JP2002307091A - Cleaning method of diffuser - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cleaning method of diffuser, which can easily remove dry and deposited foreign matter by making a water to be flow backward into an air diffusion pipe. SOLUTION: In this diffuser, a gas for diffusion is jetted into the water to be treated by diffusion in a reaction tank 1 from a plurality of jet ports 3 at the bottom of the air diffusion pipe 2 immersed in the tank 1. After stopping diffusion, the water to be treated is made to flow backward into the air diffusion pipe 2 from a tip opening 4 of the air diffusion pipe 2 bent downward and each jet port 3. The influent water humidifies the foreign matter dry and deposited in the vicinity of each jet port 3. Then, diffusion is restarted, and the water to be treated in the air diffusion pipe 2 is discharged from the tip opening 4, and the humidified foreign matter is removed by the sweeping stream of the water to be treated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for cleaning an air diffuser, and more particularly to a method for water treatment in sewage treatment, water purification, landfill leachate treatment, industrial wastewater treatment, turbidity of various types of suspended water, combined clarification tanks, and solids concentration treatment. The present invention relates to an aeration technique used in a processing apparatus.

[0002]

2. Description of the Related Art As the simplest type of conventional diffuser, a diffuser having a plurality of injection holes formed in a pipe is widely used. Also, in order to discharge foreign substances flowing into the diffuser at the start of the diffuser, the distal end of the diffuser is bent downward,
In addition, a diffuser tube having an opening larger than the ejection port at its tip is used.

[0003]

However, even if the air diffuser tube has an opening for discharging foreign matter at the end as described above, if it is used for air diffusion continuously for a long period of time, the vicinity of the ejection port will be located from the inside of the tube. Foreign matter is gradually dried and deposited, and finally the jet port is closed. Even if the ejection port is closed, the air pressure in the air diffuser does not increase because the tip is open, and the pressure for removing foreign matter deposited near the ejection port is hard to work. For this reason, in this type of air diffuser, the clogging of the jet port tends to proceed more easily during long-time continuous use in a high-concentration solution.

A blower connected to an air supply pipe for supplying air to an air diffuser is often provided with a check valve on the discharge side for the purpose of protecting the blower. May not fall.

The present invention solves the above-mentioned problem, and provides a method for cleaning an air diffuser in which foreign matter deposited and deposited can be easily removed by backflowing water to be diffused into an air diffuser. The purpose is to:

[0006]

According to a first aspect of the present invention, there is provided a method for cleaning an air diffuser, comprising the steps of: In the diffuser that blows out the gas for diffusion into the water to be diffused in the tank, the diffusion is stopped and the water to be diffused flows back into the diffuser from the opening of the tip of the diffuser tube bent downward and each outlet. This influent water moistens foreign matter that has dried and deposited near the spout, resumes air diffusion, discharges water to be diffused from the diffuser pipe from the opening at the tip, and sweeps the moist foreign matter into the water to diffuse. It is to be removed by flow.

[0007] With the above-described structure, the air diffusion is stopped and restarted at predetermined time intervals or intervals to remove foreign matter that has dried and accumulated in the air diffusion pipe by sweeping, thereby preventing or eliminating blockage of the injection port. A stable air diffusing performance can be maintained over a long period of time.

According to a second aspect of the present invention, in the method for cleaning an air diffuser, the valve of the branch nozzle provided in the air supply pipe for supplying air to the air diffuser is opened from the time when the air diffusion is stopped until the time when the air diffusion is restarted. The pressure inside the air diffuser is released to the atmosphere.

With the above configuration, when the pressure inside the diffuser tube decreases due to the stop of the diffuser, the water to be diffused flows into the diffuser tube through the opening at the end and the jet port due to the water pressure.
By opening the valve of the branch nozzle, the pressure in the diffuser pipe is instantaneously reduced to the atmospheric pressure, and the reverse flow of the water to be diffused can be performed smoothly, and a check valve is provided in the air supply pipe. Even if it is, the water in the pipe can be guided to the inside of the pipe together with the stop of the diffusion by releasing the pressure in the pipe to the atmosphere simultaneously with the stop of the diffusion.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, an air diffuser 2 disposed inside a reaction tank 1 has a plurality of ejection ports 3 on a lower side, and a tip side is bent downward so that a tip opening 4 is larger than the ejection port 3. The air diffuser 2 is connected to a blower 6 through an air supply pipe 5. The air supply pipe 5 is provided with a check valve 7 located near the discharge port of the blower 6, and an open / close valve 8 is provided at the top of the pipe. And a branch nozzle 9 is provided. Further, a membrane separation device or the like can be arranged above the air diffuser 2 as needed.

The operation of the above configuration will be described below. During normal air diffusion, the air supplied by the blower 6 is supplied to the air diffuser 2 through the air supply pipe 5, and the air ejected from each of the jet ports 3 of the air diffuser 2 is diffused into the water to be diffused stored in the reaction tank 1. To diffuse.

At the time of cleaning, the blower 6 is stopped to stop the air diffusion, and the check valve 7 is opened to release the internal pressure of the diffusion tube 2 to the atmosphere, thereby reducing the pressure in the tube. When the check valve 7 is not provided, the pressure inside the pipe gradually decreases even if the blower 6 is stopped, but the internal pressure of the air diffuser 2 is instantaneously reduced to the atmospheric pressure by opening the on-off valve 8 of the branch nozzle 9. Can be lowered.

Due to the decrease in the pressure in the pipe, water to be diffused flows back into the diffuser pipe 2 from the distal end opening 4 of the diffuser pipe 2 bent downward and each of the jet ports 3. The foreign matter deposited and deposited on the surface is moistened.

After a predetermined time, the blower 6 is driven to resume the air diffusion, the water to be diffused inside the diffuser tube 2 is discharged from the tip opening 4, and the moist foreign matter is removed by sweeping the water to be diffused. I do.
In this way, by stopping and restarting the air diffusion at predetermined time intervals or intervals to remove foreign matter that has dried and accumulated inside the air diffusion tube 2 by sweeping, the obstruction of the ejection port 3 is prevented or eliminated and the air diffusion is prevented. A stable air diffusing performance can be maintained over a period.

[0015]

As described above, according to the present invention, air diffusion is stopped and restarted at predetermined time intervals or intervals to moisten and remove foreign matter deposited and deposited in the air diffusion tube by sweeping. It is possible to prevent or eliminate the clogging of the ejection port, and maintain stable air diffusing performance for a long period of time. By opening the valve of the branch nozzle to instantaneously reduce the pressure in the diffuser tube to the atmospheric pressure, it is possible to stop diffusion and guide the water to be diffused into the tube.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing an air diffuser according to an embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 reaction tank 2 diffuser pipe 3 spout 4 tip opening 5 air supply pipe 6 blower 7 check valve 8 on-off valve 9 branch nozzle

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shinichi Fukuhara 1-47, Shikitsuhigashi 1-chome, Namiwa-ku, Osaka-shi, Osaka (72) Inventor Yusuke Oi Toshikazu Shikitsu, Naniwa-ku, Osaka-shi, Osaka No. 2-47 Kubota Co., Ltd. F-term (reference) 4D029 AA01 AB07 DD01 4D073 AA10 BB01 CC02 CC13 4G035 AB07 AC26 AE13 4G037 DA14

Claims (2)

[Claims] 1. A diffuser for discharging gas for diffusion from a plurality of outlets below a diffuser pipe immersed in a reaction tank to water to be diffused in the tank. The water to be diffused flows back into the air diffuser from the tip opening of the bent air diffuser and each of the air outlets, and the inflow water wets the foreign matter deposited and deposited near the air outlet. A method for cleaning an air diffuser, comprising discharging water to be diffused from a distal end opening and removing moist foreign matter by sweeping the water to be diffused. 2. The method according to claim 1, wherein a valve of a branch nozzle provided in an air supply pipe for supplying air to the air diffuser is opened to release the pressure in the air diffuser to the atmosphere during a period from the stop of the air diffusion to the restart of the air diffusion. The method for cleaning an air diffuser according to claim 1.