Large-volume tritium wastewater treatment device and treatment method using the same

Abstract

The present invention relates to an apparatus and method for treating a large volume of wastewater containing tritium, and more particularly to an apparatus and method for treating wastewater containing tritium, the apparatus and method including a container for storing wastewater containing tritium, an LED cable including an LED light source, a gas supply cable, and a transparent lid for sealing the container, the gas supply cable supplying air and carbon dioxide in the form of fine bubbles, the apparatus and method including the steps of: introducing wastewater containing tritium into a container of the apparatus for treating wastewater containing tritium, introducing microalgae into the container, and inducing photosynthesis using light from the LED cable under the fine bubbles supplied by the gas supply cable.

Description

[Technical field]

[0001] The present invention relates to a method and device for treating wastewater containing tritium, and more particularly to an apparatus capable of purifying tritium in water and a large volume of wastewater containing the same, and a treatment method using the same. According to the present invention, a biotechnological method and device for removing tritium from water is provided, which maximizes the removal efficiency of tritium from water by a biotechnological method that activates photosynthesis, particularly the light reaction, of microalgae. [Background technology]

[0002] In general, heavy water reactors use heavy water (D2O) as a coolant and moderator required for the operation of the reactor. During the operation of the reactor, some of the heavy water combines with neutrons to produce tritium (Tri; 3 Tritium changes into hydrogen (H or T) and generates radioactivity, the concentration of which increases depending on the number of years the power plant has been in operation. Tritium is one of the hydrogen isotopes, and is an artificial radioactive element with a mass number of 3 consisting of one proton and two neutrons. Not only is tritium the heaviest of all hydrogen isotopes, it also undergoes beta decay and is a radioactive element with a half-life of 12.3 years, which means that it can cause radioactive contamination when used in large quantities.

[0003] Tritium emits low-energy beta rays, which enter the body through the breath or skin of workers, causing internal radiation exposure. In order to reduce the effects of radiation exposure from tritium, tritium removal facilities (TRFs) are in operation at heavy water reactors. However, even tritium removal facilities are unable to completely remove tritium in the form of water vapor, and the tritium is diluted with seawater and released as heated wastewater. Therefore, when seawater is used as a source of drinking water, it is necessary to take into consideration the tritium (TRF) in the seawater. 2 O) could be a major problem.

[0004] Therefore, as in the case of the Fukushima Nuclear Power Plant in Japan, tritium wastewater is often stored in small or large temporary storage tanks, and when the situation is unfavorable, there is no suitable method for treating tritium wastewater. Meanwhile, as a technology related to an apparatus for removing tritium, Korean Patent Registration No. 2005-0006382 discloses a tritium treatment system, but the above prior art is an apparatus for removing tritium from the air, and has a problem in that it cannot remove tritium discharged into water.

[0005] That is, the reality is that there is an increasing need both domestically and internationally for a technology that can effectively treat large volumes of wastewater containing tritium present in the liquid phase. Summary of the Invention [Problem to be solved by the invention]

[0006] One aspect of the present invention is to provide an apparatus for removing tritium and wastewater containing the same, which can maximize the efficiency of removing tritium from water using a biotechnological method that activates the photosynthesis, particularly the light reaction, of microalgae, as described above.

[0007] Another aspect of the present invention is to provide a method for effectively removing tritium from water and wastewater containing tritium by maximizing the efficiency of removing tritium from water using a biotechnological method that activates photosynthesis, particularly the light reaction, of microalgae. [Means for solving the problem]

[0008] According to one aspect of the present invention, there is provided an apparatus for treating wastewater containing tritium, comprising a container for storing wastewater containing tritium, an LED cable including an LED light source, a gas supply cable, and a transparent lid for sealing the container, wherein the gas supply cable supplies air and carbon dioxide in the form of fine bubbles.

[0009] According to another aspect of the present invention, there is provided a method for treating wastewater containing tritium, comprising the steps of: introducing tritium-containing wastewater into a container of the treatment device for wastewater containing tritium of the present invention; introducing microalgae into the container; and inducing photosynthesis using light from an LED cable under fine bubbles supplied by a gas supply cable. Effect of the Invention

[0010] According to the present invention, there is provided a method and apparatus capable of treating a large amount of tritium-containing wastewater with high efficiency. The technology of the present invention not only removes tritium from water, but also significantly reduces the volume of the tritium-containing wastewater itself, and prevents the emission of tritium in the form of water vapor, thereby solving the problem of tritium contamination in the air. [Brief description of the drawings]

[0011] [Figure 1] 1 is a schematic diagram of an exemplary apparatus for treating tritium-containing wastewater of the present invention. [Diagram 2] (a) is a schematic diagram of an example of a gas supply cable, and (b) is a schematic diagram of an example of a nanoporous structure for supplying microbubbles to the end of the cable. [Diagram 3] This is a diagram showing the difference in the effects of tiny bubbles called nanobubbles (left) and regular bubbles (right). [Figure 4] 10(a) to 10(c) are schematic diagrams showing examples of the shape of the inclined protrusion on the underside of the lid, in which the underside of the lid is shown in an upside-down state. [Diagram 5] 1 is a schematic diagram of an example of a closure stopper. [Figure 6] The figure shows the tritium removal rate under various conditions, such as the ratio of LED red light to blue light and differences in microalgae. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. However, the present invention can be modified in various other forms, and the scope of the present invention is not limited to the embodiments described below.

[0013] According to the present invention, an apparatus and method capable of treating a large volume of wastewater containing tritium are provided. Figure 1 is a schematic diagram showing an example of an exemplary apparatus for treating wastewater containing tritium according to the present invention.

[0014] More specifically, the apparatus for treating wastewater containing tritium of the present invention includes a container 100 for storing wastewater containing tritium, an LED cable 20 including an LED light source, a gas supply cable 10, and a transparent lid 80 for sealing the container, and the gas supply cable supplies air and carbon dioxide in the form of fine bubbles.

[0015] The material of the cable constituting the LED cable and the gas supply cable is not particularly limited as long as it is a waterproof material, and is preferably a flexible material, and in the case of the LED cable, is preferably a transparent material through which light can pass. For example, the cable may be a tubular cable made of a ductile polymer resin, such as polyethylene, PVPF (polyvinylidene fluoride), Teflon (registered trademark), etc.

[0016] The LED cable preferably includes a combination of white, red, blue, and green light sources to provide light of various wavelengths similar to sunlight, and these light sources can be arranged in any order within a single cable, or combinations of these cables can be used, with each light source in a separate cable.

[0017] In the present invention, the ratio of light of a specific wavelength can be increased in order to activate the photosynthetic reaction of microalgae, particularly the light reaction. That is, in microalgae, photosynthesis takes place in the chloroplasts, and more specifically, the light reaction takes place in the chlorophyll on the surface of the internal thylakoid membrane, which mainly absorbs red and blue light in the visible light range (380 to 800 nm). In particular, the thylakoid membrane contains two photosystems (photochemical reaction systems) with chlorophyll a and b, which convert water into hydrogen ions (H + ), electron (e - ), and oxygen (O 2 ), but photosystem I absorbs far-red light of 700 nm, and photosystem II absorbs red light of 680 nm. Therefore, in order to activate the light reaction among the photosynthetic reactions of microalgae, it is necessary to increase the ratio of red light. Therefore, the ratio of the white light source, red light source, blue light source, and green light source is not particularly limited, but may include, for example, a ratio of white light source: red light source: blue light source: green light source of 10-20: 50-80: 20-50: 0-10. In addition, instead of setting a typical light-dark cycle (ratio) used in microalgae culture, for example, 12 hours: 12 hours a day, LED light is continuously irradiated for 24 hours a day to further strengthen the light reaction, and the decomposition and absorption of tritium and oxygen (O) by the microalgae are promoted. 2 In this way, the proportion of red LED light was increased and the LED light was irradiated continuously 24 hours a day, allowing tritium ions to be effectively concentrated inside the cells of the microalgae, specifically inside the thylakoid membrane of the chloroplasts.

[0018] The luminous intensity of the light emitted by the LED cable is 50~200μmol / m 2 If the light intensity is less than this level, the growth of the microalgae may be insufficient, and if the light intensity is more than this level, problems such as necrosis of the microalgae may occur.

[0019] Meanwhile, the gas supply cable supplies a combination of air and / or carbon dioxide in the form of fine bubbles, and the ratio of air and carbon dioxide can be adjusted as necessary, for example, carbon dioxide can be contained in a content of 0.0 to 0.5 volume percent in the total gas. If the amount of carbon dioxide exceeds that amount, the pH may drop rapidly.

[0020] In the present invention, the fine bubbles include nano-sized nanobubbles having an average particle size of 10 nm to 100 μm, for example, 10 nm to 1,000 nm, and the form of the gas supply cable that supplies them is not particularly limited as long as it can supply fine bubbles, and may be, for example, a gas supply cable 10 having a plurality of gas supply parts 11, i.e., holes, as shown in Fig. 2(a), or may have a nanoporous structure for supplying fine bubbles to the cable end as shown in Fig. 2(b). The nanoporous structure may be, for example, a porous structure manufactured from materials such as artificial stone, metal materials, and high-strength plastics, and may have pores of a size of several tens of nm or more.

[0021] As shown on the left side of Figure 3, the microbubbles of the present invention can rotate the cells at various angles while colliding with the microalgae, allowing them to constantly receive light energy from the LED light source at various angles, whereas general bubbles are unlikely to significantly change the movement of the cells, as shown on the right side of Figure 3. In other words, the circulation of water caused by strong water force is unlikely to change the movement of each cell, and instead, the strong water force applies strong pressure to the opposite side of the cells, which can distort the shape of the cells or cause stress. In addition, general bubbles can increase the buoyancy of the cells, which can induce the cells to rise and aggregate on the water surface. On the other hand, the microbubbles used in the present invention do not have strong buoyancy, which is advantageous for dispersing microalgae, and the surface of the microbubbles has a wide surface area and is negatively charged, and the cationic tritium ions ( 3 H + ) and is absorbed into the cells.

[0022] Furthermore, the microbubbles are smaller than the size of microalgae, and when they collide with the cell wall of the microalgae, they induce appropriate surface stimulation and activation to promote photosynthesis and the production of tritiated water molecules (T 2 In particular, the fine bubbles can increase the content of carbon dioxide that can be dissolved in water, which can contribute to cell growth and activation.

[0023] As a result, according to the present invention, it is possible to maximize the photosynthesis of microalgae according to the following reaction formula 1, and tritium in water is converted into glucose (C 6 H 12 O 6 ) can be highly concentrated and immobilized.

[0024] 6CO 2 +12H 2 O+Light (LED) → C 6 H 12 O 6 +6O 2 +6H 2 O [Reaction Scheme 1]

[0025] Thus, according to the present invention, by providing an abundant amount of fine bubbles, tritium ions ( 3 H + Or T + ) and tritiated water molecules (HTO) are smoothly supplied into the microalgae cells, which can contribute to the absorption of tritium into the microalgae cells.

[0026] In addition, if the ratio and intensity of the red light is further increased and light is continuously irradiated for 24 hours during the wastewater reaction, the water decomposition, hydrogen ion concentration, and oxygen generation due to the light reaction are improved as shown in Reaction Scheme 2, and the volume of the wastewater steadily decreases.

[0027] 12H 2 O+12NADP + +18ADP+Light (LED) →6O 2 +12NADPH+18ATP [Reaction 2]

[0028] In the light reaction [Reaction 2], ATP and NADPH coenzyme are further produced. As can be seen from the above reaction, 12 molecules of water are decomposed and 6 molecules of oxygen are produced in one cycle reaction, and the volume of water gradually decreases.

[0029] According to the present invention, the volume of tritium wastewater is reduced to about 1 / 3 within 10 days, facilitating the reduction of the wastewater volume and subsequent management.

[0030] In this way, the generation of microbubbles and the irradiation of a high proportion of red LED light activate the absorption and concentration of tritium by microalgae, and the O 2 This has the advantage that the generation of tritium can be promoted, and both the absorption of tritium and the reduction in the volume of wastewater can be achieved.

[0031] Meanwhile, the gas supply cable is preferably disposed at the lower end of the container in which the wastewater is stored. However, since the microbubbles provided by the gas supply cable of the present invention do not travel long distances, when the container is deep, the gas supply cable may be disposed in multiple layers in the vertical direction. In the present invention, the term "layer" refers to, for example, a vertical region or parallel lines in which the gas supply cable exists, in the case of a "gas supply cable layer". For example, the gas supply cable may be formed of multiple gas supply cable layers in the vertical direction at intervals of 50 to 100 cm based on the bottom of the container.

[0032] If the depth (height) of the container in which the wastewater is stored is not deep, the gas supply cable layers can be placed at the bottom of the container in which the wastewater is stored as shown in FIG. 1, and the gas supply cable layers can be placed at regular intervals depending on the depth (height) of the container in which the wastewater is stored.

[0033] The gas supply cable layer may form a horizontal two-dimensional network. For example, as shown in FIG. 1, the gas supply cable may be arranged in a form of multiple horizontal straight lines, or in a continuous S-shape or lattice shape connected to a single line. The arrangement of the gas supply cable is not particularly limited.

[0034] Meanwhile, the LED cable may be arranged in any form without limitation so that light reaches the entire area of ​​the container containing the wastewater, for example, as shown in FIG. 1, to form at least one layer on at least one side of the container, but is not limited thereto.

[0035] Furthermore, the apparatus for treating wastewater containing tritium according to the present invention may further include a cooler, a heater, or a combination thereof in the container in which the wastewater is stored, so as to adjust the temperature of the container and the wastewater. The cooler is further disposed on the upper end of the container in which the wastewater is stored, i.e., on the side of the device in the region in the upper part of the container where gas exists, based on the gas-liquid interface between the wastewater and the air, and when tritium is generated in the form of water vapor, it is cooled and allowed to flow back into the wastewater, thereby preventing air pollution due to tritium escaping to the outside. In this case, the cooler disposed on the upper end of the container in which the wastewater is stored may be in the form of a cooling fan. In this case, the cooler disposed on the upper end may be operated so that the air in the container is cooled to a temperature of 10°C to 15°C and the water vapor is recovered into the wastewater.

[0036] Furthermore, the lid of the present invention may be formed of a transparent material, such as glass, transparent polymer resin, etc., in which case sufficient sunlight can be supplied through the lid during the day.

[0037] Meanwhile, the underside of the lid may include one or more inclined protrusions, for example, Fig. 4 (a) to (c) show the underside of the lid turned upside down, and by forming a structure including crests and troughs in this way, it is possible to induce the evaporated tritium-containing water vapor to condense at the top of the container and fall back into the reactor by gravity. However, the shape of such an inclined protrusion is not particularly limited, and may be, for example, a structure having an inclination of 10° or more.

[0038] Additionally, an air / gas outlet 70 may be provided on the cover as needed, and a sealing plug 40 including a conical outlet tube 41 and a moisture condensation filter 42 may be provided as shown in FIG. 5 to capture tritium water molecules and induce the flow of the captured condensed water into the reaction vessel to generate a generated gas, such as oxygen (O 2 The material of these structures is not particularly limited, but it is preferable that the material has good thermal conductivity and corrosion resistance, and for example, a copper material can be used.

[0039] If necessary, a pump and / or a filtration device 60 may further be provided.

[0040] According to another aspect of the present invention, there is provided a method for treating wastewater containing tritium using the above-mentioned apparatus for treating wastewater containing tritium of the present invention.

[0041] All of the above descriptions relating to the apparatus can be applied to the apparatus for treating wastewater containing tritium according to the present invention.

[0042] In more detail, the method for treating wastewater containing tritium of the present invention includes the steps of introducing wastewater containing tritium into a container of a treatment device for wastewater containing tritium, introducing microalgae into the container, and inducing photosynthesis using light from an LED cable under fine bubbles supplied by a gas supply cable.

[0043] In the present invention, the fine bubbles have a diameter of 1.0 to 20.0 m. 3 / hr, and if the supply of fine bubbles is less than this amount, maximization of photosynthesis may not be achieved smoothly, whereas if the supply of fine bubbles is excessive, there may be a large amount of bubbles on the water surface, which may block light or cause excessive water evapotranspiration.

[0044] The microalgae applicable to the present invention may be at least one selected from Tetraselmis, Dunaliella, Chlorella, Nannochloropsis, Isochrysis, Chlamydomonas, Golenkinia, Haematococcus, Spirulina, Scenedesmus, and Chaetoceros. In this case, the microalgae may be added in an amount of 10,000 to 200,000 cells per ml of wastewater. If the amount is less than this amount, the efficiency of removing tritium may decrease, and if the amount is more than this amount, the amount of microalgae sludge and secretions may increase, decreasing cell activity and decreasing photosynthetic efficiency.

[0045] Meanwhile, the wastewater from the vessel is preferably maintained at a pH of 6-8 and a temperature of 15-25° C., under which conditions the photosynthesis of the microalgae can be maximized. The pH can be adjusted by adding an acid and / or alkali such as HCl, NaOH, etc., so that the pH is maintained in the neutral to slightly alkaline range.

[0046] The present invention will be described in more detail below with reference to specific examples. The following examples are merely illustrative to aid in understanding the present invention, and are not intended to limit the scope of the present invention. EXAMPLES

[0047] 1. Tritium and wastewater removal equipment and experiments The process of the present invention for enhancing tritium uptake and water photolysis in microalgae was applied as follows.

[0048] For wastewater purification, an apparatus including a reaction tank 100, a pump, and a filter 60 was provided as shown in FIG. 1. Room temperature wastewater containing tritium was introduced into the reaction tank, and the temperature of the wastewater was set to 20°C (±5°C) via a temperature control device installed in the reaction tank. At this time, the wastewater was prepared to contain 2,000 Bq / ml of tritium. The initial pH of the reaction tank wastewater was adjusted to 7.0 (±1.0). HCl or NaOH reagent was used to adjust the pH of the wastewater.

[0049] Microalgae were administered to the wastewater reaction tank at a concentration of approximately 100,000 cells / ml. To prevent the microalgae from clumping together, air (containing 0.1% carbon dioxide) was first blown in strongly (at 20 m 3 / hr), gradually generating uniform fine bubbles (5~10m 3 / hr) to stimulate the cell surface with tritium and facilitate its internal absorption. To prevent the cells from clumping together and settling, which would cause a rapid drop in tritium absorption, strong general bubbles (20m 3 / hr) for several minutes.

[0050] To compare the activation of light reactions in photosynthesis in microalgae, experiments were conducted using Nannochloropsis oculata (NOCC), Isochrysis galbana (ISO), Tetraselmis suecica (TS), and Chaetoceros simplex (CS) as microalgae under a combination of white light (white) and red-green-blue light (RGB) with a ratio of blue light (B) of 50% or more, and Chlorella fusca (CF) as microalgae under a combination of red light (R) of 50% or more. LED light was continuously irradiated for 24 hours each, and the photolysis of water and oxygen (O 2 During the experiment, the number of microalgae cells gradually increased, and the wastewater level gradually decreased due to water decomposition.

[0051] In order to prevent the release of tritium into the atmosphere and contamination due to evaporation of wastewater during operation, the upper cooler 30 of the reactor was operated to condense water vapor and allow it to fall downward by gravity.

[0052] The tritium concentration was measured in real time, and when it decreased to the target concentration, the reaction was stopped and the pump was operated to discharge the purified water and microalgae. At this time, the microalgae were separated and filtered through a filtration device, and only the purified water was transferred to a storage tank. Wastewater purified to below the discharge standard value was finally discharged, and the separated and filtered microalgae were finally disposed of.

[0053] Meanwhile, experiments were conducted on Nannochloropsis (NOCC) and Isochrysis (ISO) under the same conditions as above, except that a gas supply cable was used to supply regular bubbles instead of fine bubbles. In order to distinguish between microalgae when fine bubbles were supplied and those when regular bubbles were supplied, the cases where fine bubbles were applied are shown as NOCC-1 and ISO-1, and those where fine bubbles were applied are shown as NOCC-2 and ISO-2.

[0054] 2. Results of removal of tritium and wastewater containing tritium (1) Measurement of volume loss of tritium wastewater The volume reduction of wastewater was measured under the experimental conditions described in 1 above. As a result of the experiment, the overall tritium removal rate under the microbubble conditions was close to 40%, with slight differences depending on the ratio of blue and red light from the LED. In particular, the volume reduction of wastewater differed depending on the microalgae, but over 8 days, more than 1 / 5 of the water was photodecomposed and discharged as oxygen gas. In particular, in the case of CF (Chlorella), more than 1 / 3 of the wastewater was photodecomposed, with the highest volume reduction rate of the wastewater. This shows that the photodecomposition of microalgae effectively reduces the volume of wastewater, and is believed to contribute greatly to the volume reduction of high-concentration tritium wastewater.

[0055] [Table 1] *Unit: ton

[0056] (2) Measurement of tritium removal rate Meanwhile, the amount of tritium removed under the experimental conditions described in 1 above was measured, and the results are shown in the graph in FIG.

[0057] During the experiment, 4 ml of the solution was collected and microalgae were removed using a 0.45 μm syringe filter, after which 4 ml of distilled water and 12 ml of scintillation solution were mixed and the tritium concentration was analyzed using a liquid scintillation counter (LSC).

[0058] As can be seen from Figure 6, when fine bubbles were used, the overall tritium removal rate approached 40%, with slight differences depending on the ratio of LED blue and red light. In particular, CF (Chlorella) showed a tritium removal rate of over 60% over 7 days, showing that tritium was removed relatively well compared to other microalgae, indicating that tritium absorption, cellular concentration and removal are easier when the ratio of red light is high. In contrast, it was confirmed that the tritium removal rate decreased when general bubbles were used.

[0059] (3) Measurement of intracellular tritium enrichment In order to confirm whether tritium is absorbed and concentrated in the cells of the microalgae during step 1 above, the microalgae that had reacted for more than about 15 days were separated and analyzed.

[0060] Approximately 20 ml of the microalgae-containing solution was collected and centrifuged at 3,000 rpm for 20 minutes, after which the supernatant was discarded and only the microalgae were collected. A 5% hydrogen peroxide solution was mixed with distilled water to make hydrogen peroxide solution, and the microalgae that had been centrifuged earlier were added and then cooled with CO. 2 The mixture was left at room temperature for about a day to allow bubbles to continue to form. After that, the hydrogen peroxide solution after the reaction was filtered with a 0.45 μm filter syringe and the tritium concentration was analyzed by LSC.

[0061] The analysis confirmed that most microalgae had tritium trapped within their cells, with values ​​of approximately 180-380 Bq / ml (based on 15ml of hydrogen peroxide solution). In particular, the amount of tritium concentrated within the cells of CF microalgae was approximately 950 Bq / ml, confirming that it had the best tritium absorption and cellular concentration of any microalgae.

[0062] Although the embodiments of the present invention have been described in detail above, it will be obvious to those skilled in the art that various modifications and variations are possible without departing from the scope of the claims. [Explanation of symbols]

[0063] 10: Gas supply cable 11: Gas supply section (bubble generation point) 20: LED cable 30:Cooler 30': Cooler (cooler) 40: Sealing plug (air and / or gas outlet) 41: Cone-shaped outlet pipe (copper material) 42: Moisture condensation filter (nano-porous copper metal material) 50: Heater 60: Pumps and filtration equipment 70: Air / gas outlet 80: Lid 100: Container (reaction tank)

Claims

1. A container for storing wastewater containing tritium; an LED cable including an LED light source; A gas supply cable; a transparent lid for sealing the container; The gas supply cable supplies air and carbon dioxide in the form of fine bubbles, in a treatment device for wastewater containing tritium.

2. 2. The apparatus for treating wastewater containing tritium as described in claim 1, wherein the LED cable includes a white light source, a red light source, a blue light source, and a green light source in one cable or a combination of cables including each light source in a separate cable.

3. 2. The apparatus for treating wastewater containing tritium according to claim 1, wherein the fine bubbles include bubbles having an average particle size of 10 nm to 100 μm.

4. 2. The apparatus for treating wastewater containing tritium according to claim 1, wherein the gas supply cable is formed in a plurality of layers of gas supply cables in a vertical direction at intervals of 50 to 100 cm from the bottom of the container.

5. The apparatus for treating wastewater containing tritium according to claim 4 , wherein the gas supply cable layer forms a horizontal two-dimensional network.

6. The apparatus for treating wastewater containing tritium according to claim 1 , further comprising a cooler, a heater, or a combination thereof in the vessel in which the wastewater is contained.

7. The apparatus for treating tritium-containing wastewater according to claim 1 , further comprising a cooler in an upper gas-existing region in said vessel.

8. The apparatus for treating tritium-containing wastewater as claimed in claim 1 , wherein the lower surface of the lid includes one or more sloping protrusions.

9. A step of introducing wastewater containing tritium into a container of a treatment device for wastewater containing tritium according to any one of claims 1 to 8; Putting microalgae into the container; inducing photosynthesis using light from an LED cable under fine bubbles supplied by a gas supply cable; A method for treating wastewater containing tritium, comprising:

10. The fine bubbles are 1.0 to 20.0 m ３ 10. The method for treating wastewater containing tritium according to claim 9, wherein the tritium-containing wastewater is supplied in an amount of 1000 mg / hr.

11. 10. The method for treating wastewater containing tritium according to claim 9, wherein the microalgae is at least one selected from the group consisting of Tetraselmis, Dunaliella, Chlorella, Nannochloropsis, Isochrysis, Chlamydomonas, Golenkinia, Haematococcus, Spirulina, Scenedesmus, and Chaetoceros.

12. 10. The method for treating wastewater containing tritium according to claim 9, wherein the wastewater in the vessel is maintained at a pH of 6 to 8 and a temperature of 15 to 25°C.

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