JPH0737393U - Circum sedimentation tank scum removal device - Google Patents

Abstract

(57) [Summary] [Purpose] The scum floating in the sedimentation basin is transferred to the upstream side of the scum removal box for efficient collection and reliable discharge. [Structure] A circular scum basin 3 is attached to a swivel arm 5 spanning in the radial direction, and a scum draw plate that circulates around the water surface and scrapes scum, and is installed inside the circumference of this sediment basin 3, And a scum removing box for discharging the water down. Further, an axial screw type scum transfer machine 11 is arranged on the upstream side of the scum draw plate. Further, the scum transfer machine 11 is rotationally driven by the support wheel 11G attached to the turning arm 5.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention is equipped with a shaft screw type scum transfer machine on the upstream side of the scum scraping plate, and the shaft screw is rotated by the movement of the scum scraping plate to remove the scum on the upstream side of the scum scraping plate from the scum eliminating box. The present invention relates to a scum removing device for a circular sedimentation basin that is transferred to the side and efficiently removes scum.

[0002]

[Prior art]

 The sludge that has settled at the bottom of the circular sedimentation pond is scraped up and discharged by a chain suspension type (suspension type) sludge scraper. This chain-hanging sludge scraper is equipped with a scum scraper near the water surface, and this sludge scraper and scum scraper are centrally located and driven by a single drive device. There is. Since it is a chain suspension type, the scum elimination box is generally installed on the outer peripheral portion outside the orbit of the chain. In addition, instead of the chain suspension method, there is a method of supporting and driving it on a pillar established in the center of the pond.

[0003]

[Problems to be solved by the device]

 In this way, the scum exclusion box is installed on the inner side surface of the pond that deviates from the circulation path of the chain, and even if scum is collected by the orbital drive of the scum scraper plate, the scum scraper box side is located upstream of the scum scraper plate. Since the surface current does not flow to the scum, scum does not collect on the scum removal box side, resulting in extremely poor discharge efficiency.

The present invention is a scum removing device for a circular sedimentation tank, which aims to transfer scum floating in a sedimentation tank to the upstream side of the scum removal box, efficiently collect it, and surely discharge it. .

[0005]

[Means for Solving the Problems]

 The present invention has been made to achieve the above-mentioned object, and is a scum attracting plate which is attached to a swivel arm extending in a radial direction of a circular sedimentation pond, and which scoops scum around the water surface. In a circular sedimentation tank that is installed inside the circumference of the sedimentation tank and has a scum expulsion box that discharges scum downflow, an axial screw type scum transfer machine is installed on the upstream side of the scum draw plate, and the swivel arm is equipped with The main point is to drive the scum transfer machine to rotate with the support wheels attached.

[0006]

[Work]

 The scum floating on the surface of the sedimentation pond is collected on the entire surface in the width direction by the scum scraping plate that rotates at a set speed, and is arranged upstream of this scum scraping plate and in the circumferential direction. Dynamically driven axial screws generate a surface flow toward the scum exclusion box near the outer circumference of the sedimentation basin, and the surface flow of this axial screw transfers the collecting scum. Therefore, the scum floats on the surface of the water and is drawn to the side of the scum removal box inside the settling basin for efficient discharge.

[0007]

【Example】

 Hereinafter, a scum removing device for a circular sedimentation tank according to the present invention will be described with reference to the illustrated embodiment. In the figure, 1 is a double circle type oxidation ditch, in which an aeration tank 2 is concentrically arranged in the outer periphery and a sedimentation tank 3 is concentrically arranged in the center, and wastewater to be treated flows into the aeration tank 2 in the outer periphery. Then, the sludge mixture that has been subjected to the desired aeration treatment is then guided to the central settling basin 3, and the sludge mixture is separated by static settling / gravity settling in this settling tank, and the solid content ( Sludge) and liquid content (treated water) are separated, and then solid-liquid is sent to each treatment process for post-treatment.

A rotary driving body 4 is arranged at a position above the center of the circular sedimentation basin 3, and a rotary driving body 4 is arranged in the radial direction of the sedimentation basin 3 and horizontally and radially above the water surface of the sedimentation basin. A swivel arm 5 is provided to swivel the sedimentation basin around the central driving body 4 in a circumferential direction at a predetermined speed, and at the water surface position of the swivel arm 5, a scum draw plate 6 is provided. On the bottom, a sludge scraper 7 is suspended and supported by a chain 8 or the like, if necessary.

The scum draw plate 6 is arranged in the radial direction of the settling basin 3, and is rotated in the circling direction in the pond by a driving body 4 via a swivel arm 5, so that the scatter floats on the water surface. The mud is collected by the scum suction plate 6, and the sludge settled on the bottom of the pond is collected by the sludge scraper 7 in the mud collecting pit 9 provided at the center of the tank bottom.

A scum removing box 10 is arranged at the water surface position of the sedimentation pond 3 and at a side surface position inside the pond, and scum floating on the water surface is swung by a swivel arm to swivel the scum scraper plate 6 to collect the scum. At the same time, a water flow is generated on the surface of the pond and on the upstream side of the scum scraping plate, and the scum collected by the scum scraping plate is placed on this water flow and moved to the scum excluding box side and guided into the scum excluding box. , I will discharge it outside the pond.

As shown in FIGS. 1 and 2, the water flow that moves the floating scum to the scum removal box side is on the radial water surface from the center of the pond to the outer peripheral side, and further to the upstream side of the scum draw plate by the axial screw. 11 is arranged, and the axial screw 11 is rotated to generate a water flow.

To rotate the shaft screw 11, a guide wheel 11G is provided at the tip of the shaft screw, and the guide wheel 11G is brought into contact with the peripheral upper surface of the pond 3 or the like, or a guide wheel provided at the lower end of the swivel arm tip is formed. The guide wheel is abutted and supported on the upper surface of the peripheral surface, and this guide wheel is rotated during the revolving operation of the revolving arm, and the shaft screw is rotated by the guide wheel 11G.

When a water flow is generated in the radial direction from the center of the pond to the outer circumference on the water surface on the upstream side of the scum scraper plate by the rotation of the shaft screw 11, the flow velocity is appropriate for the scum transfer to this water flow. Thus, the rotation speed and screw pitch of the axial screw are determined. If the flow velocity of surface water is excessive, it will hinder solid-liquid separation in the sedimentation basin, so it is desirable that the screw diameter be an appropriately small diameter.

Further, when the center of rotation of the guide wheel 11G that gives the rotational driving force to the shaft screw is at the position directly above the water surface, the position of the screw shaft is at the same height, and the screw portion is submerged in water even with a screw having a small outer diameter. The water surface velocity is obtained. In addition, the flow velocity on the water surface can be set and adjusted to be suitable for the rotation speed of the shaft screw.

[0015]

[Effect of device]

 The scum removing device of the circular sedimentation basin according to the present invention is attached to the radial arm of the circular sedimentation basin, and a scum rake plate that circulates around the water surface and scrapes up the scum, and the inner circumference of the sedimentation basin. In a circular sedimentation basin equipped with a scum removing box that discharges scum downward, a shaft screw type scum transfer machine is installed upstream of the scum draw plate, and a support wheel is attached to the swivel arm. Since the scum transfer machine is driven to rotate, the scum floating on the surface of the water does not settle down, but is collected accurately by the scum draw plate, and furthermore, by the shaft screw that turns / turns by turning the turning arm. There is an advantage that a water flow is generated on the water surface on the upstream side of the scum draw plate, and this water flow is transported to the scum removal box side and can be efficiently discharged.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an embodiment of a scum removing device for a circular sedimentation tank according to the present invention.

FIG. 2 is a plan view of the same.

FIG. 3 is a plan view showing the whole form of an embodiment of the present invention.

[Explanation of symbols]

 1 Oxidation Ditch 2 Aeration Tank 3 Settling Tank 4 Driver 5 Swiveling Arm 6 Scum Scratch Plate 7 Sludge Scratcher 10 Scum Exclusion Box 11 Axle Screw 11G Guide Wheel

Claims (1)

[Scope of utility model registration request] 1. A scum scraping plate that is attached to a swivel arm that spans the radial direction of a circular sedimentation basin and circulates over the water surface to scrape up scum, and is installed inside the circumference of this sedimentation basin and flows down the scum. In a circular sedimentation basin equipped with a scum removal box for discharging, an axial screw type scum transfer machine is arranged on the upstream side of the scum draw plate, and the scum transfer machine is rotated by a support wheel attached to a revolving arm. Driven circular settling scum removal device.