JP2020065966A - Purifier and ozone supply device - Google Patents

Abstract

To provide a purifier and an ozone supply device, capable of preventing backward flow of ozone so as to secure quality of the device.SOLUTION: A purifier which purifies the soil using a well 1 inserted in the soil comprises an ozone generator 2 for generating ozone, an exhaust gas treatment part 130 as an ozone removal part for removing ozone when refluxed from the well 1, and a control part 71. The exhaust gas treatment part 130 treats ozone, and the control part 71 controls the flow rate of ozone delivered to the exhaust gas treatment part 130.SELECTED DRAWING: Figure 1

Description

  The present application relates to a purification device and an ozone supply device.

  The conventional purifying apparatus injects ozone into the contaminated soil for a predetermined time to perform ozone treatment of the contaminated soil.

JP, 2000-325935, A

  Conventional purifiers supply ozone with an ozone generator, but when starting ozone generation in the ozone generator, the pressure of the injection part is higher than the internal pressure of the ozone generator, or the ozone injection part is not visible. When it is clogged due to clogging or the like, ozone flows back into the ozone generator, and there is a problem that the quality of the ozone generator and the raw material gas supply unit to the ozone generator is deteriorated. Further, when the ozone generator and the raw material gas supply unit are provided with ozone resistance in preparation for the reverse flow of ozone, there is a problem that the cost of the purifier increases.

  The present application discloses a technique for solving the above problems, and an object thereof is to provide a purifying device and an ozone supply device that prevent the reverse flow of ozone.

The purification device disclosed in the present application is
In a purifying device for purifying the soil using a sparging well inserted into the soil,
An ozone generator that generates ozone,
And an ozone removing unit that removes the ozone that flows back when the ozone flows backward from the sparging well.
Further, the ozone supply device disclosed in the present application,
An ozone generator that generates ozone,
And an ozone removing unit for removing the ozone that has flowed back when the ozone flows back from the ozone generator.

According to the purification device and the ozone supply device disclosed in the present application,
It is possible to prevent back flow of ozone and prevent deterioration of the quality of the device.

FIG. 1 is a diagram showing a configuration of a purification device according to a first embodiment. It is a figure which shows the structure of the ozone generator of the purification apparatus shown in FIG. FIG. 6 is a diagram showing a configuration of another purification device according to the first embodiment. It is a figure which shows the structure of the purification apparatus by Embodiment 2. It is a figure which shows the structure of the adjustment part of the purification apparatus shown in FIG. It is a figure which shows the timing chart of the purification | cleaning method of the purification | cleaning apparatus shown in FIG. It is a figure which shows the structure of the purification | cleaning apparatus by Embodiment 3. It is a figure which shows the structure of the ozone supply apparatus by Embodiment 4.

Embodiment 1.
Hereinafter, embodiments of the present application will be described. First, the purpose of the present application will be described. In the soil pollution survey on the site of the factory, soil pollution by organic substances has become apparent. Examples of pollutants include organic chlorine compounds such as tetrachloroethylene (also known as PCE) and trichlorethylene (abbreviated as TCE), which are classified as volatile organic compounds (hereinafter referred to as “VOC”). As one of the methods for purifying these substances, there is an air sparging treatment in which air is diffused from a well installed underground into the soil.

  In the air sparging process, VOCs in the soil move into the bubbles by using the concentration gradient at the interface between the bubbles diffused in the soil and the soil as a driving force. The gasified VOC rises in the soil along with bubbles and is discharged to the ground. In this treatment method, the air bubbles diffused in the soil pass through the position where the soil easily flows, so that the entire contaminated region cannot be air-sparged. Therefore, only air sparging treatment leaves VOCs and the like in the soil in the contaminated region.

  Therefore, a method for in-situ purification of soil using ozonized oxygen (hereinafter referred to as "ozone") gas as a sparging gas diffused in the soil has been proposed. This treatment method is a soil purification method that uses the oxidizing power of ozone in addition to the removal of VOCs by air sparging. The ozone gas injected into the soil moves from the gas side to the liquid side into the soil due to the concentration gradient at the interface between the bubbles and the soil.

  Ozone decomposes and removes VOCs in-situ by permeating the soil as ozone water into the soil where bubbles hardly pass. All of the conventional purifiers using ozone gas promote the decomposition of dissolved ozone and generate radicals having a greater oxidizing power than ozone, thereby improving the decomposition rate of VOC.

  The purifying apparatus according to the embodiment of the present application is applied to a process for purifying in-situ pollution by pollutants such as VOC using ozone gas as a sparging gas in a gas sparging method. The gas sparging method refers to a purification method in which a pollutant (for example, a volatile organic substance) in the soil is volatilized by blowing gas into the soil, and the volatilized pollutant (organic substance) and gas are both collected.

  Therefore, when gas is injected into the soil, the pollutants that have volatilized and gasified are taken into the bubbles of the injected gas to form bubbles and rise in the soil. The air bubbles that have risen are sucked by installing a suction well, or the gas from the ground surface is sucked using a cover installed on the ground surface of the soil, and it is collected together with pollutants (volatile organic substances) as gas. To be done. The soil naturally includes groundwater contained in the soil.

  FIG. 1 is a diagram showing the configuration of the purification device according to the first embodiment. In the figure, a contaminated region 100 is a region in the soil in which the soil is contaminated by a contaminant (VOC or the like). The sparging well 1 (hereinafter referred to as the well 1) is the well 1 inserted in the contaminated region 100. The well 1 is composed of a pipe buried in the soil, and some soil may be present in the pipe. The pipe buried in the soil is made of, for example, ozone-resistant stainless steel, polyvinyl chloride, or a fluororesin material.

  On the lower end side of the well 1, a jet part 11 for supplying ozone gas into the soil is formed. The spouting portion 11 has holes or slits formed in the pipe of the well 1 at one or more locations. The well 1 is provided with a sealing member at the upper end of the well 1 so that ozone gas does not leak from the upper end of the well 1 to the outside air (atmosphere), and is maintained so as not to leak to the outside air (atmosphere). It This prevents ozone gas from leaking from the upper part of the well 1 into the outside air (atmosphere).

  A plurality of wells 1 may be installed in the contaminated region 100, but here, one well 1 will be described as an example. An ozone generator 2 is connected to the well 1. The ozone generator 2 is for supplying ozone gas to the well 1. A raw material gas unit 5 that supplies a raw material gas is connected to the ozone generator 2 through a pipe 50.

  The ozone generator 2 is supplied with oxygen gas as a raw material gas from the raw material gas section 5 through a pipe 50 to generate ozone gas. Specifically, the ozone generator 2 includes a pressure vessel 21 and a discharge electrode 22 installed in the pressure vessel 21, as shown in FIG. Then, oxygen gas is supplied into the pressure vessel 21 from the pipe 50 of the raw material gas part 5. Then, the discharge electrode 22 discharges to generate ozone gas, and the ozone gas is sent out from the first pipe 51. Therefore, while the ozone generator 2 is being driven, the pressure vessel 21 is filled with the generated ozone gas. In addition, in the ozone generator 2 of the present embodiment, oxygen gas is used as the raw material gas, but it is sufficient that the raw material gas at least partially contains oxygen, such as air, oxygen, and a rare gas. It is also possible to appropriately use a mixed gas with the above inert gas.

  Further, the purifying device includes an exhaust gas processing unit 130 that processes exhaust gas as an ozone removal unit that removes ozone that has flowed back when the ozone backflows from the well 1, and a gas that has been exhaust gas processed by the exhaust gas processing unit 130 to the atmosphere. A suction blower 110 that discharges into the inside and an adjusting unit 71 that adjusts whether ozone generated by the ozone generator 2 is sent to the well 1 or to the exhaust gas processing unit 130 are provided. The adjusting unit 71 is a part of an ozone removing unit that removes the ozone that has flowed back when the ozone has flowed back from the well 1. The ozone generator 2 and the adjustment unit 71 are connected by the first pipe 51. The adjustment unit 71 and the well 1 are connected by the second pipe 52. The adjustment unit 71 and the exhaust gas processing unit 130 are connected by a branch pipe 511.

  The adjustment unit 71 adjusts the second pipe 52 to an open state and the branch pipe 511 to a closed state, or the branch pipe 511 to an open state and the second pipe 52 to a closed state. Further, when the pipe pressure inside the first pipe 51 becomes higher than the pipe pressure inside the second pipe 52, the adjusting unit 71 closes the branch pipe 511 while keeping the second pipe 52 open and the first pipe 51. When the pipe pressure inside becomes lower than the pipe pressure inside the second pipe 52, the branch pipe 511 is opened and the second pipe 52 is adjusted to be closed. For example, the adjusting unit 71 is configured by an opening / closing valve whose opening / closing is controlled according to the pipe pressure difference between the pipes.

  The control unit 4 controls the ozone generator 2 and the suction blower 110. The control unit 4 and the ozone generator 2 are connected via the first signal line 81. The control unit 4 and the suction blower 110 are connected via the second signal line 86.

  The control unit 4 is composed of, for example, a personal computer. The control unit 4 transmits a start signal for starting the generation of ozone and a stop signal for stopping the generation of ozone to the ozone generator 2 through the first signal line 81. The control unit 4 controls the suction start timing of the suction blower 110 through the second signal line 86.

  Next, a purification method using the purification device of the first embodiment configured as described above will be described. The first embodiment has a step of supplying ozone gas into the soil. In this step, ozone gas is supplied to the contaminated region 100 from the ejection portion 11 below the well 1 via the first pipe 51 and the second pipe 52. Then, the ozone gas supplied into the soil is diffused into the soil to form bubbles, and rises in the soil in the contaminated region 100. Then, ozone is dissolved from the bubbles into the soil by using the concentration gradient between the bubbles and the gas-liquid interface as a driving force.

  Ozone dissolved in groundwater is consumed for reaction with pollutants (VOC, etc.) and oxidizable substances in soil, or for ozone self-decomposition. Ozone not consumed in these reactions is detected in the soil as dissolved ozone. Dissolved ozone detected in the soil permeates the soil and contributes to the decomposition of pollutants.

  In the process of supplying ozone gas to the well 1 in this way, the control unit 4 transmits a start signal for starting the generation of ozone to the ozone generator 2 via the first signal line 81. Then, the ozone generated by the ozone generator 2 flows from the first pipe 51 to the second pipe 52 via the adjusting unit 71. Immediately after the ozone generator 2 starts to generate ozone in this way, the pressure vessel 21 of the ozone generator 2 is not filled with ozone, and ozone is not being sent from the ozone generator 2. It may be small even if it is sent out. Therefore, there is a high possibility that the pipe pressure in the first pipe 51 is lower than the pipe pressure in the second pipe 52, and if the second pipe 52 is opened in this state, ozone will be generated in the ozone generator 2. There is a possibility of reflux.

  However, in the adjustment unit 71, when the pipe pressure in the first pipe 51 becomes lower than the pipe pressure in the second pipe 52, the branch pipe 511 is opened and the second pipe 52 is closed, so that the ozone is adjusted. Since the second pipe 52 is not opened in synchronization with the start of generation of ozone by the generator 2, the reverse flow of ozone to the ozone generator 2 as described above is prevented.

  When the pressure vessel 21 of the ozone generator 2 is sufficiently filled with ozone and a predetermined amount of ozone starts to be delivered from the ozone generator 2, the pipe pressure in the first pipe 51 is normally the second pipe. The pipe pressure becomes higher than the pipe pressure in 52, and the adjusting unit 71 adjusts the second pipe 52 to the open state and the branch pipe 511 to the closed state, and ozone is supplied to the well 1 through the second pipe 52.

  Even when the ozone generator 2 does not start generating ozone, if the pipe pressure in the first pipe 51 becomes lower than the pipe pressure in the second pipe 52 due to other factors, the branch pipe Since the adjustment is performed with 511 opened and the second pipe 52 closed, backflow of ozone to the ozone generator 2 is prevented. Further, when the pipe pressure in the first pipe 51 becomes lower than the pipe pressure in the second pipe 52, the branch pipe 511 is opened, so that even in the case where ozone remains, the exhaust gas treatment unit 130 Since the ozone flows in, it is discharged to the atmosphere by the suction blower 110 after the exhaust gas treatment is performed.

  Next, another example of the purifying device according to the first embodiment will be described with reference to FIG. In the figure, the same parts as in FIG. In FIG. 3, the installation position and the adjustment of the adjusting unit 72 as an ozone removing unit that removes the backflowing ozone when the backflowing ozone from the well 1 is different from the case described above. The adjustment unit 72 adjusts the flow rate of ozone gas sent to the exhaust gas processing unit 130. As an example, the second pipe 52 is always in an open state, and the adjustment unit 72 controls opening / closing of the branch pipe 511. The first pipe 51 and the second pipe 52 are provided with a branch portion T. The first pipe 51, the second pipe 52, and the branch pipe 511 are connected at a branch portion T. The adjusting section 72 is provided between the branch section T and the branch pipe 511.

  When the gas is flowing from the ozone generator 2 to the well 1, the adjusting unit 72 closes the branch pipe 511. On the other hand, when the flow of gas from the ozone generator 2 to the well 1 is stopped due to clogging of the ejection part 11, the branch pipe 511 is opened and ozone gas is allowed to flow from the ozone generator 2 to the exhaust gas processing part 130. Further, when the flow rate of the gas supplied from the ozone generator 2 is larger than the flow rate of the gas supplied to the well 1, the adjusting unit 72 supplies the gas flow rate supplied from the ozone generator 2 and the well 1. A flow rate of gas corresponding to the difference from the flow rate of the gas is passed through the branch pipe 511.

  In the conventional purifying apparatus, in the process of supplying ozone gas to the well 1, if the spouting part 11 is clogged with the soil and the metal oxides oxidized by ozone, the ozone gas sent from the ozone generator 2 will be ejected. Since it is not supplied to the soil from No. 11, ozone may flow back to the ozone generator 2.

  However, in the purifying apparatus of the first embodiment configured as shown in FIG. 3, the branch pipe 511 is opened when the flow of ozone gas toward the well 1 is reduced and stopped due to clogging of the ejection part 11 or the like, Since ozone gas flows from the ozone generator 2 to the exhaust gas processing unit 130, it is possible to prevent ozone from flowing back to the ozone generator 2 as described above.

  As the adjusting unit 72, for example, a pressure adjuster (pressure regulator) that automatically controls the opening degree of the valve according to the pressure of the first pipe 51 can be used. By using the pressure adjuster for the adjusting unit 72, the opening degree of the valve can be controlled without external control, the device configuration can be simplified, and the device cost can be reduced.

  Further, as the adjusting unit 72, for example, a pressure gauge and a flow rate adjusting valve (mass flow controller) provided in the second pipe 52 can be used. The flow rate of the ozone gas flowing to the branch pipe 511 can be controlled by controlling the opening degree of the flow rate adjusting valve according to the pipe pressure of the second pipe 52 measured by the pressure gauge. It is also possible to measure the gas flow rate of the second pipe 52 by using a flow meter instead of the pressure gauge and control the opening degree of the flow rate adjusting valve according to the gas flow rate of the second pipe 52. As described above, since the state of the well 1 can be measured near the well 1 by using the pressure gauge or the flow meter and the flow rate adjusting valve, the adjusting unit 72 can be controlled with high accuracy.

According to the purification device of the first embodiment configured as described above,
In a purifying device for purifying the soil using a sparging well inserted into the soil,
An ozone generator that generates ozone,
Since it is provided with an ozone removal unit that removes the ozone that has flowed back when the ozone flows back from the sparging well, it is possible to prevent the backflow of ozone to the ozone generator, so that the quality of the ozone generator, and thus the purification device, can be improved. Can be secured.

Further, the ozone removing unit, an exhaust gas processing unit for processing exhaust gas,
Since the adjustment unit that adjusts the flow rate of ozone sent to the exhaust gas processing unit is provided, it is possible to reliably prevent the backflow of ozone to the ozone generator, so that the quality of the ozone generator and thus the quality of the purification device can be secured. .

Further, the ozone removing unit, an exhaust gas processing unit for processing exhaust gas,
Since it is provided with an adjusting unit that adjusts whether ozone generated by the ozone generator is sent to the sparging well or is sent to the exhaust gas processing unit, it is possible to reliably generate a reverse flow of ozone to the ozone generator. Therefore, it is possible to ensure the quality of the ozone generator and eventually the purifying device.

Also, with a branch,
A first pipe connecting the ozone generator and the branch portion,
A second pipe connecting the branch portion and the sparging well,
A branch pipe connecting the branch part and the exhaust gas treatment part,
An adjusting unit provided between the branch unit and the branch pipe,
Since the adjustment unit adjusts the open / closed state of the branch pipe, the first pipe, the second pipe, and the branch pipe can reliably prevent the backflow of ozone to the ozone generator. The quality of the purification device can be secured.

Also, a first pipe connecting the ozone generator and the adjusting unit,
A second pipe connecting the adjusting portion and the sparging well,
A branch pipe connecting the adjusting unit and the exhaust gas treating unit is provided,
The adjusting unit performs the adjustment by setting the second pipe in the open state to close the branch pipe, or by setting the branch pipe in the open state and closing the second pipe.
The first pipe, the second pipe, and the branch pipe can reliably prevent the backflow of ozone to the ozone generator, so that the quality of the ozone generator and thus the purification device can be ensured.

Further, the adjusting unit, when the pipe pressure in the first pipe becomes higher than the pipe pressure in the second pipe, opens the second pipe and closes the branch pipe, and the first When the pipe pressure in the pipe becomes lower than the pipe pressure in the second pipe, the branch pipe is opened and the second pipe is adjusted in the closed state.
Regardless of the ozone generation of the ozone generator, the ozone flow path is adjusted by the adjustment unit, so that the backflow of ozone to the ozone generator can be prevented, and the quality of the ozone generator and eventually the purification device can be secured. .

The ozone generator includes a pressure container and a discharge electrode arranged in the pressure container,
Since the raw material gas introduced into the pressure vessel is discharged at the discharge electrode to generate ozone and sent out from the first pipe,
Since the back flow of ozone can be prevented from being generated in the pressure vessel, the quality of the ozone generator and thus the quality of the purification device can be secured.

Embodiment 2.
The second embodiment is provided with a mechanism for measuring the ozone gas concentration in the exhaust gas in the soil and controlling the ozone injection rate into the soil.

  FIG. 4 is a diagram showing the configuration of the purifying device according to the second embodiment. FIG. 5 is a diagram showing the configuration of the adjustment unit of the purification device shown in FIG. In the figure, the same parts as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted. As shown in FIG. 5, the adjusting unit 71 includes a valve 710, a first measuring unit 711, and a second measuring unit 712. The valve 710 is an opening / closing unit that opens / closes the second pipe 52 and opens / closes the branch pipe 511. The first measurement unit 711 measures the pipe pressure in the first pipe 51. The second measurement unit 712 measures the pipe pressure in the second pipe 52.

The adjusting unit 71 and the control unit 4 are connected by the third signal line 84.
The control unit 4 inputs the first measurement value of the first measurement unit 711 of the adjustment unit 71 and the second measurement value of the second measurement unit 712, respectively, and when the first measurement value becomes higher than the second measurement value, the valve When the second pipe 52 is opened and the branch pipe 511 is closed, and when the first measured value is lower than the second measured value, the branch pipe 511 is opened and the second pipe 52 is closed. The part 71 is controlled.

  When the valve 710 of the adjusting unit 71 is adjusted by opening the second pipe 52 and closing the branch pipe 511, the flow from the arrow Y1 of the first pipe 51 to the direction of the arrow Y2 of the second pipe 52. The road is secured. Further, when the valve 710 of the adjusting unit 71 is adjusted by opening the branch pipe 511 and closing the second pipe 52, the direction from the arrow Y1 of the first pipe 51 to the arrow Y3 of the branch pipe 511 is adjusted. A flow path is secured.

  In the second embodiment, the suction well 91 is provided as a suction unit that is inserted into the soil of the contaminated region 100 and that sucks the exhaust gas in the soil of the contaminated region 100. Here, the suction well 91 formed in the soil of the contaminated region 100 is shown as an example, but the suction well 91 is not limited to this, and as a suction unit for sucking gas in the soil of the contaminated region 100, for example, A cover may be installed on the ground surface around the well 1 on the contaminated area 100, and instead of the suction well 91, a suction unit for sucking gas in the soil of the contaminated area 100 may be provided, or both of them may be installed. It may be configured.

  The third pipe 142 is connected to the suction well 91. The ozone gas monitor 10 as a measurement unit is connected to the third pipe 142. The ozone gas monitor 10 is connected to the control unit 4 via the fourth signal line 85 and transmits the measurement result to the control unit 4. The ozone gas monitor 10 measures the ozone gas concentration in the sucked exhaust gas and sends the measurement result to the control unit 4. The suction blower 110 also functions as a suction unit for sucking gas from the suction well 91 via the third pipe 142.

The exhaust gas treatment unit 130 and the suction blower 110 are connected to the suction well 91.
The control unit 4 controls at least one of the ozone generator 2 and the suction blower 110 based on the ozone gas concentration measured by the ozone gas monitor 10.

  Next, a purification method of the purification device of the second embodiment configured as described above will be described. Since the ozone gas supply method is the same as that in the first embodiment, the description thereof is appropriately omitted. The timing of supplying and stopping the ozone gas will be described based on the example of the timing chart of FIG. First, FIG. 6 shows a series of operations of the purification method of the second embodiment as one cycle. Specifically, one cycle is divided into an arbitrary number of steps T. Here, in the case where one cycle is divided into two, it is a step T1 and a step T2, respectively, and is a diagram showing the timing of supplying and stopping ozone gas in the operation of each step. The timing chart shown in FIG. 6 is an example, and other examples are possible.

  In the purification method in FIG. 6, first, ozone gas is supplied into the soil in the T1 step. At the timing of starting the T1 process, the control unit 4 transmits a start signal for starting the generation of ozone to the ozone generator 2 via the first signal line 81. Further, the supply of ozone gas is stopped in the step T2. At the timing of starting the T2 process, the control unit 4 transmits a stop signal for stopping the generation of ozone to the ozone generator 2 via the first signal line 81.

  When ozone gas is injected into the soil in the contaminated region 100 from the well 1, ozone gas is diffused into the soil. The ozone gas injected into the soil becomes bubbles in the soil, moves in the soil, and reaches the soil surface in the soil. In the soil from the soil surface to the ground surface, the gas in the soil moves through the gaps between the soil particles. Then, the gas in the soil is sucked from the suction well 91 using the suction blower 110, and the gas injected into the soil is expelled to the ground. Then, the exhaust gas is introduced into the exhaust gas processing unit 130 via the suction well 91 and the third pipe 142. Then, the exhaust gas is subjected to exhaust gas processing by removing ozone, VOC, and the like in the exhaust gas processing unit 130. Then, the gas in the soil from which VOC and ozone have been removed and exhaust gas treatment has been performed is released to the atmosphere via the suction blower 110.

  The result of the ozone gas concentration measured by the ozone gas monitor 10 is transmitted to the control unit 4 via the fourth signal line 85. The control unit 4 transmits a signal to the ozone generator 2 and the suction blower 110 based on the acquired measurement result of the ozone gas concentration so that the ozone gas concentration becomes a predetermined value that is obtained in advance as a purification device, and the soil is discharged. The concentration of the ozone gas to be injected into the soil therein, the timing of switching the flow rate of the ozone gas, or the flow rate of the exhaust gas sucked in the suction well 91, that is, the suction blower 110 is controlled.

  The soil pressure around the suction well 91 may be changed by controlling the suction blower 110 and changing the flow rate of the gas sucked from the suction well 91. If the soil pressure around the suction well 91 is changed, it is possible to increase the chances of contact between the VOC and ozone in a place where ozone hardly penetrates, and increase the possibility of VOC decomposition and removal.

  Further, the control unit 4 inputs the first measurement value of the first measurement unit 711 of the adjustment unit 71 and the second measurement value of the second measurement unit 712 separately from the control of the generation and stop of ozone, and performs the first measurement. When the value is higher than the second measured value, the second pipe 52 is opened and the branch pipe 511 is closed, and when the first measured value is lower than the second measured value, the branch pipe 511 is opened. The adjustment part 71 is adjusted with the second pipe 52 closed. As described above, the control unit 4 does not control the adjustment unit 71 in synchronization with the start and stop of ozone generation of the ozone generator 2. Therefore, as in the first embodiment, ozone is prevented from flowing back to the ozone generator 2.

According to the purifying apparatus of the second embodiment configured as described above, it goes without saying that the same effects as those of the first embodiment can be obtained.
At the start time of starting the supply of ozone to the sparging well, a start signal for starting the generation of ozone is transmitted to the ozone generator, and at the stop time of stopping the supply of ozone to the sparging well, the ozone generation The device is equipped with a control unit that sends a stop signal to stop the generation of ozone, and in addition to the control that prevents the reverse flow of ozone to the ozone generation unit, the generation and stop of ozone can be controlled, improving the performance of the device. .

Further, in the purification device for sucking the exhaust gas in the soil using the suction unit for sucking the exhaust gas in the soil,
Since the exhaust gas treatment unit is connected to the suction unit and processes the exhaust gas sucked by the suction unit, the exhaust gas treatment of ozone generated from the ozone generation unit and the exhaust gas treatment from the soil can be combined. It is possible and efficiency is improved.

  In addition, in the purification apparatus of the present embodiment, the adjusting unit 71 and the suction well 91 are connected to the same exhaust gas processing unit 130, but a second exhaust gas processing unit is provided separately, and the adjusting unit 71 is the exhaust gas processing unit 130. In addition, the suction well 91 can be connected to the second exhaust gas processing unit. By providing the second exhaust gas treatment unit in this way, the specifications of each exhaust gas treatment unit can be changed according to the concentration and amount of ozone contained in the exhaust gas, and the apparatus cost and size can be optimized.

Embodiment 3.
In the third embodiment, an example in which a sustainer and a pressurized supplier are supplied in addition to ozone gas is shown. FIG. 7 is a diagram showing the configuration of the purification device according to the third embodiment. In the third embodiment, the "sustainer" that suppresses the self-decomposition of dissolved ozone in which ozone gas is dissolved in the soil is supplied into the soil together with the ozone gas used as the sparging gas described above. The sustainer is a substance that suppresses the self-decomposition of dissolved ozone in which ozone gas is dissolved in the soil and extends the half-life of the dissolved ozone concentration in the soil. The half-life of the dissolved ozone concentration is the time required to reduce the dissolved ozone concentration to half, and the longer the half-life of the dissolved ozone concentration, the longer the dissolved ozone in the soil.

  The ozone generator 2 is connected to a sustainer unit 3 that supplies a sustainer via a pipe 54. The sustainer section 3 is for supplying the well 1 with a sustainer together with ozone gas. The sustaining body part 3 shows an example in which carbon dioxide is used as the sustaining body.

  The supply unit 6 supplies a pressurized supply body different from ozone gas into the soil through the well 1. The supply unit 6 and the well 1 are connected by a fourth pipe 53. The pressurized supplier is a gas that is different from ozone gas, and is naturally a gas that does not promote the self-decomposition of ozone. Here, an example using pressurized air is shown. The pressurized feeder is fed into the soil in order to vary the soil pressure. By changing the soil pressure in this way, the movement of ozone in the soil can be promoted, and the purification of the soil by ozone is promoted.

  The supply unit 6 is composed of a blower or a compressor. Therefore, the supply unit 6 can adjust the supply amount of the compressed air by adjusting the output of the blower or the compressor. As a specific example, the ejection pressure of the pressurized air from the supply unit 6 may be 0.1 MPa to 1.5 MPa, preferably 0.15 MPa to 1 MPa, as an absolute pressure. If the air pressure is less than 0.1 MPa, it will be lower than the atmospheric pressure and cannot be efficiently supplied to groundwater. Further, when the air pressure is 1.5 MPa or more, the power consumption becomes large, the device becomes large, and the cost becomes high.

  The control unit 4 also controls the sustainer unit 3 and the supply unit 6. The control unit 4 and the sustaining unit 3 are connected via the fifth signal line 82. The control unit 4 and the supply unit 6 are connected via the sixth signal line 83. The control unit 4 starts the supply of the sustaining body to the sustaining body unit 3 through the fifth signal line 82 in synchronization with the start signal of the start of ozone generation and the stop signal of the stop of the generation of ozone. Send a stop signal to stop the signal and supply of the sustainer.

  Further, the control unit 4 transmits a start signal for starting the supply of the pressurized air and a stop signal for stopping the supply of the pressurized air to the supply unit 6 through the sixth signal line 83. Other controls of the control unit 4 are the same as those in each of the above-described embodiments.

  Next, a purification method using the purification device of the third embodiment configured as described above will be described. The third embodiment includes a step of supplying ozone gas and a sustainer into the soil and a step of supplying pressurized air into the soil. In the step of supplying the ozone gas and the sustaining agent, the ozone gas and the sustaining agent are supplied to the contaminated region 100 from the ejection portion 11 below the well 1 via the first pipe 51 and the second pipe 52. Then, the ozone gas and the sustaining agent supplied into the soil are diffused into the soil to form bubbles, and rise in the soil in the contaminated region 100. Then, ozone is dissolved from the bubbles into the soil by using the concentration gradient between the bubbles and the gas-liquid interface as a driving force.

  Dissolved ozone is consumed for reaction with pollutants (VOC and the like) and oxidizable substances in soil, or for ozone self-decomposition. Ozone not consumed in these reactions is detected in the soil as dissolved ozone. Dissolved ozone detected in the soil permeates the soil and contributes to the decomposition of pollutants. Furthermore, the sustainer can suppress the self-decomposition of dissolved ozone in soil. Therefore, ozone can reach a position apart from the position where ozone gas has passed in the soil. As a result, the decomposition and removal of contaminants in the contaminated area progresses.

  In the step of supplying the pressurized air, the pressurized air is supplied to the contaminated region 100 from the jet portion 11 below the well 1 via the fourth pipe 53. Then, the soil pressure in the soil is fluctuated to promote the movement of ozone gas and the sustainer in the soil.

  For example, in the first step, pressurized air is supplied into the soil, but ozone gas and a sustainer are not supplied (stop). In the next step, ozone gas and a sustainer are supplied to the soil, and pressurized air is not supplied (stop). Further, similarly to the second embodiment, the control unit 4 controls the open / closed state of the adjustment unit 71 in addition to such control.

According to the purifying apparatus of the third embodiment configured as described above, of course, the same effects as those of the above-described respective embodiments are achieved,
A supply unit that supplies a pressurized supply different from ozone to the sparging well,
A third pipe connecting the supply unit and the sparging well,
Since the third pipe is connected to the second pipe,
Even when the pressurized supply body is supplied, the back flow of ozone can be surely prevented from occurring, so that the quality of the ozone generator and eventually the purification device can be surely ensured.

Also, since the supply unit supplies pressurized air,
The cost of the purification device is low.

Further, the ozone generator is connected to a sustaining body portion that supplies a sustaining body that suppresses the decomposition of ozone, and the sparging well is supplied with the sustaining body together with ozone.
It suppresses the self-decomposition of ozone in the soil and improves the in-situ decomposition and removal of pollutants in the soil.

Fourth Embodiment
Although an example of the purifying device has been shown in each of the above-described embodiments, an example of the ozone supply device will be described in the fourth embodiment. FIG. 8 is a diagram showing the configuration of the ozone supply device according to the fourth embodiment. In the figure, the same parts as those in each of the above-described embodiments are designated by the same reference numerals and the description thereof is omitted.

  In each of the above-described embodiments, the example in which the well 1 in the soil is used as the supply target part for supplying ozone has been described. However, the supply target part 101, which is a part where ozone needs to be supplied, may be considered. The ozone generator 2 is provided with an ozone removing unit 131 that removes ozone when the ozone flows backward from the supply target unit 101. Therefore, it is possible to cope with the backflow of ozone to the ozone generator 2 as in the above embodiment.

According to the ozone supply device of the fourth embodiment configured as described above,
An ozone generator that generates ozone,
Since the ozone generator is provided with an ozone removing unit that removes the ozone that has flowed back when the ozone flows back from the ozone generator, it is possible to prevent the generation of the reverse flow of ozone to the ozone generator. Quality can be secured.

  Although the present disclosure describes various exemplary embodiments and examples, various features, aspects, and functions described in one or more of the embodiments are applicable to particular embodiments. However, the present invention is not limited to this, and can be applied to the embodiments alone or in various combinations. Therefore, innumerable variations not illustrated are envisioned within the scope of the technology disclosed herein. For example, it is assumed that at least one component is modified, added or omitted, and at least one component is extracted and combined with the components of other embodiments.

1 well, 10 ozone gas monitor, 100 contaminated area, 101 supplied area,
11 jetting section, 110 suction blower, 130 exhaust gas processing section, 131 ozone removing section,
142 third pipe, 2 ozone generator, 21 pressure vessel, 22 discharge electrode,
3 sustainer part, 4 control part, 5 raw material gas part, 6 supply part, 50 piping,
51 first pipe, 511 branch pipe, 52 second pipe, 53 fourth pipe, 54 pipe,
71 adjustment unit, 710 valve, 711 first measurement unit, 712 second measurement unit,
72 adjustment unit, 81 first signal line, 82 fifth signal line, 83 sixth signal line,
84 third signal line, 85 fourth signal line, 86 second signal line, 91 suction well,
T branch.

Claims (13)

In a purifying device for purifying the soil using a sparging well inserted into the soil,
An ozone generator that generates ozone,
An ozone removing unit that removes the ozone that has flowed back when the ozone flows back from the sparging well. The ozone removing unit is an exhaust gas processing unit that processes exhaust gas,
The purification device according to claim 1, further comprising an adjusting unit that adjusts a flow rate of ozone sent to the exhaust gas processing unit. The ozone removing unit is an exhaust gas processing unit that processes exhaust gas,
The purification device according to claim 1, further comprising: an adjustment unit that adjusts whether ozone generated by the ozone generator is sent to the sparging well or to the exhaust gas processing unit. Branching part,
A first pipe connecting the ozone generator and the branch portion,
A second pipe connecting the branch portion and the sparging well,
A branch pipe connecting the branch part and the exhaust gas treatment part,
An adjusting unit provided between the branch unit and the branch pipe,
The purification device according to claim 2, wherein the adjustment unit adjusts an open / closed state of the branch pipe. A first pipe connecting the ozone generator and the adjusting unit,
A second pipe connecting the adjusting portion and the sparging well,
A branch pipe connecting the adjusting unit and the exhaust gas treating unit is provided,
The purification device according to claim 3, wherein the adjustment unit performs adjustment by opening the second pipe and closing the branch pipe, or by opening the branch pipe and closing the second pipe. . When the pipe pressure in the first pipe becomes higher than the pipe pressure in the second pipe, the adjusting unit opens the second pipe and closes the branch pipe, and the inside of the first pipe. 6. The purifying apparatus according to claim 5, wherein when the pipe pressure of is lower than the pipe pressure in the second pipe, the branch pipe is opened and the second pipe is closed. At the start time of starting the supply of ozone to the sparging well, a start signal for starting the generation of ozone is transmitted to the ozone generator, and at the stop time of stopping the supply of ozone to the sparging well, the ozone generation The purification device according to any one of claims 4 to 6, further comprising a control unit that transmits a stop signal for stopping generation of ozone to the container. The ozone generator comprises a pressure vessel, and a discharge electrode arranged in the pressure vessel,
The purification apparatus according to any one of claims 4 to 7, wherein the raw material gas introduced into the pressure vessel is discharged at the discharge electrode to generate ozone and is sent out from the first pipe. In a purifying device that sucks exhaust gas in the soil using a suction unit that sucks exhaust gas into the soil,
The purification apparatus according to any one of claims 4 to 6, wherein the exhaust gas processing unit is connected to the suction unit and processes the exhaust gas sucked by the suction unit. A supply unit that supplies a pressurized supply different from ozone to the sparging well,
A third pipe connecting the supply unit and the sparging well,
The purification device according to any one of claims 4 to 9, wherein the third pipe is connected to the second pipe. The purification device according to claim 10, wherein the supply unit supplies pressurized air. 12. The ozone generator is connected to a sustainer unit that supplies a sustainer that suppresses the decomposition of ozone, and the sparging well is supplied with the sustainer together with ozone. The purifying device according to item 1. An ozone generator that generates ozone,
An ozone supply device comprising: an ozone removing unit that removes the ozone that has flowed back when the ozone flows back to the ozone generator.

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