JP2013223824A - Fine bubble utilizing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To alter the ratio and density of ozone bubbles of a micro-nano size while reducing operation cost.SOLUTION: A fine bubble utilizing apparatus S1 includes: a reaction tank 1 for storing a solution to be treated; first fine bubble generating parts 2-5 for circulating the solution to be treated in the reaction tank 1 to introduce ozone into the solution to be treated and injecting the solution to be treated, in which fine ozone bubbles are generated, in the reaction tank 1 from a first fine bubble injection port 6; a fine bubble inflow port 11 provided at an almost same height as the first fine bubble injection port 6; a solution-to-be- treated suction port 12 provided at a place lower than the first fine bubble injection port 6; second fine bubble generation parts 3, 4, 7, 8, 10 and 14 for generating fine ozone bubbles from the solution to be treated in a case that the solution to be treated in the reaction tank 1 is allowed to flow in the reaction tank 1 from the fine bubble inflow port 11 by circulating the solution to be treated in the reaction tank 1 and introducing ozone to generate its fine ozone bubbles in a case that the solution to be treated in the reaction tank 1 is allowed to flow in from the solution-to-be-treated suction port 12; and a control device 15 for controlling the first and second fine bubble generation parts.

Description

  The present invention relates to a fine bubble utilization apparatus that generates fine bubbles of ozone and treats a liquid to be treated with ozone.

Since ozone has an oxidizing power and is soluble in water, in the field of water treatment, it is used for organic substance removal, oxidation of reducing substances, chromaticity removal, odor removal, sterilization, disinfection, and the like.
By the way, since the electric power which supplies energy is consumed when producing | generating ozone, a running cost increases. For this reason, when ozone is used by being dissolved in the liquid to be treated in water treatment, the solubility of ozone is related to the amount of ozone consumed, so that improvement of ozone dissolution efficiency becomes a problem.

As a measure for improving the dissolution efficiency, there is a method of reducing ozone bubbles because the smaller the bubbles of ozone, the less self-decomposition and longer lasting.
Microbubbles include micrometer (10 ⁻⁶ m) size microbubbles and nanometer (10 ⁻⁹ m) size nanobubbles.

In order to generate nanobubbles, there is a method in which microbubbles are first generated and energy is further applied to the microbubbles. Since nanobubbles have a longer residence time in the liquid to be treated and a longer concentration half-life than microbubbles, nanobubbles can be used in a place separated from the production place. Thus, nanobubbles have advantages over microbubbles, but energy is consumed for their generation. Therefore, in order to reduce energy consumption, a system that can change the generation ratio of microbubbles and nanobubbles according to the application is desirable.
Patent Documents 1 and 2 are examples of methods for generating microbubbles and nanobubbles.

JP 2011-121002 A JP 2008-104608 A

  In Patent Document 1, first, microbubbles are generated and nanobubbles are generated in a series of steps in the next step. In Patent Document 1, since the generation of microbubbles is not considered (purposed), the ratio of microbubbles to nanobubbles cannot be changed. Even when microbubbles are sufficient, only nanobubbles are generated, so the energy consumption of the pressurizing means is constantly increasing, which may increase the cost.

In patent document 2, the micro nano bubble generator is arrange | positioned up and down, the micro nano bubble produced | generated by the lower part is attracted | sucked by upper part, and the particle size is made small by further processing. The lower micro / nano bubble generator may generate coarse bubbles having a relatively large particle diameter, and the coarse bubbles rise to reach the water surface.
In addition, since the micro / nano bubble generators are installed above and below, the upper micro / nano bubble generator may suck the coarse bubbles and inhibit the generation of nano bubbles.
In addition, the operating method of changing the bubble size ratio is not considered, i.e. out of consideration.

  In view of the above circumstances, the present invention is to provide a microbubble utilization apparatus that can change the ratio of the micro-sized bubbles and the nano-sized bubbles of ozone and the density of each bubble according to the application, and can reduce the operation cost.

  In order to solve the above-mentioned problem, the apparatus for using fine bubbles of the first aspect of the present invention includes a reaction tank for storing a liquid to be processed, a liquid to be processed in the reaction tank, and ozone contained in the liquid to be processed. First, ozone fine bubbles are generated, and a first microbubble generating portion for injecting the liquid to be treated into which the fine bubbles are mixed from the first microbubble inlet into the reaction vessel, and the first microbubble inlet, The fine bubble inlet provided horizontally or substantially at the same height, the treatment liquid suction port provided at a position lower than the first fine bubble inlet, and the treatment liquid in the reaction tank are circulated, and When the liquid to be treated in the reaction tank is introduced from the fine bubble inlet, fine bubbles of ozone are generated from the liquid to be treated, while the liquid to be treated in the reaction tank is introduced from the liquid suction port. If the liquid to be treated is The moistened includes a second fine-bubble generator for generating fine bubbles of ozone, and a control device for controlling the first fine-bubble generating portion and the second micro-bubble generating unit.

  The apparatus for using fine bubbles according to the second aspect of the present invention is the apparatus for using fine bubbles according to the first aspect of the present invention, wherein the first fine bubble generating unit is a first pressure pump that circulates the liquid to be treated in the reaction tank. A first ozone supply device for supplying ozone to the liquid to be treated which is sent via the first pressure pump; and an ozone solution containing the ozone in the liquid to be treated to depressurize ozone fine bubbles. A first pressure reducing nozzle for generating and a first fine bubble inlet for injecting fine bubbles generated by the first pressure reducing nozzle into the reaction tank, and A second pressure pump for circulating the liquid to be treated in the reaction tank, a second ozone supply device for supplying ozone to the liquid to be treated sent via the second pressure pump, and ozone for the liquid to be treated Depressurize the ozone dissolved solution containing And a sampling port switching valve that switches the sampling port to the inlet side of the second pressurizing pump to the fine bubble inlet or the processing target liquid suction port. Yes.

  The apparatus for using fine bubbles of the third aspect of the present invention is the apparatus according to the second aspect of the present invention, wherein an ozonizer for injecting ozone gas into a pipe between the first pressure pump and the reaction tank, and a flow direction of the first pressure pump A gas-liquid separation tank installed in the gas tank, a buffer tank for temporarily storing the gas separated in the gas-liquid separation tank, a gas diffusion device for dissolving the gas in the buffer tank in the liquid to be treated in the reaction tank, A reinjection gas switching valve that is provided between the buffer tank and the diffuser and switches the gas in the buffer tank to either the diffuser or a pipe between the second pressurizing pump and the reaction tank. The control device further controls the reinjection switching bubble.

  ADVANTAGE OF THE INVENTION According to this invention, the microbubble utilization apparatus which can change the ratio of each microbubble of ozone and the bubble of nanosize, and each bubble density according to a use and can reduce an operating cost is realizable.

It is a figure which shows the structure of the microbubble utilization apparatus of 1st Embodiment of this invention. It is a figure which shows the state which is performing the microbubble production | generation operation | movement with a microbubble utilization apparatus. It is a figure which shows the state which is performing the nano bubble production | generation operation | movement of ozone with a microbubble utilization apparatus. It is a figure which shows the microbubble utilization apparatus of 2nd Embodiment of this invention.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
(First embodiment)
FIG. 1 shows a microbubble utilization device S1 according to the first embodiment of the present invention.
The fine bubble utilization apparatus S1 of the first embodiment is an apparatus that dissolves ozone (O ₃ ) in a reaction liquid (liquid to be processed), or ozone-treats water to be processed (liquid to be processed).
The fine bubble utilization device S1 has a function of selecting a ratio between ozone microbubbles and nanobubbles according to the liquid to be treated. As described above, the microbubble is a micrometer (10 ⁻⁶ m) size ozone bubble, and the nanobubble is a nanometer (10 ⁻⁹ m) size ozone bubble.

In the fine bubble utilization device S1, a reaction liquid (treatment liquid) for dissolving ozone or a treatment water (treatment liquid) for ozone treatment is dissolved in a reaction tank 1 for generating ozone bubbles in the treatment liquid. Injected. In addition, although the raw | natural water supply means of a reaction liquid or to-be-processed water is not shown in figure, it is comprised with a pump etc.
The fine bubble utilization device S1 is controlled by a control means 15 which is a controller such as a PLC (programmable logic controller).

  The control means 15 includes a pump control circuit, a valve switching circuit, an ozonizer control circuit, a sensor circuit such as a sensor signal amplifier circuit, an AC / DC / DC / AC converter, and the like in addition to a microcomputer. The function of the control means 15 is realized by executing a control program stored in the memory.

The operation of ozone supply in the reaction tank 1 can be performed by continuously starting the raw water supply means and supplying raw water into the reaction tank 1 to generate bubbles of ozone, or by starting the raw water supply means. Either batch processing may be employed in which the raw water supply means is stopped while the raw water is filled and ozone bubbles are generated.
A part of the reaction liquid in the reaction tank 1 is circulated by the first pressure pump 2, and a first circulation line that mainly generates microbubbles in the reaction liquid (liquid to be treated), and a second pressure pump 10. Is circulated in the second circulation line that mainly generates nanobubbles or microbubbles in the reaction liquid (liquid to be treated).

The first circulation line sucks the reaction liquid (liquid to be treated) from the suction port 1a in the reaction tank 1, and the first pressure pump 2, the steam / water separation tank 4, the first pressure reducing nozzle 5, and the first fine line. This is a path to the reaction tank 1 through the bubble inlet 6. Ozone gas is supplied from the ozonizer 3 to the flow of the liquid to be treated in the pipe k11 between the suction port 1a of the reaction tank 1 and the first pressure pump 2.
The second circulation line sucks the reaction liquid (liquid to be processed) from the fine bubble suction port 11 or the reaction liquid suction port 12 in the reaction tank 1, and sucks the suction port switching bubble 13, the second pressure pump 10, the second This is a path that reaches the reaction tank 1 through the decompression nozzle 14. The ozone gas in the buffer tank 7 is supplied from the suction port switching bubble 13 to the second circulation line or the air diffuser 9.

<Operation of the first circulation line>
Next, the operation of the first circulation line will be described.
A gas-liquid mixed fluid of the reaction liquid sucked from the reaction tank 1 and the ozone gas supplied from the ozonizer 3 flows into the first pressurizing pump 2 of the first circulation line. The gas-liquid mixed fluid is pressurized by the first pressurizing pump 2 and the ozone gas is dissolved to become high-pressure ozone liquid, which flows into the gas-water separation tank 4 and is gas-liquid separated.
The high-pressure ozone liquid flowing out from the steam / water separation tank 4 is decompressed by the first decompression nozzle 5, and the dissolved ozone is generated as fine bubbles (mainly microbubbles). The fine bubbles are supplied to the reaction tank 1 via (via) the first fine bubble inlet 6.

  On the other hand, the undissolved gas separated from the high pressure ozone liquid by the gas-liquid separation in the gas-water separation tank 4 flows to the diffuser 9 through the buffer tank 7 by the reinjection gas switching valve 8 or the second circulation. It is injected into one of the flows to the line. The flow to the second circulation line is a flow to the pipe k21 between the suction port switching bubble 13 and the second pressurizing pump 10.

<Operation of the second circulation line>
Next, the operation of the second circulation line will be described.
In the second circulation line, first, the reaction liquid (liquid to be processed) in the reaction tank 1 is sucked from either the fine bubble suction port 11 or the reaction liquid suction port 12 by switching the suction port switching bubble 13.
When the reaction liquid (processed liquid) in the reaction tank 1 is sucked from the reaction liquid suction port 12 by switching the suction port switching bubble 13, the reinjection gas switching valve 8 is set to the second circulation line side (suction port switching bubble). By switching to the pipe k21) between the first pressure pump 10 and the second pressure pump 10, the gas in the buffer tank 7 is mixed with the reaction liquid that has passed through the suction port switching bubble 13 and pressurized by the second pressure pump 10. The

As described above, the buffer tank 7 stores the gas-liquid mixed fluid (high-pressure ozone liquid) of the reaction liquid and the ozone gas supplied from the ozonizer 3, and the gas ozone-gas separated in the gas-water separation tank 4. Has been.
The pressurized liquid pressurized by the second pressure pump 10 is decompressed by the second decompression nozzle 14 to generate fine bubbles (mainly microbubbles).

On the other hand, when the reaction liquid (processed liquid) in the reaction tank 1 is sucked from the fine bubble suction port 11 by switching the suction port switching bubble 13, the reinjection gas switching valve 8 is switched to the air diffuser 9 side. Thus, ozone gas in the buffer tank 7 is supplied from the diffuser 9 to the reaction solution in the reaction tank 1.
The pressurized liquid containing microbubbles (from the first circulation line) sucked from the fine bubble suction port 11 and pressurized by the second pressurizing pump 10 is depressurized by the second decompression nozzle 14, and the fine bubbles (mainly nanobubbles) ) Is generated.

The generation of nanobubbles or the generation of microbubbles in the second circulation line will be described in detail. The fine bubble suction port 11 which is one suction port of the second circulation line is a micro-bubble to the reaction tank 1 in the first circulation line. The first fine bubble injection port 6 which is a bubble discharge port is installed horizontally or substantially at the same height.
Therefore, the microbubbles (mainly microbubbles) discharged from the first microbubble inlet 6 are discharged from the first microbubble inlet 6 by the outflow of the reaction liquid containing microbubbles in the horizontal direction from the first microbubble inlet 6 to the second circulation line. The fine bubble suction port 11 of the suction port is sucked, but other coarse bubbles are difficult to suck.

On the other hand, the reaction liquid suction port 12 which is the other suction port of the second circulation line is lower or lower than the first fine bubble injection port 6 of the discharge port to the reaction tank 1 of the first circulation line. Since it is provided at the position, it is difficult to suck fine bubbles (mainly microbubbles) from the first circulation line. The reaction liquid suction port 12 may be provided at the bottom of the reaction tank 1.
Since the reaction liquid suction port 12 is provided below the first fine bubble injection port 6 for discharging fine bubbles (mainly microbubbles) from the first circulation line, the reaction solution suction port 12 is discharged from the first fine bubble injection port 6. Since the microbubbles move upward due to buoyancy, the reaction liquid suction port 12 is arranged so as not to suck the microbubbles accumulated in the reaction tank 1.

  The second circulation line is contained in the reaction solution sucked by the second pressurizing pump 10 because the reaction solution is pressurized by the second pressurizing pump 10 and depressurized and sheared by the second depressurizing nozzle 14. Gas can be refined. Therefore, in the second circulation line, micro-sized ozone gas can be mainly generated when millimeter-size ozone gas is sucked, and nano-sized ozone gas can be mainly generated when micro-sized ozone gas is sucked.

  Therefore, as described above, when switching to the fine bubble suction port 11 with the suction port switching bubble 13, the first is a discharge port for the fine bubbles (mainly microbubbles) in the first circulation line to the reaction tank 1. Since the fine bubble suction port 11 sucks fine bubbles (mainly microbubbles) from the fine bubble inlet 6, mainly nanobubble ozone is generated in the second circulation line.

On the other hand, when switching to the reaction liquid suction port 12 with the suction port switching bubble 13, the reaction liquid is supplied from below the first fine bubble injection port 6, which is a microbubble discharge port to the reaction tank 1 of the first circulation line. Since the suction is performed, the microbubble ozone is mainly generated in the second circulation line without sucking the microbubbles.
As described above, the ozone generation amount in the ozonizer 3, the flow rate and pressure of the first pressurization pump 2, the flow rate and pressure of the second pressurization pump 10, switching of the reinjection gas switching valve 8, switching of the suction port switching valve 13 Switching is controlled by the control means 15.

<Microbubble generation operation method>
Hereinafter, an ozone microbubble generation operation method by the control means 15 will be described.
In FIG. 2, the state which is performing the microbubble production | generation operation | movement with the microbubble utilization apparatus S1 is shown.
The control means 15 switches the reinjection gas switching bubble 8 to a pipe k21 between the suction port switching valve 13 on the second circulation line side and the second pressurizing pump 10, and the suction port switching valve 13 is sucked into the reaction solution. Switch to the mouth 12 side. As described above, since the reaction liquid suction port 12 is positioned below the first fine bubble injection port 6 that discharges microbubbles, the suction of the microbubbles can be suppressed.

  Next, the control means 15 confirms that the reaction liquid in the reaction tank 1 is sufficiently filled in the tank based on a detection signal from a water level meter (not shown) disposed in the reaction tank 1. Then, the 1st pressurization pump 2 of the 1st circulation line and the 2nd pressurization pump 10 of the 2nd circulation line are started, and it maintains at a predetermined circulation flow rate and pressure.

Information on a predetermined circulation flow rate and pressure in the first circulation line includes, for example, a detection signal of a flow sensor (not shown) arranged in the pipe k11 and a detection signal of a pressure sensor (not shown) arranged in the pipe k12. Is obtained by the control means 15.
Information on a predetermined circulation flow rate and pressure in the second circulation line includes, for example, a detection signal of a flow sensor (not shown) arranged in the pipe k21 and a detection signal of a pressure sensor (not shown) arranged in the pipe k22. Is obtained by the control means 15.
The positions of the flow sensor and the pressure sensor described may be arranged at any position as long as necessary measurement can be performed.

Next, the ozonizer 3 is started and adjusted to a predetermined gas concentration and flow rate.
The concentration of the ozone gas from the ozonizer and the flow rate thereof are acquired by the control means 15 from the respective detection signals of the ozone gas concentration meter (not shown) and the flow rate sensor that are arranged in the pipe k1.
The gas flow rate of the ozonizer 3 is about 10% of the flow rate of the reaction liquid (processed liquid) of the first pressurization pump 2 in the first circulation line, and the first pressurization pump 2 is not idling. It is set under the condition that the second pressurizing pump 10 in the two circulation lines does not idle with the gas from the buffer tank 7.
By this operation, the second circulation line can suck the millimeter-sized gas from the buffer tank 7, so that mainly micro-sized bubbles are generated by the pressure reduction at the second pressure-reducing nozzle 14.

<Nano bubble generation operation method>
Next, an ozone nanobubble generation operation method by the control means 15 will be described.
In FIG. 3, the state which is performing the nano bubble production | generation operation | movement of ozone with the microbubble utilization apparatus S1 is shown.
The control means 15 switches the reinjection gas switching bubble 8 to the diffuser 9 side that diffuses the reaction liquid in the reaction tank 1 and switches the suction port switching valve 13 of the second circulation line from the first circulation line. Switching to the fine bubble suction port 11 side for sucking fine bubbles (mainly microbubbles).

Next, the control means 15 confirms that the reaction liquid in the reaction tank 1 is sufficiently filled in the tank based on a detection signal from a water level meter (not shown) disposed in the reaction tank 1.
Thereafter, the first pressurizing pump 2 of the first circulation line and the second pressurizing pump 10 of the second circulation line are activated, and predetermined circulating flow rates and pressures are determined based on the detection signals of the respective flow sensors and pressure sensors. To maintain.

Next, the ozonizer 3 is activated and adjusted to a predetermined ozone gas concentration and flow rate based on the detection signals of the ozone gas concentration meter and the flow rate sensor.
The gas flow rate from the ozonizer 3 is set to be about 10% of the flow rate of the first pressurization pump 2 in the first circulation line and the first pressurization pump 2 is not idling.
By this operation, the second circulation line is mainly sucked with ozone gas of fine bubbles (mainly micro size) discharged from the first fine bubble inlet 6 generated in the first circulation line, so that the second decompression nozzle By reducing the pressure at 14, nano-sized ozone bubbles can be generated.

Here, even when obtaining nano-sized bubbles of ozone, since there are few micro-sized bubbles in the reaction tank 1 at the start of operation, first, as a mode shown in FIG. The bubbles of nano-sized ozone can be efficiently generated by filling the bubbles and setting the mode shown in FIG. 3 after the operation for a predetermined time.
Moreover, since the control means 15 can control the flow volume and pressure of the 2nd pressurization pump 10 of a 2nd circulation line, it can change the production amount of the nanosize bubble produced | generated by a 2nd circulation line. In addition, the control means 15 can adjust the micro-sized ozone, the ratio of nano-sized bubbles and the concentration of each bubble in the reaction solution in the reaction tank 1.

For this reason, the control means 15 can change the average bubble diameter of the reaction liquid in the reaction tank 1 by controlling the operation of the second pressure pump 10 that generates nano-sized bubbles. In other words, by controlling the second pressurizing pump 10, it has a function of adjusting the average bubbles in the reaction liquid (processed liquid) in the reaction tank 1 to the target value.
Further, the control means 15 changes the resistance of the second pressure reducing nozzle 14 responsible for pressure reduction and shearing of the reaction liquid (liquid to be treated) when changing the flow rate and pressure of the second pressure pump 10 in the second circulation line. It is good to let them. The resistance may be changed by changing the cross-sectional area through which the reaction liquid (liquid to be treated) passes.

In general, since nano-sized bubbles have a longer residence time than micro-sized bubbles, it is better to increase the ratio of nano-size when used away from the production site. In order to increase the concentration of micro-sized bubbles, the operation in the mode shown in FIG. 2 may be continued to increase the number of micro-sized bubbles.
Therefore, it is possible to provide the ozone microbubble utilization device S1 that can change the ratio of the micro-sized bubbles to the nano-sized bubbles and increase the concentration of each bubble, and can change the bubble conditions according to the application.

(Second Embodiment)
FIG. 4 shows a microbubble utilization apparatus S2 according to the second embodiment of the present invention.
The fine bubble utilization device S2 of the second embodiment relates to a cleaning method using ozone liquid (water). Cleaning includes treatment by ozone oxidation using ozone (O ₃ ), organic substance removal, chromaticity removal, odor removal, sterilization, disinfection, and the like.

  The fine bubble utilization device S2 is a water supply pump 16 (right side in FIG. 4) for feeding the reaction liquid (liquid to be treated) in the reaction tank 1 to the fine bubble utilization device S1 (see FIG. 1) of the first embodiment. 2), the cleaning target tank 17 that receives the reaction liquid from the water pump 16, and the dissolved ozone concentration (unit reaction liquid (to-be-processed) of the reaction liquid used in the cleaning target tank 17 downstream of the cleaning target tank 17. A dissolved ozone concentration meter 18 for measuring the amount of ozone in the liquid) is installed. A cleaning target (object to be cleaned) is accommodated in the cleaning target tank 17, and the cleaning target is cleaned with the dissolved ozone of the reaction liquid sent from the reaction tank 1.

The dissolved ozone concentration meter 18 is applicable to any measuring means that can obtain a correlation with the amount of dissolved ozone.
The control of the water pump 16 is performed by the control means 15, and the measurement signal (measured value) of the dissolved ozone concentration meter 18 is transmitted to the control means 15.

Hereinafter, an operation method of the fine bubble utilization device S2 will be described.
The dissolved ozone concentration of the reaction liquid (processed liquid) in the reaction tank 1 is measured by a dissolved ozone concentration meter (not shown) provided in the reaction tank 1, and the measurement signal is transmitted to the control means 15. As a means for grasping the dissolved ozone concentration in the reaction tank 1, any measuring means capable of obtaining the amount of dissolved ozone with respect to the amount of the reaction liquid (liquid to be treated), that is, the dissolved ozone concentration can be applied.
The control means 15 starts the water pump 16 after the dissolved ozone concentration of the reaction liquid (processed liquid) in the reaction tank 1 reaches a predetermined value.

Moreover, you may control starting of the water supply pump 16 by the control means 15 by the elapsed time from the operation start on the microbubble production | generation conditions of FIG. 2, or the nanobubble production | generation conditions of FIG.
Further, the control means 15 measures the dissolved ozone concentration of the reaction liquid discharged from the cleaning target tank 17 in which the cleaning target (object to be cleaned) and the reaction liquid (processed liquid) from the reaction tank 1 are accommodated. Measurement information (measurement signal) of the ozone concentration meter 18 is acquired. Since the dissolved ozone concentration indicated by the measurement value (measurement signal) of the dissolved ozone concentration meter 18 is consumed by the cleaning of the cleaning target in the cleaning target tank 17, immediately after the reaction liquid is sent from the reaction tank 1. It is low and rises as time elapses from feeding and ozone consumption is reduced.

The control means 15 indicates that the dissolved ozone concentration indicated by the measured value (measurement signal) of the dissolved ozone concentration meter 18 is 1) increased and converged within a certain range, 2) increased and reached the target value, 3 ) When it rises and converges to a predetermined change amount, it is determined that the cleaning of the cleaning target (object to be cleaned) in the cleaning target tank 17 is completed, and the operation of the water pump 16 is stopped. To do.
In addition, when the measured value of the dissolved ozone concentration meter 18 does not increase even after a predetermined time has elapsed, the control means 15 increases the flow rate or pressure of the second pressurizing pump 10 under the nanobubble generation conditions of FIG. By this operation, nano-sized bubbles in the reaction vessel 1 are increased. Since nano-sized bubbles have a long half-life (lifetime), the concentration of dissolved ozone in the reaction tank 1 increases.

For this reason, the dissolved ozone that has not been consumed by the cleaning in the cleaning target tank 17 reaches the dissolved ozone concentration meter 18.
The control means 15 changes the operating conditions of the second pressurizing pump 10 and, after a predetermined time has elapsed, the dissolved ozone concentration indicated by the measured value (measurement signal) of the dissolved ozone concentration meter 18 increases by 1) to a certain range. If it is any one of 2) rising and reaching the target value, 3) rising and converging to the predetermined change amount, it is determined that the cleaning is completed, and the water pump 16 operation is stopped.

  According to the second embodiment, it is possible to provide an ozone microbubble utilizing apparatus S2 that can change the ratio of micro-sized bubbles to nano-sized bubbles and increase the concentration of these bubbles, and can change the bubble conditions according to the application.

(Third embodiment)
The fine bubble utilization apparatus of the third embodiment is the same as the fine bubble utilization apparatus S2 of the second embodiment of FIG. 2, based on the volume of the cleaning target tank 17 and the flow rate of the water supply pump 16. ) Is provided in the control means 15.
The longer the residence time of the reaction liquid (liquid to be treated) in the tank 17 to be cleaned, the more the dissolved ozone self-decomposes, so the cleaning power decreases. For this reason, it is necessary to increase the bubbles of nano-sized ozone having a long half-life (lifetime).

  The control means 15 has a relational expression (f (HRT, Q, P) = 0) between the residence time HRT of the cleaning target tank 17 and the flow rate Q or pressure P of the second pressurizing pump 10 under the nanovalve generation conditions of FIG. The user inputs in advance or is set by the system, and controls the flow rate Q or pressure P of the second pressurizing pump 10 according to the calculation result of the residence time HRT.

  For example, the residence time HRT or / and the flow rate Q or / and pressure P of the second pressurizing pump 10 are displayed on the screen of a management terminal such as a personal computer that the user visually observes, and the residence that the user inputs or sets Depending on the time HRT and / or the flow rate Q or / and the pressure P of the second pressurizing pump 10, the control means 15 uses the relational expression (f (HRT, Q, P) = 0) to determine the residence time HRT. The flow rate Q and pressure P of the second pressurizing pump 10 may be controlled.

  Alternatively, the residence time HRT or / and the flow rate Q or / and pressure P data of the second pressurizing pump 10 are transmitted from another control or information system, and the control means 15 transmits the relational expression (f (HRT, Q, P ) = 0) may be used to control the residence time HRT, the flow rate Q of the second pressurizing pump 10, and the pressure P.

According to the third embodiment, the half-life (life) of the dissolved ozone concentration can be increased by increasing the nano-sized bubbles, and the cleaning power of the cleaning target (object to be cleaned) in the cleaning target tank 17 or the like as necessary. Can be maintained or improved.
The control means 15 has a function of determining the end of cleaning by the method of the second embodiment and stopping the water pump 16.

Further, the control means 15 controls the second pressurizing pump 10 according to the distance to the cleaning target tank 17 or the water supply arrival time, and changes the ratio of the micro-sized bubbles to the nano-sized bubbles and / or the concentration of each bubble. May be changed.
Therefore, it is possible to provide a device for using ozone fine bubbles that can change the ratio of the micro-sized bubbles to the nano-sized bubbles and increase or decrease the concentration of each bubble, and can change the bubble conditions according to the application.

<< Other Embodiments >>
In the above-described embodiment, the case where the ozonizer 3 is provided in the pipe k11 between the reaction tank 1 and the first pressurizing pump 2 is illustrated, but a configuration may be adopted in which the ozonizer 3 is provided downstream of the first pressurizing pump 2. However, as described above, when the ozonizer 3 is provided in the pipe k11 between the reaction tank 1 and the first pressurizing pump 2, the ozone from the ozonizer 3 is pressurized by the first pressurizing pump 2 to be treated with the liquid to be treated. It is more desirable because it can be dissolved.

  In the above embodiment, the case where ozone is supplied to the liquid to be processed flowing into the second pressurizing pump 10 through the ozonizer 3, the steam separation tank 4, and the buffer tank 7 is exemplified. A separate ozonizer may be provided to supply ozone directly to the liquid to be processed flowing into the second pressure pump 10. In this case, an ozone amount control means for making the amount of ozone supplied to the liquid to be processed flowing into the second pressurizing pump 10 appropriate is provided or supplied to the liquid to be processed flowing into the second pressurizing pump 10. The amount of ozone may be set appropriately in advance.

  Alternatively, ozone may be directly supplied to the liquid to be treated flowing into the second pressurizing pump 10 by providing a pipe from the ozonizer 3 without providing the air / water separation tank 4 and the buffer tank 7. In this case as well, an ozone amount control means similar to that described above may be provided, or the amount of ozone supplied to the liquid to be processed flowing into the second pressurizing pump 10 may be set appropriately in advance.

  Moreover, in the said embodiment, although the reinjection gas switching valve 8 was made into the three-way valve, the structure switched to the diffuser 9 and the piping k21 between the 2nd pressure reduction nozzle 14 and the 2nd pressurization pump 10 was illustrated. The re-injection gas switching valve 8 is not provided and the re-injection gas switching valve 8 is a two-way valve, and ozone is supplied to the liquid to be treated sent by the second pressurizing pump 10 only during the micro bubble generation operation, while the nano bubble generation operation is performed. Sometimes, the supply of ozone may be stopped.

  The above-described control means 15 exemplifies the case where the function of the fine bubble utilization device (S1, S2) is performed using a control program, but at least a part of the function is an IC (Integrated Circuit) other than the control program. It may be controlled by hardware such as LSI (Large Scale Integration). Further, the control means 15 may perform control by a remote server or cloud computing as long as security can be maintained, and various embodiments of the control means 15 can be selected.

While various embodiments of the present invention have been described above, the description is intended to be exemplary.
That is, the present invention is not limited to the above-described embodiment, and includes various modifications. For example, the above-described embodiment has been described in detail for easy understanding of the present invention, and is not necessarily limited to one having all the configurations described.

In addition, a part of the configuration of an embodiment can be replaced with another embodiment, and the configuration of another embodiment can be added to the configuration of an embodiment. Moreover, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.
Thus, various modifications and changes are possible within the scope of the present invention. That is, the present invention can be arbitrarily changed as appropriate without departing from the spirit of the invention.

1 Reaction tank 2 First pressurizing pump (first ozone supply device, first fine bubble generating unit)
3 Ozonizer (1st ozone supply device, 1st fine bubble generating part, 2nd fine bubble generating part)
4 Gas-water separation tank (gas-liquid separation tank, first fine bubble generating part, second fine bubble generating part)
5 First decompression nozzle (first microbubble generator)
6 1st microbubble inlet 7 Buffer tank (2nd microbubble generator)
8 Reinjection gas switching valve (second fine bubble generating part 9 air diffuser 10 second pressure pump (second fine bubble generating part)
11 Fine bubble suction port (fine bubble inlet)
12 Reaction liquid suction port (treatment liquid suction port)
13 Suction port switching valve (Liquid sampling port switching valve, second microbubble generator)
14 Second decompression nozzle (second microbubble generator)
15 Control means (control device)
16 Water supply pump 17 Washing target tank 18 Dissolved ozone concentration meter k11 Pipe (pipe between the first pressure pump and the reaction tank)
k21 piping (piping between the second pressure pump and the reaction tank)
S1, S2 Fine bubble utilization device

Claims (9)

A reaction tank for storing the liquid to be treated;
The treatment liquid in the reaction tank is circulated and ozone is included in the treatment liquid to generate fine bubbles of ozone, and the treatment liquid in which the fine bubbles are mixed is supplied from the first fine bubble inlet to the reaction tank. A first fine bubble generating part to be injected into the inside,
A fine bubble inlet provided horizontally or substantially at the same height as the first fine bubble inlet;
To-be-treated liquid suction port provided at a position lower than the first fine bubble injection port,
While circulating the liquid to be treated in the reaction tank and injecting the liquid to be treated in the reaction tank from the fine bubble inlet, fine bubbles of ozone are generated from the liquid to be treated, while the liquid to be treated is treated. A second fine bubble generating unit for generating ozone fine bubbles by containing ozone in the liquid to be processed when the liquid to be processed in the reaction tank is caused to flow from the liquid suction port;
A control apparatus that controls the first microbubble generation section and the second microbubble generation section. A reaction tank for storing the liquid to be treated;
A first pressure pump for circulating the liquid to be treated in the reaction tank;
A first ozone supply device for supplying ozone to the liquid to be treated sent via the first pressure pump;
A first depressurizing nozzle for depressurizing the ozone-dissolved solution containing ozone in the liquid to be treated to generate fine ozone bubbles;
A first fine bubble inlet for injecting fine bubbles generated by the first vacuum nozzle into the reaction vessel;
A second pressure pump for circulating the liquid to be treated in the reaction tank;
A second ozone supply device for supplying ozone to the liquid to be treated sent via the second pressure pump;
A second decompression nozzle for depressurizing an ozone solution containing ozone in the liquid to be treated to generate fine ozone bubbles;
A fine bubble inlet provided horizontally or substantially at the same height as the first fine bubble inlet;
A liquid suction port to be processed provided at a position lower than the first fine bubble inlet;
A sampling port switching valve for switching the sampling port to the inlet side of the second pressurization pump to the fine bubble inlet or the liquid suction port to be treated;
A device for using fine bubbles, comprising: the first pressurizing pump, the second pressurizing pump, and a control device that controls the liquid collection port switching valve. In the fine bubble utilization apparatus of Claim 2,
The control device includes:
A microbubble generation mode for switching the liquid collection port switching valve to the liquid suction port side to be treated;
A fine bubble utilization device, comprising: a nanobubble generation mode that stops supply of ozone from the second ozone supply device and switches the liquid collection port switching valve to the fine bubble inlet side. A reaction tank for storing the liquid to be treated;
A first pressure pump for circulating the liquid to be treated stored in the reaction tank;
An ozonizer for injecting ozone gas into the pipe between the first pressure pump and the reaction vessel;
A gas-liquid separation tank installed in the flow-down direction of the first pressure pump;
A first depressurizing nozzle for depressurizing the ozone-dissolved liquid that has passed through the gas-liquid separation tank to generate ozone fine bubbles;
A first fine bubble inlet for injecting fine bubbles of ozone generated by the first vacuum nozzle into the reaction vessel;
A buffer tank for temporarily storing the gas separated in the gas-liquid separation tank;
A diffuser for dissolving the gas in the buffer tank in the liquid to be treated in the reaction tank;
A second pressure pump for circulating the stored liquid in the reaction tank;
A reinjection gas switching valve that is provided between the buffer tank and the diffuser and switches the gas in the buffer tank to either the diffuser or a pipe between the second pressurizing pump and the reaction tank. When,
A second depressurizing nozzle for depressurizing the ozone solution through the second pressurizing pump to generate fine ozone bubbles;
A fine bubble inlet provided horizontally or substantially at the same height as the first fine bubble inlet;
A liquid suction port to be processed provided at a position lower than the first fine bubble inlet;
A sampling port switching valve for switching the sampling port to the inlet side of the second pressurization pump to the fine bubble inlet or the liquid suction port to be treated;
A fine bubble utilization device comprising: the first pressurizing pump, the second pressurizing pump, the reinjection switching bubble, and a control device that controls the liquid collection port switching valve. In claim 4,
The control device switches the reinjection gas switching valve to the piping side between the second pressurization pump and the reaction tank, and further switches the sampling port switching bubble to the liquid suction port side to be processed. When,
A fine bubble utilization device comprising: a nanobubble generation mode that switches the reinjection gas switching valve to the diffuser side and further switches the liquid collection port switching valve to the fine bubble inlet side. In claim 5,
The said control apparatus is set to the said microbubble production | generation mode at the time of an operation start, and is provided with the function to switch from the said microbubble production | generation mode to the said nanobubble production | generation mode after predetermined time progress. The microbubble utilization apparatus characterized by the above-mentioned. In claim 6,
The control device has a function of changing any one or more of the circulation flow rate and the pressure of the second pressurizing pump according to a target value of an average bubble diameter of the liquid to be treated in the reaction tank. A device that uses fine bubbles. In the fine bubble utilization apparatus of any one of Claims 1-7,
A water supply pump that is controlled by the control device and supplies the liquid to be treated in the reaction tank;
A tank to be cleaned, which is provided on the downstream side of the water pump, and stores an object to be cleaned,
A dissolved ozone concentration meter that measures the dissolved ozone concentration of the reaction solution flowing out of the tank to be cleaned,
The control device includes:
The fine bubble utilization apparatus characterized by controlling the residence time of the to-be-processed liquid in the said washing | cleaning object tank or the said water supply pump according to the level of the said dissolved ozone concentration. In the fine bubble utilization apparatus of any one of Claims 2-7,
A water supply pump that is controlled by the control device and supplies the liquid to be treated in the reaction tank;
Provided on the downstream side of the water pump, and a tank to be cleaned in which an object to be cleaned is stored,
The control device includes:
One or more of the function of calculating the residence time of the liquid to be treated in the tank to be cleaned by the feed of the water pump and the circulation flow rate and pressure of the second pressurizing pump increase as the residence time increases. A device for utilizing fine bubbles, characterized in that

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