JP2011031208A - Apparatus and method for cleaning soil or sludge contaminated with volatile specific harmful substance - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an apparatus and a method for cleaning soil or sludge contaminated with volatile specific harmful substances of little environmental load and capable of efficiently performing purification treatment on the contaminated soil with a compact constitution without discharging to the outside not only harmful substances but also combustion gases, dust, and treated water that badly affect the environment. <P>SOLUTION: The apparatus for cleaning soil or sludge contaminated with volatile specific harmful substances include a thermally decomposing apparatus 1 that vaporizes and separates the contaminated substances 91 with a high-frequency induction heating section 14 to clean the soil 90; a condenser 2 that liquefies a contaminant 91; a detoxifying/treating apparatus 3 having an oil-water separation section 31 that separates fat and oil components 91a from the contaminant 91, sedimentation tanks 32, 33 that sediment the sludge from the contaminant 91 to remove the same, decomposing/treating sections 34, 35 that decompose organic compounds to discharge a detoxifying water 80; and a post-treatment apparatus 4 having a post-treatment/conveyance section 42 that conveys the soil 90, a post-treatment/cooling section 44 that cools and treats the soil 90 with the detoxifying water 80, and a detoxifying water supply section 45 that adds the detoxifying water 80 to the soil 90. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  In particular, the present invention relates to an apparatus and a method for purifying soil or sludge contaminated with volatile specific harmful substances for purifying soil or sludge contaminated with contaminants such as organic substances.

  In recent years, since soil contamination due to contaminants such as organic compounds and heavy metals has become apparent, various measures have been taken to purify contaminated soil. In general, examples of the purification treatment means of contaminated soil include various methods such as incineration treatment, high-temperature pyrolysis treatment, chemical decomposition treatment, microbial decomposition treatment, etc. In particular, each means of incineration treatment and high-temperature pyrolysis treatment Is mainly adopted.

  As a purification apparatus employing such a treatment method by heating, for example, as in the purification apparatus 100 shown in FIG. 2, a thermal decomposition apparatus 110 that heats with a burner while conveying contaminated soil, and the thermal decomposition apparatus A cooling device 120 for spraying cooling water on the pollutants separated and vaporized in 110 to liquefy them, and a pollutant separating device 130 for separating the liquefied pollutants into purified water and concentrated contaminants (sludge) are provided. Have been proposed (see, for example, Patent Document 1). According to the conventional contaminated soil purification apparatus shown in FIG. 2, with the above configuration, the pollutant is extracted as sludge, and the separated purified water is discharged into the water distribution system. In addition, the combustion gas generated during the heating of the soil is discharged to the atmosphere, and among the pollutants that have been vaporized and separated from the soil, the portion that has not been liquefied by the cooling water is subjected to a predetermined gas purification treatment and then into the atmosphere. Has been released.

  However, in the purification apparatus having the configuration described in FIG. 2 or Patent Document 1, for example, because the exhaust gas generated from the fossil fuel used for heating the contaminated soil is discharged to the atmosphere, the soil is purified. There is a problem that air pollution occurs. In addition, due to the recent increase in environmental awareness, contaminated soil is heat-treated in a way that does not generate harmful substances, rather than incineration using fossil fuels, which are likely to generate dioxins when burning the object to be treated. There was a need for a way to do it.

In order to solve the above problem, for example, as a device for performing dehydration and heat treatment of contaminated soil, sludge, manure, etc., a device using so-called high-frequency induction heating means is proposed without using combustion heating using fossil fuel. (See, for example, Patent Documents 2 to 4). According to the apparatuses and methods described in Patent Documents 2 to 4, since sludge and the like can be dehydrated and heat-treated without flame combustion, exhaust gas such as CO ₂ accompanying combustion is released to the atmosphere. In addition, an apparatus for treating such exhaust gas becomes unnecessary. In addition, since dioxins and the like generated by combustion of sludge and the like are not generated, it is possible to treat contaminated soil without causing air pollution and the like.

JP 2006-334502 A Japanese Patent Application Laid-Open No. 11-274349 JP 2004-255223 A JP 2004-290953 A

However, when purification processing of contaminated soil and sludge is performed using the purification device and the purification method having the configurations described in Patent Documents 2 to 4, there are the following problems.
First, in the purification device having the above-described configuration, it is necessary to process so-called quenching waste water that liquefies the pollutant that has been vaporized and separated from the contaminated soil. There is a problem that the size of the apparatus is increased. Moreover, when quenching waste water is purified, the pollutant is discharged as sludge, which is a concentrated pollutant, and there is a problem that handling is troublesome. Moreover, since a large amount of treated water is generated when the quenching waste water is purified, facilities, spaces, and the like for draining outside the system of the apparatus are required. Moreover, in the purification apparatus of the conventional structure, the odor resulting from the fats and oils component etc. which are contained in contaminated soil generate | occur | produces, and there exists a problem that a working environment falls.

  Furthermore, when contaminated soil or sludge is purified using conventional equipment or methods, the soil that is finally purified and discharged is extremely dry, so that dust is not collected during the collection of the purified soil. There has been a problem in that in addition to the work environment, the environment around the apparatus is degraded.

As mentioned above, when purification treatment of contaminated soil and sludge is performed using a purification device or purification method with a conventional configuration, many harmful substances are discharged out of the equipment. If not, it could adversely affect the environment. Moreover, when all the facilities capable of treating each of the above-mentioned emissions are prepared for the purpose of preventing adverse environmental effects, there is a problem that a large cost and installation place are required.
Therefore, when purifying soil or sludge containing pollutants consisting of volatile specified hazardous substances, fossil fuels, etc. are not combusted, and in addition to gases and wastewater containing harmful substances, dust etc. There has been a strong demand for an apparatus and method that can efficiently and safely purify contaminated soil and sludge.

  The present invention has been made in view of the above problems, and not only harmful pollutants but also combustion gases and dusts that adversely affect the environment, as well as safety without discharging a large amount of treated water to the outside. It is an object of the present invention to provide a purification device and a purification method for contaminated soil or sludge with volatile specified harmful substances, which can efficiently purify contaminated soil and sludge with an excellent and compact configuration.

As a result of intensive studies to solve the above problems, the present inventors have completed the present invention.
That is, the present invention relates to the following.

  [1] The soil includes a conveyance unit that conveys the soil or sludge containing the pollutant composed of a volatile specific harmful substance, which is an object to be treated, and a high-frequency induction heating unit that induction-heats the soil. Alternatively, a thermal decomposition apparatus that purifies the soil or sludge by vaporizing and separating the contaminant from sludge, a condensing apparatus that recondenses and liquefies the contaminant vaporized and separated by the thermal decomposition apparatus, and the liquefied An oil / water separation unit that separates fat and oil components from the contaminated contaminants, and a sedimentation tank that precipitates sludge that is agglomerated while stirring the contaminants, and further precipitates and removes sludge by stirring while adjusting the pH And a decomposition treatment unit for sequentially decomposing organic matter by treating the pollutant with active oxygen, and further performing activated carbon adsorption treatment to discharge detoxified water. The soil using a harm treatment apparatus, a post-treatment conveyance unit that conveys the soil or sludge from which the pollutants have been separated in the thermal decomposition apparatus while stirring, and the detoxification water discharged from the removal treatment apparatus Or the post-processing cooling part which cools sludge, and the detoxification water supply which adds the said detoxification water used for the cooling process in this post-processing cooling part to the said soil or sludge cooled by the said post-processing cooling part And a post-treatment device provided with a section. A device for purifying soil or sludge contaminated with volatile specified harmful substances.

[2] Furthermore, before introducing the soil or sludge containing the pollutant into the thermal decomposition apparatus, a dehydrating device for dehydrating while heating the soil or sludge is provided in advance. The apparatus for purifying soil or sludge contaminated with the volatile specified harmful substance according to [1] above.
[3] The dehydrator is provided with a heating unit that heats the soil or sludge containing the pollutant by introducing the pollutant and vapor vaporized and separated in the thermal decomposition apparatus. The apparatus for purifying soil or sludge contaminated with volatile specified harmful substances according to [2] above.
[4] The detoxification treatment device further includes a deodorization device that deodorizes the odor generated from the pollutant using direct current pulse plasma inside the detoxification treatment device. The apparatus for purifying contaminated soil or sludge with the volatile specific harmful substances according to any one of 1] to [3].
[5] In any one of the above [1] to [4], the condensing device recondenses and liquefies the contaminant by supplying cooling water containing ultrafine bubbles. A device for purifying soil or sludge contaminated with the specified volatile specified hazardous substances.
[6] The decomposition processing unit provided in the detoxification processing apparatus decomposes organic substances contained in the pollutant by adding ultrafine bubble-like active oxygen to the pollutant. The apparatus for purifying soil or sludge contaminated with volatile specified harmful substances according to any one of [1] to [5] above.

[7] The soil or sludge containing the pollutant consisting of volatile specified harmful substances, which is the object to be treated, is transported while stirring, and the soil or sludge is heated by high frequency induction, and the pollutant is extracted from the soil or sludge. A thermal decomposition step of purifying the soil or sludge by vaporizing and separating, a condensation step of recondensing and liquefying the contaminants vaporized and separated in the thermal decomposition step, and a fat component from the liquefied contaminants. Next, the agglomerated sludge is precipitated while stirring the pollutant, and further, the sludge is precipitated and removed by stirring while adjusting the pH, and the pollutant is then treated with active oxygen. After decomposing the organic matter, the detoxification treatment step of performing the activated carbon adsorption treatment to discharge the detoxification water, and the contaminant in the thermal decomposition step While transporting the separated soil or sludge while stirring, the soil or sludge is cooled by using the water removed in the detoxification treatment step, and the water for detoxification used for the cooling treatment And a post-treatment step of adding to the cooled soil or sludge, a method for purifying contaminated soil or sludge with a volatile specific harmful substance.

[8] Further, before introducing the soil or sludge containing the pollutant into the thermal decomposition step, a dehydration step of dehydrating while heating the soil or sludge is provided in advance. The method for purifying contaminated soil or sludge with the volatile specified harmful substance according to [7] above.
[9] The dehydration step warms the soil or sludge containing the contaminant by introducing the contaminant and vapor vaporized and separated in the thermal decomposition step, [8] A method for purifying contaminated soil or sludge with volatile specified harmful substances as described in 1.
[10] The method according to any one of [7] to [9], wherein the detoxification treatment step further deodorizes the odor generated from the pollutant using direct current pulse plasma. Purification method for contaminated soil or sludge with volatile specified hazardous substances.
[11] In any one of the above [7] to [10], in the condensation step, the contaminant is recondensed and liquefied by supplying cooling water containing ultrafine bubbles. A method for purifying contaminated soil or sludge with the volatile specified hazardous substances described.
[12] The above-mentioned [7] to [11], wherein the detoxification treatment step decomposes an organic substance contained in the pollutant by adding ultrafine bubble active oxygen to the pollutant. ] The purification method of the contaminated soil or sludge by the volatile specific harmful substance of any one of.

  According to the apparatus for purifying soil or sludge contaminated with volatile specified harmful substances of the present invention, it is provided with a high-frequency induction heating unit that induction-heats the soil or sludge, and thermal decomposition that purifies the soil or sludge by vaporizing and separating the pollutants. Equipment, a condensing device that recondenses the vaporized and separated pollutants, an oil / water separation unit that separates oil and fat components from the pollutants, and agglomerates sludge that is agglomerated while the pollutants are agitated for precipitation treatment A detoxification treatment apparatus comprising a settling tank and a decomposition treatment unit for sequentially decomposing organic matter and then performing activated carbon adsorption treatment and discharging detoxification water; and post-treatment conveyance for conveying soil or sludge while stirring A post-treatment cooling unit that cools the soil using the detoxification water discharged from the detoxification treatment device, and the detoxification water used in the post-treatment cooling unit to the cooled soil or sludge Detoxification water supply section Since construction comprising a post-processing device provided with not only harmful contaminants, other such combustion gases and dust adversely affect the environment, it is not to discharge a large amount of treated water from the system. In addition, since there is no need for incidental facilities such as a combustion gas processing facility, a fuel storage facility, and a pump, the entire apparatus can be reduced in size and cost. Therefore, it is possible to realize a purification device that can effectively purify contaminated soil or sludge with volatile specific harmful substances with a compact configuration that has an extremely low environmental load and is excellent in safety.

  Further, according to the method for purifying contaminated soil or sludge with volatile specified harmful substances of the present invention, the soil or sludge is transported while being agitated, and the soil or sludge is heated by high frequency induction to heat and separate the pollutants from the soil or sludge. Decomposition process, condensation process to recondensate pollutants and liquefaction, separation of oil and fat components from the liquefied pollutants, aggregation of the pollutants with stirring and removal of the precipitated sludge, followed by contamination After decomposing the organic substances that make up the substance, it is further treated with activated carbon adsorption to discharge the detoxified water, and the purified soil or sludge is transported with stirring and discharged in the detoxification process. And a post-treatment step of cooling the soil or sludge using the detoxified water and adding the detoxified water used for the cooling treatment to the cooled soil or sludge. Like, not only the harmful pollutants, other such as combustion gas and dust that adversely affect the environment, it is not to discharge a large amount of treated water to the outside of the system. Therefore, the environmental load is extremely small and the safety is excellent, and the contaminated soil can be efficiently purified.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which illustrates typically an example of the purification apparatus and purification method of contaminated soil or sludge by the volatile specific harmful substance of this invention, and is the schematic which shows the whole purification apparatus. It is a schematic diagram explaining the conventional purification apparatus and purification method of contaminated soil.

Hereinafter, a purification device and a purification method (hereinafter, simply referred to as a purification device or a purification method) for contaminated soil or sludge with volatile specific harmful substances according to the present invention will be described with reference to FIG. 1 as appropriate. (Refer to the conventional diagram in FIG. 2 if necessary). FIG. 1 is an overall schematic view of a contaminated soil or sludge purification apparatus 10 described in this embodiment.
Moreover, in embodiment of this invention demonstrated below, the purification apparatus and purification method for purifying contaminated soil are mentioned as an example, and is demonstrated.

[Purification device]
The purification apparatus 10 according to the present invention includes a high-frequency induction heating unit 14 that induction-heats a soil 90 containing a pollutant 91 made of a volatile specific harmful substance, and vaporizes the pollutant 91, as an example shown in FIG. A thermal decomposition apparatus 1 that purifies the soil 90 by separating, a condensing apparatus 2 that recondenses and liquefies the pollutant 91 that has been vaporized and separated, an oil / water separator 31 that separates the fat and oil component 91a from the pollutant 91, Precipitation tanks 32 and 33 for precipitating and removing sludge that has been agglomerated while stirring pollutant 91, and decomposition treatment units 34 and 35 for decomposing organic matter and then performing activated carbon adsorption treatment to discharge detoxified water 80. The soil removal treatment apparatus 3 is sequentially provided, the post-treatment transport unit 42 that transports the soil 90 while stirring, and the soil 90 is cooled using the removal water 80 discharged from the removal treatment apparatus 3. You And a post-treatment device 4 provided with a post-treatment cooling unit 44 and a detoxification water supply unit 45 for adding the detoxification water 80 used in the post-treatment cooling unit 44 to the soil 90 after cooling. It is roughly composed.

  In addition, the purification device 10 of the example shown in FIG. 1 further includes a dehydrating device for dehydrating the soil 90 in advance before the soil 90 containing the pollutant 91 is introduced into the thermal decomposition apparatus 1. 5 is provided.

The dehydrating apparatus 5 includes a dehydrating cylinder 51 that dehydrates the soil 90 therein, a conveying section 52 that conveys the soil 90 inside the dehydrating cylinder 51, and a motor 53 that is a driving source that rotates the conveying section 52. The heating unit 54 is configured to heat the soil 90 in the dehydrating cylinder 51.
The dewatering cylinder 51 is configured in a substantially cylindrical shape, and includes an input port 51a into which the soil 90 is input and an exhaust port 51b from which the dehydrated soil 90 is discharged.

  The transport unit 52 is a member that is provided inside the dehydrating cylinder 51 and that transports the soil 90 while being stirred from the input port 51 a toward the discharge port 51 b by being rotated by the motor 53. In addition, although the conveyance part 52 of the example shown in FIG. 1 is comprised as a substantially screw-shaped member, it is not limited to this, For example, what can carry powder transportation, such as a ribbon shape and a paddle shape, Can be employed without any limitation.

Although the detailed illustration is omitted, the heating unit 54 is a member having a heat exchange function that is provided around the dehydrating cylinder 51 so as to be wound in a pipe shape, for example. The heating unit 54 is capable of heating the soil 90 by being vaporized and separated from the soil 90 in the thermal decomposition apparatus 1 to be described later in detail, and introducing the heated pollutant 91 and unillustrated steam. Possible configuration.
In the dehydrating apparatus 5, the soil 90 is stirred by the transport unit 52 in the dewatering cylinder 51 and transported from the input port 51 a toward the discharge port 51 b by the heating unit 54. Dehydration is performed by heating.

The thermal decomposition apparatus 1 includes a heating cylinder 11 that thermally decomposes the soil 90 therein, a conveyance unit 12 that conveys the soil 90 while stirring the soil 90, and a drive source motor that rotates the conveyance unit 12. 13 and a high frequency induction heating unit 14 for heating the soil 90 in the heating cylinder 11.
The heating cylinder 11 is configured in a substantially cylindrical shape, similar to the dehydrating cylinder 51 provided in the dehydrating apparatus 5 described above, and an inlet 11a into which the soil 90 is input, and an outlet 11b from which the dehydrated soil 90 is discharged. In addition, a gaseous pollutant 91 vaporized and separated from the soil 90 and a gas discharge port 11c for discharging steam are provided. In the example shown in FIG. 1, a pipe 71 is connected to the gas discharge port 11 c and the other end of the pipe 71 is connected to the heating unit 54 of the dehydrator 5. Can be delivered to the heating unit 54.

  The conveyance unit 12 is a screw-like member that is provided inside the heating cylinder 11 and is rotated by the motor 13 to convey the soil 90 while stirring from the input port 11a to the discharge port 11b. In addition, although the conveyance part 12 of the example shown in FIG. 1 is comprised as a substantially screw-shaped member, it is not limited to this like the above-mentioned conveyance part 52, Ribbon shape, a paddle shape, etc., powder transport However, it is possible to adopt a configuration with no limitation.

  Although not shown in detail, the high-frequency induction heating unit 14 supplies a high-frequency current to the coil 14a provided to be wound around the heating cylinder 11, and controls the current value and voltage value of the coil 14a. And a high frequency control unit 14b. As such a high frequency induction heating part 14, a conventionally well-known thing can be employ | adopted without a restriction | limiting at all.

  The thermal decomposition apparatus 1 has the above-described configuration and the high-frequency induction heating unit 14 stirs the soil 90 in the heating cylinder 11 by the transport unit 12 and transports the soil 90 from the insertion port 11a toward the discharge port 11b. By heating 90, the pollutant 91 contained in the soil 90 and the vapor in which some water has evaporated are vaporized and separated to purify and detoxify the soil 90.

Here, in the purification apparatus 10 of this embodiment, the high frequency induction heating part 14 of the said structure is used as a means for heating the soil 90. FIG. By using such heating means that does not involve flame combustion with fossil fuel or the like, the soil 90 is pyrolyzed, so that exhaust gases such as CO _X , NO _X , SO _X, and soot accompanying combustion are released into the atmosphere. Therefore, an apparatus for treating the exhaust gas is not required. Further, unlike the combustion-type heating means, ancillary facilities such as a fuel storage facility and a pump are not required, so that the entire device can be reduced in size and cost.

  In general, a high-frequency induction heating method is excellent in heating efficiency and has a feature that the temperature controllability is extremely good because it takes almost no time for start-up as compared with a combustion type heating apparatus. Thereby, in the purification apparatus 10 of this embodiment, when heating the soil 90 with the high frequency induction heating apparatus 14, it becomes possible to perform temperature control excellent in responsiveness. In the purification device 10 of the present embodiment, for example, by providing a temperature sensor (not shown) in the vicinity of the coil 14a or the heating cylinder 11, the current value applied to the coil 14a while feeding back the detected temperature data to the high-frequency control unit 14b. -It becomes possible to control the voltage value and to heat the soil 90 at a predetermined temperature.

Here, since the heat resistance temperature of the metal member used for the heating cylinder 11 is generally about 600 ° C., the heating temperature by the high frequency induction heating device 14 may be about 600 ° C. or lower.
In addition, a pollutant 91 composed of a first class specific hazardous substance such as a VOC (organochlorine compound) in the soil pollution control law included in the contaminated soil 90 is the soil at the above temperature. 90 can be vaporized and separated, and the heating temperature may be set in accordance with the organic component to be decomposed. Moreover, the thermal decomposition apparatus 1 of this embodiment also vaporizes from the soil 90 not only the above-mentioned harmful substances but also fats and oils components that evaporate and vaporize at a temperature of 600 ° C. or less, metal components such as mercury, and harmful components such as cyanide. It is possible to separate.

  The condenser 2 recondenses and liquefies the pollutant 91 that has been vaporized and separated. As shown in FIG. 1, the condenser 21 introduces and condenses the pollutant 91, and cooling water 28 is added to the condenser 21. And a cooling tower 22 that re-cools and recirculates the cooling water 28, and a pump 23. In addition, the condenser device 2 in the example shown in FIG. 1 is provided with an ultrafine bubble processing unit 24 for making the cooling water 28 supplied to the capacitor 21 into cooling water containing ultrafine bubbles.

  The condenser 21 is vaporized and separated in the thermal decomposition apparatus 1, and an inlet 21 a into which a gaseous contaminant 91 supplied via the heating unit 54 of the dehydrator 5 is introduced, and a condensed liquid contaminant 91. And an outlet 21b for discharging the gas. Further, the condenser 21 is provided with a cooling water inlet 21 c into which the cooling water 28 supplied from the cooling tower 22 is introduced, and a cooling water outlet 21 d for discharging the used cooling water 28 and returning it to the cooling tower 22. ing.

The cooling tower 22 includes an inlet 22 a through which the cooling water 28 used in the condenser 21 is recirculated, and an outlet 22 b that discharges the recooled cooling water 28 to the outside by the pump 23. Although not shown in detail, the inside of the cooling tower 22 is provided with a heat exchanger for air-cooling the refluxed cooling water 28.
Further, in the illustrated condensing apparatus 2, a pipe 70 for cooling the high-frequency control unit 14 b provided in the above-described high-frequency induction heating unit 14 is connected to the outlet side of the pump 23.

The condensing device 2 of the present embodiment condenses the gaseous pollutant 91 introduced via the dehydrating device 5 and discharges it from the outlet 21d as a liquid pollutant 91 by the above-described configuration. Send to device 3.
In addition, since the condensing apparatus 2 in the illustrated example is configured to supply the cooling water 28 including the ultrafine bubble shape to the capacitor 21 by being provided with the ultrafine bubble processing unit 24, the pollutant 91 is condensed again and liquefied. The efficiency at the time is improved by about 10% compared with the conventional condenser.

  As shown in FIG. 1, the detoxification treatment apparatus 3 includes an oil / water separation unit 31 that separates the oil / fat component 91a from the pollutant 91, and a sedimentation tank 32 that precipitates and removes the sludge 39 aggregated from the pollutant 91. 33 and decomposition treatment units 34 and 35 for sequentially decomposing to removing organic substances and discharging detoxified water 80 are sequentially provided.

The oil / water separator 31 is configured in a tank shape, and after the liquid contaminant 91 introduced from the condensing device 2 is introduced into the interior, the oil / water separator 31 is retained in the contaminant 91 by retaining it for a predetermined time. The oil and fat component 91a is separated and recovered as a waste liquid.
Further, in the illustrated example, the liquid pollutant 91 that is used in the dehydrator 5 together with the liquid pollutant 91 introduced from the condensing device 2 and condensed in the heating unit 54 during the heating process. Is also configured to be introduced into the oil / water separator 31.

  The settling tanks 32 and 33 are configured to precipitate, remove, and collect the sludge 39 in which the components contained in the pollutant 91 are aggregated while stirring the pollutant 91. In the example shown in FIG. 2, a sedimentation tank 32 that collects a sludge 39 that has been precipitated by adding a flocculant 37 to the pollutant 91, and a PH adjuster 38 on the pollutant 91 from which the sludge 39 has been removed in the sedimentation tank 32. And a sedimentation tank 33 for further sedimenting and removing the sludge 39 in this order. In the illustrated example, a pump 3A is provided between each of the precipitation tanks 32 and 33, and stirring means 32A and 33A including a motor and a propeller are provided in each of the precipitation tanks 32 and 33.

  As the flocculant 37 used in the settling tank 32, those conventionally used in this field can be used without any limitation. Further, as the PH adjusting agent 38 used in the sedimentation tank 33, those conventionally used in this field can be used without any limitation.

  In the present embodiment, the sedimentation tanks 32 and 33 having the above-described configuration are used as means for collecting the sludge 39. However, the present invention is not limited to this, and any configuration can be used as long as solid-liquid separation is possible. For example, a conventionally known filtration device or the like can be used without any limitation.

  The decomposition processing units 34 and 35 decompose and remove organic substances contained in the pollutant 91. In the example shown in FIG. 2, the decomposition processing unit 34 decomposes organic substances by treating the pollutant 91 with active oxygen. And a decomposition treatment unit 35 that performs activated carbon adsorption treatment and discharges the detoxified water 80 in this order.

  The means for adding active oxygen to the pollutant 91 in the decomposition processing unit 34 is not particularly limited. However, as shown in the example of the drawing, the device includes an ultrafine bubble active oxygen supply unit 34A, and the active oxygen M in the form of ultrafine bubbles is supplied. A structure that can be added to the pollutant 91 is preferable. Thus, by providing the ultrafine bubble active oxygen supply part 34A capable of supplying the active oxygen M in the form of ultrafine bubbles to the pollutant 91, harmful organic substances contained in the pollutant 91 can be effectively decomposed. It becomes possible.

The decomposition processing unit 35 includes an activated carbon adsorbing member 35B in the tank 35A, and adsorbs organic substances and other harmful substances that cannot be completely removed by the decomposition processing unit 34 in the pollutant 91 introduced into the tank 35A. To be removed.
As the activated carbon adsorbing member 35B, any conventionally known member in this field can be used without any limitation. Further, by periodically exchanging the activated carbon adsorbing member 35B, it is possible to maintain the adsorbing action of organic substances and the like.

  The abatement treatment apparatus 3 of the present embodiment first separates and removes the oil and fat component 91a from the pollutant 91 in the oil / water separator 31 according to the above-described configurations. Then, after the components contained in the pollutant 91 are aggregated in the sedimentation tanks 32 and 33 and the precipitated sludge 39 is removed, the decomposition treatment units 34 and 35 decompose and remove the organic matter.

  In the abatement treatment apparatus 3 of the present embodiment, as shown in the example shown in FIG. 1, the odor generated from the above-described oil / fat component 91 a is further reduced to a direct current pulse. A configuration including a deodorizing device 36 that performs deodorizing treatment using plasma is more preferable from the viewpoints of environmental protection and improvement of the workplace environment.

  As shown in the example shown in FIG. 1, the post-processing device 4 includes a cooling cylinder 41 that cools the soil 90 therein, a post-processing transport unit 42 that transports the soil 90 while stirring, and the post-processing transport unit 42. A motor 43 as a driving source to be rotated, a post-processing cooling unit 44 that cools the soil 90 using the detoxifying water 80 discharged from the detoxification processing device 3, and the detoxification used in the post-processing cooling unit 44 It is comprised from the detoxification water supply part 45 which adds the water 80 to the soil 90 after cooling.

The cooling cylinder 41 is configured in a substantially cylindrical shape, similar to the dehydration cylinder 51 and the heating cylinder 11 described above, and an inlet 41a into which the soil 90 is input and a treated soil 90 to which the detoxifying water 80 is added after cooling. And a discharge port 41b for discharging the water.
The post-processing transport unit 42 is provided inside the cooling cylinder 41, and in the example shown in FIG. 1, is formed in a screw shape, like the transport unit 12 described above. The post-processing transport unit 42 is rotated by the motor 43 to transport the soil 90 while stirring from the inlet 41a toward the outlet 41b. The transport unit 52 is not limited to a substantially screw-shaped configuration as shown in the example of the drawing, and has a configuration capable of transporting powder, such as a ribbon or a paddle, like the above-described transport unit 12 or the like. Can be adopted without restriction.

Although not shown in detail, the post-processing cooling unit 44 is a heat exchange member provided around the cooling cylinder 41. The post-processing cooling unit 44 is configured to be able to cool the soil 90 by introducing the detoxifying water 80 detoxified in the detoxifying treatment apparatus 3 described above.
The detoxifying water supply unit 45 adds the detoxifying water 80 used in the above-described processing cooling unit 44 to the soil 90 after cooling, and can be composed of a known pipe or nozzle member.

The post-processing device 4 transports the soil 90 in the cooling cylinder 41 while stirring the soil 90 by the post-processing transport unit 42 in the above-described configuration. At this time, the soil 90 is cooled by the detoxified water 80 rendered harmless in the post-processing cooling unit 44.
Further, in the post-treatment device 4 provided in the purification device 10 of the present embodiment, the detoxification water 80 used in the post-treatment cooling unit 44 is added to the cooled soil 90 by the detoxification water supply unit 45. Thereby, the purification apparatus 10 does not discharge a large amount of wastewater to the outside of the system, and, for example, it is not necessary to select a treatment facility for factory wastewater, a wastewater discharge location, or the like. Moreover, since the soil 90 after the treatment contains the detoxified moisture, the treated soil 90 can be prevented from scattering, so that dust does not flow out to the outside.

  In addition, the purification apparatus 10 of this embodiment is not limited to the structure fixed and installed in a normal soil treatment facility. For example, the purification device 10 according to the present embodiment can be mounted on a large vehicle such as a trailer to be movable, and the purification device can be freely transported to the site where the soil 90 is collected. The purification apparatus 10 of the present embodiment does not discharge a large amount of treated water in addition to pollutants, combustion gas, dust, etc., and can suppress the environmental load to a minimum. Since no additional equipment such as a pump or a pump is required and the entire apparatus can be reduced in size, it is extremely suitable for movement. Further, by configuring the purification device 10 to be movable, it is not necessary to perform an environmental impact assessment.

  Further, when the purification device 10 is mounted on a vehicle such as a trailer so as to be movable, the heating decomposition device 1, the condensation device 2, the abatement treatment device 3, the post-treatment device 4 and the like as shown in FIG. About each installation, it is possible to mount in the same large vehicle, for example. Or it is good also as a structure which mounts said each equipment in a respectively separate vehicle, and connects and uses each with a pipe etc. in the processing site of the soil 90. FIG. In the case of such a configuration, the vehicle on which each facility constituting the purification device 10 is mounted can be made relatively small, so that there is an advantage that the transportation movement becomes easy.

  Moreover, although the purification apparatus 10 of the example demonstrated by this embodiment is set as the structure which adds the detoxification water 80 to the purified soil 90 in the post-processing apparatus 4, for example, a drainage path, a water storage tank, etc. If secured, the water can be drained outside the purification apparatus 10 (outside the system).

[Purification method of organic polluted soil]
Hereinafter, the method for purifying organic-contaminated soil according to the present embodiment will be described below, taking as an example the case where the soil 91 is purified using the purification device 10 according to the present invention described above.

  In the method for purifying organic polluted soil according to the present embodiment, the soil 90 containing the pollutant composed of the volatile specific harmful substances is transported while being stirred, and the soil 90 is heated by high frequency induction so that the pollutant 91 is removed from the soil 90. The thermal decomposition step of vaporizing and separating, the condensing step of recondensing the pollutant 91, and the sludge 39 obtained by aggregating the pollutant 91 with stirring after separating the oil component 91a from the liquefied pollutant 91 Then, the sludge is precipitated and removed by stirring while adjusting the pH, and then the organic matter is decomposed by treating the pollutant 91 with active oxygen, followed by further activated carbon adsorption treatment. A detoxification treatment process for discharging detoxification water, and transporting the purified soil 90 while stirring, and using the detoxification water 80 discharged in the detoxification treatment process, the soil 90 Cooling process, a method of and a post-treatment step of the abatement water 80 used in the cooling process is added to the cooled soil 90.

  In the purification method of the present embodiment, the purification apparatus 10 is used. First, before the soil 90 containing the pollutant 91 is introduced into the thermal decomposition step, the soil 90 is heated in advance by the dehydration apparatus 5 shown in FIG. However, it is preferable that a dehydration step of dehydrating is provided.

Next, in the thermal decomposition step, the soil 90 is purified by vaporizing and separating the pollutant 91 from the soil 90 by the thermal decomposition apparatus 1 shown in FIG.
Specifically, the soil 90 containing the pollutant 91 as the object to be treated is transported while being stirred by the transport unit 11, and the soil 90 is heated by the high-frequency induction heating unit 14, so that the pollutant is removed from the soil 90. 91 is vaporized and separated.

  In the thermal decomposition process, it is preferable that the heating temperature of the soil 90 by the high frequency induction heating unit 14 is, for example, about 600 ° C. or 600 ° C. or less. At this time, the heating temperature can be set to a desired range by controlling the electric power supplied to the coil 14 a from the high-frequency control unit 14 b provided in the high-frequency induction heating unit 14.

  Moreover, what is necessary is just to set suitably about the conveyance speed of the soil 90 by the conveyance part 12 in the thermal decomposition process, considering the capability of the whole thermal decomposition apparatus 1, and the quantity of the soil 90 to process.

  Next, in the condensing step, using the condensing device 2 as shown in FIG. 1, the pollutant 91 vaporized and separated in the above-described thermal decomposition step is recondensed and liquefied. At this time, it is preferable from the viewpoint of cooling efficiency and condensation efficiency to introduce the cooling water 28 containing ultrafine bubbles into the capacitor 21.

Next, in the detoxification treatment step, the detoxification treatment apparatus 3 as shown in FIG. 1 is used. First, the oil / water separation unit 31 separates the oil and fat component 91a from the liquefied contaminant 91.
Next, in the sedimentation tank 32, the sludge 39 precipitated by adding the flocculant 37 to the pollutant 91 is collected. Then, in the sedimentation tank 33, the pH adjusting agent 38 is further added to the pollutant 91 from which the sludge 39 has been removed in the sedimentation tank 32 to precipitate and remove the sludge 39.

  Next, in the decomposition processing unit 34, the organic matter is decomposed by performing active oxygen processing in which active oxygen is added to the pollutant 91. The active oxygen treatment at this time is preferably performed by supplying ultrafine bubbled active oxygen into the decomposition treatment unit 34 from the viewpoint that organic substances contained in the pollutant 91 can be effectively decomposed. Then, the decomposition processing unit 35 adsorbs and removes organic matter and other harmful substances that cannot be completely removed by the decomposition processing unit 34 using the activated carbon adsorption member 35B.

  In the detoxification process of the above procedure, it is preferable to deodorize the odor generated from the pollutant 91 or the fat component 91a using the DC pulse plasma using the deodorizing device 36.

  Next, in the post-treatment process, the post-treatment apparatus 4 as shown in FIG. 1 is used to cool the soil 90 from which the pollutant 91 has been separated in the thermal decomposition process, and the detoxification discharged in the detoxification treatment process. Water 80 is added to the soil 90. Thereby, the soil 90 can be taken out in a detoxified state without releasing dust into the atmosphere.

  As described above, according to the contaminated soil or sludge purification apparatus 10 with the volatile specific harmful substance of this embodiment, the high-frequency induction heating unit 14 that induction-heats the soil 90 is provided, and the pollutant 91 is vaporized and separated. The thermal decomposition apparatus 1 for purifying the soil 90 by the above, the condensing apparatus 2 for recondensing the vaporized and separated pollutant 91 to liquefy it, the oil / water separation unit 31 for separating the oil component 91a from the pollutant 91, and the pollutant 91 The settling tanks 32 and 33 for precipitating and removing the coagulated sludge while stirring the water, and the decomposition treatment units 34 and 35 for discharging the detoxified water 80 by decomposing the organic matter and then performing activated carbon adsorption treatment are sequentially provided. The abatement apparatus 3 provided, a post-processing transport unit 42 that transports the soil while stirring, and a post-process that cools the soil 90 using the abatement water 80 discharged from the abatement apparatus 3 Since the configuration includes the rejection unit 44 and the post-treatment device 4 provided with the detoxification water supply unit 45 for adding the detoxification water 80 used in the post-treatment cooling unit 44 to the soil 90 after cooling, In addition to harmful pollutants, a large amount of treated water is not discharged outside the system, in addition to combustion gases and dust that adversely affect the environment. In addition, since there is no need for incidental facilities such as a combustion gas processing facility, a fuel storage facility, and a pump, the entire apparatus can be reduced in size and cost. Therefore, it is possible to realize the purification apparatus 10 that can effectively purify soil or sludge contaminated with volatile specific harmful substances with a compact configuration that has an extremely low environmental load and is excellent in safety.

  In addition, according to the method for purifying contaminated soil or sludge with volatile specified harmful substances according to the present embodiment, the soil 90 is transported while being agitated, and the soil is heated by high-frequency induction to heat and vaporize and separate the pollutant 91 from the soil 90. Decomposition step, condensing step for recondensing the pollutant 91 and liquefying, and separating the oil and fat component 91a from the liquefied pollutant 91, and then aggregating the pollutant 91 with stirring to remove the precipitated sludge 39 Then, after decomposing the organic matter that constitutes the pollutant 91, a detoxification treatment step of performing activated carbon adsorption treatment to discharge the detoxification water 80, transporting the purified soil 90 while stirring, and removing it. A post-treatment step of cooling the soil 90 using the detoxification water 80 discharged in the harm treatment step and adding the detoxification water 80 used in the cooling treatment to the cooled soil 90; Because methods comprising, in the same manner as described above, not only harmful contaminants, other such combustion gases and dust adversely affect the environment, it is not to discharge a large amount of treated water from the system. Therefore, the environmental load is extremely small and the safety is excellent, and the contaminated soil can be efficiently purified.

  According to the configuration of the apparatus and method for purifying soil or sludge contaminated with volatile specified harmful substances according to the present invention, in addition to soil contaminated with pollutants discharged from factories and the like, industries containing pollutants as well. A great effect can be obtained by applying it to equipment for purifying wastes.

DESCRIPTION OF SYMBOLS 1 ... Thermal decomposition apparatus, 12 ... Conveying part, 14 ... High frequency induction heating part, 2 ... Condensing apparatus, 24 ... Ultrafine bubble processing part, 3 ... Detoxification processing apparatus, 31 ... Oil-water separation part, 32, 33 ... Precipitation tank , 34, 35 ... Decomposition processing unit, 34A ... Ultrafine bubble active oxygen supply unit, 35B ... Activated carbon adsorbing member, 36 ... Deodorizing device, 37 ... Coagulant, 38 ... PH adjuster, 39 ... Sludge, 4 ... Post-treatment Apparatus, 42 ... Post-processing conveyance part, 44 ... Post-processing cooling part, 45 ... Detoxification water supply part, 5 ... Dehydration apparatus, 54 ... Heating part, 10 ... Purification apparatus, 80 ... Detoxification water, 90 ... Soil, 91 ... pollutant, 91a ... oil component, M ... active oxygen

Claims (12)

It is provided with a transport unit that transports while stirring soil or sludge containing a pollutant composed of volatile specified harmful substances, which is an object to be treated, and a high-frequency induction heating unit that induction-heats the soil, from the soil or sludge A thermal decomposition apparatus for purifying the soil or sludge by vaporizing and separating the pollutants;
A condensing device for recondensing and liquefying the contaminants vaporized and separated by the thermal decomposition device;
An oil / water separator that separates oil and fat components from the liquefied pollutant, and sludge that has been aggregated while stirring the pollutant, and further sludge is precipitated by stirring while adjusting the pH to remove the sludge. A detoxification treatment apparatus comprising: a settling tank that performs an active oxygen treatment on the pollutant; and a decomposition treatment unit that sequentially performs activated carbon adsorption treatment and discharges detoxification water. ,
Cooling treatment of the soil or sludge using a post-treatment transport unit that transports the soil or sludge from which the contaminants have been separated in the thermal decomposition apparatus while stirring, and detoxification water discharged from the detoxification apparatus And a detoxification water supply unit for adding the detoxification water used for the cooling process in the post-treatment cooling unit to the soil or sludge cooled in the post-treatment cooling unit. And a device for purifying soil or sludge contaminated with volatile specified harmful substances, characterized by comprising an after-treatment device.   Furthermore, before introducing the soil or sludge containing the pollutant into the thermal decomposition apparatus, a dehydrator for dehydrating while heating the soil or sludge is provided in advance. A device for purifying soil or sludge contaminated with volatile specified harmful substances according to 1.   The dehydrator is provided with a heating unit that heats the soil or sludge containing the pollutant by introducing the pollutant and vapor vaporized and separated in the thermal decomposition apparatus. An apparatus for purifying soil or sludge contaminated with volatile specified harmful substances according to claim 2.   The said detoxification processing apparatus is further equipped with the deodorizing apparatus which deodorizes the odor generated from the said pollutant using DC pulse plasma inside this detoxification processing apparatus. Item 4. A device for purifying soil or sludge contaminated with volatile specified harmful substances according to any one of items 3 to 4.   The volatile property according to any one of claims 1 to 4, wherein the condensing device recondenses and liquefies the contaminant by supplying cooling water containing ultrafine bubbles. Purification equipment for contaminated soil or sludge with specific hazardous substances.   2. The decomposition processing unit provided in the detoxification processing apparatus decomposes an organic substance contained in the pollutant by adding ultrafine bubble active oxygen to the pollutant. A device for purifying soil or sludge contaminated with volatile specified harmful substances according to any one of claims 5 to 6. The soil or sludge containing the pollutant consisting of volatile specified harmful substances is conveyed while being stirred, and the soil or sludge is heated by high frequency induction to vaporize and separate the pollutant from the soil or sludge. A thermal decomposition step of purifying the soil or sludge by
A condensing step for recondensing and liquefying the pollutants vaporized and separated in the thermal decomposition step;
Separating oil and fat components from the liquefied pollutant, then precipitating the sludge agglomerated while stirring the pollutant, further sedimenting and removing sludge by stirring while adjusting the pH, Then, after decomposing the organic matter by treating the pollutant with active oxygen, further, a detoxification treatment step of performing activated carbon adsorption treatment and discharging detoxification water;
The soil or sludge from which the contaminants have been separated in the thermal decomposition step is transported while being stirred, and the soil or sludge is cooled using the detoxification water discharged in the detoxification treatment step, and the cooling And a post-treatment step of adding the detoxified water used in the treatment to the cooled soil or sludge. A method for purifying contaminated soil or sludge with a volatile specific harmful substance.   Furthermore, before introducing the soil or sludge containing the pollutant into the thermal decomposition step, a dehydration step of dehydrating while heating the soil or sludge is provided in advance. 7. A method for purifying contaminated soil or sludge with volatile specified harmful substances according to 7.   The volatilization according to claim 8, wherein the dehydration step warms the soil or sludge containing the pollutant by introducing the pollutant and vapor vaporized and separated in the pyrolysis step. Purification method of contaminated soil or sludge with sex-specific hazardous substances.   The volatility specification according to any one of claims 7 to 9, wherein the detoxification treatment step further deodorizes the odor generated from the pollutant using a direct current pulse plasma. Purification method of contaminated soil or sludge with harmful substances.   The volatility according to any one of claims 7 to 10, wherein in the condensation step, the contaminant is recondensed and liquefied by supplying cooling water containing ultrafine bubbles. Purification method for contaminated soil or sludge with specific hazardous substances.   12. The detoxification treatment step of decomposing an organic substance contained in the pollutant by adding ultrafine bubbled active oxygen to the pollutant. A method for purifying contaminated soil or sludge with the volatile specified harmful substances according to item 1.

Images