JPH119907A - Sludge withdrawal pipe blockage prevention device - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To prevent adhesion of scale on a pipe wall surface of a pipe. SOLUTION: While having a pit 2 in the center of the bottom,
A sedimentation basin 1 having a scraping plate 5 for scraping sedimentation sludge to the pit 2 by rotation about a drive shaft, and one end communicating with the pit 2 of the sedimentation basin 1 and the other end communicating with the sludge pump 7. 1
A sludge pulling pipe 6 for pulling sludge out of a sludge pulling pipe 6, a rotating blade 8 rotating around a pipe axis in the sludge pulling pipe 6.
Is arranged along the pipe axis, and a gear mechanism for transmitting a rotational force is interposed between one end of the rotary shaft 9 of the rotary blade 8 and the drive shaft 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for preventing a sludge withdrawal pipe from being clogged in a sedimentation basin or a coagulation sedimentation tank.

[0002]

2. Description of the Related Art Conventionally, a leachate treatment facility is provided in a final landfill or the like for treating leachate. The leachate treatment facility has a pretreatment facility, a biological treatment facility, a coagulation sedimentation treatment facility, an advanced treatment facility, a sludge treatment facility, and the like. In the pretreatment facility, calcium ions in raw water are injected with sodium carbonate. As a result, a coagulated sediment is separated as a solid sediment, thereby preventing scaling of piping and equipment in a subsequent process. In the coagulation sedimentation treatment equipment, the pollutants in the biological treatment water derived from the biological treatment equipment are aggregated by chemicals,
Gravity precipitation has been removed. In a sludge treatment facility, sludge generated from the process of leachate treatment is concentrated and then subjected to centrifugal dewatering, and the dewatered cake is disposed of in landfill.

[0003]

However, in the above-mentioned conventional configuration, in the conduit for guiding sludge from the coagulation and sedimentation equipment to the sludge treatment equipment, calcium in the sludge solidifies to form scale on the pipe wall surface. Therefore, washing with high-pressure fresh water or acid is performed at an appropriate time, but there is a problem of blockage due to enlargement of the scale.

An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide a sludge withdrawal pipe blockage prevention device for preventing scale from adhering to a pipe wall surface.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a sludge withdrawal pipe blockage prevention device of the present invention has a pit at the center of the bottom and scrapes the settled sludge to the pit by rotation about a drive shaft. A sedimentation basin with a scraping plate,
In a treatment system having a sludge withdrawing pipe having one end communicating with the pit of the sedimentation basin and the other end communicating with the sludge pump and withdrawing sludge from the sedimentation basin, a rotary blade rotating around the pipe axis in the sludge withdrawal pipe. Are arranged along the pipe axis, and a gear mechanism for transmitting a rotational force is interposed between one end of the rotary shaft of the rotary blade and the drive shaft.

The rotating blades are arranged so as to be able to reciprocate in the axial direction of the pipe, and a position adjusting device for moving the rotating blades in and out of the axial direction of the sludge is provided in the middle of the sludge drawing pipe, and the gear mechanism is provided on the drive shaft. The driven gear provided on the rotating shaft of the rotating blade is configured to move between a position where it meshes and a position where it is disengaged by moving the rotating blade in the direction of the tube axis.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, a sedimentation basin 1 has a pit 2 at the bottom center, and a scraping device 3 for scraping settling sludge to the pit 2 is provided in the pond. The scraping device 3 has a drive shaft 4 arranged vertically in the pit 2,
A plurality of scraping plates 5 are provided around the drive shaft 4, and the settled sludge is scraped to the pits 2 by the scraping plate 5 by the rotation of the drive shaft 4.

A sludge pulling pipe 6 for pulling sludge is connected to one end of the pit 2 for communicating with sludge, and a sludge pump 7 is provided at the other end of the sludge pulling pipe 6. Inside the sludge extraction pipe 7, screw blades 8 are arranged along the pipe axis as rotating blades that rotate around the pipe axis. A gear mechanism for transmitting torque is provided between the drive shaft 4 and the rotary shaft 9 of the screw blade 8, and the gear mechanism is provided at one end of the drive gear 10 provided at the lower end of the drive shaft 4 and one end of the rotary shaft 9. Driven gear 11
It consists of:

The screw blade 8 is arranged so as to be able to reciprocate in the axial direction of the tube by holding one end of the rotating shaft 9 with a submerged bearing 12 and holding the other end with a bearing 13 arranged in the middle of the pipeline. I have. A position adjusting device 14 for moving the screw blade 8 in and out of the pipe axial direction is interposed in the middle of the sludge extraction pipe 6. Position adjustment device 14
Has a rack and pinion mechanism, and by moving the screw blade 8 in the axial direction by the rack and pinion mechanism, a driven gear 11 provided on the rotating shaft 9 is formed with respect to a driving gear 10 provided on the driving shaft 4. It moves over a meshing position and a disengaging position.

In the above configuration, the sludge settled in the sedimentation basin 1 is collected in the pit 2 by the rake plate 5 by the rotation of the drive shaft 4 and discharged through the sludge drawing pipe 6 by the driving of the sludge pump 7. In order to prevent the scale from adhering to the sludge extraction pipe 6, the screw blade 8 is driven to rotate by using the driving force of the driving shaft 4 at regular time intervals or at all times.

[0011]

As described above, according to the present invention, the rotating blades disposed inside the sludge withdrawal tube are rotated by using the power existing in the sedimentation basin, so that the cake in the sludge withdrawal tube is removed. Adhesion and growth can be prevented.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Settling tank 2 Pit 3 Scrape device 4 Drive shaft 5 Scrape plate 6 Sludge extraction pipe 7 Sludge pump 8 Screw blade 9 Rotary shaft 10 Drive gear 11 Follower gear 14 Position adjusting device

Claims (2)

[Claims] 1. A sedimentation basin having a pit at the bottom center and a scraping plate for scraping sedimentary sludge to the pit by rotation about a drive shaft, one end communicating with the pit of the sedimentation basin, and the other end having sludge. In a treatment system comprising a sludge withdrawing pipe for drawing sludge from a sedimentation basin in communication with a pump, a rotating blade rotating around the pipe axis is disposed in the sludge withdrawing pipe along the pipe axis. An apparatus for preventing blockage of a sludge withdrawal pipe, wherein a gear mechanism for transmitting rotational force is interposed between one end of a rotary shaft and a drive shaft. 2. A rotary blade is disposed so as to be able to reciprocate in the direction of the pipe axis, and a position adjusting device for moving the rotary blade in and out of the pipe axis in the middle of the sludge withdrawal pipe is interposed. The driven gear provided on the rotary shaft of the rotary blade with respect to the drive gear provided on the rotary blade moves between a position where the driven blade meshes and a position where the driven blade is disengaged by the movement of the rotary blade in the tube axis direction. The apparatus for preventing a sludge withdrawal pipe according to claim 1.