JP2750052B2 - Ozone diffuser - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ozone diffusing apparatus for diffusing ozone into treated water, bringing the ozone into contact with the treated water, and reacting the treated water for treating water using ozone.

[0002]

2. Description of the Related Art In water treatment using ozone, methods for bringing ozone into contact with treated water include a method using an ejector and a method using a diffuser. In particular, when treating a large amount of water, such as water from sewage or sewage, a method using a diffuser is generally used.

[0003] The ozone diffuser is a device for diffusing ozone into fine bubbles in treated water, and is designed so that the fine bubbles of ozone are uniformly diffused throughout the treated water.

FIG. 10 is a schematic perspective view showing a conventional example of this type of ozone diffuser.

[0005] As shown in the figure, the ozone diffuser includes an ozone contact pond 1 for storing treated water, a large number of diffuser cylinders 2 disposed at the bottom of the ozone contact pond 1, and an ozone diffuser. And two riser tubes 4 and ozone distribution headers 3, which are pipes for sending the ozone.

The diffuser cylinder 2 is provided with a large number of fine pores on its outer peripheral portion. The diffuser cylinder 2 is uniformly positioned at a constant water depth at the bottom of the ozone contact pond 1 in the same direction parallel to the bottom. Are located. These air diffusion cylinders 2 are connected to the two ozone distribution headers 3 by half each.

Further, one end of the riser pipe 4 is divided into two branches and connected to the two ozone distribution headers 3. The other end of the riser pipe 4 is connected to an ozone generator 5 installed outside the ozone contact pond 1.

In the above configuration, the ozone generated by the ozone generator 5 is sent to each of the diffuser cylinders 2 through the riser pipe 4 and the ozone distribution header 3, and from the minute pores of each of the diffuser cylinders 2, the ozone contact pond 1 is discharged. It diffuses into treated water as fine bubbles.

Incidentally, the air diffuser 2 has an appropriate air flow rate range per one. Therefore, the total number of the diffuser cylinders 2 is set in accordance with the appropriate ventilation amount range per one diffuser cylinder 2 and the maximum ozone injection amount corresponding to the maximum treated water amount of the ozone contact pond 1.

That is, in the above-mentioned ozone diffuser, when the amount of treated water stored in the ozone contact pond 1 is the maximum treated water amount and the ozone injection amount is the maximum ozone injected amount corresponding to the maximum treated water amount. The ozone diffused from the air diffusers 2 uniformly arranged at the bottom of the ozone contact pond 1 diffuses uniformly throughout the treated water while coming into contact with the treated water while floating in the treated water. Thereby, a sufficient ozone treatment effect can be obtained.

[0011]

However, when the amount of treated water in the ozone contact pond 1 is reduced, the amount of injected ozone is reduced accordingly. When the amount of injected ozone is reduced, the amount of ventilation per one diffuser cylinder 2 is also reduced. If the amount of injected ozone is reduced so that the ventilation rate per one of the diffuser cylinders 2 does not reach the appropriate ventilation range, ozone cannot be evenly diffused from each diffuser cylinder 2, Therefore, ozone cannot be uniformly diffused throughout the treated water.

That is, in the above-mentioned conventional ozone diffuser, if the amount of treated water in the ozone contact pond 1 decreases and the amount of injected ozone decreases accordingly, a sufficient ozone treatment effect cannot be obtained. There was a problem.

The present invention has been made to solve this problem. Ozone is uniformly and stably diffused throughout the treated water in response to a change in the amount of ozone injected with a change in the treated water amount. It is an object of the present invention to provide an ozone diffuser capable of performing the above-described operations.

[0014]

In order to achieve the above object, in an ozone diffusing apparatus according to the present invention, a large number of diffusing cylinders are divided into a plurality of groups, and the diffusing cylinders constituting each group are divided into a plurality of groups. Each group was evenly arranged at the bottom of the ozone contact pond. Further, a means for separately and selectively sending ozone to each group of the diffuser cylinders is provided.

Further, a means for supplying a minute amount of ozone or air even when ozone is stopped is provided.

[0016]

In the ozone diffusing apparatus having the above structure, when the amount of injected ozone is reduced, a group to which ozone is sent is selected and air is diffused only from the diffusing cylinders of the group. Is maintained in an appropriate ventilation range. Therefore, the ozone diffuses evenly from each of the diffuser cylinders in the selected group. Moreover, since the diffuser cylinders constituting each group are uniformly arranged at the bottom of the ozone contact pond for each group, the ozone diffused from the diffuser cylinders of the selected group is uniformly diffused throughout the treated water.

Furthermore, even when a small amount of ozone or air is ventilated to the diffusion cylinders of the group in which the diffusion of ozone is stopped, intrusion of the treated water into the diffusion cylinders can be prevented.

[0018]

Embodiments of the present invention will be described below with reference to the drawings. Note that among the components of the embodiment, those that are not different from the components of the conventional example shown in FIG. 10 are denoted by the same reference numerals, and description thereof will be omitted.

Embodiment 1 FIG. FIG. 1 is a schematic plan view showing a configuration of an ozone diffuser according to a first embodiment of the present invention, and FIG. 2 is a schematic side view thereof.

As shown in the figure, in this ozone diffusing apparatus, a large number of diffusing cylinders 2 arranged at a constant depth at the bottom of the ozone contact pond 1 are divided into a plurality of groups, for example, two groups A and B each having a half number. Divided. Moreover, the diffuser cylinders 2a and 2b constituting the respective groups A and B are uniformly arranged, for example, two at a time at the bottom of the ozone contact pond 1 for each group.

The total number of the diffuser cylinders 2 is set according to an appropriate ventilation range per one diffuser cylinder 2 and a maximum ozone injection amount corresponding to a maximum treated water amount of the ozone contact pond 1.

Also, the ozone distribution header 3 and the riser pipe 4, which are pipes for sending ozone to the respective diffuser cylinders 2, correspond to the groups A and B of the diffuser cylinder 2, respectively. 2 each, riser tube 4
Are provided for each group.

Two ozone distribution headers 3a of group A
Are arranged parallel to each other on the left and right sides of the ozone contact pond 1 in a state of being perpendicular to the direction of the diffuser cylinder 2, and the two ozone distributing headers 3b of the group B are likewise described above. It is arranged side by side with the ozone distribution header 3a of group A.

Then, the diffuser cylinder 2 of each of the groups A and B is used.
Half of a and 2b located on the left and right sides of the ozone contact pond 1 are connected to the ozone distribution headers 3a and 3b disposed on the left and right sides of the ozone contact pond 1 as described above.

Further, one end of each of the riser pipes 4a and 4b corresponding to each of the groups A and B is divided into two branches and connected to the ozone distribution headers 3a and 3b, respectively. It is connected to the ozone generator 5 installed outside the ozone contact pond 1 via the valves 6a and 6b.

Therefore, by opening and closing the two valves 6a, 6b, the air diffusion cylinders 2a, 2a,
Ozone from the ozone generator 5 can be sent to 2b separately and selectively for each group.

In the ozone diffuser having the above structure, the amount of treated water is the maximum treated water amount of the ozone contact pond 1 or an amount close thereto, and the amount of ozone injected from the ozone generator 5 is almost the maximum amount of ozone injected. Are the two valves 6a,
6b is opened. Then, the ozone from the ozone generator 5 is sent to the diffuser cylinders 2a and 2b of both groups A and B, that is, all the diffuser cylinders 2, and from the micropores of each diffuser cylinder 2 into the treated water of the ozone contact pond 1. It diffuses as fine bubbles. In this way, the ozone diffused from all the diffuser cylinders 2 uniformly arranged at the bottom of the ozone contact pond 1 diffuses uniformly throughout the treated water while coming into contact with the treated water while floating in the treated water.

When the amount of treated water is reduced to about half of the maximum treated water amount and the amount of injected ozone is substantially reduced by half, one of the two valves 6a and 6b is opened and the other is closed. I do. For example, if only the valve 6a corresponding to the group A is opened, the ozone generator 5
Is sent only to the diffuser cylinder 2a of the group A, and is diffused only from the diffuser cylinder 2a of the group A.

As described above, when the amount of injected ozone is almost halved, one group A corresponding to half of all the diffuser cylinders 2 is used.
By diffusing ozone only from the diffuser cylinder 2a,
The ventilation amount of ozone per one diffusion tube 2a is almost the same as that at the time of the maximum ozone injection amount, and is kept in an appropriate ventilation amount range. Therefore, the ozone is distributed to each of the diffusion tubes 2a of the group A.
From evenly. Moreover, since the diffuser cylinders 2a and 2b constituting each of the groups A and B are uniformly arranged at the bottom of the ozone contact pond 1 for each group, the ozone diffused from the diffuser cylinder 2a of the group A is treated water. Spreads evenly throughout.

As described above, according to the ozone diffuser having the above configuration, even when the amount of injected ozone is reduced by half with the decrease in the amount of treated water, ozone can be uniformly diffused throughout the treated water.

In the first embodiment, the diffuser cylinders 2 are divided into two groups A and B by half, but the diffuser cylinders 2 are divided into more groups, and the diffuser cylinders constituting each group are divided into groups. If the ozone contact pond 1 is uniformly arranged on the bottom of each pond and the ozone is separately and selectively sent to each group of the diffuser cylinders 2, the change in the amount of ozone injected according to the change in the amount of treated water On the other hand, while maintaining the ozone ventilation rate per diffusion cylinder in an appropriate ventilation range, the number of diffusion cylinders to be diffused is adjusted more finely,
Ozone can always be uniformly diffused throughout the treated water. In addition, if the number of air diffusion cylinders in each group is appropriately set for each group and the groups are divided, it is possible to precisely cope with a change in the ozone injection amount with a small number of groups.

Embodiment 2 FIG. FIG. 3 is a schematic side view of an ozone diffuser according to Embodiment 2 of the present invention.

As shown in the figure, the difference between this ozone diffuser and the first embodiment is that the valves of the riser pipes 4a and 4b which are provided for each of the groups A and B of the diffuser cylinder 2 have an opening degree, that is, an open / closed state. And the use of opening-adjustment electric valves 7a and 7b (hereinafter simply referred to as electric valves 7a and 7b) that can be freely adjusted from a fully closed state to a fully opened state by an electric signal. It is in. That is, in this ozone diffuser, riser tubes 4a and 4b having electric valves 7a and 7b are provided as means for separately and selectively sending ozone to each of the groups A and B of the diffuser cylinder 2. .

In the ozone diffuser having the above structure, when the amount of treated water is at or near the maximum treated amount of the ozone contact pond 1, and the amount of ozone injected from the ozone generator 5 is almost the maximum amount of ozone injected. Means both electric valves 7
a, 7b are fully opened, and the diffusing cylinders 2 of both groups A, B
The ozone treatment is performed using a and 2b.

When the amount of treated water is reduced to about half of the maximum treated water amount and the amount of injected ozone is reduced by almost half, the one corresponding to one of the two electric valves 7a and 7b, for example, the group A is handled. Only the electric valve 7a is fully opened, and only the diffuser cylinder 2a of the group A is used. At the same time, the other electric valve 7b corresponding to the group B whose use is to be stopped is slightly opened from the fully closed state.

Then, most of the ozone from the ozone generator 5 is sent to the diffuser cylinder 2a of the group A to be used and diffused, and diffuses throughout the treated water. At the same time, a small amount of ozone is also sent to the diffuser cylinder 2b of the group B whose use has been discontinued, and diffuses. Thereby, infiltration of the treated water into the diffuser cylinder 2b of the group B whose use has been stopped is suppressed. In other words, the riser pipe 4 corresponding to the extent that the infiltration of the treated water into the diffuser cylinder 2b of the group B whose use has been stopped is suppressed.
The opening degree of the electric valve 7b is adjusted so that ozone is also sent to the air diffusion cylinder 2b.

At this time, the amount of ozone sent to the diffuser cylinder 2b of the group B whose use is stopped is very small compared to the amount of ozone sent to the diffuser cylinder 2a of the group A used. The ozone ventilation amount of the cylinder 2a can be kept in an appropriate ventilation range. Therefore, even when the amount of injected ozone is reduced by half with the decrease in the amount of treated water, ozone can be uniformly diffused throughout the treated water, as in the first embodiment.

By the way, the group B whose use has been completely discontinued
When the treated water enters the diffusion tube 2b of the
When the use of the group B is resumed, the air diffusion from the air diffuser cylinder 2b of the group B cannot be started until the infiltration water is pushed out by the ozone. In some cases, when treated water enters the diffuser cylinder 2b, fine solids contained in the treated water clog the micropores of the diffuser cylinder 2b. It may not be possible to evenly diffuse air.

According to the ozone diffuser of the second embodiment, as described above, it is possible to suppress the infiltration of the treated water into the diffuser cylinder 2b of the group B whose use has been stopped. When the use is resumed, the air can be immediately diffused from the diffuser cylinders 2b of the group B, and the ozone can be evenly diffused from the respective diffuser cylinders 2b.

Embodiment 3 FIG. FIG. 4 is a schematic side view of an ozone diffuser according to Embodiment 3 of the present invention.

As shown in the figure, the difference between the ozone diffuser and the second embodiment shown in FIG. 3 is that the riser tubes 4a and 4b of the groups A and B are respectively provided with riser tubes 4a and 4b.
Is provided with valve control devices 8a and 8b for measuring the flow rate of ozone and controlling the degree of opening of the corresponding electric valves 7a and 7b based on the measured values.

In the ozone diffuser of this configuration, the valve control devices 8a and 8b of the riser pipes 4a and 4b constantly measure the flow rate of ozone, and the ozone injection amount is reduced by almost half as the amount of treated water decreases. In that case, the valve control device 8
a and 8b detect the half of the ozone injection amount from the change in the flow rate. Then, a valve control device of a predetermined group, for example, the valve control device 8b of group B sends an electric signal to the corresponding electric valve 7b to reduce its opening, thereby suppressing the ingress of the preset treated water. Automatically set to opening.

As a result, most of the ozone from the ozone generator 5 is sent to the diffuser cylinder 2a of one group A and diffuses into the treated water. At this time, the valve control device 8a of the group A controls the opening degree of the corresponding electric valve 7a to keep the ozone ventilation amount of the diffuser cylinder 2a in an appropriate ventilation amount range. At the same time, a predetermined amount of ozone is also sent to the other group B, that is, the air diffuser cylinder 2b of the group B whose use is to be discontinued, through the electric valve 7b set to the above-described treated water intrusion suppression opening, and diffused. Infiltration of the treated water into the diffuser cylinder 2b is suppressed. Therefore, the same effect as that of the second embodiment can be obtained. Moreover, in the case of the third embodiment, the infiltration of the treated water into the diffuser cylinder 2b of the group B whose use has been stopped is automatically and more reliably suppressed.

Embodiment 4 FIG. FIG. 5 is a schematic side view of an ozone diffuser according to a fourth embodiment of the present invention.

As shown in the figure, the difference between this ozone diffuser and the second embodiment shown in FIG.
b are provided with bypass pipes 9a and 9b connecting the upstream side and the downstream side of the electric valves 7a and 7b, and the bypass pipes 9a and 9b are provided with bypass opening adjustment electric valves 10a and 10b. It is in.

According to this configuration, the amount of injected ozone is reduced by almost half as the amount of treated water is reduced, and the two electric valves 7a,
7b, for example, riser tube 4b corresponding to group B
When the use of the group B is stopped by completely closing the electric valve 7b of the above, the ozone is sufficiently reduced to the extent that the infiltration of the treated water is suppressed through the bypass pipe 9b into the diffuser cylinder 2b of the group B whose use is stopped. Can be sent. That is, in this ozone diffuser, each bypass pipe 9a, 9b
When the use of any of the groups A and B is stopped, the opening of the electric valves 10a and 10b is adjusted in advance so as to suppress the infiltration of the treated water into the diffuser cylinders of the group whose use has been stopped. And set it.

As described above, in the case of this ozone diffuser, the same effect as that of the second embodiment can be obtained.

Embodiment 5 FIG. FIG. 6 is a schematic side view of an ozone diffuser according to Embodiment 5 of the present invention.

As shown in the figure, in this ozone diffuser, each of the bypass pipes 9a and 9 in the fourth embodiment shown in FIG.
b, the flow rate of ozone in the respective bypass pipes 9a, 9b is measured, and the bypass valve control devices 11a, 11b, which adjust the opening of the corresponding bypass opening adjustment electric valves 10a, 10b based on the measured values. 11b is provided.

The bypass valve control device 11a, 1
By providing 1b, the opening of the bypass degree-of-opening adjustment electric valves 10a, 10b can be automatically adjusted so as to more reliably suppress the infiltration of the treatment water into the respective diffuser cylinders 2a, 2b.

Embodiment 6 FIG. FIG. 7 is a schematic side view of an ozone diffuser according to Embodiment 6 of the present invention.

As shown in the figure, the difference between the ozone diffuser and the second embodiment shown in FIG. 3 is that a blower 12 is provided and air from the blower 12 is supplied to each riser pipe 4a. , 4b are provided with blower pipes 13a, 13b for flowing downstream of the valves 6a, 6b, and the blower pipes 13a, 13b are further provided with blower opening adjusting electric valves 14
a and 14b are provided.

In the ozone diffuser of this configuration, the amount of injected ozone is almost halved as the amount of treated water is reduced, and one of the two electric valves 7a and 7b, for example, the electric valve 7b of the riser pipe 4b corresponding to the group B When the use of the group B is stopped by setting the fully closed state, the blower 12 is operated, and at the same time, only the opening degree adjustment electric valve 14b of the blower tube 13b corresponding to the group B is fully closed. To a predetermined opening. Then, the air from the air blower 12 is sent to the diffuser cylinder 2b of the group B through the blower pipe 13b and the riser pipe 4b and diffused, whereby the infiltration of the treatment water into the diffuser cylinder 2b is suppressed. In other words, the opening degree of the corresponding opening adjustment electric valve 14b of the blower pipe 13b is set so as to suppress the infiltration of the treated water into the air diffusion cylinder 2b of the group B whose use has been stopped, and the air is supplied to the air diffusion cylinder 2b. To send.

When the use of the group B is stopped, the blower 12 is automatically operated by using an electric signal for closing the electric valve 7b of the riser pipe 4b corresponding to the group B, and It is also possible to control the opening adjustment electric valve 14b to open to a predetermined opening.

As described above, in the case of the ozone diffusing device, the same effect as that of the second embodiment can be obtained. Moreover, instead of using the ozone from the ozone generator 5, the air from the blower 12 provided separately from the ozone generator 5 is used as a means for suppressing the infiltration of the treated water into the diffuser cylinders 2 a and 2 b. As a result, the amount of injected ozone can be maintained as set.

Embodiment 7 FIG. FIG. 8 is a schematic side view of an ozone diffuser according to a seventh embodiment of the present invention.

As shown in the figure, in this ozone diffuser, the blower tubes 13a, 13b in the sixth embodiment shown in FIG.
In addition, the blower valve control devices 15a and 15b which measure the air flow rates of the respective blower tubes 13a and 13b and adjust the opening of the corresponding blower opening adjustment electric valves 14a and 14b based on the measured values. Is provided.

The blower valve control devices 15a and 15b
Is provided, so that the blow opening adjustment electric valve 14
The opening degrees of the a and 14b can be automatically adjusted so as to more reliably suppress the inflow of the treatment water into each of the diffuser cylinders 2a and 2b.

Embodiment 8 FIG. FIG. 9 is a schematic side view of an ozone diffuser according to Embodiment 8 of the present invention.

As shown in FIG.
The blower pipes 13a and 13b of the sixth embodiment shown in FIG. 6 are provided with blower opening control valves 14a and 14b and minimum flow control valves 16a and 16b. The opening degree of the minimum flow rate adjustment valves 16a and 16b is adjusted in advance so that air is diffused to such an extent that treated water does not enter the diffusion cylinders 2a and 2b when the electric valves 7a and 7b are fully opened. ing.

Further, in order to reduce the ozone injection amount, the blower 12 is operated by a signal that one of the electric valves 7a and 7b is closed, and the electric valves 14a and 14b are controlled to open.

Therefore, when it becomes necessary to reduce the ozone injection amount by half, it is possible to simultaneously prevent the treatment water from entering the diffuser cylinder 2a or 2b.

In the ozone diffuser in each of the above embodiments, the diffuser cylinder 2 is not limited to the two groups A and B.
Needless to say, even when the number of groups is increased, the number of groups can be increased.

[0064]

As described above, according to the ozone diffuser according to the present invention described in each of the first to eighth embodiments, even if the amount of injected ozone decreases with the decrease of the amount of treated water, the ozone diffuser is always Can be uniformly diffused throughout the treated water, so that a sufficient ozone treatment effect can always be obtained.

Further, in the ozone diffuser described in the second to eighth embodiments, since the infiltration of the treated water into the diffuser cylinder of the group whose use has been stopped can be suppressed, the use of the group whose use has been stopped can be suppressed. When resuming, it is possible to immediately start the air diffusion from the air diffusion cylinders of the group, and to evenly diffuse the ozone from each air diffusion cylinder. As a result, ozone treatment according to the amount of treated water can always be reliably performed.

[Brief description of the drawings]

FIG. 1 is a schematic plan view of an ozone diffuser according to a first embodiment of the present invention.

FIG. 2 is a schematic side view of the ozone diffuser according to the first embodiment of the present invention.

FIG. 3 is a schematic side view of an ozone diffuser according to a second embodiment of the present invention.

FIG. 4 is a schematic side view of an ozone diffuser according to a third embodiment of the present invention.

FIG. 5 is a schematic side view of an ozone diffuser according to a fourth embodiment of the present invention.

FIG. 6 is a schematic side view of an ozone diffuser according to a fifth embodiment of the present invention.

FIG. 7 is a schematic side view of an ozone diffuser according to a sixth embodiment of the present invention.

FIG. 8 is a schematic side view of an ozone diffuser according to a seventh embodiment of the present invention.

FIG. 9 is a schematic side view of an ozone diffuser according to an eighth embodiment of the present invention.

FIG. 10 is a schematic perspective view of an ozone diffuser in a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ozone contact pond 2, 2a, 2b Diffusion cylinder 3, 3a, 3b Ozone distribution header 4, 4a, 4b Riser pipe 5 Ozone generator 6a, 6b Valve 7a, 7b Opening adjustment electric valve 8a, 8b Valve control device 9a, 9b bypass pipes 10a, 10b electric valve for bypass opening adjustment 11a, 11b valve control device for bypass 12 air blower 13a, 13b air pipe 14a, 14b electric valve for air opening adjustment 15a, 15b air blow valve control device

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-4-135699 (JP, A) JP-A-4-27496 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) C02F 1/78 C02F 3/20 B01F 3/04

Claims (7)

(57) [Claims] 1. An ozone contact pond for storing treated water, a number of diffuser cylinders arranged at the bottom of the ozone contact pond, and a pipe for sending ozone from an ozone generator to each diffuser cylinder. In an ozone diffusing device for diffusing ozone from an air diffusion cylinder into treated water in an ozone contact pond, the large number of air diffusion cylinders are divided into a plurality of groups, and the air diffusion cylinders constituting each group are divided into groups. An ozone diffusing device, comprising: means for uniformly distributing ozone to each group of the diffusing cylinders, which are uniformly arranged on the bottom of the ozone contact pond. 2. An ozone contact pond for storing treated water, a number of diffuser cylinders arranged at the bottom of the ozone contact pond, and a pipe for sending ozone from an ozone generator to each diffuser cylinder. In an ozone diffusing device for diffusing ozone from an air diffusion cylinder into treated water in an ozone contact pond, the large number of air diffusion cylinders are divided into a plurality of groups, and the air diffusion cylinders constituting each group are divided into groups. A riser pipe provided with an opening-adjustment electric valve for each of the groups of the diffuser cylinders as means for uniformly and selectively sending ozone to the respective groups of the diffuser cylinders, which are uniformly arranged on the bottom of the ozone contact tank. An ozone diffuser characterized by comprising: 3. A valve control device for measuring the flow rate of ozone in the riser pipe and controlling the opening of the opening adjustment electric valve based on the measured value. The ozone diffuser according to claim 2. 4. A bypass pipe connecting an upstream side and a downstream side of the opening degree adjustment electric valve of the riser pipe, and a bypass opening degree adjustment electric valve is provided in the bypass pipe. Item 3. The ozone diffuser according to Item 2. 5. A bypass valve control device for measuring the flow rate of ozone in the bypass pipe and controlling the opening of the bypass opening adjustment electric valve based on the measured value. The ozone diffuser according to claim 4, characterized in that: 6. An air blower is provided, and a blower pipe for flowing air from the blower into a downstream side of the electric valve for adjusting the opening of the riser pipe is provided. The ozone diffuser according to claim 2, further comprising an electric valve. 7. A blower valve controller that measures the flow rate of ozone in the blower tube and controls the opening of the blower opening adjustment electric valve based on the measured value. The ozone diffuser according to claim 6, wherein: