JP2002126480A - Ozone water treatment equipment - Google Patents

Abstract

(57) [Problem] To provide a low-cost ozone water treatment apparatus which does not require a waste ozonolysis treatment step and has a low backwashing frequency of a filtration device. An ozone water treatment apparatus according to the present invention includes a treatment water (3).
, An ozone dissolving means 6 for mixing ozone gas generated from an ozone generator 7 with filtered water to be treated, an ozone reaction tank 8 for reacting the mixed ozone gas with the water to be treated, and ozone. A gas-liquid separator 11 provided in the reaction tank 8 for separating surplus ozone gas and water to be treated;
Is provided, and the ventilation part 15 of the second ozone dissolving means 14 communicates with the exhaust part 16 of the gas-liquid separator 11, and the filtering apparatus 2 is provided with a second gas-liquid separator 17.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ozone water treatment apparatus which is useful when applied to ozone water treatment as a method for treating various types of water, such as water and sewage, pool water, industrial water, and industrial wastewater.

[0002]

2. Description of the Related Art Ozone gas generated by an ozone generator has an action of oxidizing and removing dissolved harmful substances dissolved in water by its own strong oxidizing power. It is used to treat various types of water such as water. In any case, an operation such as dissolving ozone gas in water is necessary, and the ozone gas generated by the ozone generator is dissolved in water with as high efficiency as possible to further enhance the treatment effect, and at the same time, a reduction in treatment cost is required. Have been. Therefore, increasing the contact efficiency between water and ozone gas by creating countless fine ozone gas bubbles, efficiently dissolving and absorbing ozone gas in water, and reducing the volume of excess ozone exhausted without being dissolved in water as much as possible. Is a mandatory requirement. FIG. 6 shows a conventional ozone water treatment apparatus. In the figure, 2 is a filtration device, 6 is an ozone dissolving means, 7 is an ozone generator, 8 is an ozone reaction tank, 9 is a diffuser, 11 is a gas-liquid separator, 12 is a defoamer, and 13 is decomposed ozone. It is a tank. Filtration device 2
Is provided before the ozone treatment, and is provided with a filter medium 1 such as sand.
Is filled. In order to avoid wasteful consumption of ozone due to suspended matter at the time of ozone treatment, pretreatment such as removing fine suspended matter in the water to be treated 3 is performed. At this time, in order to stabilize the filtration performance, an operation of injecting and mixing the flocculant 4 into the water to be treated 3 at a stage prior to the filtration device 2 and forming a floc in the filter medium 1 is performed. In addition, the filter device 2 is clogged with the suspended matter trapped in the filter medium 1 as the operation time elapses, so that it is necessary to periodically perform an operation such as backwashing and washing the filter medium. The filtered water 5 from which fine suspended matters have been removed in this manner is mixed with ozone gas supplied at an ozone gas flow rate or ozone gas concentration arbitrarily set in advance by an ozone generator 7 inside an ozone dissolving means 6 such as an ejector. The mixture is gas-liquid mixed and sent to the ozone reaction tank 8. Alternatively, the treated water 5 sent to the ozone reaction tank 8 is brought into contact with the finely-divided ozone gas ejected from the air diffuser 9 provided at the bottom of the ozone reaction tank 8 and gas-liquid mixed. In the ozone reaction tank 8, the ozone dissolved in the water reacts with the dissolved harmful substance to be removed for a certain period of time, whereby the harmful substance is decomposed and removed by oxidation, and is sent as ozone-treated water 10 to the subsequent stage. Ozone that is not consumed or decomposed in the ozone reaction tank 8 and does not dissolve in the filtered water is present as surplus ozone gas in the gas that has been gas-liquid separated in the gas-liquid separator 11 or the upper part of the ozone reaction tank 8. . This gas contains a foaming organic substance and the like, and is removed by the defoaming device 12 so as not to lower the performance of the subsequent ozonolysis treatment. The surplus ozone gas is decomposed into oxygen by the activated carbon or the catalyst filled in the exhaust ozone decomposition tank 13 at the subsequent stage, rendered harmless, and then released into the atmosphere. The ozone dissolving performance of secondary effluent in a general sewage treatment plant is greatly affected by the type of gas used as a raw material for ozone and ozone treatment conditions such as the mixing ratio of water to be treated and ozone gas. About 70 to 95%, and about 30 to 5% of the amount of ozone generated by the ozone generator is exhausted as surplus ozone.

[0003]

However, in the conventional ozone water treatment apparatus, about 5 to 30% of the amount of ozone generated by the ozone generator becomes excess ozone,
Ozone treatment is required to decompose it into oxygen, render it harmless, and exhaust it.Therefore, defoaming equipment that removes the foaming organic substances required in the first stage of the exhaust ozonolysis treatment and consumption of clean water and power related to it Alternatively, large-scale consumption of waste ozone decomposition equipment, activated carbon, and ozone decomposition catalyst for decomposing excess ozone has been essential. That is, the wasteful waste of the generated ozone and the waste ozonolysis treatment are important factors for raising the cost of the ozone treatment. Furthermore, in the conventional filtration device, a large amount of coagulant was consumed, and the coagulation cost involved was not negligible. In addition, when floc is formed on the surface layer of the filter medium by the flocculant, the frequency of clogging is accelerated, so the number of backwashing / washing increases, and the labor and the amount of backwash water or power consumption increase. Problem had arisen. Therefore, an object of the present invention is to eliminate surplus ozone by effectively utilizing all of the ozone generated by the ozone generator, thereby eliminating the need for a step of decomposing ozone. Another object of the present invention is to provide an ozone water treatment apparatus that can reduce the frequency of backwashing of the filtration device by reducing the amount of coagulant injected into the filtration device, thereby reducing the labor and cost involved in backwashing. .

[0004]

In order to solve the above-mentioned problems, an ozone water treatment apparatus according to claim 1 is provided with a filtration device for filtering the water to be treated and an ozone generator for generating the filtered water to be treated. Ozone dissolving means for mixing and dissolving ozone gas, an ozone reaction tank for reacting the mixed ozone gas and the water to be treated, and a gas-liquid separator provided in the ozone reaction tank for separating excess ozone gas and the water to be treated. In the ozone water treatment apparatus provided with the above, a ventilation part of a second ozone dissolving means and an exhaust part of the gas-liquid separator are communicated with a pre-stage or inside of the filtration apparatus, and a second gas-liquid It is configured to have a separator. According to the ozone water treatment apparatus of the first aspect, almost all of the ozone generated by the ozone generation apparatus can be used, so that no excess ozone is exhausted, and accordingly, the defoaming apparatus and the waste ozone gas decomposition tank are used. It becomes unnecessary. In addition, the effect of reducing the cost of aggregation and the frequency of backwashing can be brought about by the aggregation effect of ozone. Furthermore, the filtration device is not merely intended to remove suspended matter, and the trapped suspended matter is decomposed and removed by ozone, and at the same time, the effect of further promoting the effect of ozone treatment in the subsequent stage is brought about. Can be. The ozone water treatment apparatus according to claim 2, wherein the ozone gas supply line from the ozone generator to the ozone dissolving means is branched and connected to the second ozone dissolving means, and the second ozone dissolving means and the ozone Flow rate adjusting means is provided on both the ozone gas introduction sides of the dissolving means. According to the ozone water treatment apparatus of the second aspect, it is possible to further improve the ozone aggregation effect and the decomposition / removal effect of the reaction between the ozone and the suspended matter in the filtration device according to the first aspect. The ozone water treatment apparatus according to claim 3, wherein a dissolved ozone concentration meter is provided inside or at a later stage of at least one of the filtration device and the ozone reaction tank, and a measured value of the dissolved ozone concentration meter and a preset value are set. A controller that compares and generates a control signal corresponding to the difference transmits the control signal to the flow rate adjusting unit to control the flow rate of the ozone gas. According to the ozone water treatment apparatus of the third aspect, even if the quality of the water to be treated fluctuates, the ozone coagulation effect and the ozone and suspended matter in the filtration apparatus according to the first and second aspects are automatically operated. And a decomposition / removal effect due to the reaction with the compound can be stably obtained. According to a fourth aspect of the present invention, in the ozone water treatment apparatus, the destination of the control signal is the ozone generator instead of the flow rate adjusting means. According to the ozone water treatment apparatus of the fourth aspect, similarly to the effect of the third aspect, the ozone water coagulation effect in the filtration apparatus and the decomposition / removal effect by the reaction between the ozone and the suspended matter in the filtration apparatus are accommodated. And the ozone treatment effect in the ozone reaction tank can be stably obtained. The ozone water treatment apparatus according to claim 5, further comprising an ozone gas concentration meter for measuring the concentration of ozone gas in the exhaust gas at a stage subsequent to the second gas-liquid separation means, wherein a measurement value from the ozone gas concentration meter and a preset value are set. And a controller that generates a control signal according to the difference.
The control signal is transmitted to at least one of the flow rate adjusting means and the ozone generator to control the ozone injection amount. According to the ozone water treatment apparatus of the fifth aspect, even when the quality of the water to be treated fluctuates, the apparatus can be operated safely without generating excessive ozone.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described in detail with reference to the drawings. (First Embodiment) FIG. 1 shows a first embodiment of the present invention.
Shown in FIG. 1 is a schematic diagram showing an outline of an ozone water treatment apparatus. In the figure, 2 is a filtration device, 6 is an ozone dissolving means, 7 is an ozone generating device, 8 is an ozone reaction tank, 9 is a diffuser, 11 is a gas-liquid separator, 14 is a second ozone dissolving means, and 15 is A ventilation part of the second ozone dissolving means 14, an exhaust part 16 of the gas-liquid separator 11, and a second gas-liquid separator 17 are shown. The filtration device 2 is filled with a particulate filter medium 1 such as sand, and a second ozone dissolving means 14 such as an ejector is provided at a preceding stage of the filtration device 2. The ventilation part 15 of the second ozone dissolving means 14 communicates with the exhaust part 16 of the gas-liquid separator 11 disposed above the ozone reaction tank 8. In this way, a means for re-dissolving the gas containing excess ozone separated from water in the upper part of the ozone reaction tank 8 in the preceding stage of the filtration device 2 is constituted. In addition, the filtering device 2 is provided with a second gas-liquid separator 17 at an upper portion to remove gas mixed with the water to be treated inside. The ozone generator 7 supplies ozone gas to an ozone dissolving means 6 such as an ejector at the preceding stage of the ozone reaction tank 8 via an ozone gas supply line 18. The filtration device 2 is not limited to a type such as a downward type or an upward type, and may be not only a fixed-type filter medium but also a filtration apparatus filled with a floating filter medium. Further, the second ozone dissolving means 1 in the preceding stage of the filtration device 2
The ozone dissolving means 6 such as the ejector 4 and the ejector in front of the ozone reaction tank 8 may be of a type that is installed inside the tank to diffuse fine ozone gas. Further, depending on the case, a storage means such as a drain tank may be provided after the gas-liquid separation means is evacuated. The operation of this embodiment will be described. When the water to be treated 3 passes through the second ozone dissolving means 14 and the ventilation part 15, the excess ozone from the exhaust part 16 of the gas-liquid separator 11 is dissolved and sent to the filtration device 2. In the filtration device 2, the filtered water 5 from which suspended matter has been removed is obtained. When passing through the ozone dissolving means 6 such as an ejector, the filtered water 5 is mixed with the ozone gas supplied from the ozone generator 7 and sent into the ozone reaction tank 8. When dissolving ozone in water, the volume ratio of treated water 5 to ozone gas [L /
G] It is preferable to adjust the ratio to be 10 or more. Ozone dissolved in water in the ozone reaction tank 8 reacts with a dissolved harmful substance to be removed for a certain period of time to decompose and remove harmful substances by strong oxidizing power. Water is sent to the latter stage. Ozone that is not consumed or decomposed in the ozone reaction tank 8 and does not dissolve in the filtered water is present as surplus ozone in the gas separated from the water in the upper part of the ozone reaction tank 8. This gas is returned to the ventilation part 15 of the second ozone dissolving means 14 at the previous stage of the filtration device 2 by the exhaust part 16 of 11 and is dissolved again in the water to be treated. The surplus ozone simultaneously redissolved here is consumed by reacting with suspended matter and dissolved organic matter in the water to be treated 3 or organic matter captured by the filtration device 2 or dissolved in water. As a result, almost no ozone is present in the gas separated from the water in the second gas-liquid separator 17, and the gas is discharged out of the system as a gas containing organic substances and moisture without any particular need for the waste ozone decomposition treatment. You. That is, the ozone supplied from the ozone generator 7 is consumed almost completely by acting on the water to be treated. The ozone re-dissolved in the water to be treated 3 acts on the particles and colloids of the water to be treated 3 to cause a coagulation action and, at the same time, reacts with organic matter trapped in the filtration tank to decompose. It plays the role of promoting the action of ozone during ozone treatment. According to this embodiment, the excess ozone is redissolved in the raw water to be treated together with the gas that has been gas-liquid separated in the upper part of the gas-liquid separator or the ozone reaction tank, and the suspended matter or dissolved organic matter in the treated water or the filtration tank The ozone supplied from the ozone generator is almost completely consumed because it is consumed by reacting with the organic matter trapped in the water or dissolved in water. Therefore, since ozone hardly exists in the gas discharged from the gas-liquid separator provided in the filtration device, the defoaming device and the discharged ozone gas decomposition tank are not required. In addition, since ozone has an aggregating action, mixing ozone into the filtration device brings about an effect of reducing the aggregating agent, thereby reducing the agglomeration cost and reducing the frequency of backwashing. In addition, the trapped suspended matter is decomposed and removed by ozone, and at the same time, the filter device is not merely intended to remove suspended matter, but also provides a reaction effect by ozone in order to further promote the effect of ozone treatment in the subsequent stage. Becomes

(Second Embodiment) FIG. 2 shows a second embodiment of the present invention. FIG. 2 is a schematic diagram showing an outline of the ozone water treatment apparatus. In the figure, 19 is a flow rate adjusting means. The ozone gas supply line 18 supplied from the ozone generator 7 is branched, and one of the ozone gas supply lines 18 is provided in an ozone dissolving unit 6 such as an ejector provided in front of the ozone reaction tank 8, and the other is provided in a second stage provided in front of the filtration device 2. Ozone dissolving means 1
4 to the ventilation part 15. The branched ozone gas supply line 18 is provided with flow rate adjusting means 19 for adjusting the flow rate of ozone gas supplied in each direction. The operation of this embodiment is as follows. Water quality fluctuates, such as an increase in the pollutant load of the water to be treated 3.
If the pretreatment effect of the ozone treatment such as coagulation cannot be obtained as expected, the ozone gas supplied from the ozone generator 7 is appropriately dissolved by adjusting the flow rate of the ozone gas by the flow rate adjusting means 19 so as not to be excessive. And an operation for increasing the effect of ozone in the filtration device 2. According to this embodiment, the injection amount of ozone dissolved in the former stage of the filtration device can be controlled in accordance with the quality of the water to be treated, so that the coagulation effect of ozone and the reaction between ozone and suspended matter in the filtration device 2 can be achieved. The decomposition / removal effect can be further improved.

(Third Embodiment) FIG. 3 shows a third embodiment of the present invention. FIG. 3 is a schematic view showing an outline of the ozone water treatment apparatus. In the figure, 20 is a dissolved ozone concentration meter and 21 is a controller. The dissolved ozone concentration meter 2 is connected to the water supply line of the filtered water 5 sent from the filtration device 2 or the ozonized water 10 sent from the ozone reaction tank 8.
0 is arranged. Also, the ozone gas supplied from the ozone generator 7 to the ozone dissolving means 6 such as an ejector installed before or inside the ozone reaction tank 8 and the second ozone dissolving means 14 provided before or inside the filtering device 2 An automatic flow rate adjusting means 19 for adjusting the flow rate is provided. Further, a controller 21 is installed to input a measured value of the dissolved ozone concentration and output the same to the flow rate adjusting means 19 for driving. In the operation of this embodiment, the dissolved ozone concentration of the filtered water 5 or the ozonated water 10 is measured by the dissolved ozone concentration meter 20, and the measured value is input to the controller 21. The controller 21 compares the input dissolved ozone concentration measurement value with a preset dissolved ozone concentration set value, and if the values are different from each other, the feedback opening control of the flow rate control means 19 is performed by PID feedback control in accordance with the difference. Is operated to adjust the ozone injection amount by changing the ventilation amount, and to perform an operation such that the dissolved ozone concentration approaches the target set value. According to this embodiment, the dissolved ozone concentration is kept constant even if the quality of the water to be treated fluctuates. Therefore, the agglomeration effect of ozone and the ozone and suspended matter in the filtration device described in claim 1 and claim 2 Decomposition / removal effect due to the reaction with is always stable.

(Fourth Embodiment) FIG. 4 shows a fourth embodiment of the present invention. FIG. 4 is a schematic view showing an outline of the ozone water treatment apparatus. A dissolved ozone concentration meter 20 is provided in a water supply line of the filtered water 5 sent from the filtration device 2 or the ozonated water 10 sent from the ozone reaction tank 8. In addition, the controller 21 is installed to input a measured value of the dissolved ozone concentration and output it to the drive unit of the ozone generator 7. The operation of this embodiment is performed by using the filtered water 5
Alternatively, the dissolved ozone concentration of the ozonized water 10 is measured by the dissolved ozone concentration meter 20 and the measured value is
1 is input. The controller 21 compares the input measured value of the dissolved ozone concentration with a preset set value of the dissolved ozone concentration. If the values are different, the driving power of the ozone generator 7 is controlled by feedback control by PID accordingly. Alternatively, an operation is performed such that the amount of generated ozone, that is, the amount of injected ozone is adjusted by changing the frequency, and the dissolved ozone concentration approaches the target set value. According to this embodiment, even if the dissolved ozone concentration is reduced due to an increase in the consumption of ozone due to an increase in the pollutant load of the water to be treated, the dissolved ozone concentration set in advance is increased by increasing the ozone injection amount. Can be kept. In addition, when the pollution load decreases and the ozone consuming substance decreases and the dissolved ozone concentration increases, the dissolved ozone concentration can be kept constant by reducing the amount of injected ozone to eliminate wasteful consumption of ozone. it can. That is, it is possible to stably obtain the ozone coagulation effect in the filtration device, the decomposition / removal effect by the reaction between ozone and suspended matter, and the ozone treatment effect in the ozone reaction tank in response to the water quality fluctuation of the water to be treated.

(Fifth Embodiment) FIG. 5 shows a fifth embodiment of the present invention. FIG. 5 is a schematic diagram showing an outline of the ozone water treatment apparatus. In the figure, reference numeral 22 denotes an ozone gas concentration meter. Second gas-liquid separator 17 attached to filtration device 2
The ozone gas concentration meter 22 is disposed in the exhaust line of the above. In addition, an ozone dissolving unit 6 such as an ejector installed before or inside the ozone reactor 8 from the ozone generator 7.
And an automatic flow rate adjusting means 19 for adjusting the flow rate of the ozone gas sent to the second ozone dissolving means 14 provided before or inside the filtering device 2. Further, the controller 21 is installed to input a measured value of the ozone gas concentration and output the measured value to the flow rate adjusting means 19 and the driving unit of the ozone generator 7. In the operation of this embodiment, the ozone gas concentration in the exhaust gas passing through the exhaust line is measured by the ozone gas concentration meter 22, and the upper limit of the ozone injection amount is set by the controller 21 so that the ozone gas concentration does not exceed a preset ozone gas concentration set value. And ozone gas to be supplied to the ozone dissolving means 6 such as an ejector provided before or inside the ozone reaction tank 8 and the second ozone dissolving means 14 provided before or inside the filtration device 2 based on the calculated value. The amount of ozone generation, that is, the amount of injected ozone is limited when the air flow opening degree of the flow rate adjusting means 19 is controlled or when the driving power or the frequency of the ozone generator 7 is controlled, and always exceeds the preset ozone gas concentration set value. Driving without. According to this embodiment, even when the quality of the water to be treated fluctuates, the apparatus can be safely operated without supplying excess ozone and without leaking ozone to the outside.

[0010]

As described above, according to the ozone water treatment apparatus of the first aspect, surplus ozone is contained in the raw water to be treated together with the gas separated in the gas-liquid separator or the upper part of the ozone reaction tank. The ozone supplied from the ozone generator is almost completely consumed because it is dissolved again and is consumed by reacting with suspended matter and dissolved organic matter in the treated water or organic matter trapped in the filtration tank or dissolved in water. Would.
Therefore, since ozone hardly exists in the gas discharged from the gas-liquid separator provided in the filtration device, the defoaming device and the discharged ozone gas decomposition tank are not required. In addition, since ozone has an aggregating action, mixing ozone into the filtration device brings about an effect of reducing the aggregating agent, thereby reducing the agglomeration cost and reducing the frequency of backwashing. In addition, the trapped suspended matter is decomposed and removed by ozone, and at the same time, the filter device is not merely intended to remove suspended matter, but also provides a reaction effect by ozone in order to further promote the effect of ozone treatment in the subsequent stage. Becomes According to the ozone water treatment apparatus of the second aspect, the injection amount of ozone dissolved in the former stage of the filtration device can be controlled in accordance with the quality of the water to be treated. The effect of decomposition / removal due to the reaction with is further improved. According to the ozone water treatment apparatus according to the third aspect, the dissolved ozone concentration is kept constant even if the quality of the water to be treated fluctuates. In this case, the effect of decomposition and removal by the reaction between ozone and suspended matter can be constantly performed stably. According to the ozone water treatment apparatus of the fourth aspect, even if the concentration of dissolved ozone decreases due to an increase in the pollutant load of the water to be treated and a decrease in the ozone consuming substance and an increase in the consumption of ozone, The dissolved ozone concentration can be maintained at a preset concentration by increasing the injection amount. In addition, when the pollution load decreases and the ozone consuming substance decreases and the dissolved ozone concentration increases, the dissolved ozone concentration can be kept constant by reducing the amount of injected ozone, and wasteful consumption of ozone can be eliminated. Thus, stable processing can always be performed. According to the ozone water treatment apparatus of claim 5, even when the quality of the water to be treated fluctuates,
The apparatus can be operated safely without supplying excess ozone and without leaking ozone to the outside.

[Brief description of the drawings]

FIG. 1 is a schematic view of an ozone water treatment apparatus showing a first embodiment of the present invention.

FIG. 2 is a schematic view of an ozone water treatment apparatus according to a second embodiment of the present invention.

FIG. 3 is a schematic view of an ozone water treatment apparatus showing a third embodiment of the present invention.

FIG. 4 is a schematic view of an ozone water treatment apparatus according to a fourth embodiment of the present invention.

FIG. 5 is a schematic view of an ozone water treatment apparatus showing a fifth embodiment of the present invention.

FIG. 6 is a schematic view showing a conventional ozone water treatment apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Filter medium 2 Filtration apparatus 3 To-be-processed water 4 Coagulant 5 Filtration processing water 6 Ozone dissolving means 7 Ozone generator 8 Ozone reaction tank 9 Air diffuser 10 Ozonized water 11 Gas-liquid separator 12 Defoaming apparatus 13 Discharge ozone decomposition tank 14 Second ozone dissolving means 15 Vent section 16 Exhaust section 17 Second gas-liquid separator 18 Ozone gas supply line 19 Flow rate adjusting means 20 Dissolved ozone concentration meter 21 Controller 22 Ozone gas concentration meter

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G01N 33/18 102 G01N 33/18 102 // C02F 1/00 C02F 1/00 LF term (Reference) 4D050 AA01 AA10 AA15 AB12 BB02 BD02 BD03 BD06 BD08 4G035 AA02 AE02 AE13 AE19 4G037 BA03 BB03 BB06 BC03 BD06 EA01 4G042 CE01

Claims (5)

[Claims] 1. An apparatus for filtering treated water, an ozone dissolving means for dissolving ozone gas generated from an ozone generator in the filtered treated water, and an ozone reaction for reacting the mixed ozone gas with the treated water. In an ozone water treatment apparatus provided with a tank and a gas-liquid separator provided in the ozone reaction tank and separating excess ozone gas and water to be treated, a second ozone dissolving means is provided before or inside the filtration device. An ozone water treatment apparatus, wherein a ventilation part of the second ozone dissolving means is communicated with an exhaust part of the gas-liquid separator, and a second gas-liquid separator is provided in the filtration device. . 2. An ozone gas supply line from the ozone generator to the ozone dissolving means is branched and connected to the second ozone dissolving means, and the ozone gas of both the second ozone dissolving means and the ozone dissolving means is connected. The ozone water treatment apparatus according to claim 1, wherein a flow rate adjusting means is provided on an introduction side. 3. A dissolved ozone concentration meter is provided inside or at a later stage of at least one of the filtration device and the ozone reaction tank, and a measured value of the dissolved ozone concentration meter is compared with a preset set value, and according to a difference therebetween. The ozone water treatment apparatus according to claim 2, wherein the controller that generates the control signal transmits the control signal to the flow rate adjusting unit to control the flow rate of the ozone gas. 4. The ozone water treatment apparatus according to claim 3, wherein the transmission destination of the control signal is the ozone generator instead of the flow rate adjusting means. 5. An ozone gas concentration meter for measuring an ozone gas concentration in exhaust gas is provided at a stage subsequent to the second gas-liquid separation means, and a measured value from the ozone gas concentration meter is compared with a preset set value, and a difference between the measured values is compared. 3. The ozone water treatment according to claim 2, wherein a controller that generates a control signal according to the above is transmitted to at least one of the flow rate adjusting unit and the ozone generator to control the amount of injected ozone. apparatus.