JP4436078B2 - How to dismantle contaminated facilities - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a dismantling method for dismantling facilities contaminated with dioxins.
[0002]
[Prior art and problems to be solved by the invention]
For example, when dismantling a waste incineration facility (hereinafter simply referred to as an incineration facility), the incineration facility is contaminated with dioxins. It is necessary to take measures to prevent splashing. Therefore, in general, the incineration treatment facility is appropriately divided according to the degree of contamination (dye-proofing zone), and appropriate treatment is performed for each of the anti-dyeing zones, that is, for example, covered with a vinyl sheet (isolation curing), and then The decontamination work is performed, and then the dismantling work is performed.
[0003]
Note that an operator who performs decontamination work and disassembly work performs decontamination work and disassembly work by wearing appropriate protective equipment (protective clothing) in order to prevent contamination by dioxins.
[0004]
The incineration treatment facility dismantling work will be specifically described below. FIG. 1 is a system flow of dismantling work of a conventional incineration processing facility.
[0005]
First, air in an incineration facility to be dismantled and deposits (ash etc.) adhering to the incineration facility are collected and used by a high resolution gas chromatography mass spectrometer (hereinafter referred to as high resolution GC-MS). Dioxins (DXNs in the air and deposits by measurement ) Different Measure the concentration of sex and each isomer.
[0006]
Subsequently, the concentration of each isomer measured by high resolution GC-MS is multiplied by the toxicity coefficient defined for each isomer to obtain the toxic equivalent of each isomer, and the sum of the toxic equivalents is calculated. The total toxic equivalent is calculated, the degree of contamination of the incineration facility is determined based on the total toxic equivalent, and the management level is set according to the degree of contamination. That is, the degree of contamination compartment and isolation curing at the time of decontamination work (for example, which compartment is highly contaminated and must be covered with a vinyl sheet strictly), and protective equipment at the time of decontamination work and dismantling work Specifications (for example, which compartments are highly contaminated and must be worn with protective clothing with a high degree of sealing). Subsequently, on the basis of this management level, a predetermined part of the dye-resistant section is worn with a predetermined protective coat and decontaminated (washed) with high-pressure water to remove dioxins in the section.
[0007]
Subsequently, it is visually confirmed whether or not the deposits in the incineration facility, that is, in each section are cleaned and removed, and after this visual confirmation, the operator sets the protective equipment set based on the above management level. In other words, each section (incineration facility) is dismantled by wearing the same protective clothing as in the contamination work.
[0008]
From the above, dismantling of the incineration treatment facility is performed based on the management level selected according to the degree of contamination obtained by the measurement by the high-resolution GC-MS in advance. Specifically, even after the incineration facility is decontaminated (cleaned), the dismantling work is performed based on the management level set by the measurement by the high resolution GC-MS before cleaning.
[0009]
That is, although the concentration of dioxins was decreased by the cleaning operation compared to before cleaning, the protective equipment (protective clothing) was excessive (heavy equipment), and the area was excessively stained. The incineration facility is being dismantled in this state (this is because the cleaning operation is confirmed visually).
[0010]
Therefore, although decontamination work has achieved cleaning of the incineration facility, protective equipment is unnecessary or significantly lightened, and the isolation curing can be removed or significantly lightened, but with excessive protective equipment and excessive isolation curing. For this reason, for example, because decontamination is sufficient, wearing an airline hose mask is essentially unnecessary. The work efficiency is significantly reduced and the construction period is extended.
[0011]
In addition, if the dismantling work is performed in an excessively decontaminated section, if the construction period is prolonged, a section cost (for example, a temporary curing cost) will be incurred (this temporary curing is very severe if the degree of contamination is high). And very expensive.)
[0012]
In order to solve the above-mentioned problems, after cleaning the incineration facility, the air and deposits in the incineration facility are again measured by high resolution GC-MS to check the degree of contamination again. The management level is reset based on the above, and a method of dismantling the incineration treatment facility that has been slightly isolated and cured, for example, with a slight protective device is also conceivable.
[0013]
However, dioxin Difference When measurement is performed by high-resolution GC-MS that can accurately measure the type and concentration of a sexual substance, it takes a long time (generally about one month) to obtain various isomers and the concentration of the isomer. There is a problem that it takes.
[0014]
Therefore, at present, after the decontamination work, the degree of decontamination is not confirmed by the high resolution GC-MS, but the dismantling work is performed as it is by visual confirmation, so that the excessive decontamination zone state is maintained as it is. It is difficult to say that it is practical because it has to be done and maintenance costs are required.
[0015]
By the way, low resolution GC-MS is known as a device that can easily measure the concentration of dioxins in a short time.
[0016]
However, the measurement of dioxins concentration by this low resolution GC-MS can measure dioxins in a short time compared to the high resolution GC-MS measurement, but since it is low resolution to the last, the MS spectrum is broad, There is a problem that a clear peak cannot be obtained, which makes it very difficult to specify an isomer. Note that the measurement accuracy of this low resolution GC-MS measurement is on the order of 1 pg, which is clearly inferior to the high resolution GC-MS on the order of 0.01 pg.
[0017]
In this low resolution GC-MS, there is a method of using a mass introduction device in order to relatively increase the measurement accuracy to some extent. However, there is a problem that it is unsuitable when a solid sample cannot be collected in large quantities.
[0018]
Similarly, dioxin precursor measurement is known as a method that can easily measure the concentration of dioxins in a relatively short time.
[0019]
This dioxin precursor measurement is a method of measuring the type and concentration of a chlorine compound (precursor) before synthesizing dioxins, and estimating the amount of dioxins generated from the type and concentration of the measured precursor. It is.
[0020]
However, this dioxin precursor measurement only measures the precursor of dioxins, and does not measure the dioxins produced, and therefore has a problem that it cannot be applied to the measurement of facilities that have already been contaminated.
[0021]
Therefore, the measurement by the low resolution GC-MS and the dioxin precursor measurement described above have problems in the measurement accuracy and measurement principle. After all, as in the case where the decontamination confirmation is performed by the measurement by the high resolution GC-MS. It is hard to say that it is practical.
[0022]
The present invention changes the management level based on the degree of contamination of facilities contaminated with dioxins, and performs demolition work based on the changed management level. An object of the present invention is to provide a groundbreaking contamination facility dismantling method that can avoid the situation of dismantling a partitioned incineration processing facility, and thus can efficiently dismantle the incineration processing facility.
[0023]
[Means for Solving the Problems]
The gist of the present invention will be described with reference to the accompanying drawings.
[0024]
Dismantling facilities contaminated with dioxins Pollution facility Dismantling method, contaminated with dioxins Said Measure the dioxin isomers in the facility, then set the management level based on the measured dioxin isomers, perform the decontamination work based on this management level, and then continue the decontamination work The degree of pollution mitigation is identified from the isomers grouped according to the difference in the number of chlorine atoms present in the dioxin isomers, and the isomers group that has a high degree of contribution to pollution is identified. Confirmed by the degree of reduction of dioxin isomers Followed by this confirmation result Change the management level based on the management level, and then change the management level based on the changed management level. Of the facility The present invention relates to a contaminated facility dismantling method characterized by performing dismantling work.
[0025]
The contaminated facility dismantling method according to claim 1, wherein the decontamination work is a water cleaning operation.
[0026]
Moreover, in the contaminated facility dismantling method according to claim 2, water used for the cleaning operation is circulating water, and the circulating water has a high degree of contribution to the contamination. In isomers The present invention relates to a contaminated facility dismantling method characterized in that the content of dioxin isomers is water of a predetermined amount or less.
[0027]
Claims 1 to 3 In the contaminated facility dismantling method according to any one of the above items, the setting of the management level and the change of the management level are setting and changing of specifications of protective equipment for protecting workers from dioxins. It relates to the method of dismantling contaminated facilities.
[0028]
Claims 1 to 3 The contaminated facility dismantling method according to any one of the preceding claims, wherein the setting of the management level and the change of the management level are related to the setting and changing of the work method of the dismantling work, according to the contaminated facility dismantling method. is there.
[0029]
Claims 1 to 5 The contaminated facility dismantling method according to any one of the preceding claims, wherein the facility contaminated with dioxins is a waste incineration facility.
[0030]
Claims 1 to 6 The method for disassembling a contaminated facility according to any one of the preceding claims, wherein the measurement of the dioxin isomers of the facility contaminated with the dioxins is performed by a high-resolution gas chromatography mass spectrometer. It is concerned.
[0031]
[Action and effect of the invention]
Measure the degree of contamination of facilities contaminated with dioxins, then set the management level based on this degree of contamination, and then perform the decontamination work based on this management level. Confirmation of the degree of contamination later is not based on visual observation, but based on the degree of contamination measured before the decontamination work, confirming how much the degree of contamination has been reduced after the decontamination work, and The management level is changed based on the degree of contamination.
[0032]
Therefore, unlike the conventional method, since the set management level is not used until the dismantling operation, the dismantling operation is performed based on the change management level based on the contamination level reduced by the decontamination operation, so that efficient dismantling can be performed.
[0033]
In the present invention, the degree of contamination is determined by measuring dioxin isomers, and the management level is changed based on dioxin isomers having a high degree of contribution to the contamination among the dioxin isomers. Therefore, more efficient dismantling work can be performed.
[0034]
DETAILED DESCRIPTION OF THE INVENTION
The drawings illustrate one embodiment of the present invention and are described below.
[0035]
The present embodiment relates to a dismantling method for dismantling a waste incineration processing facility as a facility contaminated with dioxins.
[0036]
FIG. 2 is a system flow showing the work process of the dismantling method of the waste incineration processing facility of the present embodiment. In the drawing, the isomer distribution characteristic analysis (determination of characteristic isomers) is performed after measurement of dioxins (DXNs) and before setting the management level. This isomer distribution characteristic analysis (determination of characteristic isomers) ) May be performed at any time before confirmation of decontamination (contamination removal work).
[0037]
First, the degree of contamination of a waste incineration treatment facility (hereinafter simply referred to as an incineration treatment facility) is measured (measurement of DXNs in FIG. 2).
[0038]
Specifically, dioxins in the air in the incineration facility (hereinafter referred to as contaminated air) or in deposits (incineration ash, etc.) attached to the incineration facility. Difference Determine the sex and the concentration of each isomer.
[0039]
In this embodiment, the contamination level is measured using contaminated air or an adhering material as a sample. However, both the contaminated air and the adhering material may be collected as samples to measure the contamination level.
[0040]
Also, if this measurement is contaminated air, the measurement at the time of subsequent contamination confirmation is also contaminated air, and if this measurement is at the deposit, the measurement at the subsequent contamination confirmation is also In addition, when this measurement is contaminated air and deposits, the subsequent measurement is also polluted air and deposits.
[0041]
More specifically, dioxins present in the contaminated air or deposits are measured by measuring the polluted air or deposits with a high resolution GC-MS. Difference A sex body is specified, and the concentration of each isomer is measured.
[0042]
And measured by this high resolution GC-MS Each Ioxin Difference Calculate the toxicity equivalent (TEQ) of each isomer by multiplying the concentration of the sexuality by the toxicity coefficient (TEF) determined for each isomer, and total the toxicity equivalents of each isomer The total toxic equivalent amount (TEQ) is obtained, and the degree of contamination of the site where the contaminated air or deposits are collected is determined based on the total toxic equivalent amount (see FIG. 3).
[0043]
The toxicity coefficient is defined as 1 for the toxicity of 2,3,7,8-TCDD (2,3,7,8-tetrachlorodibenzoparadoxine), which is considered to be the most toxic among dioxins. It is a numerical value that indicates relative toxicity.
[0044]
Subsequently, a management level is set based on the degree of contamination.
[0045]
This management level is set according to the level of contamination at the site where contaminated air or deposits are collected.
[0046]
In other words, it shall be based on the standards set in the “Waste Incineration Facility Dismantling Work Manual” (Japan Safety Products Association, Ministry of Health, Labor and Welfare, Labor Standards Bureau Chemical Substances Research Section).
[0047]
Subsequently, the incineration facility is subjected to a stain-proof section (isolation curing) based on the set management level.
[0048]
That is, the stain-proofing section is performed by curing using a beam tent method or the like using a curing member such as a vinyl sheet.
[0049]
Specifically, for example, when the management level is set high, the incineration treatment facility is an isolation curing that is strictly sealed with a vinyl sheet having a stain resistance.
[0050]
At this time, when the incineration processing facility is isolated and sealed, a clean room is set up to enter and exit from the clean room.
[0051]
Thereby, the scattering etc. of the dioxins from an incineration processing facility to the exterior can be prevented.
[0052]
Subsequently, the decontamination work is performed based on the set management level.
[0053]
When performing decontamination work, set (select) a predetermined protective suit to protect the worker from dioxins based on the set management level, and wear the set (selected) protective suit. The decontamination work is performed.
[0054]
For example, if the management level is set high, workers wear sealed chemical protective clothing, chemical protective gloves, chemical protective boots, and protective caps that are highly resistant to staining but very difficult to move, and that pressure is applied. Wearing a demand-type airline mask, decontamination work is performed while receiving clean air from the outside.
[0055]
On the other hand, if the management level is set low, wear open protective clothing, chemical protective gloves, chemical protective boots and protective caps that are very easy to move but have a low degree of stain resistance, and a simple replaceable dust mask. Wear decontamination work.
[0056]
In the decontamination work, the contaminated part of the incineration facility is washed with high pressure water (for example, 300 to 2000 kg / cm ² ) Is done. In this embodiment, the decontamination work is performed by high-pressure water washing. However, contaminants containing dioxins (contaminated water, etc.) are adsorbed and removed by an absorbent material, or contaminants containing dioxins ( Incineration ash, etc.) may be removed by removing with a scoop, broom, vacuum cleaner or the like.
[0057]
In addition, the washing wastewater generated during the decontamination work is recycled after being treated with water. In recycling use, measure the degree of pollution to check the quality of water. If the management standard (for example, drainage standard) is cleared, it is recycled. If not, it is purified.
[0058]
This degree of contamination is measured based on isomers that have a high degree of contribution to the total toxicity equivalent described below.
[0059]
Moreover, this purification process is performed by processing dioxins and heavy metals below the target value with a dedicated wastewater treatment facility.
[0060]
Therefore, the water used for the cleaning can be reused, and the excess cleaning water can be appropriately treated such as waste water treatment.
[0061]
Subsequently, the contamination removal operation is confirmed based on the degree of contamination.
[0062]
In other words, the confirmation of the decontamination work is performed by extracting isomers having a high degree of contribution to the total toxicity equivalent (isomers having a high contribution ratio) from the contamination degree data (isomer distribution characteristics obtained by measuring DXNs). This is done by calculating the toxic equivalent amount of the extracted isomer.
[0063]
Dioxins differ in the type and amount of isomer detected depending on the measurement site.
[0064]
Specifically, dioxin present at a predetermined site measured by high resolution GC-MS Difference Identifies isomers that have a high degree of contribution to the total toxic equivalent (isomers having the toxic equivalent) from the total toxic equivalent determined from the concentration of the sexual entity and the toxicity coefficient determined for each isomer Then, after the decontamination work, the specified isomer is subjected to high-resolution GC-MS again to measure air or deposits at a predetermined site to determine the toxic equivalent of the specified isomer, Check how much dioxins have been removed from a given site.
[0065]
In other words, since measurement by high resolution GC-MS (determination of DXNs) before decontamination work is performed for all isomers of dioxins, it takes a long time to identify various isomers and measure their concentrations. (Approximately 1 month) is required, but the measurement by high resolution GC-MS after the decontamination work is performed only for the specified isomer, and can be easily performed in a short time (approximately 1 week).
[0066]
Therefore, by identifying the isomer that has the highest contribution to the total toxic equivalent at a given site and confirming how much the toxic equivalent of the isomer has been reduced by the decontamination work, It can be relatively determined how much the toxicity equivalent has been reduced. Further, since the present embodiment performs the confirmation after the contamination work with a high resolution GC-MS as in the case of the DXNs measurement, the contamination removal work can be confirmed with high accuracy (in the order of 0.01 pg). Further, for example, compared with a method of performing measurement by high resolution GC-MS for all isomers of dioxins over a long period of time (approximately one month) after decontamination work, this example shows the specified isomerism. Since only the body is targeted, it can be measured in a short time (approximately one week).
[0067]
Also, when it is difficult to extract data having a high degree of contribution to the contamination from the contamination degree data (isomer distribution characteristics) obtained by the high-resolution GC-MS before the decontamination work, for example, high-resolution GC-MS, for example. As a result of the measurement according to the above, a large number of isomers were confirmed at a predetermined site, and the respective toxic equivalents were found to be relatively close to each other. In the case where it is not possible to clearly identify the isomer with a high degree of contribution, the various isomers of dioxins are divided into several categories according to their properties, and the toxic equivalents of the various isomers thus classified are Identify the isomer category (isomer group) that contributes to the total toxic equivalent at the specified site, and determine the toxic equivalent of the specified isomer category (isomer group) by decontamination work. Can be checked the decontamination work by check digit is reduced.
[0068]
That is, extraction of data having a high degree of contribution to pollution is performed by any one of polychlorodibenzopararadixins (PCDDs), polychlorodibenzofurans (PCDFs) and coplanar PCBs (Co-PCBs) constituting dioxins. This is performed by extracting the amount of isomers in the class (see FIG. 4 in which FIG. 3 is divided into polychlorodibenzopararadixins, polychlorodibenzofurans, and coplanar PCBs).
[0069]
Specifically, data (isomers) with a high degree of contribution to the contamination (total toxic equivalent) from contamination degree data (isomer distribution characteristics) determined by high-resolution GC-MS measurement before decontamination work , The pollution degree data is divided into three categories of polychlorodibenzopararadixins, polychlorodibenzofurans and coplanar PCBs that constitute dioxins, and the isomers grouped into these three categories are classified. Among them, the isomer group of the category having a high degree of contribution to the total toxicity equivalent is identified.
[0070]
Then, after the decontamination work, the toxicity air of the isomer group is measured again by high-resolution GC-MS for the specified isomer group by measuring again the contaminated air or the adhering substance at the predetermined site where the decontamination work was performed. It is determined how much the equivalent amount has been reduced by the decontamination work, and thereby the total toxic equivalent amount of the predetermined site is relatively determined.
[0071]
Therefore, even if it is difficult to identify isomers that have a high degree of contribution to the total toxicity equivalent, it is possible to contribute to the total toxicity equivalent by dividing the contamination degree data into the above three categories. It is easy to identify an isomer group having a high degree of activity, and the amount of isomers of the isomer group is determined by high resolution GC-MS, so that the total toxicity equivalent of a predetermined site can be relatively accurately (on the order of 0.01 pg). In)
[0072]
Similarly, if it is difficult to identify isomers that have a high degree of contribution to the total toxic equivalent, Difference It is also possible to extract an isomer having a high degree of contribution to the contamination by classifying the sex isomer according to the difference in the number of chlorine contained in one molecule of the isomer.
[0073]
That is, when data having a high degree of contribution to the pollution (total toxic equivalent) is extracted from the pollution degree data (isomer distribution characteristics), the pollution degree data is converted into dioxin. Difference The classification is based on the difference in the number of chlorine atoms contained in the sex body, and the extracted data that has the highest degree of contribution to the degree of contamination (total toxic equivalent) from the data on the degree of contamination classified by the difference in the number of chlorine atoms. (See FIG. 5 in which FIG. 3 is divided by the number of chlorine atoms).
[0074]
Specifically, the isomers determined by high-resolution GC-MS measurement before decontamination work are classified according to the difference in the number of chlorine atoms of each of the isomers. Specify the isomer amount of the isomer group that contributes to the toxicity equivalent.
[0075]
Then, after the decontamination work, the toxicity air of the isomer group is measured again by high-resolution GC-MS for the specified isomer group by measuring again the contaminated air or the adhering substance at the predetermined site where the decontamination work was performed. The degree to which the equivalent amount has been reduced by the decontamination work is determined, and thereby the total toxic equivalent amount of the predetermined site is relatively determined.
[0076]
Therefore, even if it is difficult to identify isomers that have a high degree of contribution to total toxic equivalents, isomers should be classified into several categories according to the number of chlorine atoms contained in the isomers. By identifying a group of isomers that have a high degree of contribution to the total toxic equivalent, and obtaining the isomer amount of the isomer group by high resolution GC-MS, the total toxic equivalent of a given site is relatively accurate. Can be obtained well (in the order of 0.01 pg).
[0077]
Subsequently, the management level is changed based on the confirmation work of the decontamination work.
[0078]
That is, after the decontamination work, if the degree of contamination (total toxic equivalent amount) at the predetermined site is sufficiently reduced by the above-described confirmation work, the management level is lowered accordingly.
[0079]
On the other hand, when the degree of contamination (total toxic equivalent amount) of the predetermined part is not reduced, the decontamination work is performed again, or the management level before the decontamination work is maintained.
[0080]
Subsequently, the dismantling work is performed based on the changed management level.
[0081]
That is, for example, based on the changed management level, the dismantling method of the incineration facility is changed to a light one (for example, the use of firearms is prohibited due to the melting of steel, and the ones that have been done manually are firearms) Pressure-type air that is connected to the outside by changing the sealed chemical protective suit, which is highly resistant to staining but very difficult to move, to an open-type protective suit that is extremely mobile. The line mask is changed to a simple replaceable dust mask that is not connected to the outside, and the dismantling work is performed.
[0082]
Since the present embodiment is as described above, the degree of contamination (isomer distribution characteristic) obtained from the incineration facility measured by high-resolution GC-MS is used, and after the decontamination work, the total toxicity equivalent specified in advance is obtained. It is possible to easily confirm the degree of contamination after decontamination work at the predetermined site by simply measuring the concentration of the isomer or group of isomers that contributes to the target and determining the toxic equivalent amount by high-resolution GC-MS. The management level can be easily changed based on the confirmed degree of contamination, so that the dismantling work can be performed efficiently based on the changed management level.
[0083]
As described above, this example is a dioxin having a high degree of contribution to the total toxic equivalent in the site where the decontamination work is performed, which is specified in advance after the decontamination work. Difference By measuring sex or isomer groups by high-resolution GC-MS, it is possible to easily confirm in a short time how much dioxins in the site where the decontamination work has been performed is removed. Thus, it is not necessary to perform the dismantling work consistently at the control level set before the decontamination work as in the conventional case, that is, the operator wears excessive protective equipment (protective clothing) excessively. There is no need to dismantle an incinerated incineration facility.
[0084]
In addition, since the management level can be set to a low level after decontamination work, the operator's protective equipment (protective clothing) can be changed to a protective equipment that is easy to move and work, so dismantling work can be performed. The efficiency can be dramatically improved and the construction period can be shortened.
[0085]
Moreover, since the management level can be set to a low level after the decontamination work, the work method of the dismantling work can be made simpler, and therefore the dismantling work can be performed quickly to further shorten the construction period. The incineration facility can be dismantled at a low cost.
[0086]
Furthermore, this change in the management level can be easily performed because it can be performed by measuring only a specific isomer or isomer group obtained from DXNs measurement by high-resolution GC-MS, and in a short time. Because it can be done, the work will not be interrupted for a long time.
[0087]
In addition, a specific isomer or a specific isomer group having a high degree of contribution to the degree of contamination obtained based on data obtained with high precision by measurement with high resolution GC-MS is used for high-resolution GC-MS after decontamination. Since the total toxic equivalent amount is obtained, decontamination can be confirmed with high accuracy (0.01 pg order).
[0088]
Further, following the analysis of specific isomers (specific isomer group), dioxins can be measured by a high-resolution GC-MS measurement method, and the processing classification of the dismantling material can be quickly performed.
[0089]
Moreover, the quality of the circulated treated water that is circulated and used during the decontamination work can be easily and sufficiently managed by the specific isomer (specific isomer group) analysis.
[0090]
In other words, washing wastewater generated during decontamination work is measured by high-resolution GC-MS for isomers or isomer groups that have a high degree of contribution to the total toxicity equivalent of the site where the decontamination work was performed. By doing this, it is possible to easily confirm how much dioxins are contained in the cleaning wastewater, and thereby it is possible to easily determine whether or not the cleaning wastewater is in a state where it can be recycled.
[0091]
In the incineration facility demolition work, dioxins generated in the target facility because the dioxin concentration is measured by the official method (high resolution GC-MS, etc.) in the preliminary survey. Isomeric fraction The fabric characteristics can be grasped. Focusing on the identification of this isomer distribution, visual confirmation of washing and dioxins measurement by the official method are replaced with the measurement of isomers that contribute to the total toxic equivalent, with the same accuracy as the official method (0 (0.01 pg order), and the dioxin concentration can be specified with high accuracy and in a short time. As a result, the management area can be changed without interrupting the process, and the following effects can be obtained.
[0092]
(1) Improvement of work efficiency by minimizing personal protective equipment
(2) Improvement of work efficiency by releasing restrictions on dismantling method
(3) Shortening the work period by improving work efficiency and shortening analysis time
(4) Reduction of closed curing temporary costs
(5) Ensuring accuracy of cleaning confirmation
[0093]
In addition, this method can be put on the analysis flow by the official method following the analysis of specific isomers, so that confirmation by the official method can be carried out promptly if necessary, and further inspection of the waste acceptance criteria for dismantled materials is performed. There is also an effect that can be implemented simultaneously.
[0094]
In many cases, high-pressure water is used for cleaning work in dismantling of incineration facilities. In this case, the cleaning wastewater is purified and recycled at a temporary water treatment facility. At this time, it is necessary to consider the prevention of exposure of dioxins by the use of the circulating treated water, and by applying this method, highly accurate quality control of the circulating treated water can be performed.
[Brief description of the drawings]
FIG. 1 is a system flow related to dismantling work of a conventional incineration processing facility.
FIG. 2 is a system flow relating to a method for dismantling a waste incineration treatment facility according to the present embodiment.
FIG. 3 is a graph showing the degree of contamination determined by high-resolution GC-MS measurement before decontamination work of this example, that is, the total toxicity equivalent (TEQ) by isomer.
FIG. 4 is a graph when FIG. 3 of the present example is divided into three categories of polychlorodibenzopararadixins, polychlorodibenzofurans, and coplanar PCBs that constitute dioxins.
FIG. 5 shows the dioxin in FIG. Difference It is a graph at the time of classifying by the difference in the number of chlorine contained in a sex body heteromolecule.

Claims (7)

A contaminated decommissioning method for dismantling are facilities contaminated dioxins, the contaminated with dioxins by measuring the dioxin isomers in the facility, followed by management based on the dioxin isomers and the measurement Levels are set, decontamination work is performed based on this management level, and then the degree of pollution reduction by the decontamination work is classified according to the number of chlorine atoms present in the dioxin isomers. confirmed by alleviating the degree of dioxin isomers in particular to the identified isomers of the higher isomers of degree contribute to contamination from the group, followed by the management level on the basis of the check result make changes, followed by pollution decommissioning wherein the performing dismantling of the facility on the basis of the modified management level.   2. The contaminated facility dismantling method according to claim 1, wherein the decontamination work is a water cleaning operation. 3. The method for demolishing a contaminated facility according to claim 2, wherein the water used for the cleaning operation is circulating water, and the circulating water has a predetermined amount of dioxin isomers in the isomer group that contributes to the contamination. A polluted facility dismantling method characterized by the following water: The contamination facility dismantling method according to any one of claims 1 to 3 , wherein the setting of the management level and the change of the management level are setting and changing of specifications of protective equipment for protecting workers from dioxins. Contamination facility dismantling method characterized by the above. The contaminated facility dismantling method according to any one of claims 1 to 3 , wherein the setting of the management level and the change of the management level are setting and changing of a work method of the dismantling work. Method. The contaminated facility dismantling method according to any one of claims 1 to 5 , wherein the facility contaminated with the dioxins is a waste incineration treatment facility. The contaminated facility dismantling method according to any one of claims 1 to 6 , wherein the measurement of the dioxin isomers of the facility contaminated with the dioxins is performed by a high resolution gas chromatography mass spectrometer. Contamination facility dismantling method.

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