JP5075511B2 - Volatile material removal method and apparatus - Google Patents

Description

  The present invention relates to volatile organic compounds (volatile chemicals such as acetaldehyde, acetone, trichloroethylene, benzene and toluene, volatile oils such as gasoline, organic solvents such as toluene and trichloroethylene), volatile metals such as mercury and arsenic, and The present invention relates to a method and an apparatus for removing a volatile substance from a solid substance in which a volatile inorganic compound such as a metal compound, ammonia, hydrogen sulfide or the like (these substances are also referred to as volatile substances) is mixed.

  Conventionally, when volatile organic compounds such as acetaldehyde, acetone, trichlorethylene, benzene, toluene, and volatile oils such as gasoline, kerosene, and light oil are mixed in the soil for various reasons and left as they are, with time Therefore, it is important to prevent environmental pollution such as deep ground penetration and pollution of groundwater, and odor problems.

  Here, for example, in Patent Document 1, an inorganic compound such as quick lime that reacts exothermically with water is mixed with soil containing a volatile organic compound, and the reaction heat is used to add a volatile organic compound. A method of removing it by volatilization has been proposed.

  In this method, when treating a small amount of soil mixed with volatile organic compounds, the soil and quicklime may be mixed using a shovel or the like through the manual work of an operator to heat the entire soil. The volatile organic compound can be volatilized and removed. However, when the amount of soil to be processed increases, it is difficult to sufficiently mix the soil and quicklime, etc. only by the operator's manual work, and there is a risk that quicklime and the like will be unevenly distributed. In this case, although an exothermic reaction between quicklime and water occurs, the temperature of the surrounding soil such as unevenly distributed quicklime only rises, and the entire soil cannot be effectively heated. For this reason, there exists a situation that the volatility rate of the volatile organic compound in soil falls and the removal rate of a volatile organic compound cannot be raised.

  Further, in the above method, after surrounding the soil to be treated with a temporary tent or the like so that the volatilized volatile organic compound is not scattered into the atmosphere, the air in the temporary tent is passed through a blower or the like. Generally, a method of sucking and recovering a volatile organic compound that has volatilized in the temporary tent is employed. Accordingly, workers and the like perform the above-described work in the sealed temporary tent, and thus are exposed to a volatile organic compound that has been volatilized in an environment where the temperature is raised by the above-described exothermic reaction heat. There is a situation that workers and the like have to work under a certain environment. Furthermore, in this method, the construction period becomes long, and it is necessary to install a relatively large temporary tent.

In view of the above situation, for example, in Patent Document 2, as shown in FIG. 7, an inorganic compound that reacts exothermically with water is mixed with water-containing soil in which a volatile organic compound is mixed by an addition device 1, and then mixed. The apparatus 2 uniformly mixes the soil and the inorganic compound in the presence of moisture in the presence of moisture to cause an exothermic reaction, and then the mixture heated by the exothermic reaction is mixed with the volatile organic compound in the atmosphere. A volatile organic compound is evaporated while being reduced in size in a rotary soil granulating apparatus 3 that prevents volatilization of water, and the evaporated material and treated soil are recovered.
Japanese Patent No. 2589002 JP 2000-107741 A

  According to what is disclosed in Patent Document 2, it is not necessary for the worker to perform work in a poor environment, and after mixing the contaminated soil and the inorganic compound, by granulating them, Volatilization of the volatile organic compound can be promoted, so that the volatile organic compound can be effectively volatilized and recovered.

However, even the one described in Patent Document 2 may not be able to sufficiently remove volatile organic compounds and volatile oils from contaminated soil. The present inventors have found a method that can volatilize and recover volatile organic compounds and volatile oils more effectively.
Furthermore, the present inventors, among the volatile substances according to the present invention, are oils that are relatively difficult to volatilize and may cause off-flavors when volatilized (for example, crude oil, heavy oil, light oil, lubricating oil). The oil is effectively volatilized while preventing the odor from leaking to the surroundings from the soil contaminated with oil such as petroleum and mineral oils such as distillates and animal and vegetable oils). And found a suitable method for recovery.

  The present invention has been made in view of such circumstances, and more effectively, a volatile substance removing method and apparatus capable of volatilizing and removing a volatile substance from a solid substance mixed with a volatile substance. The purpose is to provide.

In order to achieve the above object, the volatile substance removal method according to the present invention comprises:
A solid substance mixed with a volatile substance is mixed with a volatilization promoting substance that promotes volatilization by achieving a desired temperature condition, and the volatile substance mixed in the solid substance is volatilized and removed. A method for removing volatile substances,
A finely divided mixing step of mixing the solid substance mixed with the volatile substance and the volatilization promoting substance into a predetermined finely divided state by a cutting blade rotated at high speed ;
An aeration treatment step for carrying out an aeration treatment in which the mixture of the solid substance mixed with the volatile substance and the volatilization promoting substance is exposed to an unsaturated atmosphere;
It is characterized by including.

The aeration process may include a process of dropping all or part of the mixture from a predetermined height.
The aeration process may include a process of dropping a part of the mixture from a predetermined height after separating a part of the mixture from another part.
A part of the mixture may be mixed with the other part after being dropped from a predetermined height.
The aeration process may be performed in the container using a rotating operation of the rotating container.
In addition, the present invention may be characterized in that the mixture is discharged from the container using the inclination of the rotating container.
The present invention can be characterized in that an inclination angle of the rotating container is variably set.
The present invention can be characterized in that volatile substances are removed while recovering volatile substances.
The present invention may be characterized in that a substance for extinguishing odors generated from volatile substances is added.
The present invention can be characterized in that the volatile substance is an oil.

The volatile substance removing apparatus according to the present invention mixes a solid substance mixed with a volatile substance and a volatilization promoting substance that achieves a desired temperature condition and promotes volatilization, and mixes the solid substance with the solid substance. A volatile substance removing device that volatilizes and removes volatile substances that are removed.
A mixing means for mixing the solid substance mixed with the volatile substance and the volatilization promoting substance into a predetermined finely divided state by a cutting blade rotated at high speed ;
An aeration means for performing an aeration process in which the mixture of the solid substance mixed with the volatile substance and the volatilization promoting substance is exposed to an unsaturated atmosphere;
It is characterized by including.

  According to the present invention, when a volatile substance mixed in a solid substance is volatilized, the volatile substance and the solid substance mixed with the volatile substance are volatilized in order to provide an environment suitable for the volatile substance to volatilize. Since the aeration treatment is performed on the mixture with the promoting substance so that not only the surface but also the interior is exposed to an unsaturated atmosphere, volatilization of the volatile substance can be promoted compared to the conventional method. Thus, the volatile substance can be more quickly and reliably removed from the solid substance mixed with the volatile substance.

  Hereinafter, a first embodiment of a soil purification method and apparatus, which is an aspect of a volatile substance removal method and apparatus according to the present invention, will be described in detail with reference to the accompanying drawings. The present invention is not limited to the embodiments described below.

Here, as the volatile substance targeted by the present invention, for example, volatile organic compounds mixed in soil, for example, trichloroethylene (boiling point 88 to 90 ° C.), tetrachloroethylene (boiling point 121.2 ° C.), dichloromethane ( Boiling point 40 ° C), carbon tetrachloride (boiling point 76.7 ° C), 1,2-dichloroethane (boiling point 83.7 ° C), 1,1-dichloroethylene (boiling point 57.3 ° C), 1,1, Organochlorine compounds such as 1-trichloroethane (boiling point 74.0 ° C), 1,1,2-trichloroethane (boiling point 113.7 ° C), 1,3-dichloropropene (boiling point 112.6 ° C), benzene Aromatic compounds such as toluene and xylene, ketones such as acetone, simazine, thiobencarb, low boiling petroleum hydrocarbons (decane, dodecane, cyclohexane, etc.) (For these substances alone course, it is the subject of the case to the invention, which is mixed for at least two substances).
In addition, the present invention can also be applied to organic solvents and volatile oils such as gasoline, kerosene, and light oil having a relatively low volatility, and further includes mercury, organometallic compounds, and the like. The volatile substance according to the present invention is not particularly limited as long as it is a volatile substance. In addition, a liquid in which a volatile substance is dissolved is also included in the volatile substance according to the present invention.

Examples of the volatilization promoting substance that achieves desired temperature conditions applicable to the present invention and promotes volatilization include inorganic compounds that react exothermically with water, such as calcium oxide (quick lime), magnesium oxide, and barium oxide. And alkali metal and alkaline earth metal oxides such as sodium oxide, strontium oxide and potassium oxide, and alkaline earth metal sulfates such as calcium sulfate and magnesium sulfate anhydrides. Among these, quick lime is preferable in terms of safety, price, calorific value and the like.
In addition, the present invention can use, for example, a neutralization reaction between an acid and an alkali, a percarbonate such as sodium percarbonate, a decomposition heat of hydrogen peroxide or the like as a reaction heat. Furthermore, it includes the case where volatilization is promoted by mixing substances that have been heated or heated to a desired temperature in advance, and therefore the volatilization promoting substance according to the present invention achieves the desired temperature condition and volatilizes. The substance is not particularly limited as long as it is a substance capable of promoting the above.

  In addition, although demonstrated here using soil as a representative example of the solid substance which concerns on this invention, this invention is not limited to soil, and if it is a solid substance, it will not specifically limit. For example, in addition to soil including soil and sand, civil engineering structures such as stones and roadbeds, waste, crushed stone, and glass are also included.

The volatile substance removal method according to the present invention is based on new findings discovered by the present inventors.
In other words, conventionally, in order to cause an exothermic reaction uniformly throughout the contaminated soil, an inorganic compound that exothermicly reacts with soil contaminated with volatile organic compounds (hereinafter also simply referred to as “contaminated soil”) with water. Were mixed uniformly and further granulated, but the present inventors not only finely mixed the contaminated soil and inorganic compound and mixed uniformly, but also a mixture of contaminated soil and inorganic compound. (In other words, simply referred to as “mixture”) air is exposed to the inside {in other words, unsaturated atmospheres other than saturated atmospheres where volatile substances cannot volatilize (targeting gases other than air) It was found that the volatilization of volatile organic compounds and the like can be further promoted.

  Furthermore, if the method based on this knowledge is used, the knowledge that volatilization of a volatile organic compound etc. can be accelerated | stimulated, without maintaining the temperature of the mixture of contaminated soil and an inorganic compound at high temperature was also acquired.

  In the soil purification method according to the first embodiment of the present invention based on the above knowledge, first, soil contaminated with a volatile organic compound or the like is uniformly refined with an inorganic compound that reacts exothermically with water. To mix. In addition, you may make it fine after mixing. That is, it is only necessary that the soil and the inorganic compound are mixed in a finely divided state.

  Next, it effectively maintains and promotes the exothermic reaction between the water in the soil and the mixed inorganic compound caused by this mixing, and an environment suitable for volatilization of volatile organic compounds and the like. In order to provide it, the aeration process (process which exposes to an unsaturated atmosphere) which contacts not only the surface of the mixture of contaminated soil and an inorganic compound but also the inside is performed.

  At this time, in order to prevent volatilized volatile organic compounds and the like from leaking to the outside air, the aeration treatment is performed in a closed space to some extent, while the volatile organic compounds and the like are collected in order to collect the volatile organic compounds and the like. The volatile organic compound is adsorbed on, for example, activated carbon and collected. As a recovery method, a method of cooling a volatile organic compound or the like and recovering it as a liquid can be employed.

  The above-described aeration process is executed for a predetermined period to sufficiently volatilize volatile organic compounds from the contaminated soil, and when the purification of the contaminated soil is completed, the process ends. The purified soil may be returned to its original position or used elsewhere.

In order to efficiently cause an exothermic reaction between the inorganic compound and moisture in the soil, if the moisture content of the soil is low, before or during mixing the soil and the inorganic compound. It is also possible to supply moisture.
The amount of the inorganic compound mixed with the soil can be set to an amount sufficient to volatilize the volatile organic compound contained in the soil. For example, the kind of the volatile organic compound or oil is known in advance. If it is present or predictable, an amount that can heat the soil to the temperature required to volatilize it can be determined and used in advance.

Next, a soil purification apparatus for executing the soil purification method according to the first embodiment of the present invention described above will be described below.
As shown in FIG. 1, in the soil purification apparatus according to the present embodiment, the soil contaminated with a volatile organic compound or the like is uniformly mixed with an inorganic compound that reacts exothermically with water while being sufficiently finely divided. Is provided.

  The fine-grain mixing device 100 can be applied as long as it is a device that can uniformly mix soil contaminated with a volatile organic compound or the like with an inorganic compound that reacts exothermically with water while being sufficiently fine-grained. However, for example, an apparatus as shown in FIG. 2 (see JP 2005-296903 A) is suitable. In addition, the said fine granulation mixing apparatus 100 will perform the process mixed in the state finely divided according to this invention, and is equivalent to the mixing means which concerns on this invention.

As shown in FIG. 2, the atomization mixing apparatus 100 is provided with a carry-in system 61. The carry-in system 61 preliminarily mixes contaminated soil to be treated with an inorganic compound that reacts exothermically with water. The processed material is transported, and is put into the processing container 21 through the inlet 22 of the processing container 21.
The loading system 61 is configured to transport only contaminated soil, and a loading system different from the loading system 61 is provided. An inorganic compound that reacts exothermically with water is loaded into the inlet 22 near the inlet 22 of the processing vessel 21. It can also be configured to.

  In the processing container 21, upon receiving power transmission from the electric motor 15, the rotating shaft 35 and the multi-stage and radial cutting blades 41 mounted on the rotating shaft 35 are rotated at a high speed, and the soil and inorganic compounds introduced into the processing container 21. In the range from the inlet portion 22 to the outlet portion 23, the blades are cut and cut several times by a plurality of stages and radial cutting blades 41 (that is, the cutting blades 41 during high-speed horizontal rotation). It is mixed while being finely divided. The diameter tends to decrease as the number of cutting blades per stage increases or the number of cutting blades increases, and the diameter tends to decrease as the peripheral speed of each cutting blade 41 increases. Show. In addition, it is preferable that the particle diameter after atomization is 50 mm or less.

  The contaminated soil that has been subjected to the finely divided mixing process passes through the outlet 23 of the processing container 21 and, for example, via the carry-out system 62 configured by a belt conveyor or the like, the air contact processing apparatus 200 shown in FIG. To be supplied.

  In addition, since volatile organic compounds and the like may be volatilized in the finely divided mixing process, a closed space is provided in the processing container 21 or in the outer periphery of the processing container 21 as necessary. By sucking the space with a blower or the like, the volatilized volatile organic compound or the like can be effectively recovered, for example, adsorbed on activated carbon or the like and recovered.

Next, the air contact treatment apparatus 200 according to the present embodiment will be described. The air contact processing device 200 corresponds to the aeration means according to the present invention.
As shown in FIG. 1, the air contact treatment apparatus 200 includes a rotary air contact treatment unit 210 that is rotationally driven by a rotation drive unit (not shown) that includes an electric motor and the like, and contaminated soil and inorganic. An inlet 220 for supplying (carrying in) the compound mixture to the processing unit 210 and an outlet 230 for discharging (carrying out) the mixture (soil) that has been processed and purified by the air contact processing unit 210. Is done.

  As shown in FIG. 3, the air contact processing unit 210 is configured to include a hollow cylindrical portion 211 having a space inside, and extends on the inner peripheral surface of the cylindrical portion 211 by a predetermined length in the longitudinal direction. And the protrusion part 212 which protrudes inward predetermined amount is provided. A plurality of the protruding portions 212 may be arranged evenly or unevenly around the rotation center axis of the cylindrical portion 211. The protruding direction of the protruding portion 212 is not limited to the radial direction toward the central axis direction of the cylindrical portion 211 as shown in FIG. 3, but is formed in a direction that intersects the radial direction at a predetermined angle. Can. Further, the shape of the protruding portion 212 is not limited to the shape shown in FIG. 3, and is a shape that is advantageous for scraping and lifting the mixture, for example, a cross section of the surface on which the mixture is placed is a concave curved surface. It can also be formed to have a shape.

  Here, in the cylindrical portion 211, a mixture of the contaminated soil and the inorganic compound, which is discharged (unloaded) from the outlet portion 23 of the processing container 21 and is finely divided and mixed in the fine particle mixing device 100, is supplied to the inlet portion. 220 is supplied (loaded).

  The mixture supplied into the cylindrical portion 211 is heated by an exothermic reaction due to mixing of moisture in the contaminated soil and the inorganic mixture, and volatilization of volatile organic compounds and the like contained in the contaminated soil is performed. At this time, the cylindrical portion 211 forms a space that is closed to some extent in cooperation with the inlet portion 220 and the outlet portion 230, and thus has an action of keeping the exothermic reaction heat. It is relatively easy to maintain the temperature of the mixture at a predetermined level, which contributes to effectively maintaining and promoting the volatilization of volatile organic compounds and the like in the contaminated soil.

  Furthermore, since the protruding portion 212 is disposed on the inner periphery of the cylindrical portion 211, as shown in FIG. 4, at least a part of the mixture passes through the protruding portion 212 as the cylindrical portion 211 rotates. After being lifted by a predetermined amount, the tip of the protrusion 212 is gradually dropped as it moves to a position facing downward.

  That is, in the present embodiment, when at least a part of the mixture is lifted through the protrusion 212, at least a part of the mixture is separated from the other part, so that the mixture is air (that is, an unsaturated atmosphere). ) Can be increased, so that the air can be contacted not only to the surface of the mixture but also to the inside, more effectively and reliably than the prior art that merely stirs the mixture. .

  In addition, since at least a part of the mixture that is dropped is scattered while accompanied by an operation such as reversal, the chance of coming into contact with the air to the inside increases. Thus, compared with the prior art in which the mixture is simply stirred, air can be brought into contact not only with the surface of the mixture but also with the interior. In the above description, at least a part of the mixture is dropped. However, the present invention is not limited to this, and the entire mixture is dropped, thereby increasing the chance of contacting the air to the inside. Anyway, it is good.

As described above, according to the present embodiment, the entire mixture in the cylindrical portion 211 can be efficiently brought into contact with air (unsaturated atmosphere), so that the mixture is simply stirred as in the prior art. In comparison with this, volatilization of volatile organic compounds and the like can be greatly promoted, and thus the purification efficiency of contaminated soil can be increased. In other words, this embodiment can provide an environment suitable for volatilization of volatile organic compounds and the like contained in contaminated soil, and improves the purification efficiency of soil contaminated with volatile organic compounds and the like. Can be increased.
In addition, since the mixture is finely divided and dispersed and mixed, and the contact treatment with the air described above is performed, the soil purification efficiency can be increased to the maximum, so the amount of inorganic compound used can be kept to a minimum. And the processing time for purification can be shortened. Furthermore, even if the soil to be treated is viscous soil, it can be purified well.

  Here, as shown in FIG. 1, the cylindrical portion 211 is disposed with a predetermined inclination angle A so as to become a lower position as it proceeds in the direction in which the mixture should be carried out. Therefore, the mixture carried into the cylindrical portion 211 from the inlet 220 is gradually brought into contact with the air in the cylindrical portion 211 through the protruding portion 212 as the cylindrical portion 211 rotates. Proceed to outlet 230.

  The longitudinal length, the inner diameter, and the rotation speed of the cylindrical portion 211 are values that can sufficiently volatilize volatile organic compounds and oils until the mixture carried from the inlet portion 220 reaches the outlet portion 230. Set to

Here, as an example, for example, when the input amount of the mixture is 20 m ³ / hour, in order to sufficiently volatilize the volatile organic compound or the like, the mixture is placed in the cylindrical portion 211 for 10 to 15 minutes. It is preferable to stay for a certain amount of time, and considering the transportability to the work place (size that can be transported by a truck or the like), for example, the longitudinal length of the cylindrical portion 211 is about 7 m, and the rotational speed of the cylindrical portion 211 is Can be set to 20 RPM (Revolution Per Minutes).

Here, when the input amount of the mixture is 20 m ³ / hour and the residence time in the cylindrical portion 211 having a length of 7 m in the longitudinal direction is 10 minutes, the amount of the mixture existing in the cylindrical portion 211 is 3.3 m ³ ( ^{= 20m 3 / 60min × 10min)} : about 5.9ton next, 0.47 m per cylinder portion ^{1m 3 (= 3.3m 3/7} ): a mixture of about 0.85ton exists. In order to make the dropping effect of the mixture effective, it is considered that the volume of the mixture is about 4 times the amount of the mixture 0.47 m ³ in terms of per 1 m of the cylinder portion. Therefore, the necessary inner diameter (diameter) of the cylinder portion is necessary. Becomes φ1.5 m {= 2 × (0.47 × 4 / 3.14) 1/2}.

When the residence time is 10 minutes, the length of the cylindrical portion 211 in the longitudinal direction is 7 m, and the rotational speed of the cylindrical portion 211 is 20 RPM, the amount (feed) of the mixture to be fed per rotation is 35 mm. / Rev (= 7 m / 200). Therefore, in this case, the inclination angle A of the cylindrical portion 211 is 1.6 ° {= tan ⁻¹ (35/1240)}. Therefore, it is preferable that the inclination angle A of the cylindrical portion 211 is set to approximately 0 ° <A <5 ° from the viewpoint of a residence time in which volatile organic compounds and oils can be sufficiently volatilized.

  In the cylindrical portion 211, after the volatile organic compound in the contaminated soil is sufficiently volatilized and the contaminated soil is purified, the mixture is discharged (carried out) from the outlet portion 230 to the outside. As a carry-out method, a general belt conveyor or the like can be used, and a method of temporarily stocking in a container or the like and then carrying it together can be adopted.

  The cylindrical portion 211 may be supported by an outer diameter portion of the inlet portion 220 and an inner diameter portion of the outlet portion 230 so as to be rotatable by a bearing or the like. It may be installed and supported rotatably.

  Here, in the present embodiment, suction means 250 such as a blower is provided in the internal space of the cylindrical portion 211, the inlet portion 220, and the outlet portion 230 so that volatile organic compounds and the like volatilized in the cylindrical portion 211 do not leak to the outside. The volatile organic compound and the like which are sucked in and volatilized are collected, and are collected by being adsorbed by a collecting means 240 such as activated carbon. As shown in FIG. 1, the flow of air in the internal space caused by the suction of the suction means 250 is set in a direction opposite to the direction of carrying out the mixture to prevent re-adsorption to the mixture side of volatilized volatile substances. From the viewpoint of the above, it is preferable. As a recovery method, a method of cooling a volatile organic compound or the like and recovering it as a liquid can be employed.

As described above, in this embodiment, soil contaminated with a volatile organic compound or the like is uniformly mixed with an inorganic compound that reacts exothermically with water while being sufficiently finely divided, and the soil caused by this mixing It is intended to purify contaminated soil by volatilizing volatile organic compounds contained in the contaminated soil using an exothermic reaction that occurs between the moisture in the mixture and the mixed inorganic compound. In order to provide a suitable environment for volatilization of volatile organic compounds, etc. when volatilizing volatile organic compounds contained in the soil, not only the surface but also the interior of the mixture of contaminated soil and inorganic compounds Air contact treatment to contact with air is performed.
According to the present embodiment in which such an air contact treatment is performed, volatilization of volatile organic compounds and the like can be promoted, and thus contaminated soil can be purified more quickly and reliably.

  In addition, by configuring the air contact processing apparatus 200 according to the present embodiment in a compact manner, it is possible to remove the volatile organic compounds and the like at the site by bringing the apparatus into the site.

  By the way, when the heat insulation of the cylindrical part 211 which concerns on this Embodiment is improved, the heat | fever which generate | occur | produces by the said exothermic reaction is kept warm, and it is calculated | required that volatilization of a volatile organic compound etc. is accelerated | stimulated further etc. In, for example, a heat insulating material or a heater is disposed around the cylindrical portion 211, the cylindrical portion 211 is constituted by a double pipe having an air layer therebetween, or a heat insulating material or A heater or the like may be provided, or warm air may be passed through the air layer.

The activated carbon employed in the recovery means 240 according to the present embodiment can be recycled. Here, activated carbon can be regenerated, and regeneration of activated carbon includes a heat regeneration method and a chemical regeneration method.
When used for solvent recovery, deodorization, air purification, etc. for the gas phase, the adsorption is mainly physical adsorption or adsorption close to it, so it is regenerated using heated steam at 120 ° C to 150 ° C. By doing so, it can be used repeatedly. However, when used for a liquid phase such as water treatment, adsorption occurs in a state close to or near chemical adsorption, so regeneration with heated steam is not sufficient, and it is more severe than regeneration in the case of gas phase adsorption. It is necessary to regenerate under various conditions. Generally, so-called reactivation is performed with water vapor in a temperature range of 400 ° C to 950 ° C.
As the number of regenerations increases, the effective adsorption amount decreases. Generally, the regeneration loss is said to be 3% to 10% for granular activated carbon and about 20% for powdered activated carbon, and the regeneration operation becomes difficult when the regeneration is large.
In particular, the price of granular activated carbon must consider adsorption capacity and lifetime due to regeneration. It is necessary to accurately evaluate not only the results of adsorption experiments but also the results of regeneration experiments.

  By the way, the cross-sectional shape in the direction substantially orthogonal to the longitudinal direction of the cylindrical portion 211 according to the present embodiment is not limited to a circular shape, but may be another shape having an internal space such as an elliptical shape or a polygonal shape. Of course there may be.

  The protruding portion according to the present embodiment can be formed with a predetermined lead angle B, for example, as in the protruding portion 212A shown in FIG. With this configuration, the mixture in the cylindrical portion 211 (including the mixture placed on the protruding portion 212A) is moved while being guided along the twist angle B with the rotation operation. . Therefore, even if the cylindrical portion 211 does not have the predetermined inclination angle A, it is possible to advance the mixture in the direction in which the mixture should be carried out.

  In the present embodiment, the protruding portion 212 has been described as a means for lifting and dropping the mixture. However, the present invention is not limited to this, and for example, the inner surface of the cylindrical portion 211 is shaken. It is also possible to configure the mixture to be lifted and dropped by means of bucket-like means movably attached.

  By the way, in the present embodiment, the internal space is sucked by the suction means 250 such as a blower. At that time, since the outside air flows into the internal space from the opening or the gap, the inside of the mixture is reached. In the process of contacting with air (aeration process), fresh air that can sufficiently volatilize volatile substances can be supplied to the inside of the mixture, so that the aeration process can be performed effectively.

  Further, in the present embodiment, as an example of the process of bringing the mixture into contact with air (aeration process in which the mixture is exposed to an unsaturated atmosphere), the dropping of the mixture has been described as an example. The present invention is not limited to this, and any treatment that can be exposed to an unsaturated atmosphere up to the inside of the mixture belongs to the scope of the present invention. For example, the process of supplying air from the bottom to the top of the mixture also belongs to the scope of the present invention.

  Next, a second embodiment according to the present invention will be described in detail with reference to the accompanying drawings. The present invention is not limited to the embodiments described below.

  The second embodiment can be applied to the volatile substance having volatility according to the present invention, as in the first embodiment, but in the second embodiment, the volatility according to the present invention is applicable. Among the substances, oils that are relatively difficult to volatilize and that may generate a strange odor such as oil odor when volatilized (mineral oils such as crude oil, heavy oil, light oil, lubricating oil, and fractions) And animal / vegetable oils such as low-boiling volatile components contained in light oil (aromatics such as benzene, naphthalene, phenol and xylene, linear saturated hydrocarbons, etc.)) One aspect of a volatile substance removal method and apparatus suitable for volatilizing and recovering oils from contaminated soil without leaking a strange odor to the surroundings will be described. In addition, the same code | symbol shall be attached | subjected to the element similar to having demonstrated in 1st Embodiment, and detailed description shall be abbreviate | omitted.

  As shown in FIG. 6, the volatile substance removing apparatus according to the second embodiment can be the same as that of the first embodiment shown in FIG. Finely-mixed soil mixed with soil and a chemical that is a volatilization promoting substance (for example, quicklime, trade name “CALCOA (registered trademark)” (a material coated with quicklime with higher fatty acid)) The mixture is introduced into the chemical mixing device 100 and mixed uniformly while being sufficiently finely divided.

  For example, an apparatus as shown in FIG. 2 can be adopted as the atomizing and mixing apparatus 100 that functions as the mixing means according to the present invention.

  The contaminated soil that has been subjected to the fine granulation mixing process by the fine granulation mixing apparatus 100 is supplied (carried in) to the air contact treatment apparatus 200. The air contact processing device 200 functioning as an aeration unit according to the present invention is rotationally driven by a rotational drive unit (not shown) configured to include an electric motor and the like, as in the first embodiment. The air contact treatment unit 210, the inlet 220 for supplying (carrying in) the mixture of contaminated soil and inorganic compounds to the treatment unit 210, and discharging the mixture (soil) treated and purified by the air contact treatment unit 210 ( And an outlet 230 for carrying out.

  Here, in the second embodiment, as shown in FIG. 6, in order to prevent the components volatilized from oils and the like and odors from leaking to the outside, the processing container of the atomization mixing device 100 is used. The outlet portion 23 (see FIG. 2A) 21 and the inlet portion 220 of the air contact processing device 200 are connected to each other while blocking communication with the outside.

  Moreover, in 2nd Embodiment, since oils etc. are volatilized, there exists a possibility that strange odors, such as an oily odor, may generate | occur | produce in the case of volatilization. For this reason, in the second embodiment, for example, a deodorizer addition device 300 that supplies and supplies an oil odor reducing agent, a deodorizer, and the like to the inlet portion 220 via the supply passage 310 is connected. This is a substance (chemicals, etc.) for the purpose of deodorizing and deodorizing oily odors such as oil odors mainly generated when oils volatilize from contaminated soil. For example, baking soda, ozone gas, hydrogen peroxide, condensation type Tannin or the like can be employed. Further, for example, it is possible to adopt or use a substance (medicine or the like) for masking off-odour and eliminating the odor. Furthermore, as shown in FIG. 6, it is preferable to install a recovery means 240 such as an activated carbon treatment tower (deodorant tower) at the outlet 230 to prevent off-flavors such as oily odor generated during volatilization.

  The air contact processing unit 210 is similar to that shown in FIG. 3 and includes a hollow cylindrical portion 211 having a space inside, and the inner circumferential surface of the cylindrical portion 211 has a predetermined length in the longitudinal direction. A protruding portion 212 extending inward and protruding inward by a predetermined amount is provided.

  The cylindrical portion 211 is supplied (carrying in) through the inlet portion 220 with a mixture of contaminated soil and inorganic compound that has been finely divided and mixed in the fine particle mixing device 100.

  As in the first embodiment, the mixture supplied into the cylindrical portion 211 is heated by an exothermic reaction caused by mixing the moisture in the contaminated soil with the inorganic mixture, and volatilizes the oils and the like contained in the contaminated soil. Is done. Furthermore, since the protruding portion 212 is disposed on the inner periphery of the cylindrical portion 211, at least a part of the mixture is lifted by a predetermined amount via the protruding portion 212 as the cylindrical portion 211 rotates. Be dropped.

  That is, also in the second embodiment, the entire mixture in the cylindrical portion 211 can be efficiently contacted with air (unsaturated atmosphere), so that the mixture is simply stirred as in the prior art. In comparison, volatilization of oils and the like can be greatly promoted, and thus the purification efficiency of contaminated soil can be increased. In other words, this embodiment can provide an environment suitable for volatilization of oils and the like contained in the contaminated soil, and can improve the soil purification efficiency.

  In addition, since the mixture is finely divided and dispersed and mixed, and the contact treatment with the air described above is performed, the soil purification efficiency can be increased to the maximum, so the amount of inorganic compound used can be kept to a minimum. Even if the oils are not easily volatilized, the processing time for purification can be shortened as compared with the conventional method.

  Here, as shown in FIG. 1, the cylindrical portion 211 according to the second embodiment is arranged with a predetermined inclination angle A so as to become a lower position as it proceeds in the direction in which the mixture should be carried out. However, in the second embodiment, for example, oils that are relatively less volatile in consideration of the residence time of the mixture in the cylindrical portion 211 and the carry-out (moving) speed of the mixture in the cylindrical portion 211. It is possible to adopt a configuration in which the tilt angle A is variable so that the can be sufficiently volatilized.

  That is, since the target oils in the present embodiment are relatively difficult to volatilize, it may be assumed that the oil needs to be sufficiently volatilized by staying in the cylindrical portion 211 for a relatively long time.

  Therefore, in order to cope with such a case, in the present embodiment, for example, when a predetermined amount of a mixture of contaminated soil and inorganic compound is supplied to the cylindrical portion 211, the first supplied mixture is supplied from the cylindrical portion 211 to the outlet portion 230. Before being carried out, the predetermined inclination angle A is changed to approximately 0 ° C. (that is, approximately horizontal), and the supply of the mixture to the cylindrical portion 211 is temporarily stopped or the supply amount thereof is suppressed to a very small amount.

  A period during which oil or the like can be volatilized from the mixture already supplied into the cylindrical part 211, for example, the cylindrical part 211 while maintaining the predetermined inclination angle A at substantially 0 ° C. (substantially horizontal). And the oil or the like is volatilized in the air contact processing unit 210.

  After that, if oil or the like can be volatilized from the mixture supplied into the cylindrical portion 211, the predetermined inclination angle A is increased and the volatilization processing of the oil or the like in the cylindrical portion 211 is performed. The mixture is advanced to the outlet section 230 at a relatively high moving speed and discharged to a conveying means such as a belt conveyor, and the mixture to be subjected to the volatilization process is sequentially transferred from the inlet section 220 to the air contact processing section 210 (cylindrical section 211). ).

  By repeating such treatment, even oils and the like that are relatively difficult to volatilize can be volatilized well and the soil can be purified efficiently and reliably.

  The predetermined inclination angle A can be automatically changed at a predetermined timing via an electric motor or the like, or can be changed manually by an operator as appropriate.

  By the way, also in the second embodiment, as in the first embodiment, the cylindrical portion 211, the inlet portion so that oils etc. that have volatilized in the cylindrical portion 211 and a strange odor generated at the time of volatilization do not leak to the outside. 220, the internal space of the outlet 230 can be sucked by a suction means 250 such as a blower to recover the volatile oils and the off-flavors generated during the volatilization. For example, it can be recovered by being adsorbed by a recovery means 240 such as activated carbon. As shown in FIG. 1, the flow of air in the internal space generated by the suction of the suction means 250 is in the direction opposite to the direction in which the mixture is carried out. This is preferable from the viewpoint of prevention.

  However, as described above, the cylindrical portion 211 is kept horizontal for a predetermined period so that it can be volatilized well even with oils that are relatively difficult to volatilize, and the soil can be purified efficiently and reliably. When volatilizing oil or the like, there is little risk of re-adsorption to the mixture side of the oil or the like described above. Therefore, a recovery passageway 260 that connects the internal space with the recovery means 240 and the suction means 250. Can also be arranged as shown in FIG.

  By the way, it is also possible to use a suction negative pressure by the suction means 250 to supply a chemical for deodorization and deodorization from the deodorizer addition device 300 into the internal space.

  As described above, in the second embodiment, soil contaminated with oils and the like is uniformly mixed with a volatilization promoting substance while being sufficiently finely divided, and an exothermic reaction caused by this mixing is utilized. It effectively purifies contaminated soil by volatilizing oil contained in contaminated soil, but is suitable for volatilizing oil etc. when volatilizing oil contained in contaminated soil In order to provide a stable environment, air contact treatment is performed on a mixture of contaminated soil and a volatilization promoting substance so as to contact not only the surface but also the inside.

  According to this embodiment in which such air contact treatment is performed, volatilization can be promoted even with oils and the like that are relatively less volatile than conventional ones, so that contaminated soil can be more quickly and reliably obtained. Can be purified.

In addition, by configuring the air contact processing device 200 according to the present embodiment in a compact manner, it is possible to remove the oils and the like on site by bringing the device into the site.
In addition, according to the present embodiment, the space related to the treatment and temporary storage of contaminated soil can be omitted, and the surroundings of the soil to be treated are temporarily installed so that volatilized oils and the like are not scattered into the atmosphere. Compared with a method in which the air in the temporary tent is sucked through a blower or the like after being surrounded by a tent or the like, and volatilized oil in the temporary tent is recovered, the work environment is improved, Shortening and cost reduction can be achieved.

  In addition, the structure which makes the said predetermined inclination-angle A demonstrated in this Embodiment variable is applicable also to 1st Embodiment.

1 is a diagram schematically showing an overall configuration of a first embodiment according to the present invention. (A) is a side view which shows the structural example of the atomization mixing apparatus which concerns on embodiment same as the above, (B) is sectional drawing of the container 21 shown by (A). It is a perspective view of the cylindrical part which concerns on embodiment same as the above. It is the figure which looked at the cylindrical part which concerns on embodiment same as the above from the rotating shaft direction. It is a perspective view which shows another example of the cylindrical part which concerns on embodiment same as the above. It is a figure which shows schematically the whole structure of 2nd Embodiment which concerns on this invention. It is a figure which shows an example of the conventional soil purification apparatus.

Explanation of symbols

100 Fine-grain mixing device (corresponding to the mixing means according to the present invention)
200 Air contact treatment device (corresponding to aeration means according to the present invention)
210 Air contact processing part 211 Cylindrical part 212 Projection part 220 Inlet part 230 Outlet part 240 Recovery means (activated carbon etc.)
250 Suction means (blower, etc.)
260 Recovery passage 300 Deodorant addition device 310 Supply passage

Claims (11)

A solid substance mixed with a volatile substance is mixed with a volatilization promoting substance that promotes volatilization by achieving a desired temperature condition, and the volatile substance mixed in the solid substance is volatilized and removed. A method for removing volatile substances,
A finely divided mixing step of mixing the solid substance mixed with the volatile substance and the volatilization promoting substance into a predetermined finely divided state by a cutting blade rotated at high speed;
An aeration treatment step for carrying out an aeration treatment in which the mixture of the solid substance mixed with the volatile substance and the volatilization promoting substance is exposed to an unsaturated atmosphere;
A volatile substance removing method comprising:   The volatile substance removing method according to claim 1, wherein the aeration process includes a process of dropping all or part of the mixture from a predetermined height.   The volatile substance removing method according to claim 1, wherein the aeration process includes a process of dropping a part of the mixture from a predetermined height after separating a part of the mixture from another part.   The volatile substance removing method according to claim 3, wherein a part of the mixture is mixed with the other part after being dropped from a predetermined height.   The volatile substance removing method according to any one of claims 1 to 4, wherein the aeration process is performed in the container using a rotating operation of the rotating container.   The volatile substance removing method according to claim 5, wherein the mixture is discharged from the container by using an inclination of the rotating container.   The volatile substance removing method according to claim 6, wherein an inclination angle of the rotating container is variably set.   The volatile substance removing method according to any one of claims 1 to 7, wherein the volatile substance is removed while collecting the volatile substance that has volatilized.   The method for removing a volatile substance according to any one of claims 1 to 8, wherein a substance for extinguishing an odor generated from the volatile substance is added.   The volatile substance removing method according to claim 1, wherein the volatile substance is an oil. A solid substance mixed with a volatile substance is mixed with a volatilization promoting substance that promotes volatilization by achieving a desired temperature condition, and the volatile substance mixed in the solid substance is volatilized and removed. A volatile substance removal device comprising:
A mixing means for mixing the solid substance mixed with the volatile substance and the volatilization promoting substance into a predetermined finely divided state by a cutting blade rotated at high speed;
An aeration means for performing an aeration process in which the mixture of the solid substance mixed with the volatile substance and the volatilization promoting substance is exposed to an unsaturated atmosphere;
A volatile substance removing device comprising