JPH06238290A - Screen device - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide an inexpensive screen device by eliminating clogging of the screen. [Structure] An air diffuser 24 is arranged below the screen 22, and a chain 26 is arranged in a state substantially equilibrium with the screen 22. Brushes 27 constituting a cleaning means are attached to the chain 26 at regular intervals. The chain 26 having the brush 27 is connected to an air pipe 29 branched from a main air pipe 28 by an air motor 30. It is configured to be rotationally driven.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screen device, and more particularly, to a screen device provided with a fine screen, a foreign matter pushing-out cleaning means, and a screen lower air diffusing means.

[0002]

2. Description of the Related Art A screen device already proposed in the past will be described with reference to FIG. The biological reaction tank 1 and the circulating water channel (or the outflow channel) 2 are separated by a wall 3 and a screen 4 having an inclined fine mesh, and an aeration device 5 is arranged below the screen 4. The air diffuser 5 is a main air pipe 6
Is connected to the first air pipe 7 branched by. Further, the second air pipe 8 branched from the main air pipe 6 has an air diffuser disk 9 arranged at the bottom of the biological reaction tank 1.
Are connected. The biological reaction tank 1 is a deodorant cover 1
It is covered with 0.

The biological reaction tank 1 fluidizes a carrier 11 to which microorganisms are adhered or immobilized in the tank 1 to obtain the carrier 11
By the action of the microorganisms, the inflowing wastewater is purified. Then, the water purified in the biological reaction tank 1 is discharged to the outside of the tank 1, but the carrier 11 needs to be always fluidized in the tank 1 and is not allowed to flow to the outside. Therefore, the screen 4 is arranged at the outflow portion of the water (reaction liquid) 12,
The carrier 11 is prevented from flowing out.

[0004]

On the other hand, contaminants 13 such as hair are mixed in the sewage 12 to be treated, and if these contaminants 13 flow out through the eyes of the screen 4 together with the water 12. Although good, some of them are caught in the screen 4 and cause clogging of the screen 4. If this clogging occurs, it becomes impossible to properly control the flow rate in the biological reaction tank 1, which causes various troubles in processing. That is, since the amount of water 12 passing through varies depending on the clogging of the screen 4, it is necessary to eject a huge amount of air from the air diffuser 5 so as to cope with the worst situation, resulting in energy loss. . In addition, air bubbles are often generated in the initial stage of operation, and the air amount needs to be controlled at each stage. If not properly controlled, manual cleaning is required to clear the clogging and the biotreatment performance is degraded.

On the other hand, FIG. 3 shows another example of the conventional screen device, in which the carrying-out device 14 for the impurities 13 is provided substantially parallel to the screen 4 having the inclined fine mesh.
In this structure, there is a problem that equipment cost is high because a means for driving the carry-out device 14 is required in addition to the carry-out device 14. In FIG. 3, the same parts as those in FIG. 2 are designated by the same reference numerals and the description thereof will be omitted.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and to eliminate the clogging of the screen and to provide an inexpensive screen device.

[0007]

In order to achieve the above object, the screen device of the present invention has a screen placed at the outflow portion or the circulation portion of the reaction liquid of the equipment for biological treatment, in which the carrier is put into the biological reaction tank. In the arranged screen device, a cleaning means for pushing out contaminants adhering to the screen from the screen, a drive means for moving the cleaning means, and an aeration means for circulating the pushed-out contaminants into the biological reaction tank. Is provided with.

[0008]

As described above, according to the present invention, the contaminants adhering to the screen are pushed out of the screen by the cleaning means and simultaneously returned to the biological reaction tank by the aeration means,
At the next opportunity, I try to slip it out of the screen and let it flow out of the tank. This prevents clogging of the screen with a simple structure.

[0009]

The present invention will be described in detail below with reference to the embodiments shown in the drawings. FIG. 1 is a schematic configuration diagram showing an embodiment of a screen device according to the present invention. The biological reaction tank 20 and the circulating water channel (or outflow channel) 21 are separated by a screen 22 and a wall 23 each having an inclined fine mesh. The screen 22
An air diffuser 24 is arranged in the lower part of the above, and an air diffuser disk 25 is arranged in the lower part of the biological reaction tank 20. Further, a chain 26 which is in an endless shape in a state substantially parallel to the screen 22 is arranged, and brushes 27 constituting a cleaning means are mounted on the chain 26 at regular intervals. The chain 26 provided with the brush 27, the chain 26 provided with the main air pipe 27,
It is configured to be rotationally driven by a motor 30 connected to an air pipe 29 branched from the main air pipe 28. Further, the air motor 30 is connected to the air diffuser 24 via an air pipe 31, so that the outflow air from the air motor 30 is sent to the air diffuser 24 and is injected into the biological reaction tank 20. Has become. The main air pipe 28 is connected to the diffuser disk 25 via an air pipe 32.

Next, the operation of the screen device constructed as above will be described. First, the outflow of water (reaction liquid) 33 from the biological reaction tank 20 into the circulation water channel (or outflow water channel) 21 is performed by the water level difference H. The water (reaction liquid) 33
As the water (reaction liquid) 33 passes through the screen 22, the contaminants 34 and the carrier 35 adhere to the upstream side of the screen 22, but the majority of the contaminants 34 and the carrier 35 are arranged in the lower part of the screen 22. It is separated from the screen 22 by the air blown from the air diffuser 24. On the other hand, the foreign matter 34 and the carrier 35 accumulated between the mesh widths of the screen 22.
Are extruded to the upstream side of the screen 22 by the brush 27 attached to the chain 26, separated by the screen 22, and returned into the biological reaction tank 20 again. Then, such an operation is repeated until the contaminant 34 passes through the eyes of the screen 22 and flows out of the biological reaction tank 20.

As described above, according to the present embodiment, the clogging of the screen 22 can be realized with a simple structure, but in addition, the air diffuser 24 disposed under the screen 22 and the air trachea 28 are diffused. Since the chain 26 having the brush 27 can be rotationally moved using the air jetted from the device 24, there is an effect that the efficiency of energy use can be improved.

In the above-mentioned embodiment, the brush 2
Although 7 has a structure attached to the chain 26, it is not limited to such a structure, and it goes without saying that a cylinder type in which a brush is attached to the tip of the cylinder may be used.

[0013]

As described above, according to the present invention, cleaning means for pushing out contaminants adhering to the screen from the screen, driving means for moving the cleaning means, and recycling of the pushed-out contaminants into the biological reaction tank. The diffusing means is provided to allow foreign matters adhering to the screen to be pushed out from the screen by the cleaning means and at the same time separated from the screen by the diffusing means and returned to the biological reaction tank again. Therefore, there is an excellent effect that the clogging of the screen can be reliably prevented with a simpler device configuration than the conventional one.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of a screen device according to the present invention.

FIG. 2 is a schematic configuration diagram showing an example of a conventional screen device.

FIG. 3 is a schematic configuration diagram showing another example of a conventional screen device.

[Explanation of symbols]

 20 Biological Reaction Tank 21 Circulation Channel (or Outflow Channel) 22 Screen 24 Air Diffuser 26 Chain 27 Brush 30 Air Motor 33 Water (Reaction Liquid) 34 Contaminants 35 Carrier

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Office reference number FI technical display location E02B 15/10 ZAB Z 9231-2D // E02B 5/08 101 Z 9320-2D

Claims (1)

[Claims] 1. A cleaning device for charging a carrier into a biological reaction tank and arranging the reaction solution outflow portion or circulation portion of a facility for biological treatment in a screen device for pushing out contaminants adhering to the screen from the screen, A screen device comprising: a drive unit that moves the cleaning unit; and an air diffuser that circulates the pushed contaminants into the biological reaction tank.