JP4687075B2 - Detoxification treatment method for PCB-containing oil and detoxification treatment apparatus for PCB-containing oil - Google Patents

Description

The present invention relates to a detoxification treatment method for oil containing the well-known chemical substance PCB (polychlorinated biphenyls = polychlorinated biphenyl), and a detoxification treatment device for PCB-containing oil for carrying out the detoxification treatment method. The present invention relates to a method for detoxifying PCB-containing oil using a PCB-containing oil spraying technique and a silent discharge (dielectric barrier discharge) technique in combination, and an apparatus for detoxifying PCB-containing oil by the method.

  PCB is a generic name for isomeric substances having a biphenyl skeleton structure in which two benzene rings are connected, and any of 10 hydrogen atoms arranged around the skeleton is substituted with chlorine (Cl). Because of its high boiling point, it is difficult to thermally decompose, is chemically stable, and has high insulation and high lipophilicity, it has been used as an electrical insulation oil for electrical equipment such as transformers and capacitors in Japan. There were times when it was used in a wide range of applications, as an additive for copying paper, or as a heat medium or lubricating oil. However, because the harmful effects of PCBs on the human body became clear, the production of PCBs was completely discontinued in 1972, and there was a history of high-temperature incineration of the remaining PCB-containing oil. The remaining PCB-containing oil has been continuously stored in a sealed state. However, due to concerns over leakage of PCB-containing oil that has been continuously stored due to the aging of storage facilities over time, the “Special Measures Law on Promotion of Proper Treatment of Polychlorinated Biphenyl Waste” was enforced in 2001. Since then, the PCB detoxification process has become obligatory within 15 years, and it has become an urgent need to deal with the detoxification process for PCB-containing oil currently stored.

Various PCB detoxification methods have been proposed in the past, and these methods can be broadly classified into the following five types.
That is,
[A] Thermal decomposition method by high-temperature incineration The PCB is decomposed into carbon dioxide, water, inorganic salts and incineration ash by spraying PCB in a high-temperature furnace at 1200 to 1400 ° C. As shown in Japanese Patent Application Publication No. 2004-132558 (Patent Document 1), a PCB solution in which PCB is dissolved in a solvent and water are mixed to produce an emulsion, which is electrolyzed with water using a hydrogen / oxygen gas generating means. A type in which PCB is burned at 1400 ° C. or higher by a hydrogen gas burner by supplying the generated hydrogen gas and oxygen gas in a separated state and spraying the emulsion into a combustion chamber in which the hydrogen gas is burned with oxygen gas. Proposed.
[B] Chemical dechlorination and decomposition method Alkaline agents and carbon-based catalysts are mixed with PCB and heated to 300 to 350 ° C in a nitrogen atmosphere under normal pressure to cause chemical reaction, thereby replacing chlorine in PCB with hydrogen. Thus, a substance other than PCB is converted into a harmless biphenyl compound, inorganic salt and water after the treatment. For example, as disclosed in Japanese Patent Application Laid-Open No. 2003-135621 (Patent Document 2), gelation is achieved by mixing and stirring PCB and chlorine compound with silicone and toluene, and mixing and stirring an alkali agent catalyst. It has been proposed to initiate an exothermic reaction at 40 to 120 ° C. to dechlorinate PCB.
[C] Hydrothermal oxidative decomposition method In the hydrothermal oxidative decomposition method, so-called supercritical water (usually supercritical water at 650 ° C. or higher and 250 atmospheric pressure or higher) in a state exceeding 374 ° C. and 218 atm. 380 ° C using supercritical water oxidation method that decomposes PCB into carbon dioxide gas, water and hydrochloric acid by using strong oxidizing power, and hot water in which oxygen and sodium carbonate are added to water just before supercritical There is a hydrothermal decomposition method in which PCB is oxidatively decomposed at 270 atm. For example, as disclosed in Japanese Patent Application Laid-Open No. 2003-175327 (Patent Document 3), a pre-reactor and a post-reactor for decomposing a halogenated organic compound in a supplied processing solution under a high temperature and high pressure environment are provided. A hydrothermal oxidative decomposition apparatus is also proposed which supplies the processing liquid in the former stage reactor to the inside of the latter stage reactor.
[D] Photolysis method A PCB is dechlorinated by irradiating the PCB with ultraviolet rays having a wavelength of 250 to 300 nm, and a small amount of residual PCB is decomposed by a noble metal catalyst or a microorganism. As shown in the publication (Patent Document 4), an excimer light emitting part having an internal electrode, a metal container that is disposed outside the excimer light emitting part and fills a liquid containing an organic compound, and between the internal electrode and the metal container Excimer light that generates an organic compound-containing liquid filled between the excimer light emitting part and the metal container from the excimer light emitting part using an organic substance decomposing apparatus equipped with a power source for applying a voltage to the dielectric barrier discharge. Have been proposed to decompose into carbon dioxide or water.
[E] Reductive thermochemical decomposition method As a reductive thermochemical decomposition method, PCB is finally converted into hydrochloric acid and methane by a reduction reaction in which PCB is heated under normal pressure in a pure hydrogen atmosphere and dechlorinated and decomposed without using a catalyst. , decomposed into carbon monoxide, carbon dioxide, hydrogen and minor lower hydrocarbons, hydrochloric acid and vapor phase hydrogen reduction method for detoxifying and discharged out of the system to neutralize, blowing PCB waste iron melting bath The PCB is decomposed once to the atomic level , and then the chemical composition of the product is controlled by adjusting the pressure, temperature, and oxygen supply amount, and thermal energy from oxygen plasma or air plasma is used. Decomposing PCBs in an oxidizing atmosphere and detoxifying them (using DC plasma jet to react PCB-containing oil and oxygen to decompose and detoxify PCBs) In addition, a plasma melting method is known in which incineration ash or incineration fly ash left by high temperature incineration is melted and solidified using thermal energy generated by plasma to make slag harmless. For example, as disclosed in Japanese Patent Application Laid-Open No. 2003-19434 (Patent Document 5), soil contaminated with PCB is spirally moved by a cyclone and supplied to a plasma processing vessel, and the cyclone or plasma treatment is performed. There has been proposed a method for detoxifying a PCB by chemically reacting with an activated plasma of a processing gas introduced from a gas inlet of a container.
Japanese Patent Laid-Open No. 2004-132558 Japanese Patent Laid-Open No. 2003-135621 Japanese Patent Laid-Open No. 2003-175327 Japanese Patent Laid-Open No. 11-319816 Japanese Patent Laid-Open No. 2003-19434

  However, any of the conventional PCB detoxification processing methods as described above has a great difficulty in practical use. That is, in the pyrolysis method by high temperature incineration, it is difficult to manage the processing furnace for incineration at high temperature, and there are problems that undecomposed PCB remains in the incineration ash, and dioxins that are more toxic than PCB at low processing temperature. In the chemical dechlorination decomposition method, a strong alkali agent is required for effective dechlorination, and the strong alkali agent is generally difficult to handle. NaOH, KOH, Na , K in this order is difficult. In addition, chemical dechlorination decomposition method, hydrothermal oxidative decomposition method, photodecomposition method and reductive thermal chemical decomposition method all require large-scale equipment, which may increase plant construction costs and equipment operation costs. This is a major difficulty in practical use, and is also regarded as a problem in terms of processing costs when a large amount of oil containing PCB is harmlessly processed.

In view of the above-mentioned practical difficulties of various conventional PCB detoxification treatment methods, the present invention is simple in PCB detoxification treatment process and its treatment apparatus, and the construction cost and operation cost of the treatment equipment are bulky. In addition, the use of strong alkali agents and special catalysts and chemicals that are difficult to handle is not required, the high-temperature treatment required for the plasma melting method is not required, the detoxification treatment can be performed at normal temperature and pressure, and the environmental impact is small. In particular , a highly practical PCB-containing oil detoxification method and a PCB-containing oil detoxification processing apparatus for carrying out the detoxification treatment method, which are particularly excellent in terms of safety and cost, which are particularly important in practical use, It is something that is going to be realized.

In order to achieve the above-mentioned problems and objects, the present invention uses a silent discharge system having a new configuration, atomizes PCB-containing oil, and uses the atomized PCB-containing oil as a silent discharge system during silent discharge operation. The PCB in the oil containing PCB is converted into a harmless substance by circulating it in the silent discharge space.

Further, the PCB-containing oil is supplied to the spray nozzle with an inert gas and the inert gas is separately supplied to the spray nozzle, whereby the PCB-containing oil is atomized and ejected from the spray nozzle , and the atomized jet is ejected. The PCB-containing oil is circulated in a silent discharge space formed between a plurality of dielectric silent discharge barriers each having a discharge electrode plate mounted on one side, thereby converting the PCB into a harmless substance.

Further, the PCB-containing oil in which the PCB remains even after being detoxified through circulation in the silent discharge space is recovered, the recovered PCB-containing oil is atomized again, and the atomized PCB-containing oil is recovered. The PCB remaining in the PCB-containing oil is converted into a harmless substance by flowing in the silent discharge space during the silent discharge operation.

On the other hand, as a detoxification processing device for PCB-containing oil, a means for atomizing PCB-containing oil, a silent discharge system through which the atomized PCB-containing oil circulates, and a high supply of silent discharge energy to the silent discharge system A detoxification processing apparatus having a voltage power source as a main part is configured.

In addition, spray nozzles for atomizing PCB-containing oil supplied with PCB-containing oil and inert gas, and a plurality of dielectric silent discharge barriers each having a discharge electrode plate mounted on one side thereof are arranged in parallel at intervals. And a reactor having a silent discharge system in which a silent discharge space is formed between the dielectric silent discharge barriers facing each other, and the atomized PCB-containing oil flows in the silent discharge space, and the silent discharge system A PCB-containing oil detoxification processing apparatus having a high-voltage power supply for supplying energy as a main part is configured.

  Furthermore, as a silent discharge system that can be accommodated in the reactor, a plurality of dielectric silent discharge barriers each having a discharge electrode plate mounted on one side thereof are arranged in parallel with a space therebetween, and the silent discharge barriers facing each other are arranged. A silent discharge space is formed between them, and two electrode groups are formed by alternately selecting discharge electrode plates in parallel with the silent discharge barrier, one of which is the ground electrode, and the other electrode The group shall be connected to the power output terminal.

  According to the PCB-containing oil detoxification treatment method and the detoxification treatment apparatus according to the present invention, a silent discharge comprising a spray nozzle for atomizing, dropletizing, or vaporizing PCB-containing oil, and a dielectric barrier is provided. The detoxification process is performed by combining the systems, the process of the detoxification process is very simple, the construction cost and the use cost of the detoxification treatment apparatus can be kept low, the environmental cost is small, safe and It is a detoxification treatment technology that can be implemented effectively. Further, the reaction in the detoxification treatment according to the present invention does not require a high-temperature treatment as seen in the plasma melting method described above, and is extremely easy to handle at room temperature and normal pressure, and does not require a special catalyst or chemical. There is no generation of residue. Further, the treated oil can be used as a fuel. Further, since the detoxification process according to the present invention is a gas-liquid mixing process, there is an effect that the fly ash generated during high-temperature incineration as in the prior art and the landfill problem of solidified incineration ash do not occur. Therefore, it is a practical effect as a method for quickly discarding the remaining PCB within a limited time while considering the environment.

  An extremely excellent embodiment of the PCB-containing oil detoxification method according to the present invention is the above-described method, wherein the PCB-containing oil is supplied to the spray nozzle with nitrogen gas and simultaneously the nitrogen gas is supplied to the spray nozzle separately. The PCB-containing oil is atomized, dropletized or vaporized and ejected from the spray nozzle, and the ejected PCB-containing oil is spaced by a plurality of dielectric silent discharge barriers each having a discharge electrode plate mounted thereon. A high voltage is applied between two electrode groups in which a silent discharge space is formed between the silent discharge barriers facing each other and the discharge electrode plates of the silent discharge barriers are alternately selected. The PCB in the PCB-containing oil is converted into a harmless substance by circulating in the silent discharge space of the silent discharge system where the silent discharge is generated, and further, the silent The treated oil that has been detoxified through circulation in the electric space is recovered and atomized, dropletized, or vaporized again, and the atomized, dropletized, or vaporized PCB-containing oil is again silenced. It is a detoxification treatment method for PCB-containing oil, which circulates in a silent discharge space during discharge operation and converts PCB still remaining in the treated oil into harmless substances.

  An extremely excellent embodiment of the PCB-containing oil detoxification processing apparatus according to the present invention includes a pressure vessel that stores a PCB-containing oil that requires detoxification processing, and supplies the PCB-containing oil to atomize, dropletize, or steam. A nitrogen gas cylinder filled with nitrogen gas for atomization, a spray nozzle for atomizing, dropletizing, or vaporizing the PCB-containing oil, and an atomized, dropletized, or vaporized PCB-containing oil Reactor incorporating a silent discharge system that circulates, a power source that supplies silent discharge energy to the silent discharge system, a recovery container that recovers treated oil detoxified in the reactor, and a process recovered in the recovery container Means for returning the finished oil to a pressure vessel for storing the PCB-containing oil, and the silent discharge system includes a plurality of dielectric silent discharge barriers each having a discharge electrode plate mounted on one side as spacers. A silent discharge space is formed in which the atomized, dropletized, or vaporized PCB-containing oil flows between the silent discharge barriers that are arranged side by side with a space therebetween and discharge of each silent discharge barrier. The electrode plates are alternately selected and formed into two electrode groups, one electrode group of which is a ground electrode and the other electrode group is an electrode connected to the output terminal of the power source, the pressure vessel and the The nitrogen gas cylinder is communicated with a pipe via a liquid-side pressure reducing valve, the PCB-containing oil in the pressure vessel and the spray nozzle of the reactor are communicated with a pipe via a liquid flow rate adjusting valve, and further, This is a PCB-containing oil detoxifying device in which a nitrogen gas cylinder and the spray nozzle are communicated with each other via a gas-side pressure reducing valve.

  Embodiments of a PCB-containing oil detoxification treatment method and a PCB-containing oil detoxification treatment apparatus according to the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram of a PCB-containing oil detoxification treatment apparatus according to the present invention, FIG. 2 is a perspective view of a silent discharge system of the detoxification treatment apparatus, and FIG. 3 is a cross-sectional view taken along line SS ′ in FIG. It is sectional drawing of a silent discharge system. FIG. 4 is a graph showing a change in the residual concentration of PCB with respect to the number of discharge treatments, which is the result of the detoxification treatment method for PCB-containing oil according to the present invention.

  As shown in FIG. 1, the PCB-containing oil detoxification treatment apparatus shown as one embodiment of the present invention includes a detoxification treatment reaction part A1 which is the heart of the apparatus, and a PCB-containing oil in the detoxification treatment reaction part A1. PCB-containing oil supply part A2 for supplying detoxification, high voltage power supply part A3 for supplying silent discharge energy to the detoxification treatment reaction part A1, and processed oil for recovering the detoxified oil in the detoxification treatment reaction part A1 It is comprised with collection | recovery part A4.

The detoxification treatment reaction part A1 is composed of a container-like reactor 1, in which a spray nozzle 2 that atomizes the supplied PCB-containing oil and jets it into the reactor 1, and a silent discharge (dielectric barrier discharge). A silent discharge system 3 to be generated is arranged. Reference numeral 4 denotes a lower funnel that receives the treated oil detoxified in the reactor 1, and 5 denotes a lead-out pipe that guides the treated oil received by the lower funnel 4 to the treated oil recovery section A4. As shown in FIGS. 2 and 3, the silent discharge system 3 has a thickness of 0 . Eight glass plates (for example, trade name: TEMPAX) 32 of length 200 mm × width 100 mm × thickness 3 mm on which a 1 mm thin plate-like stainless steel discharge electrode plate 31 is attached are spacers 34. In this way, the silent discharge space 33 having a gap length of 2 mm is maintained and arranged in a parallel state. The glass plate 32 serves as a dielectric silent discharge barrier of the silent discharge system 3, and forms a silent discharge space 33 with a gap length of 2 mm between the dielectric silent discharge barriers (glass plates) 32 , 32 facing each other. Further, along the long sides facing each dielectric silent discharge barrier (each glass plate) 32, a glass epoxy spacer 34 having a thickness of 2 mm is placed on the dielectric silent discharge barrier ( glass plate) 32 facing each other. , 32 is interposed between the two layers to form a silent discharge space 33 of seven layers . Further, two electrode groups 31a and 31b are formed by alternately selecting a glass plate, that is, a group of discharge electrode plates 31 arranged in parallel with a dielectric silent discharge barrier 32, and one of the electrode groups 31a. A discharge electrode plate 31 belonging to 1 is a ground electrode plate, and a discharge electrode plate 31 belonging to the other electrode group 31b is connected to a high voltage output terminal 16a of a high voltage power supply (high voltage power transformer) 16; To do. Then, between the discharge electrode plate 31 belonging to the electrode group 31a and the discharge electrode plate 31 belonging to the other electrode group 31b, a high voltage of commercial frequency AC 10 kV is supplied from the high voltage power transformer 16 of the high voltage power supply unit A3. By being applied, silent discharge (dielectric barrier discharge) is generated and maintained in the silent discharge space 33 of the silent discharge system 3 at room temperature and normal pressure.

  The PCB-containing oil supply unit A2 includes a stainless steel pressure vessel 7 that stores PCB-containing oil 6 that requires detoxification, and a nitrogen gas cylinder 8 that contains nitrogen gas that is an inexpensive inert gas. The nitrogen gas cylinder 8 and the spray nozzle 2 of the reactor 1 communicate with each other through a pipe 10 via a gas side pressure reducing valve 9, and the nitrogen gas cylinder 8 and the pressure vessel 7 are connected via a liquid side pressure reducing valve 11. The pipe 12 communicates with the PCB-containing oil 6 in the pressure vessel 7 and the spray nozzle 2 of the reactor 1 through the pressure regulation valve 13 and the liquid flow rate regulation valve 14 through the pipe 15. is there. The pipes 10, 12, and 15 are chemically stable Teflon pipes. The high-pressure nitrogen gas stored in the nitrogen gas cylinder 8 is supplied by pumping the PCB-containing oil 6 in the pressure vessel 7 to the spray nozzle 2 of the reactor 1 and atomizing, dropletizing, or vaporizing with the spray nozzle 2. It functions to spray toward the silent discharge system 3 inside. That is, the nitrogen gas supplied from the nitrogen gas cylinder 8 is sent to the spray nozzle 2 attached to the upper part of the reactor 1 through the gas side pressure reducing valve 9 and the pipe 10 and simultaneously through the liquid side pressure reducing valve 11 to the PCB. It is also sent to the pressure vessel 7 filled with the containing oil 6. Then, the PCB-containing oil 6 pressurized with nitrogen gas in the pressure vessel 7 is sent to the spray nozzle 2 through the liquid flow rate adjusting valve 14 and the pipe 15. The pressure and flow ratio of the gas (nitrogen gas) flowing through the pipe 10 and the liquid (PCB-containing oil 6) flowing through the pipe 15 are the gas side pressure reducing valve 9, the liquid side pressure reducing valve 11, the pressure adjusting valve 13, and the liquid flow rate adjusting valve. The PCB-containing oil 6 is sprayed toward the silent discharge space 33 of the silent discharge system 3 installed in the reactor 1 after being mixed with nitrogen gas by the spray nozzle 2. . Then, the PCB-containing oil 6 sprayed from the spray nozzle 2 flows into the silent discharge space 33 of the silent discharge system 3 where the silent discharge continues as shown by the arrow M in FIG. In the process of passing through the space 33, chlorine of the PCB component in the oil is removed and detoxified.

  The high-voltage power supply unit A3 includes a high-voltage power supply transformer 16, and the high-voltage side output terminal 16a of the high-voltage power supply transformer 16 has an electrode group 31b disposed on the glass plate (silent discharge barrier) 32 of the silent discharge system 3. Is connected to the discharge electrode 31 belonging to. A high voltage of commercial frequency AC of 10 kV is applied between the discharge electrode plate 31 belonging to the electrode group 31a and the discharge electrode plate 31 belonging to the other electrode group 31b. Reference numeral 17 denotes a voltmeter attached to the high voltage power transformer 16, and 18 denotes an ammeter attached to the high voltage power transformer 16.

  The treated oil recovery section A4 is formed by serially connecting a collection container 20, a mist trap 21, a hexane trap 22, and an activated carbon trap 23. The treated oil that has been detoxified in the reactor 1 is received by the lower funnel 4. Then, it is condensed and liquefied and guided to the collection container 20 for accumulation. Further, the nitrogen gas containing the oil mist discharged from the collection container 20 is released into the atmosphere after the oil mist is removed and purified through the mist trap 21, the hexane trap 22, and the activated carbon trap 23. Further, the treated oil recovered in the recovery container 20 is returned to the pressure container 7 of the PCB-containing oil supply unit A2, and the detoxification process cycle described above is repeatedly executed. Can be increased.

  In addition to the above examples, the PCB-containing oil could be rendered harmless without any problems even if various conditions such as the size of the glass and electrodes constituting the reactor and the silent discharge system, the supply gas flow rate, and the gas pressure were changed. . Further, in the above embodiment, nitrogen gas is used to supply the PCB-containing oil 6 to the reactor 1 and spray it into the reactor 1, but argon gas or argon / nitrogen mixed gas may be used instead of nitrogen gas. Similar results were obtained. Moreover, in the said Example, although the glass plate was employ | adopted as a dielectric barrier which forms the silent discharge space 33, even if it replaced the glass plate with the insulating ceramic plate, the substantially same result was obtained. Therefore, it is considered that the silent silent discharge barrier may be a dense material having high electrical insulation. Moreover, even if the high voltage applied to the silent discharge space 33 is a pulse wave voltage, the PCB-containing oil can be rendered harmless without any problem.

  Further, using the PCB-containing oil detoxifying apparatus according to the present invention shown in FIG. 1, the flow rate ratio between the PCB-containing oil supplied to the reactor 1 and the nitrogen gas is adjusted under the processing conditions shown in Table 1 below. Adjust the spray nozzle pattern to match the inlet shape of the silent discharge space, and perform silent discharge processing as fine oil mist or droplets so that the PCB-containing oil cannot be visually recognized. The treated oil recovered in the treated oil recovery section A4 is returned to the pressure vessel 7 and reprocessed, and the reprocessing procedure is repeated 6 times to discharge the initial PCB-containing oil state before the detoxification process. When the number of times of discharge processing was set to 0 and the residual PCB concentration in the processed oil recovered by the processed oil recovery unit A4 was measured after the completion of the first, third and sixth discharge processes, Remaining PCB concentration change was as shown in FIG. That is, FIG. 4 shows the change in the PCB residual concentration with respect to the number of discharge treatments, and shows the effect that the PCB residual concentration after the sixth discharge treatment is substantially halved with respect to the initial PCB residual concentration of 26 ppm. In the above embodiment, the discharge treatment process is performed in one step and the repetition treatment is performed six times. However, it is more effective to further increase the number of repetition treatments by making the discharge treatment step a multi-stage treatment.

  PCBs have many isomers depending on the number and position of chlorine substitution, and their toxicity varies greatly. Therefore, it is important to efficiently dechlorinate and detoxify. In this invention, oil containing PCB is atomized, dropletized or vaporized and sprayed, and the chlorine-containing oil is released from the sprayed PCB-containing oil by silent discharge energy, thereby detoxifying the PCB-containing oil. However, since the current during silent discharge is very small due to the presence of a dielectric barrier such as a glass plate, the operating cost of the apparatus is low and the reliability of long-time operation is high. Further, since the voltage applied to the silent discharge system may be about 10 kV, it can be used even with a normal neon transformer, so that it is very economical in terms of the device price. Furthermore, the detoxification reaction can be performed at normal temperature and pressure, and no special catalyst or chemical is required. Therefore, the detoxification method and equipment are extremely easy to handle, and no residue is generated by the detoxification process. . Therefore, the practical effect of the present invention is extremely great.

  The detoxification treatment of PCB-containing oil that is currently stored continuously is a major and urgent issue in the industry. The detoxification treatment method for PCB-containing oil and the detoxification treatment apparatus according to the present invention are It is thought that it can be used greatly to remove negative heritage.

  The block diagram of the detoxification processing apparatus of PCB containing oil which concerns on this invention.   The perspective view of the silent discharge system of the same detoxification processing apparatus.   Sectional drawing of the silent discharge system cut | disconnected by the S-S 'line | wire of FIG.   The PCB residual density change figure with respect to the frequency | count of the discharge process in the detoxification processing method of the PCB containing oil which concerns on this invention.

A1: detoxification reaction unit A2: PCB-containing oil supply unit A3: High voltage power supply unit A4: treated oil recovery unit 1: Reactor 2: Spray nozzle 3: a silent discharge system 4: the lower row Preparative 5: outlet pipe 6: PCB containing oil 7: Pressure vessel 8: Nitrogen gas cylinder 9: Gas side pressure reducing valve 10, 12, 15: Pipe 11: Liquid side pressure reducing valve 13: Pressure adjusting valve 14: Liquid flow rate adjusting valve 16: High voltage power source (high voltage power source) Trance)
16a: High voltage output terminal 17 of the high voltage power supply 17: Voltmeter 18: Ammeter 20: Collection vessel 21: Mist trap 22: Hexane trap 23: Activated carbon trap 31: Thin plate-shaped discharge electrode plate 31a: Electrode group (grounding) Electrode plate)
31b: Electrode group ( connecting electrode plate to high voltage output terminal of high voltage power supply )
32: Flat dielectric silent discharge barrier (glass plate)
33: Silent discharge space 34: Spacer

Claims (2)

A spray nozzle (2) that is supplied with PCB-containing oil and an inert gas to atomize and eject the PCB-containing oil; and a plurality of plate-like plates each provided with a thin plate-like discharge electrode plate (31) The dielectric silent discharge barriers (32) are juxtaposed via the spacer (34), and a silent discharge space (33) is formed between the opposing dielectric silent discharge barriers (32) and (32). The discharge electrode plates (31) are alternately selected to form two electrode groups (31a) (31b), one of which is a ground electrode, and the other electrode group (31b). A silent discharge system (3) which is a high voltage output terminal (16a) of a high voltage power supply (16); disposed inside the reactor (1) of the PCB-containing oil detoxification treatment reaction part (A1) Uses detoxification equipment for PCB-containing oil Supplying the PCB-containing oil with the inert gas to the spray nozzle (2), and supplying the inert gas to the spray nozzle (2) separately, thereby supplying the PCB-containing oil from the spray nozzle (2). A PCB-containing oil characterized in that the PCB-containing oil is atomized and ejected, and the PCB-containing oil thus ejected is circulated in the silent discharge space (33) to convert the PCB in the PCB-containing oil into a harmless substance. Detoxification treatment method. A spray nozzle (2) that is supplied with PCB-containing oil and an inert gas to atomize and eject the PCB-containing oil; and a plurality of plate-like plates each provided with a thin plate-like discharge electrode plate (31) The dielectric silent discharge barriers (32) are juxtaposed via the spacer (34), and a silent discharge space (33) is formed between the opposing dielectric silent discharge barriers (32) and (32). The discharge electrode plates (31) are alternately selected to form two electrode groups (31a) (31b), one of which is a ground electrode, and the other electrode group (31b). A silent discharge system (3) having a connection terminal to the high voltage output terminal (16a) of the high voltage power supply (16); the inside of the reactor (1) of the PCB-containing oil detoxification treatment reaction part (A1) Arranged in A detoxifying device for PCB-containing oil, characterized in that

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