JP3716226B2 - Volatile organic compound removal system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a volatile organic compound removal system for separating and removing volatile organic compounds contained in soil and groundwater. More specifically, the removal of volatile organic compounds related to the protection of human health, the substances contained in the soil environment pump up the water in the soil or the ground and separate and remove the substances contained in it. About the system.
[0002]
[Prior art]
Among substances used for industrial cleaning, solvents, etc., soil such as soil (in the civil engineering term A layer, B layer), groundwater pollutants such as dichloromethane, carbon tetrachloride, 1,2-dichloroethane, 1,1-dichloroethylene, cis-1,2-dichloroethylene, cis-1,2-dichloroethylene, 1,1,1-trichloroethane, 1,1,2-trichloroethane, trichloroethylene, tetrachloroethylene, 1,3-dichloropropane, benzene Volatile organic compounds such as are designated and known for soil environmental standards and groundwater environmental standards. Furthermore, six kinds of volatile organic compounds such as chloroform, trans-1,2-dichloroethylene, 1,2 dichloropropane, p-dichlorobenzene, toluene and xylene are added as monitoring items.
[0003]
It is said that most of these soil and groundwater contamination by volatile organic compounds is caused by volatile organic compounds entering the soil from or near the ground surface and penetrating into the ground to contaminate the soil and groundwater. ing. Volatile organic compounds that have flowed out of the pollution source penetrate into the ground in a liquid state, and a part of them stays in the soil gap. It is said that the undiluted solution reaching the aquifer descends in the aquifer when the gap between the formations is large and reaches an impermeable layer such as a clay layer, and stays near the groundwater surface when the gap is small.
[0004]
Various treatment techniques for removing and purifying volatile organic compounds in these soils have been proposed and implemented, such as the soil gas suction method, the double suction method, the gas-liquid mixed extraction method, and the soil excavation method. Yes. As groundwater treatment techniques, groundwater pumping methods, microbial treatment methods, and reactive barrier treatment methods have been proposed and implemented. In addition, off-gas containing volatile organic compounds separated from soil or groundwater is treated by an activated carbon adsorption method, a catalytic oxidation method, a thermal oxidation method, an ultraviolet oxidation method, or the like.
[0005]
In the double suction method described above, a well reaching the contaminated formation is dug and groundwater is pumped from the aquifer, and soil gas is also sucked separately for treatment. The gas-liquid mixed extraction method is a vacuum pump. Is a technology that simultaneously sucks soil gas and groundwater by high pressure reduction, and the groundwater pumping method is a method of pumping groundwater in which pollutants are dissolved. Pumped soil gas and contaminated water must be separated and removed from water and volatile organic compounds in some way.
[0006]
Among them, pumping aeration is known as a technique for separating and removing volatile organic compounds and low boiling point organic chlorine compounds from contaminated groundwater. When the pumped contaminated groundwater comes into contact with air at an aeration facility installed on the ground, highly volatile components contained in the contaminated groundwater are transferred to the gas phase and purified. For the treatment of the exhaust gas, methods such as adsorption treatment with activated carbon, thermal decomposition, and catalytic decomposition are applied.
[0007]
As typical examples of the pumped water aeration, a tower-like aeration tower, a tray type, and a method of aeration using a diffusion pipe in a storage tank are known. However, in these conventional aeration methods, the contact of air and contaminated water causes the contaminated water to fall from above and simultaneously to inject air from below. That is, the direction of the flow of the contaminated water and the air impregnated with the contaminated water is opposite and is often opposed.
[0008]
In this method, when the contamination concentration in the contaminated water is high and you want to increase the gas-liquid ratio (if you want to increase the amount of air), if you increase the amount of air, the contaminated water will be blown up by the air and it will be difficult to drop As a result, there is a problem that the processing amount decreases. As a result, there is a problem that the contact time of air and contaminated water must be lengthened, and the equipment becomes large and the processing energy increases.
[0009]
[Problems to be solved by the invention]
In the conventional aeration method, the present inventors have found that the air size, that is, the air particles (bubbles) are large when the contaminated water is aerated, and the gas-liquid mixing is weak, so the contact probability with the contaminated water is small. Pay attention. The focus is on enhancing the gas-liquid mixing while reducing and increasing the number of air particles in contact with the contaminated water. That is, it has been desired to increase the surface area of air per unit volume and enhance gas-liquid mixing without reducing the throughput.
The present invention has been made based on the technical background as described above, and achieves the following objects.
An object of the present invention is to provide a volatile organic compound removal system capable of improving the probability of contact between contaminated water and air and efficiently separating and removing volatile organic compounds from the contaminated water.
Another object of the present invention is to provide a volatile organic compound removal system that can efficiently separate and remove volatile organic compounds from polluted water with less removal energy.
Still another object of the present invention is to provide a volatile organic compound removal system capable of efficiently separating and removing volatile organic compounds from contaminated water with a system having a simple structure.
[0010]
[Means for Solving the Problems]
The present invention employs the following means in order to achieve the object.
The volatile organic compound removal system according to the first aspect of the present invention includes a nozzle (16) for pressurizing contaminated water and ejecting it substantially vertically upward, and for supplying air disposed in the nozzle (16). An air supply pipe (18), a pressure pump (11) for supplying the pressurized contaminated water to the nozzle (16), and a substantially partitioned space by sucking air together with the jet. A jet generation chamber (15) for forming a jet for stirring and mixing the contaminated water and the air, the jet generation chamber (15) with the contaminated water stirred and mixed, and In a volatile organic compound removal system comprising a discharge port (17) for discharging air containing the volatile organic compound separated from contaminated water,
The jet generation chamber (15) is connected in series in multiple stages, receives the gas-liquid mixture of the contaminated water and air discharged from the jet generation chamber (15), and separates the air and the contaminated water. And a gas-liquid separation box (29a-29c, 40) for returning air to the jet generation chamber (15) in the upper stage from the gas-liquid separation box (29a-29c, 40). .
[0011]
The volatile organic compound removal system according to the second aspect of the present invention includes a nozzle (16) for pressurizing contaminated water and ejecting it substantially vertically upward, and for supplying air disposed in the nozzle (16). An air supply pipe (18), a pressure pump (11) for supplying the pressurized contaminated water to the nozzle (16), and a substantially partitioned space by sucking air together with the jet. A jet generation chamber (15) for forming a jet for stirring and mixing the contaminated water and the air, the jet generation chamber (15) with the contaminated water stirred and mixed, and In a volatile organic compound removal system comprising a discharge port (17) for discharging air containing the volatile organic compound separated from contaminated water,
The jet generation chamber (15) is connected in series in multiple stages, receives the gas-liquid mixture of the contaminated water and air discharged from the jet generation chamber (15), and separates the air and the contaminated water. And a cyclone (45) for air flow, and air is returned from the cyclone (45) to the jet generation chamber (15) in the upper stage.
[0012]
When the contaminated water and the air are injected into the space (15) in the same direction, the supply amount of air may be freely adjusted. In order to generate the jet, any structure may be used as long as it has an internal space. However, the Coanda effect, which is a wall adhesion phenomenon in which the contaminated water adheres to the wall surface of the space (15), can be efficiently performed. What is generated is good.
[0013]
In order to effectively generate the Coanda effect, the space (15) is flat in a three-dimensional space, the approximate height of the space (15) is H, and the approximate width of the space (15). Is represented by W, and the effective diameter of the opening of the nozzle (16) is represented by D1, the jet is ejected in the direction of the length of the center line of the space (15), and the generation of the jet As conditions, it is preferable that D1 <H and W / H> 4.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
(Embodiment 1)
Embodiment 1 of the present invention will be described below with reference to the drawings. 1 and 2 are diagrams showing Embodiment 1 of a volatile organic compound removal system of the present invention. FIG. 1A is a plan view showing a volatile organic compound removal system, and FIG. 1B is a front view of FIG.
[0017]
[Blower 3]
The blower 3 mounted on the base 2 is a rotary blower of a type called a two-leaf type blower, and two two-leaf rotors (not shown) are mounted in the casing out of phase with each other. The air is pumped by rotating in the reverse direction via a gear. Since this type of blower has a known function and structure and is not the gist of the present invention, the structure and function will not be described in detail here.
[0018]
In addition, although the air blower used for this Embodiment 1 is a two-leaf rotor, if it can pressurize air, rotary air blowers other than this type may be sufficient. The blower 3 of this example generates an air pressure of a pressure of about 0.02 to 0.05 MPa with a gauge pressure.
[0019]
Air taken into the blower 3 is passed through a filter (not shown) to remove foreign matters such as dust. The two-leaf rotor of the blower 3 is driven to rotate by the electric motor 5. The electric motor 5 drives the rotor of the blower 3 through the pulley 6 of the output shaft, the V belt 7 and the pulley 8 of the blower 3. A silencer 9 having a cylindrical shape is disposed and fixed at the suction port of the blower 3 to reduce noise during operation. If a silencer (not shown) is also disposed at the discharge port 4, noise can be reduced.
[0020]
The air pressurized by the blower 3 exits from the discharge port 4 and enters the branching device 22. The pressurized air from the branching device 22 is branched and discharged from the four joint pipes 21 serving as a plurality of discharge ports. The air pressurized by the blower 3 is sent from the four joint pipes 21 to the respective jet generation boxes 14 as described later.
[0021]
[Pump 11]
The pump 11 is a pump for pressurizing contaminated ground water or the like. In this example, four pumps 11 are arranged in parallel. The pump 11 used in the first embodiment is of a spiral pump type. In the first embodiment, the contaminated water is pressurized at a gauge pressure of about 0.05 MPa. The pressurized contaminated water is injected into a jet generating chamber 15 described later together with the above-described pressurized air.
[0022]
[Jet generation box 14]
2 (a) and 2 (b) are diagrams showing the principle of the jet generation chamber, FIG. 2 (a) is a cross-sectional view cut at the front, and FIG. 2 (b) is a cross-section cut at the side. FIG. The jet generation box 14 has a flat rectangular box shape and is arranged such that its longitudinal direction is vertical. An injection nozzle 16 for injecting pressurized contaminated water downward is fixed to the lower surface of the jet flow generation box 14.
[0023]
The injection nozzle 16 is an annular space having a cylindrical cross section. A partitioned jet generating chamber 15 is formed inside the jet generating box 14. The internal space V of the jet generating chamber 15 is a flat three-dimensional box-like space, and has a horizontal thickness H of the space, a general width W, and a vertical (vertical) length. Is L, and the effective diameter of the opening of the injection nozzle 16 is D ₁ Then, in summary, D ₁ <H, W / H> 4 and W <L.
[0024]
The main jet ejected from the ejection nozzle 16 is ejected upward in the vertical direction in the direction of the approximate center line of the internal space V in the vertical direction. When the main jet is ejected, adhering eddies that are low-pressure eddies are generated at the eight corners of the jet generating chamber 15 due to the Coanda effect, and adhering jets are generated in the main jet. Accordingly, the main jet flow is generated in the jet flow generation chamber 15 in either one of the two directions (shown in the drawing) as shown in FIG. 2A or 2B.
[0025]
This main jet flow is not constant and stable, and the main jet flow moves in such a manner as to sway in a plane substantially in the width W direction. That is, the main jet is unstable and the flow is generated while shaking. These main jets, jets such as adhering vortexes generate air with a very small particle size, and have a function of uniformly mixing and stirring the contaminated water and a large number of air with very small particle sizes.
[0026]
When contaminated water comes into contact with air having a very small particle size, small air particles dramatically increase the surface area (surface area of the cube of the particle size), so the probability of contact with contaminated water increases. A highly volatile component contained in the contaminated water moves to the gas phase and is purified. Moreover, since the contaminated water and air are jetted in the same direction, it is easy to increase the amount of air, and when the amount of air is increased, there is an advantage that the flow rate is increased and the stirring effect is increased.
[0027]
Due to this action, dichloromethane, carbon tetrachloride, 1,2-dichloroethane, 1,1-dichloroethylene, cis-1,2-dichloroethylene, which are known volatile organic compounds that pollute groundwater and soil, Cis-1,2-dichloroethylene, 1,1,1-trichloroethane, 1,1,2-trichloroethane, trichloroethylene, tetrachloroethylene, 1,3-dichloropropane, benzene, chloroform, trans-1,2-dichloroethylene, 1,2 Dichloropropane, p-dichlorobenzene, toluene, xylene, etc. move to the gas phase.
[0028]
The Coanda effect of the jet flow generating chamber 15 may not be the dimensional condition described above, but preferably, if the dimensional condition described above is used, the inner space V may swing in either direction of the two jets as shown in the figure. The main jet is generated. An air supply pipe 18 is disposed and fixed at the center of the injection nozzle 16. Since the air supply pipe 18 is connected to the joint pipe 21 connected to the discharge port 4 of the blower 3, air is discharged from this port.
[0029]
The air supply pipe 18 is for drawing air by this negative pressure when contaminated water is discharged from the jet nozzle 16 to the jet flow generating chamber 15 and simultaneously drawing pressurized air from the blower 3. Therefore, the contaminated water pressurized by the pump 11 is sent to the injection nozzle 16 through the contaminated water supply pipe 12. Along with the contaminated water jetted from the jet nozzle 16, air pressurized by the blower 3 is supplied from the lower end of the air supply pipe 18.
[0030]
FIG.2 (c) is sectional drawing of the jet flow generation box which shows the example of the injection nozzle of another structure. The contaminated water pressurized by the pump 11 in the contaminated water supply pipe 12 is sent to the injection nozzle 16 through the contaminated water supply pipe 12. Along with the contaminated water jetted from the jet nozzle 16, air pressurized by the blower 3 is supplied from the lower end of the air supply pipe 18. In this structure, the action of sucking air from the air supply pipe 18 due to the negative pressure action of the contaminated water is small.
[0031]
3 (a), 3 (b), and 3 (c) show the above-described jet generation box 14 of the first embodiment. FIG. 3 (a) is a front sectional view, and FIG. b) is a right sectional view, and FIG. 3C is a bottom view. The upper end of the discharge pipe 17 is arranged in the vertical direction, and is continuously bent in the horizontal direction. The jet generation box 14 includes a box-shaped main body 20 in which a jet generation chamber 15 is formed. In order to increase the mechanical strength of the main body 20, reinforcing bands 19 are integrally fixed to the upper and lower ends and an intermediate position so as to wind the outer periphery of the main body by welding. The injection nozzle 16 shown in FIG. 3 has the structure shown in FIG.
[0032]
[Volatile organic compound recovery device 25]
In the jet generation box 14, components of highly volatile substances contained in the contaminated water are transferred to the gas phase. This highly volatile material must be recovered. Volatile organic compounds are recovered by the recovery device 25 (see FIG. 1). FIG. 4 shows four pumps 11 and four jet generation boxes 14 arranged in parallel on the base 2 as shown in FIG. 1, and is a development view showing the connection relationship between them.
[0033]
The four jet generation boxes 14 are fixedly arranged on each jet generation box support base 26. An injection nozzle 16, an air supply pipe 18, and the like are disposed in a lower space of the jet flow generation box support base 26. The contaminated water pressurized by the pump 11 is supplied to the injection nozzle 16 through the contaminated water supply pipe 12. One end of a discharge pipe 17 bent in an L shape is connected to the upper end of the jet generating box 14. The discharge pipe 27 flows in a state in which contaminated water and air containing components of the separated volatile organic compound are mixed in the jet generation chamber 15 in the jet generation box 14.
[0034]
The mixed air and contaminated water are discharged from the discharge port 28 of the discharge pipe 27. Air and contaminated water discharged from the discharge port 28 are discharged to the first-stage gas-liquid separation box 29a. The first-stage gas-liquid separation box 29a is for separating contaminated water and air containing volatile organic compounds. Air containing a volatile organic compound is adsorbed into an adsorption tank 37 packed with activated carbon through an opening 35 at the top of the first-stage gas-liquid separation box 29a through a pipe 36.
[0035]
Therefore, the volatile organic compound contained in the contaminated water is removed from the contaminated water together with air, and the volatile organic compound is reduced. The contaminated water in which the volatile organic compounds are reduced is stored in the lower part of the first stage gas-liquid separation box 29a. The contaminated water is again pressurized by the second pump 11 and sent to the second-stage jet generation box 14 by the same action as described above, and the volatile organic compounds are separated and removed. This reduction ratio is 1/5 to 1/20 or less at each stage as described later.
[0036]
Similarly, the contamination after the processing is completed in the four stages of the second-stage gas-liquid separation box 29b, the third-stage gas-liquid separation box 29c, the third-stage gas-liquid separation box 29c, and the final-stage gas-liquid separation box 40. As for the water, the finally treated contaminated water is rendered harmless to the environmental standard or less, and is flowed from the final stage gas-liquid separation box 40 to the public sewer through the discharge pipe 41.
[0037]
(Embodiment 2)
FIG. 5 is a diagram showing Embodiment 2 of the volatile organic compound removal system. In the first embodiment described above, the jet generation box 14 is connected in series and the contaminated water is treated in four stages. In the second embodiment shown in FIG. 5, the jet generation box 14 is connected in series to treat the contaminated water in three stages. This is a system for treating contaminated water with relatively little contamination.
[0038]
(Embodiment 3)
FIG. 6 is a development view showing Embodiment 3 of the volatile organic compound removal system. The volatile organic compound removal system shown in FIG. 6 is the same as Embodiment 1 described above in that the jet generation box 14 is connected in series to treat the contaminated water in four stages. The difference is that the air containing the volatile organic compound discharged from the third stage gas-liquid separation box 29c is returned to the air supply pipe 18 of the first stage jet generation box 14. Further, the air discharged from the final stage gas-liquid separation box 40 is returned to the air supply pipe 18 of the second stage jet generation box 14. In this way, when the exhaust air is returned to the upper stage, the amount of air consumed is small, and energy is saved.
[0039]
(Embodiment 4)
FIG. 7 is a development view showing Embodiment 4 of the volatile organic compound removal system. The volatile organic compound removal system shown in FIG. 7 is the same as in the first and third embodiments described above in that the jet generation box 14 is connected in series and the contaminated water is treated in four stages. The difference is that the air containing the volatile organic compound discharged from the second stage gas-liquid separation box 29b is returned to the air supply pipe 18 to the first stage jet generation box 14. Similarly, the air containing the volatile organic compound discharged from the third stage gas-liquid separation box 29c is returned to the air supply pipe 18 of the second stage jet generation box 14.
[0040]
Further, the air discharged from the final stage gas-liquid separation box 40 is returned to the air supply pipe 18 of the third stage jet generation box 14. The consumption of air is further smaller than that of the above-described third embodiment, which saves energy.
[0041]
(Embodiment 5)
FIG. 8 is a development view showing Embodiment 5 of the volatile organic compound removal system. The volatile organic compound removal system shown in FIG. 8 is the same as Embodiments 1 and 3 described above in that the jet generation box 14 is connected in series and the contaminated water is treated in four stages. However, air containing a volatile organic compound discharged from the third stage gas-liquid separation box 29c is used as the air supply pipe 18 of the first stage jet generation box 14 and the second stage jet generation box 14. It is different in returning to.
[0042]
Further difference is that the cyclone 45 is arranged in place of the final stage gas-liquid separation box in order to enhance the gas-liquid separation. The third-stage discharged liquid is introduced from the upper stage of the cyclone 45 into the cylindrical main body from the tangential direction. The gas containing the volatile organic compound separated by the cyclone 45 is returned from the upper gas outlet pipe 46 to the air supply pipe 18 of the third stage jet generating box 14.
[0043]
(Experimental example 1)
FIG. 9 is a table showing data obtained by experiments in the first and second embodiments. It can be seen that the concentration of the tetrachlorethylene contaminated water used in the experiment decreases to about 1/5 to 1/20 or less each time the jet generation box 14 is processed. FIG. 9 shows an experimental example of a conventional aeration system as a comparative example. In this example, the capacity of the aeration tower was about 1200L. On the other hand, in the test example of the present invention, the total volume of the jet generation chamber corresponding to the aeration tower is 76 L in the first embodiment (test No. 1 and 2) and 57 L in the second embodiment (test No. 3). .
Therefore, in the present invention, the capacity of the aeration chamber can be reduced to 1/16 to 1/21 compared to the conventional aeration tower system, and a significant space saving can be realized.
[0044]
[Other jet generation box 50]
The jet nozzle 16 of the jet generation box 14 described above is composed of a single contaminated water supply pipe 12 and an air supply pipe 18 (see FIG. 2). However, even if it is attempted to increase the amount of contaminated water, the structure of the jet generation box 14 and the injection nozzle 16 is limited, and the jet generation box 14 must be arranged in parallel.
[0045]
FIG. 10 is a cross-sectional view showing a sixth embodiment of the jet flow generation box 50 and the injection nozzle 66. This jet generation box 50 is a flat box shape similar to that shown in FIG. 2, and is usually used with its longitudinal direction being vertical. The jet generation chamber 65 partitioned inside the jet generation box 50 is a space paralleling the internal space V of the embodiment shown in FIG.
[0046]
However, the internal space V of the jet generating chamber 65 shown in FIG. 10 has a substantially horizontal thickness H of the space, a general width W thereof, a vertical (vertical) direction length L, and an injection nozzle. The effective diameter of 16 openings is D ₁ Then, the outline is the same as in the above-described embodiment. ₁ <H, W / H> 4 and W ≦ L. An injection nozzle 66 for injecting pressurized contaminated water downward is fixedly disposed on the lower surface of the jet flow generation box 14.
[0047]
The input side of the injection nozzle 66 is composed of an air supply pipe 68 and a contaminated water supply pipe 62 having two cylindrical sections arranged so that their central axes are parallel to each other. The pressurized contaminated water supplied from one contaminated water supply pipe 62 and the pressurized air supplied from the two air supply pipes 68 are mixed at the confluence 51, and the two on the jet generation chamber 65 side are mixed. It discharges at the jet nozzle 52.
[0048]
The two jets discharged from the jet nozzle 52 of the jet nozzle 66 are jetted vertically upward in the direction of the approximate center line of the internal space V in the vertical direction, and as shown by the imaginary line in FIG. Configure the jet. This main jet becomes a substantially circular vortex. Similar to the jet generating box 14 (see FIG. 2) of the above-described embodiment, the adhering vortex, which is a low pressure vortex, is generated at the eight corners of the jet generating chamber 65 due to the Coanda effect, and the adhering jet is generated in the main jet. A stirring effect occurs.
[0049]
Further, this main jet is not constant and stable, like the jet generation box 14 of the above-described embodiment, and the main jet is unstable and generates a flow while shaking. These main jets, jets such as adhering vortexes generate air with a very small particle size, and have a function of uniformly mixing and stirring the contaminated water and a large number of air with very small particle sizes.
[0050]
Three discharge pipes 67 for discharging a mixture of contaminated water and air are arranged on the upper surface of the jet generating box 50. The discharge pipe 67 discharges the contaminated water and air that are uniformly mixed and stirred.
[0051]
(Experimental example 2)
FIG. 11 is a table showing data obtained by experimenting with the other jet generating box 50 described above. Similar to Experimental Example 1 described above, even if the capacity of the jet generating chamber 65 of the jet generating box 50 is increased and the treatment amount is increased, the concentration of tetrachlorethylene contaminated water used in the experiment is processed by the jet generating box 50. It can be seen that the rate is reduced to about 1/5 to 1/20 or less.
[0052]
(Other embodiments)
In the volatile organic compound removal system, the jet generation box 14 is connected in series and the contaminated water is treated in three to four stages. Processing may be performed in stages. In the system, the volatile organic compound is adsorbed by activated carbon. However, it may be treated by other methods such as decomposition by a catalyst, thermal decomposition, decomposition by discharge.
[0053]
【The invention's effect】
As described above in detail, the method and system for removing volatile organic compounds of the present invention can efficiently remove volatile organic compounds from contaminated water with a simple structure and less energy.
[Brief description of the drawings]
FIG. 1 (a) is a plan view showing a volatile organic compound removal system according to Embodiment 1, and FIG. 1 (b) is a front view of FIG. 1 (a).
2A and 2B are diagrams showing the principle of a jet generation chamber, FIG. 2A is a cross-sectional view cut along the front, and FIG. b) is a cross-sectional view cut along a side surface. FIG.2 (c) is sectional drawing of the jet flow generation box which shows the example of the injection nozzle of another structure.
FIGS. 3 (a), 3 (b), and 3 (c) show the above-described jet generation box of the first embodiment, and FIG. 3 (a) is a front sectional view; FIG. 3B is a right sectional view, and FIG. 3C is a bottom view.
4 is a developed view showing a connection relationship between four pumps and four jet generation boxes, which is a volatile organic compound removal system of Embodiment 1. FIG.
FIG. 5 is a development view showing a second embodiment of a volatile organic compound removal system.
FIG. 6 is a development view showing a third embodiment of the volatile organic compound removal system.
FIG. 7 is a development view showing a fourth embodiment of a volatile organic compound removal system.
FIG. 8 is a development view showing a fifth embodiment of the volatile organic compound removal system.
FIG. 9 is a table showing data obtained by experiments in the first and second embodiments.
FIG. 10 is a cross-sectional view showing a sixth embodiment of a jet generating box and an injection nozzle.
FIG. 11 is a table showing data obtained by experimenting with another jet generating box.
[Explanation of symbols]
2 ... stand
3 ... Blower
4 ... Discharge port
11 ... Pump
15 ... Jet generation room
14 ... Jet generation box
16 ... injection nozzle
18 ... Air supply pipe
29 ... Gas-liquid separation box
40 ... Terminal gas-liquid separator
45 ... Cyclone

Claims (5)

A nozzle (16) for pressurizing contaminated water and ejecting it substantially vertically upward;
An air supply pipe (18) disposed in the nozzle (16) for supplying air;
A pressure pump (11) for supplying the contaminated water pressurized to the nozzle (16);
A jet generating chamber (15) for forming a jet for agitating and mixing the contaminated water and the air, comprising a substantially partitioned space by sucking air together with the jet;
The jet generation chamber (15) has a volatile property comprising the contaminated water that has been stirred and mixed, and a discharge port (17) for discharging air containing the volatile organic compound separated from the contaminated water. In organic compound removal system,
The jet generation chamber (15) is connected in series in multiple stages,
A gas-liquid separation box (29a-29c, 40) for receiving the gas-liquid mixture of the contaminated water and air discharged from the jet generating chamber (15) and separating the air and the contaminated water;
A system for removing volatile organic compounds, wherein air is returned from the gas-liquid separation box (29a-29c, 40) to the jet generation chamber (15) in the upper stage. A nozzle (16) for pressurizing contaminated water and ejecting it substantially vertically upward;
An air supply pipe (18) disposed in the nozzle (16) for supplying air;
A pressure pump (11) for supplying the contaminated water pressurized to the nozzle (16);
A jet generating chamber (15) for forming a jet for agitating and mixing the contaminated water and the air, comprising a substantially partitioned space by sucking air together with the jet;
The jet generation chamber (15) has a volatile property comprising the contaminated water that has been stirred and mixed, and a discharge port (17) for discharging air containing the volatile organic compound separated from the contaminated water. In organic compound removal system,
The jet generation chamber (15) is connected in series in multiple stages,
A cyclone (45) for receiving the gas-liquid mixture of the contaminated water and air discharged from the jet generation chamber (15) and separating the air and the contaminated water;
A system for removing volatile organic compounds, characterized in that air is returned from the cyclone (45) to the upper jet generation chamber (15). In the removal system of the volatile organic compound according to claim 1 or 2 ,
A volatile organic compound removal system comprising a blower (3) for supplying pressurized air to the air supply pipe (18). In the removal system of the volatile organic compound according to claim 1 or 2 ,
The system for removing volatile organic compounds, wherein the air supply pipe (18) is disposed coaxially with the nozzle (16). In the removal system of the volatile organic compound according to claim 1 or 2 ,
The jet generation chamber (15) for generating the jet is flat in a three-dimensional space, the approximate height of the space is represented by H, the approximate width of the space is represented by W, and the nozzle (11) When the effective diameter of the opening is represented by D1, the jet is jetted in the direction of the length and in the direction of the center line of the space. The conditions for generating the jet are as follows: D1 <H and W / H> 4 A system for removing volatile organic compounds, comprising:

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