JPH10170695A - Treating method and treating equipment of radioactive waste liquid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform oxidizing or decomposing treatment on an organic substance in a radioactive waste liquid, and restrain generation of secondary waste by dissolving ozone in the waste liquid while circulating the radioactive waste liquid in a circulating loop composed of an ozone injecting tank and an ultraviolet ray irradiating tank, and irradiating ultraviolet rays to this waste liquid. SOLUTION: In a waste liquid, large refuse or the like is removed by a waste liquid pretreatment filter 10, and a hindrance to the circulation of the waste liquid by the refuse is prevented. In the waste liquid, a solid material such as an iron clad is precipitated and separated by a solid material separator 8, and only a supernatant liquid is sent to an ozone injecting tank 2. In the tank 2, ozone gas of an ozone generator 5 also reaches the tank 2, and dissolves in the waste liquid while rising in the waste liquid moving to a lower part from an upper part in the tank 2. The waste liquid by absorbing ozone is sent to an ultraviolet ray irradiating tank 1. The irradiating tank 1 has an ultraviolet ray irradiating lamp 1a, and irradiates ultraviolet rays to the waste liquid, and decomposes an organic substance in the liquid. The waste liquid circulates in this way, and is cooled by a waste liquid cooler 11 in the middle, and the dissolved ozone concentration is increased, and treatment necessary time can be shortened.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a waste liquid containing a surfactant such as a shower waste liquid, a hand wash waste liquid, and a laundry waste liquid which are generated in large quantities in a nuclear power plant (this waste liquid includes radioactive fine solids. Radioactive waste ").

[0002]

2. Description of the Related Art When treating a large amount of radioactive waste liquid in a nuclear power plant, from the viewpoint of reducing the volume of radioactive waste, organic substances such as surfactants contained in the waste liquid are removed, and only the organic substances are removed. Is reasonable to discard.

As one of the methods for treating radioactive waste liquid, a method for removing a surfactant from the waste liquid by adding activated carbon to the waste liquid to cause physical adsorption of the surfactant and then separating the activated carbon and the liquid is discussed. Have been. In this case, a method of separating adsorbed activated carbon and a liquid by filtration has recently been adopted.

On the other hand, as a treatment method that does not generate secondary waste such as used activated carbon, there is a method of oxidizing and decomposing organic components in a waste liquid using a high-output ultraviolet light source and an oxidizing agent such as ozone. It is discussed in Kaikai 52-22-66.

[0005]

SUMMARY OF THE INVENTION Among the above prior arts,
In the activated carbon filtration method, activated carbon becomes secondary waste,
This requires disposal and disposal, which raises the cost and burdens on the environment due to disposal.

Further, the above-mentioned conventional system using ultraviolet rays and ozone has a problem that the processing speed is lower than the generation speed of the waste liquid. Radioactive waste from nuclear power plants
Since the organic matter concentration is as high as about 200 ppm in COD and is generated in large amounts, it is necessary to increase the output of the ultraviolet light source. In that case, a large amount of heat generated from the ultraviolet light source raises the temperature of the waste liquid and lowers the dissolved concentration of ozone, which causes a problem that it is difficult to improve the processing speed. Further, in the treatment of the waste liquid containing a surfactant, there is a possibility that the radioactive substance may be scattered to the outside by air bubbles and the worker may be exposed to the radiation with an increase in temperature.

[0007] The physical mechanism in the treatment of organic-containing waste liquid using ultraviolet light and ozone is OH ^* by the reaction of ozone with ultraviolet light having a wavelength of 253.7 nm emitted from a mercury lamp or the like and ozone ^.
Generation of radicals (O ₃ + H ₂ O → O ₂ + 2OH ^* ), O
Oxidation of organic matter by H ^* radical (C _n H _2n + 2nOH
^* → nCO ₂ + 2nH ₂ ), but in order to quickly treat a large amount of high-concentration organic waste liquid with a limited-scale system, it is necessary to increase the output of a mercury lamp or the like and dissolve ozone. It is important to increase the amount of generated OH ^* radicals by increasing the amount of OH ^* .

In general, it is known that the solubility of a gas such as ozone in an aqueous solution increases according to Henry's law as the temperature decreases, and Table 1 below shows the temperature of each waste liquid in the aeration of ozone under the same conditions. , And the time required for organic matter decomposition (decomposition from 200 ppm to about 1 ppm by COD) when ultraviolet irradiation is performed.

[0009]

[Table 1]

As can be seen from Table 1 above, the waste liquid temperature is 2
When the temperature is higher than 0 ° C., the dissolved ozone concentration sharply decreases. Therefore, at a temperature of 40 ° C., the decomposition time is about twice as long as that at a temperature of 20 ° C. FIG. 1 shows an example of the relationship between the concentration of dissolved ozone at a waste liquid temperature of 20 ° C. and the time required for waste liquid treatment. In the region where the dissolved ozone concentration is about 20 ppm or less, the waste liquid treatment time rapidly increases with the concentration decrease.
In the region where the dissolved ozone concentration is about 20 ppm or more, the reduction of the waste liquid treatment time is saturated. This is 2OH ^* → H ₂
This is because the OH ^* radical generation amount is saturated by the O ₂ interference reaction. The present invention has been made in view of the above-described problems and findings in a method for treating an organic matter-containing waste liquid using ultraviolet light and ozone, and an object of the present invention is to suppress the generation of secondary waste and quickly reduce the amount of organic matter. It is an object of the present invention to provide a method and equipment for treating a radioactive waste liquid capable of oxidatively decomposing water. It is another object of the present invention to provide a radioactive liquid waste treatment method and treatment equipment capable of suppressing scattering of radioactive substances by bubbles.

[0011]

In order to achieve the above object, according to the first aspect of the present invention, while circulating a radioactive waste liquid in a circulation loop formed by connecting an ozone injection tank and an ultraviolet irradiation tank by a pipeline. And ozone is dissolved in the radioactive waste liquid, and the radioactive waste liquid in which the ozone is dissolved is irradiated with ultraviolet rays to oxidize or decompose the organic substances in the radioactive waste liquid, thereby treating the radioactive waste liquid. .

According to a second aspect of the present invention, in order to achieve the above object, in the first aspect, the radioactive waste liquid is cooled so that the temperature of the radioactive waste liquid does not rise and the dissolved ozone concentration does not decrease due to ultraviolet irradiation. The method is characterized in that the method is a method for treating a radioactive waste liquid in which the temperature is kept at 20 ° C. or lower. In order to achieve the above object, in claim 3 of the present invention, the pressure of the radioactive waste liquid is set to an upper limit of 50 atm so that the temperature of the radioactive waste liquid does not rise and the dissolved ozone concentration does not decrease due to ultraviolet irradiation. The following is a method for treating a radioactive waste liquid to be pressurized.
In order to achieve the above object, in claim 4 of the present invention, in claim 1, 2 or 3, before or during the treatment, the ultraviolet ray irradiation does not increase the temperature of the radioactive waste liquid to lower the dissolved ozone concentration. Alternatively, the method is characterized in that it is a method for treating a radioactive waste liquid in which the concentration of dissolved ozone in the radioactive waste liquid is measured and controlled by both.

[0013] In order to achieve the above object, according to claim 5 of the present invention, the organic matter concentration in the radioactive waste liquid is measured during and / or after the treatment, and the circulation loop It is a method of treating radioactive waste liquid that controls each device and detects the end of operation.

According to a sixth aspect of the present invention, there is provided an ozone injection tank for injecting ozone into the radioactive waste liquid, an ultraviolet irradiation tank for irradiating the radioactive waste liquid containing dissolved ozone with ultraviolet light, It is characterized by being a waste liquid circulation pump for transferring radioactive waste liquid, and a facility for treating radioactive waste liquid in which a piping and a circulation loop are formed to connect the above-mentioned devices.

According to a seventh aspect of the present invention, there is provided a treatment facility for radioactive waste liquid, wherein a waste liquid cooler for cooling the radioactive waste liquid is added to the treatment equipment according to claim 6 of the present invention. It is characterized by.

In order to achieve the above object, the present invention provides an apparatus for treating radioactive waste liquid, wherein the treatment equipment according to claim 6 is provided with a waste liquid pressurizer for pressurizing the radioactive waste liquid. It is characterized by.

According to a ninth aspect of the present invention, in order to achieve the above object, the treatment facility according to the sixth, seventh or eighth aspect is provided with a dissolved ozone concentration measuring device for measuring the dissolved ozone concentration in the radioactive waste liquid. It is a facility for treating radioactive waste liquid.

According to a tenth aspect of the present invention, in order to achieve the above object, the processing equipment according to the sixth, seventh or eighth aspect includes:
It is a radioactive waste liquid treatment facility provided with an organic substance concentration measuring device for measuring an organic substance concentration in the radioactive waste liquid.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION

(Embodiment 1) FIG. 3 shows a method of oxidizing or decomposing organic substances contained in an organic substance-containing waste liquid such as a laundry waste liquid generated from a nuclear power plant using ultraviolet rays and ozone emitted from a mercury lamp. 1 shows an embodiment of an apparatus for treating a radioactive waste liquid. In the present embodiment, the ultraviolet irradiation tank 1
Ozone injection tank 2, waste liquid circulation pumps 3a and 3b, waste liquid supply switching valve 4, ozone generator 5, ozone gas supply pipe 6, processing liquid discharge switching valve 7, solid separation device 8, processing liquid filtration device 9, waste liquid A pretreatment filter 10 and a waste liquid cooler 11 are provided.

The waste liquid tank filled with the radioactive waste liquid is connected to a processing device via a waste liquid pretreatment filter 10 and a waste liquid supply switching valve 4. When the waste liquid supply switching valve 4 is opened, the waste liquid in the waste liquid tank (radioactive waste liquid is abbreviated as waste liquid hereinafter) is introduced into the waste liquid pretreatment filter 10, passes through the waste liquid pretreatment filter 10, and is then discharged. Is supplied to the processing device via the. At that time, waste liquid pretreatment filter 1
At 0, large debris such as hair contained in the shower waste liquid and the like is removed. This processing prevents such waste from entering the processing apparatus main body and preventing circulation of the waste liquid.

The waste liquid supplied to the processing device first flows into the solid separation device 8. Solid matter such as iron clad in the waste liquid is settled and separated in the solid matter separation device 8, and only the supernatant liquid is sent to the ozone injection tank 2 by the waste liquid circulation pump 3a. Solid matter such as iron clad settled and separated by the solid matter separation device 8 is taken out after the batch operation of waste liquid treatment is completed.

The waste liquid supplied to the ozone injection tank 2 by the waste liquid circulation pump 3a through the processing liquid discharge switching valve 7 and the waste liquid cooler 11 flows in from the upper part of the ozone injection tank 2 and the lower part of the ozone injection tank 2 Spill out of. On the other hand, the ozone generator 5
The ozone gas generated in the above reaches the ozone injection tank 2 through the ozone gas supply pipe 6. The ozone gas supply pipe 6 is connected to a lower portion of the ozone injection tank 2 after passing once through a position higher than the height of the ozone injection tank 2. Therefore, the ozone gas that has reached the lower part of the ozone injection tank 2 is dissolved in the waste liquid while ascending in the waste liquid moving from the upper part to the lower part in the ozone injection tank 2.

The waste liquid having absorbed ozone in the ozone injection tank 2 is sent to the ultraviolet irradiation tank 1 by the waste liquid circulation pump 3b.
The ultraviolet irradiation tank 1 uses a metallic waste liquid tank as a container and has an ultraviolet irradiation lamp 1a therein. When the waste liquid is supplied to the waste liquid tank of the ultraviolet irradiation tank 1, the waste liquid is irradiated with ultraviolet light there, and organic substances in the waste liquid are decomposed. UV irradiation lamp 1
a is a mercury lamp, particularly a mercury vapor pressure inside the lamp is 1 × 10 ⁻² torr or more and 1 × 10 ² torr to 1 × 10 ⁻² torr.
A mercury lamp in a range of × 10 ⁴ torr is preferable, or an ultraviolet light source such as a xenon lamp may be used.

When the waste liquid is sufficiently supplied into the processing apparatus, the waste liquid supply switching valve 4 is switched to the circulation loop side, and a batch operation for decomposing organic substances in the waste liquid is started.

The waste liquid circulates as described above. At that time, the waste liquid is cooled by the waste liquid cooler 11. Usually, in waste liquid processing using a high-output ultraviolet light source, the temperature of the waste liquid increases from 20 ° C. to 30 ° C. before the start of processing, and the dissolved ozone concentration decreases by that much, so that the time required for waste liquid processing takes a long time. When the temperature of the waste liquid rises due to heat generation from the ultraviolet light source, the concentration of dissolved ozone is increased by cooling the waste liquid, and the waste liquid treatment time can be shortened.

On the other hand, when a surfactant such as an alkylbenzenesulfonic acid-based household detergent or a fatty acid-based soap is contained as a surfactant, the amount of foaming of the waste liquid increases as the temperature of the waste liquid increases (see FIG. 2). Therefore, scattering of the radioactive substance due to foaming due to cooling of the waste liquid is reduced.

After the decomposition of the organic substances is completed, the processing liquid discharge switching valve 7 is switched to send the waste liquid to the processing liquid filtration device 9 using the waste liquid circulation pump 3a and the waste liquid circulation pump 3b. In the treatment liquid filtration device 9, solids containing radioactive substances such as iron clad are precisely removed. Thereafter, the waste liquid is discharged out of the system.

The solid separation device 8 is provided with an ultraviolet light from the lower part of the ozone injection tank 2 instead of the present embodiment, which is installed before the waste liquid circulation pump 3a for sending waste liquid from the ultraviolet irradiation tank 1 to the upper part of the ozone injection tank 2. It can be installed before the waste liquid circulation pump 3b that sends the waste liquid to the irradiation tank 1.

The location of the waste liquid cooler 11 may be anywhere in the waste liquid circulation path. It is also effective to cool the waste liquid in advance before starting the waste liquid treatment, or to cool the waste liquid both before and during the treatment.

(Embodiment 2) FIG. 4 oxidizes or decomposes organic substances contained in organic substance-containing waste liquid such as laundry waste liquid generated from a nuclear power plant using ultraviolet rays and ozone emitted from a mercury lamp. 4 shows another embodiment of a radioactive liquid waste treatment apparatus to which the method is applied. In this embodiment,
UV irradiation tank 1, ozone injection tank 2, waste liquid circulation pump 3
a, 3b, a waste liquid supply switching valve 4, an ozone generator 5, an ozone gas supply pipe 6, a treatment liquid discharge switching valve 7, a treatment liquid filtration device 9, a waste liquid pretreatment filter 10, and a waste liquid pressurizer 12.

The waste liquid tank filled with the radioactive waste liquid is connected to a processing apparatus via a waste liquid pretreatment filter 10 and a waste liquid supply switching valve 4. When the waste liquid supply switching valve 4 is opened, the waste liquid in the waste liquid tank is introduced into the waste liquid pre-treatment filter 10, passes through the waste liquid pre-treatment filter 10, and is supplied to the processing device via the waste liquid supply switching valve 4. . that time,
The waste liquid pretreatment filter 10 removes large debris such as hair contained in the shower waste liquid and the like. With this process,
This prevents such dust from entering the apparatus main body and hindering the circulation of the waste liquid.

The waste liquid supplied to the processing apparatus is sent to the ozone injection tank 2 through the processing liquid discharge switching valve 7 by the waste liquid circulation pump 3a. The waste liquid flows in from the upper part of the ozone injection tank 2 and flows out from the lower part of the ozone injection tank 2. On the other hand, the ozone gas generated by the ozone generator 5 is supplied to an ozone gas supply pipe 6.
And reaches the ozone injection tank 2. The ozone gas supply pipe 6 is connected to a lower portion of the ozone injection tank 2 after passing once through a position higher than the height of the ozone injection tank 2. Therefore, the ozone gas that has reached the lower part of the ozone injection tank 2 is dissolved in the waste liquid while ascending in the waste liquid moving from the upper part to the lower part in the ozone injection tank 2. The waste liquid is pressurized by a waste liquid press 12 provided in the ozone injection tank 2. The pressurization increases the amount of ozone gas dissolved in the waste liquid, and reduces the time required for decomposing organic substances.

The waste liquid having absorbed ozone in the ozone injection tank 2 is sent to the ultraviolet irradiation tank 1 by the waste liquid circulation pump 3b.
The ultraviolet irradiation tank 1 uses a metallic waste liquid tank as a container and has an ultraviolet irradiation lamp 1a therein. When the waste liquid is supplied to the waste liquid tank of the ultraviolet irradiation tank 1, the waste liquid is irradiated with ultraviolet light there, and organic substances in the waste liquid are decomposed. UV irradiation lamp 1
a is a mercury lamp, and in particular, the mercury vapor pressure inside the lamp is 1 × 10 ⁻² torr or more and 1 × 10 ² torr to 1 × 10 ⁻² torr.
A mercury lamp in a range of × 10 ⁴ torr is preferable, or an ultraviolet light source such as a xenon lamp may be used.

When the waste liquid is sufficiently supplied into the processing apparatus, the waste liquid supply switching valve 4 is switched to the circulation loop side, and a batch operation for decomposing organic substances in the waste liquid is started.

After the decomposition of the organic substance is completed, the switching valve 7 for discharging the processing liquid is switched, and the waste liquid is sent to the processing liquid filtration device 9 using the waste liquid circulation pump 3a and the waste liquid circulation pump 3b. In the treatment liquid filtration device 9, solids containing radioactive substances such as iron clad are precisely removed. Thereafter, the waste liquid is discharged out of the system.

According to Henry's law, increasing the gas pressure in response to pressurization increases the solubility of the gas in the liquid. However, if the pressure is too high, the device cannot withstand normal material conditions. Therefore, the limit pressure that the device of the ozone injection tank 2 can withstand is determined and set as the upper limit of the pressurized pressure.

[0037] The ozone injection vessel 2 and the inner diameter D, the thickness d iron cylinder (height h >> D), a tensile break strength of iron G _0,
Assuming that the strength reduction coefficient due to material defects is 0.01 and the critical water pressure is P, the following equation 1 is approximately established.

P = 0.01 · G ₀ · (2d / D) Formula 1 When G _{0 is set} to 4.8 × 10 ¹⁰ N / m ² and the thickness of the ozone injection tank 2 is set to 1 mm and the inner diameter is set to 20 cm, P Becomes 50 atm.

(Embodiment 3) FIG. 5 shows the use of ultraviolet rays and ozone emitted from a mercury lamp to oxidize or decompose organic substances contained in organic substance-containing waste liquid such as laundry waste liquid generated from a nuclear power plant. 4 shows another embodiment of a radioactive liquid waste treatment apparatus to which the method is applied. In this embodiment,
UV irradiation tank 1, ozone injection tank 2, waste liquid circulation pump 3
a, 3b, waste liquid supply switching valve 4, ozone generator 5, ozone gas supply pipe 6, treatment liquid discharge switching valve 7, solids separation device 8, treatment liquid filtration device 9, waste liquid pretreatment filter 10, dissolved ozone concentration A measuring device 13 is provided.

The waste liquid tank filled with the radioactive waste liquid is connected to a processing apparatus via a waste liquid pretreatment filter 10 and a waste liquid supply switching valve 4. When the waste liquid supply switching valve 4 is opened, the waste liquid in the waste liquid tank is introduced into the waste liquid pre-treatment filter 10, passes through the waste liquid pre-treatment filter 10, and is supplied to the processing device via the waste liquid supply switching valve 4. . that time,
The waste liquid pretreatment filter 10 removes large debris such as hair contained in the shower waste liquid and the like. With this process,
This prevents such dust from entering the apparatus main body and hindering the circulation of the waste liquid.

The waste liquid supplied to the processing device first flows into the solid separation device 8. Solid matter such as iron clad in the waste liquid is settled and separated in the solid matter separation device 8, and only the supernatant liquid is sent to the ozone injection tank 2 by the waste liquid circulation pump 3a. Solid matter such as iron clad settled and separated by the solid matter separation device 8 is taken out after the batch operation of waste liquid treatment is completed.

The waste liquid supplied from the waste liquid circulation pump 3a to the ozone injection tank 2 via the processing liquid discharge switching valve 7 flows in from the upper part of the ozone injection tank 2 and flows out from the lower part of the ozone injection tank 2. On the other hand, the ozone gas generated by the ozone generator 5 reaches the ozone injection tank 2 through the ozone gas supply pipe 6. The ozone gas supply pipe 6 is connected to a lower portion of the ozone injection tank 2 after passing once through a position higher than the height of the ozone injection tank 2. Therefore, the ozone gas that has reached the lower part of the ozone injection tank 2 is dissolved in the waste liquid while ascending in the waste liquid moving from the upper part to the lower part in the ozone injection tank 2.

The waste liquid having absorbed ozone in the ozone injection tank 2 is subjected to a dissolved ozone concentration measuring device 1 by a waste liquid circulation pump 3b.
3 to the ultraviolet irradiation tank 1. UV irradiation tank 1
Uses a metallic waste liquid tank as a container and has an ultraviolet irradiation lamp 1a therein. When the waste liquid is supplied to the waste liquid tank of the ultraviolet irradiation tank 1, the waste liquid is irradiated with ultraviolet light there, and organic substances in the waste liquid are decomposed. The ultraviolet irradiation lamp 1a is a mercury lamp, and in particular, the mercury vapor pressure inside the lamp is 1 × 10 ^-2 t.
orr or more, from 1 × 10 ² torr to 1 × 10 ⁴ torr
A mercury lamp in the range of r is preferable, or an ultraviolet light source such as a xenon lamp may be used.

When the waste liquid is sufficiently supplied into the processing apparatus, the waste liquid supply switching valve 4 is switched to the circulation loop side, and a batch operation for decomposing organic substances in the waste liquid is started.

The dissolved ozone concentration measuring device 13 is installed at one or a plurality of locations in the waste liquid circulation path. The measurement result of the dissolved ozone concentration measuring device 13 is fed back to the ozone generator 5, and the control means 15 controls the supply amount of ozone gas in the ozone injection tank 2 or the ozone generator 5. In some cases, the temperature of the waste liquid rises due to the heat generated from the ultraviolet light source, and the dissolved ozone concentration decreases. In this case, the decrease in the concentration is detected and the supply amount of ozone is increased to prevent an increase in the processing time.

After the decomposition of the organic substances is completed, the waste liquid is sent to the treatment liquid filtration device 9 by switching the treatment liquid discharge switching valve 7 and using the waste liquid circulation pump 3a and the waste liquid circulation pump 3b. In the treatment liquid filtration device 9, solids containing radioactive substances such as iron clad are precisely removed. Thereafter, the waste liquid is discharged out of the system.

The solid separation device 8 is provided with an ultraviolet ray from the lower part of the ozone injection tank 2 instead of the present embodiment, which is installed in front of the waste liquid circulation pump 3a for sending waste liquid from the ultraviolet irradiation tank 1 to the upper part of the ozone injection tank 2. It can be installed before the waste liquid circulation pump 3b that sends the waste liquid to the irradiation tank 1.

(Embodiment 4) FIG. 6 oxidizes or decomposes organic substances contained in organic substance-containing waste liquid such as laundry waste liquid generated from a nuclear power plant using ultraviolet light and ozone emitted from a mercury lamp. 4 shows another embodiment of a radioactive liquid waste treatment apparatus to which the method is applied. In this embodiment,
UV irradiation tank 1, ozone injection tank 2, waste liquid circulation pump 3
a, 3b, waste liquid supply switching valve 4, ozone generator 5, ozone gas supply pipe 6, treatment liquid discharge switching valve 7, solids separation device 8, treatment liquid filtration device 9, waste liquid pretreatment filter 10, organic matter concentration measurement A vessel 14 is provided.

The waste liquid tank filled with the radioactive waste liquid is connected to a processing apparatus via a waste liquid pretreatment filter 10 and a waste liquid supply switching valve 4. When the waste liquid supply switching valve 4 is opened, the waste liquid in the waste liquid tank is introduced into the waste liquid pretreatment filter 10, passes through the waste liquid pretreatment filter 10, and is supplied to the processing device via the waste liquid supply switching valve 4. . that time,
The waste liquid pretreatment filter 10 removes large debris such as hair contained in the shower waste liquid and the like. With this process,
This prevents such dust from entering the apparatus main body and hindering the circulation of the waste liquid.

The waste liquid supplied to the treatment device flows into the solid separation device 8 via the organic matter concentration measuring device 14. Solid matter such as iron clad in the waste liquid is settled and separated in the solid matter separation device 8, and only the supernatant liquid is sent to the ozone injection tank 2 by the waste liquid circulation pump 3a. Solid matter such as iron clad settled and separated by the solid matter separation device 8 is taken out after the batch operation of waste liquid treatment is completed.

The waste liquid supplied from the waste liquid circulation pump 3a to the ozone injection tank 2 via the processing liquid discharge switching valve 7 flows in from the upper part of the ozone injection tank 2 and flows out from the lower part of the ozone injection tank 2. On the other hand, the ozone gas generated by the ozone generator 5 reaches the ozone injection tank 2 through the ozone gas supply pipe 6. The ozone gas supply pipe 6 is connected to a lower portion of the ozone injection tank 2 after passing once through a position higher than the height of the ozone injection tank 2. Therefore, the ozone gas that has reached the lower part of the ozone injection tank 2 is dissolved in the waste liquid while ascending in the waste liquid moving from the upper part to the lower part in the ozone injection tank 2.

The waste liquid having absorbed ozone in the ozone injection tank 2 is sent to the ultraviolet irradiation tank 1 by the waste liquid circulation pump 3b.
The ultraviolet irradiation tank 1 uses a metallic waste liquid tank as a container and has an ultraviolet irradiation lamp 1a therein. When the waste liquid is supplied to the waste liquid tank of the ultraviolet irradiation tank 1, the waste liquid is irradiated with ultraviolet light there, and organic substances in the waste liquid are decomposed. UV irradiation lamp 1
A is preferably a mercury lamp, particularly a mercury lamp having an internal mercury vapor pressure of 1 × 10 ⁻² torr or more and 1 × 10 ² to 1 × 10 ⁴ torr, or a xenon lamp. And the like.

When the waste liquid is sufficiently supplied into the processing apparatus, the waste liquid supply switching valve 4 is switched to the circulation loop side, and a batch operation for decomposing organic substances in the waste liquid is started.

The organic substance concentration measuring device 14 is installed at one or more locations in the waste liquid circulation loop. Organic substance concentration measuring instrument 14
The result of the measurement is as follows: UV irradiation tank 1, waste liquid circulation pump 3a,
3b, feedback to the ozone generator 5 to control the operation of the device.

After the decomposition of the organic substance is completed, the switching valve 7 for discharging the processing liquid is switched, and the waste liquid is sent to the processing liquid filtration device 9 using the waste liquid circulation pump 3a and the waste liquid circulation pump 3b. In the treatment liquid filtration device 9, solids containing radioactive substances such as iron clad are precisely removed. Thereafter, the waste liquid is discharged out of the system.

The solids separation device 8 is provided with an ultraviolet light from the lower part of the ozone injection tank 2 instead of the present embodiment, which is installed in front of the waste liquid circulation pump 3a for sending waste liquid from the ultraviolet irradiation tank 1 to the upper part of the ozone injection tank 2. It can be installed before the waste liquid circulation pump 3b that sends the waste liquid to the irradiation tank 1.

(Embodiment 5) FIG. 7 oxidizes or decomposes organic matter contained in organic matter-containing waste liquid such as laundry waste liquid generated from a nuclear power plant using ultraviolet light and ozone emitted from a mercury lamp. 4 shows another embodiment of a radioactive liquid waste treatment apparatus to which the method is applied. In this embodiment,
UV irradiation tank 1, ozone injection tank 2, waste liquid circulation pump 3
a, 3b, waste liquid supply switching valve 4, ozone generator 5, ozone gas supply pipe 6, treatment liquid discharge switching valve 7, solids separation device 8, treatment liquid filtration device 9, waste liquid pretreatment filter 10, waste liquid cooler 11, a dissolved ozone concentration measuring device 13 is provided.

The waste liquid tank filled with the radioactive waste liquid is connected to a processing apparatus via a waste liquid pretreatment filter 10 and a waste liquid supply switching valve 4. When the waste liquid supply switching valve 4 is opened, the waste liquid in the waste liquid tank is introduced into the waste liquid pretreatment filter 10, passes through the waste liquid pretreatment filter 10, and is supplied to the processing device via the waste liquid supply switching valve 4. . that time,
The waste liquid pretreatment filter 10 removes large debris such as hair contained in the shower waste liquid and the like. With this process,
This prevents such dust from entering the apparatus main body and hindering the circulation of the waste liquid.

The waste liquid supplied to the processing device flows into the solid separation device 8. Solid matter such as iron clad in the waste liquid is settled and separated in the solid matter separation device 8, and only the supernatant liquid is sent to the ozone injection tank 2 using the waste liquid circulation pump 3a. Solid matter such as iron clad settled and separated by the solid matter separation device 8 is taken out after the batch operation of waste liquid treatment is completed.

The waste liquid supplied to the ozone injection tank 2 by the waste liquid circulation pump 3a through the processing liquid discharge switching valve 7 and the waste liquid cooler 11 flows in from the upper part of the ozone injection tank 2 and the lower part of the ozone injection tank 2. Spill out of. On the other hand, the ozone generator 5
The ozone gas generated in step (1) reaches the ozone injection tank 2 through the ozone gas supply pipe 6. The ozone gas supply pipe 6 is connected to a lower portion of the ozone injection tank 2 after passing once through a position higher than the height of the ozone injection tank 2. Therefore, the ozone gas that has reached the lower part of the ozone injection tank 2 is dissolved in the waste liquid while ascending in the waste liquid moving from the upper part to the lower part in the ozone injection tank 2.

The waste liquid that has absorbed ozone in the ozone injection tank 2 is sent to the ultraviolet irradiation tank 1 by the waste liquid circulation pump 3b via the dissolved ozone concentration measuring device 13. UV irradiation tank 1
Uses a metallic waste liquid tank as a container and has an ultraviolet irradiation lamp 1a therein. When the waste liquid is supplied to the waste liquid tank of the ultraviolet irradiation tank 1, the waste liquid is irradiated with ultraviolet light there, and organic substances in the waste liquid are decomposed. The ultraviolet irradiation lamp 1a is a mercury lamp, and in particular, the mercury vapor pressure inside the lamp is 1 × 10 ^-2 t.
orr or more, from 1 × 10 ² torr to 1 × 10 ⁴ torr
A mercury lamp in the range of r is preferable, or an ultraviolet light source such as a xenon lamp may be used.

When the waste liquid is sufficiently supplied into the processing apparatus, the waste liquid supply switching valve 4 is switched to the circulation loop side, and a batch operation for decomposing organic substances in the waste liquid is started.

The waste liquid circulates as described above. At this time, the waste liquid is cooled by the waste liquid cooler 11. By cooling, the concentration of dissolved ozone in the waste liquid increases, and the time required for decomposing organic substances is reduced. In addition, since generation of bubbles is suppressed, scattering of radioactive substances is also reduced.

The dissolved ozone concentration measuring device 13 is installed at one or a plurality of locations in a waste liquid circulation loop. The measurement result of the dissolved ozone concentration measuring device 13 is fed back to the ozone generator 5, and the control means 15 controls the supply amount of ozone gas in the ozone injection tank 2 or the ozone generator 5. In some cases, the temperature of the waste liquid rises due to the heat generated from the ultraviolet light source, and the dissolved ozone concentration decreases. In this case, the decrease in the concentration is detected and the supply amount of ozone is increased to prevent an increase in the processing time.

After the decomposition of the organic substance is completed, the switching valve 7 for discharging the processing liquid is switched, and the waste liquid is sent to the processing liquid filtration device 9 using the waste liquid circulation pump 3a and the waste liquid circulation pump 3b. In the treatment liquid filtration device 9, solids containing radioactive substances such as iron clad are precisely removed. Thereafter, the waste liquid is discharged out of the system.

The solid material separation device 8 is provided with an ultraviolet light from the lower part of the ozone injection tank 2 instead of the present embodiment, which is provided in front of the waste liquid circulation pump 3a for sending the waste liquid from the ultraviolet irradiation tank 1 to the upper part of the ozone injection tank 2. It can be installed before the waste liquid circulation pump 3b that sends the waste liquid to the irradiation tank 1.

The location of the waste liquid cooler may be anywhere in the waste liquid circulation loop. It is also effective to cool the waste liquid in advance before starting the waste liquid treatment, or to cool the waste liquid both before and during the treatment.

(Embodiment 6) FIG. 8 oxidizes or decomposes organic substances contained in organic substance-containing waste liquid such as laundry waste liquid generated from a nuclear power plant using ultraviolet rays and ozone emitted from a mercury lamp. 4 shows another embodiment of a radioactive liquid waste treatment apparatus to which the method is applied. In this embodiment,
UV irradiation tank 1, ozone injection tank 2, waste liquid circulation pump 3
a, 3b, waste liquid supply switching valve 4, ozone generator 5, ozone gas supply pipe 6, treatment liquid discharge switching valve 7, treatment liquid filtration device 9, waste liquid pretreatment filter 10, waste liquid pressurizer 12, dissolved ozone concentration measurement A vessel 13 is provided.

The waste liquid tank filled with the radioactive waste liquid is connected to a processing apparatus via a waste liquid pretreatment filter 10 and a waste liquid supply switching valve 4. When the waste liquid supply switching valve 4 is opened, the waste liquid in the waste liquid tank is introduced into the waste liquid pretreatment filter 10, passes through the waste liquid pretreatment filter 10, and is supplied to the processing device via the waste liquid supply switching valve 4. . that time,
The waste liquid pretreatment filter 10 removes large debris such as hair contained in the shower waste liquid and the like. With this process,
This prevents such dust from entering the apparatus main body and hindering the circulation of the waste liquid.

The waste liquid supplied to the processing apparatus is sent to the ozone injection tank 2 through the processing liquid discharge switching valve 7 by the waste liquid circulation pump 3a. The waste liquid flows in from the upper part of the ozone injection tank 2 and flows out from the lower part of the ozone injection tank 2. On the other hand, the ozone gas generated by the ozone generator 5 reaches the ozone injection tank 2 through the ozone gas supply pipe 6. The ozone gas supply pipe 6 is connected to a lower portion of the ozone injection tank 2 after passing once through a position higher than the height of the ozone injection tank 2. Therefore, the ozone gas that has reached the lower part of the ozone injection tank 2 is dissolved in the waste liquid while ascending in the waste liquid moving from the upper part to the lower part in the ozone injection tank 2. The waste liquid is pressurized by a waste liquid press 12 provided in the ozone injection tank 2. The pressurization increases the amount of ozone gas dissolved in the waste liquid, and reduces the time required for decomposing organic substances.

The waste liquid that has absorbed ozone in the ozone injection tank 2 is sent to the ultraviolet irradiation tank 1 by the waste liquid circulation pump 3b via the dissolved ozone concentration measuring device 13. UV irradiation tank 1
Uses a metallic waste liquid tank as a container and has an ultraviolet irradiation lamp 1a therein. When the waste liquid is supplied to the waste liquid tank of the ultraviolet irradiation tank 1, the waste liquid is irradiated with ultraviolet light there, and organic substances in the waste liquid are decomposed. The ultraviolet irradiation lamp 1a is a mercury lamp, and in particular, the mercury vapor pressure inside the lamp is 1 × 10 ^-2 t.
orr or more, from 1 × 10 ² torr to 1 × 10 ⁴ torr
A mercury lamp in the range of r is preferable, or an ultraviolet light source such as a xenon lamp may be used.

When the waste liquid is sufficiently supplied into the processing apparatus, the waste liquid supply switching valve 4 is switched to the circulation loop side, and a batch operation for decomposing organic substances in the waste liquid is started.

The dissolved ozone concentration measuring device 13 is installed at one or a plurality of locations in a waste liquid circulation loop. The measurement result of the dissolved ozone concentration measuring device 13 is fed back to the ozone generator 5, and the control means 15 controls the supply amount of ozone gas in the ozone injection tank 2 or the ozone generator 5. In some cases, the temperature of the waste liquid rises due to the heat generated from the ultraviolet light source, and the concentration of dissolved ozone decreases.

After the decomposition of the organic substances is completed, the processing liquid discharge switching valve 7 is switched, and the waste liquid is sent to the processing liquid filtration device 9 using the waste liquid circulation pump 3a and the waste liquid circulation pump 3b. In the treatment liquid filtration device 9, solids containing radioactive substances such as iron clad are precisely removed. Thereafter, the waste liquid is discharged out of the system.

(Embodiment 7) FIG. 9 oxidizes or decomposes organic matter contained in organic matter-containing waste liquid such as laundry waste liquid generated from a nuclear power plant using ultraviolet light and ozone emitted from a mercury lamp. 4 shows another embodiment of a radioactive liquid waste treatment apparatus to which the method is applied. In this embodiment,
UV irradiation tank 1, ozone injection tank 2, waste liquid circulation pump 3
a, 3b, waste liquid supply switching valve 4, ozone generator 5, ozone gas supply pipe 6, treatment liquid discharge switching valve 7, solids separation device 8, treatment liquid filtration device 9, waste liquid pretreatment filter 10, waste liquid cooler 11, an organic matter concentration measuring device 14 is provided.

The waste liquid tank filled with the radioactive waste liquid is connected to a processing apparatus via a waste liquid pretreatment filter 10 and a waste liquid supply switching valve 4. When the waste liquid supply switching valve 4 is opened, the waste liquid in the waste liquid tank is introduced into the waste liquid pretreatment filter 10, passes through the waste liquid pretreatment filter 10, and is supplied to the processing device via the waste liquid supply switching valve 4. . that time,
The waste liquid pretreatment filter 10 removes large debris such as hair contained in the shower waste liquid and the like. This prevents these debris from entering the apparatus main body and hindering the circulation of the waste liquid.

The waste liquid supplied to the treatment device flows into the solid separation device 8 via the organic matter concentration measuring device 14. Solid matter such as iron clad in the waste liquid is settled and separated in the solid matter separation device 8, and only the supernatant liquid is sent to the ozone injection tank 2 using the waste liquid circulation pump 3a. Settling in solid separation device 8
The solid matter such as the separated iron clad is taken out after the batch operation of the waste liquid treatment is completed.

The waste liquid supplied to the processing apparatus is sent to the ozone injection tank 2 through the processing liquid discharge switching valve 7 and the waste liquid cooler 11 by the waste liquid circulation pump 3a. The waste liquid flows in from the upper part of the ozone injection tank 2 and flows out from the lower part of the ozone injection tank 2. On the other hand, the ozone gas generated by the ozone generator 5 reaches the ozone injection tank 2 through the ozone gas supply pipe 6. The ozone gas supply pipe 6 is connected to a lower portion of the ozone injection tank 2 after passing once through a position higher than the height of the ozone injection tank 2. Therefore, the ozone gas that has reached the lower part of the ozone injection tank 2 is dissolved in the waste liquid while ascending in the waste liquid moving from the upper part to the lower part in the ozone injection tank 2.

The waste liquid having absorbed ozone in the ozone injection tank 2 is sent to the ultraviolet irradiation tank 1 by the waste liquid circulation pump 3b. The ultraviolet irradiation tank 1 uses a metallic waste liquid tank as a container,
An ultraviolet irradiation lamp 1a is provided therein. When the waste liquid is supplied to the waste liquid tank of the ultraviolet irradiation tank 1, the waste liquid is irradiated with ultraviolet light there, and organic substances in the waste liquid are decomposed. As the ultraviolet irradiation lamp 1a, a mercury lamp, particularly a mercury lamp having an internal mercury vapor pressure of 1 × 10 ⁻² torr or more and 1 × 10 ² to 1 × 10 ⁴ torr is preferable. Alternatively, an ultraviolet light source such as a xenon lamp may be used.

When the waste liquid is sufficiently supplied into the processing apparatus, the waste liquid supply switching valve 4 is switched to the circulation loop side, and a batch operation for decomposing organic substances in the waste liquid is started.

The waste liquid circulates as described above. At this time, the waste liquid is cooled by the waste liquid cooler 11. By cooling, the concentration of dissolved ozone in the waste liquid increases, and the time required for decomposing organic substances is reduced. In addition, since generation of bubbles is suppressed, scattering of radioactive substances is also reduced.

The organic matter concentration measuring device 14 is provided at one or more places in the waste liquid circulation loop. Organic substance concentration measuring instrument 14
The result of the measurement is as follows: UV irradiation tank 1, waste liquid circulation pump 3a,
3b, feedback to the ozone generator 5 to control the operation of the device.

After the decomposition of the organic substances is completed, the processing liquid discharge switching valve 7 is switched to send the waste liquid to the processing liquid filtration device 9 using the waste liquid circulation pump 3a and the waste liquid circulation pump 3b. In the treatment liquid filtration device 9, solids containing radioactive substances such as iron clad are precisely removed. Thereafter, the waste liquid is discharged out of the system.

The solids separation device 8 is provided with an ultraviolet ray from the lower part of the ozone injection tank 2 instead of the present embodiment, which is installed in front of the waste liquid circulation pump 3a for sending waste liquid from the ultraviolet irradiation tank 1 to the upper part of the ozone injection tank 2. It can be installed before the waste liquid circulation pump 3b that sends the waste liquid to the irradiation tank 1.

The location of the waste liquid cooler 11 may be anywhere in the waste liquid circulation loop. Cool the waste liquid before starting waste liquid treatment,
Alternatively, it is effective to perform cooling both before the start of the process and during the process.

(Embodiment 8) FIG. 10 oxidizes or decomposes organic substances contained in organic substance-containing waste liquid such as laundry waste liquid generated from a nuclear power plant using ultraviolet light and ozone emitted from a mercury lamp. 4 shows another embodiment of a radioactive liquid waste treatment apparatus to which the method is applied. In this embodiment, an ultraviolet irradiation tank 1, an ozone injection tank 2, waste liquid circulation pumps 3a and 3b, a waste liquid supply switching valve 4, an ozone generator 5, an ozone gas supply pipe 6, a processing liquid discharge switching valve 7, a processing liquid The apparatus includes a filtration device 9, a waste liquid pretreatment filter 10, a waste liquid pressurizer 12, and an organic matter concentration measuring device 14.

The waste liquid tank filled with the radioactive waste liquid is connected to a processing apparatus via a waste liquid pretreatment filter 10 and a waste liquid supply switching valve 4. When the waste liquid supply switching valve 4 is opened, the waste liquid in the waste liquid tank is introduced into the waste liquid pretreatment filter 10, passes through the waste liquid pretreatment filter 10, and is supplied to the processing device via the waste liquid supply switching valve 4. . that time,
The waste liquid pretreatment filter 10 removes large debris such as hair contained in the shower waste liquid and the like. With this process,
This prevents such dust from entering the apparatus main body and hindering the circulation of the waste liquid.

The waste liquid supplied to the processing apparatus is sent to the ozone injection tank 2 via the processing liquid discharge switching valve 7 by the waste liquid circulation pump 3a. The waste liquid flows in from the upper part of the ozone injection tank 2 and flows out from the lower part of the ozone injection tank 2. On the other hand, the ozone gas generated by the ozone generator 5 is supplied to an ozone gas supply pipe 6.
To reach the ozone injection tank 2. The ozone gas supply pipe 6 is connected to a lower portion of the ozone injection tank 2 after passing once through a position higher than the height of the ozone injection tank 2. Therefore, the ozone gas that has reached the lower part of the ozone injection tank 2 is dissolved in the waste liquid while ascending in the waste liquid moving from the upper part to the lower part in the ozone injection tank 2. The waste liquid is pressurized by a waste liquid press 12 provided in the ozone injection tank 2. The pressurization increases the amount of ozone gas dissolved in the waste liquid, and reduces the time required for decomposing organic substances.

The waste liquid having absorbed ozone in the ozone injection tank 2 is sent to the ultraviolet irradiation tank 1 by the waste liquid circulation pump 3b. The ultraviolet irradiation tank 1 uses a metallic waste liquid tank as a container,
An ultraviolet irradiation lamp 1a is provided therein. When the waste liquid is supplied to the waste liquid tank of the ultraviolet irradiation tank 1, the waste liquid is irradiated with ultraviolet light there, and organic substances in the waste liquid are decomposed. As the ultraviolet irradiation lamp 1a, a mercury lamp, particularly a mercury lamp having an internal mercury vapor pressure of 1 × 10 ⁻² torr or more and 1 × 10 ² to 1 × 10 ⁴ torr is preferable. Alternatively, an ultraviolet light source such as a xenon lamp may be used.

When the waste liquid is sufficiently supplied into the processing apparatus, the waste liquid supply switching valve 4 is switched to the circulation loop side, and a batch operation for decomposing organic substances in the waste liquid is started.

The organic substance concentration measuring device 14 is installed at one or more places in the waste liquid circulation loop. Organic substance concentration measuring instrument 14
The result of the measurement is as follows: UV irradiation tank 1, waste liquid circulation pump 3a,
3b, feedback to the ozone generator 5 to control the operation of the device.

After the decomposition of the organic substances is completed, the processing liquid discharge switching valve 7 is switched to send the waste liquid to the processing liquid filtration device 9 using the waste liquid circulation pump 3a and the waste liquid circulation pump 3b. In the treatment liquid filtration device 9, solids containing radioactive substances such as iron clad are precisely removed. Thereafter, the waste liquid is discharged out of the system.

(Embodiment 9) FIG. 11 oxidizes or decomposes organic substances contained in organic substance-containing waste liquid such as laundry waste liquid generated from a nuclear power plant using ultraviolet rays and ozone emitted from a mercury lamp. 4 shows another embodiment of a radioactive liquid waste treatment apparatus to which the method is applied. In this embodiment, an ultraviolet irradiation tank 1, an ozone injection tank 2, waste liquid circulation pumps 3a and 3b, a waste liquid supply switching valve 4, an ozone generator 5, an ozone gas supply pipe 6, a treatment liquid discharge switching valve 7, a solid material Separation device 8, treatment liquid filtration device 9, waste liquid pretreatment filter 10,
A waste liquid cooler 11, a dissolved ozone concentration measuring device 13, and an organic matter concentration measuring device 14 are provided.

The waste liquid tank filled with the radioactive waste liquid is connected to a processing apparatus via a waste liquid pretreatment filter 10 and a waste liquid supply switching valve 4. When the waste liquid supply switching valve 4 is opened, the waste liquid in the waste liquid tank is introduced into the waste liquid pretreatment filter 10, passes through the waste liquid pretreatment filter 10, and is supplied to the processing device via the waste liquid supply switching valve 4. . that time,
The waste liquid pretreatment filter 10 removes large debris such as hair contained in the shower waste liquid and the like. This prevents these debris from entering the apparatus main body and hindering the circulation of the waste liquid.

The waste liquid supplied to the processing device flows into the solid separation device 8 via the organic matter concentration measuring device 14. Solid matter such as iron clad in the waste liquid is settled and separated in the solid matter separation device 8, and only the supernatant liquid is sent to the ozone injection tank 2 using the waste liquid circulation pump 3a. Settling in solid separation device 8
The solid matter such as the separated iron clad is taken out after the batch operation of the waste liquid treatment is completed.

The waste liquid supplied to the processing apparatus is supplied to the processing liquid discharge switching valve 7 and the waste liquid cooler 1 by the waste liquid circulation pump 3a.
1 to the ozone injection tank 2. The waste liquid flows in from the upper part of the ozone injection tank 2 and flows out from the lower part of the ozone injection tank 2. On the other hand, the ozone gas generated by the ozone generator 5 reaches the ozone injection tank 2 through the ozone gas supply pipe 6. The ozone gas supply pipe 6 is connected to a lower portion of the ozone injection tank 2 after passing once through a position higher than the height of the ozone injection tank 2. Therefore, the ozone gas that has reached the lower part of the ozone injection tank 2 is dissolved in the waste liquid while ascending in the waste liquid moving from the upper part to the lower part in the ozone injection tank 2.

The waste liquid having absorbed ozone in the ozone injection tank 2 is sent to the ultraviolet irradiation tank 1 by the waste liquid circulation pump 3b.
The ultraviolet irradiation tank 1 uses a metallic waste liquid tank as a container and has an ultraviolet irradiation lamp 1a therein. When the waste liquid is supplied to the waste liquid tank of the ultraviolet irradiation tank 1, the waste liquid is irradiated with ultraviolet light there, and organic substances in the waste liquid are decomposed. UV irradiation lamp 1
a is a mercury lamp, and in particular, the mercury vapor pressure inside the lamp is 1 × 10 ⁻² torr or more and 1 × 10 ² torr to 1 × 10 ⁻² torr.
A mercury lamp in a range of × 10 ⁴ torr is preferable, or an ultraviolet light source such as a xenon lamp may be used.

When the waste liquid is sufficiently supplied into the processing apparatus, the waste liquid supply switching valve 4 is switched to the circulation loop side, and a batch operation for decomposing organic substances in the waste liquid is started.

The waste liquid circulates as described above. At this time, the waste liquid is cooled by the waste liquid cooler 11. By cooling, the concentration of dissolved ozone in the waste liquid increases, and the time required for decomposing organic substances is reduced. In addition, since generation of bubbles is suppressed, scattering of radioactive substances is also reduced.

The dissolved ozone concentration measuring device 13 is provided at one or a plurality of positions in a waste liquid circulation loop. The measurement result of the dissolved ozone concentration measuring device 13 is fed back to the ozone generator 5, and the control means 15 controls the supply amount of ozone gas in the ozone injection tank 2 or the ozone generator 5. In some cases, the temperature of the waste liquid rises due to heat generated from the ultraviolet light source, and the concentration of dissolved ozone decreases.

The organic matter concentration measuring device 14 is provided at one or more places in the waste liquid circulation loop. Organic substance concentration measuring instrument 14
The result of the measurement is as follows: UV irradiation tank 1, waste liquid circulation pump 3a,
3b, feedback to the ozone generator 5 to control the operation of the device.

After the decomposition of the organic substances is completed, the processing liquid discharge switching valve 7 is switched, and the waste liquid is sent to the processing liquid filtration device 9 using the waste liquid circulation pump 3a and the waste liquid circulation pump 3b. In the treatment liquid filtration device 9, solids containing radioactive substances such as iron clad are precisely removed. Thereafter, the waste liquid is discharged out of the system.

The solid separation device 8 is provided with an ultraviolet ray from the lower part of the ozone injection tank 2 instead of the present embodiment, which is installed in front of the waste liquid circulation pump 3a for sending waste liquid from the ultraviolet irradiation tank 1 to the upper part of the ozone injection tank 2. It can be installed before the waste liquid circulation pump 3b that sends the waste liquid to the irradiation tank 1.

The location of the waste liquid cooler 11 may be anywhere in the waste liquid circulation loop. Cool the waste liquid before starting waste liquid treatment,
Alternatively, it is effective to perform cooling both before the start of the process and during the process.

(Embodiment 10) FIG. 12 shows that ultraviolet light and ozone emitted from a mercury lamp are used to oxidize or decompose organic matter contained in organic matter-containing waste liquid such as laundry waste liquid generated from a nuclear power plant. 4 shows another embodiment of a radioactive liquid waste treatment apparatus to which the method is applied. In this embodiment, an ultraviolet irradiation tank 1, an ozone injection tank 2, waste liquid circulation pumps 3a and 3b, a waste liquid supply switching valve 4, an ozone generator 5, an ozone gas supply pipe 6, a processing liquid discharge switching valve 7, a processing liquid The apparatus includes a filtration device 9, a waste liquid pretreatment filter 10, a waste liquid pressurizer 12, a dissolved ozone concentration measuring device 13, and an organic matter concentration measuring device 14.

The waste liquid tank filled with the radioactive waste liquid is connected to a processing apparatus via a waste liquid pretreatment filter 10 and a waste liquid supply switching valve 4. When the waste liquid supply switching valve 4 is opened, the waste liquid in the waste liquid tank is introduced into the waste liquid pretreatment filter 10, passes through the waste liquid pretreatment filter 10, and is supplied to the processing device via the waste liquid supply switching valve 4. . that time,
The waste liquid pretreatment filter 10 removes large debris such as hair contained in the shower waste liquid and the like. This prevents these debris from entering the apparatus main body and hindering the circulation of the waste liquid.

The waste liquid supplied to the processing apparatus is sent to the ozone injection tank 2 by the waste liquid circulation pump 3a through the organic substance concentration measuring device 14 and the processing liquid discharge switching valve 7. The waste liquid is
It flows in from the upper part of the ozone injection tank 2 and flows out from the lower part of the ozone injection tank 2. On the other hand, the ozone gas generated by the ozone generator 5 reaches the ozone injection tank 2 through the ozone gas supply pipe 6. The ozone gas supply pipe 6 is connected to a lower portion of the ozone injection tank 2 after passing once through a position higher than the height of the ozone injection tank 2. Therefore, the ozone gas that has reached the lower part of the ozone injection tank 2 is dissolved in the waste liquid while ascending in the waste liquid moving from the upper part to the lower part in the ozone injection tank 2. The waste liquid is pressurized by a waste liquid press 12 provided in the ozone injection tank 2. The pressurization increases the amount of ozone gas dissolved in the waste liquid, and reduces the time required for decomposing organic substances.

The waste liquid that has absorbed ozone in the ozone injection tank 2 is subjected to a dissolved ozone concentration measuring device 1 by a waste liquid circulation pump 3b.
3 to the ultraviolet irradiation tank 1. UV irradiation tank 1
Uses a metallic waste liquid tank as a container and has an ultraviolet irradiation lamp 1a therein. When the waste liquid is supplied to the waste liquid tank of the ultraviolet irradiation tank 1, the waste liquid is irradiated with ultraviolet light there, and organic substances in the waste liquid are decomposed. The ultraviolet irradiation lamp 1a is a mercury lamp, and in particular, has a mercury vapor pressure of 1 × 10 ^-2 t.
orr or more, from 1 × 10 ² torr to 1 × 10 ⁴ torr
A mercury lamp in the range of r is preferable, or an ultraviolet light source such as a xenon lamp may be used.

When the waste liquid is sufficiently supplied into the processing apparatus, the waste liquid supply switching valve 4 is switched to the circulation loop side, and a batch operation for decomposing organic substances in the waste liquid is started.

The dissolved ozone concentration measuring device 13 is provided at one or a plurality of locations in a waste liquid circulation loop. The measurement result of the dissolved ozone concentration measuring device 13 is fed back to the ozone generator 5, and the control means 15 controls the supply amount of ozone gas in the ozone injection tank 2 or the ozone generator 5. In some cases, the temperature of the waste liquid rises due to heat generated from the ultraviolet light source, and the concentration of dissolved ozone decreases.

The organic substance concentration measuring device 14 is installed at one or more places in the waste liquid circulation loop. Organic substance concentration measuring instrument 14
Is fed back to the ultraviolet irradiation tank 1, the waste liquid circulation pump 3, and the ozone generator 5 to control the operation of the apparatus.

After the decomposition of the organic substance is completed, the processing liquid discharge switching valve 7 is switched to send the waste liquid to the processing liquid filtration device 9.
In the treatment liquid filtration device 9, solids containing radioactive substances such as iron clad are precisely removed. Thereafter, the waste liquid is discharged out of the system.

[0113]

As described above, according to the present invention, the generation of secondary waste is suppressed, and a large amount of high concentration is obtained by cooling or pressurizing operation in a small-scale apparatus using a high-output ultraviolet ray source and ozone. Organic-containing waste liquid can be processed quickly. In addition, during cooling, the generation of bubbles in the waste liquid is suppressed, so that the scattering of radioactive substances can be reduced, and the exposure of workers can be reduced.

[Brief description of the drawings]

FIG. 1 is a graph showing a relationship between a dissolved ozone concentration and a waste liquid treatment time.

FIG. 2 is a graph showing a relationship between a waste liquid temperature and an amount of generated bubbles.

FIG. 3 is a configuration diagram of an apparatus for treating a radioactive waste liquid according to an embodiment of the present invention.

FIG. 4 is a configuration diagram of an apparatus for treating a radioactive liquid waste according to another embodiment of the present invention.

FIG. 5 is a configuration diagram of a radioactive liquid waste treatment apparatus according to another embodiment of the present invention.

FIG. 6 is a configuration diagram of an apparatus for treating a radioactive waste liquid according to another embodiment of the present invention.

FIG. 7 is a configuration diagram of an apparatus for treating a radioactive waste liquid according to another embodiment of the present invention.

FIG. 8 is a configuration diagram of an apparatus for treating a radioactive waste liquid according to another embodiment of the present invention.

FIG. 9 is a configuration diagram of an apparatus for treating a radioactive liquid waste according to another embodiment of the present invention.

FIG. 10 is a configuration diagram of an apparatus for treating a radioactive waste liquid according to another embodiment of the present invention.

FIG. 11 is a configuration diagram of an apparatus for treating a radioactive liquid waste according to another embodiment of the present invention.

FIG. 12 is a configuration diagram of an apparatus for treating a radioactive liquid waste according to another embodiment of the present invention.

[Explanation of symbols]

l ... ultraviolet irradiation tank, 1a ... ultraviolet irradiation lamp,
2 ... Ozone injection tank, 3a, 3b ... Waste liquid circulation pump, 4 ... Waste liquid supply switching valve, 5 ... Ozone generator, 6 ... Ozone gas supply pipe, 7 ... Treatment liquid Switching valve for discharge, 8: solid matter separation device, 9: treatment liquid filtration device, 10: waste liquid pretreatment filter, 11: waste liquid cooler, 12: waste liquid pressurizer, 13. ..Dissolved ozone concentration measuring instrument, 14 ... organic substance concentration measuring instrument, 15 ...
Control means

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Satoshi Hirayama 3-1-1, Sachimachi, Hitachi-shi, Ibaraki Pref. Hitachi, Ltd. Hitachi Plant (72) Inventor Atsushi Yukita 3-1-1 Sachimachi, Hitachi-shi, Ibaraki No. 1 Inside Hitachi, Ltd. Hitachi Plant

Claims (10)

[Claims] 1. A method for dissolving ozone in a radioactive waste liquid while circulating the radioactive waste liquid in a circulation loop formed by connecting an ozone injection tank and an ultraviolet irradiation tank via a conduit, and a method for dissolving the ozone in the radioactive waste liquid. A method for treating a radioactive waste liquid, comprising irradiating ultraviolet rays onto organic matter to oxidize or decompose organic substances in the radioactive waste liquid. 2. The radioactive waste liquid according to claim 1, wherein the radioactive waste liquid is cooled to a temperature of 20 ° C. so that the temperature of the radioactive waste liquid does not decrease due to the irradiation of ultraviolet rays and the dissolved ozone concentration does not decrease.
A method for treating a radioactive waste liquid, the method comprising: 3. The radioactivity according to claim 1, wherein the pressure of the radioactive waste liquid is increased to an upper limit of 50 atm or less so that the temperature of the radioactive waste liquid does not rise due to the irradiation of ultraviolet rays and the dissolved ozone concentration does not decrease. Waste liquid treatment method. 4. The method according to claim 1, wherein the radioactive waste liquid is dissolved in the radioactive waste liquid before and / or during the treatment so that the temperature of the radioactive waste liquid does not increase due to the irradiation of ultraviolet rays and the dissolved ozone concentration does not decrease. A method for treating radioactive waste liquid, comprising measuring and controlling the ozone concentration. 5. The method according to claim 1, 2 or 3, wherein the concentration of organic substances in the radioactive waste liquid is measured during and / or after the treatment to control each device in the circulation loop and to detect the end of operation. A method for treating a radioactive waste liquid. 6. An ozone injection tank for injecting ozone into the radioactive waste liquid, an ultraviolet irradiation tank for irradiating the radioactive waste liquid containing dissolved ozone with ultraviolet light, a waste liquid circulation pump for transferring the radioactive waste liquid, and the device. A radioactive waste liquid treatment facility, wherein a circulation loop is formed with a pipe connecting the wastewater. 7. The radioactive waste liquid treatment equipment according to claim 6, further comprising a waste liquid cooler for cooling the radioactive liquid waste. 8. The radioactive waste liquid treatment equipment according to claim 6, further comprising a waste liquid pressurizer for pressurizing the radioactive waste liquid. 9. The radioactive waste liquid treatment equipment according to claim 6, further comprising a dissolved ozone concentration measuring device for measuring the dissolved ozone concentration in the radioactive waste liquid. 10. The radioactive waste liquid treatment equipment according to claim 6, further comprising an organic substance concentration measuring device for measuring an organic substance concentration in the radioactive liquid waste.