JP2008279310A - Treatment device of solid containing noxious substance such as organic halogen compound - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a treatment device, of a solid containing a noxious substance such as organic halogen, which can treat by decomposition the noxious substance such as organic halogen compound contained in an exhaust gas generated in an enclosure by the heating of a microwave. <P>SOLUTION: This treatment device 1 of the solid containing the noxious substance such as organic halogen compound is provided with: the enclosure 30, into which the solid containing the noxious substance such as organic halogen compound, is introduced; and a microwave irradiation mechanism 31 which irradiates the solid containing the noxious substance introduced into the enclosure 30 with microwaves. An ultraviolet irradiation mechanism 2 is arranged inside the enclosure 30. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a solid processing apparatus containing a toxic substance such as an organic halogen compound, and in particular, by irradiating a solid containing a toxic substance such as an organic halogen compound with microwaves, the toxic substance such as an organic halogen compound is removed. The present invention relates to a solid processing apparatus containing a harmful substance such as an organic halogen compound that is decomposed.

  Dust collection ash discharged from municipal waste incinerators and electric furnaces and collected by dust collectors contains harmful substances such as organic halogen compounds such as dioxins. Ashes were solidified by an ash solidifying device or the like to prevent elution of harmful substances such as organic halogen compounds, and then were subjected to treatment such as landfilling.

  On the other hand, for the purpose of minimizing the adverse effects of dioxins on the human body, in December 2002, “Ministerial Ordinance on Standards and Measurement Methods for the Amount of Dioxins Contained in Soot and Dust in Waste Incinerators” Since 1st, there is a restriction on the concentration of dioxins contained in dust collection ash to be 3 nanograms or less per gram of dust collection ash, and measures to remove dioxins from dust collection ash It became necessary to apply.

  In order to comply with this regulation, the dust collection ash is heated in an oxygen-deficient state at 350 ° C. or higher, preferably 400 ° C. or higher for 30 minutes or longer, and further heated to 200 ° C. or lower after heating to prevent resynthesis. It has been proposed and put to practical use a method of cooling or decomposing harmful substances such as organic halogen compounds such as dioxins by irradiating microwaves to dust collection ash (for example, Patent Documents 1 to 3). reference).

The present applicant has previously proposed a solid processing apparatus containing a harmful substance such as an organic halogen compound in Japanese Patent Application No. 2005-353936.
As shown in FIG. 3, this solid processing apparatus containing a harmful substance such as an organic halogen compound has a casing for introducing a solid containing a harmful substance such as an organic halogen compound (hereinafter referred to as “pollutant”). 30 and a microwave processing device 3 provided with a microwave irradiation mechanism 31 for irradiating a solid containing a harmful substance introduced into the housing 30 with a microwave. Contaminants discharged from a dust collector or the like are transferred by the transport device 4 and introduced into the housing 30 from the discharge port 4a through the introduction port 3a disposed in the upper portion of the housing 30. Then, microwaves are irradiated from a microwave irradiation mechanism 31 disposed at an appropriate position of the housing 30 to perform decomposition processing of harmful substances such as dehalogenation reaction of organic halogen compounds contained in the pollutants. Thereafter, the contaminants treated by the transport device 5 are discharged through the discharge port 3b disposed in the lower portion of the housing 30. In this case, since the planar cross-sectional shape of the peripheral wall of the upper half of the housing 30 is formed to be a pentagon or more polygon, the microwaves reflected by the inner wall surface of the housing 30 are concentrated on a specific location. And there is an advantage that the microwave can be uniformly irradiated to the pollutant.

  By the way, when the microwave irradiation mechanism 31 irradiates the microwave, the moisture contained in the pollutant is heated by the microwave and is evaporated in the state containing the harmful substance in the housing 30 to become an exhaust gas to be an exhaust pipe. 6 is discharged to the outside of the housing 30 via 6. In general, the microwave treatment method is not suitable for decomposing harmful substances such as organic halogen compounds contained in gas or water. For this reason, harmful substances such as organic halogen compounds contained in evaporated exhaust gas are discharged. Adsorption treatment is performed by a filter 61 such as a ceramic filter disposed in the pipe 6 or an activated carbon filter provided on the downstream side of the discharge pipe 6.

However, when the pollutants to be treated are soils with high moisture content, rivers, bottom sediments, etc., the moisture content is a value of several tens of percent. In addition to the problem that much energy is consumed for evaporation of residual moisture as described above, the amount of exhaust gas generated by microwave heating increases, and the filter 61, activated carbon filter, etc. There was a problem that the adsorption treatment could not be performed and exhaust gas treatment could not be performed sufficiently.
Further, depending on the filter 61, the activated carbon filter, etc., only harmful substances such as organic halogen compounds are adsorbed, and these harmful substances cannot be decomposed.

In addition, it has also been proposed to decompose harmful substances such as organic halogen compounds with ultraviolet rays (see, for example, Patent Documents 4 to 5), but these all treat harmful substances such as organic halogen compounds alone. However, it was unrelated to the solid processing apparatus containing harmful substances such as organic halogen compounds.
JP 2000-334062 A JP 2001-19646 A JP 2005-169291 A Japanese Patent No. 3461312 JP 2004-321917 A

  The present invention decomposes harmful substances such as organic halogen compounds contained in the exhaust gas generated in the case by microwave heating in view of the problems of the solid processing apparatus containing the harmful substances such as organic halogen compounds. An object of the present invention is to provide a solid processing apparatus containing a toxic substance such as an organic halogen compound that can be processed.

  In order to achieve the above object, a solid processing apparatus containing a harmful substance such as an organic halogen compound according to the present invention has a casing for introducing a solid containing a harmful substance such as an organic halogen compound, and the casing is introduced into the casing. In a solid processing apparatus containing a toxic substance such as an organic halogen compound provided with a microwave irradiation mechanism for irradiating a solid containing a toxic substance with microwaves, an ultraviolet irradiation mechanism is provided in the housing. To do.

  In this case, the ultraviolet irradiation mechanism can be disposed in a discharge pipe that discharges exhaust gas generated in the housing.

  Further, an electrodeless lamp can be used for the ultraviolet irradiation mechanism.

  The solid processing apparatus containing a harmful substance such as an organic halogen compound according to the present invention has an ultraviolet irradiation mechanism disposed in the housing, and the housing is irradiated with ultraviolet rays, so that it is difficult to decompose by microwaves. In addition to being able to be decomposed by ultraviolet rays, harmful substances such as organic halogen compounds adhering to the surface of the solid can be decomposed.

  In addition, by disposing the ultraviolet irradiation mechanism inside the exhaust pipe that discharges the exhaust gas generated in the housing, the exhaust gas discharged outside the housing can be effectively detoxified, and the ultraviolet irradiation mechanism can be It can be disposed at a relatively low temperature position in the casing that becomes high temperature due to heating due to heat, and deterioration or failure of the ultraviolet irradiation mechanism due to heat can be prevented.

  In addition, by using an electrodeless lamp for the ultraviolet irradiation mechanism, it is possible to generate ultraviolet rays by an electromagnetic field generated by microwaves radiated in the housing, and there is no need to provide a separate power supply facility for the ultraviolet irradiation mechanism. The cost of the apparatus can be reduced.

  Embodiments of a solid processing apparatus containing harmful substances such as organic halogen compounds according to the present invention will be described below with reference to the drawings.

  1 to 2 show an embodiment of a solid processing apparatus containing a harmful substance such as an organic halogen compound of the present invention. In addition, about the structure similar to the processing apparatus shown in FIG. 3, the same code | symbol and a series of code | symbol are attached | subjected, and description is abbreviate | omitted.

  The solid processing apparatus 1 containing a toxic substance such as an organic halogen compound is introduced into the case 30 configured as a sealed container for introducing a solid containing a toxic substance such as an organic halogen compound. The microwave processing apparatus 3 includes a microwave irradiation mechanism 31 that irradiates a contaminant with microwaves. The housing 30 is further provided with an ultraviolet irradiation mechanism 2.

The casing 30 is not particularly specified in shape, but the planar cross-sectional shape of the peripheral wall of the upper half of the casing 30 constituting the microwave irradiation space above the contaminant introduced into the casing 30 is not particularly specified. It is made to form in the polygon more than a pentagon.
Thereby, the microwave reflected by the inner wall surface of the peripheral wall of the upper half of the housing 30 does not concentrate on a specific place, and the microwave can be uniformly irradiated to the contaminant that is the processing target.

  In addition, the microwave processing device 3 is provided with a transport device 4 for carrying contaminants into the housing 30 and a transport device 5 for discharging the treated contaminants.

In this case, the ultraviolet irradiation mechanism 2 can widely use conventionally known ultraviolet irradiation mechanisms, and the configuration thereof is not particularly limited. In addition to the ultraviolet irradiation mechanism using a normal electrode-equipped lamp, An ultraviolet irradiation mechanism using the electrodeless lamp 20 can be used.
If the electrodeless lamp 20 is configured so that mercury or xenon is sealed inside and ultraviolet rays are generated by exciting the mercury vapor in the electromagnetic field irradiation field, the component of the gas sealed inside is as follows. There is no particular limitation.
In the present embodiment, ultraviolet rays can be generated from the ultraviolet irradiation mechanism using the electrodeless lamp 20 without providing a separate power supply facility by the microwaves irradiated from the microwave irradiation mechanism 31.

The location of the ultraviolet irradiation mechanism 2 is preferably the inner wall surface above the housing 30 and is attached so as not to interfere with the irradiation port of the microwave irradiation mechanism 31.
In this embodiment, it is arranged on the inner wall surface above the housing 30 and in the discharge pipe 6 for discharging the exhaust gas generated in the housing 30.

The discharge pipe 6 is divided into a clean space 62a and a contaminated space 62b by a partition wall 62, and a filter 61 (for example, a ceramic filter) suspended from the partition wall 62 by sucking exhaust gas generated in the housing 30 by a suction fan F. By exhausting the ultraviolet irradiation mechanism 2 on the inner wall 6a of the polluted space 62b of the discharge pipe 6, exhaust gas containing harmful substances such as dioxins and other organic halogen compounds is purified. Is irradiated with ultraviolet rays to decompose harmful substances and release them through the filter 61 to the atmosphere.
The filter 61 is activated by the microwave irradiated from the microwave irradiation mechanism 31 and arranges a catalyst that decomposes harmful substances such as organic halogen compounds, thereby removing dust and adsorbing and decomposing harmful substances. What was made can also be used.

  As shown in FIG. 2, the location of the ultraviolet irradiation mechanism 2 on the inner wall 6a is preferably a location protruding to the housing 30, and the protruding portion 6b of the discharge pipe 6 to the housing 30 is, for example, quartz glass. It is preferable to use a material that allows microwaves to pass through. The entire protruding portion 6b is made of the material, and the protruding portion 6b can be provided with a frame and fitted with a quartz glass plate.

  When processing solid soil, rivers, seabed sediments, etc. with a high water content using the solid processing apparatus 1 containing harmful substances such as organic halogen compounds, first, the water content of the pollutant to be treated is a predetermined value. In order to make the following, the moisture content is reduced by a filter press (not shown) or the like and introduced into the housing 30 by the transfer device 4.

Then, a microwave is irradiated from a microwave irradiation mechanism 31 disposed at a proper position of the housing 30 to perform a decomposition process of harmful substances such as a dehalogenation reaction of an organic halogen compound contained in the pollutant.
At this time, the moisture contained in the pollutant having a high moisture content evaporates due to the heating of the microwave, and the casing 30 is filled with exhaust gas.
The exhaust gas contains harmful substances such as dioxins and other organic halogen compounds, but the harmful substances are decomposed by ultraviolet rays generated by the ultraviolet irradiation mechanism 2.
Further, harmful substances remaining in the exhaust gas guided to the exhaust pipe 6 by the suction fan F (the same applies when the suction fan F is not provided) are generated by the ultraviolet irradiation mechanism 2 provided on the inner wall 6 a of the exhaust pipe 6. It is decomposed by ultraviolet rays and is released to the atmosphere through the filter 61.

  In addition, the contaminants carried into the housing 30 are decomposed by the ultraviolet rays generated by the ultraviolet irradiation mechanism 2 along with the decomposition treatment by the microwave irradiation and the harmful substances adhering to the surface thereof.

  Then, after the processing for a predetermined time is completed, the contaminants processed by the transport device 5 are discharged through the discharge port 3b disposed in the lower portion of the housing 30.

  As mentioned above, although the solid processing apparatus containing harmful substances, such as an organic halogen compound of the present invention, was explained based on the example, the present invention is not limited to the composition described in the above example, The configuration can be changed as appropriate without departing from the spirit of the invention.

  The method for treating a solid containing a toxic substance such as an organic halogen compound of the present invention and its treatment apparatus can decompose the toxic substance such as an organic halogen compound contained in exhaust gas generated in the casing by heating with microwaves. Therefore, it can be suitably used for the treatment of pollutants containing harmful substances such as organic halogen compounds such as dioxins, especially soils with high water content, river and seabed sediments, etc. .

It is explanatory drawing which shows one Example of the processing apparatus of the solid containing harmful substances, such as the organic halogen compound of this invention. It is a front view of the partial cross section of the housing | casing explaining the arrangement | positioning location of an ultraviolet irradiation mechanism. It is explanatory drawing of the solid processing apparatus containing harmful substances, such as an organic halogen compound which the present applicant proposed previously.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Solid processing apparatus containing harmful substances, such as an organic halogen compound 2 Ultraviolet irradiation mechanism 20 Electrodeless lamp 3 Microwave processing apparatus 30 Housing | casing 31 Microwave irradiation mechanism 4 Conveyance apparatus 5 Conveyance apparatus 6 Exhaust pipe

Claims (3)

  Hazardous organic halogen compounds and the like equipped with a case for introducing a solid containing a harmful substance such as an organic halogen compound and a microwave irradiation mechanism for irradiating the solid containing the harmful substance introduced into the case with a microwave A solid processing apparatus containing a hazardous substance such as an organic halogen compound, wherein a solid-state processing apparatus containing a substance is provided with an ultraviolet irradiation mechanism in a housing.   2. The apparatus for treating a solid containing a harmful substance such as an organic halogen compound according to claim 1, wherein the ultraviolet irradiation mechanism is disposed in a discharge pipe for discharging exhaust gas generated in the housing.   3. The solid processing apparatus containing a harmful substance such as an organic halogen compound according to claim 1, wherein the ultraviolet irradiation mechanism is an electrodeless lamp.

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