JPH11309469A - Gas-liquid reaction water treating device, and gas injection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas-liquid reaction water treating device and a gas injection device capable of efficiently performing gas-liquid contact of water to be treated with gas. SOLUTION: The gas-liquid reaction water treating device 30 is provided with an ozone reacting water tank 2 and an opening pipe 32 arranged vertically in the water tank 2 and having opened lower end. The gas injection device 20 for injecting ozone into a water to be treated is arranged in the upper part of the opening pipe 32. The gas injection device 20 has a hollow porous body, and an external pipe body provided outside the hollow porous body. The gaseous ozone fed into the external pipe is passed through the hollow porous body, then being injected into the water to be treated in the hollow porous body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas-liquid reaction water treatment apparatus and gas injector used in a water purification plant, a sewage treatment plant, etc., for dissolving and reacting a gas such as ozone with water.

[0002]

2. Description of the Related Art FIG. 7 shows a conventional gas-liquid reaction water treatment apparatus using ordinary ozone gas having an ozone concentration of about 10 to 20 g / Nm3. As shown in FIG. 7, the gas-liquid reaction water treatment device 1 has an ozone reaction water tank 2, and the ozone reaction water tank 2 is partitioned into a gas-liquid contact part 3 and a retention part 4. At the bottom of the gas-liquid contact part 3, an air diffusion unit 5 composed of a number of ceramic air diffusion tubes is laid, and ozone gas is supplied to the air diffusion unit 5.

The water to be treated introduced into the gas-liquid contact part 3 comes into contact with the rising bubbles of the ozone gas generated from the air diffuser unit 5 and dissolves the ozone gas in the water, as well as reacts with the ozone gas and the oxides in the water to be treated. The oxidation reaction proceeds. Next, the water to be treated is subjected to a finishing treatment in the stagnation section 4 for decolorization, sterilization,
For example, organic substances that are hardly decomposed by microorganisms are easily decomposed. The unreacted ozone from the stagnation section 4 becomes exhausted ozone gas.

Recently, in order to increase the efficiency of dissolving ozone in water, research and development of a gas-liquid reaction water treatment apparatus of a downward injection type using ozone having a concentration higher than the normal ozone concentration shown in FIG. As shown in FIG. 8, the gas-liquid reaction water treatment device 10 of the downward injection type has an ozone reaction water tank 2, and a pipe 1 having a lower end opening is provided in the gas-liquid contact part 3 a of the ozone reaction water tank 2.
1 is laid vertically, and pressurized water to be treated or water to be treated pressurized by the pump 12 is introduced from the upper end of the tube 11. In order to make use of the pressurizing effect, a throttle 13 such as an orifice may be provided at the lower end of the tube 11, and the ozone gas is injected as bubbles into the upper end of the tube 11 from a nozzle-type ozone injector 14. These bubbles flow down together with the flow of the water to be treated in the tube 11, and from the lower end of the tube 11, the gas-liquid contact portion 3a
The gas is released into the air and rises as bubbles, and comes out of the water surface to become exhausted ozone gas. Water that has exited the gas-liquid contact portion 3a is subjected to water treatment via the stagnation portion 4a, as in the case shown in FIG.

[0005] The ozone concentration of the ozone gas injected into the pipe 11 is assumed to be 10 to 20 times that of ordinary (10 to 20 g / m3). Since it becomes as small as / 10 to 1/20, the nozzle type ozone injector 14 and the tube 11 work effectively. In the gas-liquid reaction water treatment device 10, the dissolution / reaction of ozone is performed at a high speed by the action of pressurization and high-concentration ozone, so that a space-saving device can be realized.

[0006]

The gas-liquid reaction water treatment apparatus 1 using ordinary ozone gas shown in FIG. 7 is most often used as a practical apparatus, but has the following problems. (1) The ozone absorption rate is as low as about 80 to 90% and is not high, and the unused ozone loss is discharged as the exhausted ozone gas. (2) Since ozone is dissolved while the rising bubbles reach the water surface, there is a structural restriction that the tank height of the ozone reaction water tank 2 must be as high as 5 to 7 m. (3) From the structural size of the diffuser unit 5 and the characteristic of the amount of diffused air per installation bottom area, the diffuser unit 5 has a large space corresponding to 5 to 10 minutes of water retention time. 3 is laid on the entire bottom surface. Therefore, unevenness of the horizontality and clogging of the air diffusing unit 5 is likely to occur, and the ozone dissolving efficiency is likely to decrease due to unevenness of the bubble flow. (4) For the maintenance of the air diffuser unit 5, it is necessary to drain the entire water of the ozone reaction water tank 2, which causes an operation stop of this system and a large water loss.

On the other hand, the gas-liquid reaction water treatment apparatus 10 of the downward injection type shown in FIG. 8 also has the following problem. (1) In order to maintain high-speed ozone dissolution / reaction, the tank height of the gas-liquid contact part 3a must be as high as 5 to 7 m as in the case of the gas-liquid reaction water treatment apparatus 1 using ordinary ozone gas. There is a structural constraint that it must not. (2) Since the bubble diameter in the nozzle type ozone injector 14 is relatively large, it has a negative effect on the gas-liquid contact efficiency. Further, since the amount of ventilation and the range of change in the amount of ventilation in the ozone injector 14 are small, a large number of ozone injectors 14 must be laid for controlling the ozone injection rate, which complicates the apparatus. Further, there is a problem that even if it can be used for an ozone gas having an ozone concentration of 10 to 20 times the ordinary ozone concentration, it cannot be applied to a high-concentration ozone gas which has a lower ventilation rate and has a larger ventilation rate. (3) In the case where a throttle 13 such as an orifice is provided at the lower end of the tube body 11 to perform melting under pressure, the orifice and the like of the throttle 13 are concentrated at one point. A large pressurizing effect cannot be expected. In addition, maintenance for corrosion, adhesion, clogging, etc. over time is required, and the maintainability is poor.

The present invention has been made in view of the above points, and a gas-liquid reaction water treatment apparatus capable of effectively generating a gas-liquid reaction without increasing the height of the ozone reaction water tank. And a gas injector.

[0009]

SUMMARY OF THE INVENTION The present invention provides a water tank, an open pipe vertically disposed in the water tank, and having an open lower end.
A hollow porous body provided on the upstream side of the open tubular body, the inside of which serves as a water flow path, and an outer tubular body attached outside of the hollow porous body and forming a gas introduction passage between the hollow porous body and A gas-liquid injector having a gas-liquid reaction water treatment device, a hollow porous body having an internal water flow path, and a hollow porous body attached to the outside of the hollow porous body. A gas-liquid reaction water treatment apparatus, comprising: a gas injector having an outer tube body forming a gas introduction passage therebetween; and a meandering pipe connected to the gas injector, and a water flow inside. A gas injector comprising: a hollow porous body serving as a passage; and an outer tube attached outside the hollow porous body and forming a gas introduction passage between the hollow porous body and the hollow porous body. It is.

According to the present invention, gas is introduced into the gas introduction path of the gas injector, and the gas in the gas introduction path is sent to the internal water flow path through the hollow porous body. Water to be treated is supplied to the water channel, and gas is injected into the water channel in the water channel. The gas-injected water to be treated is then sent from the open pipe into the water tank, where gas-liquid contact is performed in the water tank, or sent to a meandering pipe, and gas-liquid contact is performed in the meandering pipe. .

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 and FIG. 2 are views showing a first embodiment of the present invention.

First, a gas-liquid reaction water treatment apparatus will be described with reference to FIG. As shown in FIG.
Is an ozone reaction water tank 2 having an interior partitioned into a gas-liquid contact portion 31 and a retaining portion 4a, and a tube (open tube) 32 which is vertically arranged inside the gas-liquid contact portion 31 and has an open lower end.
And

A gas injector 20 for injecting ozone gas into the water to be treated is connected to an upper portion of the tube 32. Further, at the upper end of the gas injector 20, the pressurized water to be treated or the water to be treated pressurized by the pump 12 is introduced through the water flow pipe 25, so as to make use of the pressurizing effect. A throttle 13 such as an orifice is provided at the lower end of the tube 32. When the pump 12 is used, the gas injector 20 may be moved to the suction side or the discharge side of the pump 12. Ozone gas is supplied from the gas injector 20 to the tube 3.
2 are injected as bubbles inside the upper end.

Next, the gas injector 20 will be described in detail with reference to FIG. As shown in FIG. 1, the gas injector 20 includes a hollow porous body 21 made of ceramics or sintered metal having a water flow path 21 a therein, and a stainless steel outer pipe body 22 surrounding the hollow porous body 21. have. In the outer tube 22, a seal member 24 for gas-liquid sealing of a gap (gas introduction passage) 23 between the outer tube 22 and the hollow porous body 21 is arranged. The outer pipe body 22 is provided with a connection portion 26 such as a flange for connecting to the water flow pipe 25, a gas connection port 28, and a drain port 29. Is provided with a sealing material 27.
Both ends of the hollow porous body 21 are bonded or surface-treated with a member having poor gas-liquid permeability in order to maintain the sealing property. The gas pipe 28a of the injection gas such as ozone is connected to the gas connection port 28, and the gas injector 20 is connected to the water flow path pipe 25 via the connection portion 26. The drain port 29 is provided with an opening / closing valve (not shown).

Next, the operation of the embodiment having the above-described configuration will be described. First, pressurized water to be treated is supplied from the water channel pipe 25 into the gas injector 20.

Next, the water to be treated enters the water flow path 21 a in the hollow porous body 21 of the gas injector 20. On the other hand, an injection gas such as ozone enters the gas introduction passage 23 between the outer tube 22 and the hollow porous body 21 through the gas pipe 28a via the gas connection port 28, and then the porous portion of the hollow porous body 21 Through the water passage 21a inside the hollow porous body 21 as fine bubbles.

The hollow porous body 21 of the gas injector 20 is composed of a porous body having a large number of pores on the order of μm, which is much smaller than the diameter of one nozzle on the order of mm used in the conventional nozzle type ozone injector 14. Thus, many finer ozone gas bubbles are generated in the water flow path 21a, and the gas-liquid contact efficiency can be improved. Further, the hollow porous body 21 can more efficiently increase the ventilation rate than the nozzle type ozone injector 14, can extend the control range of the ozone injection rate, and can obtain a normal ozone concentration (10 to 20 g / m 3). It can be applied to a high concentration ozone gas of about 10 to 20 times.

In FIG. 1, the gas injector 20 is placed horizontally, but it can be installed vertically and horizontally. Usually, in the horizontal gas injector 20, fine bubbles are generated from above the longitudinally downstream portion inside the water flow path 21a of the hollow porous body 21, and in the vertical gas injector 20, the water flow path of the hollow porous body 21 is generated. Occurs along the inner wall above the interior. In this way, even if bubbles are generated not from the entire surface of the hollow porous body 21 but locally, a larger amount of air can be realized without increasing the bubble diameter as compared with the conventional nozzle type ozone injector 14. You.

In the conventional ozone injector 14, even if a plurality of ozone injectors 14 are used, only a few bubbles are generated, so that clogging due to contaminants or oxides in the water to be treated that adheres over time. Are likely to occur rapidly, which makes it difficult to control the injection of gas such as ozone, and has the disadvantage that the water supply must be stopped for the replacement and maintenance. On the other hand, in the hollow porous body 21 according to the present invention, since bubbles are generated in a large number of micropores, clogging is slow and bubbles in the hollow porous body 21 are slightly adjusted by adjusting the gas injection pressure. The generation of air bubbles can be continued from the part where the generation has not occurred, so that the gas injection control can be stabilized and the clogging maintenance period can be extended.

Next, the water to be treated, into which ozone has been injected in the gas injector 20, then flows down in the tube 32 and is discharged from the lower end of the tube 32 into the gas-liquid contact portion 31. In this case, the ozone bubble becomes an ascending bubble in the gas-liquid contact portion 31, and comes out of the water surface to become exhausted ozone gas. Gas-liquid contact part 31
The treated water that has exited is subjected to water treatment via the retaining section 4a.

In this embodiment, by using the gas injector 20, the gas-liquid contact efficiency is improved, the control range of the gas injection rate is expanded, and the normal ozone concentration (10 to 20 g / m
Application to ozone gas of high concentration up to about 10 to 20 times of 3) is possible. Further, it is possible to stabilize the gas injection control and extend the clogging maintenance period.

Second Embodiment Next, a second embodiment of the present invention will be described with reference to FIG. In the second embodiment shown in FIG. 3, a vertically arranged hermetic tube 41 is connected to the upstream side of the gas injector 20 installed in the ozone reaction water tank 2. An additional gas injector 20a having a structure similar to that of the gas injector 20 is provided at the upper part. In FIG. 3, the same portions as those of the embodiment shown in FIGS. 1 and 2 are denoted by the same reference numerals, and detailed description is omitted.

In FIG. 3, first, the pressurized water to be treated flows into the additional gas injector 20a, and this additional gas injector 20a
Inside, ozone is injected into the pressurized water to be treated.
The treated water into which ozone has been injected is then removed from the closed pipe 4
Gas-liquid contact takes place in 1. Next, the water to be treated flows into the gas injector 20, and ozone is again injected into the water to be treated in the gas injector 20. The water to be treated is
Thereafter, the gas is sent from the pipe 32 to the retaining portion 4a via the gas-liquid contact portion 31.

According to the embodiment shown in FIG. 3, the following operational effects are obtained. That is, when applying a high-concentration ozone gas up to about 10 to 20 times that of ordinary use, even if the gas-liquid reaction water treatment apparatus 30 shown in FIG. A decrease in efficiency may occur. In this case, it is conceivable to connect a plurality of gas-liquid reaction water treatment devices 10 shown in FIG. 2 in parallel,
This involves an increase in equipment costs and difficulty in adjustment. According to the present embodiment, the additional gas injector 20a having a large ventilation amount and the sealed tube 41 which does not need to be submerged and has excellent installation properties are arranged on the upstream side of the ozone reaction water tank 2, so that Part of the excessive ventilation can be efficiently shared. In addition, the control range of the ozone injection rate can be expanded, and a common 10
The application of ozone gas having a high concentration up to about 20 times can be expanded. Further, according to the present embodiment, a longer contact reaction time between the water to be treated and the ozone gas can be ensured in the sealed tube 41. For this reason, the stagnation part 4a of the ozone reaction water tank 2, which is difficult to install, can be omitted or simplified.

Third Embodiment Next, a third embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 4, the gas-liquid reaction water treatment apparatus 30 is configured by combining a gas injector 20 and a meandering pipe 51 connected to the gas injector 20 via a disconnecting joint 54. It consists of system 50.

One or more gas-liquid reaction piping systems 50 each composed of the gas injector 20 and the meandering piping 51 are provided, and the gas-liquid reaction piping systems 50 of each set are connected by a flow path switch 53. In addition, a bypass pipe 52 is connected between the flow path switches 53.

Further, the gas-liquid reaction water treatment apparatus 30 includes a water tank 6
1 and an open tubular body 62 whose lower end is open
(FIG. 5A).

This pipe 62 is connected to the downstream side of the gas-liquid reaction piping system 50 shown in FIG. 4 and has a throttle 13 at the lower end.

The gas injector 20 shown in FIG.
Has the same structure as the gas injector shown in FIG.

Next, the operation of the present embodiment having the above configuration will be described. As shown in FIG. 4, pressurized water to be treated enters the gas injector 20 of the gas-liquid reaction piping system 50 via the flow path switch 53, and ozone is injected into the water to be treated in the gas injector 20. Is done.

Next, the water to be treated flows through the meandering pipe 51, during which gas-liquid contact is sufficiently performed. Thereafter, the water to be treated flows out into the water tank 61 via the pipe 62 shown in FIG. 5A, and gas-liquid contact is also made in the water tank 61.

According to the present embodiment, the gas injector 20 and the meandering pipe 51 can be freely deformed in the three-dimensional direction according to the installation conditions, so that not only the necessary gas-liquid contact volume but also the stagnation portion volume is reduced. A volume extending to a closed meandering pipe 51 without loss of exhausted ozone can be secured. Since the air bubbles in the meandering pipe 51 pass through the upper surface in the flow path in the horizontal drawing pipe, the effective gas-liquid contact volume is secured in the vertical drawing meandering pipe 51 portion. In addition, a concave or a projection that becomes a bubble pool is avoided, and a minimum flow velocity allowed for the water to be treated containing bubbles is secured.

A bypass pipe 52 and a flow path switch 53
And the removal joint 54, the gas-liquid reaction piping system 50 composed of the gas injector 20 and the meandering piping 51 is connected to the flow switching device 5.
By switching to 3, the bypass pipe 52 can be switched, and an arbitrary gas-liquid reaction pipe system 50 can be selected from the plurality of gas-liquid reaction pipe systems 50. Accordingly, the gas-liquid contact can be optimally performed in response to a change in the ozone injection rate due to a future seasonal change in water quality, and the maintenance of the gas injector 20 can be performed without interruption of the water flow path.

Further, as shown in FIG. 5 (a), a pipe 62 laid vertically from the water surface of the water tank 61 to near the bottom and having a lower end opened is provided following the gas-liquid reaction piping system 50. Since the throttle 13 is provided at the lower end of the tank 62, the water depth in the water tank 61 can be freely designed according to the installation conditions of the gas-liquid reaction piping system 50 and the pipe 62.

It is desirable to maintain the water depth of the water tank 61 at 4 to 6 m or more in order to stably increase the internal pressure of the entire flow path. In this case, since the main purpose of the form of the tube 62 is to maintain the water depth, unlike the conventional tube 11 shown in FIG. 8, it is not necessary to make the downward bubble moving speed as slow as possible. The diameter of the tube 62 can be reduced, and the installation including the water tank 61 is simplified.

In the case of an installation condition where a desired water depth cannot be secured, in the present invention, a pressure corresponding to the insufficient water depth is secured by the flow resistance of the entire water flow path from the gas-liquid reaction piping system 50 to the outlet of the pipe 62. Can be. In this case, from the viewpoint of the pressurizing effect, it is desired to reduce the diameter of the water passage terminal, that is, the pipe diameter of the pipe body 62. This is also an installation advantage. In the present invention, it is possible to have a retaining portion function in the water flow path from the gas-liquid reaction piping system 50 to the pipe 62, but it is also possible to use the water tank 61 as the retaining portion.

Next, a modified example of this embodiment will be described. Instead of the tube 62 shown in FIG. 5A, a rising tube 71 is connected to the downstream side of the gas-liquid reaction piping system 50, and the upper portion of the rising tube 71 is opened to the atmosphere. The water tank 73 is connected via the water receiving pipe 72 or directly (FIG. 5B). The rising height of the rising pipe 71 can be freely designed according to the installation conditions of the gas-liquid reaction piping system 50 and the rising pipe 71.

In the present modification, maintaining the height position of the riser pipe 71 at 4 to 6 m or more from the gas injector 20 is because the internal pressure of the entire flow path is stably increased, and the pressurizing effect and its stability Sexually desirable. In this case, since the configuration of the riser tube 71 focuses on maintaining the height, the riser terminal tube 71 is smaller than the conventional downward injection tube 11 shown in FIG.
The diameter of the pipe can be reduced, and the installation is simplified. In the case of installation conditions where a desired height cannot be secured, in the present invention, a pressure corresponding to the insufficient height is raised from the gas-liquid reaction piping system 50 to the rising pipe 7.
It can be ensured by the flow path resistance of the entire water flow path up to the first outlet. In this case, from the viewpoint of the pressurizing effect, it is desired to reduce the diameter of the water flow path terminal, that is, the diameter of the rising pipe 71. This is also an installation advantage.

Further, according to this modification, when it is difficult to secure the depth of the terminal pipe and to install the civil engineering tank, and there is a margin in the height,
It has the advantage that it can be easily installed while maintaining performance.

Next, a further modification will be described. FIG.
Instead of the tube 62 shown in FIG.
A water channel throttle mechanism 81 may be connected to the downstream side of FIG. 5 (FIG. 5C). The water channel throttle mechanism 81 includes an introduction pipe 85a,
Reducers 85, 8 that do not allow bubbles to accumulate in the inlet pipe 85a
The flow path switch 84 is provided between the reducer 85 and the reducers 86 and 87.

According to the present embodiment, the pressurizing effect of the gas-liquid contact reaction is ensured by the flow resistance of the entire water flow path up to the throttle mechanism 81 of the water path of the gas-liquid reaction piping system 50. It is desired to increase the internal pressure of the mold type gas injector 20 to 4 to 6 m or more, so that most of the flow path resistance can be obtained intensively by the water channel restricting mechanism 81 serving as a terminal of the gas-liquid reaction water treatment device 30. Is desired. Since this flow path resistance is affected by fluctuations in the flow rate of the treated water, a plurality of thin tubes 82, 83 corresponding to the fluctuation steps can be provided, and the thin tubes 82, 83 can be switched and selected by the flow path switch 84.

The squeezing mechanism by the thin tubes 82 and 83
The 2,83 diameter and length are freely designed, so that the stability is higher than that of the conventional throttle, and it is possible to increase the internal pressure to 4 to 6 m or more, which dramatically improves the efficiency of gas-liquid contact reaction. It becomes possible. Although the flow path switching device 84 may be switched manually, the fluctuation value of the treated water flow rate is measured, and the flow switching device 8
It is desirable that automatic control be performed in conjunction with the switching of No. 4 and the adjustment of the amount of ozone gas injected into the pipeline gas injector 20.

Fourth Embodiment Next, a fourth embodiment of the present invention will be described with reference to FIG. In the embodiment shown in FIG. 6, in the gas-liquid reaction water treatment apparatus shown in the first to third embodiments, the closed retention cylinders 91 and 93 shown in FIG. The closed retaining cylinders 91 and 93 are connected to each other by a connecting pipe 92.

Each of the closed retaining cylinders 91 and 93 has a structure in which water is introduced from below and water is discharged from above, and has a relatively large diameter. The diameter, height, and number of the closed retention cylinders 91 and 93 are designed so that a predetermined water retention time is obtained according to the installation conditions, and the upper structure communicating with the water outflow portion has a diameter so that bubble accumulation does not occur. Narrow connection pipe 9
It is adjusted to the caliber of 2. The diameter of the connecting pipe 92 is such that the lowest linear velocity of the water flow at which the bubbles in the water flow are conveyed in the downflow direction can be maintained.

The water to be treated introduced into the lower part of the retaining cylinder 91 has a gentle flow due to a decrease in the linear velocity of the water stream due to the increase in the diameter of the retaining cylinder 91, and a predetermined residence time is secured before reaching the upper part of the retaining cylinder 91. Is done. As the diameter from the upper portion of the retaining cylinder 91 to the water outflow portion decreases, the water stream linear velocity increases, and the connecting pipe 9
The air bubbles flow into the retaining cylinder 93 while being transported through the air cylinder 2.

According to the present embodiment, a longer residence time can be easily ensured by the closed retention cylinders 91 and 93 having no waste ozone loss without increasing the length of the water passage pipe, and a longer residence time is required. Application to a gas-liquid reaction system becomes possible.

[0047]

As described above, according to the present invention, gas-liquid contact between the water to be treated and the gas can be performed efficiently. Therefore, the water to be treated can be effectively treated in a state where the apparatus is compact, without increasing the size of the entire apparatus.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a gas injector showing a first embodiment of the present invention.

FIG. 2 is a schematic diagram of a gas-liquid reaction water treatment device.

FIG. 3 is a schematic diagram of a gas-liquid reaction water treatment apparatus showing a second embodiment of the present invention.

FIG. 4 is a schematic diagram of a gas-liquid reaction water treatment apparatus showing a third embodiment of the present invention.

FIG. 5 is a diagram showing an apparatus disposed downstream of a gas-liquid reaction piping system.

FIG. 6 is a schematic view of a gas-liquid reaction water treatment apparatus showing a fourth embodiment of the present invention.

FIG. 7 is a diagram showing a conventional gas-liquid reaction water treatment apparatus.

FIG. 8 is a diagram showing another conventional gas-liquid reaction water treatment apparatus.

[Explanation of symbols]

 2 Ozone reaction water tank 4a Retaining portion 20 Gas injector 21 Hollow porous body 22 Outer tube 30 Gas-liquid reaction water treatment device 31 Gas-liquid contact portion 32, 62 Open tube 41 Closed tube 50 Gas-liquid reaction piping system 51 Meandering pipe 52 Bypass pipe 53,84 Flow path switch 54 Removal joint 61,73 Water tank 81 Throttle mechanism 82,83 Small pipe 85,86,87 Reducer

Claims (8)

[Claims] 1. A water tank, an open pipe vertically arranged in the water tank and having an open lower end, a hollow porous body provided upstream of the open pipe and having a water flow passage therein, and a hollow porous body. A gas injector having an outer tube mounted outside the porous body and forming a gas introduction passage between the porous body and the hollow porous body. 2. A closed-type tube connected to the upstream side of the gas injector and arranged vertically, a hollow porous body provided on the upper portion of the closed-type tube and having a water flow passage therein, and a hollow porous body. The gas-liquid according to claim 1, further comprising: an additional gas injector having an outer tube attached to the outside of the porous body and forming a gas introduction passage with the hollow porous body. Reaction water treatment equipment. 3. A gas injector having a hollow porous body having a water flow passage therein, and an outer tube mounted outside the hollow porous body and forming a gas introduction passage between the hollow porous body. And a meandering pipe connected to the gas injector. 4. The water tank according to claim 3, further comprising: a water tank; and an opening pipe vertically disposed in the water tank, having a lower end opened and connected to a downstream side of the meandering pipe. Gas-liquid reaction water treatment equipment. 5. The gas-liquid reaction water treatment apparatus according to claim 4, wherein an upper end of the open pipe is open to the atmosphere. 6. The gas-liquid reaction water treatment apparatus according to claim 3, wherein a water channel throttle mechanism is provided downstream of the meandering pipe. 7. The gas-liquid reaction water treatment apparatus according to claim 1, further comprising a closed retention cylinder that guides the gas-introduced water from a lower portion and allows the water to flow out from an upper portion. 8. A hollow porous body having a water flow passage therein, and an outer tube mounted outside the hollow porous body and forming a gas introduction passage between the hollow porous body and the hollow porous body. A gas injector characterized in that: