JP6918667B2 - Cleaning method of air diffuser and air diffuser - Google Patents

Description

The present invention relates to a method for cleaning an air diffuser and an air diffuser.

In recent years, as a treatment of wastewater such as industrial wastewater and domestic wastewater, a water tank filled with a liquid to be treated containing activated sludge, a membrane module arranged in the water tank, and an air diffuser pipe arranged below the membrane module have been provided. Various treatments by the membrane separation activated sludge method (MBR) using the provided water treatment apparatus have been studied. In the treatment by MBR, the liquid to be treated is solid-liquid separated by the membrane module to obtain treated water having high water quality.

In MBR, when the solid-liquid separation of the liquid to be treated is continuously performed by the membrane module, the surface of the separation membrane disposed on the membrane module is clogged with the suspended substance, and the intermembrane differential pressure of the membrane module increases. , The amount of treated water per unit time obtained by solid-liquid separation by the membrane module decreases. Therefore, in the MBR, bubbles are generated by aerating gas from an aeration tube arranged below the membrane module, and the gas-liquid mixed flow of the bubbles formed by the rise of the bubbles and the liquid to be treated is separated. Solid-liquid separation is performed while cleaning to remove suspended substances such as sludge adhering to the surface of the separation membrane by bringing it into contact with the surface of the membrane.

In such an MBR, as the treatment was continued, sludge in the water tank may gradually enter the air diffuser pipe and dry out to form deposits. This deposit causes obstruction of the air diffuser and destabilization of air diffuser. When the air diffused from the air diffuser becomes unstable, it becomes difficult to sufficiently bring the gas-liquid mixed flow containing air bubbles into contact with the surface of the separation membrane, and the suspended solids adhering to the surface of the separation membrane are sufficiently removed. Will not be. As a result, the differential pressure between the membranes of the membrane module increases, and the amount of treated water per unit time obtained by solid-liquid separation by the membrane module decreases.
In response to this problem, conventionally, cleaning has been performed by pulling up the air diffuser pipe from the inside of the water tank to remove the deposits accumulated on the air diffuser pipe. However, the cleaning method in which the air diffuser is pulled up for cleaning is time-consuming and increases the cleaning cost. In particular, when cleaning the air diffuser of a device in which the air diffuser and the membrane module are integrated, it is necessary to pull the device itself out of the water tank, which increases the time and cleaning cost required for cleaning the air diffuser.

Patent Document 1 describes in an air diffuser that supplies air to an air diffuser immersed in a tank from the proximal end side and dissipates air from a plurality of air outlets provided below the air diffuser. The drain valve of the air diffuser drain pipe connected to the tip side of the air diffuser pipe is opened, the air supplied to the air diffuser pipe is exhausted through the air diffuser drain pipe, and the liquid in the tank is discharged from the air outlet into the air diffuser pipe. Disclosed is a technique in which the air diffuser is washed with water by reverse inflowing the air, and the water is washed intermittently by utilizing the pulsation generated by the pressure change in the air diffuser.

Japanese Patent No. 3382926

However, in the technique described in Patent Document 1, the liquid in the tank is less likely to flow into the base end side of the air diffuser pipe, which is the air supply side, as compared with the tip side. Drying of the liquid may progress and cause blockage of the air diffuser holes. Further, in the air diffuser described in Patent Document 1, an air supply pipe is arranged on the base end side of the air diffuser pipe, and an air diffuser drain pipe and a drain valve are arranged on the tip end side of the air diffuser pipe. It is necessary to separately secure a space for installing the drain pipe and the drain valve, which leads to an increase in the size of the device.

The present invention has been made in consideration of the above points, and provides a method for cleaning an air diffuser and an air diffuser capable of suppressing clogging and blockage of an air diffuser without causing an increase in size of the device. With the goal.

The present invention has the following aspects.
[1] A method for cleaning an air diffuser, in which an air diffuser step of supplying air from an air supply pipe to an air diffuser immersed in a water tank and airing air from an air outlet of the air diffuser is performed.
The air supply pipe provided with an air release valve and connected to one end side of the air diffuser pipe,
A step of preparing a discharge pipe provided with an on-off valve and connected to one end side of the air diffuser pipe, and
With the on-off valve closed and the air supply from the air supply pipe stopped, the air release valve is opened to open the inside of the air diffuser pipe to the atmosphere, and the inside of the water tank is opened via the air outlet. The filling process of filling the inside of the air diffuser with liquid,
With the air release valve closed and the on-off valve open, air is supplied from the air supply pipe and sent out to the discharge pipe via one end side of the air diffuser pipe, thereby passing through the air outlet. And the discharge process of discharging the liquid that has flowed into the inside of the air supply pipe through the discharge pipe.
including.
[2] The air diffuser according to the above [1], which includes a first mode in which the air dissipating step is performed after the filling step, and a second mode in which the discharging step and the air dissipating step are sequentially performed after the filling step. Cleaning method.
[3] The method for cleaning an air diffuser according to the above [2], wherein the first mode is performed once a day or more and 24 times or less, with the opening time of the atmospheric release valve being 10 seconds or more each time.
[4] The air diffuser according to the above [2] or [3], wherein in the second mode, the opening time of the on-off valve is 10 seconds or more, and the opening time is performed once every two weeks or more and once a day or less. Cleaning method.
[5] Cleaning of the air diffuser according to any one of [1] to [4], wherein the diameter of the discharge pipe is 1.1 times or more and 2 times or less the diameter of the air supply pipe. Method.
[6] In the air diffuser, the first pipe and the second pipe arranged at intervals extending in the vertical direction and the lower ends of the first pipe and the second pipe are connected to each other, and one end side of the air diffuser is connected. The air supply pipe is formed by having a third pipe connected in the middle, and one side of the first pipe and one side of the third pipe in the length direction with respect to the connection portion of the air diffuser pipe. The other side of the second pipe and the other side of the third pipe in the length direction from the connection portion with the air diffuser pipe is described in any one of the above [1] to the above [5] forming the exhaust pipe. How to clean the air diffuser.
[7] An air diffuser having an air diffuser immersed in a water tank and having an air outlet, which is provided with an air release valve and is connected to one end side of the air diffuser to supply air to the air diffuser. An air diffuser including a trachea and an air diffuser provided with an on-off valve and connected to one end side of the air diffuser so as to be able to discharge the liquid flowing into the air diffuser.
[8] A first pipe and a second pipe that extend in the vertical direction and are arranged at intervals, and the lower ends of the first pipe and the second pipe are connected to each other, and one end side of the air diffuser pipe is connected halfway. The first pipe and one side of the third pipe in the length direction with respect to the connection portion of the third pipe form the air supply pipe, and the second pipe and the second pipe and the air supply pipe are formed. The air diffuser according to the above [7], wherein the other side of the third pipe in the length direction from the connection portion with the air diffuser is the exhaust pipe.
[9] With the on-off valve closed and the air supply from the air supply pipe stopped, the air release valve is opened to open the inside of the air diffuser pipe to the atmosphere, and the air outlet is used to open the inside of the air diffuser. After filling the inside of the air diffuser with the liquid in the water tank, air is supplied from the air supply pipe in a state where the air release valve is closed and the on-off valve is open, and air is supplied from the air supply pipe through one end side of the air diffuser. The above [7] or the above [8], which has a control unit for discharging the liquid that has flowed into the inside of the air supply pipe through the air outlet by sending it to the discharge pipe. Air diffuser.
[10] The control unit opens the inside of the air diffuser pipe to the atmosphere, fills the inside of the air diffuser pipe with the liquid in the water tank, and then supplies air to the air diffuser pipe from the air supply pipe to inject the air. In the first mode in which air is dissipated from the outlet, the inside of the air diffuser is opened to the atmosphere, the liquid in the water tank is filled in the air diffuser, and then air is supplied from the air supply pipe to the air diffuser. The liquid that has flowed into the air supply pipe through the air outlet is discharged through the discharge pipe by delivering the liquid to the discharge pipe via one end side of the air outlet, and then the air supply pipe is discharged to the air diffuser. The air diffuser according to the above [9], which has a second mode in which air is supplied from the air outlet and air is diffused from the air outlet.

According to the present invention, it is possible to suppress clogging and blockage of the air diffuser pipe without causing an increase in size of the device.

It is a schematic block diagram of the water treatment apparatus 1 provided with the air diffuser 30 of one Embodiment of this invention. It is a front view which shows a part of an air diffuser pipe 13, an air supply pipe 31 and a discharge pipe 41. It is a right side view of FIG. It is a block diagram which concerns on the control of the air diffuser 30.

Hereinafter, a method for cleaning the air diffuser and an embodiment of the air diffuser of the present invention will be described with reference to FIGS. 1 to 4.
It should be noted that the following embodiments show one aspect of the present invention, do not limit the present invention, and can be arbitrarily changed within the scope of the technical idea of the present invention. Further, in the following drawings, in order to make each configuration easy to understand, the scale and number of each structure are different from the actual structure.

FIG. 1 is a schematic configuration diagram of a water treatment device 1 including an air diffuser 30 according to an embodiment of the present invention.
The water treatment device 1 is a water treatment device by the membrane separation activated sludge method.
The water treatment device 1 of this embodiment includes a water tank 11, a membrane module 12 arranged in the water tank 11, a treated water discharge pipe 15 for discharging the treated water separated by the membrane module 12, and a lower portion of the membrane module 11. It is provided with an air diffuser 30 for dissipating air bubbles from the air, and a control unit CONT (see FIG. 4).

<Aquarium 11>
As an example, the water tank 11 is a tank in which a liquid to be treated such as industrial wastewater is biologically treated by the action of activated sludge to be treated as biologically treated water. The water tank 11 is not particularly limited, but is, for example, a rectangular parallelepiped, and the depth is preferably more than 1 m so that the water depth of the liquid to be treated is 1 m or more.
A drainage supply pipe (not shown) for supplying drainage from a raw water tank (not shown) in which drainage is stored is connected to the water tank 11.
The membrane module 12 is arranged in the water tank 11. The water tank 11 is filled with a liquid to be treated containing activated sludge, and activated sludge treatment (biological treatment) is performed by the dust generated by the air diffuser 30. The biologically treated treated water is solid-liquid separated by the membrane module 12.

<Membrane module 12>
The membrane module 12 is arranged in the water tank 11. A treated water discharge pipe 15 is connected to the membrane module 12.
The treated water discharge pipe 15 is provided with a suction pump 17 in the middle of the flow path thereof. The suction pump 17 depressurizes the inside of the membrane module 12 and separates the activated sludge and the treated water (permeated water) into solid and liquid. Further, the treated water is discharged to the outside of the water tank 11 through the treated water discharge pipe 15.

As the membrane module 12, a known membrane module provided with a known separation membrane (filtration membrane) can be used.
As the type of separation membrane, a microfiltration membrane (MF membrane) or an ultrafiltration membrane (UF membrane) is preferable.
Examples of the shape of the separation membrane include a hollow fiber membrane, a flat membrane, a tubular membrane, and a bag-shaped membrane. Of these, the hollow fiber membrane is preferable because the membrane area can be highly integrated when compared on a volume basis.

Examples of the material of the separation membrane include organic materials (cellulose, polyolefin, polysulfone, polyvinyl alcohol, polymethylmethacrylate, polyvinylidene fluoride, polytetrafluoroethylene, etc.), metals (stainless steel, etc.), and inorganic materials (ceramic, etc.). Be done. The material of the separation membrane is appropriately selected according to the properties of drainage and the like.

The pore size of the separation membrane may be appropriately selected according to the purpose of the treatment. In the MBR, the pore size of the separation membrane is preferably 0.001 to 3 μm. If the pore size is less than 0.001 μm, the resistance of the film tends to increase. If the pore size exceeds 3 μm, sludge cannot be completely separated, so that the quality of treated water (permeated water) may deteriorate. The pore size of the separation membrane is more preferably 0.04 to 1.0 μm, which is in the range of the microfiltration membrane.
One membrane module 12 may be deployed in the water tank 11, or a plurality of membrane modules 12 may be deployed.

<Air diffuser 30>
The air diffuser 30 has an air diffuser 13, an air supply pipe 31 connected to one end side (right side in FIG. 1) of the air diffuser 13, and a discharge pipe 41 connected to one end side of the air diffuser 13. There is.

The air diffuser 13 is not particularly limited. 2 and 3 show an example of the air diffuser 13.
FIG. 2 is a front view showing a part of the air diffuser pipe 13, the air supply pipe 31, and the discharge pipe 41. FIG. 3 is a right side view of FIG.

As shown in FIGS. 2 and 3, the air diffuser pipe 13 includes a main pipe 2 extending in the horizontal direction in which gas is supplied via the air supply pipe 31, and a plurality of branches extending in the horizontal direction directly connected to the main pipe 2. It is provided with a pipe 3. As will be described later, the main pipe 2 is connected to the air supply pipe 31 and the discharge pipe 41 on one end side in the length direction. The other end side of the main pipe 2 is hermetically closed by being covered with the lid 2a without opening.

The main pipe 2 is arranged horizontally, and a vertical pipe portion 6 extending downward from the lower portion thereof is provided so as to communicate with the inside of the main pipe 2. A T-shaped three-way pipe 7 is provided on the lower end side of the vertical pipe portion 6. One end side of the branch pipe 3 is connected to both sides of the three-way pipe 7. The branch pipe 3 is arranged so as to extend in a direction orthogonal to the main pipe 2. One or more air outlets 8 are formed on the lower side of the branch pipe 3. Further, the branch pipe 3 is configured such that the opening 3b at the other end faces downward in the vertical direction while the main pipe 2 is arranged horizontally because the bent portion 3a is formed near the other end. ..

Returning to FIG. 1, the air supply pipe 31 is provided with a blower 32 in the middle of the flow path thereof. Further, an air release valve 33 is provided between the air diffuser pipe 13 and the blower 32 in the air supply pipe 31. The air supply pipe 31 is opened to the atmosphere when the air release valve 33 is opened, and is released to the atmosphere when the air release valve 33 is closed.

The discharge pipe 41 can discharge the liquid that has flowed into the inside of the air diffuser pipe 13. The discharge pipe 41 is provided with an on-off valve 42 in the middle of the flow path thereof. The liquid discharged from the discharge pipe 41 is returned to the water tank 11.

As shown in FIG. 3, the air supply pipe 31 includes a first pipe 51 extending in the vertical direction and a part of a third pipe 53 connected to the lower end of the first pipe 51. The discharge pipe 41 includes a second pipe 52 extending in the vertical direction and a part of the third pipe 53 connected to the lower end of the second pipe 52. The first pipe 51 and the second pipe 52 are arranged at one end side of the air diffuser pipe 13 at intervals in a direction orthogonal to the main pipe 2. The third pipe 53 connects the lower ends of the first pipe 51 and the second pipe 52 to each other. The third pipe 53 is arranged at the same height as the main pipe 2, and one end side of the main pipe 2 is connected in the middle. Therefore, the air supply pipe 31 is formed between the first pipe 51 and the first pipe 51 side of the connection portion between the main pipe 2 of the third pipe 53. Further, a discharge pipe 41 is formed between the second pipe 52 and the second pipe 52 side of the connection portion between the second pipe 52 and the main pipe 2 of the third pipe 53.

FIG. 4 is a block diagram relating to the control of the air diffuser 30.
As shown in FIG. 4, the control unit CONT corresponds to an air diffuser step of air-dissipating air from the air outlet 8 and the opening 3b of the air diffuser pipe 13 or a cleaning step of cleaning the air diffuser pipe 13 separately from the air diffuser step. It also controls the air supply by the blower 32, the opening and closing of the air release valve 33, the drive of the suction pump 17, and the opening and closing of the on-off valve 42.

In the above water treatment device 1, after installing (preparing) the membrane module 12, the air diffuser 30, and the like in the water tank 11, the air diffuser step and the cleaning step are sequentially performed.
As shown in the timing T0 in [Table 1] below, the air dissipating step is performed by the control unit CONT closing the air release valve 33 and the on-off valve 42 and driving (ON) the suction pump 17 and the blower 32. Will be. The air supplied from the blower 32 flows into the inside of the main pipe 2 of the air diffuser pipe 31 through the air supply pipe 31, and is ejected from the air outlet 8 and the opening 3b to be dispersed. When air is ejected from the air ejection port 8 and the opening 3b, the ejected air becomes bubbles and rises in the water tank 11. The raised bubbles form a gas-liquid mixed flow by being accompanied by the liquid to be treated in the water tank 11. This gas-liquid mixed flow peels off suspended solids such as sludge adhering to the surface of each membrane element (not shown) by hitting the membrane module 12.

The cleaning step includes a filling step of opening the inside of the air diffuser pipe 13 to the atmosphere to fill the inside of the water tank 11 with the liquid in the water tank 11, and discharging the liquid flowing into the air diffuser pipe 13 through the discharge pipe 41. Includes discharge process. More specifically, the control unit CONT has a first mode in which the filling process is performed after the air dissipating step and then the air dissipating step, and a filling step and the discharging process are performed after the air dissipating step, and then. The second mode in which the air diffusion process is performed is switched at a preset frequency. Hereinafter, the filling process, the discharging process, the first mode and the second mode will be described with reference to [Table 1] and [Table 2].

<Filling process>
In the filling step, as shown in the timing T1 in the above [Table 1], the air release valve 33 is opened with the control unit CONT closed the on-off valve 42, and the drive of the suction pump 17 and the blower 32 is stopped (OFF). ) Is done. By stopping the drive of the blower 32, the supply of air to the inside of the air diffuser pipe 13 via the air supply pipe 31 is stopped. Further, by opening the air release valve 33, the inside of the air diffuser pipe 13 is opened to the atmosphere. As a result, the liquid in the water tank 11 containing sludge flows into and fills the inside of the air diffuser pipe 13 through the air outlet 8 and the opening 3b.

In the first mode, as shown in [Table 1], when the filling step of the timing T1 is completed, the aeration step described above is restarted at the timing T2. Since the inside of the air diffuser pipe 13 is filled with liquid at the start of the air diffuser process at the timing T2, the deposits accumulated in the main pipe 2 and the like can be kept in a wet state. Further, when the air diffusion is restarted, the wet deposits in the main pipe 2 can be easily discharged from the air outlet 8 by the air from the blower 32.

In the first mode, for example, the opening time of the atmospheric release valve 33 is 10 seconds or more each time, and the first mode is performed once a day or more and 24 times or less. If the opening time of the air release valve 33 is less than 10 seconds each time, there is a possibility that the inflow of the liquid including sludge into the inside of the air diffuser 13 is insufficient, but 10 seconds each time. By doing so, it becomes possible to fill the inside of the air diffuser 13 with a liquid containing sludge. If the first mode is less than once a day, there is a possibility that the air diffuser pipe 13 is not sufficiently cleaned and the deposits accumulated in the main pipe 2 and the like cannot be sufficiently discharged. Further, when the first mode is performed more than 24 times a day, the water treatment efficiency may decrease. Therefore, the frequency of performing the first mode is preferably in the above range.

<Discharge process>
In the discharge step, as shown in the timing T2 in the above [Table 2], after the timing T0 (air diffusion step) and the timing T1 (filling step) described above, the control unit CONT closes the air release valve 33. This is performed by opening the on-off valve 42 and driving (ON) the blower 32 with the suction pump 17 stopped.

When the on-off valve 42 is opened to drive the blower 32, a liquid containing sludge that has entered the air supply pipe 31 from the inside of the air diffuser pipe 13 when the air release valve 33 is opened at the timing T1 is supplied from the blower 32 and the pressure of the air. Is sent to the discharge pipe 41. Since the air supply pipe 31 and the discharge pipe 41 are connected to one end side of the air diffuser pipe 13 in the third pipe 53, the air diffuser pipe is sent as the liquid containing sludge in the air supply pipe 31 is sent to the discharge pipe 41. The liquid containing sludge in 13 is sent from one end side to the discharge pipe 41, discharged, and returned to the water tank 11. As the liquid containing sludge in the air diffuser 13 is discharged, the liquid containing sludge in the water tank 11 flows into the air diffuser 13 through the air outlet 8 and the opening 3b, and is discharged from one end side. It is sent to 41 and returned to the water tank 11.

In the second mode, as shown in [Table 2], when the discharge step of the timing T2 is completed, the air diffusion step described above is restarted at the timing T3. Even at the start of the air diffuser process at the timing T3, since the inside of the air diffuser pipe 13 is filled with a liquid containing sludge, the deposits accumulated in the main pipe 2 and the like can be kept in a wet state. Further, when the air diffusion is restarted, the wet deposits in the main pipe 2 can be easily discharged from the air outlet 8 by the air from the blower 32.

In the second mode, for example, the opening time of the on-off valve 42 is 10 seconds or more at a time, and is performed once every two weeks or more and once a day or less. If the opening time of the on-off valve 42 is less than 10 seconds at a time, the liquid inside the air diffuser 13 may be insufficiently discharged. It is possible to sufficiently discharge the liquid containing sludge inside the. If the second mode is less than once every two weeks, there is a possibility that the air diffuser pipe 13 is not sufficiently cleaned and the deposits accumulated in the main pipe 2 and the like cannot be sufficiently discharged. Further, if the second mode is performed more than once a day, the water treatment efficiency may decrease. Therefore, the frequency of performing the second mode is preferably in the above range.

The pipe diameter of the second pipe 52 (discharge pipe 41) is preferably 1.1 times or more and 2 times or less the pipe diameter of the first pipe 51 (air supply pipe 31). When the pipe diameter of the second pipe 52 is less than 1.1 times the pipe diameter of the first pipe 51, the air supplied through the first pipe 51 is used to fill the air diffuser pipe 13 with a liquid containing sludge. 2 It may be difficult to discharge smoothly through the pipe 52. If the pipe diameter of the second pipe 52 exceeds twice the pipe diameter of the first pipe 51, the size of the device will be increased. In order to smoothly discharge the liquid containing sludge filled in the air diffuser pipe 13 through the second pipe 52 without inviting an increase in size of the apparatus, the pipe diameter of the second pipe 52 is the pipe of the first pipe 51. It is preferably in the above range with respect to the diameter.

As described above, in the present embodiment, after the inside of the air diffuser pipe 13 is opened to the atmosphere and the inside is filled with the liquid, the liquid inside the air diffuser pipe 13 is discharged through the discharge pipe 41. Therefore, the air diffuser pipe is discharged. It is possible to prevent the liquid in 13 from drying. Therefore, in the present embodiment, clogging and blockage of the air diffuser 13 can be effectively suppressed. Further, in the present embodiment, since both the air supply pipe 31 and the discharge pipe 41 are arranged on one side of the air diffuser pipe 13, the installation space is compared with the case where the discharge pipe 41 is arranged on a side different from the air supply pipe 31. Can be made smaller and the size of the device can be suppressed. In addition, in the present embodiment, since the liquid discharged through the discharge pipe 41 is returned to the water tank 11 for water treatment, it is not necessary to separately provide a device for storing or treating the discharged liquid. It is possible to suppress the increase in size and price.

Further, in the present embodiment, since the air supply pipe 31 and the discharge pipe 41 are directly connected, the liquid containing sludge in the discharge pipe 41 can be effectively discharged by the air supplied through the air supply pipe 31. It will be possible. Therefore, in the present embodiment, even when the sludge viscosity of the liquid containing sludge is high (for example, 12,000 mg / L or more in MLSS (Mixed Liquor Suspended Solids)), the discharge pipe 41 can be used without any problem. Can be discharged through.

Although the preferred embodiments according to the present invention have been described above with reference to the accompanying drawings, it goes without saying that the present invention is not limited to the above examples. The various shapes and combinations of the constituent members shown in the above-mentioned examples are examples, and can be variously changed based on design requirements and the like within a range that does not deviate from the gist of the present invention.

For example, in the above embodiment, the configuration in which the air supply pipe 31 and the discharge pipe 41 are directly connected and the air diffuser pipe 13 is connected to the connection portion between the air supply pipe 31 and the discharge pipe 41 is illustrated, but the configuration is not limited to this configuration. For example, the air supply pipe 31 may be connected to one side in the direction orthogonal to the length direction and the discharge pipe 41 may be connected to the other side in the middle of the length direction of the air diffuser pipe 13.

Further, in the above embodiment, the configuration in which the liquid discharged through the discharge pipe 41 is returned to the inside of the water tank 11 is illustrated, but the configuration is not limited to this configuration, and for example, the configuration may be such that the liquid is discharged to the outside.

Further, in the above embodiment, the membrane module 12 is arranged in the water tank 11, the sludge-containing water is membrane-filtered, and the sludge and the permeated water (treated water) are separated by a membrane (solid-liquid separation). , Not limited to this configuration. For example, it can be applied to an aeration tank in which aeration and aeration stop are repeated to biologically treat water to be treated such as industrial wastewater by the action of activated sludge.

11 ... water tank, 13 ... air diffuser, 30 ... air diffuser, 31 ... air supply pipe, 33 ... air release valve, discharge pipe ... 41, 42 ... on-off valve, 51 ... first pipe, 52 ... second pipe, 53 ... Third pipe

Claims (7)

It is a cleaning method of an air diffuser in which an air diffuser step of supplying air from an air supply pipe to an air diffuser tube immersed in a water tank and air-dissipating air from an air outlet of the air diffuser is performed.
The air supply pipe provided with an air release valve and connected to one end side of the air diffuser pipe,
A step of preparing a discharge pipe provided with an on-off valve and connected to one end side of the air diffuser pipe, and
With the on-off valve closed and the air supply from the air supply pipe stopped, the air release valve is opened to open the inside of the air diffuser pipe to the atmosphere, and the inside of the water tank is opened via the air outlet. The filling process of filling the inside of the air diffuser with liquid,
With the air release valve closed and the on-off valve open, air is supplied from the air supply pipe and sent out to the discharge pipe via one end side of the air diffuser pipe, thereby passing through the air outlet. And the discharge process of discharging the liquid that has flowed into the inside of the air supply pipe through the discharge pipe.
Only including,
A first mode in which the air diffusion step is performed after the filling step, and
A method for cleaning an air diffuser, which includes a second mode in which the discharge step and the air diffuser step are sequentially performed after the filling step. The first mode, the opening time of the atmosphere release valve is not less than 10 seconds per once, once a day or more, a cleaning method of an air diffuser according to claim 1, wherein the performed below 24 times. The method for cleaning an air diffuser according to claim 1 or 2 , wherein the second mode has an opening time of the on-off valve of 10 seconds or more, and is performed once every two weeks or more and once a day or less. The method for cleaning an air diffuser according to any one of claims 1 to 3 , wherein the diameter of the discharge pipe is 1.1 times or more and 2 times or less the diameter of the air supply pipe. The air diffuser connects the first pipe and the second pipe arranged in the vertical direction at intervals and the lower ends of the first pipe and the second pipe, and one end side of the air diffuser is connected halfway. Has a plumb bob with a third pipe
The air supply pipe is formed by the first pipe and one side of the third pipe in the length direction with respect to the connection portion between the air diffuser pipe and the air diffuser pipe.
The air diffuser according to any one of claims 1 to 4 , wherein the second pipe and the other side of the third pipe in the length direction from the connection portion of the air diffuser pipe form the discharge pipe. How to clean the equipment. An air diffuser equipped with an air diffuser that is immersed in a water tank and has an air outlet.
An air supply pipe provided with an air release valve and connected to one end side of the air diffuser pipe to supply air to the air diffuser pipe.
A discharge pipe provided with an on-off valve and connected to one end side of the air diffuser pipe to discharge the liquid flowing into the air diffuser pipe .
A control unit for controlling the supply and stop of air supply from the air supply pipe to the air diffuser pipe, the opening and closing of the atmospheric release valve, and the opening and closing of the on-off valve is provided.
The control unit
An air diffuser mode in which air is supplied from the air supply pipe to the air diffuser pipe with the air release valve and the on-off valve closed, and air is diffused from the air outlet.
In a state where the on-off valve is closed and the supply of air from the air supply pipe is stopped, the air release valve is opened to open the inside of the air diffuser pipe to the atmosphere, and the inside of the water tank is opened via the air outlet. A filling mode that fills the inside of the air diffuser with liquid,
After the filling mode is executed, the air is supplied from the air supply pipe and sent to the discharge pipe via one end side of the air diffuser pipe in a state where the air release valve is closed and the on-off valve is open. , A discharge mode in which the liquid that has flowed into the inside of the air supply pipe through the air outlet is discharged through the discharge pipe.
The control unit further
A first mode in which the air diffuser mode is executed after the charge mode is executed, and
An air diffuser that switches between the discharge mode and the second mode in which the air diffuser mode is executed after the charge mode is executed. The first and second pipes that extend in the vertical direction and are arranged at intervals,
It has a third pipe in which the lower ends of the first pipe and the second pipe are connected to each other and one end side of the air diffuser pipe is connected in the middle.
The air supply pipe is formed by the first pipe and one side of the third pipe in the length direction with respect to the connection portion between the air diffuser pipe and the air diffuser pipe.
The air diffuser according to claim 6 , wherein the second pipe and the other side of the third pipe in the length direction from the connection portion of the air diffuser form the discharge pipe.

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