JP2001225088A - Ozone contact method, ozone contact apparatus and water treatment apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ozone contact method, an ozone contact apparatus and a water treatment apparatus holding a high ozone dissolving speed in a flow channel, enhancing the concentration of OH radicals to enable the dividing injection of ozone, reducing the number of parts and constituted compactly, economically and practically. SOLUTION: Negative pressure parts are formed in a flow channel, through which a fluid to be treated or a mixed fluid of the fluid to be treated and hydrogen peroxide flows, at a plurality places along the flow direction of the fluid to be treated or mixed fluid and an ozone-containing fluid is injected in the respective negative pressure parts. Throttled parts 12a, 12b gradually contracted in the cross-sectional area of the flow channel along the flow direction of the fluid to be treated or mixed fluid, expanded parts 16a, 16b gradually expanded in the cross-sectional area of the flow channel along the flow direction of the fluid to be treated or mixed fluid and the ozone contact parts 10a, 10b provided in the vicinity of the outlets 13a, 13b of the throttled parts and having ozone injection ports 15a, 15b in which the ozone-containing fluid is injected are arranged to the flow channel 1 along the flow direction of the fluid to be treated or mixed fluid and the cross-sectional area of the flow channel of the outlets of the throttled parts is successively increased along the flow direction of the fluid to be treated or mixed fluid.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ozone contact method and apparatus for injecting and diffusing a fluid containing ozone into a fluid to be treated or a mixed fluid obtained by mixing hydrogen peroxide with the fluid to be treated, and further relates to this method. The present invention relates to a water treatment apparatus for subjecting treated water to ozone treatment or combined use of hydrogen peroxide and ozone using such an ozone contact device.

[0002]

2. Description of the Related Art Ozonation of water is a method of oxidizing and decomposing harmful substances in water to be treated by utilizing the oxidizing power of ozone.
The hydrogen peroxide-ozone combined treatment is a method of decomposing harmful substances in the water to be treated by OH radicals having a higher oxidizing power than ozone generated by the reaction between hydrogen peroxide and ozone, in addition to ozone. The water to be treated includes, for example, wastewater from factories, water and sewage, groundwater, leachate from final disposal sites, and the like.

FIG. 14 shows a conventional water treatment apparatus of this type.
There is an oxidizing apparatus for water treatment described in Japanese Patent Application Laid-Open No. H8-10780. This device includes a closed tank 101, a pump 103, a pipe 104, a cover 105, a venturi tube 106, an intake hole 107, a space 108, a discharge pipe 10
9, a gas supply hole 111 is provided. Next, the operation of this device will be described. Inlet 1 of venturi tube 106
07 on the water surface 102 in the closed tank 101
08 and operating the pump 103, the space 1
08, that is, ozone gas, etc.
6 and is injected into the water 110 to be treated, part of it is consumed, most of it floats on the surface of the water and accumulates in the space 108, and is again sucked into the venturi tube 106 to remove unconsumed ozone gas. Reused. At this time, the oxidation reaction proceeds by the ozone dissolved in the water, and the water to be treated is treated.

[0004]

The conventional water treatment apparatus is configured as described above, and it is clear that substances extremely harmful to the human body, such as trichlorethylene, dioxins and PCBs, are present in the environment. Despite the increasing social need to inject large amounts of ozone, the efficiency of dissolving ozone is low and this has not been possible. In addition, it became clear that some of the substances very harmful to the human body could not be decomposed by ozone alone,
The need for a water treatment apparatus using OH radicals, which have stronger oxidizing power than ozone, has been increasing in society. OH radicals can be generated by reacting hydrogen peroxide with ozone. Therefore, such an apparatus was applied to an ozone treatment method using hydrogen peroxide in combination. However, the decomposition rate by OH radical is very fast, and the oxidizing power is strong enough to decompose substances that cannot be decomposed by ozone alone.
H radicals have high reactivity, so they also react with substances other than the substances to be decomposed in the water to be treated, such as ozone and other radicals, and ozone and OH radicals are consumed ineffectively, resulting in reduced decomposition efficiency. was there.

Therefore, the present inventors have devised a concept of dividing and injecting ozone in order to improve the decomposition efficiency. This is the result of a detailed analysis of the radical reaction,
In injecting the same amount of ozone, the amount of OH radicals reacting with ozone and other radicals can be suppressed by dividing and injecting ozone, as compared with the case of injecting ozone at one point, and This is because they have found that OH radicals can promote an amount of reacting with a decomposition target substance in the water to be treated. FIG. 15 shows such a water treatment apparatus described in Japanese Patent Application Laid-Open No. 10-272479 by the present inventors. This apparatus includes an ozone reactor 1, an ozone generator 2, a treated water supply pump 3, a hydrogen peroxide addition pump 4, ozonized gas inlets 5a to 5d, an exhausted ozone decomposer 6, a hydrogen peroxide storage tank 7, Gas-liquid separation tank 8, ozonized gas flow meters 9a to 9d, treated water pipe 30, hydrogen peroxide injection pipe 31, treated water pipe 32, ozonized gas pipe 3
3. An exhaust ozone gas pipe 34 is provided.

Next, the operation of this device will be described.
The water to be treated containing the polluted organic substance is supplied to the treated water supply pump 3
Is supplied to the ozone reactor 1 having a flow path of the water to be treated via the pump pipe 30. Hydrogen peroxide is introduced into the ozone reactor, that is, the ozone contact device 1 from the hydrogen peroxide storage tank 7 via the hydrogen peroxide pipe 31 by the hydrogen peroxide addition pump 4, and is added to the water to be treated. Further, the ozonized gas is branched from the ozone generator 2 via the pipe 33, adjusted to a predetermined flow rate by the flow meters 9a to 9d, and supplied to the ozonized gas inlets 5a to 5d. At the ozonized gas injection ports 5a to 5d, ozone is dissolved in the water to be treated. In the ozone reactor 1, the dissolved ozone reacts with the added hydrogen peroxide to generate OH radicals, and the OH radicals and ozone decompose and remove polluting organic substances contained in the water to be treated, thereby treating the water in an advanced manner. I do. The ozone that has not been completely dissolved in the water to be treated in the ozone reactor 1 is separated into gas and liquid in the gas-liquid separation tank 8, and the exhausted ozone decomposing device 6 is filled with an ozonolysis catalyst via a pipe 34 as exhausted ozone. To be harmlessly decomposed into oxygen and released to the atmosphere.

[0007] Further, in the above-mentioned Japanese Patent Application Laid-Open No. Hei 10-272479, as shown in FIG.
L, TOC (Total) of the water to be treated at the time of one-point injection and two-point injection when the injected ozone concentration is 120 mg / L.
It shows the change in Organic Carbon (total organic carbon) concentration, and explains that increasing the number of injection points to two reduces the TOC concentration and improves the quality of treated water.

As described above, according to Japanese Patent Application Laid-Open No. 10-272479, hydrogen peroxide is added and mixed in a flow path through which water to be treated flows, and ozone is introduced at a plurality of locations.
That is, by dividing the number of times of supply of ozone into a plurality of times, it is possible to suppress an increase in the concentration of ozone dissolved in water and suppress the ineffective consumption of OH radicals and ozone.
The substance to be treated can be efficiently decomposed by radicals.

However, there has been no water treatment apparatus capable of maintaining a high ozone dissolution rate and increasing the concentration of OH radicals in the flow channel to split and inject ozone gas. If only a split injection is used, for example, an air diffusion tower as shown in FIG. 17 can be used for simple construction, but a high ozone dissolution rate cannot be obtained, and O
It is impossible to increase the H radical concentration and efficiently decompose the substance to be treated using OH radicals. Further, ozone gas cannot be sucked by merely arranging two or more venturi tubes (ejectors) of the same type in series, and for example, an apparatus as shown in FIG. 18 can be considered.

FIG. 17 shows an ozone generator 301,
Ozone gas supply pipe 302, first and second ozone gas flow meters 303a and 303b, first and second ozone gas diffusers 304a and 304b, first and second treated water pipes 305a,
305b, first and second ozone reaction towers 306a, 306
b, treated water supply pump 307, treated water supply pipe 30
8, treated water flow meter 309, hydrogen peroxide storage tank 310,
Hydrogen peroxide supply pump 311, hydrogen peroxide supply pipe 31
2. It has first and second exhaust ozone gas channels 313a and 313b.

Next, the operation will be described. The water to be treated containing the polluted organic substance is first supplied to the treated water supply pump 307 by the treated water flow meter 309 and the treated water supply pipe 3.
08 to the first ozone reaction tower 306a.
On the way, the hydrogen peroxide is supplied from the hydrogen peroxide storage tank 310 to the hydrogen peroxide supply pipe 31 by the hydrogen peroxide supply pump 311.
2 to the water to be treated. Further, an ozonized gas is supplied from an ozone generator 301 to an ozone gas supply pipe 302.
The gas is supplied from the first air diffuser 304a to the first ozone reaction tower 306a via the first ozone gas flow meter 303a. In the first ozone reaction tower 306a, the ozone is dissolved,
The dissolved ozone reacts with the added hydrogen peroxide to form O 2
H radicals are generated, and the OH radicals and ozone decompose and remove the organic pollutants contained in the water to be treated, and the water is highly treated. Gas-liquid separation is also performed in the first ozone reaction tower 306a, and the ozonized gas that has not been completely dissolved is decomposed into oxygen and made harmless via the first exhausted ozone gas pipe 313a, and then released to the atmosphere. The treated water is directly supplied to the second ozone reaction tower 306b via the first treated water pipe 305a, and is treated in the same manner.

The apparatus shown in FIG.
1. First and second treated water supply pumps 202a, 202
b, first and second treated water flow meters 203a and 203b, first and second ozone injection reactors 204a and 204b,
Second treated water pipes 205a, 205b, first and second gas-liquid separation tanks 206a, 206b, first and second gas flow meters 20
7a, 207b, ozone generator 208, first and second exhausted ozone gas pipes 209a, 209b, treated water flow path 21
7, ozone gas pipe 218, hydrogen peroxide storage tank 219,
Hydrogen peroxide supply pump 220, hydrogen peroxide supply pipe 22
1 is provided.

Next, the operation of this device will be described.
The water to be treated containing the polluted organic substance is first supplied from the treated water storage tank 201 to the first treated water pipe 205a and the first treated water flow meter 20 by the first treated water supply pump 202a.
It is supplied to the first ozone injection reactor 204a via 3a. Hydrogen peroxide is supplied to the hydrogen peroxide storage tank 2 through a hydrogen peroxide supply pipe 221 by a hydrogen peroxide supply pump 220.
It is introduced from 19 and added to the water to be treated. Further, an ozonized gas is branched from the ozone generator 208 via a pipe 218 and adjusted to a predetermined flow rate by a first gas flow meter 207a.
4a. In the ozone injection reactor 204a, the ozonized gas is dissolved, the dissolved ozone reacts with the added hydrogen peroxide to generate OH radicals, and the OH radicals and ozone remove the organic pollutants contained in the water to be treated. Decompose and remove water for advanced treatment. The treated water is gas-liquid separated in the first gas-liquid separation tank 206a, and the ozonized gas that cannot be completely dissolved is removed from the first exhausted ozone gas pipe 209.
It is released via a, is harmlessly decomposed into oxygen, and is then released into the atmosphere. The treated water is further supplied to the second ozone injection reactor 204b by the second treated water supply pump 202b into the second treated water pipe 205b and the second treated water flow meter 203.
b and processed in a similar manner.

However, the apparatus shown in FIGS. 17 and 18 has the following problems. That is, FIG.
In the device of No. 7, a high ozone dissolution rate could not be obtained, and it was impossible to increase the OH radical concentration, and there was a problem that the device was also increased in size. In the apparatus shown in FIG. 18, the number of the treated water supply pumps 20 is equal to the number of ozone injection points.
2a and 202b and the gas-liquid separation tanks 206a and 206b are required, and there are problems that the number of parts is large, the power is large, and the apparatus is also large.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has a high ozone dissolving property in a flow path in which a fluid to be treated or a mixed fluid obtained by mixing hydrogen peroxide with the fluid to be treated flows. When maintaining the speed and mixing hydrogen peroxide, increase the OH radical concentration to suppress the ineffective consumption of OH radicals and ozone, and divide ozone to promote the reaction between OH radicals and the substance to be treated. An object of the present invention is to provide an ozone contact method capable of injecting ozone in a divided manner, and having a small number of parts, a compact, economical and practical device configuration, and an apparatus therefor. It is an object of the present invention to provide a compact, economical and practical water treatment apparatus which has good efficiency in decomposing and removing harmful substances and is economical.

[0016]

According to the present invention, there is provided an ozone contact method according to the present invention, wherein a flow of a fluid to be treated or a mixed fluid obtained by mixing hydrogen peroxide with the fluid to be treated flows in a flow direction of the fluid to be treated or the mixed fluid. Create several negative pressure sections along
A fluid containing ozone is injected into each negative pressure portion.

In the ozone contact device of the present invention, the cross-sectional area of the flow passage in the flow path in which the fluid to be treated or the mixed fluid in which the hydrogen peroxide is mixed with the fluid to be treated flows is set in the flow direction of the fluid to be treated or the mixed fluid. A narrowed portion gradually reduced along, an enlarged portion whose flow path cross-sectional area is gradually expanded along the flow direction of the fluid to be treated or the mixed fluid, and a fluid containing ozone provided near the outlet of the narrowed portion. A plurality of ozone contact portions having an ozone injection port to be injected are arranged along the flow direction of the fluid to be processed or the mixed fluid, and the cross-sectional area of the flow passage at the outlet of the throttle portion is set to the flow of the fluid to be processed or the mixed fluid. They are sequentially enlarged along the direction.

Further, in the ozone contact device of the present invention, the cross-sectional shape orthogonal to the flow of the fluid to be treated or the mixed fluid in the flow channel and the cross-sectional shape orthogonal to the flow of the fluid containing ozone at the ozone inlet are circular. Wherein the diameter of the ozone inlet is smaller than the diameter of the outlet of the throttle.

Further, in the ozone contact device of the present invention, the cross-sectional shape of the flow path, which is orthogonal to the flow of the fluid to be treated or the mixed fluid, is circular, and the length of the enlarged portion and the diameter of the inlet of the throttle portion are different. The ratio (the length of the enlarged portion) / (the diameter of the entrance of the throttle portion) is a size of 2 or more and 9 or less.

Further, the ozone contact device of the present invention is provided with a gas-liquid mixing device, a gas-gas mixing device, or a liquid-liquid mixing device adjacent to the downstream side of the enlarged portion.

The water treatment apparatus of the present invention comprises the above-mentioned ozone contact device, and is configured to supply the water to be treated to the flow path of the ozone contact device.

Further, the water treatment apparatus of the present invention is provided with means for mixing hydrogen peroxide into the water to be treated supplied to the flow path of the ozone contact device.

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION The inventors of the present invention use a negative pressure to inject a fluid containing ozone into a plurality of locations in a flow path. It has been found that there is a close relationship between the pressure change in the flow path and the diameter of the outlet of the throttle section. Hereinafter, an embodiment of an ozone contact method, an apparatus therefor, and a water treatment apparatus according to the present invention will be described with reference to the drawings.

Embodiment 1 FIG. 1 is a sectional view showing the configuration of the ozone contact device according to Embodiment 1 of the present invention. In FIG. 1, reference numeral 1 denotes a flow passage through which a fluid to be treated or a mixed fluid of the fluid to be treated and hydrogen peroxide flows. In the present embodiment, the cross-sectional shape orthogonal to the flow of the fluid to be processed or the mixed fluid in the flow path 1 is circular. Hereinafter, a case will be described in which the fluid to be treated is wastewater and the fluid containing ozone is a gas containing ozone (hereinafter, referred to as ozonized gas). Reference numeral 11a denotes an inlet of a first throttle section, into which waste water or a mixed water in which hydrogen peroxide is mixed flows into the waste water. Hereinafter, the wastewater or the mixed water obtained by adding hydrogen peroxide to the wastewater may be simply referred to as water. Reference numeral 12a is a first throttle unit connected to the first throttle unit inlet 11a and having a flow passage cross-sectional area orthogonal to the flow of water, that is, a diameter gradually reduced along the flow direction of the water. Reference numeral 13a denotes a first throttle outlet, that is, a first throat. 14a is a first ozone inflow path. In the present embodiment, the cross-sectional shape orthogonal to the flow of the ozonized gas in the first ozone inflow passage 14a is circular, and the diameter is gradually reduced along the flow direction of the ozonized gas, and the diameter is minimized at the first ozone inlet 15a. Becomes 16a is the first throat 13a
And a first enlarged portion in which the cross-sectional area, that is, the diameter, of the flow path orthogonal to the flow of water is gradually increased along the flow direction of water. The first ozone inlet 15a is connected to the first throttle outlet 1
3a, that is, upstream of the first throttle outlet 13a or between the first throttle outlet 13a and the first enlarged portion 16a.

The first ozone contact portion 10a is formed by the first throttle portion inlet 11a, the first throttle portion 12a, the first throat portion 13a, the first ozone inflow passage 14a, the first ozone inlet 15a, and the first expanding portion 16a. And the first throttle section inlet 1
In the first throat 13a, the wastewater flowing from the wastewater 1a or the mixed water obtained by adding hydrogen peroxide to the wastewater is mixed with the ozonized gas injected from the first ozone inflow passage 14a through the first ozone inlet 15a. Then, mixing is promoted in the first enlarged portion 16a adjacent to the first throat portion 13a.

Further, in FIG. 1, reference numeral 11b denotes a second constricted portion inlet connected to the first enlarged portion 16a, into which drainage fluid from the first ozone contact portion 10a or a mixture of water and ozonized gas flows. I do. Reference numeral 12b denotes a second throttle portion whose flow path cross-sectional area, that is, diameter, orthogonal to the flow of water is gradually reduced along the flow direction of the water, and is connected to the second throttle portion inlet 11b. Reference numeral 13b denotes a second throttle outlet, that is, a second throat, which has a diameter larger than the diameter of the first throat 13a. 1
4b is a second ozone inflow path. In the present embodiment, the cross-sectional shape orthogonal to the flow of the ozonized gas in the second ozone inflow passage 14b is circular, and the diameter is gradually reduced along the flow direction of the ozonized gas, and the diameter is minimized at the second ozone inlet 15b. Becomes Reference numeral 16b is a second enlarged portion connected to the second throat portion 13b and having a flow path cross-sectional area, that is, a diameter, orthogonal to the flow of water, gradually expanded along the flow direction of the water. The second ozone inlet 15b is located near the second throttle outlet 13b, that is, upstream of the second throttle outlet 13b or the second throttle outlet 1b.
3b and the second enlarged portion 16b.

The second ozone contact portion 10b is formed by the second throttle portion inlet 11b, the second throttle portion 12b, the second throat portion 13b, the second ozone inflow passage 14b, the second ozone inlet 15b, and the second enlarged portion 16b. And the second throttle section inlet 1
The wastewater or mixed water from the first ozone contact tank 10a flowing from the first ozone contact tank 10a and the ozonized gas are supplied from the second ozone inflow passage 14b to the second ozone injection port 1b in the second throat 13b.
It is mixed again with the ozonized gas injected through 5b, and the mixing is promoted in the second enlarged portion 16b adjacent to the second throat 13b.

Hereinafter, the operation of the ozone contact device according to the present embodiment having such a configuration will be described in more detail with reference to FIG. FIG. 2 is an explanatory diagram showing a state of a pressure change in a flow path according to a flow direction of water flowing through the ozone contact device. The wastewater flowing into the first throttle inlet 11a or the mixed water obtained by adding a predetermined amount of hydrogen peroxide to the wastewater is accelerated from the first throttle 12a to the first throat 13a, and at this time, the static pressure is greatly reduced. Negative pressure.
After passing through the first throat 13a, the static pressure gradually recovers at the first enlarged portion 16a to become positive pressure. At this time, since the first throat 13a has a negative pressure, the ozonized gas is sucked from the first ozone inlet 15a. The ozonized gas injected from the first ozone injection port 15a becomes microbubbles in the first expansion section 16a, and the ozone is mixed and dissolved with the wastewater or the mixed water in which hydrogen peroxide is added to the wastewater. Although the bubbles are very fine near the first throat 13a, the bubbles increase as the diameter of the first enlarged portion 16a increases, and the negative static pressure recovers positively. Since very fine bubbles are generated in the first enlarged portion 16a, the ozone is dissolved at a high speed, and the dissolved ozone reacts with the harmful substance to be decomposed and removed. Alternatively, dissolved ozone and hydrogen peroxide react to generate OH radicals, and the OH radicals react with harmful substances to be decomposed and removed. Since the reaction rate between the OH radical and the harmful substance is very high, the reaction of the OH radical is completed in the first enlarged portion 16a.

Before the ozonized gas and the waste water or the mixed water are completely separated, they are guided to the second throttle portion 12b. Since the diameter of the second throat 13b is larger than the diameter of the first throat 13a, the first throat 13 is also provided before and after the second throat 13b.
As in the case a, a pressure difference occurs. Since the static pressure becomes negative again in the second throat 13b, the second ozone inlet 15b
More ozonized gas is sucked again. In addition, the first throat 1
The ozonized gas injected at 3a is re-micronized in the second throat 13b again, and the ozone dissolution efficiency increases. The waste water or the mixed water in which hydrogen peroxide is added to the waste water, the ozonized gas injected in the first throat 13a and the ozonized gas injected in the second throat 13b are formed in the second enlarged portion 16b.
At this time, they are mixed and dissolved as microbubbles, and the dissolved ozone and harmful substances react to be decomposed and removed. Alternatively, dissolved ozone reacts with hydrogen peroxide to generate OH radicals, and OH radicals react with harmful substances to be decomposed and removed.

As described above, the ozonized gas is divided into two points, for example, a half amount of the ozonized gas is injected from the first ozone inlet 15a, and the other half is injected from the second ozone inlet 15b. By injecting, the ozonized gas injected at the first point is refined again at the second ozone injection port 15b and redissolved, thereby increasing the ozone dissolving efficiency. In addition, the ozone treatment increases the efficiency of decomposing harmful substances. In addition, in the hydrogen peroxide-ozone combined treatment to which hydrogen peroxide is added, by injecting the ozonized gas separately, it becomes possible to suppress the ineffective consumption of ozone and OH radicals, and furthermore, the harmfulness due to OH radicals can be suppressed. The decomposition reaction of the substance is accelerated, and the efficiency of decomposing and removing harmful substances is increased.

FIG. 3 is a view for explaining the configuration of the water treatment apparatus according to the first embodiment of the present invention. The ozone contact apparatus schematically shown and the change in pressure in the flow path in accordance with the flow direction of the apparatus. It is shown together with the situation. FIG. 3A shows an ozone contact device similar to that described with reference to FIGS. 1 and 2 in which the cross-sectional area of the downstream throat is larger than that of the upstream throat. As a reference example, the case where the flow path cross-sectional area of the throat is made equal between the upstream side and the downstream side is shown. In FIG. 3, reference numeral 1 denotes a flow path through which waste water or a mixed water in which hydrogen peroxide is mixed with the waste water, 2, an ozone generator such as an ozonizer, 3, a treated water supply pump, 4, a hydrogen peroxide supply pump, 7. Is a hydrogen peroxide storage tank, 9a, 9
b is an ozone gas flow meter, 30 is a drain pipe, 33 is an ozone gas injection pipe, and 31 is a hydrogen peroxide injection pipe. Two ozone contact portions 10a and 10b are provided in the drainage flow path 1. The diameter of the throat on the upstream side is a, and the diameter of the throat on the downstream side is b.

The waste water is supplied to the flow path 1 (the ozone contact portions 10a and 10b) at a predetermined flow rate by the to-be-treated water supply pump 3, and hydrogen peroxide is supplied to the hydrogen peroxide storage tank 7 on the way.
The hydrogen peroxide is supplied from the hydrogen peroxide supply pump 4 through the hydrogen peroxide injection pipe 31. The ozonized gas generated by the ozone generator 2 is supplied to the ozone contact portions 10a and 10b through the ozone gas injection pipe 33. FIG.
As shown in (b), when the throat diameters are equal (a = b), the negative pressure is generated only in the downstream throat, and the ozonized gas is injected only in the downstream throat. Therefore, the ozonized gas cannot be injected at two points.
On the other hand, as shown in FIG. 3A, by making the diameter of the throat on the downstream side larger than the diameter of the throat on the upstream side (a <b), it is possible to generate a negative pressure in each throat. Thus, an ozonized gas can be injected into each throat. That is, it becomes possible to inject the ozonized gas at two points.

By generating negative pressure in the flow path 1 at two locations in this way, the ozonized gas can be divided into two locations and injected, and the ozonized gas injected into the throat on the upstream side can be injected. Is again refined and re-dissolved in the downstream throat. As a result, in the ozone treatment, the dissolution efficiency of ozone and the decomposition efficiency of harmful substances are increased, and in the combined treatment of hydrogen peroxide and ozone with added hydrogen peroxide, the dissolution efficiency of ozone is increased and the OH radicals and the ineffective consumption of ozone are reduced. In addition, the decomposition reaction of harmful substances by OH radicals is promoted, and the efficiency of decomposition and removal of harmful substances increases.

As described above, in the ozone contact device according to the present embodiment, the cross-sectional area of the flow path is changed in the flow direction of the waste water or the mixed water obtained by mixing the waste water with the hydrogen peroxide in the flow direction of the waste water or the mixed water. Apertures 12a, 12 gradually reduced along
b, enlarged portions 16a and 16b in which the cross-sectional area of the flow path is gradually enlarged along the flow direction of the drainage or mixed water, and an ozone inlet provided near the throttle outlets 13a and 13b and into which ozonized gas is injected. Two ozone contact portions 10a and 10b composed of 15a and 15b are arranged along the flow direction of the drainage or mixed water, and the cross-sectional areas of the flow passages of the throttle outlets 13a and 13b are set along the flow direction of the drainage or mixed water. By sequentially increasing the pressure, two negative pressure portions are created in the flow path 1 along the flow direction of the drainage or mixed water, and the ozonized gas is injected into each negative pressure portion.
Utilizing the pressure applied to flow the waste water or mixed water through the flow path 1, the ozonized gas can be dividedly injected into the flow path 1 while maintaining a high ozone dissolution rate, and hydrogen peroxide is added. In the combined use of hydrogen peroxide and ozone, it is possible to suppress the ineffective consumption of ozone and OH radicals, further promote the decomposition reaction of harmful substances by OH radicals, and increase the efficiency of decomposition and removal of harmful substances. A compact, economical and practical ozone contact device with a small number of parts can be obtained. Further, when such an ozone contact device is used for water treatment, it is possible to obtain a compact, economical and practical water treatment device that can effectively utilize ozone, has a high efficiency of decomposing and removing harmful substances, and has a high efficiency. it can.

FIG. 4 shows the throat diameter ratio (upstream throat diameter / downstream throat diameter) and the G / L (gas-liquid ratio) in the upstream throat when the ozonized gas is injected at two points. FIG. 9 is a diagram of an experimental result showing the relationship of FIG. The experimental conditions were as follows.
In each of the cases of 5 mm, 4.5 mm, and 5.5 mm, the downstream throat diameter was changed from 2.0 mm to 6.0 mm in 0.5 mm steps. At this time, the ozone concentration was 100 g / m ³ , the hydrogen peroxide injection rate was 10 mg / L, and the flow rate of the water to be treated was 0.00006 to
It is in the range of 0.0003 m ³ / sec. The TOC concentration of the water to be treated is 10 mg / L. When the throat diameter is equal on the upstream side and the downstream side, that is, when the ratio of the throat diameter is 1, gas is not absorbed in the upstream throat. However, by making the diameter of the throat on the downstream side larger than the diameter of the throat on the upstream side, that is, by making the ratio of the diameter of the throat larger than 1, the ozonized gas can be injected also on the upstream side. Gas can be injected. Therefore, in order to split and inject ozonized gas, the ratio of the throat diameter is 1 as shown in FIG.
It is better to be larger than 3 and preferably larger than 1 and smaller than 2.

FIG. 5 summarizes the flow rate of the water to be treated and the pressure at the inlet of the most upstream throttling portion when the ozonized gas is injected at two locations, with respect to the diameter of the most upstream throat. Further, Table 1 shows the conditions of the experimental results shown in FIG. 5 with respect to the diameter of the throat on the downstream side relative to the diameter of the throat on the upstream side. The experimental condition at this time was an ozone concentration of 100 g.
/ M ³ , the hydrogen peroxide injection rate was set at 10 mg / L, and the flow rate ratio (G / L) between the ozonized gas and the water to be treated was set at 0.1. The flow rate of the water to be treated is 0.00006 to 0.0
003 m ³ / sec. In addition, T
The OC concentration is 10 mg / L. As shown in FIG. 5, regardless of the size of the throat diameter on the downstream side in each upstream throat diameter, the pressure at the most upstream side throttling section inlet is secondary to the flow rate of the water to be treated. Increase functionally. Than this,
The relationship between the treatment flow rate of the target water to be treated and the pressure at the inlet of the throttle at the most upstream side of the water to be treated is determined by the diameter of the most upstream side throat, and is related to the size of the diameter of the throat downstream. I understand that there is no.

That is, the flow rate of the water to be treated and the power of the water supply pump 3 determine the throat diameter at the uppermost stream side from FIGS. 4 and 5, and subsequently, the divided ozone gas is injected. The downstream throttle diameter is determined.

[0038]

[Table 1]

FIG. 6 shows the result of gradually increasing the ratio of the diameter of the ozone inlet to the diameter of the throat under the condition that the G / L (gas-liquid ratio) is kept at 0.5. The experimental conditions at this time were an ozone concentration of 100 g / m ³ , a hydrogen peroxide injection rate of 10 mg / L,
The flow rate of the water to be treated is 0.00006 to 0.0003 m ³ /
sec. The TOC concentration of the water to be treated is 1
0 mg / L. The ratio of the ozone inlet diameter to the throat diameter is 1
If it exceeds, the suction amount of ozonized gas is greatly reduced. Thus, the diameters of the ozone inlets 15a and 15b are changed to the throat 13a,
If the diameter of the ozone gas inlet 13a (or 13b) is larger than the diameter of the throat portion 13a (or 13b), the suction force of the ozonized gas becomes smaller and the G / L becomes smaller. It is preferable that the diameter be smaller than the diameter of ()).

The narrowing angle of the first narrowing portion 12a and the second narrowing portion 12b is 10 to 30 degrees, preferably 15 to 2 degrees.
5 degrees is good. In the other range, the pressure change becomes too steep or slow, and the energy loss increases.

FIG. 7 shows the ratio of the length of the enlarged portions 16a and 16b to the diameter of the narrowed portion inlets 11a and 11b (length of the enlarged portion / diameter of the narrowed portion inlet) and the bubble diameter of the injected ozonized gas. FIG. 8 shows the relationship between the ratio between the lengths of the enlarged portions 16a and 16b and the diameters of the inlets 11a and 11b of the narrowed portions and ΔTOC (decomposed organic substance concentration). The experimental conditions at this time were an ozone concentration of 100 g / m ³ , a hydrogen peroxide injection rate of 10 mg / L, a flow rate ratio (G / L) between ozone gas and the water to be treated of 0.1, and a flow rate of the water to be treated of 0. .0000
The range is 6 to 0.0003 m ³ / sec. The TOC concentration of the water to be treated is 10 mg / L.

FIG. 7 shows that when the ratio of the lengths of the enlarged portions 16a and 16b to the diameters of the narrowed portion inlets 11a and 11b exceeds 9, the bubble diameter rapidly increases. That is, if the ratio of the length of the enlarged portions 16a, 16b to the diameter of the narrowed portion inlets 11a, 11b exceeds 9, the bubble diameter becomes large and the injected ozonized gas and wastewater are separated, and gas-liquid contact occurs. The area becomes smaller and the dissolution rate of ozone decreases. In addition, in the enlarged portions 16a and 16b, in addition to the dissolution of the ozonized gas,
It is necessary to promote the decomposition reaction of harmful substances by ozone and OH radicals. Therefore, as shown in FIG.
If the ratio of the lengths of the openings 6a and 16b to the diameters of the inlets 11a and 11b is less than 2, the volumes in the enlarged portions 16a and 16b become small, and the decomposition reaction by ozone and OH radicals does not proceed sufficiently, resulting in a sufficient TOC. Cannot be obtained. Accordingly, the lengths of the enlarged portions 16a and 16b and the throttle portion entrances 11a and
The ratio to the diameter of 11b (the length of the enlarged portion 16a (or 16b) / the diameter of the narrowed portion entrance 11a (or 11b)) is preferably 2 or more and 9 or less. In practice, the diameters of the inlets 11a and 11b of the constricted portions are generally the same as the diameter of the water pipe 30 to be treated. Therefore, the length of the enlarging portion 16a is determined so as to satisfy this ratio, and the enlarging is performed. By connecting the next throttle portion 12b downstream of the portion 16a and dispensing the ozonized gas, the reaction between OH radicals and harmful substances can be efficiently promoted. However, this does not apply to the case where a gas-liquid mixing device 17 such as a static mixer as shown in FIG. 9 is mounted adjacent to the downstream side of the enlarged portions 16a and 16b. FIG. 9 will be described later in detail in Embodiment 2.

In the above-described embodiment, the apertures 12a,
Entrances 11a, 11b of 12b and enlarged portions 16a, 16
The outlet b has the same diameter but does not have to be. In addition, there is a portion having a constant channel cross-sectional area between the first enlarged portion 16a and the second throttle portion 12b, but this portion is not necessarily required. Further, a material having ozone resistance is used for the entire ozone contact device, for example, stainless steel (SUS), acrylic, vinyl chloride, or the like is used. It is desirable that the cross-sectional shape of the flow path 1 orthogonal to the flow of the fluid to be processed or the mixed fluid be circular.
The present invention is not limited to this, and may be, for example, an elliptical shape or another shape. Also, the first and second
The ozone contact portions 10a and 10b may be connected by a flange, or may be integrated. Further, although not shown in the figure, similarly to the case of FIG. 15, a gas-liquid separation tank is provided after the second ozone contact portion 10b to perform gas-liquid separation, and ozone that cannot be completely dissolved in the water to be treated is discharged as ozone. As a result, it is harmlessly decomposed into oxygen by a waste ozonolysis device filled with an ozonolysis catalyst and released to the atmosphere.

Embodiment 2 FIG. 9 is a sectional view showing a configuration of an ozone contact device according to Embodiment 2 of the present invention. In FIG. 9, reference numeral 17 denotes a gas-liquid mixing device (gas-liquid mixing device) such as a static mixer. Since the bubble diameter of the ozonized gas injected from the ozone injection ports 15a and 15b increases as it flows down the enlarged portion, the enlarged portion 16
By disposing the gas-liquid mixing device 17 adjacent to the downstream side of a and 16b, the expansion of the bubble diameter can be suppressed, and the ozone dissolution efficiency can be increased. As a result, ozone can be effectively used, the amount of generated OH radicals increases, and the efficiency of decomposing harmful substances improves.

Embodiment 3 In the first embodiment, the case where two ozone contact portions are provided along the flow direction of the drainage or mixed water has been described. However, three ozone contact portions may be provided as shown in FIG. It may be. FIG. 10 is a diagram for explaining a configuration of a water treatment apparatus according to Embodiment 3 of the present invention, and is shown together with a schematic representation of an ozone contact device and a state of a pressure change in a flow path in accordance with the flow direction thereof. ing. FIG. 10 (a) is a water treatment apparatus according to Embodiment 3 of the present invention in which the flow path cross-sectional area of the throat is sequentially increased along the flow direction, and FIG. 10 (b) is a reference example of the flow path cross-sectional area of the throat Are equal to each other. In FIG. 10, 10a is the first ozone contact portion counted from the upstream side, 10b is the second ozone contact portion,
10c is a third ozone contact portion. Let the throat diameter of the first ozone contact portion 10a be a
Let the throat diameter of b be b, and the throat diameter of the third ozone contact portion 10c be c.

The waste water is supplied to the passage 1 (ozone contact portions 10a, 10b, 10
c), hydrogen peroxide is supplied from the hydrogen peroxide storage tank 7 by the hydrogen peroxide supply pump 4 through the hydrogen peroxide injection pipe 31 on the way. Further, the ozonized gas generated by the ozone generator 2 is passed through the ozone gas injection pipe 33 to each of the ozone contact portions ozone contact portions 10a and 10a.
b, 10c. As shown in FIG. 10B, when the throat diameters are equal (a = b = c), the negative pressure is generated only in the most downstream throat, and only in the most downstream throat. The ozonized gas is injected, and the ozonized gas cannot be injected at three points. On the other hand, FIG.
As shown in (a), by increasing each throat diameter toward the downstream side (a <b <c), it is possible to generate a negative pressure in each throat, and ozonation in each throat Gas can be injected. That is, it becomes possible to inject the ozonized gas at three points.

By generating three negative pressures in the flow path 1 in this manner, the ozonized gas can be divided and injected, and the ozonized gas injected into the first ozone contact portion 10a can be injected. Are again miniaturized and redissolved in the second ozone contact portion 10b and further in the third ozone contact portion 10c. As a result, the dissolution efficiency of ozone and the decomposition efficiency of harmful substances are increased in the ozone treatment, and the dissolution efficiency of ozone is increased and the ineffective consumption of OH radicals and ozone is suppressed in the combined treatment of hydrogen peroxide and ozone with the addition of hydrogen peroxide. As a result, the decomposition reaction of harmful substances by OH radicals is promoted, and the efficiency of decomposition and removal of harmful substances is increased.

Embodiment 4 In each of the above embodiments, for example, as shown in FIGS. 1 and 9, the ozone inflow paths 14a and 14b are provided so as to be perpendicular to the flow direction of the drainage or mixed water (that is, the flow path direction). However, the ozone inflow path may be provided so as to extend along the direction of the flow path 1, for example. FIG. 11 is a cross-sectional view illustrating a configuration of a main part of an ozone contact device according to Embodiment 4 of the present invention, and specifically illustrates an ozone contact portion. In FIG. 11, reference numeral 10 denotes an ozone contact portion, 11 denotes a throttle inlet, 12 denotes a throttle, 13 denotes a throttle outlet, that is, a throat,
4 is an ozone inflow path, 15 is an ozone inlet, and 16 is an enlarged portion. The ozone inlet 15 is provided in the vicinity of the throttle outlet 13. In the ozone contact device according to the present embodiment, a plurality of ozone contact portions 10 having such a configuration are arranged along the flow direction of a fluid to be treated or a mixed fluid obtained by mixing hydrogen peroxide with the fluid to be treated, Exit 11
The cross-sectional area of the flow path orthogonal to the flow of the water is sequentially increased along the flow direction of the fluid to be treated or the mixed fluid.

In the present embodiment, as in the case of the first embodiment, the ozone dissolution rate is increased in the flow channel by utilizing the pressure applied to flow the drainage or mixed water through the flow channel 1. The ozone gas can be divided and injected while maintaining the above conditions, which increases the ozone dissolution efficiency in the case of ozone treatment, and reduces the ineffective consumption of ozone and OH radicals in hydrogen peroxide-ozone combined treatment with the addition of hydrogen peroxide. It is possible to obtain a compact, economical and practical ozone contact device with reduced number of parts, which can promote the decomposition reaction of harmful substances by OH radicals. Can be. Further, when such an ozone contact device is used for water treatment, it is possible to obtain a compact, economical and practical water treatment device that can effectively utilize ozone, has a high efficiency of decomposing and removing harmful substances, and has a high efficiency. it can.

Embodiment 5 In each of the above embodiments, the case where the fluid containing ozone injected from the ozone injection ports 15, 15a, 15b of the ozone contact sections 10, 10a, 10b, 10c is ozonized gas is described. Ozone water dissolved in water or a mixture of ozone water and ozonized gas may be used, and the same or better effects as in the above embodiments can be obtained.

FIG. 12 is a view for explaining a configuration of a main part of a water treatment apparatus according to Embodiment 5 of the present invention, and specifically shows a configuration for producing ozone water. FIG.
2, reference numeral 36 denotes a treated water pipe through which the treated water flows, 37 denotes an ozone water pipe, 38 denotes an exhausted ozone gas pipe,
40 is a treated water supply pump, 41 is a reaction tower, and 42 is an ozone water producing apparatus such as a diffuser. Next, the production of ozone water will be described. The treated water subjected to the water treatment is introduced into the reaction tower 41 from the treated water pipe 36 by the treated water pump 40. On the other hand, the ozonized gas passes from the ozonizer 2 such as an ozonizer to the air diffuser 42 through the ozonized gas pipe 33.
The water is then injected into the reaction tower 41 and dissolved in the treated water to become ozone water, which is led out from the ozone water pipe 37. The undissolved ozonized gas is led out from the exhausted ozone gas pipe 38, harmlessly decomposed into oxygen by an exhausted ozone decomposing device (not shown), and released to the atmosphere. In the water treatment apparatus according to the present embodiment, the ozone water pipe 37 is connected to the ozone inflow path of the ozone contact device described in each of the above embodiments via a flow meter, and the ozonized gas is replaced with the ozonized gas of each of the above embodiments. Ozone water is injected.

When this embodiment is applied to the second embodiment, that is, when ozone water is used instead of the gas containing ozone in the second embodiment, the liquid is provided adjacent to the downstream side of the enlarged portion. -Arrange a liquid mixing device; This is the same in the following sixth embodiment.

Embodiment 6 FIG. 13 (a) and 13 (b) are diagrams for explaining the configuration of a main part of a water treatment apparatus according to Embodiment 6 of the present invention. Specifically, FIG. 13 (a) and FIG. 13 (b) show a mixture of ozone water and ozonized gas. 1 shows a configuration for manufacturing. In FIG. 13, reference numeral 39 denotes a mixed fluid pipe from which a mixed fluid obtained by mixing ozone water and ozonized gas is led out;
3a and 43b are ozone contactors such as ejectors. Next, production of a mixed fluid in which ozone water and an ozonized gas are mixed will be described. In FIG. 13A, the treated water that has been subjected to the water treatment is supplied from the treated water pipe 36 to the respective ozone contactors 43a and 43b by the treated water pump 40. On the other hand, the ozonized gas is supplied from the ozone generator 2 such as an ozonizer to the respective ozone contactors 43a and 43b through the ozonized gas pipe 33, and a part of the ozonized gas is dissolved in the treated water to form the ozone water and the ozonized gas. And is discharged from the ozone water pipe 37. In FIG. 13B, the number of the ozone contactors 43 is one, and the mixed fluid pipe 39 is forked in the middle. In the water treatment apparatus according to the present embodiment, the mixed fluid pipe 39 is connected to the ozone inflow path of the ozone contact device described in each of the above embodiments via a flow meter, and is replaced with the ozonized gas of each of the above embodiments. As a result, a mixed fluid of ozone water and ozonized gas is injected.

In each of the above embodiments, the case where the fluid to be treated is wastewater is described. However, the present invention is not limited to this, and the fluid to be treated may be, for example, water such as sewage, groundwater, or leachate. Good. Further, it may be a gas such as an exhaust gas from an incineration (combustion) furnace, and harmful substances such as dioxins in the gas can be decomposed and removed by the action of ozone or OH radicals as in the case of a liquid. In addition, when hydrogen peroxide is mixed with a gas, for example, a method of spraying hydrogen peroxide into a gas in a spray state may be considered. In the second embodiment, when the fluid to be treated is a gas, an air-gas mixing device is disposed adjacent to the downstream side of the enlarged portion, and the fluid to be treated is a gas, and ozone water is used instead of the ozonized gas. When a mixed fluid of ozone water and ozonized gas is used, a gas-liquid mixing device is arranged adjacent to the downstream side of the enlarged portion.

For reference, in addition to the water treatment apparatus shown in each of the above embodiments, an apparatus shown in FIGS. 19 and 20 can be considered. In FIG. 19, reference numerals 50a and 50b denote ozone gas diffusing devices, and other reference numerals denote the same components as those in FIG. Next, the operation will be described.
The wastewater is supplied to the flow path 1 at a predetermined flow rate by the supply pump 3, and on the way, hydrogen peroxide is supplied by the hydrogen peroxide injection pump 4 from the hydrogen peroxide storage tank 7 through the hydrogen peroxide injection pipe 31, Mixed with drainage. The flow rate of the ozone gas generated by the ozone generator 2 is adjusted by the flow meters 9a and 9b through the ozone gas pipe 33 and supplied to the respective ozone gas diffusers 50a and 50b. When ozone gas is diffused and dissolved in waste water containing hydrogen peroxide, OH radicals are generated, and ozone and O
H radicals decompose by reacting with harmful substances.

In FIG. 20, reference numeral 35 denotes a branch flow path, 51 denotes a pump for branching drainage, 52a and 52b denote flow meters in the branch flow path, 53a and 53b denote ozone contactors such as ejectors, etc. Indicates the same one as in FIG. Next, the operation will be described. Hydrogen peroxide is stored in a hydrogen peroxide storage tank 7 in the wastewater flowing down the main channel 1 of the wastewater.
Further, the hydrogen peroxide is injected through the hydrogen peroxide injection pipe 31 by the hydrogen peroxide injection pump 4. A part of drainage of the main flow path 1 is branched by a pump 51 through a pipe 35. Here, the hydrogen peroxide may be supplied not to the main channel 1 but to the branch channel 35. The wastewater into which the hydrogen peroxide has been injected is further branched into two, adjusted to a predetermined flow rate by flow meters 52a and 52b, and supplied to the respective ozone contactors 53a and 53b. Ozone gas generated by the ozone generator 2 in the ozone contactors 53a and 53b is adjusted to a predetermined amount by the flow meters 9a and 9b, injected through the ozone gas pipe 33, and mixed with waste water containing hydrogen peroxide. Each branch flow is returned to the main flow path 1 with an interval larger than the diameter of the main flow path 1. If this interval is smaller than the diameter of the main channel 1, the harmful substances after the branch channel 35 is returned to the main channel 1 will not be sufficiently decomposed.

[0057]

According to the ozone contact method of the present invention, the flow of the fluid to be treated or the mixed fluid obtained by mixing hydrogen peroxide with the fluid to be treated flows along the flow direction of the fluid to be treated or the mixed fluid. Since multiple negative pressure parts are created and a fluid containing ozone is injected into each negative pressure part, high ozone dissolution occurs in the flow path in which the fluid to be treated or the mixed fluid in which hydrogen peroxide is mixed with the fluid to be treated flows. The ozone-containing fluid can be divided and injected at a constant speed, whereby the ozone dissolution efficiency is increased in the case of ozone treatment, and ozone or O 2 is added in the hydrogen peroxide-ozone combined treatment in which hydrogen peroxide is added.
It is possible to suppress the ineffective consumption of H radicals, further promote the decomposition reaction of harmful substances by OH radicals, increase the efficiency of decomposition and removal of harmful substances, and reduce the number of parts, compact, economical and practical An ozone contact method that can be configured as an apparatus is obtained.

According to the ozone contact device of the present invention, the flow passage through which the fluid to be treated or the mixed fluid obtained by mixing hydrogen peroxide with the fluid to be treated flows is formed so that the cross-sectional area of the passage is equal to the flow of the fluid to be treated or the mixed fluid. A squeezing section that gradually shrinks along the direction,
Ozone contact having an enlarged portion in which the cross-sectional area of the flow path is gradually enlarged along the flow direction of the fluid to be treated or the mixed fluid, and an ozone inlet provided near the outlet of the throttle portion and into which a fluid containing ozone is injected. Since a plurality of sections are arranged along the flow direction of the fluid to be processed or the mixed fluid, and the cross-sectional area of the flow path at the outlet of the throttle section is sequentially increased along the flow direction of the fluid to be processed or the mixed fluid, The ozone-containing fluid can be dividedly injected at a high ozone dissolution rate into the flow path in which the mixed fluid obtained by mixing hydrogen peroxide with the fluid or the fluid to be treated is injected, thereby increasing the ozone dissolution efficiency in the case of ozone treatment. In addition, in the hydrogen peroxide-ozone combined treatment to which hydrogen peroxide has been added, it is possible to suppress the ineffective consumption of ozone and OH radicals, and to further decompose harmful substances by OH radicals. Response is promoted, whereby the degradation efficiency of removing harmful substances, yet with less compact parts may be economical and practical device construction.

According to the ozone contact device of the present invention,
The cross-sectional shape orthogonal to the flow of the fluid to be processed or the mixed fluid in the flow path and the cross-sectional shape orthogonal to the flow of the ozone-containing fluid at the ozone injection port are circular, and the diameter of the ozone injection port is reduced by the throttle section. Since the diameter is smaller than the diameter of the outlet, a sufficient ozone suction force can be obtained.

According to the ozone contact device of the present invention,
The cross-sectional shape orthogonal to the flow of the fluid to be processed or the mixed fluid in the flow channel is circular, and is a ratio of the length of the enlarged portion to the diameter of the entrance of the constricted portion (length of the enlarged portion) / (constricted portion) Since the diameter of the inlet is 2 or more and 9 or less, a decrease in the dissolution rate of ozone can be prevented, and the decomposition reaction of harmful substances by ozone and OH radicals can be sufficiently advanced.

According to the ozone contact device of the present invention,
A gas-liquid mixing device, a gas-liquid mixing device,
Since the gas mixing device or the liquid-liquid mixing device is provided, the dissolving efficiency of ozone can be increased, and the decomposition reaction of harmful substances by ozone and OH radicals can be sufficiently advanced.

According to the water treatment apparatus of the present invention, since the ozone contact device as described above is provided and the water to be treated is supplied to the flow path of the ozone contact device, ozone can be effectively used. A compact, economical and practical water treatment device with good efficiency of decomposing and removing harmful substances can be obtained.

Further, according to the water treatment apparatus of the present invention, since there is provided a means for mixing hydrogen peroxide into the water to be treated, which is supplied to the flow path of the ozone contact device, OH having a stronger oxidizing power than ozone is provided. Radicals can be generated, ozone and OH radicals can be suppressed from being ineffectively consumed by dividing and injecting ozone, and the reaction between harmful substances and OH radicals can be promoted. A compact, economical and practical water treatment device is obtained.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a configuration of an ozone contact device according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram showing a state of a pressure change in a flow path in the ozone contact device of FIG. 1 according to the first embodiment of the present invention.

FIG. 3 is a diagram for explaining a configuration of a water treatment device according to the first embodiment of the present invention.

FIG. 4 is a characteristic diagram for explaining the relationship between the throat diameter ratio and the gas-liquid ratio in the upstream throat when injecting ozonized gas at two locations according to the first embodiment of the present invention.

FIG. 5 is a characteristic diagram according to the first embodiment of the present invention, for explaining the relationship between the flow rate of water to be treated and the pressure at the inlet of the most upstream throat at each throat diameter on the most upstream side.

FIG. 6 is a characteristic diagram for explaining the relationship between the ratio of the ozone injection port to the throat diameter and the gas-liquid ratio according to the first embodiment of the present invention.

FIG. 7 is a characteristic diagram for explaining the relationship between the ratio of the length of the enlarged portion and the diameter of the entrance of the throttle portion and the bubble diameter of the injected ozonized gas according to the first embodiment of the present invention.

FIG. 8 is a characteristic diagram for explaining the relationship between ΔTOC and the ratio of the length of the enlarged portion to the diameter of the narrow portion entrance according to the first embodiment of the present invention.

FIG. 9 is a sectional view illustrating a configuration of an ozone contact device according to a second embodiment of the present invention.

FIG. 10 is an explanatory diagram showing a configuration of an ozone contact device according to Embodiment 3 of the present invention and a state of a pressure change in a flow channel.

FIG. 11 is a sectional view showing a configuration of a main part of an ozone contact device according to a fourth embodiment of the present invention.

FIG. 12 is a diagram illustrating a configuration of a main part of a water treatment apparatus according to a fifth embodiment of the present invention.

FIG. 13 is a diagram for illustrating a configuration of a main part of a water treatment apparatus according to a sixth embodiment of the present invention.

FIG. 14 is a diagram illustrating a configuration of a conventional water treatment apparatus.

FIG. 15 is a diagram illustrating a configuration of another conventional water treatment apparatus.

FIG. 16: TOC due to difference in the number of ozonized gas injection points
It is a figure explaining change of.

FIG. 17 is a diagram illustrating an example of a specific configuration of a water treatment apparatus generally considered to inject ozonized gas at two points.

FIG. 18 is a diagram illustrating another example of a specific configuration of a water treatment apparatus generally considered to inject ozonized gas at two points.

FIG. 19 is a diagram illustrating a configuration of a water treatment device according to a reference example.

FIG. 20 is a diagram illustrating another configuration of the water treatment apparatus according to the reference example.

[Description of Signs] 1 flow path, 2 ozone generator, 3 water supply pump for treated water, 4 hydrogen peroxide addition pump, 5a to 5d ozonized gas inlet, 6 waste ozone decomposer, 7 hydrogen peroxide storage tank, 8 gas-liquid separation tank, 9a to 9d ozonized gas flow meter, 10, 10a, 10b, 10c ozone contact section, 11, 11a, 11b throttle section inlet, 12, 12
a, 12b throttle, 13, 13a, 13b throat, 1
4, 14a, 14b Ozone inflow path, 15, 15a, 1
5b ozone inlet, 16, 16a, 16b enlarged section,
17 gas-liquid mixing device, 30 treated water piping, 31 hydrogen peroxide injection piping, 32 treated water piping, 33 ozonized gas piping, 34 exhaust ozone gas piping, 35 branch flow path, 3
6 treated water piping, 37 ozone water piping, 38 exhausted ozone gas piping, 40 treated water supply pump, 41 diffuser,
42 ozone contactor, 50a, 50b ozone gas diffuser, 51 pump for branching drainage, 52a,
52b Flow meter of branch channel, 53a, 53b Ozone contactor, 100 Ozone generator, 101 Sealed tank,
102 water surface, 103 pump, 104 pipe, 10
5 cover, 106 Venturi tube, 107 air inlet,
108 space part, 109 discharge pipe, 110 treated water, 111 gas supply hole, 201 treated water storage tank, 202a, 202b treated water supply pump, 203
a, 203b Treated water flow meter, 204a, 204b
Ozone injection reactor, 205a, 205b Treated water pipe, 206a, 206b Gas-liquid separation tank, 207a, 20
7b gas flow meter, 208 ozone generator, 209a,
209b Exhaust ozone gas pipe, 217 Treated water flow path, 2
18 Ozone gas piping, 219 Hydrogen peroxide storage tank, 2
20 Hydrogen peroxide supply pump, 221 Hydrogen peroxide supply pipe.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Junji Hirotsuji 2-3-2 Marunouchi, Chiyoda-ku, Tokyo F-term in Mitsubishi Electric Corporation (reference) 4D050 AA02 AA03 AA13 AA15 AA20 BB02 BB09 BD03 BD06 4G035 AA01 AC23

Claims (7)

[Claims] 1. A plurality of negative pressure portions are formed in a flow path through which a fluid to be treated or a mixed fluid obtained by mixing hydrogen peroxide with the fluid to be treated flows along a flow direction of the fluid to be treated or the mixed fluid. A fluid containing ozone is injected into the negative pressure portion of the ozone. 2. A cross-sectional area of a flow passage in which a fluid to be treated or a mixed fluid obtained by mixing hydrogen peroxide with the fluid to be treated flows is gradually reduced along a flow direction of the fluid to be treated or the mixed fluid. A throttle portion, an enlarged portion in which the cross-sectional area of the flow path is gradually increased along the flow direction of the fluid to be processed or the mixed fluid, and an ozone inlet provided near the outlet of the throttle portion and into which a fluid containing ozone is injected. A plurality of ozone contact portions having the same are arranged along the flow direction of the fluid to be treated or the mixed fluid, and the cross-sectional area of the flow path at the outlet of the throttle unit is sequentially increased along the flow direction of the fluid to be treated or the mixed fluid. An ozone contact device characterized in that: 3. A cross-sectional shape orthogonal to the flow of the fluid to be processed or the mixed fluid in the flow path and a cross-sectional shape orthogonal to the flow of the fluid containing ozone at the ozone injection port are circular. The ozone contact device according to claim 2, wherein a diameter of the ozone contact device is smaller than a diameter of the throttle unit outlet. 4. A cross-sectional shape orthogonal to the flow of the fluid to be processed or the mixed fluid in the flow path is circular, and is a ratio of the length of the enlarged portion to the diameter of the entrance of the throttle portion (the length of the enlarged portion). The ozone contact device according to claim 2 or 3, wherein the ratio (sa) / (diameter of the inlet of the throttle unit) is 2 or more and 9 or less. 5. A gas-liquid mixing device, a gas-gas mixing device, or a liquid-liquid mixing device is provided adjacent to the downstream side of the enlarged portion. An ozone contact device according to item 1. 6. A water treatment apparatus comprising the ozone contact device according to any one of claims 2 to 5, wherein water to be treated is supplied to a flow path of the ozone contact device. 7. The water treatment apparatus according to claim 6, further comprising means for mixing hydrogen peroxide into the water to be treated supplied to the flow path of the ozone contact device.