JPH08309107A - Removing device for scum of circular sedimentation basin - Google Patents

Abstract

PURPOSE: To provide a removing device for scum of a circular sedimentation basin in which a sink-and-float type scum barrier plate is equipped in the radial direction from the scum box of the circular sedimentation basin to a center well and the scum barrier plate is sunk when a scum scraping plate is passed and floating scum is surely scraped and recovered into the scum box and discharged. CONSTITUTION: This removing device for scum of a circular sedimentation basin is constituted of a central driving type scum scraper provided in the circular sedimentation basin 7 and a sink-and-float type scum barrier plate 5 which is provided from a scum box 3 to a center well 4 and inhibits floating scum. The circular sedimentation basin 7 is equipped with the center well 4 in the center and with the scum box 3 for discharging scum in the end of the basin. Furthermore, the shape of the scum barrier plate 5 is tilted, so that it becomes low on the scraping-up side by the scum scraper and becomes high on the scraping-off side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scum removing device for a circular sedimentation tank, which reliably discharges scum floating in the circular sedimentation tank with a scum scraper. It is about.

[0002]

2. Description of the Related Art When biologically treating sewage, organic matter in the sewage is abnormally proliferated, but scum is generated by actinomycetes and the like, which floats on the surface of a treatment tank, for example, a sedimentation tank and deteriorates the water quality. If the scum rots, it may cause an offensive odor. In order to prevent this, a scum scraper is arranged in the sedimentation tank, and the floating scum is scraped by the drive of the scum scraper and discharged to the outside of the tank.

[0003]

At present, a center well is provided at the center of a general circular final sedimentation basin and scum boxes for discharging scum are provided at the edge of the basin. Also, scum and floating substances floating on the water surface can be collected by a scum scraper, but most scum only moves together with the scum scraper along the water surface, scumming all scum collected. It cannot be guided to the box and collected, and most of the scum passes through the scum box and center well and floats on the water surface. Therefore, scum discharge is inefficient.

The present invention is provided with a floating / sink type scum blocking plate in the radial direction from the scum box of the circular sedimentation tank to the center well. When the scum draw plate passes, it sinks the scum plate to collect and collect the floating scum securely. The purpose is to collect and discharge in the box.

[0005]

The present invention has been made to achieve the above object, and is a central drive type in which a center well is provided in the center and a circular sedimentation basin provided with a scum box for discharging scum at the pond end is provided. It consists of a scum scraper of the type and a float-sink type scum baffle that is placed from the scum box to the center well to prevent floating scum. The scum baffle plate has buoyancy, and when the scum baffle plate passes over the scum baffle plate, the scum baffle plate scrubs the scum baffle plate. Squeeze plate was attached tangentially to the center well so that the plate was held down and submerged in water. That is the summary.

[0006]

[Operation] Since a scum baffle plate is placed between the center well in the center of the circular sedimentation pond and the scum box for scum discharge provided with the edge of the pond, the scum suction plate rotates to float on the water surface. The scum present is prevented from rotating together with the scum crawler plate, is reliably collected between the scum crawler plate and the baffle plate, and is collected in the scum box. Further, since the scum baffle plate is a float-sink type having buoyancy, it does not settle when passing through the scum plate, does not interfere with the movement of the scrap plate, and the scum can be collected, collected and discharged smoothly and easily.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A scum removing device for a circular sedimentation basin according to the present invention will be described below with reference to the embodiments shown in the drawings. 1 in the figure
Is a scum attracting plate which is driven in the center of the circular sedimentation tank 7 and is arranged so as to make a circular motion. The scum attracting plate 1 is opposed to the center well 4 arranged at the center of the circular sedimentation tank 7. It is attached tangentially to a straight line or is curved in an arc shape so that when the scum draw plate 1 is rotated, the scum is scraped later in the outer peripheral part than in the central part of the sedimentation basin.

A scum box 3 for discharging scum is arranged on a part of the end of the circular sedimentation basin 7, for example, a part of the inner surface of the basin. The scum box 3 has an opening on the upstream side as shown so that scum or floating matter 2 floating on the water surface is collected by the rotation of the scum crawler plate 1 and smoothly guided into the scum box.

A scum baffle plate 5 is disposed between the center well 4 of the circular sedimentation tank 7 and the scum box 2.
Moreover, the outer end of the scum baffle plate 5, that is, the outer peripheral end side of the circular sedimentation basin is aligned with the opening position of the scum box so that the scum blocked by the scum baffle plate can be surely guided to the scum box. To do.

The scum baffle plate 5 has a buoyant force and is installed in a floating and sinking manner so that the top of the scum baffle plate 5 floats on the water surface by a laying weight 6, but the position between the center well and the scum box does not change. That is, it is designed to maintain a fixed position.

Since the scum baffle plate 5 is of a floating and sinking type, when the scum baffle plate 1 passes through the position of the scum baffle plate, the scum baffle plate 5 is restrained and settled so as not to interfere with its movement. There is. Therefore, the top surface of the scum baffle plate 5 is lowered on the inner peripheral side of the circular sedimentation tank, that is, the center well side, as shown in FIG. In addition, the side surface of the scum baffle plate is inclined at least from the bottom to the top on the side where the scum draw plate approaches, so that the scum scraper that approaches the scum baffle plate is inclined. Make it easy to push down the scum baffle on the underside of the sideboard.

Further, the scum baffle plate 5 has a triangular cross section as shown in FIG. 3 and is of a float type having a weight 6 at its lower portion, and also has various shapes as shown in FIG. can do. Thus, by tilting the side surface of the scum baffle plate so that the scraping side is low and the scraping side is high, the scum baffle plate can be gradually submerged when passing through the scraping plate, and the scum baffle plate Perform smooth orbital exercises.

Therefore, in the scum removing device for a circular sedimentation tank constructed as described above, when the scum attracting plate 1 is rotated, scum floating on the water surface of the sedimentation tank is attracted by this scum attracting plate. And move with the scratch board. At the position of the scum baffle, the scum is dammed, moved along the side surface of the scum baffle from the center of the sedimentation basin to the outer peripheral direction, and is guided into the scum box and collected. When the scum draw plate 1 further rotates, the scum draw plate 1 is pushed down against the buoyant force on the lower surface of the scum draw plate 1 as shown in FIG. Then, after the scum blocking plate completely rides over the scum baffle, the buoyancy causes the scum baffle to levitate again to prevent the scum from flowing downstream from the scum box.

[0014]

The scum removing device for a circular sedimentation tank according to the present invention is provided with respect to a scum scraping plate that makes a circular motion in a circular sedimentation tank.
Since the scum baffle plate is inclined in the radial direction of the settling tank so that the scratching side becomes lower, scum floating on the water surface is collected by the scum baffle plate and the scum baffle plate prevents its accompanying movement and scumming. It can be guided to the box side and collected reliably. Since the scum baffle plate is provided with buoyancy, it can be submerged by suppressing it when the scum draw plate passes, so that the scum can be collected without obstructing the passage of the scum draw plate. Since the scum draw plate is provided tangentially to the center well, the floating scum can be easily collected on the scum box side.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of a scum removing device for a circular sedimentation basin of the present invention.

FIG. 2 is a longitudinal sectional view of the same.

FIG. 3 is an operation explanatory diagram when the scum draw plate rides over the scum baffle plate.

FIG. 4 is a cross-sectional view of another embodiment of the scum baffle plate.

FIG. 5 is a plan view of a known example.

[Explanation of symbols]

 1 Scum draw plate 2 Float 3 Scum box 4 Center well 5 Scum baffle plate 6 Weight 7 Circular sedimentation tank 8 Introducing pipe from aeration tank

Claims (4)

[Claims] 1. A center drive type scum scraper provided in a circular sedimentation basin equipped with a center well in the center and a scum box for discharging scum at the edge of the pond, and a scoop box arranged from the scum box to the center well for floating. It consists of a float-sink type scum baffle plate that prevents the scum of the scum, and the shape of this scum baffle plate is inclined so that it is lower on the scratching side by the scum scraper and higher on the scraping side. Circular sedimentation tank scum removal device. 2. The scum baffle plate has a buoyancy force, and when the scum baffle plate passes over the scum baffle plate, the scum baffle plate holds the scum baffle plate downward to submerge it. Claim 1
A scum removal device for the circular sedimentation tank described. 3. The circular sedimentation basin according to claim 1, wherein the scum scraping plate is attached tangentially to the center well so that the scum can be scraped with a delay in the outer peripheral portion from the central portion of the sedimentation basin. Scum removal device. 4. The scum removal of a circular settling basin according to claim 1, wherein the scum scraping plate has an arcuate shape with respect to the center well, and the scum is scraped toward the outer peripheral portion later than the central part of the sedimentation basin. apparatus.