JP5099612B2 - Liquid processing equipment - Google Patents

Description

  The present invention efficiently converts organic substances, inorganic substances, microorganisms, bacteria, viruses, etc. in the liquid by microbubbleing the activated gas obtained by generating gas discharge in various raw material gases and diffusing it in the liquid. The present invention relates to a liquid processing apparatus intended to be well decomposed.

  Ozone is widely used to perform liquid treatments such as oxidative decomposition, sterilization, sterilization, and deodorization of organic substances in liquids such as clean water, sewage, and industrial wastewater. At this time, in order to increase the contact area between ozone and the liquid to be processed and to improve the processing efficiency, a method of soaking the ozone-containing gas obtained from the ozone generator into microbubbles and diffusing it into the liquid to be processed, so-called microbubbles are used. A water treatment device has been proposed. “Microbubbles” are also called “microbubbles” or “microbubbles”, and the definition of the size of the bubbles is not clearly established, but at the time of their occurrence, they generally refer to bubbles having a diameter of 1 μm to 100 μm, Since it has physical properties different from those of normal bubbles in centimeters, it is common technical knowledge for those skilled in the art to distinguish them from these. In other words, normal bubbles rapidly rise in the liquid and burst at the liquid level, whereas microbubbles, especially bubbles having a diameter of 50 μm or less, have a small volume, so the rising speed is slow and they remain in the liquid for a long time. Since the pressure due to the interfacial tension at the interface between the liquid phase and the gas phase (self-pressurization effect) is inversely proportional to the size of the bubble, the gas dissolves in the liquid compared to the normal bubble. It is known that it has the property of being promoted and is suitable for the liquid treatment. Bubbles having a diameter of 1 μm or less are formed by contraction of the generated microbubbles in the liquid, and although the establishment of measurement methods and elucidation of characteristics are still in progress, those skilled in the art use the term “nanobubble” as “microbubbles”. It is also common technical knowledge to be classified as

For example, in Patent Document 1, water treatment is performed by connecting an ozone generator and a microbubble generator with a gas supply pipe or the like. However, ozone itself has a weak oxidizing power, and in addition, the ozone-containing gas generated by the discharge in the gas containing air or oxygen is converted into microbubbles, deactivation during the movement in the gas supply pipe, gas supply There is a problem that the water treatment efficiency is extremely lowered due to a decrease in ozone density due to adsorption inside a pipe or the like.

  Therefore, atomic oxygen radicals (O radicals) and hydroxyl radicals (OH radicals), which have a stronger oxidizing action than ozone, are directly generated in the water to be treated to realize oxidative decomposition, sterilization, sterilization, deodorization, etc. of organic substances. In addition, a method has been proposed in which a high-voltage electrode is installed in a liquid to be treated and a high-frequency or pulse voltage is applied to cause an underwater discharge (Patent Document 2). However, since the discharge electrode is immersed in the liquid to be treated, not only a power source capable of applying a voltage exceeding several tens of KV is necessary to cause discharge, but also for stable generation and maintenance of underwater discharge. Optimization of the control circuit is essential. For this reason, the underwater discharge method has a problem of high economic and technical difficulties.

  On the other hand, a water treatment device has also been proposed in which water to be treated is made into water droplets by means of water droplets and supplied to a streamer discharge field, whereby ozone, O radicals, and OH radicals generated by streamer discharge decompose the target substance in the water droplets. (Patent Document 3). In this case, since the water to be treated is supplied in the form of water droplets to the discharge field, a discharge can be generated even with a small applied voltage, which is more economical than the case where the discharge electrode is immersed in the water to be treated. . Also. Since this water treatment device also has means for supplying the gas in the streamer discharge field into a bubble state in the previous process and supplying it to the water to be treated, it is possible to reuse the ozone remaining in the gas that has not been used. I am trying.

  However, ozone, O radicals, and OH radicals generated in streamer discharges react with the water to be treated at the gas-liquid interface, so that it is necessary to supply water with fine droplets in order to increase the surface area where the reaction occurs. Even if the water droplets are miniaturized, ozone and various radicals cannot be sufficiently reacted with the water droplets unless the capacity or size of the streamer discharge field is set sufficiently large and the time during which the water droplets stay in the streamer discharge field is lengthened.

In order to make up for such drawbacks, a method has been adopted in which residual ozone in the streamer discharge field is microbubbled and supplied to the water to be treated in the previous process, but this is accompanied by deactivation in the supply path of ozone and various radicals. The problem of reduced processing capacity has not been solved.
JP 2010-69387 A Japanese Patent Laid-Open No. 2005-58995 JP 2010-194527 A

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a liquid processing apparatus having a small and simple structure capable of processing a liquid to be processed efficiently and at low cost.

In order to achieve the above object, a liquid processing apparatus according to claim 1 includes a gas discharge unit having a voltage application electrode and a ground electrode, and generation of a swirl-type gas-liquid shearing type microbubble directly connected integrally therewith. The gas discharge unit generates an activated gas by converting the gas into plasma by gas discharge between the electrodes under atmospheric pressure, and the microbubble generation unit is introduced from the gas discharge unit. The activated gas is microbubbled into bubbles having a diameter of 1 to 100 μm in the liquid to be processed to generate a gas-liquid mixed fluid, and the gas-liquid mixed fluid is supplied to the liquid to be processed again. To do.

Here, the configuration of the voltage application electrode and the installation electrode is not particularly limited. For example, a metal pipe represented by an injection needle may be used as the voltage application electrode, and a metal plate may be used as the ground electrode. In this case, any one of corona discharge, spark discharge, and streamer discharge is generated between the voltage application electrode and the ground electrode.

Furthermore, you may comprise as a voltage application electrode with a metal needle, a metal thin rod, a metal wire, or those aggregates. Alternatively, the surface of one or both of the voltage application electrode and the ground electrode may be covered with a dielectric, and in this case, a dielectric barrier discharge can be generated to diffuse the discharge region. Furthermore, the gas discharge section may have an electrode structure that generates various discharges such as creeping discharge and hollow discharge under atmospheric pressure.

  In addition, the voltage waveform of the current supplied to the voltage application electrode includes a sinusoidal waveform such as an alternating current (AC) wave of several tens of Hz to several hundred kHz, a radio (RF) wave of several MHz to several hundred MHz, a pulse waveform, Examples include impulse waveforms.

On the other hand, the gas is any gas such as oxygen, nitrogen, argon, helium, or a mixture thereof, including air. The gas discharge is any one of various discharges in gas such as corona discharge, spark discharge, streamer discharge, dielectric barrier discharge, creeping discharge, hollow discharge, and the like.

Here, in the corona discharge, when a voltage is applied between the needle-like electrode provided in the atmosphere and the electrode on the flat plate, the air at the tip of the needle-like electrode causes dielectric breakdown, and weak light is emitted at the tip of the needle. This is a discharge. The required applied voltage is relatively high and needs to be several kV or more, but it is applied to a static eliminator (ionizer) or the like.

When the voltage of the corona discharge is further increased, the air between the needle-like electrode and the plate-like electrode causes a wide breakdown and forms a discharge path, which is a spark discharge.

On the other hand, when the acicular electrode is a cathode, high-density positive ions remain after the “electron avalanche” emitted from the cathode, and these positive ions further form an “electron avalanche”. A streamer discharge is formed in which a plasma-like discharge path is formed between the electrodes.

In dielectric barrier discharge, the surface of a metal electrode is covered with a dielectric such as glass or ceramics, so that electrons generated by the discharge accumulate on the dielectric surface, and the electrons accumulated when the polarity of the applied electric field is reversed. Is accelerated by the counter electrode side to maintain the ionization / discharge, and is used for an ozone generator or the like. Compared with discharge using electrodes that do not use a dielectric, the density of radicals such as ozone is high, but the gas temperature is low, and this discharge is generally used as an atmospheric pressure plasma generating means.

The creeping discharge is a corona discharge that progresses to the counter electrode through the surface of a dielectric or the like, and a discharge path is formed on the surface of the dielectric.

The hollow discharge is a discharge in a hollow (hole or hollow shape) cathode. Since it has a large electron energy and realizes a high ionization and high excitation state, it is used for an ultraviolet light source or the like.

On the other hand, the activated gas is any one of various plasmas generated by gas discharge depending on the kind of gas, various radicals (including ions) having an oxidizing or reducing action, ozone, or a combination thereof (hereinafter “plasma”). Etc.))).

Furthermore, the term “plasmaization” refers to generating the plasma or the like by ionizing a part of the molecules of the gas by causing the gas discharge in the gas.

Further, the swirl type gas-liquid shearing type microbubble generating part generates a vortex in the liquid, forms a negative pressure cavity on the axis of the vortex by the introduced gas, The gas is forcibly and continuously cut and pulverized by the difference in swirling speed with the liquid at the tip to form microbubbles. If the swirl type gas-liquid shearing microbubble generator is directly connected to the gas discharge part, the activity generated under atmospheric pressure in the gas discharge part due to the negative pressure effect of the negative pressure cavity part. Since the activated gas is immediately self-absorbed, it can be introduced without pressurizing and forcibly sending the activated gas, and it can be introduced while keeping the generated activated gas in contact with the solid surface as much as possible. The microbubbles containing a large amount of the activated gas can be stably generated with a relatively simple and small-scale structure.

  Next, the liquid processing apparatus according to claim 2 is the liquid processing apparatus according to claim 1, wherein the gas discharge unit introduces a specific gas or a mixed gas formed by mixing a plurality of types of gases. It is characterized by comprising a gas supply means.

  Since the plasma contained in the activated gas generated in the gas discharge unit differs depending on the type of gas to be introduced, the gas discharge unit can change the gas to be introduced by providing the gas supply means, and the desired An activated gas containing plasma or the like can be generated.

The liquid processing apparatus according to claim 3 has a structure in which the gas discharge part and the microbubble generating part are detachable.

  The liquid processing apparatus according to the present invention comprises a gas-liquid mixed fluid generated by microbubbles an activated gas containing plasma or the like obtained by converting gas into plasma by gas discharge under atmospheric pressure in the liquid to be processed. It is supplied again into the liquid to be treated. Since the activated gas contained in the gas-liquid mixed fluid is made into microbubbles, liquid processing by reaction of plasma or the like with liquid molecules at the gas-liquid interface between the microbubbles and the liquid to be processed supplied thereto. To realize.

At this time, (1) the reaction area at the gas-liquid interface increases because the surface area / volume ratio of the microbubbles is larger than that of normal fine bubbles, (2) the residence time of the microbubbles in the liquid to be treated, That is, the reaction time at the gas-liquid interface is long, and (3) the reaction is enhanced by forcibly dissolving the activated gas in the liquid to be treated by the self-pressurization effect of the microbubbles. As a result, the reaction efficiency between the plasma and the liquid to be processed is significantly increased as compared with the case where the activated gas is directly discharged into the liquid to be processed as normal bubbles, and before the plasma or the like having a short lifetime is deactivated. Therefore, the liquid to be treated can be processed efficiently and at low cost. In particular, when an activated gas containing O radicals that generate hydrogen peroxide (H2O2), which has strong oxidizing power by reacting with water, is supplied into the liquid to be treated, the substance to be treated is oxidized and decomposed particularly efficiently. Can do.

In addition, when the activated gas is released directly into the liquid to be treated as bubbles, the initial velocity of the bubbles is small in the first place, and the light and small inertia bubbles are immediately decelerated after being released due to frictional resistance with the liquid to be treated. Therefore, the activated gas is difficult to diffuse over a wide range from the discharge point. Therefore, when the amount of the liquid to be processed is large, it may be necessary to separately stir and circulate the liquid to be processed in order to increase the liquid processing efficiency.

On the other hand, since the liquid processing apparatus according to the present invention ejects the activated gas as a gas-liquid mixed fluid with the liquid to be processed, the jetted gas-liquid mixed fluid is a pump of the pump that pumps the liquid to be processed to the microbubble generating unit. It has a relatively large initial speed and directivity according to the output. In addition, the gas-liquid mixed fluid that is heavier than mere bubbles and has a large inertia proceeds further in the liquid to be processed, and stirs and circulates the liquid to be processed. For this reason, the microbubbles of the activated gas contained therein are also diffused over a wider range, so that the effect of increasing the efficiency of the liquid treatment is also achieved.

  Moreover, since the liquid processing apparatus according to the present invention generates activated gas by gas discharge, it does not require a high voltage required for underwater discharge and can be realized at a relatively low cost.

  In addition, since the gas discharge unit and the microbubble generation unit are integrally connected directly, a pipe or a hose for introducing the activation gas into the microbubble generation unit is not required, and the plasma has a short life. The activated gas can be made into microbubbles before the liquid is deactivated, and the liquid to be treated can be processed efficiently.

  In addition, by changing the structure and shape of the voltage application electrode and the ground electrode of the gas discharge part, there are various corona discharge, spark discharge, streamer discharge, dielectric barrier discharge, creeping discharge, hollow discharge, etc. between the two electrodes. Therefore, it is possible to control the energy of the generated plasma and the like, and it is possible to perform processing according to the conditions of the liquid to be processed.

  Moreover, since the said gas discharge part is provided with the gas supply means which introduces the mixed gas formed by mixing a specific gas or multiple types of gas, the kind and mixing ratio of the gas to supply can be changed. Therefore, not only ozone, O radical, OH radical, etc., but also activated gas containing relatively long-lived metastable excited argon radical, helium radical, nitrogen radical, etc., is microbubbled into the liquid to be treated. In addition to efficiently generating OH radicals by dissociating water molecules in the liquid at the gas-liquid interface of the microbubbles, it promotes the decomposition and chemical reaction of various chemical substances dissolved in the liquid. be able to.

  In addition, since the microbubble generator supplies the activated gas as microbubbles having a diameter of 1 to 100 μm into the liquid, the surface area of the gas-liquid interface where the plasma or the like comes into contact with the liquid to be treated may be significantly increased. In addition, since microbubbles float in the liquid to be treated for a long time compared to normal bubbles due to their nature, the reaction time of plasma and other substances to be treated can be kept longer, further improving the efficiency of treatment. Can do.

Furthermore, since the gas discharge part and the microbubble generator have a detachable structure, the type of the gas discharge part can be arbitrarily replaced according to the use and use conditions of the liquid processing apparatus, so that the liquid processing It is economical because the applicable range of the apparatus can be expanded, and when either the gas discharge part or the microbubble generation part fails, only that part needs to be replaced.

Hereinafter, an embodiment of a liquid processing apparatus according to the present invention will be described in detail with reference to FIGS. 1 to 8. Since the following embodiments differ only in the configuration of the liquid processing apparatus main body, FIGS. 2 to 7 show only the liquid processing apparatus main body, and all the configurations of the present invention other than the liquid processing apparatus main body are shown in FIG. And in common.

(First embodiment)
FIG. 1 is a diagram showing a first embodiment of a liquid processing apparatus according to the present invention, and shows a liquid processing apparatus A to which the present invention is applied and its operating state.

As shown in FIG. 1, the liquid processing apparatus main body A is formed by directly connecting the gas discharge unit 1 and the microbubble generation unit 2 integrally, and is immersed in the liquid to be processed W filling the liquid tank T. Yes. The gas discharge part 1 is connected by a gas supply part 3 for supplying a gas GS and a gas supply pipe 7, while the microbubble generation part 2 is also connected by a circulation pump 5 and a liquid supply pipe 8 which are also immersed in the liquid. It is connected.

The gas discharge part 1 is formed of an insulating material such as acrylic resin, for example, and is provided with a gas inlet 10 and a gas outlet 11, and a gas supply pipe 7 is connected to the gas inlet 10.

Inside the gas discharge part 1, a voltage application electrode 12 made of a metal tube is attached to the gas introduction port 10, and the gas GS supplied from the gas supply tube 7 passes through the inside of the voltage application electrode 12 from its tip. It is configured to be introduced into the gas discharge unit 1. A ground electrode 13 made of a metal plate such as a copper plate is supported perpendicularly to the axis of the voltage application electrode 12 at an appropriate interval. As the voltage application electrode 12, for example, an injection needle-like metal tube having an outer diameter of 0.7 mm and an inner diameter of 0.5 mm or less is suitable.

The voltage application electrode 12 and the ground electrode 13 are connected to the high-voltage power supply 4 by a feeder 9, respectively, and when a pulse voltage, an AC voltage, or a radio wave voltage is applied from the high-voltage power supply 4, the voltage application electrode 12 and the ground electrode 13 correspond to the applied voltage. Any one of corona discharge, spark discharge, and streamer discharge S is generated between the voltage application electrode 12 and the ground electrode 13.

With this configuration, the gas GS introduced into the gas discharge unit 1 from the tip of the voltage application electrode 12 from the gas supply unit 3 through the gas introduction tube 7 is partially plasma-equalized by the discharge S, and the gas discharge unit The interior of 1 is filled with an activated gas PG containing the plasma or the like.

On the other hand, the microbubble generator 2 employs a swirl type gas-liquid shearing method in the present embodiment. The inner wall of the microbubble generating part 2 is formed in a cylindrical shape, and a self-sucking port 20 directly connected to the gas outlet 11 of the gas discharge part 1 at the center of the connection surface with the gas discharge part 1 and the self-sucking activity A gas-liquid mixed fluid discharge that discharges the gas-liquid mixed fluid MB containing the generated microbubbles into the liquid tank T at the center of the opposite surface. An outlet 22 is provided.

The liquid W to be processed which is pressure-fed and supplied from the circulation pump 5 through the liquid supply pipe 8 forms a vortex R along the inner wall inside the microbubble generator 2. The activated gas PG introduced from the nozzle 21 forms a swirling cavity V having a negative pressure on the swirling axis of the swirl due to the centrifugal separation action by the swirl. Due to the negative pressure, the activated gas PG is continuously supplied to the inside of the microbubble generator 2 and swirls with the liquid W at the microbubble generation point P generated at the tip of the negative pressure cavity V. It is forcibly and continuously cut and pulverized by the speed difference to form microbubbles.

Next, the gas supply unit 3 includes a hollow container having at least four openings in addition to the connection port of the gas supply pipe 7. A pressure regulating valve 30 is provided at the opening connected to the gas supply pipe 7. The amount and pressure of the gas GS supplied to the gas discharge unit 1 can be adjusted. Further, a gas cylinder GB1 storing a gas GS corresponding to a type of plasma or the like desired to be generated in the gas discharge section 1 and a gas cylinder GB2 storing air or nitrogen can be connected to the plurality of openings.

As described above, since the microbubble generating unit 2 self-sucks the activated gas PG due to the negative pressure generated in the microbubble generating unit 2, the supply of the gas GS into the gas discharging unit 1 connected thereto is also a differential pressure from the atmospheric pressure. Achieved automatically. Therefore, it is not necessary to pressurize the gas supply unit 3 in particular, and when the pressure regulating valve 30 is adjusted so that the supply pressure of the gas GS is equal to the atmospheric pressure, the pressure in the gas discharge unit 1 is basically the atmospheric pressure. The state of is maintained.

Here, when the gas GS to be activated gas is air, the atmosphere may be introduced into the gas supply pipe 7 as it is by opening the gas supply unit 3 to the atmosphere and also opening the pressure regulating valve 30. On the other hand, when the gas GS to be activated gas is a gas other than air, such as oxygen, nitrogen, argon, helium, or a mixed gas thereof, from the gas cylinder B1 connected to one of the openings of the gas supply unit 3 The desired gas GS may be introduced, and the other opening may be opened to the atmosphere to replace the inside of the gas supply unit 3 with the desired gas GS.

Furthermore, it is also possible to control the particle size of the microbubbles generated in the microbubble generating unit 2 by adjusting the pressure adjusting valve 30 and adjusting the amount of the gas GS flowing into the gas discharging unit 1. . In the test using the prototype of the present embodiment, it was confirmed that the microbubble particle size was continuously reduced by reducing the opening of the pressure regulating valve 30. The swirling speed of the vortex R generated in the liquid W to be treated inside the microbubble generator 2 is determined by the output of the circulation pump 5 and the length and inner diameter of the hose, etc., but within a unit time when the swirling speed is constant. The smaller the amount of the activated gas PG fed into the microbubble generator 2, the smaller the amount of gas that forms the negative pressure cavity V. Therefore, since the amount of the activated gas PG that is microbubbled at the microbubble generation point P per unit time is also small, the particle size of the microbubbles is considered to be small.

By the way, when the operation of the circulation pump 5 is stopped, the negative pressure inside the microbubble generator 2 disappears, so that the liquid W to be processed flows backward from the nozzle 21 into the gas discharge unit 1. In order to prevent this, the solenoid valves 31 to 34 are provided in openings other than the opening connected to the gas introduction pipe 7 of the gas supply section 3, and the operation of the circulation pump 5 and the opening and closing of these solenoid valves can be controlled in conjunction with each other. A control device 6 is provided. A gas cylinder GB1 storing various gases GS is connected to the solenoid valve 31, a gas cylinder GB2 storing air or nitrogen slightly pressurized from the atmosphere is connected to the solenoid valve 32, and the solenoid valves 33 and 34 are opened to the atmosphere. Mouth.

If the control device 6 stops the operation of the circulation pump 5 and simultaneously closes the solenoid valves 31, 33, and 34 and opens the solenoid valve 32, the gas supply unit 3 and the gas discharge unit with air or nitrogen in the gas cylinder GB2. It can prevent that the to-be-processed liquid W flows backward from the microbubble generation | occurrence | production part 2 because the atmospheric | air pressure in 1 increases. As a result, the liquid processing apparatus can perform liquid processing intermittently.

Next, a liquid processing method for processing the liquid W to be processed by microbubbles the activated gas PG generated from the specific gas GS using the liquid processing apparatus A according to the present embodiment will be described.

First, the electromagnetic valves 31, 33, and 34 are closed in advance and the electromagnetic valve 32 is opened, so that the liquid processing apparatus A and the circulation pump 5 in a state where air or nitrogen is introduced into the gas discharge unit 1 are processed in the liquid tank T. Immerse in liquid W.

Next, when the circulation pump 5 is operated, the eddy current R in which the liquid W to be processed, which is pumped into the microbubble generator 2 through the liquid supply pipe 8, swirls at high speed is generated. Since a negative pressure swirl cavity V is formed on the swirl axis of the vortex R, air or nitrogen in the gas discharge unit 1 is sucked into the microbubble generator 2 through the nozzle 21 due to the negative pressure effect. Microbubbles are generated and discharged from the gas-liquid mixed fluid discharge port 22 into the liquid W to be processed.

Subsequently, when the solenoid valve 32 is closed and the solenoid valves 31 and 34 are opened at the same time, the supply of air or nitrogen from the gas cylinder GB2 is stopped, and a specific gas GS from the gas cylinder GB1 passes through the gas supply unit 3 instead. It is introduced into the gas discharge part 1 and is sucked into the microbubble generating part 2 as it is to start microbubbles.

When the high-voltage power supply 4 is operated in this state, corona discharge occurs between the voltage application electrode 12 made of an injection needle-like metal tube installed in the gas discharge unit 1 and the ground electrode 13 made of a metal plate. An activated gas PG is generated when a part of the gas GS in the discharge unit 1 is plasma-equalized. Since the activated gas PG is immediately sucked into the microbubble generator 2, is microbubbled in the liquid W to be processed, is released into the liquid tank T, and reacts with the substance to be processed in the liquid W to be processed. is there.

Decolorization in which discharge is performed using the indigo carmine solution dissolved in pure water 32L (liter) at a concentration of 25 mg / L as the liquid W to be processed using the prototype of the liquid processing apparatus according to the first embodiment shown in FIG. A test was performed to verify the effect of the present invention in comparison with the case where the treatment was performed and no discharge was performed. The test conditions are as follows, and FIG. 8 is a graph comparing the measured values of the UV-visible spectrum with and without discharge of the solution 17 days after the start of the treatment.
Circulating flow rate of liquid to be treated: 13 L / min Discharge power: 70 W
Applied voltage: 4-5kV
Pulse interval: 1 ms
Processing time: 2 hours / day

  According to FIG. 8, in the comparative example without a discharge (dotted line), a broad absorption peak having a peak near 600 nm is seen. For this reason, it can be seen that the indigo carmine solution exhibits a blue color (visible light region of 400 to 500 nm remaining without being absorbed). On the other hand, in the example with a discharge (solid line), the absorption in the visible light region is lost, and the solution shows light transmittance. Thus, the effectiveness of the present invention was confirmed from the fact that there was a remarkable decoloring effect in the case with discharge compared to the case without discharge.

(Second Embodiment)
FIG. 2 is a diagram showing a second embodiment of the liquid processing apparatus according to the present invention, and shows the internal structure of a liquid processing apparatus main body B to which the present invention is applied.

The liquid processing apparatus main body B is installed by inserting a voltage applying electrode 40 made of a metal tube installed in the gas discharge unit 1 into a cylindrical dielectric tube 42 made of a dielectric such as glass or ceramics, An annular ground electrode 41 is provided in close contact with the outer surface of the dielectric tube 41 at the tip of the voltage application electrode 40 or at a position slightly away from the tip. One end of the dielectric tube 42 on the side where the voltage application electrode 40 is inserted is supported in a hollow space in the gas discharge unit 1 and the other end is connected to the gas outlet 11. The remaining configuration is the same as that of the liquid processing apparatus main body A.

According to the main body B of the liquid processing apparatus, the discharge between the electrodes is generated inside the dielectric tube 42, and plasma or the like is generated only in the dielectric tube 42. Therefore, the activated gas PG does not diffuse. While containing high concentration plasma or the like, the gas is immediately sucked from the gas outlet 11 to the microbubble generator 2. Therefore, the activation gas PG can be efficiently microbubbled while minimizing the inactivation of various radicals having a short lifetime, and the processing capacity can be improved.

(Third embodiment)
3 and 4 are diagrams showing a third embodiment of the liquid processing apparatus according to the present invention, and showing the internal structure of the liquid processing apparatus main body C and the liquid processing apparatus main body D to which the present invention is applied. It is.

The liquid processing apparatus main body C shown in FIG. 3 is the same as the liquid processing apparatus main body A except that the voltage application electrode 50 installed in the gas discharge unit 1 is configured in a needle shape or a cone shape that is not hollow. is there.

According to the liquid processing apparatus main body C, a discharge S of any one of corona discharge, spark discharge, and streamer discharge is generated between the voltage application electrode 50 and the ground electrode 51. The shape of the voltage application electrode 50 is a simple needle shape. Therefore, the durability is high and the structure can be simplified.

Also, the liquid processing apparatus main body D shown in FIG. 4 is an improved example of the liquid processing apparatus main body C, and the voltage application electrode 60 is configured by integrating a large number of the needle-like or conical voltage application electrodes 50. Therefore, the region where the discharge S is generated can be expanded, and the generation amount of plasma or the like can be increased. Thereby, the processing capability of the liquid W to be processed can be improved.

(Fourth embodiment)
FIG. 5 is a diagram showing a fourth embodiment of a liquid processing apparatus according to the present invention, and shows an internal structure of a liquid processing apparatus main body E to which the present invention is applied.

The main body E of the liquid processing apparatus is the same as the main body A of the liquid processing apparatus except that the voltage applying electrode 70 installed in the gas discharge unit 1 is configured by integrating a plurality of metal tubes.

Gas GS is supplied to any of the metal tubes, and discharge S is generated between the tips of all the metal tubes and the plate-like installation electrodes 71, so that the region where the discharge S is generated can be expanded. Compared with the liquid processing apparatus main body A, it is possible to increase the generation amount of plasma or the like. Thereby, the processing capability of the liquid W to be processed can be improved.

(Fifth embodiment)
6 and 7 are views showing a fifth embodiment of the liquid processing apparatus according to the present invention and showing the internal structure of the liquid processing apparatus main body F and the liquid processing apparatus main body G to which the present invention is applied. It is.

In the liquid processing apparatus main body F, a cylindrical dielectric tube 82 made of a dielectric material such as glass or ceramic having an inner diameter of several mm or less and a thickness of about 1 mm is provided for the gas inlet 10 and the gas outlet 11 of the gas discharge unit 1. The voltage application electrode 80 and the ground electrode 81 made of a metal plate are provided in close contact with each other across the dielectric tube 82 on the outer surface of the dielectric tube 82, and the rest The configuration is the same as that of the liquid processing apparatus main body A.

According to the main body F of the liquid processing apparatus, the discharge between the electrodes is generated inside the dielectric tube 82, and plasma or the like is generated only in the dielectric tube 82. Therefore, the activated gas PG does not diffuse. While containing high concentration plasma or the like, the gas is immediately sucked from the gas outlet 11 to the microbubble generator 2. Therefore, the activation gas PG can be efficiently microbubbled while minimizing the inactivation of various radicals having a short lifetime, and the processing capacity can be improved.

Further, the liquid processing apparatus main body G shown in FIG. 7 is an improved example of the liquid processing apparatus main body F, and the voltage applying electrode 90 and the ground electrode 91 are both metal plates on the entire outer surface of the dielectric tube 82. It is set as the structure wound by the annular | circular shape. In this case, the positional relationship between both electrodes is not particularly limited.

According to this liquid processing apparatus main body G, a high electric field that causes gas discharge is generated between the voltage application electrode 90 and the ground electrode 91, so that electrons are accelerated along the inner wall surface of the dielectric tube 82. In this case, compared to the case where the gap (distance) between the electrodes is short as in the liquid processing apparatus main body F, the electrons are sufficiently accelerated by the electric field, so that the energy obtained by the electrons increases. For this reason, since energy such as generated plasma is high and electrons are traveling a long distance, ionization / excitation processes occur with many atoms / molecules in the gas GS. There is an advantageous effect of increasing compared to the above.

  As mentioned above, although embodiment of the liquid processing apparatus which concerns on this invention was described, this invention is not limited to the said embodiment, In the range of the technical idea of this invention, improvement or a change is possible, They shall belong to the technical scope of the present invention.

The application target of the liquid processing apparatus according to the present invention is not particularly limited, and can be applied to the general decomposition and removal of harmful substances such as organic substances, inorganic substances, microorganisms, bacteria, and viruses in liquids. It is useful for the purification of wastewater containing etc. and the sterilization treatment of contaminated water containing medical waste.

1 is an overall configuration diagram of a liquid processing apparatus according to a first embodiment of the present invention. It is an internal structure figure of the liquid processing apparatus main body B in the liquid processing apparatus which concerns on the 2nd Embodiment of this invention. It is an internal structure figure of the liquid processing apparatus main body C in the liquid processing apparatus which concerns on the 3rd Embodiment of this invention. It is an internal structure figure of the liquid processing apparatus main body D in the modified example of the liquid processing apparatus which concerns on the 3rd Embodiment of this invention. It is an internal structure figure of the liquid processing apparatus main body E in the liquid processing apparatus which concerns on the 4th Embodiment of this invention. It is an internal structure figure of the liquid processing apparatus main body F in the liquid processing apparatus which concerns on the 5th Embodiment of this invention. It is an internal structure figure of the liquid processing apparatus main body G in the modified example of the liquid processing apparatus which concerns on the 5th Embodiment of this invention. It is a graph which shows the measurement result of the decoloring process test done with the liquid processing apparatus which concerns on the 1st Embodiment of this invention.

A to G Liquid processing apparatus main body T Liquid tank W Liquid to be processed GS Gas S Discharge PG Activation gas R Eddy current V Negative pressure cavity P Micro bubble generation point MB Gas-liquid mixed fluid containing micro bubbles GB1 Gas cylinder 1
GB2 Gas cylinder 2
DESCRIPTION OF SYMBOLS 1 Gas discharge part 2 Micro bubble generation part 3 Gas supply part 4 High voltage power supply 5 Circulation pump 6 Control apparatus 7 Gas supply pipe 8 Liquid supply pipe 9 Feed line 10 Gas inlet 11 Gas outlet 12 Voltage application electrode (liquid processing apparatus main body A)
13 Ground electrode (Liquid treatment device body A)
20 Self-priming port 21 Nozzle 22 Gas-liquid mixed fluid discharge port 30 Pressure adjusting valve 31-34 Solenoid valve 40 Voltage application electrode (liquid processing apparatus main body B)
41 Ground electrode (Liquid treatment device body B)
42 Dielectric tube (Liquid treatment device body B)
50 Voltage application electrode (Liquid treatment device body C)
51 Ground electrode (Liquid treatment device body C)
60 Voltage application electrode (liquid processing apparatus main body D)
61 Ground electrode (Liquid treatment device body D)
70 Voltage application electrode (liquid processing equipment body E)
71 Ground electrode (liquid processing equipment body E)
80 Voltage application electrode (liquid processing equipment main body F)
81 Ground electrode (Liquid treatment device body F)
82 Dielectric tube (Liquid treatment equipment body F, G)
90 Voltage application electrode (liquid processing device main body G)
91 Ground electrode (liquid processing equipment body G)

Claims (3)

A gas discharge unit having a voltage application electrode and a ground electrode; and a swirl-type gas-liquid shearing microbubble generation unit directly and integrally connected to the gas discharge unit, wherein the gas discharge unit includes the electrodes under atmospheric pressure. The gas is turned into plasma by gas discharge in between to generate activated gas, and the microbubble generating unit converts the activated gas introduced from the gas discharging unit into bubbles having a diameter of 1 to 100 μm in the liquid to be processed. A liquid processing apparatus characterized in that a gas-liquid mixed fluid is generated by microbubble generation and the gas-liquid mixed fluid is supplied again into the liquid to be processed. The liquid processing apparatus according to claim 1, wherein the gas discharge unit includes a gas supply unit that introduces a specific gas or a mixed gas formed by mixing a plurality of types of gases. The liquid processing apparatus according to claim 1, wherein the gas discharge unit and the microbubble generating unit have a detachable structure.

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