JP4421417B2 - Purification equipment for contaminated soil - Google Patents

Description

  The present invention relates to a purification treatment apparatus for separating oil or the like from contaminated soil containing oil or the like.

Contaminated soil containing oil or the like deteriorates the environment and cannot be reused as it is. For this reason, conventionally, various technologies for separating oil from contaminated soil and technologies for purifying the same have been proposed and implemented. For example, the causes of soil contamination with oil are natural oil spills, leaks from oil refineries, urban wastewater, industrial wastewater, etc. Recently, oil-contaminated soil at the former gas station as contaminated soil Is also attracting attention.
When oil or the like soaks into the soil, it penetrates or adheres to the gaps between the soil particles. The oil or the like that has infiltrated into the soil is adsorbed to the soil particles, dissolved in the ground water, or accumulated as a gas that has volatilized in the soil gap or as a liquid. Thus, oil etc. are contained in soil in various forms to form contaminated soil. Such oil-contaminated soil must be removed when the soil is reused for landfill. For this reason, conventionally, contaminated soil has been purified by various methods in order to remove other pollutants including oil.

Conventionally known methods include a soil gas suction method, a soil cleaning method, a heat treatment method, a solidification / stabilization / chemical treatment method, a biological treatment method, and the like. Among these treatment technologies, for example, as a technology for separating and purifying oil from contaminated soil containing oil that has been excavated and extracted to the surface, nutrients that promote the growth and activity of petroleum-degrading bacteria are mixed with the soil. A method for decomposing and removing oil in oil-contaminated soil by the action of petroleum-degrading bacteria by putting air into this is known (for example, Patent Document 1).
In addition, the soil contaminated with oil in the washing tank is washed, the oil layer floating in the washing tank is recovered and overflowed in the adjacent oil separation tank, and separated (for example, Patent Document 2), the soil contaminated with oil A method of adding water, mixing, stirring, slurrying, and separating (for example, Patent Documents 3, 4, and 5) is also known. Furthermore, as a method for purifying oil-contaminated soil by bioremediation (biological purification method), a “turning back method” that cuts the embankment with a heavy machine such as a backhoe or a “forced ventilation method” that ventilates by installing a pipe is known.

On the other hand, the same applicant is a technology related to the purification of contaminated water, but a vortex is generated by a jet flow generator to cause cavitation, and the contaminated water is introduced into the vortex and mixed and stirred, and the fine air particles of the jet The technique which purifies contaminated water is proposed (refer patent documents 6 and 7).
JP 2004-136224 A JP 2004-089793 A JP 2003-251330 A Japanese Patent Laid-Open No. 11-253923 JP 11-514405 A JP 2003-001241 A Japanese Patent Application Laid-Open No. 2004-105817.

  However, the biggest problem with the conventional method is that the equipment becomes enormous. In many cases, contaminated soil is stored and purified, and therefore, it is necessary to secure a large soil storage site, and the equipment for that purpose becomes large and is often fixedly installed as dedicated equipment. For this reason, the cost is high, and these processing methods are entrusted to a large-scale contractor who can afford a relatively large amount of funds. Further, even in the technology accompanying the removal of oil, not all of them can be surely removed completely. For example, even if it is mixed with water to form a slurry, it does not remove the oil from the soil and completely remove it for purification.

  Some oils that permeate and stick to the soil cannot be removed by normal agitation. In other words, there is a possibility that a case will inevitably be incomplete. The biological purification method is also a method that has been widely used as described above. However, in this case, it is necessary to leave the treatment for a certain period of time. In addition, the method of incineration requires incineration equipment and cannot be processed on site, and is too expensive as described above. Contaminated soil may contain not only oil but also various pollutants. For example, heavy metals are ideal, and it is ideal that these are devices that can be removed as easily as oil.

The present invention has been made based on such a technical background, and achieves the following object.
The objective of this invention is providing the purification processing apparatus of the contaminated soil which can be reliably purified in a short time.
Another object of the present invention is to provide a low-cost contaminated soil purification apparatus that has a simple configuration and does not require a large installation area.

The purification treatment apparatus for contaminated soil of the present invention 1
An apparatus for separating and purifying pollutants from contaminated soil,
A nozzle that injects high-pressure purified water;
A pump for supplying the high-pressure purified water;
A jet generating chamber of a jet generating box that has a partitioned flat space and receives the jet liquid of the high-pressure purified water from the nozzle and generates cavitation;
A soil supply port for forcibly supplying contaminated soil to the cavitation generation part provided on the wall surface of the jet generation chamber;
Ri Do and a discharge port for discharging the mixture of the high-pressure cleaning water and the contaminated soil that was stirred purified by the jet flow generating chamber is provided at one end of the jet flow generating chamber,
A soil supply device that can automatically supply contaminated soil to the soil supply port is provided.

The purification treatment apparatus for contaminated soil of the second aspect of the present invention is the first aspect of the present invention.
The contaminated soil is oil-contaminated soil, and the pollutant is oil.

In the present invention 1, the purification treatment apparatus for contaminated soil of the present invention 3,
The contaminated soil is heavy metal contaminated soil, and the pollutant is heavy metal.

The purification treatment apparatus for contaminated soil of the fourth aspect of the present invention is the first aspect of the present invention.
The jet generation chamber is flat in a three-dimensional space, the length of the space is L, the height of the space is H, the width of the space is W, and the effective diameter of the nozzle opening is When expressed by D1, the jet is jetted in the direction of the length L and in the direction of the centerline of the space, and the jet generation conditions are D1 <H and W / H> 4. And

The contaminated soil purification treatment apparatus of the present invention 5 is the present invention 1,
A second soil supply port for introducing the mixed liquid discharged from the discharge port, a second nozzle for injecting the high-pressure purified water, a second jet generating chamber for agitating and mixing air, and the second A second jet generation box comprising a second discharge port for discharging the second mixed liquid purified by stirring in the jet generation chamber is connected to the jet generation box.

The purification treatment apparatus for contaminated soil of the sixth aspect of the present invention is the fourth aspect of the present invention.
In the jet generation chamber, the shape of the corner where the width W and the length L intersect each other is an angle R shape.

The purification treatment apparatus for contaminated soil of the seventh aspect of the present invention is the fourth aspect of the present invention.
The jet generation chamber is characterized in that the shape of the corner where the width W and the length L intersect with each other has an arc shape centered on the center line.

The apparatus for purifying contaminated soil of the present invention can continuously purify contaminated soil by jets based on a jet generation box. In addition, with a simple configuration, it was possible to provide a contaminated soil purification treatment apparatus that can reliably perform purification treatment in a short time.
The device is a small device, can be transported and moved, does not require a lot of installation area, and can be separated using existing equipment for the separation process in the subsequent process, so the contaminated soil can be purified at a low cost. Became a device.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 and 2 are configuration diagrams showing the configuration of an embodiment of the contaminated soil purification treatment apparatus 1 of the present invention, FIG. 1 is a configuration diagram showing the purification treatment apparatus of the present invention, and FIG. It is the arrow view seen from the A direction.
In the present embodiment, the contaminated soil is described as oil-contaminated soil. In the treatment of oil-contaminated soil, it is necessary that the oil-contaminated soil is crushed to some extent and large stones are not mixed therein.

The high-pressure purified water is supplied through the pipe 4 by making the water in the water storage tank 2 into a high pressure by the pump 3. The high-pressure purified water is converted to high pressure by the pump 3 and supplied to the jet flow generation box 6 through the injection nozzle 5. A soil supply port 7 for contaminated soil is provided on the side wall of the jet generation box 6, and contaminated soil in a crushed state is continuously supplied from the soil supply port 7. This supply form is such that a hopper 8 is provided in the soil supply port 7 and is automatically and continuously supplied from the hopper 8 via a screw feeder 10 by driving a motor 9.
The position of the soil supply port 7 is provided at a position along the jet direction of the high-pressure purified water. In the present embodiment, the position is one near the wall surface in the width W direction in the vicinity of the jet nozzle 5. This soil supply port 7 is not limited to one place, and may be additionally provided near another wall surface in the width W direction, for example. Whether or not to add may be determined under the most suitable conditions in consideration of the amount of high-pressure purified water, the capacity of the jet generation box 6, and the like. This also applies to the amount of contaminated soil supplied by the screw feeder 10 or the like, and is set at the highest purification effect.

  In the jet generation box 6 that takes in these high-pressure purified water and contaminated soil, cavitation occurs in the jet generation chamber 6a, and purification is performed, and the mixture is discharged from the discharge port 12 as a purified liquid mixture. Since the discharged mixed liquid has already been in a state where the oil has been separated from the contaminated soil, separation and purification treatment that is generally performed may be performed after discharging.

  This separation and purification treatment is performed by a known means although details are not shown. In the present embodiment, as shown in FIG. 1, it is separated into non-contaminated soil, oil, non-contaminated water, and air via a separation device (system) 13. Non-contaminated soil is reused after drying. The oil is separated and disposed of by incineration. The non-contaminated water can be returned to the water storage tank 2 as washing water as shown by the piping path 14 in FIG. 1 and reused as high-pressure purified water again. Air should be detoxified and released into the atmosphere. In any case, a detoxification process that does not deteriorate the environment is performed.

Next, the jet generating box 6 which forms the main part of the present invention will be described. 4 and 5 are cross-sectional views schematically showing the principle of jet generation in the jet generation chamber 6a of the jet generation box 6. FIG. FIG. 4 is a cross-sectional view schematically showing the jet generation principle of the jet generation box, and FIG. 5 is a cross-sectional view of FIG. 4 taken along the line BB.
The jet generation box 6 is a flat rectangular box, and is arranged such that its longitudinal direction is vertical. An injection nozzle 5 that injects pressurized high-pressure purified water into the jet generation chamber 6 a is fixed to one surface of the jet generation box 6. The injection nozzle 5 is an annular space having a cylindrical cross section.
A partitioned jet generation chamber 6 a is formed inside the jet generation box 6. The internal space V of the jet generating chamber 6a is a flat, three-dimensional box-shaped space, and has a generally horizontal thickness H of the space, a general width W thereof, and a vertical length L thereof. Assuming that the effective diameter of the opening of the injection nozzle 5 is D1, the relationship is generally D1 <H, W / H> 4, and W <L. The main jet ejected from the ejection nozzle 5 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, the adhering vortex, which is a low-pressure vortex, is generated at the eight corners of the jet generating chamber 6a by the Coanda effect, and the adhering jet is generated in the main jet. Therefore, in the jet flow generation chamber 6a, the flow of the main jet is generated in either of the two directions (shown in the drawing) as shown in FIG. 4 or FIG. This main jet flow is not constant and stable, and moves in such a manner as to sway in a plane substantially in the width W direction.
That is, the main jet causes cavitation, is unstable and flows while shaking, and a vortex is generated. This is a characteristic point, and these main jets and jets such as attached vortices generate air with a very small particle size, as well as a mixture of purified water and contaminated soil, and a large number of air with very small particle sizes. Has the function of mixing and stirring uniformly. This liquid mixture is a mixture of high-pressure purified water and contaminated soil, and when in contact with air with a very small particle size, the small air particles dramatically increase the surface area (the surface area of the cube of the particle size). Therefore, the probability of contact with the mixed solution is increased, and the oil component and the like contained in the mixed solution is transferred to the gas phase so that the oil component is forcibly separated from the soil, and the contaminated soil is purified.

  There is also an oil component that does not shift to the gas phase but is taken into purified water as it is. Thus, purification is performed in a short time in the jet generation chamber 6a. The mixed liquid in which purified water and contaminated soil are mixed at the time of supply is discharged from the outlet 12 as a mixed liquid in which oil is taken into bubbles and purified. The condition for the generation of the Coanda effect in the jet generating chamber 6a may not be the dimensional condition described above. However, if the dimensional condition is set as described above, as shown in FIGS. This is preferable because the main jet is generated so as to sway in the direction.

  The block diagram shown in FIG. 1 is the purification processing apparatus 1 which applied the jet generation box 6 with such a function to purification of contaminated soil. If the separation device 13 for separating the discharged mixed liquid is included in the purification processing device 1, a purification system capable of performing the purification processing with a consistent configuration is constructed. As described above, the contaminated soil supplied to the soil supply port 7 is cleaned by the cavitation shock wave and the shear force of the vortex generated in the jet generation chamber 6a by the jet of high-pressure purified water jetted from the jet nozzle 5. That is, the oil is separated from the surface of the contaminated soil. The sucked air is refined by the vortex shearing force, and the refined bubbles attract oil. As a result, the non-contaminated soil from which the oil is removed and the liquid in which the oil and the fine bubbles are mixed are discharged. Discharged from. In the liquid mixture discharged from the discharge port 12, the fine bubbles and the oil are light, so the fine bubbles adsorb the oil and float on the water surface. Since the jet generation box 6 is a relatively small structure, it can be easily transported and installed at an appropriate position. This means that it can be processed at the site where contaminated soil is generated.

FIG. 3 is a block diagram showing a purification apparatus according to another embodiment of the present invention, and FIG. 6 is a cross-sectional view corresponding to FIG.
As shown in FIG. 3, the purification treatment apparatus 1 </ b> A of this embodiment is a purification treatment apparatus having a dual configuration by further adding a jet generation box 20. In the above-described embodiment, the contaminated soil is mixed and stirred in one jet generation box 6 to generate and purify fine bubbles. 3, the high-pressure purified water is supplied to the jet nozzle 5 through the pump 3 to the first jet generating box 6 as shown in the figure, and jetted in the jet generating chamber 6a. Contaminated soil is supplied to the soil supply port 7 through the screw feeder 10 in the jet generation box 6 as described above.
The mixed solution thus stirred and mixed is discharged from the discharge port 12, and the discharged mixed solution is guided to the soil supply port 21 of the second jet generation box 20. Further, high-pressure purified water is supplied to the injection nozzle 22 of the second jet generation box 20 via the pump 3. At this time, air is also supplied. As shown in FIG. 6, the jet nozzle 22 is a double pipe, purified water is supplied from an outer cylindrical pipe, and air is supplied from a central thin pipe.

In this air supply configuration, a supply hole may be provided in the jet flow generation box 20, and self-supply or forced suction may be performed from the hole. With such a supply configuration, the mixed liquid generated in the first jet generation box 6 is purified again by cavitation in the second jet generation chamber 20a of the second jet generation box 20. This purification is received by the injection from the second jet nozzle 22, and the mixed liquid is already in a liquid state, and thus is purified by the cavitation shock wave and the shear force of the vortex generated in the second jet generation chamber 20a.
By this purification, the oil is removed in a state of peeling from the surface of the contaminated soil, and as described above, the purified water is removed from the non-contaminated soil and the mixed water containing the separated oil from the second outlet 23 as air. It is discharged with. Since the adsorbed oil component floats from the water together with the fine bubbles, after this mixed solution is discharged, it is separated into oil component, water and non-contaminated soil, and the processing after the discharge can be performed smoothly.

In this embodiment, no air supply port is provided in the first jet generation box 6, but it is possible to provide an air supply port in the first jet generation box 6 as well. As compared with one jet generation box, the purification can be further promoted by processing with two jet generation boxes. With this configuration, even if contaminated soil that could not be purified in the first jet generation chamber 6a of the first station remains, it can be treated in the second jet generation chamber 20a, so that the degree of purification is increased. There is an advantage.
In the embodiment (see FIGS. 1 and 2) in which one jet generation box is provided, an air supply port for supplying air to the jet generation box 6 may be provided.

  FIG. 7 is a cross-sectional view showing the jet generating chamber 30a inside the jet generating box 30 having another structure. This form is a form in which a corner where the width W and the length L constituting the jet generating chamber 30a intersect each other has an R shape. Even in this case, the principle of generating a jet from the jet nozzle is not changed, but the Coanda effect is reduced. However, the effect of purifying the contaminated soil by generating cavitation in the jet generating chamber 30a remains the same. This does not change even in the case of the structure of the other jet generation chamber 40a shown in FIG. The form of FIG. 8 is a form in which the corner R of FIG. 7 is further increased in the jet generation chamber 40a inside the jet generation box 40, and the shape of the corner where the width W and the length L intersect is the same. It has an arc shape centered on the ejection direction center line. Although not shown in the drawing, the corner portion is the same as the R portion in the other corner portions.

  As described above, although other embodiments have been described, this purification is effective not only for oil-contaminated soil but also for contaminated soil containing heavy metals. In this case, the heavy metal is peeled and purified from the contaminated soil in the same manner as the oil, so that the discharged mixed liquid can be led to a cyclone type separation device in a subsequent process to separate the heavy metal. Moreover, since the specific gravity is different, it is possible to separate non-contaminated soil and heavy metal. Furthermore, it is also possible to mix the contaminated soil and gas in the first jet generation box without using a liquid, guide the dried mixture to the second generation box, and inject the purified water to perform the above purification. Is possible. Purification can be performed while changing the conditions depending on the form of the contaminated soil.

In this case, by controlling the equipment to be managed such as supply amount management, temperature management, pressure management, etc., the contaminated soil should be dried, granulated to the required size of the contaminated soil, and destroyed efficiently. Is also possible. In this way, various possibilities are provided for efficient purification. Further, it is possible to process in a multiple number instead of two.

FIG. 1 is a configuration diagram showing a purification treatment apparatus of the present invention. 2 is an arrow view of FIG. 1 as viewed from the A direction. FIG. 3 is a configuration diagram showing a purification processing apparatus according to another embodiment of the present invention. FIG. 4 is a cross-sectional view schematically showing the jet generation principle of the jet generation box. FIG. 5 is a cross-sectional view of FIG. 4 taken along line BB. FIG. 6 is a cross-sectional view corresponding to FIG. 5, and is a cross-sectional view of a form in which the nozzle has a double tube configuration. FIG. 7 is a cross-sectional view schematically showing the jet generation principle of the jet generation box of another embodiment, and is a cross-sectional view corresponding to FIG. FIG. 8 is a cross-sectional view schematically showing the jet generation principle of the jet generation box of another embodiment, and is a cross-sectional view corresponding to FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 1A ... Purification processing apparatus 2 ... Water storage tank 3 ... Pump 4 ... Piping 5, 22 ... Jet nozzle 6, 20, 30, 40 ... Jet generation box 6a, 20a, 30a, 40a ... Jet generation chamber 7, 21 ... Soil Supply port 12, 23 ... Discharge port

Claims (7)

An apparatus for separating and purifying pollutants from contaminated soil,
A nozzle that injects high-pressure purified water;
A pump for supplying the high-pressure purified water;
A jet generating chamber of a jet generating box that has a partitioned flat space and receives the jet liquid of the high-pressure purified water from the nozzle and generates cavitation;
A soil supply port for forcibly supplying contaminated soil to the cavitation generation part provided on the wall surface of the jet generation chamber;
Ri Do and a discharge port for discharging the mixture of the high-pressure cleaning water and the contaminated soil that was stirred purified by the jet flow generating chamber is provided at one end of the jet flow generating chamber,
A contaminated soil purification treatment apparatus, comprising a soil supply device capable of automatically supplying contaminated soil to the soil supply port. In the purification processing apparatus of the contaminated soil of Claim 1,
The apparatus for purifying contaminated soil, wherein the contaminated soil is oil-contaminated soil, and the contaminant is oil. In the purification processing apparatus of the contaminated soil of Claim 1,
The apparatus for purifying contaminated soil, wherein the contaminated soil is heavy metal-contaminated soil, and the contaminant is heavy metal. In the purification processing apparatus of the contaminated soil of Claim 1,
The jet generation chamber is flat in a three-dimensional space, the length of the space is L, the height of the space is H, the width of the space is W, and the effective diameter of the nozzle opening is When expressed by D1, the jet is jetted in the direction of the length L and in the direction of the center line of the space, and the jet generation conditions are D1 <H and W / H> 4. Purification equipment for contaminated soil. In the purification processing apparatus of the contaminated soil of Claim 1,
A second soil supply port for introducing the mixed liquid discharged from the discharge port, a second nozzle for injecting the high-pressure purified water, a second jet generating chamber for agitating and mixing air, and the second A contaminated soil purification treatment apparatus, characterized in that a second jet generation box composed of a second discharge port for discharging the second mixed liquid purified by stirring in the jet generation chamber is connected to the jet generation box. . In the purification processing apparatus of the contaminated soil of Claim 4,
In the jet flow generation chamber, the shape of the corner where the width W and the length L intersect with each other forms an angle R shape. In the purification processing apparatus of the contaminated soil of Claim 4,
The contaminated soil purification apparatus, wherein the jet generation chamber has an arc shape in which the shape of the corner where the width W and the length L intersect is centered on the center line.

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