JP4509700B2 - Exhaust gas treatment method and exhaust gas treatment equipment - Google Patents

Description

  The present invention relates to an exhaust gas treatment method and an exhaust gas treatment facility, and more particularly to an exhaust gas treatment method and an exhaust gas treatment facility that are suitable for exhaust gas discharged when an object to be treated contaminated with an organic halogen compound is heated.

Conventionally, various methods have been proposed for detoxifying solid substances contaminated with organic halogen compounds such as dioxin and polychlorinated biphenyl (PCB).
For example, in Patent Document 1, exhaust gas discharged by heat treatment of an object to be treated (for example, soil) contaminated with an organic halogen compound is cleaned by an oil cleaning gas cleaning device, and then adsorbed by activated carbon. A method of cleaning by performing is disclosed.

  This oil-cleaning type gas cleaning device uses a method in which cleaning oil such as hydrocarbon oil is sprayed in high-temperature exhaust gas (dispersion type) or a method in which exhaust gas is aerated in cleaning oil (aeration method in oil). The organic halogen compound contained in the exhaust gas is removed by dispersing or dissolving the organic halogen compound in the hydrocarbon oil.

  The used cleaning oil is rendered harmless by, for example, decomposing the organic halogen compound using an alkali metal dispersion or the like.

However, such a conventional oil cleaning type gas cleaning device has the following problems.
That is, when the organic halogen compound is removed from the used cleaning oil, it is necessary to bring the cleaning oil into contact with the alkali metal dispersion. When the amount of the cleaning oil is increased, the organic halogen compound and the alkali are efficiently used. It becomes difficult to contact the metal dispersion.
In addition, in some cases, a large amount of moisture evaporated from the object to be processed in the heat treatment is contained in the exhaust gas, and when the water mixed with the cleaning oil is treated together with the cleaning oil, the water reacts with the alkali metal dispersion. , Waste of the alkali metal dispersion, or the decomposition treatment of the organic halogen compound.
In addition, when water is separated from the cleaning oil in order to prevent the reaction between water and the alkali metal dispersion, it is necessary to purify the separated water with activated carbon or the like, and the treatment cost increases when the amount of water in the exhaust gas increases. There arises a problem of incurring an increase in.
Japanese Patent Laid-Open No. 2003-225643

  Therefore, in view of the problems of the prior art as described above, the present invention provides an oil cleaning type gas cleaning process for exhaust gas discharged by heat processing of an object contaminated with an organic halogen compound. One object is to efficiently detoxify the cleaning oil used in the oil cleaning gas cleaning process.

In order to solve the above-mentioned problems, the present invention is a method for treating exhaust gas generated when heat treating a pollutant contaminated with an organic halogen compound, wherein the exhaust gas and cleaning oil are brought into contact with each other and the organohalogen compound in the exhaust gas is contacted. An oil-cleaning gas cleaning step for removing water, an oil-water separation step for separating the cleaning oil used in the oil-cleaning gas cleaning step into oil and water, and distilling the separated oil to obtain a first distillate The first distillation step for separating the water discharged as the first discharged liquid and the oil discharged as the first bottom liquid , the first distillate separated in the first distillation step, and the oil-water separation step A second distillation step of distilling the collected water into water discharged as a second distillate and oil discharged as a second bottom liquid , and included in the first bottom liquid An exhaust gas treatment method characterized by detoxifying an organic halogen compound To provide.

Further, the present invention provides the exhaust gas treatment method, wherein the first bottoms separated in the first distillation step is further distilled to obtain an oil having a low content of an organic halogen compound as a third distillate , A third distillation step for separating into three cans as an oil having a high content of an organic halogen compound, and the third distillate is reused as a cleaning oil in the oil cleaning type gas cleaning step; There is provided an exhaust gas treatment method characterized by detoxifying an organic halogen compound contained in a bottoms.
Further, the present invention provides the exhaust gas treatment method, wherein in the exhaust gas treatment method, at least a part of the second bottomed liquid is returned to the first distillation step. The present invention also provides an exhaust gas treatment method, wherein in the exhaust gas treatment method, at least a part of the second bottom liquid is reused as cleaning oil in the oil cleaning gas cleaning step.

Furthermore, the present invention is a treatment facility for exhaust gas generated when heat treating a pollutant contaminated with an organic halogen compound, and is an oil cleaning system that removes the organic halogen compound in the exhaust gas by bringing the exhaust gas into contact with the cleaning oil. Gas cleaning device, an oil / water separator for separating the cleaning oil used in the oil cleaning gas cleaning device into oil and water, and water discharged as a first distillate by distilling the separated oil And a first distillation apparatus that separates the oil discharged as the first bottom liquid, a first distillate separated by the first distillation apparatus, and water separated by the oil-water separation apparatus. A second distillation apparatus that separates water discharged as a second distillate and oil discharged as a second bottoms, and an organic halogen compound contained in the first bottoms Exhaust gas treatment characterized by being detoxified To provide the equipment.
In the exhaust gas treatment facility, the present invention provides an oil having a low content of an organic halogen compound as a third distillate by distilling the first bottoms separated by the first distillation apparatus , A third distillation device for separating into an oil having a high content of an organic halogen compound as a bottoms, wherein the third distillate is reused as a cleaning oil in the oil cleaning type gas cleaning device; Provided is an exhaust gas treatment facility characterized in that an organic halogen compound contained in a effluent is detoxified.

  According to the exhaust gas treatment method and the treatment facility according to the present invention, the cleaning oil used in the oil cleaning type gas cleaning step is first separated into oil and water by oil-water separation to remove moisture from the cleaning oil. The consumption of alkali metal can be reduced. Further, since the separated water is further distilled by the second distillation step and recovered as the second distillate, it becomes water with a very low content of organic halogen compounds, simplifying subsequent processing such as activated carbon adsorption. be able to.

  On the other hand, since the oil separated by the oil-water separation is separated into the first distillate and the first bottoms by the first distillation step, the oil separated by the oil-water separation contains a relatively large amount of water. Even in such a case, since the water is separated as the first distillate, the separated first bottom liquid contains almost no water. Further, the water separated as the first distillate is further treated by the second distillation step together with the water separated by the oil-water separation, and discharged as water having a very low content of organic halogen compounds.

  When the first distillate is further separated into the third distillate and the third distillate by the third distillation step, the separated third distillate has a low content of organic halogen compound. Since it is oil, it can be suitably reused as cleaning oil in the oil cleaning type gas cleaning process. Moreover, since the separated 3rd bottom liquid is oil with much content of an organic halogen compound, the harmless process of the organic halogen compound using an alkali metal can be performed efficiently.

Thus, according to the exhaust gas treatment method and the exhaust gas treatment facility of the present invention, water and oil contained in the cleaning oil can be separated and recovered with high purity, respectively, and the third distillation step is provided. Can be recovered in a state where the organic halogen compound is concentrated in oil.
Moreover, water and oil separated by oil-water separation are each processed in a plurality of mutually related distillation steps, so that energy loss as a whole is reduced, and processing costs can be reduced. .

  As described above, according to the present invention, the exhaust gas discharged by the heat treatment of the object contaminated with the organic halogen compound is efficiently detoxified by the oil cleaning type gas cleaning processing using the cleaning oil. It becomes possible to do.

Hereinafter, embodiments of the present invention will be described.
FIG. 1 is a schematic flow diagram showing an embodiment of an exhaust gas treatment facility according to the present invention. As shown in FIG. 1, the treatment facility 1 of the present embodiment includes a heat treatment device 2 (heat treatment step) for heating and treating a pollutant A contaminated with an organic halogen compound, and discharging from the heat treatment device 2. A dust collector 3 (dust collecting step) for removing dust in the exhaust gas B, an oil cleaning gas cleaning device 4 (oil cleaning gas cleaning step) for absorbing the organic halogen compound in the exhaust gas into the cleaning oil, An oil / water separator 5 (oil-water separation step) that separates the cleaning oil that has absorbed the organic halogen compound into water and oil, and the separated water and oil are distilled to obtain high-purity water, high-purity oil, and organic First to third distillation apparatuses (first to third distillation steps) for separating the halogen compound concentrated oil, and an alkali metal treatment unit 9 (alkali for decomposing the organic halogen compound in the organic halogen compound concentrated oil with an alkali metal. Metal processing Made with a degree) and.

The heat treatment apparatus 2 in the present embodiment includes, for example, a heating furnace that heats the contaminant A inside, and a jacket disposed on the peripheral wall of the heating furnace, and a heat medium supplied to the jacket Thus, the contaminant A can be heated to a desired temperature (for example, 350 to 600 ° C.). Further, when the pollutant A is heated, an inert gas such as nitrogen gas is supplied so that the inside of the heating furnace has a reducing atmosphere.
In addition, the heat treatment apparatus 2 includes an oxidation treatment unit that introduces and heats an oxidizing atmosphere (air) to the front part of the heat treatment apparatus in order to perform an oxidation treatment of the organic compound when the contaminant includes an organic compound, A configuration may be employed in which oxidation treatment is performed at the front stage of the heat treatment apparatus and reduction treatment is performed at the rear stage.

  As the dust collector 3, for example, a high-temperature cyclone that collects and removes dust in the exhaust gas B generated by the heat treatment device 2 by centrifugal force, and dust in the exhaust gas that has passed through the high-temperature cyclone is removed by filtration. A high-temperature bag filter is used.

Further, the oil cleaning type gas cleaning device 4 is not particularly limited as long as it removes the organic halogen compound in the exhaust gas by bringing the exhaust gas B and the cleaning oil into contact with each other. Sprayed gas cleaning method (packed tower method) configured to spray and make cleaning oil and exhaust gas contact counter-current gas-liquid, and exhaust gas is aerated from a thin nozzle in the cleaning oil as well. It is possible to employ an aeration-in-oil cleaning system or the like that is configured so as to make it happen. Other examples include a rotoclon system, an ejector system, a rotary spray tower system, and a venturi system. A suitable cleaning method is the oil spray type gas cleaning system as shown in FIG.
The cleaning oil may be any as long as it can dissolve the organic halogen compound in the exhaust gas. For example, hydrocarbon oils such as trans oil, kerosene, and normal paraffin oil can be suitably used. . In particular, when the difference in boiling point from the organic halogen compound to be removed is larger, the cleaning oil and the organic halogen compound can be easily separated by distillation. In addition, when the boiling point of the cleaning oil is lower than that of water, it becomes difficult to separate water and oil by distillation. Therefore, a hydrocarbon solvent having 8 to 15 carbon atoms is preferable, and a hydrocarbon solvent having 10 to 12 carbon atoms. Is more preferable.
In particular, when an organic halogen compound is detoxified using an alkali metal, it is preferable to use normal paraffin from the viewpoint that it does not react with the alkali metal, is inexpensive and easily dissolves the organic halogen compound.
Furthermore, in this embodiment, the activated carbon treatment device 15 for further purifying the exhaust gas B treated by the oil cleaning type gas cleaning device 4 is provided.

As the oil-water separator 5, the used cleaning oil is allowed to stand to separate into water and oil by utilizing the difference in specific gravity, and water having a large specific gravity is discharged from the lower side of the device. What was comprised so that small oil could be discharged | emitted from the upper side of this apparatus can be used conveniently.
Moreover, although the independent oil-water separation apparatus 5 may be provided like this embodiment, it is also possible to make the lower part of the said oil-cleaning type gas cleaning apparatus 4 function as an oil-water separation apparatus.

  More specifically, the first to third distillation apparatuses (first to third distillation steps) distill the oil separated by the oil / water separation apparatus to obtain the first distillate C and the first distillate. A first distillation device 6 (first distillation step) that separates into bottoms D, a first distillate C separated by the first distillation device, and water separated by the oil-water separator. The first distillate separated by the second distillation apparatus 7 (second distillation step) and the first distillation apparatus 6 to separate the second distillate E and the second distillate F from the distillate. It comprises a third distillation device 8 (third distillation step) that distills D and separates it into a third distillate G and a third bottoms H.

The 1st distillation apparatus 6 makes the oil isolate | separated by the oil-water separation apparatus 5 into a process target, and mainly isolate | separates the water contained in this oil from oil. Therefore, the water having a lower boiling point than the oil is discharged as the first distillate C, and the oil is discharged as the first bottom liquid D.
The specific configuration of the first distillation apparatus 6 may be any of simple distillation or rectification. In addition, the conditions such as the heating temperature, pressure, and reflux ratio in the first distillation apparatus 6 can be appropriately set according to the type of cleaning oil used, the amount of water transferred from the exhaust gas to the cleaning oil, and the like. it can.

  For example, moisture can be separated at 70 to 80 ° C. by reducing the pressure during distillation to 350 to 450 kPa. In addition, such treatment can remove highly volatile organic compounds among the organic halogen compounds. Examples of the highly volatile organic compound include volatile organic substances (VOC) such as trichloroethylene, tetrachloroethylene, and chlorobenzene. These volatile organic substances (VOC) can be adsorbed with activated carbon together with water removed by vacuum distillation.

The second distillation apparatus 7 treats the water separated by the oil / water separation apparatus 5 and mainly separates the oil and the organic halogen compound contained in the water from the water. Accordingly, the oil and the organic halogen compound having a boiling point higher than that of water are discharged as the second bottoms F, and the water is discharged as the second distillate E.
As for the specific configuration of the second distillation apparatus 7, any of simple distillation or rectification can be employed. As in the first distillation apparatus 6, the second distillation apparatus 7 also has conditions such as heating temperature, pressure, and reflux ratio, the type of cleaning oil, the amount of water transferred from the exhaust gas to the cleaning oil, and the organic content. It can be appropriately set according to the concentration of the halogen compound.

  The second bottoms F discharged from the second distillation unit 7 may be returned to the first distillation unit 6, and oil washed together with the third distillate G discharged from the third distillation unit 8. It may be reused as cleaning oil for the gas type gas cleaning device 4.

The third distillation apparatus 8 treats the oil (first bottomed liquid D) separated by the first distillation apparatus 6 and mainly concentrates the organic halogen compound contained in the oil. Accordingly, an organic halogen compound having a boiling point higher than that of oil is discharged as a third bottoms H in a state of being concentrated in the oil, and an oil containing almost no organic halogen compound is discharged as a third distillate G. It is configured as follows.
As for the specific configuration of the third distillation apparatus 8, either single distillation or rectification can be employed. In addition, in the third distillation apparatus 8 as in the first distillation apparatus 6, conditions such as heating temperature, pressure, and reflux ratio are appropriately set according to the type of cleaning oil, the concentration of the organic halogen compound, and the like. can do.

The third distillate G, that is, oil containing almost no organic halogen compound is returned to the oil cleaning gas cleaning device 4 and reused as cleaning oil.
On the other hand, the third bottom H, that is, the oil containing the concentrated organic halogen compound is sent to the alkali metal treatment unit 9.

  The alkali metal treatment unit 9 (alkali metal treatment step) includes a dehalogenation reaction tank 10 that decomposes an organic halogen compound concentrated in oil with an alkali metal (for example, a dispersion of metal sodium or the like), and the reaction tank 10. The neutralization / stationary separation tank 11 that neutralizes the alkali metal (for example, metallic sodium) that has not been consumed in step 1 and separates the water layer and the oil layer, and further, the gas generated from the reaction tank 10 is treated. And an activated carbon treatment device 12 for this purpose.

Next, an exhaust gas treatment method when the treatment equipment having such a configuration is used will be described.
The pollutant A contaminated with the organic halogen compound to be treated by the heat treatment apparatus 2 is a liquid or solid substance containing the organic halogen compound. Examples of the pollutant A are leachate generated in waste treatment plants, incineration facilities, factories, etc., smoke drainage, waste, cleaning wastewater, contaminated soil, rivers, lakes, ponds, and the bottom of bays. Sludge (sediment sludge, sludge, etc.), soil contaminated with agricultural chemicals, and the like. Examples of the organic halogen compound include dioxin, polychlorinated biphenyl, benzhexachloride, aldrin, and the like.

The pollutant A is supplied to the heat treatment apparatus 2, and an inert gas such as nitrogen gas or argon gas or hydrogen gas is introduced into the apparatus, and the oxygen concentration is 3% or less, preferably 1% or less. In such a reducing atmosphere, heating is performed at a temperature of 350 to 600 ° C, preferably 400 to 600 ° C, more preferably 450 to 550 ° C.
By performing the reduction treatment at such a temperature, an organic halogen compound such as dioxin or PCB is decomposed or evaporated.

  Further, in the case where the preceding stage part of the heat treatment apparatus 2 is provided with the above-described oxidation treatment part, the contaminant A is heated at a temperature of 350 to 600 ° C. in an oxidizing atmosphere, and mainly an organic compound. Is oxidatively decomposed.

  Thus, exhaust gas B containing an organic halogen compound is generated by heating the pollutant A. The exhaust gas B contains organic volatile substances such as organic halogen compounds and organic halogen decomposition products, water vapor, and the like as gas, and further dust in the form of fine particles.

The exhaust gas B containing the organic halogen compound and fine particle dust discharged from the heat treatment apparatus 2 is sent to the dust collector 3.
During the treatment in the dust collector, the exhaust gas B is preferably heated to a temperature of 100 ° C. or higher, preferably 350 ° C. or higher, thereby preventing the liquefaction of water vapor and the organic halogen compound in the exhaust gas. It can prevent adhering to the dust surface.

The dust collection step in the dust collector is preferably performed in two steps. In the first step, centrifugal dust collection is performed in the temperature range to remove dust having a relatively large particle size (particle size of 2 to 300 μm). Then, in the second step, it is preferable to filter and collect dust within the temperature range to remove the remaining dust.
The device used for the centrifugal dust collection processing is not particularly limited as long as it is a centrifugal dust collection device that uses centrifugal force for dust collection and removal. In addition, a gravity dust collector (for example, a gravity settling chamber), an inertia dust collector, or the like can be used together with or instead of the centrifugal dust collector. An example of the centrifugal dust collector is a high-temperature cyclone. In the second step, for example, a high-temperature bag filter can be used.

The exhaust gas B from which the dust has been removed is sent to the oil cleaning type gas cleaning processing device 4.
In this step, as described above, the exhaust gas B from which dust has been removed is further brought into contact with the cleaning oil, whereby the organic halogen compound in the exhaust gas is removed.

  Exhaust gas B that has passed through the oil cleaning type gas cleaning processing apparatus is further discharged after removal of a very small amount of dust and the like by the activated carbon adsorption tower 15.

On the other hand, the cleaning oil used in the oil cleaning type gas cleaning processing apparatus 4 is separated into water and oil using the difference in specific gravity by being left standing in the oil / water separator 5. The oil is distilled by the first distillation apparatus 6 and separated into a first distillate C mainly composed of water and a first bottom liquid D mainly composed of oil. The first bottom liquid D containing oil as a main component is further distilled by the third distillation apparatus 8 and the third distillate G, which is a clean oil containing almost no organic halogen compound, and a high concentration organic halogen compound. Into a third bottoms H containing
Further, the water separated in the oil / water separator 5 is distilled by the second distillation device 7 into the second distillate E and the second bottoms F, which are clean water containing almost no oil or the like. To be separated.

And the 3rd bottom liquid H containing a high concentration organic halogen compound is sent to the alkali metal processing part 9, and is detoxified by reaction with an alkali metal. The alkali metal remaining in the oil after being detoxified is neutralized in the neutralization / stationary separation tank 11 by adding water separated as the second distillate.
The neutralized oil is separated into oil and water to obtain water and detoxified oil. Water may be discharged out of the system after being subjected to a post treatment such as activated carbon or biological treatment, but may be used again for neutralization. Further, the detoxified oil may be reused as cleaning oil.

  The water separated as the second distillate E can be used for neutralization of alkali metals as described above, and may be discharged out of the system after post-treatment such as activated carbon adsorption. Also,

  Further, since the oil separated as the third distillate G contains almost no organic halogen compound, it should be reused for cleaning exhaust gas in the oil cleaning gas cleaning processing device 4 as described above. Can do.

Thus, according to the exhaust gas treatment method and exhaust gas treatment facility of the present embodiment, water and oil contained in the cleaning oil can be separated and recovered with high purity, respectively, and the organic halogen compound can be contained in the oil. It can be recovered in a concentrated state.
Therefore, the separated and recovered water can be discharged out of the system as a clean water by performing a simple post-treatment, or can be used for other purposes. Can be reused for removing organic halogen compounds from exhaust gas.

  In addition, according to the exhaust gas treatment method and the exhaust gas treatment facility of the present embodiment, water and oil separated by oil-water separation are separated by distillation, respectively, and a part of the bottoms separated by water distillation is partially separated. Since a mutual relationship is formed in which the distillate distilled again in the oil distillation process and distillate separated by the oil distillation is distilled again in the water distillation process, water and oil can be separated with high purity. In addition, the energy loss of the entire process can be reduced, and the exhaust gas treatment cost can be reduced.

Moreover, since water can be removed with high accuracy in advance by the distillation step as described above, wasteful consumption of alkali metal (for example, metal sodium) can be suppressed.
Moreover, since oil and water are separated with high accuracy by the oil / water separator 5 (oil / water separation step) and the second distillation device 7 (second distillation step), cleaning oil containing an organic halogen compound is mixed into the treated water. It can prevent more reliably.

  In this embodiment, the cleaning oil that has absorbed the organic halogen compound is detoxified by dehalogenation treatment using an alkali metal (for example, sodium metal), but as another method, supercritical water oxidation treatment, You may make it harmless by the process using a catalyst, the process using an ultraviolet-ray, etc.

  In addition, since the cleaning oil containing the organic halogen compound is concentrated and desolubilized by distillation, it may be temporarily stored and then collected in another place and detoxified.

  Moreover, although this embodiment demonstrated the case where the three distillation processes were provided, this invention is not limited to this, Two of a 1st distillation process and a 2nd distillation process may be sufficient. In this case, the apparatus becomes simple and the oil after the oil-water separation has an extremely low water content by the first distillation step, and in the detoxification treatment with an alkali metal or the like, there is an advantage that waste of the alkali metal can be prevented. is there. Moreover, if it distills with the water after oil-water separation and the 1st distillate in a 2nd distillation process, the clean water which does not contain oil can be isolate | separated and obtained.

  Further, when the second distillate separated by the second distillation step contains other components other than water or washing oil, the second distillate is further distilled, It is preferable to provide the 4th distillation process for isolate | separating a component. Examples of other components include volatile organic substances (VOC) such as trichloroethylene, tetrachloroethylene, and chlorobenzene.

  The treatment method and treatment facility of the present invention can be employed to render the exhaust gas discharged from a heat treatment apparatus that heat-treats an object contaminated with an organic halogen compound harmless.

FIG. 1 is a process flow diagram showing an embodiment of the processing method of the present invention.

Explanation of symbols

2 Heat treatment device 3 Dust collector 4 Oil cleaning type gas cleaning device 5 Oil / water separation device 6 First distillation device 7 Second distillation device 8 Third distillation device 9 Alkali metal treatment unit 10 Dehalogenation reaction tank 11 Neutralization / static Separation tank 12 Activated carbon treatment device 15 Activated carbon treatment device

Claims (6)

A method for treating exhaust gas generated when heat treating a pollutant contaminated with an organic halogen compound,
An oil cleaning type gas cleaning process for contacting exhaust gas with cleaning oil to remove organic halogen compounds in the exhaust gas;
An oil / water separation step of separating the cleaning oil used in the oil cleaning type gas cleaning step into oil and water;
A first distillation step of distilling the separated oil into water discharged as a first distillate and oil discharged as a first bottoms;
The first distillate separated in the first distillation step and the water separated in the oil / water separation step are distilled to discharge water as a second distillate and a second bottom discharge. and a second distillation step for separating the oil that is,
An exhaust gas treatment method comprising detoxifying an organic halogen compound contained in the first bottoms.
The first bottoms separated in the first distillation step is further distilled to obtain an oil having a low content of organic halogen compounds as the third distillate, and a content of organic halogen compounds as the third bottoms. With a third distillation step that separates the oil
Reusing the third distillate as cleaning oil in the oil cleaning gas cleaning step;
The exhaust gas treatment method according to claim 1, wherein the organic halogen compound contained in the third bottoms is detoxified.
The exhaust gas treatment method according to claim 1 or 2, wherein at least part of the second bottoms is returned to the first distillation step.
The exhaust gas treatment method according to any one of claims 1 to 3, wherein at least a part of the second bottomed liquid is reused as cleaning oil in the oil cleaning type gas cleaning step.
A facility for treating exhaust gas generated when heat treating a pollutant contaminated with an organic halogen compound,
An oil cleaning type gas cleaning device that removes an organic halogen compound in the exhaust gas by bringing the exhaust gas into contact with the cleaning oil;
An oil-water separator for separating the cleaning oil used in the oil-cleaning gas cleaning device into oil and water;
A first distillation apparatus for separating the separated oil into water discharged as a first distillate and oil discharged as a first bottom liquid;
A first distillate separated in said first distillation apparatus, discharged as a water and a second cans exudates discharged as the second distillate by distilling the separated water at the oil-water separation apparatus A second distillation device for separating the oil into
An exhaust gas treatment facility characterized in that the organic halogen compound contained in the first bottoms is detoxified.
The first bottom liquid separated by the first distillation apparatus is further distilled to obtain an oil having a low content of an organic halogen compound as a third distillate, and an organic halogen compound content as a third bottom liquid. comprising a third distillation apparatus for separating and greasy,
The third distillate is reused as cleaning oil for the oil cleaning gas cleaning device,
The exhaust gas treatment facility according to claim 5, wherein the organic halogen compound contained in the third bottoms is detoxified.

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