JPH07124271A - PCB disassembling method and PCB disassembling apparatus - Google Patents

Abstract

(57) [Abstract] [Purpose] The decomposition rate of PCB solution is high, and the structure is simple,
It is an object of the present invention to provide a PCB decomposing method and a PCB decomposing apparatus that can be processed in a short time and at low cost and have little secondary contamination due to a waste liquid or a waste gas after the processing. [Structure] A pretreatment section 12 for injecting ozone into a PCB solution and mixing ion water, stirring and heating the PCB solution, and the pretreated PCB solution are made into a mist in the form of fine particles. A primary treatment part 14 which stirs, heats, and irradiates a light beam, and ozone is injected into the PCB solution treated by this primary treatment part 14 and at the same time, minute bubbles are generated to irradiate the foamed raw material with a light beam. By including the subsequent processing unit 116, the decomposition rate of the PCB solution is high, the structure is simple, and the processing can be performed at a low cost in a short time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a PCB disassembling method and a PCB disassembling apparatus.

[0002]

2. Description of the Related Art Conventionally, PCB (polychlorinated biphenyl)
Has excellent properties such as heat resistance, chemical resistance, and electrical insulation,
It was used as a heating medium for heat treatment, an additive for paints and inks, and an insulating agent for capacitors and transformers. However, since PCB has been identified as a harmful substance that pollutes the environment, its production has been discontinued, and although it has been collected, it is stored in a tank without an effective disposal method. Various studies are being conducted to safely dispose of these PCBs. For example, in a low-concentration PCB solution, (1) a method of disposing with radiation, (2) a method of decomposing with a microorganism, (3 ) There are adsorption methods, etc., and for concentrated PCB solutions, (4) incineration method, (5) decomposition method by heating at high temperature in alkaline solution, (6) decomposition method with combination chemical of sodium and naphthalene, etc. are proposed. Has been done.

[0003]

However, each of the above decomposition methods has an advantage, and high combustion energy is required in high temperature heating, which requires a large burden on electric power or fuel cost. The decomposition rate is low,
When using chemicals chemically, the cost is high and there is a difficulty in handling. In addition, the incineration method is economical even if it involves problems such as fuel cost, but when the incineration temperature drops, chlorinated dioxins (CDD) and chlorinated dibenzofurans (PCDF), which are more toxic than PCB, are used. There was a problem such as a risk of secondary pollution of the environment.

The present invention has been made in view of the above-mentioned conventional problems, and an object thereof is a P having a simple structure, an excellent resolution ratio, and a low cost burden, which is very suitable for practical use.
An object is to provide a CB decomposing method and a PCB decomposing device.

[0005]

In order to achieve the above-mentioned object, the present invention provides a step of injecting ozone into a PCB solution and mixing ion water with the PCB solution,
It comprises a method for decomposing a PCB, which includes a step of stirring the solution and a step of heating the PCB solution.

Further, the PCB solution may be sprayed in the form of mist.

In addition, an ozone injection step of the PCB solution,
A step of irradiating with a light beam may be included in addition to any step of the step of mixing ion water, the step of stirring, the step of heating, and the like.

It is also possible to include a step of generating extremely small bubbles in the PCB solution.

Further, a pretreatment step of injecting ozone into the PCB solution, mixing ion water into the PCB solution, and heating the PCB solution while stirring, and the pretreated P solution
The method of decomposing a PCB includes a step of mist-forming the CB solution into fine particles, injecting ozone into the mist-like raw material, heating while stirring, and irradiating with a light beam.

In addition, a pretreatment step of injecting ozone into the PCB solution, mixing ion water into the PCB solution, and heating the PCB solution while stirring, and the pretreated P
The CB solution is made into a mist in the form of fine particles, the mist-like raw material is heated while being stirred, and the primary step of irradiating with a light beam and ozone is injected into the PCB solution treated in this primary step, and at the same time, minute bubbles are generated. And a second step of irradiating the cellular material with light rays, and a method for decomposing the PCB.

Next, a pretreatment section 1 for pretreating the PCB solution
2 and a decomposition processing unit 14 for decomposing the PCB solution processed by the pretreatment unit 12, and the pretreatment unit 12
Is a sealed pretreatment tank 18, an ozone generator 20 communicated with the pretreatment tank 18, an ion water generator 22 communicated with the pretreatment tank 18, and a solution provided in the pretreatment tank 18. The decomposition treatment section 14 has a heating section 24 and a solution stirring section 26 provided in the pretreatment tank 18, and the decomposition treatment section 14 is a sealed decomposition treatment tank 56 and a PCB treated in the pretreatment section 12.
A mist-forming supply unit 58 connected to the decomposition treatment tank 56 from the pretreatment tank 18 so as to mist the solution into fine particles to be supplied to the decomposition treatment tank 56, and an ozone generation unit connected to the decomposition treatment tank 56. 20, a mist stirring unit 60 for stirring the mist-like raw material in the decomposition treatment tank 56, a mist heating unit 62 for heating the mist-like raw material in the decomposition treatment tank 56, and the outside of the decomposition treatment tank 56. And a light source unit 92 for irradiating the mist-like raw material with light rays.

A pretreatment unit 1 for pretreating the PCB solution
2, a primary decomposition processing unit 14 for decomposing the PCB solution processed by the preprocessing unit 12, and a primary decomposition processing unit 1
4 is provided with a secondary decomposition processing unit 116 for decomposing the PCB solution, and the pretreatment unit 12 includes a sealed pretreatment tank 18 and an ozone generation unit 20 communicating with the pretreatment tank 18. An ionized water generating section 22 communicated with the pretreatment tank 18, a solution heating section 24 provided in the pretreatment tank 18,
And a solution stirring unit 26 provided in the pretreatment tank 18,
The primary decomposition treatment section 14 includes a sealed primary decomposition treatment tank 56 and the pretreatment tank to mist the PCB solution treated in the pretreatment section 12 into fine particles and supply the mist to the primary decomposition treatment tank 56. The mist-forming supply unit 58 communicated with the primary decomposition treatment tank 56 from 18, the ozone generation unit 20 communicated with the primary decomposition treatment tank 56, and the primary decomposition treatment tank 5
Mist stirring section 60 for stirring the mist-like raw material in 6
A mist heating section 62 for heating the mist-like raw material in the primary decomposition treatment tank 56, and a light source section 92 for irradiating the mist-like raw material with light rays from the outside of the primary decomposition treatment tank 56. The decomposition processing unit 116 includes a sealed secondary decomposition processing tank 118 and the primary decomposition processing unit 118 to generate minute bubbles in the PCB solution processed by the primary decomposition processing unit 116 and to supply the bubbles to the secondary decomposition processing tank 118. A bubble generating part 120 communicating from the decomposition treatment tank 56 to the secondary decomposition treatment tank 118;
The ozone generating section 20 communicated with the bubble generating section 120
And a light source section 122 for irradiating the bubble-shaped raw material with light in the secondary decomposition treatment tank 118.

Further, the solution stirring section 26 is provided in the pretreatment tank 1
8, a rotary blade 44 vertically installed, and a spiral blade 4 formed of a needle bar 46 protruding from the rotary shaft 44 and arranged in a spiral shape.
8 may be provided.

Further, the bubble generating part 120 includes a sealed container 124, a rotary shaft 30 vertically installed in the container 124, and a tooth profile 132 fixed to the rotary shaft 130 on an end surface thereof.
May be provided with a stirring blade 134 engraved with.

[0015]

According to the PCB decomposing method and the PCB decomposing apparatus of the present invention, the PCB solution is housed in the pretreatment tank of the pretreatment section, the ozone gas from the ozone generating section is injected, and the ion water generating section is injected. Ionized water is mixed and the PCB solution is pretreated with stirring and heating. This pre-treated PCB solution is mist-formed into fine particles into the primary decomposition treatment section through the mist-forming supply section, ozone gas is injected into the mist-like raw material, and the mixture is stirred by the mist stirring section and the mist heating section. While heating, it is irradiated with light rays for primary decomposition treatment.

Next, the PCB solution subjected to the primary decomposition treatment is fed to the secondary decomposition treatment section, and ozone gas is injected into the bubble generation section to agitate at high speed to generate extremely small bubbles. The foamed raw material is subjected to a secondary decomposition treatment while being irradiated with light rays and stored in a waste liquid tank. Further, the chlorine gas generated in each processing unit is collected in the exhaust pipe, and is detoxified by the ozone water in the waste gas processing unit and is discharged to the outside. As a result, the decomposition rate of the PCB solution is high, the structure is simple, the cost burden is low, the handling is easy, and there is no risk of secondary contamination due to waste liquid or waste gas after processing.

[0017]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows a PCB disassembling apparatus 1 for carrying out a PCB disassembling method according to a first embodiment of the present invention.
A system diagram of 0 is shown. As is clear from the figure, the PCB apparatus 10 includes a pretreatment unit 12 for pretreatment of a PCB solution, a primary decomposition treatment unit 14 for decomposing the PCB solution treated by the pretreatment unit 12, and And a waste gas processing unit 16 for processing the chlorine gas discharged from the processing unit 12 and the primary decomposition processing unit 14.

The pretreatment unit 12 has a sealed pretreatment tank 18 and an ozone generator 2 communicating with the pretreatment tank 18.
0 and the ion water generating part 22 communicated with the pretreatment tank 18
And a solution heating section 24 and a solution stirring section 26 provided in the pretreatment tank 18. In the pretreatment tank 18, a lid 28 is detachably fitted to the upper end opening, and a water supply pipe 34 extended from a water supply pump 32 connected to an externally-containing PCB solution storage tank 30 is located in front of the lid 28. It communicates with the inside of the processing tank 18.

The ozone generator 20 is equipped with an oxygen cylinder, an ozone maker, and an ozone rectifier that discharges a predetermined amount of ozone, which are not shown. An air supply pipe 36 extending from the ozone generator 20 is a pretreatment tank. It is connected to 18. Effectiveness can be achieved by setting the concentration of ozone gas supplied from the ozone generator 20 to approximately 1000 ppm or more. For example, when the concentration of the PCB solution is about 100 ppm, ozone gas adjusted to about 1000 ppm is supplied and injected into the PCB solution. These numerical values are merely preferable numerical values, and the density is not necessarily limited to these numerical values, and an appropriate density may be selected.

The ionized water generating section 22 removes ionized impurities such as chlorine contained while allowing normal water to flow therethrough, and purifies the ionized water into PC in the pretreatment tank 18.
The solution B is supplied with water and mixed. Pretreatment tank 18
Ionized water having a volume ratio of about 10% is mixed with the PCB solution therein to promote the oxidizing action of the PCB solution together with the injected ozone gas.

The solution heating section 24 is composed of a ribbon heater (trade name) 38 circulated around the outer peripheral surface of the pretreatment tank 18. The ribbon heater 38 of the solution heating unit 24 is connected to a temperature sensing element 40 arranged in the pretreatment tank 18 to constantly heat the PCB solution stored in the pretreatment tank 18 to about 80 to 90 ° C. To accelerate the reaction. The solution heating unit 24 is not limited to the ribbon heater 38, and other electric heaters may be used.

The solution stirring section 26 is, as shown in FIG.
A rotary shaft 44 vertically installed from the stirring motor 42 installed on the upper surface of the lid 28 into the pretreatment tank 18, and the rotary shaft 44.
And a spiral blade 48 composed of a needle bar 46 arranged in a spiral shape. The rotation shaft 44 of the stirring motor 42 is rotated at a high speed of about 10,000 rotations for about 1 minute to stir the PCB solution and accelerate the oxidation reaction of the PCB solution.

An exhaust pipe 50 for exhausting internally generated chlorine gas to the waste gas processing section 16 is connected to the lid 28,
Further, a stop valve 52 is communicated with a lower position of the pretreatment tank 18, and a liquid supply pipe 54 is extended from the stop valve 52 to the next decomposition processing section 14. In this preprocessing unit 12,
A predetermined amount of ozone gas is injected into the PCB solution W stored in the pretreatment tank 18, ion water is mixed, and the mixture is heated and stirred for about 15 to 20 minutes to accelerate the oxidation reaction of the PCB solution and decompose it. The chlorine gas thus generated is gradually exhausted from the exhaust pipe 50.

As shown in FIG. 3, the primary decomposition processing unit 14
Is a closed primary decomposition treatment tank 56 and the pretreatment unit 1
Since the PCB solution treated in 2 is atomized into the primary decomposition treatment tank 56 in the form of fine particles, the pretreatment tank 18 is used.
From the mist forming supply section 5 communicating with the primary decomposition treatment tank 56 from the
8, an ozone generating unit 20 communicating with the primary decomposition treatment tank 56, a mist stirring unit 60 for stirring the mist-like raw material in the primary decomposition treatment tank 56, and a heating unit for heating the mist-like raw material. 62 and.

The primary decomposition treatment tank 56 is preferably molded from a transparent resin, glass, or the like, so that the PCB solution W being decomposed inside the primary decomposition treatment tank 56 can be easily confirmed. This primary decomposition treatment tank 56
A lid 64 is detachably fitted to the upper end opening of the.

As shown in FIG. 3, the mist forming and supplying section 58.
Is connected to a mist pump 66 connected to a liquid supply pipe 54 extending from the stop valve 52 of the pretreatment tank 18 and from the mist pump 66 through a lid 64 into the primary decomposition treatment tank 56. The air supply pipe 68, and a circulating liquid supply pipe 72 that communicates with the mist pump 66 from a stop valve 70 that communicates with the vicinity of the inner bottom portion of the primary decomposition treatment tank 56.

PCB pretreated in the pretreatment tank 18
The solution W is sucked by the mist pump 66, made into mist in the form of fine particles, and injected into the primary decomposition treatment tank 56. In the primary decomposition treatment tank 56, a lid 64 is provided with an air supply branch pipe 74 branched from the air supply pipe 36 connected to the ozone generator 20.
Via the lid 64, and an exhaust pipe 76 for exhausting chlorine gas generated inside the primary decomposition treatment tank 56 is connected to the vicinity of the inner bottom portion of the primary decomposition treatment tank 56 via the lid 64. It communicates with the exhaust pipe 50 extended from 12.

As shown in FIG. 3, the mist stirring section 60 is provided.
Is a magnetic stirrer (trade name) 80 installed on the upper surface side of a pedestal 78 on which the primary decomposition treatment tank 56 is mounted, and an electromagnetic induction of the magnetic stirrer 80 arranged on the inner bottom surface of the primary decomposition treatment tank 56. And a rotor 82 having a substantially elliptical cross section that rotates at high speed by the action. Further, the mist stirring unit 60 includes a stirring motor 84 installed on the upper surface of the lid 62 to assist the stirring by the rotor 82.
The rotary shaft 86 vertically extends from the stirring motor 84 toward the inner bottom surface of the decomposition treatment tank 18, and the stirring blade 88 fixed to the rotary shaft 86.

The PCB solution W pretreated in the pretreatment section 12 is supplied to the primary decomposition treatment tank 56 through the mist pump 66 in the form of fine particles into the primary decomposition treatment tank 56.
This mist-like raw material M gradually descends to 1
It is agitated by the rotor 82 rotating 500 to 3000 times.
When the concentration of the PCB solution is approximately 500 ppm or more and the viscosity is high, the stirring blade 88 is simultaneously rotated to assist the stirring.

The mist heating section 62 comprises a heater 90 built in the magnetic stirrer 80 of the mist stirring section 60. The heater 90 is linked to a temperature sensing element 91 inserted in the primary decomposition treatment tank 56, and the inside of the primary decomposition treatment tank 56 is always heated to about 180 ° C.
However, it is not always necessary to use a magnetic stirrer as the mist stirring section 60 and the mist heating section 62, and a normal stirring blade, an electric heater or the like may be used.

As shown in FIG. 3, the primary decomposition treatment tank 56 is provided.
From the outside of the same secondary decomposition treatment tank 56.
A light source unit 92 for irradiating a light beam is provided. The light source unit 92 is arranged around the outer frame 9 of the primary decomposition treatment tank 56 from a substantially middle position to a lower position on the outer peripheral surface thereof.
4 and the electrode 9 arranged on the inner peripheral surface side of the outer frame body 94.
6 and 6 are provided. As the electrode 96, for example, a carbon rod electrode is used, and a light beam having a wavelength of about 400 to 850 microns (including ultraviolet rays, visible rays, infrared rays, etc.) is irradiated from the carbon rod electrode.

As a result, the mist-like raw material M atomized into mist in the form of fine particles in the primary decomposition treatment tank 56 is injected with ozone gas from the air supply branch pipe 74 and agitated by the mist agitator 60. The oxidation reaction is promoted by the heating from the mist heating section 62, and further, by irradiating a light beam from the light source section 92 to the stirred and heated mist-like raw material, the light irradiation rate to the particulate raw material is increased and the decomposition reaction Can be improved. The mist-like raw material M, which is a mist of the PCB solution W, is condensed and liquefied as the decomposition reaction is promoted and stored on the inner bottom surface of the primary decomposition treatment tank 56, and the initially transparent PCB solution is decomposed into carbon particles. Springs out and discolors into black tar. The primary decomposition treatment tank 56
Instead of the light source unit 92 installed on the outer periphery of the mist-shaped raw material, an electrode rod may be inserted into the primary decomposition treatment tank 56 to directly irradiate the mist-like raw material with light rays.

While confirming the discolored state of the PCB solution from the outside of the transparent primary decomposition treatment tank 56, when the decomposition rate is increased, the stop valve 70 of the circulating liquid supply pipe 72 is opened and the mist pump 66 is re-opened. By circulating, the decomposition rate of the PCB solution in the decomposition processing section 14 can be improved. Although the primary decomposition treatment unit 14 is connected to the pretreatment unit 12 in this embodiment, the present invention is not limited to this, and only the pretreatment unit 12 that heats and agitates the PCB solution contained in the pretreatment tank 18 is used. However, it is possible to decompose the PCB solution.

A stop valve 98 is connected to a position near the inner bottom of the primary decomposition treatment tank 56, and the stop valve 98 is connected to the stop valve 98.
A waste liquid tank 100 that stores the waste liquid after being decomposed is connected. Further, the chlorine gas decomposed in the primary decomposition treatment tank 56 is sent from the exhaust pipe 76 to the exhaust gas treatment unit 16 via the exhaust pipe 50.

As shown in FIG. 4, the exhaust gas treating section 16
Is a sealed tank body 102, and this tank body 102
An air supply pipe 104 which is communicated with the inside of the tank, extends from the ozone generating section 20, a circulation pump 106 which communicates with an inner bottom portion of the tank body 102, and a circulation pump 106 communicates with an upper position of the tank body 102. Circulating water supply pipe 108
And are equipped with.

An end portion of an exhaust pipe 50, which is connected to the pretreatment section 12 and the decomposition processing section 14 and exhausts decomposed chlorine gas, is connected to a position of the circulating water supply pipe 108 in the vicinity of the circulating water discharge port. There is. On the upper surface of the sealed tank body 102, a purifying cylinder 110 filled with a filter or activated carbon inside.
Are in communication.

Water is supplied and stored in the tank body 102 through a water injection port 112 on the upper surface, and an air supply pipe 104 is stored in the stored water.
The ozone gas is injected from the same and is circulated by the circulation pump 106 to be stored as ozone water 114.
Chlorine gas is adsorbed in ozone water while being supplied with chlorine gas from the exhaust pipe 50. Also, the tank body 102
A part of the chlorine gas remaining inside is discharged to the outside through the purifying cylinder 110, the chlorine gas is adsorbed to the activated carbon and the filter in the purifying cylinder 110, and the chlorine gas is harmlessly discharged to the outside. Is.

As described above, the PC according to the embodiment of the present invention
According to the method for decomposing B and the apparatus 10 for decomposing PCB, the PCB solution W in the storage tank 30 is stored in the pretreatment tank 18 of the pretreatment unit 12 by the water supply pump 32. Ozone gas is injected into the PCB solution W from the ozone generating unit 20, and the volume ratio of the PCB solution W from the ion water generating unit 22 is approximately 10%.
% Of deionized water is mixed. After that, the PCB solution W is pretreated for about 15 to 20 minutes while being stirred at a high speed by the ribbon heater 38 to about 90 to 100 ° C. while being rapidly stirred by the spiral blade 48 in which the needle bar 46 is spirally arranged. As a result, the oxidation reaction of the PCB solution W is promoted by the injected and mixed ozone gas and ion water.

Next, the pretreated PCB solution W is supplied into the primary decomposition processing section 14 via the mist forming supply section 58. The pre-treated PCB solution W is the mist pump 6
In step 6, the mist agitation unit using the magnetic stirrer 80 is injected into the primary decomposition treatment tank 56 of the primary decomposition treatment unit 14 in the form of fine particles, and the injected mist raw material M is injected with ozone gas again. 60 and mist heating unit 62 for about 1000 to 3000 per minute
It is heated to about 180 ° C. while being agitated by rotation.

Further, a light source portion 92 installed outside the primary decomposition treatment tank 56 irradiates a light beam having a wavelength of about 400 to 850 microns, whereby the mist raw material M is formed.
The PCB is decomposed and condensed and liquefied while releasing chlorine gas to be accumulated as a black tar-like waste liquid in the inner bottom portion of the primary decomposition treatment tank 56, and the waste liquid is sequentially discharged and stored in the waste liquid tank 100. By decomposing the PCB solution in the pretreatment unit 12 and the primary decomposition treatment unit 14 described above, about 70% of the PCB contained in the untreated PCB solution is decomposed.

The preprocessing unit 12 and the primary decomposition processing unit 14 are also provided.
Chlorine gas generated during decomposition of the PCB solution therein is transferred into the exhaust gas processing unit 16 by the exhaust pipe 50, and is injected into the ozone water 114 stored in the closed tank body 102 of the exhaust gas processing unit 16. While the chlorine gas is being adsorbed on the ozone water 114, the remaining waste gas is purified by the purifying cylinder 110.
After being purified and detoxified via, it is released to the outside.

Therefore, when the PCB solution is treated by the PCB decomposing method and the PCB decomposing apparatus according to the present invention,
Ordinary equipment can be used for injection of ozone gas, mixing of ion water, stirring, heating, etc., and it is not necessary to keep the heating temperature high, and the resolution is simple and the resolution is excellent. The handling is easy, the processing time is short, and the processing cost is low. In addition, there is no danger of secondarily polluting the environment.

Next, referring to FIGS. 5 and 6, a PCB disassembling apparatus 10 for carrying out the PCB disassembling method according to the second embodiment of the present invention.
It is shown. As shown in the system diagram of FIG. 5, the PCB decomposition apparatus 10 of the second embodiment performs a primary decomposition treatment on the pretreatment unit 12 for pretreatment of the PCB solution and the PCB solution treated by the pretreatment unit 12. Primary decomposition processing section 14, secondary decomposition processing section 116 for secondary decomposition processing of the PCB solution processed by this primary decomposition processing section 14, said pre-processing section 12, primary decomposition processing section 14, secondary decomposition processing section And a waste gas treatment unit 16 that treats chlorine gas discharged from the air conditioner 116 and the like.

In the present embodiment, the PCB solution decomposed by the pretreatment section 12 and the primary decomposition treatment section 14 is further decomposed by the secondary decomposition treatment section 116 to obtain P
The decomposition rate of the CB solution can be increased to a value close to about 100%.

Primary decomposition treatment of the pretreatment tank 18, ozone generator 20, ion water generator 22, solution heating unit 24, solution stirring unit 26, and primary decomposition treatment unit 14 of the pretreatment unit 12 of the second embodiment. The tank 56, the mist forming supply unit 58, the mist stirring unit 60, the mist heating unit 62, the light source unit 92, the waste gas processing unit 16 and the like are the same as those in the first embodiment, and the same members are designated by the same reference numerals. However, its detailed description is omitted.

The secondary decomposition processing unit 116 generates a small amount of bubbles in the sealed secondary decomposition processing tank 118 and the PCB solution processed by the primary decomposition processing unit 14 to generate the secondary decomposition processing tank 118. Bubble generator 120 for supplying to
And the ozone generator 2 communicating with the bubble generator 120.
0, and a light source section 122 for directly irradiating a light beam to the bubble-shaped raw material inside the secondary decomposition treatment tank 118.

As shown in FIG. 6, the bubble generating section 120.
Includes a container 124 made of a corrosion-resistant metal such as stainless steel and formed in a cup shape, and a lid 126 that is detachably fitted to an upper end opening of the container 124. This lid 1
An agitating motor 128 is installed on the upper surface of 26, a rotating shaft 130 of the agitating motor 128 is hung vertically to the inner bottom of the container 124, and a tooth profile 132 is engraved on the end face of the lower end of the rotating shaft 130. A plurality of stirring blades 134 are fixed.

At a position near the inner bottom of the container 122,
A metering pump 136 connected to a stop valve 98 that communicates with the primary decomposition treatment tank 56 is communicated with the metering pump 1.
36 includes a level switch 1 provided in the container 124.
38 is connected. An air supply branch pipe 140 branched from the air supply pipe 104 extending from the ozone generator 20 is communicated with the inner bottom of the container 124.
A bubble feeding pipe 142 is connected to the upper surface of the primary decomposition treatment tank 56 from the upper peripheral side surface of the above.

As a result, ozone gas is injected from the ozone generator 20 while supplying the PCB solution that has been subjected to the primary decomposition treatment in the primary decomposition treatment unit 14 into the container 124, and the stirring blade 128 is rotated by the stirring motor 128 for 1 minute. About 3000
PC supplied by stirring at high speed about 0 revolutions
The solution B becomes tiny bubbles of 100 micron unit containing ozone gas.

Further, inside the container 124, there is provided a guide plate 144 for feeding and guiding the bubble-shaped raw material B generated inside to the bubble feeding pipe 142, and chlorine gas generated inside the container 124. Exhaust pipe 146 for exhausting the lid 1
26 via the pre-processing unit 12 and the primary decomposition processing unit 14
Is connected to an exhaust pipe 50 extending from the.

The secondary decomposition treatment tank 118 is made of a metal such as cast iron and is formed into a substantially spherical shell. The bubble feeding pipe 142 is provided on the upper surface side of the secondary decomposition treatment tank 118.
And an exhaust pipe 148 are communicated with each other, and a filter pipe 150 having a filter filled therein is projected on the lower surface side. The lower end of the filter tube 150 is connected to the waste liquid tank 100 via an opening / closing valve 152. The exhaust pipe 14
8 is the exhaust pipe 50 extending from the primary processing unit 14 side
Is in communication with.

As shown in FIG. 6, the light source unit 122 is an electrode holding unit installed at both sides of a bubble feeding pipe 142 communicating with the upper surface side of the spherical shell-like secondary decomposition treatment tank 118. 154 and 154, and electrode rods 156 and 156 such as carbon rods protruding from the electrode holding portions 154 and 154 toward the substantially central portion of the secondary decomposition treatment tank 118.

When a voltage is applied to the electrode rods 156, 156 in the proximity state, arc discharge is generated between the electrode rods 156, 156. The bubble-like raw material B is discharged from the bubble supply pipe 142 within the interval of this arc discharge, and the bubble-like raw material B is substantially completely decomposed and liquefied by the light and heat radiation by the arc discharge, and sequentially stored in the waste liquid tank 100. To be done. At the same time, the chlorine gas generated in the secondary decomposition treatment tank 118 is exhausted from the exhaust pipe 148 via the exhaust pipe 50 to the waste gas treatment unit 16
Sent to and processed. The secondary decomposition treatment tank 118
Instead of directly irradiating the light source by the arc discharge to the bubble-shaped raw material B inside, a light source unit is installed outside the secondary decomposition treatment tank 118 to indirectly irradiate the light beam to decompose the PCB in the bubble-shaped raw material. Good.

As described above, in the PCB disassembling method and the PCB disassembling apparatus according to the second embodiment of the present invention,
The PCB solution W is housed in the pretreatment tank 18 of the pretreatment unit 12, the Ozo gas from the ozone generating unit 20 is injected, and the ion water is mixed from the ion water generating unit 22.
The solution W is pretreated for about 15 to 20 minutes while stirring and heating. The pretreated PCB solution is mist-ized into fine particles and injected into the primary decomposition treatment tank 56 of the primary decomposition treatment unit 14 via the mist supply unit 58. Ozone gas is injected into the mist material M again, and while being stirred and heated by the mist stirring section 60 and the mist heating section 62, light rays are emitted from a light source section 92 installed outside the primary decomposition treatment tank 56. As a result, the mist raw material M is decomposed, condensed and liquefied, and stored in the inner bottom portion of the primary decomposition treatment tank 56 in the form of black tar.

Next, the PCB solution that has been decomposed in the primary decomposition treatment tank 56 and accumulated at the inner bottom is subjected to the secondary decomposition treatment unit 1.
It is supplied to the bubble generation part 120 with 16 metering pumps 136. A fixed amount of PC is placed in the container 124 of the bubble generating unit 120.
The solution B is supplied, and ozone gas is injected from the air supply branch pipe 140 communicated with the ozone generation unit 20. Then, the stirring blades 134 are stirred at high speed to generate extremely small bubbles of 100 micron unit.

This foamed raw material B is successively subjected to a secondary decomposition treatment tank 1
18 and the foamed raw material B is supplied to the secondary decomposition treatment tank 1
While being directly touched by the light from the light source unit 122 installed inside 18, it is decomposed, condensed and liquefied, and sequentially stored in the waste liquid tank 100. The chlorine gas generated in the pretreatment tank 18, the primary decomposition treatment tank 56, and the secondary decomposition treatment tank 118 is collectively exhausted to the exhaust pipe 50 and stored in the tank body 102 of the waste gas treatment unit 16. It is detoxified with ozone water and exhausted to the outside.

Therefore, also in the PCB disassembling method and the PCB disassembling apparatus of the second embodiment, the resolution is high with a simple structure, and the decomposition rate of the PCB solution can be increased to a state close to about 100%. It can be decomposed in a short time, and the processing cost is low. Moreover, there is almost no risk of secondary pollution due to waste liquid or waste gas.

Next, 500 cc of PCB solution having a PCB concentration of 183 mg / liter was treated with the decomposition treatment apparatus of the first embodiment for about 10 minutes for the pretreatment tank 18 and about 2 hours for the temporary decomposition treatment tank 56. Processed in. P of this treatment solution
The CB concentration was 19.4 mg / liter. That is,
About 90% of the contained PCB components are decomposed,
It can be seen that the resolution rate is excellent.

[0059]

As described above, the PC according to the present invention
According to the decomposition method of B, a pretreatment step of injecting ozone into the PCB solution and mixing ionized water, and heating the PCB solution while stirring is performed, and the pretreated PCB solution is mist-ized into fine particles. Including the step of injecting ozone into this mist-like raw material, heating it with stirring, and irradiating it with light rays, the decomposition rate of the PCB solution is high, and the structure is simple, so a high level of handling is required. In addition, it can be processed at low cost in a short time.

Further, according to another PCB decomposition method of the present invention, a pretreatment step of injecting ozone into the PCB solution, mixing ion water, and heating the PCB solution with stirring, and the pretreatment. The PCB solution is made into a mist in the form of fine particles, the mist-like raw material is heated while being stirred, and a light beam is irradiated, and a PC treated in this primary step
The second step of injecting ozone into the solution B and generating extremely small bubbles and irradiating the foamed raw material with light rays results in a high decomposition rate of the PCB solution and a simple structure, so that it is easy to handle. Without the need for advanced technology,
It can be processed in a short time and at low cost, and there is almost no secondary pollution due to waste liquid or waste gas after processing.

Next, the apparatus for decomposing a PCB according to the present invention comprises a pretreatment section for pretreating the PCB solution and a decomposing section for decomposing the PCB solution treated by the pretreatment section. The pretreatment unit is a sealed pretreatment tank,
An ozone generating section communicated with the pretreatment tank, an ionized water generating section communicated with the pretreatment tank, a solution heating section provided in the pretreatment tank, and a solution stirring section provided in the pretreatment tank. The decomposition treatment section has a closed decomposition treatment tank, and a mist-forming supply section that is in communication with the decomposition treatment tank for making the PCB solution treated in the pretreatment section mist into fine particles. , An ozone generation unit communicated with the decomposition treatment tank, a mist stirring unit for stirring the mist-like raw material in the decomposition treatment tank, a mist heating unit for heating the mist-like raw material in the decomposition treatment tank, By having an indirect light source unit that irradiates the mist-like raw material with light from the outside of the decomposition treatment tank, the decomposition rate of the PCB solution is high, and the structure for processing the PCB solution stepwise is simple, Expenses are cheap, and operation of equipment is sophisticated That without any required, can safely perform the processing work in a short time.

According to another apparatus for decomposing PCBs of the present invention, a pretreatment section for pretreating the PCB solution, a primary decomposing section for decomposing the PCB solution treated by the pretreatment section, and And a secondary decomposition treatment unit for decomposing the PCB solution treated in the primary decomposition treatment unit, wherein the pretreatment unit includes a sealed pretreatment tank and an ozone generation unit communicating with the pretreatment tank. , An ionized water generating section communicated with the pretreatment tank, a solution heating section provided in the pretreatment tank, and a solution stirring section provided in the pretreatment tank, the primary decomposition treatment section, A closed primary decomposition treatment tank, a mist-forming supply unit that communicates with the primary decomposition treatment tank in order to mist the PCB solution treated in the pretreatment unit into fine particles, and a communication with the primary decomposition treatment tank. Ozone generator and mist in the primary decomposition tank A mist stirring section for stirring the raw material, a mist heating section for heating the mist-like raw material in the primary decomposition treatment tank, and an indirect light source section for irradiating a light beam to the mist-like raw material from the outside of the primary decomposition treatment tank, The secondary decomposition processing section has a sealed secondary decomposition processing tank and a PCB solution processed in the primary decomposition processing section for generating extremely small bubbles and supplying the bubbles to the secondary processing tank. The bubble generating section, the ozone generating section communicating with the bubble generating section, and the direct light source section for irradiating the bubble-like raw material with light rays inside the secondary decomposition treatment tank are provided. The decomposition rate of the solution is dramatically increased, the process of processing the PCB solution is simple, the equipment cost is low, and no advanced technology is required to operate the equipment. After processing the PCB solution Almost no secondary pollution caused by waste and waste gas.

Further, the solution stirring section is provided with a rotating shaft vertically provided in the pretreatment tank, and a spiral blade which is provided on the rotating shaft so as to project from the rotating shaft and which is composed of needle bars arranged in a spiral shape. Thereby, the stirring rate of the PCB solution is high and the oxidation reaction can be promoted.

Further, the bubble generating section is provided with a sealed container, a rotary shaft vertically provided in the container, and a stirring blade fixed to the rotary shaft and having a tooth profile on its end face. By forming the solution, it is possible to continuously generate bubbles of a very small unit while stirring the solution at high speed.

[Brief description of drawings]

FIG. 1 is a system diagram of a PCB disassembling apparatus that implements a PCB disassembling method according to a first embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of a pretreatment unit which is a component of the PCB disassembling apparatus of FIG.

FIG. 3 is an enlarged cross-sectional view of the primary disassembly processing unit.

FIG. 4 is an enlarged cross-sectional view of a waste gas processing unit.

FIG. 5 is a system diagram of a PCB disassembling apparatus that implements a PCB disassembling method according to a second embodiment of the present invention.

6 is an enlarged cross-sectional view of a secondary decomposition processing unit in FIG.

[Explanation of symbols]

 10 PCB Decomposing Device 12 Pretreatment Section 14 Primary Decomposition Processing Section 16 Waste Gas Treatment Section 18 Pretreatment Tank 20 Ozone Generation Section 22 Ion Water Generation Section 24 Solution Heating Section 26 Solution Stirring Section 46 Needle Rod 49 Spiral Blade 56 Primary Decomposition Processing Tank 58 Mist supply section 60 Mist stirring section 62 Mist heating section 92 Light source section 116 Secondary decomposition processing section 118 Secondary decomposition processing section 120 Bubble generating section 122 Light source section 132 Tooth profile 134 Stirring blade

Claims (10)

[Claims] 1. A method for decomposing a PCB, which comprises the steps of injecting ozone into the PCB solution and mixing ion water with the PCB solution, stirring the PCB solution, and heating the PCB solution. 2. The method for decomposing PCB according to claim 1, wherein the PCB solution is sprayed in the form of mist. 3. The decomposition of PCB according to claim 1, further comprising a step of irradiating a light beam in addition to any step of ozone injection step of the PCB solution, mixing step of ionized water, stirring step, heating step and the like. Method. 4. The method for decomposing a PCB according to claim 1, further comprising the step of generating extremely small bubbles in the PCB solution. 5. A pretreatment step of injecting ozone into the PCB solution, mixing ion water with the PCB solution, and heating the PCB solution while stirring, and mist-forming the pretreated PCB solution into fine particles. And injecting ozone into this mist-like raw material, heating while stirring, and irradiating with a light beam. 6. A pretreatment step of injecting ozone into the PCB solution, mixing ion water into the PCB solution, and heating the PCB solution while stirring, and mist-forming the pretreated PCB solution into fine particles. Then, the mist-like raw material is heated while being stirred, and a primary step of irradiating with a light beam, and ozone is injected into the PCB solution treated in this primary step, and at the same time, minute bubbles are generated, and the light beam is emitted into this bubble-like raw material. A second step of irradiating, and a method for decomposing a PCB, comprising: 7. A pretreatment unit for pretreating a PCB solution, and a decomposition treatment unit for decomposing the PCB solution treated by the pretreatment unit, wherein the pretreatment unit is a sealed pretreatment tank. And an ozone generating section communicated with the pretreatment tank, an ionized water generating section communicated with the pretreatment tank, and a solution heating section provided in the pretreatment tank,
And a solution stirring section provided in the pretreatment tank, wherein the decomposition treatment section is a closed decomposition treatment tank, and the PCB solution treated in the pretreatment section is mist-ized into fine particles to decompose the decomposition solution. To stir the mist-forming feed unit that communicates from the pretreatment tank to the decomposition treatment tank so as to be supplied to the treatment tank, the ozone generation unit that communicates with the decomposition treatment tank, and the mist-like raw material in the decomposition treatment tank. Of mist stirring section, a mist heating section for heating the mist-like raw material in the decomposition treatment tank, and a light source section for irradiating the mist-like raw material with light from the outside of the decomposition treatment tank apparatus. 8. A pretreatment unit for pretreating a PCB solution, a primary decomposition treatment unit for decomposing the PCB solution treated by this pretreatment unit, and a PCB treated by this primary decomposition treatment unit.
A secondary decomposition treatment unit for decomposing the solution, and the pretreatment unit is a sealed pretreatment tank, an ozone generation unit communicated with the pretreatment tank, and an ion communicated with the pretreatment tank. A water generating part, a solution heating part provided in the pretreatment tank,
And a solution stirring unit provided in the pretreatment tank, wherein the primary decomposition treatment unit is a sealed primary decomposition treatment tank,
A mist-forming supply unit that communicates from the pretreatment tank to the primary decomposition treatment tank in order to mist the PCB solution treated in the pretreatment unit into fine particles and supply this to the primary decomposition treatment tank, and the primary decomposition treatment tank. An ozone generating section communicated with, a mist stirring section for stirring the mist-like raw material in the primary decomposition treatment tank, a mist heating section for heating the mist-like raw material in the primary decomposition treatment tank, and the primary decomposition A light source unit for irradiating a mist-like raw material with light from the outside of the treatment tank, wherein the secondary decomposition treatment unit is a sealed secondary decomposition treatment tank,
A bubble generation part communicated from the primary decomposition treatment tank to the secondary decomposition treatment tank so as to generate extremely small bubbles in the PCB solution treated in the primary decomposition treatment portion and to supply this to the secondary decomposition treatment tank, A decomposing device for a PCB, comprising: an ozone generating part in communication with a bubble generating part; and a light source part for irradiating a light beam to a bubble-shaped raw material in the secondary decomposition treatment tank. 9. The solution stirring unit includes a rotating shaft vertically provided in the pretreatment tank, and a spiral blade formed of a needle bar protruding from the rotating shaft and arranged in a spiral shape. The apparatus for decomposing a PCB according to claim 7 or 8. 10. The bubble generating part comprises a closed container, a rotary shaft vertically installed in the container, and a stirring blade fixed to the rotary shaft and having an end face with a tooth profile engraved. 9. The PCB decomposing device according to claim 8.