JP2020065967A - Purifier and purification method - Google Patents

Abstract

To provide a purifier and a purification method, capable of preventing backward flow of ozone so as to secure quality of the purifier.SOLUTION: A purifier comprises an ozone generator 2 for generating ozone, a first pipe line 51 for introducing ozone generated by the ozone generator 2 into a well 1, a first control part 71 disposed between the ozone generator 2 and the well 1, which controls the opening/closing of the first pipe line 51, and a control part 4 which controls the first control part 71 to an open state when the pipe pressure on the ozone generator 2 side in the first pipe line 51 is equal to or more than the pipe pressure on the well 1 side, and controls the first control part 71 to a closed state when the pipe pressure on the ozone generator 2 side is less than the pipe pressure on the well 1 side.SELECTED DRAWING: Figure 1

Description

  The present application relates to a purification device and a purification method.

A conventional purification device is a purification gas supply device for supplying a purification gas containing ozone as a composition gas into the ground through a purification pipe penetrating into a hole drilled in the ground,
A water supply device for supplying water to the ground through the purification pipe,
The purifying gas is supplied so that the purifying gas is supplied by the purifying gas supply device and the water is supplied by the water supplying device. A control device for controlling the timing of supplying gas and water is provided (see, for example, Patent Document 1).

JP, 2008-272575, A

  The conventional purifying device supplies a gas containing ozone as a purifying gas by the purifying ozone supply device, but depending on the timing of supplying ozone, the ozone remaining in the pipe flows back to the purifying ozone supply device, There is a problem in that it causes the quality of the purification ozone supply device to deteriorate.

  The present application discloses a technique for solving the above problems, and an object thereof is to provide a purifying device and a purifying method for preventing backflow 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,
A first pipe for guiding the ozone generated by the ozone generator to the sparging well,
Located between the ozone generator and the sparging well, a first adjusting unit for adjusting the opening and closing of the first pipe,
When the pipe pressure on the ozone generator side in the first pipe is equal to or higher than the pipe pressure on the sparging well side, the first adjusting unit is opened, and the pipe pressure on the ozone generator side is the sparging well. And a control unit that controls the first adjusting unit to be in a closed state when the pipe pressure is less than the side pipe pressure.
Further, the purification method disclosed in the present application,
In a purification method for purifying the soil using a sparging well inserted into the soil,
An ozone generation step of generating ozone with an ozone generator,
Through a first pipe connected to the sparging well, an ozone supply step of guiding the ozone generated in the ozone generation step to the sparging well,
A first adjusting part is provided between the ozone generator and the sparging well to adjust the opening and closing of the first pipe, and the pipe pressure on the ozone generator side in the first pipe is on the sparging well side. When the pipe pressure is equal to or higher than the pipe pressure, the first adjusting unit is opened, and when the pipe pressure on the ozone generator side is less than the pipe pressure on the sparging well side, the first adjusting unit is closed. Be prepared.

According to the purification device and the purification method disclosed in the present application,
The back flow of ozone can be prevented and the quality of the device can be secured.

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 1st piping and the 2nd piping of the purification | cleaning apparatus shown in FIG. 3 is a flowchart of a purification method according to the first embodiment. It is a figure which shows the structure of the 1st adjustment part of the purification apparatus shown in FIG. It is a figure which shows the timing chart of the purification method of the purification apparatus shown in FIG. It is a figure which shows the other structure of the 1st piping and the 2nd piping of the purification apparatus shown in FIG. It is a figure which shows the structure of the purification apparatus by Embodiment 2.

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 in 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.

  In the embodiment of the present application, a "sustainer" that suppresses the self-decomposition of dissolved ozone 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.

  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 soil. The pipe buried in the soil is made of, for example, ozone resistant stainless steel, polyvinyl chloride, or fluororesin.

  On the lower end side of the well 1, an ejection part 11 for supplying ozone gas, a sustaining body and a pressurized supply body described later 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 and the sustainer do not leak from the upper end of the well 1 to the outside air (atmosphere), and the well 1 can be kept in a state of not leaking to the outside air (atmosphere). Is configured as follows. This prevents ozone gas and the sustainer 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 and a supply unit 6 are connected to the well 1. The ozone generator 2 is for supplying ozone gas to the well 1. The ozone generator 2 is connected to a source gas part 5 for supplying a source gas via a pipe 50 and a sustainer part 3 for supplying a sustainer via a pipe 52. Although the pipe 50 and the pipe 52 are separately connected to the ozone generator 2 for supply here, the present invention is not limited to this, and the pipe 50 and the pipe 52 are connected and joined. After that, the configuration may be such that it is connected to the ozone generator 2 to supply both the raw material gas and the sustainer. 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. As an example of the raw material gas supplied by the raw material gas unit 5, oxygen gas or an oxygen gas mixed with nitrogen gas may be used.

  The ozone generator 2 is supplied with oxygen gas as a raw material gas from the raw material gas portion 5 through a pipe 50 and carbon dioxide gas from the sustainer portion 3 to generate ozone gas. For example, the ozone generator 2 includes, for example, a pressure container and a discharge electrode installed in the pressure container. Then, oxygen gas is supplied into the pressure vessel from the pipe of the raw material gas part. Then, the discharge electrode discharges to generate ozone gas, and the ozone gas is delivered from the first pipe. Therefore, while the ozone generator is being driven, the pressure vessel is filled with the generated ozone gas.

  The supply unit 6 supplies a pressurized supply body different from ozone gas into the soil. 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.

  A first pipe 51 that guides ozone generated by the ozone generator 2 to the well 1 is installed. Further, a second pipe 53 that guides the pressurized air supplied from the supply unit 6 to the well 1 is installed. As shown in FIG. 2, the first pipe 51 and the second pipe 53 meet at a branch point M. The first pipe 51 is installed between the ozone generator 2 and the well 1 up to a branch point M branching to another location (here, a branch point M branching to the second pipe 53), A first adjusting unit 71 that adjusts the opening and closing of the first pipe 51 is installed. Therefore, the first adjusting unit 71 is located between the ozone generator 2 and the well 1 and adjusts the opening / closing of the first pipe 51.

  The second pipe 53 is installed from the supply unit 6 to the well 1 up to a branch point M branching to another location (here, a branch point M branching to the first pipe 51). A second adjustment unit 72 configured by, for example, a valve that adjusts the opening and closing of the two pipes 53 is installed. Therefore, the second adjusting unit 72 is located between the supply unit 6 and the well 1 and adjusts the opening / closing of the second pipe 53. As shown in FIG. 4, the first 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 first pipe 51. The first measurement unit 711 measures the pipe pressure in the first pipe 51 on the ozone generator 2 side of the valve 710. The second measuring unit 712 measures the pipe pressure in the first pipe 51 on the well 1 side of the valve 710. Usually, the fluid from the ozone generator 2 flows in the direction from the arrow Y1 to the arrow Y2.

  The control unit 4 controls the ozone generator 2, the sustainer unit 3, the supply unit 6, the first adjustment unit 71, and the second adjustment unit 72. The control unit 4 and the ozone generator 2 are connected via the first signal line 81. The control unit 4 and the supply unit 6 are connected via the second signal line 83. The control unit 4 and the sustaining unit 3 are connected via the third signal line 82. The control unit 4 and the first adjustment unit 71 are connected via the fourth signal line 84. The control unit 4 and the second adjustment unit 72 are connected via the fifth signal line 87.

  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 starts the supply of the sustaining body to the sustaining body unit 3 via the third signal line 82 in synchronization with the start signal for starting the generation of ozone and the stop signal for stopping the generation of ozone. Send a stop signal to stop the signal and supply of the sustainer.

  Further, the control unit 4 reduces the start signal for starting the supply of the pressurized air and the stop signal for stopping the supply of the pressurized air to the supply unit 6 by the second signal line 83, or the injection gas pressure of the pressurized air. To send a signal. When the pipe pressure on the ozone generator 2 side in the first pipe 51 is equal to or higher than the pipe pressure on the well 1 side, the control unit 4 opens the first adjusting unit 71 so that the pipe pressure on the ozone generator 2 side becomes higher. When the tube pressure on the well 1 side is less than the above, the first adjusting unit 71 is controlled to be closed.

  As an example of the control of the control unit 4, when the control unit 4 transmits a start signal for starting the generation of ozone to the ozone generator 2, the inside of the first pipe 51 of the first measurement unit 711 of the first adjustment unit 71. The first measured value of the pipe pressure and the second measured value of the pipe pressure in the first pipe 51 of the second measuring unit 712 are input, and the first measured value and the second measured value are the same or the first measured value. When the value becomes higher than the second measured value, the valve 710 is controlled from the closed state to the open state. The first measurement value of the first measurement unit 711 may substitute the value of the gas pressure measured on the ozone generator 2 side of the first adjustment unit 71.

  Next, a purification method using the purification device of the first embodiment configured as described above will be described. The first 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. 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.

  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. 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 ejection portion 11 at the bottom of the well 1 via the second pipe 53. Then, the soil pressure in the soil is fluctuated to promote the movement of ozone gas and the sustainer in the soil.

  Timings of supplying and stopping the ozone gas and the sustaining body and the pressurized air will be described based on an example of the timing chart of FIG. First, FIG. 5 shows a series of operations of the purification method of the first 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 T1 step and a T2 step, respectively, and is a diagram showing the supply and stop timings of the ozone gas, the sustaining body, and the pressurized air in the operation of each step. Note that the timing chart shown in FIG. 5 is an example, and other examples are conceivable, for example, when there is a stop time during which neither ozone gas, sustainer nor pressurized air is supplied.

  In the purification method in FIG. 5, first, in step T1, pressurized air is supplied into the soil, but ozone gas and a sustainer are not supplied (stopped). Next, in the T2 step, ozone gas and a sustaining agent are supplied to the soil, and pressurized air is not supplied (stop). The control of the open / closed state of the first adjusting unit 71 and the second adjusting unit 72 in such a case will be described. Before driving the purifying device, both the first adjusting unit 71 and the second adjusting unit 72 are closed.

  At the timing of starting the T1 process, the control unit 4 opens the second adjustment unit 72 via the fifth signal line 87. Then, the control unit 4 drives the supply unit 6 via the second signal line 83 to start the supply of pressurized air. At this time, the valve 710 of the first adjustment unit 71 maintains the closed state.

  Next, at the timing of starting the T2 process, the control unit 4 stops the supply unit 6 via the second signal line 83 to stop the supply of pressurized air or reduce the injection gas pressure. Then, as an ozone generation step (step ST1 in FIG. 3) of generating ozone, 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 start signal for starting the supply of the sustaining body is transmitted to the sustaining body part 3 via the third signal line 82.

  Further, when the pipe pressure on the ozone generator 2 side in the first pipe 51 is equal to or higher than the pipe pressure on the well 1 side, the first adjusting unit 71 is opened, or the pipe pressure on the ozone generator 2 side is set to the well 1 side. As a control step (step ST2 in FIG. 3) that closes the first adjusting unit 71 when the pressure is less than the pipe pressure on the side, the control unit 4 controls the first pipe 51 of the first measuring unit 711 of the first adjusting unit 71. The first measured value of the pipe pressure in the inside and the second measured value of the pipe pressure in the first pipe 51 of the second measuring unit 712 are input. Then, when the first measurement value and the second measurement value are the same or the first measurement value becomes higher than the second measurement value, the valve 710 of the first adjusting unit 71 is controlled from the closed state to the open state.

  After starting the supply of the raw material gas and the sustainer to the well 1, or at the same time, the control unit 4 closes the second adjustment unit 72 via the fifth signal line 87. After that, as an ozone supply step (step ST3 in FIG. 3) for guiding the ozone generated in the ozone generation step to the well through the first pipe 51, discharge of the ozone generator 2 is started to generate ozone, and ozone gas and ozone gas are generated. The sustainer is supplied to well 1.

  Since pressurized air is supplied in the T1 step, not only the second pipe 53 but also the first pipe 51 from the branch point M to the first adjusting unit 71 is filled with pressurized air. Therefore, even if the T1 process is completed and the process shifts to the T2 process, the pressurized air remains in the second pipe 53 and the first pipe 51 up to the first adjusting unit 71. When the valve 710 of the first adjusting unit 71 is opened with the pressurized air remaining, the pipe pressure in the first pipe 51 from the first adjusting unit 71 to the ozone generator 2 becomes the first adjusting unit. It is highly possible that the pressure is lower than the pipe pressure in the first pipe 51 from 71 to the well 1, and the pressurized air flows to the ozone generator 2 side in the direction opposite to the arrow Y1 and the arrow Y2 in FIG. It is conceivable that the ozone thus generated flows back to the ozone generator 2.

  Therefore, as described above, at the same time as the start signal of the start of ozone generation to the ozone generator 2, the valve 710 of the first adjusting unit 71 is not opened and the first measurement value and the second measurement value are set. Or the first measured value becomes higher than the second measured value, the valve 710 is controlled from the closed state to the open state. By controlling in this manner, it is possible to prevent ozone from flowing back to the ozone generator 2, and it is possible to prevent malfunction of the ozone generator 2. Further, since the second adjustment unit 72 is controlled to be closed when ozone is generated by the ozone generator 2, ozone can be prevented from flowing into the supply unit 6, and the performance of the supply unit 6 can be secured.

  Further, this phenomenon is not limited to the case where the first pipe 51 and the second pipe 53 join at the branch point M as shown in FIG. 2, and for example, as shown in FIG. The first pipe 51 and the second pipe 53 may be installed up to the well 1 without providing the branch point M. Even in this case, since the compressed air similarly flows into the first pipe 51 side in the well 1, the same effect can be obtained by performing the same purification method. However, since there is no branch point M, the first adjusting unit 71 is installed between the ozone generator 2 and the well 1 and the second adjusting unit 72 is installed at any position between the supply unit 6 and the well 1. It should have been done.

  In the first embodiment, the example in which the ozone gas and the sustainer are supplied at the same time has been described, but it is also possible to supply only the ozone gas.

  Further, although an example in which the pressurized air is supplied from the supply unit 6 has been shown, the present invention is not limited to this, and a case where only ozone gas is supplied from an ozone generator may be considered. In this case, for example, a process of supplying ozone gas and a process of not supplying (stopping) ozone gas, that is, a process of supplying nothing to the well are performed. Even in this case, at the time of starting the supply of ozone to the well, the start signal for starting the generation of ozone is transmitted to the ozone generator, and the first pipe in the ozone generator side from the first adjusting unit is sent. When the pipe pressure of is equal to or higher than the pipe pressure in the first pipe on the well side of the first adjusting unit, the first adjusting unit is controlled from the closed state to the open state. By doing so, it is possible to prevent the ozone from flowing back to the ozone generator not only by the pressurized air shown in the first embodiment but by other factors.

  The control unit opens the first adjusting unit when the pipe pressure on the ozone generator side in the first pipe is equal to or higher than the pipe pressure on the well side, and the pipe pressure on the ozone generator side is set to the well side. When the pressure is less than the pipe pressure, the example in which the first adjustment unit is controlled to be closed is shown, but the present invention is not limited to this, and the pipe pressure in the first pipe on the ozone generator side, which is specific to the purifier Is preset to a predetermined time that is equal to or higher than the pipe pressure in the first pipe on the well side, and the control unit closes the first adjustment unit after a predetermined time from the start time of starting the supply of ozone to the well. It is also possible to control from the open state.

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,
A first pipe for guiding the ozone generated by the ozone generator to the sparging well,
Located between the ozone generator and the sparging well, a first adjusting unit for adjusting the opening and closing of the first pipe,
When the pipe pressure on the ozone generator side in the first pipe is equal to or higher than the pipe pressure on the sparging well side, the first adjusting unit is opened, and the pipe pressure on the ozone generator side is the sparging well. When the pressure is less than the pipe pressure on the side, since it includes a control unit that performs control to close the first adjustment unit,
Since the backflow of ozone can be prevented, the quality of the ozone generator, and thus of the purifying device, can be ensured.

Further, the first adjusting unit, an opening and closing unit, a first measuring unit that measures the pipe pressure in the first pipe on the ozone generator side from the opening and closing unit, and the sparging well side from the opening and closing unit. Having a second measuring unit for measuring the pipe pressure in the first pipe,
The control unit controls the opening and closing of the opening and closing unit based on the measurement values of the first measurement unit and the second measurement unit,
Since the back flow of ozone can be surely prevented, the quality of the ozone generator and thus the purifying device can be surely ensured.

Further, the control unit controls the first adjusting unit from the closed state to the open state after a predetermined time from the start time point when the supply of ozone to the sparging well is started,
Since it is possible to easily prevent the backflow of ozone, it is possible to easily secure the quality of the ozone generator, and thus the purification device.

Further, since the ozone generator introduces a raw material gas to generate ozone and sends it out from the first pipe,
Since the backflow of ozone can be prevented, the quality of the ozone generator, and thus of the purifying device, can be ensured.

  Further, since the raw material gas uses oxygen gas or oxygen gas mixed with nitrogen gas, ozone can be reliably generated.

Further, a supply unit for supplying a pressurized supply different from ozone to the sparging well,
A second pipe that guides the pressure supply body supplied by the supply section to the sparging well,
Since it is provided between the supply unit and the sparging well and includes a second adjusting unit that adjusts the opening and closing of 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.

Further, since the control unit controls the second adjusting unit to be in a closed state when ozone is generated by the ozone generator,
Since it is possible to reliably prevent the back flow of ozone in the second adjusting unit, it is possible to ensure the quality of the second adjusting unit and eventually the purifying device.

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.

  Further, since carbon dioxide is used as the sustainer, ozone gas and carbon dioxide as the sustainer can be reliably supplied to the well.

Further, according to the purification method of the first embodiment as described above,
In a purification method for purifying the soil using a sparging well inserted into the soil,
An ozone generation step of generating ozone with an ozone generator,
Through a first pipe connected to the sparging well, an ozone supply step of guiding the ozone generated in the ozone generation step to the sparging well,
A first adjusting part is provided between the ozone generator and the sparging well to adjust the opening and closing of the first pipe, and the pipe pressure on the ozone generator side in the first pipe is on the sparging well side. When the pipe pressure is equal to or higher than the pipe pressure, the first adjusting unit is opened, and when the pipe pressure on the ozone generator side is less than the pipe pressure on the sparging well side, the first adjusting unit is closed. Because I'm prepared
Since the backflow of ozone can be prevented, the quality of the ozone generator, and thus of the purifying device, can be ensured.

Embodiment 2.
In the second embodiment, in addition to ozone gas, a sustaining body, and pressurized air, a mechanism for measuring the ozone gas concentration in the exhaust gas in the sucked soil and controlling the ozone injection rate into the soil and the like is provided. .

  FIG. 7 is a diagram showing the configuration of the purification device according to the second embodiment. 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. In this embodiment, a suction well 91 is inserted into the soil of the contaminated region 100 and serves as a suction unit for sucking 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 sixth signal line 85 and transmits the measurement result to the control unit 4. The suction blower 110 is connected to the control unit 4 via the seventh signal line 86 and is controlled by the control unit 4. Specifically, the control unit 4 controls the suction start timing of the suction blower 110 and the suction gas flow rate operation.

  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 is a blower as a suction unit for sucking gas from the suction well 91 via the third pipe 142, and further discharges the gas subjected to exhaust gas treatment by the exhaust gas treatment unit 130 to the atmosphere. The control unit 4 controls at least one of the ozone generator 2, the sustainer unit 3, the supply unit 6, 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 method of supplying the ozone gas, the sustaining body, and the pressurized air is the same as that in the first embodiment, the description thereof will be omitted as appropriate. 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 sixth signal line 85. Based on the acquired measurement result of the ozone gas concentration, the control unit 4 sets the ozone generator 2, the sustainer unit 3, the supply unit 6, and the ozone generator 2 so that the ozone gas concentration becomes a predetermined value that is obtained in advance as a purifying device. A signal is transmitted to at least one of the suction blowers 110, and the concentration of ozone gas to be injected into the soil in the soil, the flow rate of ozone gas, the injection amount of the sustaining agent, the timing of switching each process, or the exhaust gas sucked in the suction well 91. The flow rate, 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.

According to the purification apparatus of the second embodiment configured as described above, not only the same effects as those of the first embodiment can be obtained, but also in the soil by using the suction well inserted into the soil. In the purification device that sucks exhaust gas,
Since the exhaust gas processing unit for processing the exhaust gas connected to the suction well is provided,
Exhaust gas generated by purification of soil can be easily treated.

  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, 11 spout,
110 suction blower, 130 exhaust gas treatment section, 142 third pipe, 2 ozone generator,
3 sustainer section, 4 control section, 5 raw material gas section,
6 supply section, 50 piping, 51 first piping, 52 piping, 53 second piping,
71 1st adjustment part, 710 valve, 711 1st measurement part, 712 2nd measurement part,
72 second adjusting unit, 81 first signal line, 82 third signal line, 83 second signal line,
84 fourth signal line, 85 sixth signal line, 86 seventh signal line, 87 fifth signal line,
91 Suction well, M bifurcation.

Claims (11)

In a purifying device for purifying the soil using a sparging well inserted into the soil,
An ozone generator that generates ozone,
A first pipe for guiding the ozone generated by the ozone generator to the sparging well,
Located between the ozone generator and the sparging well, a first adjusting unit for adjusting the opening and closing of the first pipe,
When the pipe pressure on the ozone generator side in the first pipe is equal to or higher than the pipe pressure on the sparging well side, the first adjusting unit is opened, and the pipe pressure on the ozone generator side is the sparging well. And a control unit that controls the first adjustment unit to be closed when the pressure is less than the pipe pressure on the side. The first adjusting unit is an opening / closing unit, a first measuring unit for measuring a pipe pressure in the first pipe on the ozone generator side of the opening / closing unit, and a first measuring unit on the sparging well side of the opening / closing unit. Having a second measuring unit for measuring the pipe pressure in the pipe,
The purification device according to claim 1, wherein the control unit controls opening / closing of the opening / closing unit based on measurement values of the first measuring unit and the second measuring unit. The purification device according to claim 1, wherein the control unit controls the first adjusting unit from a closed state to an open state after a predetermined time has passed from a start time point when the supply of ozone to the sparging well is started. The said ozone generator generate | occur | produces ozone using oxygen gas or the oxygen gas which mixed nitrogen gas as a raw material gas, and sends it out from the said 1st piping to any one of Claim 1 to 3. Purification equipment. A supply unit that supplies a pressurized supply different from ozone to the sparging well,
A second pipe that guides the pressure supply body supplied by the supply section to the sparging well,
The purification device according to any one of claims 1 to 4, further comprising: a second adjusting unit that is located between the supply unit and the sparging well and that adjusts the opening and closing of the second pipe. The purification device according to claim 5, wherein the control unit controls the second adjustment unit to be in a closed state when ozone is generated by the ozone generator. The purification device according to claim 5 or 6, wherein the supply unit supplies pressurized air. In a purification device that sucks exhaust gas in the soil using a suction unit that sucks gas in the soil,
The purification device according to any one of claims 1 to 7, further comprising an exhaust gas processing unit that is connected to the suction unit and that processes the exhaust gas. 9. 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 purification device according to any one of items. The purification device according to claim 9, wherein the sustaining body uses carbon dioxide gas. In a purification method for purifying the soil using a sparging well inserted into the soil,
An ozone generation step of generating ozone with an ozone generator,
Through a first pipe connected to the sparging well, an ozone supply step of guiding the ozone generated in the ozone generation step to the sparging well,
A first adjusting portion is provided between the ozone generator and the sparging well to adjust the opening and closing of the first pipe, and the pipe pressure on the ozone generator side in the first pipe is on the sparging well side. When the pipe pressure is equal to or higher than the pipe pressure, the first adjustment unit is opened, and when the pipe pressure on the ozone generator side is less than the pipe pressure on the sparging well side, the first adjustment unit is closed. Purification method to prepare.

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