JP2007260598A - Method and apparatus for treating polluted water by ozone microbubble - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and apparatus for treating polluted water by ozone microbubbles which can sufficiently improve reaction efficiency between polluted water and ozone. <P>SOLUTION: The polluted water treatment apparatus 100 comprises an ozone reaction tank 1, a feed pipe 2, a discharge pipe 3, an ozone generator 4, a microbubble generator 5, an ozone supply means 6, an introduction pipe 7, and lead-out pipe 8.The total inflow of the polluted water into the ozone reaction tank 1 through the feed pipe 2 and the lead-out pipe 8, and the outflow of the polluted water from the ozone reaction tank 1 through the discharge pipe 3 are regulated to form a downflow having a flow rate equal to or higher than the rising speed of the ozone microbubble (for example, 1 mm/s or more) in the polluted water in the ozone reaction tank 1. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a method for treating contaminated water using ozone fine bubbles, which reacts the contaminated water with ozone fine bubbles to treat organic substances contained in the contaminated water, and a treatment apparatus for contaminated water using ozone fine bubbles, and more particularly to contaminated water. It is related with the processing method of the contaminated water by the ozone fine bubble for improving the reaction efficiency of ozone and ozone, and the processing apparatus of the contaminated water by the ozone fine bubble.

  Examples of contaminated water containing organic matter include livestock wastewater, waste disposal site leachate, and wastewater from biomass. These contaminated waters contain a large amount of organic substances such as humic acid. For example, COD (Chemical Oxygen Demand) = 1500 to 7000 mg / L, BOD (Biochemical Oxygen Demand; biochemical oxygen) Requested amount) = 300 to 1700 mg / L. Such contaminated water also has high SS and chromaticity, and for example, shows SS (Suspended Solid) = 400-18000 mg / L, chromaticity = 2000-3000.

  In order to treat organic substances contained in such contaminated water, for example, there is a technique for removing organic substances by subjecting the contaminated water to film treatment or coagulation precipitation treatment. However, with these techniques, the amount of medicine used increases and costs increase. Also, with these techniques, organic substances contained in the contaminated water cannot be sufficiently removed, and it has been particularly difficult to make the chromaticity below a predetermined reference value.

Therefore, in recent years, a technique for treating organic substances contained in contaminated water by reacting contaminated water with ozone has been developed. This technique is a technique in which ozone is aerated in contaminated water and organic substances are treated by the oxidizing action of ozone, and is excellent in that it is not necessary to use a chemical separately. However, aerated ozone has a large bubble diameter, and therefore has a fast ascent rate in the contaminated water and is difficult to dissolve in the contaminated water. As a result, in this technique, the contaminated water and ozone cannot be reacted efficiently. Particularly, in order to make the chromaticity below a predetermined reference value (for example, 100 or less), a large amount of ozone is injected. It was necessary. More specifically, ozone of about 1200 to 2000 g per 1 m ^{3 of} contaminated water was required to reduce the polluted water having a chromaticity of 200 to 400 to 100 or less. For this reason, the technology for aeration of ozone into contaminated water increases the equipment cost and running cost for producing ozone. In addition, since the exhaust gas obtained at that time contains a large amount of undissolved ozone in the contaminated water, and ozone is harmful, equipment for treating ozone in the exhaust gas (for example, ozone decomposition) A device, an ozone adsorption device, etc.) are also required, which increases the cost.

Conventionally, in order to solve such a problem, a technique for treating organic substances contained in contaminated water by reacting contaminated water with fine ozone bubbles has been developed (see, for example, Patent Document 1). Ozone fine bubbles have a remarkably small bubble diameter (50 μm or less in diameter) compared to aerated ozone, and therefore the floating speed in the contaminated water is slow, and the ozone fine bubbles are easily dissolved in the contaminated water. Therefore, according to such a conventional technique, the reaction efficiency between the contaminated water and ozone is temporarily improved, and as a result, the cost can be reduced.
JP 2001-259667 A

  However, even if ozone fine bubbles are supplied to the contaminated water, the ozone fine bubbles float up in the contaminated water at a predetermined speed, and some of them do not dissolve in the contaminated water. Therefore, in the conventional technique, the reaction efficiency between the contaminated water and ozone cannot be sufficiently improved.

  The present invention has been made in view of the above-mentioned problems, and the object thereof is a method for treating contaminated water using ozone fine bubbles, which can sufficiently improve the reaction efficiency between contaminated water and ozone, and ozone fine bubbles. It is in providing the processing apparatus of the contaminated water by.

  In order to solve the above-mentioned problem, the present invention is a treatment method of contaminated water by ozone fine bubbles that reacts contaminated water containing organic matter with ozone fine bubbles to treat the organic matter, A downward flow having a flow velocity equal to or higher than the rising speed of the ozone fine bubbles is formed.

  According to this configuration, due to the action of the downward flow formed in the contaminated water, the ozone fine bubbles supplied to the contaminated water continue to stay in the contaminated water without rising in the contaminated water, and are almost completely dissolved in the contaminated water. To do. As a result, the reaction efficiency between the contaminated water and ozone is sufficiently improved.

  Further, the present invention provides an ozone reactor for reacting contaminated water containing organic matter and ozone fine bubbles, a supply pipe connected to the upper side of the ozone reactor and supplying the contaminated water to the ozone reactor, A discharge pipe connected to the lower side of the ozone reactor and discharging the contaminated water after reaction from the ozone reactor, an ozone generator, a fine bubble generator for generating fine bubbles having a diameter of 50 μm or less, and the ozone An ozone supply means for connecting the generator and the fine bubble generator and supplying ozone generated by the ozone generator to the fine bubble generator; and the supply pipe and the fine bubble generator are connected to each other in the supply pipe. Ozone microbubbles generated by the microbubble generator by connecting the introduction pipe for introducing a part of the contaminated water flowing through the microbubble generator to the upper side of the ozone generator and the microbubble generator The A discharge pipe for supplying a part of the contaminated water to the ozone reactor, and a total inflow amount of the contaminated water flowing into the ozone reactor through the supply pipe and the discharge pipe, and the discharge Adjusting the outflow amount of the contaminated water flowing out from the ozone reactor through a pipe, and causing the contaminated water in the ozone reactor to have a downward flow having a flow velocity equal to or higher than the rising speed of the ozone fine bubbles. It is characterized by forming.

  Further, the present invention provides an ozone reactor for reacting contaminated water containing organic matter and ozone fine bubbles, a supply pipe connected to the upper side of the ozone reactor and supplying the contaminated water to the ozone reactor, A discharge pipe connected to the lower side of the ozone reactor and discharging the contaminated water after reaction from the ozone reactor, an ozone generator, a fine bubble generator for generating fine bubbles having a diameter of 50 μm or less, and the ozone An ozone supply means for connecting the generator and the fine bubble generator to supply ozone generated by the ozone generator to the fine bubble generator, and connecting the lower side of the ozone reactor and the fine bubble generator The microbubble generator is configured by connecting an introduction pipe for recovering a part of the contaminated water from the ozone reactor and introducing it into the microbubble generator, and the microbubble generator and the upper side of the ozone reactor. Generated by A discharge pipe for supplying a part of the contaminated water containing the ozone fine bubbles to the ozone reactor, and the contaminated water flowing into the ozone reactor through the supply pipe and the discharge pipe Adjusting the total inflow amount and the total outflow amount of the contaminated water flowing out from the ozone reactor through the discharge pipe and the introduction pipe, the ozone fine particles are added to the contaminated water in the ozone reactor. It is characterized by forming a downward flow having a flow velocity equal to or higher than the rising speed of the bubbles.

  Furthermore, in the apparatus for treating contaminated water using ozone fine bubbles according to the present invention, the ozone reactor is preferably constituted by piping.

  Furthermore, in the apparatus for treating contaminated water using ozone fine bubbles according to the present invention, it is preferable that the ozone reactor includes a stirring fan that is automatically rotated by the action of the downward flow.

  Furthermore, it is preferable that the apparatus for treating contaminated water using ozone fine bubbles of the present invention further includes an ultrasonic generator for applying ultrasonic waves to the contaminated water in the ozone reactor.

  ADVANTAGE OF THE INVENTION According to this invention, the reaction efficiency of contaminated water and ozone can fully be improved in the processing method of the contaminated water by ozone fine bubbles, and the processing apparatus of the contaminated water by ozone fine bubbles.

  Embodiments of a contaminated water treatment apparatus (hereinafter simply referred to as “contaminated water treatment apparatus”) according to the present invention will be described below with reference to the accompanying drawings.

=== First Embodiment ===
FIG. 1A is a schematic configuration diagram showing a contaminated water treatment apparatus 100 according to the first embodiment of the present invention. The contaminated water treatment apparatus 100 shown in FIG. 1A includes an ozone reaction tank 1, a supply pipe 2, a discharge pipe 3, an ozone generator 4, a fine bubble generator 5, an ozone generator 4 and a fine bubble generator. 5, an ozone supply means 6 that connects 5, an introduction pipe 7 that connects the supply pipe 2 and the fine bubble generator 5, and a lead-out pipe 8 that connects the fine bubble generator 5 and the upper side of the ozone reaction tank 1. It is equipped with.

  The contaminated water treatment apparatus 100 includes a total amount of contaminated water flowing into the ozone reaction tank 1 through the supply pipe 2 and the outlet pipe 8 and contaminated water flowing out of the ozone reactor 1 through the discharge pipe 3. The amount of outflow is adjusted to form a downward flow in the contaminated water in the ozone reaction tank 1 having a flow velocity equal to or higher than the rising speed of the ozone fine bubbles. More specifically, the flow velocity of the downward flow is determined according to the diameter of the ozone microbubbles based on Stokes' law, for example, when the bubble diameter of the ozone microbubbles is a maximum value of 50 μm, Since the velocity is about 1 mm / second, the flow velocity of the downward flow is set to 1 mm / second or more.

  The ozone reaction tank 1 is a reaction tank for reacting contaminated water containing organic substances with ozone fine bubbles, and a stirring fan 11 is provided in the reaction tank 1. The stirring fan 11 is automatically rotated by a downward flow formed in the contaminated water. The height and cross-sectional area of the ozone reaction tank 1 are determined so that the downward flow formed in the contaminated water is faster than the rising speed of the bubbles, and the residence time necessary for the treatment of the organic matter contained in the contaminated water is satisfied. To do. The ozone fine bubbles are those in which ozone is contained in fine bubbles having a diameter of 50 μm or less, are generated by the ozone generator 4, the fine bubble generator 5, and the ozone supply means 6, and are supplied into the contaminated water. The supply pipe 2 is connected to the upper side of the ozone reaction tank 1 and supplies contaminated water to the ozone reaction tank 1. The discharge pipe 3 is connected to the lower side of the ozone reaction tank 1 and discharges the contaminated water after the reaction from the ozone reaction tank 1.

The ozone generator 4 is not particularly limited as long as it generates ozone gas. The fine bubble generator 5 generates fine bubbles having a diameter of 50 μm or less (the number of bubbles: 6000 / cm ³ or more). For example, the gas is pressurized to supersaturate the liquid, and this gas-liquid mixing is performed. There is a type that generates a fine bubble by suddenly depressurizing the flow at the orifice of the discharge port (see Japanese Patent No. 3620797). The ozone supply means 6 supplies ozone generated by the ozone generator 4 to the fine bubble generator 5. The introduction pipe 7 introduces a part of the contaminated water flowing in the supply pipe 2 into the fine bubble generator 5. The lead-out pipe 8 supplies a part of the contaminated water containing the ozone fine bubbles generated by the fine bubble generator 5 to the ozone reaction tank 1.

  By the way, the contaminated water treatment apparatus 100 is connected to the membrane treatment apparatus 101 and the coagulation sedimentation treatment apparatus 102 in order from the upstream side via the supply pipe 2, and passes through the membrane treatment apparatus 101 and the coagulation precipitation treatment apparatus 102. The raw water is further processed by the contaminated water processing apparatus 100. Examples of such raw water include livestock wastewater, waste disposal site leachate, and wastewater from biomass. These raw waters contain a large amount of organic substances such as humic acid, have high COD and BOD, and high SS and chromaticity. The membrane treatment apparatus 101 is an apparatus for performing membrane treatment on raw water to remove suspended matters and the like. On the other hand, the coagulation sedimentation treatment apparatus 102 is an apparatus for removing impurities and the like by subjecting the raw water passed through the membrane treatment apparatus 101 to coagulation sedimentation treatment.

  In the raw water (hereinafter also referred to as “contaminated water”) that has passed through the membrane treatment apparatus 101 and the coagulation sedimentation treatment apparatus 102, a part of the organic matter is also removed when the suspended matter or impurities are removed. Organic matter still remains, COD and BOD are high, SS and chromaticity are also high. The contaminated water treatment apparatus 100 is an apparatus for sufficiently treating organic substances contained in the contaminated water to reduce COD and BOD, and further reduce SS, chromaticity, and the like.

According to the above configuration, the contaminated water in the ozone reaction tank 1 is formed with a downward flow having a flow velocity higher than the rising speed of the ozone microbubbles, and is supplied to the contaminated water by the action of the downward flow. The ozone fine bubbles continue to stay in the contaminated water without rising in the contaminated water, and are almost completely dissolved in the contaminated water. Thereby, the reaction efficiency of contaminated water and ozone is sufficiently improved. In addition, the stirring fan 11 automatically starts to rotate by the action of the downward flow, whereby the ozone fine bubbles and the contaminated water are sufficiently stirred. As a result, the ozone fine bubbles are easily dissolved in the contaminated water, and the reaction efficiency between the contaminated water and ozone is further improved. Therefore, even when the chromaticity of the contaminated water is set to a predetermined reference value or less, a small amount of ozone is sufficient. For example, about 400 to 700 g of ozone per 1 m ^{3 of} the contaminated water is sufficient. Therefore, the equipment cost and running cost for manufacturing ozone become low. Further, the exhaust gas staying in the upper layer of the ozone reaction tank 1 contains almost no ozone, and no equipment for treating ozone in the exhaust gas is required, so that the cost can be further reduced.

  Although not shown in FIG. 1A, the contaminated water treatment apparatus 100 preferably includes an ultrasonic generator that applies ultrasonic waves to the contaminated water in the ozone reaction tank 1. In such a case, the fine ozone bubbles are easily dissolved in the contaminated water by the action of ultrasonic waves, and the reaction efficiency between the contaminated water and ozone is further improved.

<Confirmation test>
Next, in order to confirm the effect of the present invention, the chromaticity and COD transition of the treated water in the contaminated water treatment apparatus 100 shown in FIG. 1A were measured. Moreover, the oxygen saturation of the treated water at the time of performing an ultrasonic treatment was also measured. The measurement results are shown in FIGS. 1B to 1D, respectively. In this confirmation test, the amount of contaminated water flowing into the ozone reaction tank is 2 L / min, and the ozone reaction tank is φ10 cm, so the downflow speed is 0.43 cm / sec. On the other hand, from the Stokes' law, the floating speed of 50 μm ozone fine bubbles is 0.14 cm / sec. Therefore, the speed of the downward flow has a flow velocity higher than the rising speed of the ozone fine bubbles.

As shown in FIG. 1B, the chromaticity of the treated water tended to show a lower value as the amount of ozone per unit water amount increased, although some errors occurred. When ozone fine bubbles are supplied to the contaminated water, the results suggesting that the amount of ozone injection required to bring the chromaticity below the reference value is sufficient compared to when ozone is supplied by aeration. Indicated. Incidentally, the ozone concentration ^{21g / m 3, 42g / m} 3, contaminated water 3.5 L, were tested for each case of 7.5 L. For example, the amount of ozone injection required to reduce the chromaticity to about 500 or less was about 1300 g / m ³ when ozone was supplied by aeration, but when ozone fine bubbles were supplied to contaminated water. Was about 450 g / m ³ .

As shown in FIG. 1C, the COD (mg / L) of treated water was significantly lower when ozone fine bubbles were supplied to contaminated water than when ozone was supplied by normal aeration. In the confirmation test shown in the figure, the ozone concentration was 42 g / m ³ and the contaminated water was 3.5 L.

  As shown in FIG. 1D, the oxygen saturation (%) of the treated water showed a value exceeding 100% when the contaminated water was subjected to ultrasonic treatment, and was in a supersaturated state. In particular, when ultrasonic treatment was used in combination with supplying fine bubbles, the state of supersaturation was further increased as compared with the case where ultrasonic treatment was used in combination with normal aeration processing. In the figure, the saturation of oxygen, not ozone, is measured, but the same effect can be expected in the case of ozone, that is, the effect of promoting the dissolution of ozone by using ultrasonic treatment together.

  By the way, although it is not clear in each of the above drawings, the chromaticity is predetermined when the downflow having a flow velocity higher than the rising speed of the ozone fine bubbles is formed in the contaminated water, compared to the case where the downflow is not formed. The results showed that a small amount of ozone was required to make the amount less than the standard value.

  From the above results, as in the present invention, when the downflow having a flow velocity higher than the rising speed of the ozone fine bubbles is formed in the contaminated water, the contaminated water and ozone are compared with the case where the downflow is not formed. It is estimated that the reaction efficiency is sufficiently improved.

  Moreover, it is estimated that the combined use of ultrasonic treatment accelerates the dissolution of ozone and further improves the reaction efficiency between contaminated water and ozone.

=== Second Embodiment ===
FIG. 2 is a schematic configuration diagram showing a contaminated water treatment apparatus 200 according to the second embodiment of the present invention. However, in the same figure, the same reference numerals are given to the same portions as those in the first embodiment shown in FIG. 1A, and only the improved portions and the newly added portions are attached with new reference numerals. The explanation will focus on the main part.

  A contaminated water treatment apparatus 200 shown in FIG. 2 has substantially the same configuration as that of the first embodiment shown in FIG. 1A, and includes an ozone reaction tank 1, a supply pipe 2, a discharge pipe 3, and an ozone generator 4. A fine bubble generator 5, an ozone supply means 6, an introduction pipe 70, and a lead-out pipe 80. However, in the contaminated water treatment apparatus 200 according to the present embodiment, unlike the first embodiment shown in FIG. 1A, the introduction pipe 70 connects the lower side of the ozone reaction tank 1 and the fine bubble generator 5 to the ozone. A part of the contaminated water is collected from the reaction tank 1 and introduced into the fine bubble generator 5. In addition, the outlet pipe 80 connects the fine bubble generator 5 and the upper side of the ozone reaction tank 1, and part of the contaminated water containing the ozone fine bubbles generated by the fine bubble generator 5 is supplied to the ozone reaction tank 1. Supply.

  The contaminated water treatment apparatus 200 has a total inflow amount of contaminated water flowing into the ozone reaction tank 1 through the supply pipe 2 and the outlet pipe 80, and flows out of the ozone reaction tank 1 through the discharge pipe 3 and the introduction pipe 70. The total outflow amount of the contaminated water is adjusted to form a downward flow having a flow rate higher than the rising speed of the ozone fine bubbles in the contaminated water in the ozone reaction tank 1.

  According to the above configuration, the contaminated water circulates in the ozone reaction tank 1, and it becomes easy to form a downward flow having a large flow velocity in the contaminated water in the ozone reaction tank 1. As a result, it becomes easy to form a downward flow in the contaminated water in the ozone reaction tank 1 having a flow velocity equal to or higher than the rising speed of the ozone fine bubbles. In addition, since the contaminated water circulates in the ozone reaction tank 1, the reaction between the contaminated water and ozone is continuously repeated in the ozone reaction tank 1, and the reaction efficiency between the contaminated water and ozone is further improved. . Furthermore, since the fine bubble generator 5 circulates the contaminated water into the ozone reaction tank 1 through the introduction pipe 70 and the outlet pipe 80, it has the same function as a circulation pump. Therefore, in the contaminated water treatment apparatus 200 of the present embodiment, it is not necessary to separately provide a circulation pump, which contributes to cost reduction.

=== Third embodiment ===
FIG. 3 is a schematic configuration diagram showing a contaminated water treatment apparatus 300 according to the third embodiment of the present invention. However, in the same figure, the same reference numerals are given to the same portions as those in the first embodiment shown in FIG. 1A, and only the improved portions and the newly added portions are attached with new reference numerals. The explanation will focus on the main part.

  A contaminated water treatment apparatus 300 shown in FIG. 3 has substantially the same configuration as the contaminated water treatment apparatus 100 shown in FIG. 1A, and includes a pipe 10 that is an ozone reactor, a supply pipe 2, a discharge pipe 3, and the like. , An ozone generator 4, a fine bubble generator 5, an ozone supply means 6, an introduction pipe 7, and a lead-out pipe 8. However, in the contaminated water treatment apparatus 300 according to this embodiment, unlike the first embodiment shown in FIG. 1A, the ozone reactor is not a reaction tank (for example, see the ozone reaction tank 1 in FIG. 1A), but meanders up and down. It is comprised by the piping 10 to do.

  According to the above configuration, the contaminated water flows in the pipe 10 at a flow velocity higher than the rising speed of the ozone fine bubbles, and the chance of contact between the contaminated water and ozone is remarkably increased. Therefore, in the contaminated water treatment apparatus 300 of the present embodiment, the reaction efficiency between the contaminated water and ozone is further improved. In addition, since the ozone reactor is constituted by the pipe 10 instead of the reaction tank, it is possible to reduce the space and contribute to cost reduction.

It is a schematic block diagram which shows the processing apparatus of the contaminated water in 1st embodiment of this invention. It is a graph which shows the chromaticity measurement result of treated water. It is a graph which shows the COD measurement result of treated water. It is a graph which shows the oxygen saturation measurement result of the treated water at the time of using ultrasonic treatment together. It is a schematic block diagram which shows the processing apparatus of the contaminated water in 2nd embodiment of this invention. It is a schematic block diagram which shows the processing apparatus of the contaminated water in 3rd embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ozone reaction tank 2 Supply pipe 3 Discharge pipe 4 Ozone generator 5 Fine bubble generator 6 Ozone supply means 7,70 Introducing pipe 8,80 Outlet pipe 10 Piping 100,200,300 Contaminated water treatment apparatus

Claims (6)

A method for treating contaminated water with ozone fine bubbles, wherein the organic matter is treated by reacting contaminated water containing organic matter with ozone fine bubbles,
A method for treating contaminated water using ozone fine bubbles, wherein a downward flow having a flow velocity equal to or higher than the rising speed of the ozone fine bubbles is formed in the contaminated water. An ozone reactor for reacting contaminated water containing organic matter with ozone fine bubbles;
A supply pipe connected to the upper side of the ozone reactor for supplying the contaminated water to the ozone reactor;
A discharge pipe connected to the lower side of the ozone reactor and discharging the contaminated water after reaction from the ozone reactor;
An ozone generator;
A fine bubble generator for generating fine bubbles having a diameter of 50 μm or less;
Ozone supply means for connecting the ozone generator and the fine bubble generator to supply the ozone generated by the ozone generator to the fine bubble generator;
An introduction pipe for connecting the supply pipe and the fine bubble generator and introducing a part of the contaminated water flowing in the supply pipe into the fine bubble generator;
A lead-out pipe that connects the fine bubble generator and the upper side of the ozone reactor to supply a part of the contaminated water containing the ozone fine bubbles generated by the fine bubble generator to the ozone reactor; With
Adjusting a total inflow amount of the contaminated water flowing into the ozone reactor through the supply pipe and the outlet pipe, and an outflow amount of the contaminated water flowing out of the ozone reactor through the discharge pipe. An apparatus for treating contaminated water using ozone fine bubbles, wherein a downflow having a flow velocity equal to or higher than the rising speed of the ozone fine bubbles is formed in the contaminated water in the ozone reactor. An ozone reactor for reacting contaminated water containing organic matter with ozone fine bubbles;
A supply pipe connected to the upper side of the ozone reactor for supplying the contaminated water to the ozone reactor;
A discharge pipe connected to the lower side of the ozone reactor and discharging the contaminated water after reaction from the ozone reactor;
An ozone generator;
A fine bubble generator for generating fine bubbles having a diameter of 50 μm or less;
Ozone supply means for connecting the ozone generator and the fine bubble generator to supply the ozone generated by the ozone generator to the fine bubble generator;
An inlet pipe for connecting the lower side of the ozone reactor and the fine bubble generator to collect a part of the contaminated water from the ozone reactor and introducing it into the fine bubble generator;
A lead-out pipe that connects the fine bubble generator and the upper side of the ozone reactor to supply a part of the contaminated water containing the ozone fine bubbles generated by the fine bubble generator to the ozone reactor; With
The total inflow of the contaminated water flowing into the ozone reactor through the supply pipe and the outlet pipe, and the total outflow of the contaminated water flowing out of the ozone reactor through the discharge pipe and the introduction pipe And forming a downward flow having a flow rate equal to or higher than the rising speed of the ozone fine bubbles in the contaminated water in the ozone reactor. In the processing apparatus of the contaminated water by the ozone fine bubble of Claim 2 or 3,
The said ozone reactor is comprised with piping, The processing apparatus of the contaminated water by the ozone fine bubble characterized by the above-mentioned. In the processing apparatus of the contaminated water by the ozone fine bubble in any one of Claim 2 to 4,
The ozone reactor is provided with a stirring fan that is automatically rotated by the action of the downward flow, and the apparatus for treating contaminated water by ozone fine bubbles. In the processing apparatus of the contaminated water by the ozone fine bubble in any one of Claim 2 to 5,
An apparatus for treating contaminated water using fine ozone bubbles, comprising an ultrasonic generator for applying ultrasonic waves to the contaminated water in the ozone reactor.