JP4544849B2 - Hazardous material treatment system and method for judging graduation of hazardous material contamination - Google Patents

Description

  The present invention, for example, a hazardous substance processing system for judging whether or not a hazardous substance remains in a treated product that has been decontaminated by a process such as cleaning of a contaminated article contaminated with a hazardous substance, and judgment of graduation of the hazardous substance contamination Regarding the method.

  PCB (polychlorinated biphenyl) is a highly toxic chlorinated isomer, and its production and import is prohibited. Although this PCB was manufactured in Japan from around 1954, the adverse effects on the living body and the environment became apparent after the Kanemi oil affairs incident. In 1972, instructions for discontinuation of production and collection (duty of storage) were issued by administrative guidance. There is a history that was done.

PCB has 1 to 10 chlorine atoms substituted on the biphenyl skeleton. There are theoretically 209 types of isomers depending on the number and position of substituted chlorine, and about 100 or more types of isomers are currently confirmed in commercially available PCB products. In addition, since the physical and chemical properties among these isomers, in-vivo stability, and environmental moving bodies are diverse, the chemical analysis of PCBs and the mode of environmental pollution are complicated. Further, PCB is one of the persistent organic pollutants, is hardly decomposed in the environment, is fat-soluble and has a high bioconcentration rate. In addition, it is semi-volatile and can be moved via the atmosphere. In addition, it has been reported to remain in the environment such as water and living things.
As a result, since PCB is extremely stable in the body, it is accumulated in the body and causes chronic poisoning (skin disorder, liver disorder, etc.), and carcinogenicity and reproductive / developmental toxicity are recognized.

  Since PCB has been widely used as insulating oil for transformers, capacitors and the like, it is necessary to process the PCB. For this reason, various decomposition methods for detoxifying the PCB have been proposed (see Patent Document 1, Patent Document 2, and Patent Document 3).

  Here, the PCB detoxification apparatus processes only PCB, but the PCB contaminated container from which one PCB is extracted is subjected to a cleaning process with a cleaning liquid such as an organic solvent or a surfactant, and the container is harmless. (Patent Document 4).

Japanese Patent Laid-Open No. 11-253895 Japanese Patent Laid-Open No. 11-253796 JP 2000-126588 A JP 2002-248455 A

  However, there is a problem that it is difficult to determine whether or not cleaning is completed because the cleaning reference concentration for cleaning the PCB contaminated container is extremely small.

For example, in the wiping test method using a solvent (for example, n-hexane), the amount of PCB attached to the member is regulated to be 0.1 μg / 100 cm ² or less (= 10 μg / m ² or less). There is a problem that an error is large in a wiping test for a large area.

  Moreover, although the official method is defined as a method for measuring the PCB concentration, the measurement requires two days or more including pretreatment, and there is a problem that a quick determination cannot be made.

  For this reason, when processing a lot of PCB contaminated containers continuously, a simple and quick determination standard method for cleaning is desired.

  In particular, there are a large number of transformers that used PCB as the insulating oil and were reused after being replaced with other insulating oil after cleaning. These treatments are not performed for sampling but for all cleaning products. Has a problem that it cannot be handled by the wiping test method or the official method.

  In view of the above problems, the present invention provides a hazardous substance processing system capable of quickly treating and determining a contaminant such as a container contaminated with a hazardous substance such as an organic halide such as PCB, and a method for determining the graduation of a hazardous substance contaminant. It is an issue to provide.

The first invention of the present invention for solving the above-described problems is that a decontamination treatment apparatus for decontamination treatment of contaminants to which an insulating oil containing a very small amount of PCB is attached, and the decontamination treatment product include A determination processing unit having a determination unit for determining that it conforms to the residual processing standard for harmful substances, and the determination processing unit determines the insulating oil remaining in the decontaminated product. A determination tank that dissolves in 1-bromopropane, which is a liquid, and an analysis unit that measures the concentration of insulating oil in the determination liquid, and the analysis unit concentrates the determination liquid; after dissolving the concentrate in a solvent, the concentration of the insulating oil was measured, and a insulating oil concentration measuring unit in terms of the concentration determine the residual concentration of PCB in the insulating oil, in the determination unit, it has been obtained in advance calibration Based on the information from the line, the unit surface from the residual concentration (X) of the PCB A hazardous substance processing system is characterized in that a PCB residual amount per product is obtained, a judgment value of a residual standard is obtained from the result, and whether or not the residual standard is met from the judgment value .

According to a second aspect of the present invention, there is provided a hazardous substance processing system according to the first aspect , further comprising a densitometer that monitors the concentration of 1-bromopropane as the determination solution.

A third invention is the hazardous substance processing system according to the first or second invention, wherein the harmful substance decontamination processing apparatus is a vacuum heating processing apparatus or a cleaning processing apparatus.

4th invention is a hazardous substance which determines that the decontaminated product conforms to the residual treatment standard of the hazardous substance after decontaminating the contaminant to which the insulating oil containing a trace amount of PCB is attached. A method for determining the graduation of contaminants, wherein the insulating oil remaining in the decontaminated product after the decontamination process is dissolved in 1-bromopropane as a determination liquid, and a part of the determination liquid is removed. The volume is determined, the determination liquid in the constant volume liquid is concentrated, the concentration of the insulating oil is measured , the residual concentration of PCB is obtained by conversion from the concentration of the insulating oil, and information from the calibration curve obtained in advance is obtained. Based on the PCB residual concentration, a PCB residual amount per unit area is obtained, a residue standard judgment value is obtained from the result, and whether or not the residue standard is met is judged from the judgment value. There is a method for judging the graduation of toxic substances.

According to a fifth aspect of the present invention, in the fourth aspect of the invention, the measurement of the insulating oil concentration is performed after the PCB in the insulating oil is removed.

According to a sixth invention, in the fourth invention, there is a processing graduation judgment method for hazardous substance contaminants, characterized in that a carbonate is added during the concentration.

  According to the present invention, it is possible to quickly determine the treatment of a container or the like contaminated with a harmful substance such as an organic halide such as PCB.

  Hereinafter, the present invention will be described in detail with reference to the drawings. Note that the present invention is not limited to the embodiments. In addition, constituent elements in the following embodiments include those that can be easily assumed by those skilled in the art or those that are substantially the same.

FIG. 1 shows a schematic configuration of a hazardous substance processing system for contaminants contaminated with harmful substances.
As shown in FIG. 1, a hazardous substance processing system 10 includes a hazardous substance decontamination processing apparatus 12 for decontaminating a hazardous substance contaminated product 11 which is a contaminant contaminated with insulating oil containing a hazardous substance, and the decontamination process. And a determination processing unit 20 that determines that the processed product (processed product) 13 conforms to the residual processing standard of harmful substances.

As shown in FIG. 1, the determination processing unit 20 remains in the processed product 13 after processing the hazardous material contaminated product 11 contaminated with the insulating oil containing the hazardous material by the hazardous material decontamination processing device 12. Based on the determination tank 15 for dissolving harmful substances and insulating oil in the determination liquid 14, the analysis unit 16 for measuring the concentration of the insulating oil in the determination liquid 14, and the analysis result 17 in the analysis unit 16, And a determination unit 18 including information processing means for determining whether or not the reference value is met.
The analysis unit 16 includes an evaporation unit or a concentration unit that evaporates or concentrates the determination liquid 14, and a weight measurement unit that measures the weight of the evaporated product or the concentrate.

  Here, examples of the harmful substance decontamination processing apparatus 12 include a known harmful substance decontamination apparatus such as a vacuum heating processing apparatus such as a vacuum heating furnace or a cleaning processing apparatus using a cleaning tank.

Further, the treated product 13 is obtained by treating the toxic substance-contaminated product 11 with the toxic substance decontamination processing device 12. For example, when the toxic substance is PCB, the container, the core, which is a constituent material such as a transformer or a capacitor. -Examples of transformer cut objects, iron cores, copper wires, insulators, and metal fittings.
Here, conventionally, some transformers and capacitors are reused by removing the PCB used as the insulating oil, cleaning it, and then supplying insulating oil other than PCB. This recycled product is washed and used with a reduced PCB concentration, but PCB is not completely removed, and a small amount (for example, several ppm to several hundred ppm) of PCB is dissolved in insulating oil. May have.

Here, FIG. 2 shows a specific outline of a hazardous substance processing system in which a transformer is used as an example of the hazardous substance contaminated product 11.
As shown in FIG. 2, the columnar transformer 200 contaminated with harmful substances is subjected to a disassembly separation process by a disassembly apparatus not shown, and separated into a container 201 and a member 202 such as an iron core. In addition, the container 201 and the member are put in a mesh-like basket 203 so that each can be easily processed.

In FIG. 2, a vacuum heating furnace 204 is used as the harmful substance decontamination processing apparatus 12, and heating is performed at a high temperature of 200 ° C. or higher for several hours to several tens of hours under normal pressure. By this vacuum heating, insulating oil and PCB are decontaminated, and the average amount of PCB in the insulating oil is, for example, 10 ppm on average, and the amount of PCB attached to the member is 0.1 μg / 100 cm ² or less.

  Next, determination is performed by the determination device 205. Here, after the decontamination process, the amount of PCB dissolved in the determination liquid 206 is a very small amount below the detection limit, so that it is difficult to directly measure it. Therefore, the insulating oil that exists about 100,000 times more than the PCB is measured.

Here, the determination liquid 14 used in the determination tank 15 is 1-bromopropane (CHBr, absol {trade name}), butanol (C ₄ H ₉ OH), isopropyl alcohol (C ₃ H ₇ OH), isopropyl alcohol. Any of a mixed solution of water and water can be used. Other determination liquids include, for example, C ₅ H ₃ F ₇ (Zeorolla H {product name}), C ₅ H ₂ F ₁₀ (Bertrel XF {product name}), C ₄ H ₉ OCH ₃ (Novec HFE- 7100 {trade _{name}), C 4 F 6 Cl} 4 ( chlorofluorocarbon, can be used S316 {trade name}) fluorine-based or fluorine-chlorine-based solvents such as. In particular, 1-bromopropane is a solvent that can be used in the firefighting law even in semi-industrial zones, so it is highly safe and does not conform to the regulations of the ozone layer protection law such as alternative chlorofluorocarbons. .

  In order to perform weight measurement in the analysis unit 16, as shown in FIG. 3, the processed product 13 is immersed in the determination tank 15, and after a predetermined time has elapsed, the determination liquid 14 is collected (S-11), The determination solution is concentrated or evaporated (S-12). Next, the concentrate or evaporation residue is measured with a precision gravimetric instrument (S-13). Thereby, the amount of insulating oil can be measured. Then, as shown in FIG. 1, the analysis result 17 is sent to the determination part 18, and determination is performed here.

Further, instead of the weight measurement unit, the concentration of the insulating oil may be measured by the insulating oil concentration measurement unit after dissolving the evaporate or the concentrate with a solvent.
Here, in order to perform concentration measurement, as shown in FIG. 4, the processed product 13 is immersed in the determination tank 15, and after a predetermined time has elapsed, the determination liquid 14 is collected (S-21), Concentrate or evaporate (S-22). Next, the concentrate or evaporation residue is dissolved with a solvent, and the concentration of the insulating oil is measured after constant volume (S-23). Then, as shown in FIG. 1, the analysis result 17 is sent to the determination part 18, and determination is performed here.

Here, for the dissolution of the concentrate or residue, for example, a solvent having good solubility of harmful substances such as n-hexane, acetone, benzene, and toluene may be selected.
Although the specific example of a measurement procedure is shown below, this invention is not limited to this.
First, 100 ml of the determination liquid 14 is collected from the determination tank 15 and concentrated. At this time, when 1-bromopropane is used as the determination liquid to be used, for example, a carbonate such as sodium carbonate or lithium carbonate may be used and evaporated in the presence of these. Thereby, generation of hydrogen bromide (HBr) can be prevented in the evaporation process.
After this concentration, the concentrate is dissolved with n-hexane and made up to a volume of 5 ml. The concentration of this constant volume sample is measured by an analyzer such as a gas chromatograph.

FIG. 5 shows an example of this analyzer. Here, as shown in FIG. 5, in the measurement sample 61, insulating oil (◯), PCB (□) which is a harmful substance, and determination liquid (Δ) are mixed.
Acetonitrile is used as an elution solvent by the flow injection method.
As the elution solvent, dimethyl sulfoxide may be used instead of acetonitrile.
As shown in FIG. 5, a measurement sample 61 obtained by quantifying the concentrate to a predetermined amount is added to an elution solvent 62 of acetonitrile and introduced into an elution coil 63 equipped with ultrasonic generation means. After exiting the elution coil 63, the determination liquid (Δ) 14 is separated by the separation separator 64. Next, water and hexane are separately supplied and introduced again into the elution coil 65 equipped with ultrasonic generation means. After leaving the elution coil 65, the aqueous impurities 67 are separated by the separation separator 66. As this aqueous impurity 67, the stabilizer etc. which exist in the determination liquid 14 are remove | excluded. PCB is dissolved in hexane. Next, the components are separated by the column 68 of the high performance liquid chromatograph, the PCB (□) is fractionated and removed (precut), and then only the insulating oil (◯) is introduced into the gas chromatograph (GC) 69, and the FID. (Hydrogen flame ionization detector) or MS (mass spectrometer).

On the other hand, as shown in FIG. 6, by changing the column and elution conditions of the liquid chromatograph, the insulating oil (◯) was separated, and only PCB (□) was introduced into the gas chromatograph (GC) 69, You may make it analyze by ECD (electron capture type | mold detector) MS (mass spectrometer).
In this case, it is applied when the amount of PCB is not less than the measurement limit.

Next, an example of a determination procedure in the determination processing unit 20 will be described with reference to FIG.
First, the processed product 13 is moved into the empty determination tank 15, and then the determination solution 13 is supplied, and trace harmful substances and insulating oil adhering to the process product 13 are dissolved in the determination solution 14 (S-101). ). After a predetermined time has elapsed, a predetermined amount of the determination liquid is collected, and the analysis unit 16 determines the concentration (Y) of the insulating oil in the determination liquid (S-102). Next, the residual concentration (X) of the harmful substance is calculated in terms of the concentration of the insulating oil (S-103).
Next, the determination unit 18 obtains the residual amount of harmful substances per unit area from the measured value (X) based on the information obtained from the calibration curve obtained in advance (S-104), and wipes the processed product from this result. A test judgment value is obtained (S-105).
From the judgment value, it is judged whether or not the acceptance standard (graduation) of the processed product wiping test has been reached (S-106).
Here, an example of obtaining a calibration curve will be described.
First, members with PCBs attached from low concentration to high concentration are prepared, and each is washed in a determination tank containing different determination liquids.
Next, the PCB concentration in each determination solution is analyzed and measured. (A)
Similarly, the wiping test is also performed on the member, and the PCB adhesion amount per unit area is analyzed and measured. (B)
From the concentrations of (A) and (B) determined here, a relationship diagram between the concentration in the determination solution and the wiping test concentration is created, so-called a calibration curve, and when the actual graduation determination, The remaining amount of PCB per unit area in the wiping test is determined from the concentration.
From the judgment value, it is judged whether or not the passing standard (graduation) of the processed product wiping test is reached.

  Therefore, based on the above acceptance criteria, as shown in FIG. 1, it is selected 19 whether the processed product 14 is a processed product 21 or a reprocessed product 22 to be processed again.

  In the determination shown in FIG. 1, a supply tank 23 for supplying a determination liquid to the determination tank 15 is provided, and after the processed product 13 is stored in the determination tank 15, the supply tank 23 is closed and the supply tank Alternatively, the determination liquid 14 may be supplied from 23 to the determination tank 15, and the processed product 13 may be immersed in the determination liquid 14.

  After the determination process, the determination liquid 14 is drained from the determination tank 15, and the processed product 13 is dried in the drying chamber 24. The drying chamber 24 may be integrated with the determination tank 15 or may be provided separately.

  As a method for immersing the processed product 13 in the determination liquid 14, a so-called soaking method in which the processed product 13 is immersed in a determination tank filled with the determination liquid 14 may be used.

  In addition, when the amount of harmful substances in the determination liquid 14 is higher than the determination standard, the determination process cannot be performed, so the concentration of the harmful substances in the determination liquid 14 is separately analyzed by the analysis unit. Then, the determination is made while confirming that the harmful substance concentration of the determination liquid 14 is not more than a predetermined amount.

For example, as shown in FIG. 8, when PCB is taken as an example of a harmful substance, when the graduation standard is set at 0.5 mg / kg (0.3 ppm) in the amount of PCB in the determination liquid 14, the determination liquid When the amount of PCB in 14 is 0.5 mg / kg or less, it can be used again as a determination solution.
Here, since a predetermined amount of PCB usually dissolves in the determination solution, the concentration gradually increases. Therefore, when a determination liquid management concentration transition curve is created from the processing results and the determination liquid management concentration is set to a high value of 0.3 mg / kg (0.3 ppm), the determination liquid that has shifted along the reference curve has a high concentration. When the concentration is reached, the determination solution is replaced. On the other hand, when the transition curve is abnormal and becomes a sharp curve (abnormality detection by a broken line in the figure), the decontamination processing device 12 and the determination tank 15 are inspected.

  Further, a concentration adjusting unit 25 that adjusts the concentration of the determination liquid 14 is provided, and the determination is made when the harmful substance concentration is equal to or higher than a predetermined amount from the analysis result 17 of the analysis unit 16 that measures the concentration in the determination liquid 14. The concentration of the liquid is adjusted.

  As shown in FIG. 1, the concentration adjusting means 25 includes a supply tank 23 for supplying the determination liquid 14, a concentration meter 26 for monitoring the concentration in the determination liquid 14, and a waste liquid tank 27 for storing the determination waste liquid. The determination liquid 14 determined in the determination tank 15 is adjusted.

  Examples of the concentration meter 26 include a density meter that measures the specific gravity of the determination liquid 14 or a density meter that measures the density of the determination liquid.

  While performing this simple determination method at all times, for example, in the case of a processed container such as a transformer, the container wiping test by an official method is performed for each predetermined lot, whereby all container processing can be managed.

  Accordingly, by confirming that the PCB concentration in the determination tank 15 is, for example, 0.5 mg / kg (0.5 ppm) or less, the graduation standard is met.

Next, details of the determination processing unit 20 will be described with reference to FIG.
As shown in FIG. 9, the determination processing unit 20 includes an inlet chamber 40 that receives the processed product 13, a determination tank 15 that immerses the processed product 13 in the determination liquid 14, and a liquid that removes the determination liquid 14 from the processed product 13. The cutting chamber 41, the drying chamber 24, and the outlet chamber 43 for carrying out the dried decontamination product 42 are exhausted from the determination tank 14, the liquid cutting chamber 41, and the drying chamber 23. The determination liquid 14 collected and separated by the device 46 is returned to the determination liquid recovery tank 47 and reused. The exhaust gas is discharged to the outside after passing through the filter 48, and a part of the exhaust gas is circulated from the hot air generator 49 to the drying chamber 23.

In the above-described configuration, the processed product 13 is immersed in the determination tank 15 at the time of determination, the harmful substances and insulating oil remaining in the determination liquid 14 are dissolved, the concentration of the insulating oil is measured by the analysis unit 16, and the result is obtained. The determination unit 18 makes the determination.
Further, the determination liquid 14 that has passed through the analysis unit 16 measures the concentration of the determination liquid by the densitometer 26 to determine whether or not the concentration is within the standard.
The determination liquid 14 collected in the determination liquid recovery tank 47 is distilled by the distillation purifier 50 and supplied to the determination liquid supply tank 22. The insulating oil separated by the distillation purifier 50 is stored in the insulating oil tank 51.

  As described above, according to the hazardous substance contamination processing system according to the present invention, the processed product 13 after processing the hazardous material contaminated product 11 is immersed in the determination tank 15, and the harmful substances remaining in the determination liquid 14 and When the insulating oil is dissolved and the concentration of the insulating oil is measured by the analyzing unit 16, the residual amount of the harmful substance can be indirectly measured when the amount of the harmful substance is extremely small.

  In addition, a determination unit 18 that determines the concentration of harmful substances in the determination liquid 14 from the analysis result 17 of the analysis unit 16 is provided, and the determination unit 18 determines from the measured value of the insulating oil in the determination liquid 14 in the determination tank 15. The determination value of the treated product wiping test is obtained by determining the residual amount of harmful substances per unit area and selecting (determining) 19 whether or not the acceptance criteria of the treated product wiping test are reached.

  As a result, when the processing is properly performed and a certain criterion is reached (graduation), as shown in FIG. 1, a so-called hazardous substance-free finished product 21 is obtained. On the other hand, when the processing is not properly performed and the predetermined criterion is not reached (failure), the product is reprocessed product 22. Processing is performed again.

FIG. 10 shows an outline of the PCB decomposition processing system.
As shown in FIG. 10, the PCB detoxification treatment system is a hazardous substance treatment system for detoxifying a workpiece to which PCB, which is a hazardous substance, is attached, contained or stored, and is a hazardous substance 1001. One or both of separation means 1004 for separating the harmful substance 1002 from the container 1003 for storing the substance (for example, PCB) 1002, and disassembly means 1005 for disassembling the constituent materials 1001a, b,. The pre-processing means 1006 having the core, and the constituent material 1001a such as the core, which is the constituent material of the processing object processed in the pre-processing means 1006, are separated into the organic material 1007 such as paper and wood and the inorganic material 1008 such as the coil and iron core. Separating means 1009, separated inorganic material 1008 such as coil and iron core, and metal container separated by dismantling device 1005 ( Cleaning unit 1011 for cleaning 1003 with a cleaning liquid 1010, a fine pulverizer 1015 for slurrying organic matter such as paper and wood separated by the separating unit 1008, a cleaning waste liquid 1012 after cleaning, The hazardous substance decomposition treatment means 1013 for decomposing any one or a plurality of the harmful substances 1002 and the slurry 1014 separated by the pretreatment means, and the residual amount of harmful substances attached to the container 1002 washed by the washing means 1011 are quickly determined. And a hazardous substance contamination determination processing unit 20 to be determined.

  Here, examples of harmful substances to be detoxified in the present invention include, in addition to PCB, for example, vinyl chloride sheets, hazardous waste paints, waste fuels, hazardous chemicals, waste resins, untreated explosives, etc. It is not limited to these as long as it is a harmful substance resulting from contamination.

  Examples of the object to be treated in the present invention include, for example, a transformer or a capacitor using PCB as an insulating oil, a storage container storing a paint that is a harmful substance, etc., but is not limited thereto. It is not a thing.

Next, the configuration of the hazardous substance processing means 1013 is shown in FIG.
As shown in FIG. 11, a hydrothermal oxidative decomposition apparatus 120, which is an example of a hazardous substance treatment means, includes a cylindrical primary reaction tower 122, oil (or organic solvent), PCB, water (H ₂ O), and hydroxylation. A pressurizing pump 124 that pressurizes each of the processing solutions 123a to 123d of sodium (NaOH), a preheater 125 that preheats the water, a secondary reaction tower 126 having a configuration in which, for example, a pipe is spirally wound, and a cooler 127 And a pressure reducing valve 128. Further, a gas-liquid separator 129 and an activated carbon layer 130 are disposed downstream of the pressure reducing valve 127, exhaust gas (CO ₂ ) 131 is exhausted from the chimney 132, and drainage (H ₂ O, NaCl) 133 is It is stored in the discharge tank 134 and is drained separately if necessary.

It should be noted that oil (or organic solvent), PCB, H ₂ O, and NaOH treatment liquids 123a to 123d that become the treatment liquid 123 are fed from the treatment liquid tanks 135a to 135d through pipes 136a to 136d and a mixer 137 such as an ejector. Each is introduced. Further, an oxidant such as oxygen (O ₂ ) is supplied by the high-pressure oxygen supply facility 138, and the supply pipe 139 is directly connected to the primary reactor 122. The reason why oil (or organic solvent) is added is to promote the decomposition reaction of particularly high-concentration PCB and to raise the reaction temperature to the optimum temperature when the hydrothermal oxidative decomposition apparatus 120 is started. Further, the above PCB, H ₂ O and NaOH may be mixed as the treatment liquid and charged into the primary reaction tower 122.

In the above apparatus, the pressure in the primary reaction tower 122 is increased to 26 MPa by pressurization by the pressure pump 124. The preheater 125 preheats H ₂ O to about 300 ° C. Further, oxygen is spouted into the primary reaction tower 122, and the temperature is raised to 380 ° C. to 400 ° C. by the internal reaction heat. By this stage, for example, PCB has undergone dechlorination reaction and oxidative decomposition reaction, and has been decomposed into NaCl, CO ₂ and H ₂ O. Next, in the cooler 127, the fluid from the secondary reaction tower 126 is cooled to about 100 ° C. and the pressure is reduced to atmospheric pressure by the pressure reducing valve 128 at the subsequent stage. Then, CO ₂ and water vapor and the treatment liquid are separated by the gas-liquid separator 129, and the CO ₂ and water vapor are discharged into the environment through the activated carbon layer 130.

By treating PCB-containing oil (for example, insulating oil for transformers, capacitors, etc.) using such a processing apparatus 120, PCB is dechlorinated and dechlorinated products such as biphenyl ((C ₆ H ₅ ) ₂ ). The biphenyl is completely detoxified into CO ₂ , H ₂ O and the like by the action of an oxidizing agent or the like.

  In the above system, since the cleaning effect in the cleaning means 1011 can be quickly determined in the determination processing unit 20, an efficient container cleaning process is possible, and the waiting time for determining the container cleaning process can be shortened. It is not necessary to secure space.

  In addition, since the time required for analysis can be reduced and the operability can be simplified, it is possible to make a determination with no individual difference in the container cleaning determination.

  In addition, it is possible to determine the container processing for several hundred units / day, and the environmental load of the cleaning waste liquid temporarily stored for waiting for the determination can be reduced.

  In this embodiment, the cleaning apparatus 1011 is used as the decontamination means, but decontamination may be performed using a vacuum heating apparatus as shown in FIG. Moreover, you may make it use a vacuum heating apparatus and a washing | cleaning apparatus together.

  As described above, according to the hazardous substance processing system according to the present invention, it is possible to safely and accurately handle hazardous substances, and always determine whether the processed product is continuously below the standard. It can be determined whether the decontamination process is reliably performed, and can be applied to a decontamination process of a container or a member contaminated with a trace amount of harmful substances such as PCB, for example.

It is a block diagram of a hazardous substance processing system. It is the schematic of the hazardous | toxic substance processing system which made the transformer an example. It is a flowchart of determination. It is a flowchart of determination. It is a block diagram of an analysis part. It is another block diagram of an analysis part. It is a flowchart of graduation determination. It is a control chart of judgment liquid management. It is the schematic of a determination process part. It is the schematic of a PCB decomposition processing system. It is the schematic of a hydrothermal oxidative decomposition processing apparatus.

Explanation of symbols

10 Hazardous Substance Treatment System 11 Hazardous Substance Contaminated Products 12 Hazardous Substance Decontamination Treatment Equipment 13 Decontamination Treated Product (Processed Product)
14 determination liquid 15 determination tank 16 analysis unit 17 analysis result 18 determination unit 20 determination processing unit

Claims (6)

Toxic substance decontamination equipment that decontaminates contaminants with insulating oil containing a very small amount of PCB,
A determination processing unit having a determination unit for determining that the decontamination-treated product conforms to a hazardous substance residual treatment standard;
Comprising
A determination tank in which the determination processing unit dissolves the insulating oil remaining in the decontamination processed product in 1-bromopropane as a determination liquid;
Including an analysis unit that measures the concentration of insulating oil in the determination liquid,
and,
A concentration unit for concentrating the determination solution;
An insulating oil concentration measuring unit for measuring the concentration of insulating oil after dissolving the concentrate with a solvent, and calculating the residual concentration of PCB by converting from the concentration of insulating oil,
Based on the information obtained from the calibration curve obtained in advance, the determination unit determines the PCB residual amount per unit area from the residual PCB concentration (X), and determines the residual reference determination value from this result. A hazardous substance processing system for judging whether or not a residue standard is met from a value . Oite to claim 1,
A hazardous substance processing system comprising a densitometer that monitors the concentration of 1-bromopropane as the determination liquid. In claim 1 or 2 ,
A hazardous substance treatment system, wherein the hazardous substance decontamination treatment apparatus is a vacuum heat treatment apparatus or a cleaning treatment apparatus. Judgment of graduation of hazardous substance pollutant to determine that the decontaminated product conforms to the standard for residual treatment of hazardous substances after decontaminating the contaminated substance with insulating oil containing a very small amount of PCB A method,
Insulating oil remaining in the decontaminated product after the decontamination process is dissolved in 1-bromopropane as a determination liquid,
Part of the determination liquid is made constant volume, the determination liquid in the constant volume liquid is concentrated, the concentration of the insulating oil is measured, and the residual concentration of PCB is calculated in terms of the concentration of the insulating oil ,
Based on the information obtained from the calibration curve obtained in advance, the PCB residual amount per unit area is obtained from the residual concentration of the PCB, the judgment value of the residual standard is obtained from the result, and the residual standard is adapted from the judgment value. A method for judging graduation of processing of pollutants of harmful substances, characterized by judging whether or not . In claim 4 ,
The method for determining graduation of harmful substances contaminated by processing, wherein the measurement of the insulating oil concentration is carried out after removing PCB in the insulating oil. In claim 4 ,
A method for judging the graduation of a hazardous substance contaminant, wherein a carbonate is added during the concentration.

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