JP2002224656A - Treatment method and treatment equipment for contaminated soil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a treatment method and treatment equipment for contaminated soil capable of making efficient treatment in the treatment of the contaminated soil using UV rays. SOLUTION: The treatment equipment 100 for the contaminated soil comprises the step of mixing photocatalyst particles 2 with the contaminated soil 1 to be treated and moving the soil to be treated in the state of imparting vibrations to the soil to be treated while irradiating the soil to be treated with the UV rays. The photocatalyst particles 2 desirably have the specific gravity smaller than the specific gravity of the soil 1 to be treated. The treatment equipment for the contaminated soil has a catalyst adder 20 for adding the photocatalyst particles to the contaminated soil 1 to be treated, a vibration transporter 30 for moving the soil to be treated while imparting the vibrations thereto and a UV feeder 40 for irradiating the soil 1 to be treated which moves on a conveyance section 32 of the vibration transporter 30 with the UV rays.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for treating soil contaminated with harmful substances such as crude oil, petroleum, and organic chlorine compounds, and a treatment apparatus used for the method.

[0002]

BACKGROUND OF THE INVENTION Crude oil,
Soil pollution by harmful substances such as petroleum and organochlorine compounds has become one of the environmental problems. Methods for removing or decomposing such soil harmful substances are roughly classified into a biological treatment method called bioremediation and a physicochemical treatment method. As the physicochemical treatment method, methods such as heat extraction, solvent extraction, washing, irradiation of ultraviolet rays, and chemical treatment using an oxidizing / reducing agent are known. When purifying contaminated soil containing a hardly decomposable substance, it is difficult to purify only by applying a biological treatment method.Therefore, it is preferable to use both a physicochemical treatment method and a biological treatment method. Are known.

[0003] As a treatment method using physicochemical treatment of irradiating contaminated soil with ultraviolet rays, for example, there is a technique disclosed in Japanese Patent Application Laid-Open No. 9-239352. In this technique, a method is used in which a contaminant is sprayed onto contaminated soil and irradiated with ultraviolet light while stirring. In such a physicochemical treatment method using ultraviolet light, since the decomposition action by ultraviolet light occurs only on the irradiated surface, it is difficult to obtain high decomposition efficiency only by stirring the contaminated soil. In addition, this method is applied only to the surface layer of contaminated soil, and the treatment area is limited.

Accordingly, an object of the present invention is to provide a method and an apparatus for treating contaminated soil capable of performing an efficient treatment in physicochemical treatment of contaminated soil using ultraviolet rays.

[0005]

The method for treating contaminated soil according to the present invention comprises mixing a contaminated soil with a reaction accelerator and irradiating the soil with ultraviolet rays with the mixture. And moving the same while applying vibration.

According to the treatment method of the present invention, by applying vibration to the soil to be treated, the soil particles move up and down, and the surface of the soil to be treated fluctuates. For this reason, a state in which new soil always appears on the surface of the soil to which the ultraviolet light is irradiated, and the decomposition action by the ultraviolet light is efficiently performed. In addition, by applying vibration to the soil to be treated, the vertical movement range of the soil to be treated can be more accurately defined as compared with a simple mechanical stirring using a rotating member such as a rotor. As a result, the irradiation distance of the ultraviolet light irradiated to the soil to be treated can be more strictly defined, and the action of decomposing the ultraviolet light can be enhanced. The ultraviolet light preferably has peaks at wavelengths of 254 nm and 185 nm. Ultraviolet rays having wavelengths of 254 nm and 185 nm contribute to decomposition of pollutants, and ultraviolet rays having a wavelength of 185 nm also contribute to generation of ozone having a purifying action.

[0007] In the present invention, since the reaction accelerator is mixed with the soil to be treated, the decomposition of pollutants by ultraviolet rays can be further enhanced.

It is preferable that the reaction accelerator contains at least a photocatalyst. When the reaction accelerator contains a photocatalyst, the decomposition of contaminants by ultraviolet rays can be dramatically increased. Preferably, the photocatalyst is a photocatalyst particle. Since the photocatalyst is in the form of particles, the photocatalyst particles float on or near the surface of the soil to be treated due to the vibration of the soil to be treated. As a result, since the photocatalyst particles and the ultraviolet light coexist on the surface of the soil to be treated, the action of decomposing the ultraviolet light by the photocatalyst can be more effectively enhanced.

The photocatalyst particles have a smaller unit volume weight than the soil to be treated, so that the above-mentioned effects can be more reliably achieved. Here, “particulate” means
The shape is not particularly limited, such as a spherical shape, a shape having a space such as a polygon, an irregular shape, and a donut shape.

The photocatalyst particles need only have a photocatalyst at least on the surface of the particles, and the structure is not particularly limited. However, in order to reduce the unit volume weight of the photocatalyst particles, it is desirable to have a structure in which the photocatalyst is supported on a carrier. That is, by using a substance having a small specific gravity or a small unit volume weight as the carrier, the unit volume weight of the photocatalyst particles can be reduced. As the photocatalyst, for example, titanium oxide or the like can be used.

As the carrier, a carrier having a porous structure or a surface having irregularities can be used. When the carrier has such a structure, the area where the photocatalyst is supported can be increased. As a result, the contact area between the photocatalyst and the soil to be treated can be increased, and the action of the photocatalyst can be enhanced. Further, in the case where biological treatment is performed as a secondary treatment described later, a space and environment where microorganisms can easily inhabit can be created by using a porous or carrier having unevenness on the surface.

As the carrier having a porous or uneven surface, wood materials such as activated carbon and cork, and inorganic materials such as pumice and brick can be used. Further, as the carrier, an inorganic substance such as ceramics or an organic substance such as plastic or resin can be used. These inorganic or organic substances may be used to constitute the above-described carrier having a porous or uneven structure.

Further, the carrier may be made of a magnetic material such as iron. In this way, by using a carrier having magnetism, the photocatalyst particles can be recovered as described later.

The treatment method of the present invention may include a step of recovering the photocatalyst particles from the treated soil after the treatment. The collected photocatalyst particles can be reused.

The treatment method of the present invention may further include a secondary treatment step by at least one of a physicochemical treatment and a biological treatment, if necessary. The contaminants can be further purified by using the secondary treatment together. Then, after the secondary treatment, the reaction accelerator can be recovered from the treated soil.

The apparatus for treating contaminated soil according to the present invention comprises: an adding means for adding a reaction accelerator to the contaminated soil to be treated; a conveying means for moving the contaminated soil in a state where the soil is vibrated; An ultraviolet ray supply means for irradiating ultraviolet rays to the soil to be treated moved by the transport means.

According to this treatment apparatus, the above-described method for treating contaminated soil can be performed. As described above, the reaction accelerator desirably includes various types of photocatalyst particles.

It is preferable that the conveying means is a vibrating conveying device which can move the soil in a predetermined direction while mixing the soil by applying vibration to the soil to be treated. This vibrating conveyance device can move the contaminated soil without moving the conveyance surface itself in the conveyance direction by applying a predetermined vibration to the conveyance surface of the contaminated soil. Note that the transporting means is not limited to this type, and the vibrating means and the moving means may be provided separately.

Further, the processing apparatus according to the present invention can take various aspects as follows.

(A) A supply amount control means for supplying a predetermined amount of the soil to be treated to the transport means may be provided. By using such a supply amount control means, the supply amount of the contaminated soil can be controlled to be substantially constant, and the treatment of the contaminated soil can be reliably performed. As the supply amount control means,
Means for providing a scraper upstream of the conveying means may be employed.

(B) A recovery device for recovering the reaction accelerator from the treated soil after the treatment may be provided.
As such a recovery device, for example, a device having a magnet opposed to the transport surface of the transport means for transporting the treated soil to be treated can be used. According to this recovery device, the reaction accelerator can be recovered by the magnetic force of the magnet by using a reaction accelerator, for example, a photocatalytic particle having magnetism.

(C) The conveying means may be of a type for moving the soil to be treated in a plane or a type of moving the soil to be treated spirally. The latter processing device for moving the soil to be processed spirally has an advantage that the installation area of the processing device can be reduced.

Another method for treating contaminated soil according to the present invention includes a step of irradiating the contaminated soil to be treated with ultraviolet rays and moving the contaminated soil while applying vibration thereto.

[0024] Another apparatus for treating contaminated soil according to the present invention is a conveying means for moving the contaminated soil to be treated while applying vibration thereto, and irradiating the contaminated soil with ultraviolet light to the moving soil by the conveying means. Means for supplying ultraviolet light.

[0025]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the drawings.

[First Embodiment] FIG. 1 is a diagram schematically showing a contaminated soil treatment apparatus 100 and a treatment method using the treatment apparatus 100 according to a first embodiment.

(Treatment Apparatus) Contaminated soil treatment apparatus 100
Is roughly divided into a contaminated soil particle size selection device 10, a catalyst addition device 20, a vibration conveying device 30, an ultraviolet irradiation device 40, and a volatile component recovery device 50.

The particle size sorting device 10 sorts soil according to the particle size of the contaminated treated soil.

A means for storing and transferring the soil 1 to be treated, for example, a first hopper for storing the sorted soil 1 to be treated, is provided between the particle size sorting device 10 and the vibration conveying device 30. 12, a belt conveyor 14 for transferring the soil 1 to be treated from the first hopper 12, and a second
A hopper 16 is arranged.

The vibration transport device 30 has a transport section 32 to which vibration is applied by vibration means (not shown). The vibration transport device 30 applies a vibration of a specific size and direction to the transport unit 32, so that the soil 1 to be treated on the transport unit 32 is removed.
Can be transferred to the downstream side while vibrating.

A scraper 34 for regulating the amount of the soil 1 to be treated supplied to the transport section 32 is provided upstream of the transport section 32. By defining the amount of the soil 1 to be supplied to the transport unit 32, the thickness of the soil 1 to be treated can be made substantially constant, and the vibration state and the moving state of the soil 1 to be treated can be more appropriately controlled. The transport unit 3
2, at least above and to the side of the transport unit 32,
It is covered by a cover part 36.

The catalyst addition device 20 is provided on the upstream side of the transport section 32 and downstream of the scraper 34. A predetermined amount of photocatalyst particles is continuously supplied from the catalyst addition device 20 to the soil 1 to be treated.

As shown in FIG. 6, the photocatalyst particles 2 have a photocatalyst layer 2b formed on the surface of a carrier 2a. FIG.
FIG. 6A shows an example in which a photocatalyst layer 2b is formed on the surface of a porous carrier 2a having irregularities on the surface, and FIG.
An example in which a photocatalyst layer 2b is formed on the surface of a carrier 2a made of a hollow magnetic material will be described. Further, when the carrier is made of a hollow magnetic material or the like having poor adhesion to the photocatalyst layer such as titanium oxide, a resin is further added to the surface of the carrier such as the hollow magnetic material in order to enhance the adhesion of the photocatalyst layer. An intermediate layer such as a layer may be provided. Since specific examples of the carrier and the photocatalyst have already been described, the description is omitted.

The ultraviolet supply device 40 is provided above the transport section 32, for example, on the lower surface of the top plate of the cover section 36. The ultraviolet supply device 40 is configured by, for example, arranging a plurality of ultraviolet lamps 42 at predetermined intervals. Cover part 3
A mirror (not shown) that reflects the ultraviolet light may be provided on the inner wall of 6 in order to effectively use the ultraviolet light from the ultraviolet light supply device 40.

The volatile component recovery device 50 is a device for recovering volatile components generated from the soil 1 to be treated and releasing the exhaust gas to the atmosphere in a safe state. Specifically, the exhaust pipe 52 communicating with the inside of the cover portion 36 of the vibration conveying device 30 is provided.
And a gas processing unit 54 for processing volatile components. In the gas processing unit 54, volatile components are recovered by adsorption or decomposition.

FIG. 1 shows an example in which a plurality of vibration transport devices 30 are arranged to continuously treat the soil 1 to be treated. However, it is needless to say that the vibration transport device 30 may be singular or a type of the soil to be treated. And the length of the transport section 32 can be adjusted according to the amount of processing.

(Processing method) Next, the processing apparatus 1 shown in FIG.
A method for treating contaminated soil using No. 00 will be described.

(A) Sorting and Conveying Soil to be Treated First, the soil 1 to be treated carried by a vehicle or the like is put into a particle size sorting device 10. For example, the particle size sorting device 10 sorts the soil into a relatively large soil having a particle size of a predetermined size (about 50 mm) or more and a soil having a particle size smaller than the predetermined size. Soil having a relatively large particle size can be directly purified by a biodegradation treatment because the degree of surface contamination is lower than that of a soil having a small particle size. The soil having a particle size smaller than 50 mm is supplied to the first hopper 12. The soil 1 to be treated from the first hopper 12 is supplied to a second hopper 16 by a belt conveyor 14. Further, from the second hopper 16,
The soil 1 to be treated is supplied to the transport section 32 of the vibration transport device 30. At this time, the amount of the soil 1 to be treated supplied to the transport unit 32 is controlled by the scraper 34.

(B) Mixing of Photocatalyst Particles and Soil to be Treated A predetermined amount of photocatalyst particles are supplied at a predetermined timing from the catalyst addition device 20 to the soil 1 to be processed supplied to the transport section 32. The photocatalyst particles and the soil to be treated are mixed by the vibration of the transport unit 32 and further transported downstream of the transport unit 32. That is, when the transport unit 32 vibrates in a predetermined direction under a specific condition, for example, a frequency within a predetermined range, the soil 1 to be treated moves up and down and moves from upstream to downstream of the transport unit 32. The vibration conditions of the transport unit 32 are appropriately set according to the unit volume weight, amount, moisture content, contamination concentration, particle size, and the like of the soil to be treated.

Further, as shown in FIG.
Has a unit volume weight smaller than that of the soil 1 to be treated, and floats on the surface side of the soil 1 as the soil 1 moves up and down, and always exists near the surface of the soil 1 to be treated. As a result, the photocatalyst particles 2 can effectively contribute to the decomposition of pollutants due to ultraviolet rays performed on the surface of the soil 1 to be treated without waste. Therefore, by imparting vibration to the soil to be treated, the contaminants can be remarkably and efficiently decomposed by the synergistic effect of the ultraviolet light and the photocatalyst particles as compared with a case where the soil to be treated is simply stirred.

The size of the photocatalyst particles 2 is not particularly limited, but is preferably about 5 mm to 5 cm in consideration of the ease of floating due to the vibration of the soil 1 to be treated.

The above description regarding the photocatalyst particles also applies to other embodiments.

(C) Irradiation of Ultraviolet Light The ultraviolet ray supplying device 40 continuously irradiates the soil 1 to be treated transferred on the transport section 32 with ultraviolet rays. As described above, when the soil 1 to be treated is irradiated with ultraviolet rays, the catalytic action of the photocatalyst particles significantly improves the action of decomposing pollutants.

(D) Recovery of Volatile Components Volatile components generated during the treatment of the soil 1 to be treated are passed through an exhaust pipe 52 to a gas treatment section 54 of a volatile component recovery device 50.
Collected in. In the gas processing section 54, harmful volatile components are adsorbed on, for example, activated carbon or chemically decomposed to make them harmless, and the treated safe gas is released into the atmosphere.

As described above, according to the present embodiment, the contaminated soil to be treated is mixed with the photocatalyst particles, and the soil to be treated is vibrated while irradiating the soil with ultraviolet rays. By moving this, the pollutants in the soil to be treated can be efficiently purified.

(Recovery of Photocatalyst Particles) In this embodiment,
If necessary, the photocatalyst particles mixed into the treated soil 1 can be collected. An example of such a collecting device is shown in FIG.

In the example shown in FIG. 3, a catalyst recovery device 200 is installed continuously to the contaminated soil treatment device 100 shown in FIG. The catalyst recovery device 200 includes a vibration transport device 30, a plurality of magnetic drums 210 arranged on a transport unit 32 of the vibration transport device 30, and a recovery unit 220 that collects the collected photocatalyst particles 2. Since the catalyst recovery device 200 recovers the photocatalyst particles 2 by magnetic force, it is necessary to use a type having magnetism for the photocatalyst particles 2.

The magnetic drum 210 is arranged in contact with the soil 1 to be treated on the transport section 32, and is driven to rotate in the direction shown by the arrow. For example, the collection unit 220
It has a character-like shape, and is disposed upstream of the magnetic drum 210 such that the end of the collection unit 220 is in contact with the surface of the magnetic drum 210. Therefore, the vibration transport device 30
When the treated soil 1 moving above contacts the magnetic drum 210, the photocatalytic particles 2 having magnetism adhere to the surface of the magnetic drum 210. Then, the photocatalyst particles 2 attached to the surface of the magnetic drum 210 are scraped off from the surface of the magnetic drum 210 by the wall surface of the collection unit 220, and
Collected in. Such an operation is performed by a plurality of magnetic drums 21.
The photocatalyst particles 2 can be recovered from the soil 1 to be treated by repeating the process by the zero and the recovery unit 220.
The collected photocatalyst particles can be reused.

The operation of collecting the photocatalyst particles described above can be performed in another embodiment.

(Secondary Treatment of Soil to be Treated) After passing through the method for treating contaminated soil according to the present embodiment, or after further recovering the photocatalytic particles, if necessary, use another physicochemical treatment and microorganisms. At least one of the biodegradation treatments can be performed.

When the soil to be treated is biologically treated, it is not always necessary to collect the photocatalyst particles. In this case, as described above, it is desirable to use a porous carrier on which microorganisms can easily grow, as described above. In this case, the photocatalyst particles can be collected after the biodegradation treatment.

The secondary processing described above can be applied to other embodiments.

[Second Embodiment] FIG. 4 is a view schematically showing a contaminated soil processing apparatus 200 and a processing method using the processing apparatus 200 according to a second embodiment. It is the figure which part was broken so that it might be seen. Figure 1
The members having substantially the same functions as those of the processing apparatus 100 according to the first embodiment shown in FIG.

(Treatment Apparatus) FIG. 4 shows a vibration transport apparatus 30 and an ultraviolet irradiation apparatus 40 which constitute a treatment apparatus 200 for contaminated soil. Apparatus 1 for selecting particle size of contaminated soil shown in FIG.
0, the catalyst addition device 20 and the volatile component recovery device 50 are also the same in the present embodiment, so that illustration and description are omitted.

The vibration transport device 30 has a transport portion 32 that is spirally continuous on a vibration device 38. The vibration transport device 30 provides the transport unit 32 with a vibration of a specific size and direction by using the vibration device 38.
The above soil 1 to be treated can be transferred from the introduction part 31 to the discharge part 39 while being vibrated.

A scraper 34 for regulating the amount of the soil 1 to be treated supplied to the transport section 32 is provided upstream of the transport section 32 (on the introduction section 31 side). Transport unit 32
By defining the amount of soil to be treated 1 supplied to
The thickness of the soil 1 to be treated can be made substantially constant, and the vibration state and the moving state of the soil 1 to be treated can be more appropriately controlled. The scraper 34 can be appropriately provided in the middle of the transport section 32.

Around the transport unit 32, at least the transport unit 32
Is entirely or partially covered by a cover 36 formed of a tubular member or a plurality of plate members. The cover section 36 may be installed on the floor section 37 and have a function as a structural member for fixing the transport section 32.

In this example, the ultraviolet ray supply device 40 is arranged in a column shape at the center of the area surrounded by the cover 36. Therefore, the ultraviolet rays are radiated from the central axis of the cover portion 36 in a radial manner. The ultraviolet ray supply device 40 is configured by, for example, housing an ultraviolet ray lamp in a columnar transparent pipe. In this case, the transparent pipe also functions as a member for protecting the ultraviolet lamp. UV supply device 40
Is not limited to the illustrated example, and may be arranged in the axial direction with the ultraviolet lamps exposed. Also, the cover 3
A mirror (not shown) that reflects the ultraviolet light may be provided on the inner wall of 6 in order to effectively use the ultraviolet light from the ultraviolet light supply device 40.

(Processing Method) Next, the processing apparatus 2 shown in FIG.
A method for treating contaminated soil using No. 00 will be described. Also in this example, the processing method is basically the same as in the first embodiment.

(A) Sorting and transporting of soil to be treated First, a relatively large soil having a particle size of a predetermined size (for example, about 50 mm) or more and a particle size of a predetermined size (for example, about 50 mm) by a particle size sorting device not shown. Sorted into small soils.
Soil having a relatively large particle size can be directly purified by a biodegradation treatment since the degree of surface contamination is smaller than that of a soil having a small particle size. The soil 1 to be treated having a particle size smaller than a predetermined size is supplied to the transport unit 32 of the vibration transport device 30 by the belt conveyor of the introduction unit 31. At this time, the amount of the soil 1 to be treated supplied to the transport unit 32 is controlled by the scraper 34.

(B) Mixing of Photocatalyst Particles and Soil to be Treated A predetermined amount of photocatalyst particles are supplied at a predetermined timing from a catalyst adding device (not shown) to the soil 1 to be supplied to the conveying section 32. I have. The photocatalyst particles and the soil to be treated are mixed by the vibration of the transport unit 32 and further transported downstream of the transport unit 32. That is, the transport unit 3
2 vibrates in a predetermined direction at a specific condition, for example, a frequency within a predetermined range, so that the soil 1 to be treated moves up and down and from the upstream to the downstream of the spiral transport unit 32.

Since the photocatalyst particles and the mixed state of the photocatalyst particles and the soil to be treated are the same as in the first embodiment, the description is omitted.

(C) Irradiation of Ultraviolet Light The ultraviolet ray supplying device 40 continuously irradiates the soil 1 to be treated transferred on the transport section 32 with ultraviolet rays. As described above, when the soil 1 to be treated is irradiated with ultraviolet rays, the catalytic action of the photocatalyst particles significantly improves the action of decomposing pollutants.

(D) Recovery of Volatile Components Volatile components generated during the treatment of the soil 1 to be treated are processed by a volatile component recovery device (not shown) in the same manner as in the first embodiment. Releases into the atmosphere.

As described above, according to the present embodiment, the contaminated soil to be treated is mixed with the photocatalyst particles, and the soil to be treated is vibrated while irradiating the soil with ultraviolet rays. By moving this, the pollutants in the soil to be treated can be efficiently purified.

Further, in the present embodiment, since the transport section 32 is spiral, the vibration transport apparatus 30 can secure a long transport path with a small occupied area, and can reduce the size of the apparatus.

(Recovery of Photocatalyst Particles) In the present embodiment,
Similarly to the first embodiment, the photocatalyst particles mixed in the treated soil 1 can be collected as necessary.

(Secondary Treatment of Soil to be Treated) Further, in this embodiment, as in the first embodiment, after the contaminated soil is treated, or after the photocatalyst particles are further recovered, it is necessary to Secondary processing can be performed accordingly.

[Third Embodiment] FIG. 5 is a diagram schematically showing an apparatus 300 for treating contaminated soil and a processing method using the apparatus 300 according to a third embodiment. It is the figure which part was broken so that it might be seen. Figure 1
Members having substantially the same functions as those of the processing apparatuses of the first and second embodiments shown in FIG. 4 will be described with the same reference numerals. The third embodiment has a configuration very similar to that of the second embodiment, and differs in the point of the ultraviolet ray supply device 40.

(Treatment Apparatus) FIG. 5 shows a vibration conveying apparatus 30 and an ultraviolet irradiation apparatus 40 which constitute a treatment apparatus 300 for treating contaminated soil. Apparatus 1 for selecting particle size of contaminated soil shown in FIG.
0, the catalyst addition device 20 and the volatile component recovery device 50 are also the same in the present embodiment, so that illustration and description are omitted.

The vibration transport device 30 has a transport unit 32 that is spirally continuous on a vibration device 38. The vibration transport device 30 provides the transport unit 32 with a vibration of a specific size and direction by using the vibration device 38.
The above soil 1 to be treated can be transferred from the introduction part 31 to the discharge part 39 while being vibrated.

A scraper 34 for regulating the amount of the soil 1 to be supplied to the transport section 32 is provided upstream of the transport section 32 (on the introduction section 31 side). Transport unit 32
By defining the amount of soil to be treated 1 supplied to
The thickness of the treated soil 1 can be made substantially constant, and the vibration state and the moving state of the treated soil 1 can be more appropriately controlled. The scraper 34 can be provided as needed even in the middle of the transport unit 32.

Around the transport unit 32, at least the transport unit 32
Is entirely or partially covered by a cover 36 formed of a tubular member or a plurality of plate members. The cover section 36 may be installed on the floor section 37 and have a function as a structural member for fixing the transport section 32.

In this example, the ultraviolet ray supply device 40 is provided above the transport section 32, for example, on the lower surface of the upper transport section 32. The ultraviolet supply device 40 is configured by, for example, arranging a plurality of ultraviolet lamps 42 at predetermined intervals. Therefore, the ultraviolet rays are emitted from above the soil 1 to be treated on the transport unit 32. A mirror (not shown) that reflects the ultraviolet light may be provided on the inner wall of the cover part 36 in order to effectively use the ultraviolet light from the ultraviolet light supply device 40. In FIG. 5, reference numeral 33 denotes a column provided on the floor 37.

(Processing Method) Next, the processing device 3 shown in FIG.
A method for treating contaminated soil using No. 00 will be described. Also in this example, the processing method is basically the same as in the first embodiment.

(A) Sorting and Conveying of Soil to be Treated First, the soil 1 to be treated, which has been sorted by a particle size sorting device (not shown) in the same manner as in the first embodiment, is vibrated and conveyed by a belt conveyor of the introduction section 31. Transport unit 32 of device 30
Supplied to At this time, the amount of the soil 1 to be treated supplied to the transport unit 32 is controlled by the scraper 34.

(B) Mixing of Photocatalyst Particles and Soil to be Treated A predetermined amount of photocatalyst particles are supplied at a predetermined timing from a catalyst adding device (not shown) to the soil 1 to be supplied to the conveying section 32. I have. The photocatalyst particles and the soil to be treated are mixed by the vibration of the transport unit 32 and further transported downstream of the transport unit 32. That is, the transport unit 3
2 vibrates in a predetermined direction at a specific condition, for example, a frequency within a predetermined range, so that the soil 1 to be treated moves up and down and from the upstream to the downstream of the spiral transport unit 32.

The photocatalyst particles and the mixed state of the photocatalyst particles and the soil to be treated are the same as those in the first embodiment, and therefore will not be described.

(C) Irradiation of Ultraviolet Light The ultraviolet ray supplying device 40 continuously irradiates the soil 1 to be treated transferred on the transport section 32 with ultraviolet rays. As described above, when the soil 1 to be treated is irradiated with ultraviolet rays, the catalytic action of the photocatalyst particles significantly improves the action of decomposing pollutants.

(D) Recovery of Volatile Components Volatile components generated during the treatment of the soil 1 to be treated are treated by a volatile component recovery device (not shown) in the same manner as in the first embodiment. Releases into the atmosphere.

As described above, according to the present embodiment, the contaminated soil to be treated is mixed with the photocatalyst particles, and the soil to be treated is vibrated while irradiating the soil with ultraviolet rays. By moving this, the pollutants in the soil to be treated can be efficiently purified.

Further, in the present embodiment, as in the second embodiment, since the transport portion 32 is spiral, the vibration transport device 30 can secure a long transport path with a small occupied area, and The size can be reduced.

(Recovery of Photocatalyst Particles) In the present embodiment,
Similarly to the first embodiment, the photocatalyst particles mixed in the treated soil 1 can be collected as necessary.

(Secondary Treatment of Soil to be Treated) Further, in this embodiment, as in the first embodiment, after the contaminated soil is treated, or after the photocatalyst particles are further recovered, it is necessary to Secondary processing can be performed accordingly.

[Other Embodiments] In the above-described embodiment, the use of photocatalyst particles is essential. However, in some cases, the use of photocatalyst particles may be omitted. That is, by vibrating the soil to be treated, the decomposition action by the ultraviolet rays can be performed to some extent efficiently. In the case of this example, it can be implemented by not using photocatalyst particles in the above-described first to third embodiments.

The preferred embodiments of the present invention have been described above, but the present invention can take various forms within the scope of the gist. For example, means for vibrating the soil to be treated,
Means for transferring this may be provided separately. Further, if necessary, a treating agent or an additive such as a reaction accelerator other than the photocatalyst particles, a catalyst, an oxidizing / reducing agent, and water can be added to the soil to be treated.

[Brief description of the drawings]

FIG. 1 is a view schematically showing an apparatus and a method for treating contaminated soil according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a mixed state of a soil to be treated and photocatalytic particles by vibration.

FIG. 3 is a diagram schematically showing a catalyst recovery device and a recovery method for recovering photocatalyst particles from a treated soil to be treated.

FIG. 4 is a view schematically showing an apparatus and a method for treating contaminated soil according to a second embodiment of the present invention.

FIG. 5 is a view schematically showing an apparatus and a method for treating contaminated soil according to a third embodiment of the present invention.

FIGS. 6A and 6B are cross-sectional views schematically showing the structure of photocatalyst particles.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 soil to be treated 2 photocatalyst particles 2 a carrier 2 b photocatalyst layer 10 particle size sorting device 12 first hopper 14 belt conveyor 16 second hopper 20 catalyst addition device 30 vibration transport device 32 transport unit 34 scraper 36 cover body 38 vibrator 40 ultraviolet supply Device 42 Ultraviolet lamp 50 Volatile component recovery device 52 Exhaust pipe 100, 200, 300 Contaminated soil treatment device

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B03C 1/02 B03C 1/10 A 1/10 B09B 5/00 S B09C 1/10 3/00 E (72 Inventor Takahiro Nakamura 1-7-1, Kyobashi, Chuo-ku, Tokyo Inside Toda Ken Construction Co., Ltd. (72) Inventor Takuya Okuni 1-7-1, Kyobashi, Chuo-ku Tokyo Tokyo Inside Toda Ken Construction Co., Ltd. (72) Inventor Kozo Hagiya 1-20-10 Toranomon, Minato-ku, Tokyo Nishimatsu Construction Co., Ltd. (72) Inventor Hiroyuki Ishiwata 1-20-10 Toranomon, Minato-ku Tokyo, Nishimatsu Construction Co., Ltd. (72) Invention Person Masayoshi Yamazaki 1-20-10 Toranomon, Minato-ku, Tokyo Nishimatsu Construction F-term (reference) 4D004 AA41 AB02 AB06 AC05 CA08 CA09 CA43 CA50 CB45 CC09 4G069 AA03 AA10 BA04A BA04B BA48A CA04 CA11 EA02X EA02Y EC27 G A17 GA19 GA20

Claims (22)

[Claims] 1. A method comprising: mixing a reaction accelerator in contaminated treated soil; and irradiating the treated soil with ultraviolet rays, and moving the treated soil with vibration. How to treat contaminated soil. 2. The method for treating contaminated soil according to claim 1, wherein the reaction accelerator contains at least a photocatalyst. 3. The method for treating contaminated soil according to claim 2, wherein the photocatalyst is photocatalyst particles. 4. The method for treating contaminated soil according to claim 3, wherein the photocatalyst particles have a structure in which a photocatalyst is supported on a carrier. 5. The method for treating contaminated soil according to claim 3, wherein the photocatalytic particles have a smaller unit volume weight than the soil to be treated. 6. The method for treating contaminated soil according to claim 4, wherein the carrier is porous or has irregularities on the surface. 7. The method for treating contaminated soil according to claim 4, wherein the carrier has magnetism. 8. The method for treating contaminated soil according to claim 3, further comprising a step of collecting the photocatalyst particles from the treated soil after the treatment. 9. The method for treating contaminated soil according to claim 1, further comprising a step of secondary treating the treated soil after treatment. 10. The method for treating contaminated soil according to claim 9, comprising a step of collecting the photocatalyst particles from the treated soil after the secondary treatment. 11. An adding means for adding a reaction accelerator to contaminated treated soil, a conveying means for moving the treated soil while applying vibration thereto, and a treated soil moved by the conveying means. And a UV supply means for irradiating UV light on the contaminated soil. 12. The apparatus for treating contaminated soil according to claim 11, wherein the reaction accelerator contains at least a photocatalyst. 13. The vibration transfer device according to claim 11 or 12, wherein the transfer means applies a vibration to the soil to be processed, thereby moving the soil to be processed in a predetermined direction while mixing the soil. Equipment for treating contaminated soil. 14. An apparatus for treating contaminated soil according to claim 11, further comprising a supply amount control means for supplying a predetermined amount of the soil to be treated to said transport means. 15. An apparatus for treating contaminated soil according to claim 11, further comprising a recovery apparatus for recovering the reaction accelerator from the treated soil after the treatment. 16. The apparatus according to claim 15, wherein the recovery device has a magnet facing a transport surface of a transport unit for transporting the treated soil after the treatment, and the reaction accelerator having magnetism is magnetized. Equipment for treating contaminated soil to be collected. 17. An apparatus for treating contaminated soil according to claim 11, wherein said transport means moves the soil to be treated in a planar manner. 18. The apparatus for treating contaminated soil according to claim 11, wherein the transporting means spirally moves the soil to be treated. 19. A method for treating contaminated soil, comprising a step of irradiating the contaminated soil with ultraviolet light and moving the contaminated soil while vibrating the soil. 20. The method according to claim 19, wherein the ultraviolet light has peaks at wavelengths of 254 nm and 185 nm. 21. Conveying means for moving the contaminated soil to be treated while applying vibration thereto, and ultraviolet ray supplying means for irradiating the contaminated soil to be treated with the ultraviolet rays to the soil to be moved. Equipment for treating contaminated soil. 22. The apparatus for treating contaminated soil according to claim 21, wherein the ultraviolet light has peaks at wavelengths of 254 nm and 185 nm.