shape formed in an inverted conical shape, and is configured to be discharged continuously or intermittently through a discharge pipe opened at the bottom of the sludge pit.
[0003]
[Problems to be solved by the invention]
However, when the sludge is discharged from the sludge pit, the conventional sludge apparatus described above forms a water path in the sludge in the sludge pit, so that the concentration of the discharged sludge is reduced, and the sludge treatment after that is performed. There was a drawback that the load was high.
[0004]
If it demonstrates further using FIG. 2, when the sludge accumulated on the bottom face of the sedimentation basin b is scraped by the scraper 20 to the sludge pit 21, and the sludge pit 21 will be almost filled with the sludge S (FIG. 2 (a )), The valve V provided in the discharge pipe 22 is opened.
[0005]
When the valve V is opened, the sludge S is discharged from the lower portion of the sludge pit 21. During this discharge, a water path is formed as indicated by an arrow in FIG. As a result, thin sludge is discharged. Accordingly, there is a drawback that the load of the subsequent sludge treatment increases, and the sludge S adhering to the wall surface of the sludge pit 21 is gradually fixed and is not discharged from the sludge pit 21.
[0006]
The present invention, which was made to solve the above drawbacks, and its object is such that the water way is formed in the sludge pit Ku was the sludge to be discharged efficiently discharge It is to provide a mud device.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, the present invention scrapes the sludge accumulated on the bottom surface of the sedimentation basin to the sludge pit provided on the bottom surface of the sedimentation basin by a scraper, and removes the sludge collected from the sludge pit. In the mud draining apparatus for discharging to the outside of the sedimentation basin through the discharge pipe, a perforated plate covering the upper surface of the sludge pit is provided, and the total area of the holes of the perforated plate is set to the sectional area of the holes of the discharge pipe The scraper is provided with a reciprocating scraper having a scraping plate that reciprocates the bottom surface of the sedimentation basin and the top surface of the porous plate.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view of a mud discharge apparatus according to the present invention. The sedimentation basin a can receive raw water from one end side (left side in FIG. 1) via the raw water inflow pipe 1a, and discharge treated water (supernatant water) via the treated water outflow pipe 1b provided on the other end side. The shape of the well-known cross-flow type sedimentation basin comprised as follows is exhibited.
[0009]
Bottom 2 of the settling tank a is be formed into a flat surface substantially horizontally, the raw water receiving side of the bottom 2, sludge pit (sludge reservoir) 3 is provided.
[0010]
The scraping machine 4 has a plurality of scraping plates 5a, 5a,... Which are movably mounted on the bottom surface 2 of the settling basin a. The scraping plates 5a, 5a... Are provided in parallel with each other at a predetermined interval. And each scraping plate 5a, 5a ... is the length substantially equal to the width direction (direction orthogonal to the flow direction of raw | natural water) of the sedimentation tank a similarly to the scraping plate in a known reciprocating type scraping machine. The cross-sectional shape (the cross-sectional shape in the direction perpendicular to and parallel to the flow direction of the raw water) has a concave shape in which the bottom is shallowly depressed in the center, and the other two sides are convex. The scraper 4 is configured by being attached to the connecting member 6 in a state in which the isosceles triangle formed is rolled over, with the bottom side facing the sludge pit 3 side.
[0011]
A link mechanism 7 is coupled to the connecting member 6 of the scraper 4. The link mechanism 7 converts the rotational motion by the motor M into the reciprocating motion of the scraper 4, and the upper end of the connecting rod 7a of the link mechanism 7 decelerates the rotational speed of the motor M at a predetermined rate. It is connected to a well-known speed reducer 8 such as a gear type, and the lower end portion of the connecting rod 7a is rotatably connected to one tip portion of a triangular conversion portion 7b provided on the side wall of the settling basin a. Has been. Further, the other tip portion of the conversion portion 7b is rotatably supported on the side wall of the settling basin a, and the other end portion of the conversion portion 7b is connected to the connecting member 6 of the scraper 4 at the other end portion. A connecting rod 7c that is pivotably coupled to each other is rotatably coupled. Therefore, when the connecting rod 7a moves up and down, the scraper 4 can reciprocate on the bottom surface 2 of the settling basin a, as indicated by arrows 1 and 2.
[0012]
In FIG. 1, reference numeral 10 denotes a perforated plate, which is provided so as to cover the upper surface of the sludge pit 3, that is, to be flush with the bottom surface 2. A portion A of the perforated plate 10 is shown enlarged in a circle A on the left side.
[0013]
The holes 11, 11... Provided in the perforated plate 10 are arranged substantially evenly when the perforated plate 10 is viewed from the upper surface, and the total area of all the holes 11, 11. It is designed to be smaller than the cross-sectional area of the hole of the discharge pipe 12 that is open to the bottom. The number of holes 11 is appropriately determined depending on the size of the perforated plate 10, the type of sludge, the nature of the sludge, and the like.
[0014]
Since the total area of the holes 11, 11... Is smaller than the cross-sectional area of the hole of the discharge pipe 12, the valve V provided in the discharge pipe 12 is opened and the mud from the sludge pit 3 is started. Then, a flow having a high flow velocity is generated in the holes 11 of the perforated plate 10.
[0015]
When the raw water is supplied to the sedimentation basin a, the sedimentation separation is performed, and the sludge is accumulated on the bottom surface 2, the motor M is driven and the scraper 4 reciprocates via the link mechanism 7. Is done. The sludge accumulated on the bottom surface 2 by the reciprocating motion of the scraper 4 is moved to the sludge pit 3 side, and the moved sludge is introduced into the sludge pit 3 through the holes 11, 11.
[0016]
Next, when the valve V of the discharge pipe 12 is opened, the sludge in the sludge pit 3 is discharged out of the sedimentation basin through the discharge pipe 12, and along with the discharge, the sludge pit through the holes 11, 11,. 3 has a high flow velocity. Due to the fast flow, the sludge accumulated on the perforated plate 10 is introduced so as to be efficiently extracted into the sludge pit 3, and the sludge in the sludge pit 3 does not stay in the sludge pit 3 and is discharged from the discharge pipe. 12 is discharged.
[0017]
In the present invention, the scraping machine 4 is provided with a scraping plate 5a that slides on the perforated plate 10 as shown in FIG. Therefore, Ru can be effectively dropped sludge into the sludge pit 3.
[0018]
When the discharge of the sludge in the sludge pit 3 is finished, the valve V is closed and the sludge discharge operation is finished. The drive control of the scraper 4 and the valve V is automatically performed by a controller (not shown). A detection signal from a sensor or the like that detects the accumulation state of sludge provided in the settling basin is input to the controller as necessary. When the sludge discharge is finished so that the sludge remains slightly in the sludge pit 3, only the high-concentration sludge can be discharged out of the sedimentation tank a.
[0019]
【The invention's effect】
According to the present invention, the sludge accumulated on the bottom surface of the sedimentation basin is raked into a sludge pit provided on the bottom surface of the sedimentation basin by a scraper, and the scraped sludge is removed from the sludge pit via a discharge pipe. In the mud discharge device that discharges outside the sedimentation basin, a porous plate that covers the upper surface of the sludge pit is provided, and the total area of the holes of the porous plate is made smaller than the sectional area of the holes of the discharge pipe. As a result, a flow with a high flow velocity is generated in the holes of the slag, so that the sludge accumulated on the perforated plate is introduced by the fast flow efficiently into the sludge pit, and the sludge in the sludge pit is also water. It is discharged from the discharge pipe without forming a road, that is, without staying in the sludge pit. Further, as the raking machine, because with a reciprocating raking machine having a raking plate reciprocating bottom and upper surface of the perforated plate of the settling tank was scraped onto a perforated plate by the take Yadorikiban Sludge can be effectively dropped into the sludge pit. Therefore, Ru can be discharged efficiently with high concentration sludge from the settling basin.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a mud discharge apparatus according to an embodiment of the present invention.
FIG. 2 is an explanatory diagram for explaining the state of mud discharged from a conventional sludge pit.
[Explanation of symbols]
1a water inlet pipe 1b treated water outlet pipe 2 bottom surface <br/> 3 sludge pit (chamber)
4 take-preferred machine 5a raking plate 6 Consolidated member 7 link mechanism 10 a perforated plate 11 holes
a precipitation Shingarichi 12 discharge pipe V valves

Claims (1)

The sludge accumulated on the bottom surface of the sedimentation basin is raked into the sludge pit provided on the bottom surface of the sedimentation basin by a scraper, and the scraped sludge is discharged from the sludge pit to the outside of the sedimentation basin through the discharge pipe. In the drainage device
While providing a perforated plate covering the upper surface of the sludge pit,
The total area of the holes of the perforated plate is smaller than the cross-sectional area of the holes of the discharge pipe,
As the scraper, comprising a reciprocating scraper having a scraping plate that reciprocates the bottom surface of the sedimentation basin and the top surface of the porous plate,
A mud drainage device.

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