Wastewater purification apparatus using plasma and wastewater purification method using plasma

Abstract

One embodiment of the present invention discloses a wastewater purification apparatus using plasma, the apparatus comprising: a first electrode; a second electrode facing the first electrode and spaced apart from the first electrode; a dielectric layer positioned between the first electrode and the second electrode; a wastewater supply pipe for supplying wastewater containing organic matter to the second electrode; and a power supply unit connected to the first electrode and the second electrode so as to apply a voltage thereto, and forming a discharge between the first electrode and the second electrode, wherein the wastewater forms a water layer on the upper portion of the second electrode, and the organic matter is decomposed by plasma generated due to the discharge.

Description

Wastewater purification device using plasma and wastewater purification method using plasma

[0001] The present invention relates to a wastewater purification device using plasma that removes high molecular organic matter contained in wastewater using plasma, and a wastewater purification method using plasma.

[0002] When wastewater from industrial wastewater, business wastewater, or other sources contains high-molecular organic compounds, they must be removed before discharge. Conventionally, microbial treatment has been used to remove these organic compounds.

[0003] However, despite the advantages of purification methods using microorganisms, such as fewer secondary pollution problems and less methane gas generation compared to other physical and chemical treatments, their use is limited due to disadvantages such as long treatment times and the generation of foul odors.

[0004] U.S. Patent No. 3,998,198 discloses a method of placing wastewater containing hemicellulose in a high-pressure reactor at a pressure of 20 to 25 psi and heating it at 140 to 200°C for 15 to 60 minutes. However, this method uses a high-pressure reactor to thermally decompose polymer components, and since it uses a high-pressure reactor with a limited capacity, the treatment capacity is limited, resulting in a low treatment capacity per unit time, making it an unsuitable method for treating large amounts of wastewater. In addition, it has the disadvantage of being a batch method that cannot be treated continuously.

[0005] The present invention provides a wastewater purification device using plasma capable of efficiently treating wastewater containing polymer organic matter using plasma, and a wastewater purification method using plasma.

[0006] A wastewater purification device according to one embodiment of the present invention comprises: a first electrode; a second electrode facing the first electrode and spaced apart from the first electrode; a dielectric layer positioned between the first electrode and the second electrode; a wastewater supply pipe supplying wastewater containing organic matter to the second electrode; and a power supply unit connected to the first electrode and the second electrode to apply voltage and form a discharge between the first electrode and the second electrode; wherein the wastewater forms a water film on the upper portion of the second electrode and the organic matter can be decomposed by plasma generated by the discharge.

[0007] A wastewater purification method according to another embodiment of the present invention may include a water film formation step of supplying wastewater to a second electrode while the first electrode and the second electrode are arranged to face each other to form a water film on top of the second electrode, a discharge step of forming a discharge by forming a voltage difference between the first electrode and the second electrode, and an organic matter decomposition step of decomposing organic matters contained in the wastewater with plasma formed by the discharge.

[0008] A plasma water treatment device according to one embodiment of the present invention forms a water film, forms a dielectric discharge in the water film, and uses plasma to generate chemical species capable of oxidizing organic substances such as hydroxide ions (OH), oxygen ions, and ozone, and can efficiently decompose high molecular weight organic substances.

[0009] FIG. 1 is a drawing illustrating a wastewater purification device according to a first embodiment of the present invention.

[0010] Figure 2 is a perspective view illustrating a second electrode according to the first embodiment of the present invention.

[0011] Figure 3 is a flowchart for explaining a wastewater purification method according to the first embodiment of the present invention.

[0012] FIG. 4 is a drawing illustrating a wastewater purification device according to a second embodiment of the present invention.

[0013] Figure 5 is a flowchart for explaining a wastewater purification method according to a second embodiment of the present invention.

[0014] FIG. 6 is a drawing illustrating a plasma water treatment device according to a third embodiment of the present invention.

[0015] One embodiment of the present invention discloses a wastewater purification device using plasma, comprising: a first electrode; a second electrode facing the first electrode and spaced apart from the first electrode; a dielectric layer positioned between the first electrode and the second electrode; a wastewater supply pipe supplying wastewater containing organic matter to the second electrode; and a power supply unit connected to the first electrode and the second electrode to apply voltage and form a discharge between the first electrode and the second electrode; wherein the wastewater forms a water film on the upper portion of the second electrode, and the organic matter is decomposed by plasma generated by the discharge.

[0016] In this embodiment, the second electrode may be formed of a metal mesh or a porous plate.

[0017] In this embodiment, a lower cover covering the bottom surface and side surface of the second electrode may be further included.

[0018] In this embodiment, a recirculation pipe for supplying wastewater discharged from the second electrode back to the second electrode and a recirculation pump connected to the recirculation pipe may be further included.

[0019] In this embodiment, an ozone supply unit for supplying ozone to wastewater discharged from the second electrode may be further included.

[0020] In this embodiment, a drain hole may be formed in the second electrode.

[0021] In this embodiment, hydrogen peroxide solution can be supplied to the wastewater.

[0022] In the present embodiment, the wastewater may further include a secondary treatment unit for additionally removing organic matter from the effluent in which the organic matter has been decomposed.

[0023] In this embodiment, the secondary treatment unit may be composed of a biofilter or a microbial treatment device.

[0024] In this embodiment, an adsorption removal unit for adsorbing contaminants may be further installed at the rear of the secondary treatment unit.

[0025] In this embodiment, a gas treatment unit may further be included to remove organic matter from the exhaust gas generated when the organic matter is decomposed.

[0026] In the present embodiment, the meteorological treatment unit may include at least one of a filter, activated carbon, or a catalyst that adsorbs and removes the organic matter from the exhaust gas.

[0027] Another embodiment of the present invention discloses a wastewater purification method using plasma, characterized by including a water film formation step of supplying wastewater to a second electrode while the first electrode and the second electrode are arranged to face each other to form a water film on the upper portion of the second electrode; a discharge step of forming a voltage difference between the first electrode and the second electrode to form a discharge; and an organic matter decomposition step of decomposing organic matters contained in the wastewater with plasma formed by the discharge.

[0028] In the present embodiment, a recirculation step of resupplying the discharged water from the second electrode to the second electrode may be further included.

[0029] In this embodiment, ozone can be supplied to at least one of the wastewater and the effluent.

[0030] In the present embodiment, the film forming step may add hydrogen peroxide to the wastewater supplied to the second electrode.

[0031] In the present embodiment, the discharge step can form a dielectric discharge by installing a dielectric layer on the second electrode.

[0032] In the present embodiment, a secondary treatment step for removing organic matter from the material generated in the organic matter decomposition step may be further included.

[0033] In the present embodiment, the secondary treatment step may further include a gas phase adsorption step for adsorbing organic matter contained in the exhaust gas generated in the organic matter decomposition step.

[0034] In the present embodiment, the secondary treatment step may further include a post-decomposition step for decomposing low-molecular organic matter contained in wastewater decomposed in the organic matter decomposition step, and a liquid adsorption step for adsorbing pollutants contained in wastewater discharged in the post-decomposition step.

[0035] The present invention is susceptible to various modifications and embodiments. Specific embodiments are illustrated and described in detail in the detailed description. However, this is not intended to limit the present invention to specific embodiments, but rather to encompass all modifications, equivalents, and alternatives falling within the spirit and technical scope of the present invention.

[0036] The terminology used herein is merely used to describe specific embodiments and is not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly indicates otherwise. In the present invention, it should be understood that the terms "comprise" or "have" are intended to specify the presence of a feature, number, step, operation, component, part, or combination thereof described in the specification, but do not exclude in advance the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0037] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. Please note that, where possible, identical components are represented by identical reference numerals throughout the drawings. Furthermore, detailed descriptions of well-known functions and configurations that may obscure the gist of the present invention will be omitted. For the same reason, some components in the attached drawings are exaggerated, omitted, or schematically depicted.

[0038] Below, a wastewater purification device according to the first embodiment of the present invention is described.

[0039] FIG. 1 is a drawing illustrating a wastewater purification device according to a first embodiment of the present invention, and FIG. 2 is a perspective view illustrating a second electrode according to the first embodiment of the present invention.

[0040] Referring to FIGS. 1 and 2, a wastewater purification device (100) according to the present embodiment may include a plasma water treatment device (10), a gas treatment unit (20), a secondary treatment unit (30), and a hydrogen peroxide supply unit (60). The wastewater purification device (100) may be a system that decomposes and removes organic matter from wastewater containing polymer organic matter.

[0041] A plasma water treatment device (10) is a device that uses plasma to decompose high molecular organic matter contained in wastewater, and generates plasma using dielectric discharge. The plasma water treatment device (10) may include a first electrode (11), a second electrode (12), a dielectric layer (13), a wastewater supply pipe (14), a power supply unit (17), and a housing (15).

[0042] The housing (15) is formed in a box shape, and a first electrode (11), a second electrode (12), a dielectric layer (13), and a wastewater supply pipe (14) can be located inside the housing (15). The power supply unit (17) can be located inside or outside the housing (15).

[0043] The first electrode (11) is formed in a plate shape and can be charged or grounded with a discharge voltage. The second electrode (12) faces the first electrode (11) and is disposed spaced downward from the first electrode (11). The first electrode (11) and the second electrode (12) may be formed of metal, and in particular, the second electrode (12) may be formed in the form of a metal mesh body or a porous plate that supplies wastewater so as to form a uniform water film (WF) on the second electrode (12). A plurality of holes may be formed in the second electrode (12) formed of the metal mesh body or the porous plate. The second electrode (12) may be formed in a circular plate, but the present invention is not limited thereto.

[0044] The second electrode (12) can be charged with a discharge voltage or grounded. The power supply (17) is connected to the first electrode (11) and the second electrode (12), and charges the first electrode (11) or the second electrode (12) with a discharge voltage. In this embodiment, the first electrode (11) is charged with a discharge voltage, and the second electrode (12) is grounded, as an example.

[0045] The dielectric layer (13) is formed in a plate shape and is placed between the first electrode (11) and the second electrode (12). The dielectric layer (13) can be attached to the lower surface of the first electrode (11). The dielectric layer (13) can include silicon, ceramic, glass, alumina, etc., and the present invention is not limited to the material of the dielectric layer. The dielectric layer (13) can charge and discharge electric charges.

[0046] The wastewater supply pipe (14) is connected to the lower part of the second electrode (12) and supplies wastewater to the second electrode (12), and the wastewater supply pipe (14) can be connected to a storage tank (50) in which wastewater is stored via a transfer pipe (51).

[0047] The hydrogen peroxide supply unit (60) supplies hydrogen peroxide to the wastewater supplied to the plasma water treatment device. The hydrogen peroxide supply unit (60) includes a hydrogen peroxide storage unit (61) for storing hydrogen peroxide and a hydrogen peroxide supply pipe (62) for transporting hydrogen peroxide. The hydrogen peroxide supply pipe (62) is connected to a storage tank (50) and can supply hydrogen peroxide to the storage tank (50) in which wastewater is stored. However, the present invention is not limited thereto, and the hydrogen peroxide supply pipe (62) may be connected to a wastewater supply pipe (14). When hydrogen peroxide is added to wastewater, the decomposition efficiency of pollutants can be significantly increased.

[0048] Additionally, the wastewater supply pipe (14) can be connected to the center of the second electrode (12). The wastewater supplied to the second electrode (12) forms a water film (WF) on the upper surface of the second electrode (12), moves to the outside of the second electrode (12), and then falls from the side of the second electrode (12) to the bottom of the housing (15).

[0049] When a discharge voltage is applied to the first electrode (11), the second electrode (12) is grounded, and wastewater is supplied to the second electrode (12), a dielectric discharge occurs between the first electrode (11) and the second electrode (12), and plasma is generated by the dielectric discharge. In addition, highly active chemical species such as hydroxide ions, oxygen ions, and ozone are generated by the dielectric discharge and plasma, and high molecular weight organic substances contained in the wastewater can be decomposed into low molecular weight organic substances by these chemical species.

[0050] The side and bottom surfaces of the second electrode (12) may be formed in a closed structure so that a water film (WF) can be formed on the upper surface of the second electrode (12). Accordingly, wastewater supplied through the wastewater supply pipe (14) can be discharged to the bottom of the housing through the upper surface by moving only to the upper surface of the second electrode (12).

[0051] In the process of decomposing wastewater, an exhaust gas containing organic matter is generated. The exhaust gas generated inside the housing (15) is discharged through a gas discharge pipe (21), and a gas treatment unit (20) is installed in the gas discharge pipe (21). The gas treatment unit (20) may include at least one of a filter, activated carbon, or a catalyst, and removes organic matter contained in the exhaust gas by adsorbing it.

[0052] A discharge line (31) through which decomposed wastewater is discharged is connected to the housing (15), and a secondary treatment unit (30) for decomposing organic matter contained in the wastewater may be installed in the discharge line (31). The secondary treatment unit (30) decomposes low-molecular organic matter contained in the wastewater and may be composed of a microbial treatment device, a biofilter, etc. The biofilter includes a filler material and microorganisms, and the filler material may include a porous membrane, wood, a coagulant, etc. The microorganisms can proliferate in the filler material and decompose organic matter.

[0053] In addition, an adsorption removal unit (32) that adsorbs pollutants is installed at the rear (downstream) of the secondary treatment unit, and the adsorption removal unit (32) adsorbs pollutants contained in the discharged water, including activated carbon, a filter, etc.

[0054] As described above, according to the present embodiment, a water film (WF) is formed on the upper surface of the second electrode (12) made of a metal mesh, so that high molecular organic substances contained in wastewater can be easily decomposed. In addition, organic substances and low molecular organic substances contained in exhaust gas can be stably removed by including a gas treatment unit (20) and a secondary treatment unit (30). In the past, organic substances were decomposed using only a biofilter, so there was a problem that a lot of time was consumed in the process of decomposing the organic substances. However, according to the present embodiment, high molecular organic substances are decomposed into low molecular organic substances using a dielectric discharge and plasma, and then the low molecular organic substances are decomposed using a biofilter, so the time for treating wastewater can be significantly shortened compared to the past.

[0055] Hereinafter, a wastewater purification method according to the first embodiment of the present invention will be described.

[0056] Figure 3 is a flowchart for explaining a wastewater purification method according to the first embodiment of the present invention.

[0057] Referring to FIG. 3, the wastewater purification method according to the first embodiment may include a water film formation step (S101), a discharge step (S102), an organic matter decomposition step (S103), and a secondary treatment step (S104).

[0058] In the water film formation step (S101), wastewater is supplied to the second electrode (12) while the first electrode (11) and the second electrode (12) are arranged to face each other, thereby forming a water film (WF) on the upper portion of the second electrode (12).

[0059] The water film formation step (S101) supplies wastewater to a second electrode (12) made of a metal mesh or porous body, supplies wastewater to the center of the second electrode (12), and allows the wastewater to move upward through holes formed in the second electrode (12). In addition, the wastewater that has moved to the upper part of the second electrode (12) can move along the upper surface of the second electrode (12) to the outer end of the second electrode (12) and fall while forming a water film.

[0060] The film formation step (S101) can add hydrogen peroxide to the wastewater supplied to the second electrode (12) so that the wastewater with hydrogen peroxide added can be supplied to the second electrode (12).

[0061] In the discharge step (S102), a discharge voltage is applied to the first electrode (11) while the dielectric layer (13) is attached to the first electrode (11) and the second electrode (12) is grounded to form a dielectric discharge. In the discharge step (S102), a charge is charged in the dielectric layer attached to the lower portion of the first electrode (11) charged with the discharge voltage to form a dielectric discharge. The dielectric discharge occurs between the dried dielectric layer (13) and the second electrode (12) containing water, and can be formed in the form of a uniform glow discharge or a streamer discharge in which multiple streamers are generated with a time difference, depending on the applied voltage conditions.

[0062] Plasma is formed by dielectric discharge, and the organic matter decomposition step (S103) decomposes high-molecular organic matters contained in wastewater into low-molecular organic matters using dielectric discharge and plasma. The secondary treatment step (S104) removes organic matters from the materials discharged in the organic matter decomposition step (S103). The secondary treatment step (S104) may include a gas phase adsorption step for treating the exhaust gas generated in the organic matter decomposition step (S103), a post-decomposition step for decomposing low-molecular organic matters contained in the wastewater, and a liquid phase adsorption step for adsorbing pollutants contained in the wastewater discharged in the post-decomposition step.

[0063] The gaseous adsorption step removes organic substances contained in the exhaust gas by adsorbing them using a gaseous treatment unit (20) while discharging the exhaust gas generated inside the housing (15). The gaseous treatment unit (20) may include a filter, activated carbon, a catalyst, etc.

[0064] The post-decomposition step decomposes low-molecular organic matter contained in the effluent using a secondary treatment unit (30) while discharging the decomposed effluent from the housing (15). The post-decomposition step can decompose organic matter using a secondary treatment unit consisting of a microbial decomposition device and a biofilter.

[0065] The liquid adsorption stage removes pollutants contained in the effluent discharged from the post-decomposition stage by adsorbing them using activated carbon, filters, etc.

[0066] Below, a wastewater purification device according to a second embodiment of the present invention is described.

[0067] FIG. 4 is a drawing illustrating a wastewater purification device according to a second embodiment of the present invention.

[0068] Referring to FIG. 4, the wastewater purification device (100) according to the present embodiment has the same structure as the wastewater purification device according to the first embodiment described above, except for the lower cover (19), hydrogen peroxide supply unit (60), overflow container (71), recirculation pipe (72), recirculation pump (73), and ozone supply unit (80).

[0069] The hydrogen peroxide supply unit (60) supplies hydrogen peroxide to the wastewater supplied to the plasma water treatment device. The hydrogen peroxide supply unit (60) includes a hydrogen peroxide storage unit (61) for storing hydrogen peroxide and a hydrogen peroxide supply pipe (62) for transporting hydrogen peroxide. The hydrogen peroxide supply pipe (62) is connected to a transport pipe (51) so as to supply hydrogen peroxide to the transport pipe (51).

[0070] In addition, the plasma water treatment device (10) may include a first electrode (11), a second electrode (12), a dielectric layer (13), a wastewater supply pipe (14), a power supply unit (17), a housing (15), a lower cover (19), an overflow container (71), a recirculation pipe (72), and a recirculation pump (73).

[0071] The lower cover (19) is connected to the lower portion of the second electrode (12) and is installed to cover the bottom surface and side surfaces of the second electrode (12). Accordingly, wastewater supplied to the second electrode (12) can form a water film on the upper surface of the second electrode (12) without flowing out to the bottom surface and side surfaces of the second electrode (12).

[0072] Meanwhile, an overflow container (71) is installed at the bottom of the second electrode (12), and the wastewater discharged from the second electrode (12) is accommodated in the overflow container (71). When the overflow container (71) overflows, the wastewater can move to the bottom of the housing (15). A recirculation pipe (72) and a discharge line (31) can be connected to the overflow container (71), and the recirculation pipe (72) supplies the wastewater accommodated in the overflow container (71) to the second electrode (12). A recirculation pump (73) for transporting the wastewater can be installed in the recirculation pipe (72). However, the present invention is not limited thereto, and when the wastewater discharged from the second electrode (12) is accommodated in the housing (15), the recirculation pipe (72) can be connected to the bottom of the housing (15).

[0073] The recirculation pipe (72) is connected to the wastewater supply pipe (14) and delivers wastewater to the wastewater supply pipe (14). High molecular organic matter that is not decomposed in the water film (WF) can be decomposed again during the recirculation process.

[0074] Meanwhile, the discharge line (31) is connected to the overflow container (71) and the housing (15) to discharge wastewater.

[0075] The ozone supply unit (80) supplies ozone to the wastewater discharged from the second electrode (12), and may include an ozone storage unit (81) and an ozone supply pipe (82). The ozone supply pipe (82) is connected to an overflow container (71) so that ozone can be supplied to the wastewater, and the oxidation treatment performance of the wastewater can be improved by supplying ozone.

[0076] As another example, the ozone may be supplied to wastewater supplied to the second electrode (12) to improve the oxidation treatment performance of the wastewater. To this end, the ozone supply unit (80) may be connected to the wastewater supply pipe (14). That is, ozone may be supplied to at least one of the wastewater and the effluent.

[0077] Below, a wastewater purification method according to a second embodiment of the present invention is described.

[0078] Figure 5 is a flowchart for explaining a wastewater purification method according to a second embodiment of the present invention.

[0079] Referring to FIG. 5, the wastewater purification method according to the second embodiment may include a water film formation step (S201), a discharge step (S202), an organic matter decomposition step (S203), a recirculation step (S204), and a secondary treatment step (S205).

[0080] The wastewater purification method according to the second embodiment is composed of the same process as the wastewater purification method according to the first embodiment described above, except for the recirculation step (S204), so a duplicate description is omitted.

[0081] The recirculation step (S204) supplies wastewater contained in an overflow container (71) disposed below the second electrode (12) to the second electrode (12) through a recirculation pipe (72) and a wastewater supply pipe (14). The recirculation step (S204) supplies wastewater containing undecomposed high molecular weight organic matter to the second electrode (12) so that it can be decomposed again. In addition, the recirculation step (S204) may also supply wastewater contained in the lower portion of the housing (15) to the second electrode.

[0082] The recirculation step (S204) recirculates ozone by supplying it to the wastewater discharged from the second electrode (12) using the ozone supply unit (80).

[0083] Meanwhile, the secondary treatment step (S205) may include a gas phase adsorption step for treating the exhaust gas decomposed in the recirculation step (S204), a post-decomposition step for treating the exhaust water containing low molecular weight organic matter decomposed in the recirculation step (S204), and a liquid phase adsorption step for adsorbing pollutants contained in the exhaust water discharged in the post-decomposition step.

[0084] Below, a plasma water treatment device according to a third embodiment of the present invention is described.

[0085] FIG. 6 is a drawing illustrating a plasma water treatment device according to a third embodiment of the present invention.

[0086] Referring to FIG. 6, the plasma water treatment device (10) according to the present embodiment has the same structure as the wastewater purification device according to the first embodiment described above, except for a plurality of wastewater supply pipes (14) and a second electrode (12).

[0087] A plurality of wastewater supply pipes (14) are connected to the second electrode (12), and wastewater can be supplied to the second electrode (12) simultaneously through the plurality of wastewater supply pipes (14).

[0088] A plurality of drainage holes (18) can be formed between the part connected to the wastewater supply pipe (14) in the second electrode (12), and the wastewater decomposed in the second electrode (12) can fall to the bottom of the housing (15) through the drainage holes (18).

[0089] Accordingly, the size of the second electrode (12) and the amount of wastewater treated can be increased.

[0090] Above, one embodiment of the present invention has been described, but a person having ordinary skill in the art will be able to modify and change the present invention in various ways by adding, changing, deleting or adding components, etc., within the scope that does not depart from the spirit of the present invention described in the claims, and this will also be considered to be included within the scope of the rights of the present invention.

Claims

1. First electrode; A second electrode facing the first electrode and spaced apart from the first electrode; A dielectric layer positioned between the first electrode and the second electrode; A wastewater supply pipe supplying wastewater containing organic matter to the second electrode; and A power supply unit connected to the first electrode and the second electrode to apply voltage and form a discharge between the first electrode and the second electrode; The above wastewater forms a water film on top of the second electrode, A wastewater purification device using plasma that decomposes organic matter by plasma generated by the above discharge.

2. In paragraph 1, The above second electrode is a wastewater purification device using plasma made of a metal mesh or a porous plate.

3. In paragraph 2, A wastewater purification device using plasma further comprising a lower cover covering the bottom surface and side surfaces of the second electrode.

4. In paragraph 3, A wastewater purification device using plasma, further comprising a recirculation pipe that supplies wastewater discharged from the second electrode back to the second electrode, and a recirculation pump connected to the recirculation pipe.

5. In paragraph 4, A wastewater purification device using plasma further comprising an ozone supply unit that supplies ozone to wastewater discharged from the second electrode.

6. In paragraph 1, A wastewater purification device using plasma in which a drainage hole is formed in the second electrode.

7. In paragraph 1, A wastewater purification device using plasma that supplies hydrogen peroxide to the above wastewater.

8. In paragraph 1, A wastewater purification device using plasma further comprising a secondary treatment unit for additionally removing organic matter from the wastewater in which the organic matter has been decomposed.

9. In paragraph 8, The above secondary treatment unit is a wastewater purification device using plasma consisting of a biofilter or a microbial treatment device.

10. In paragraph 9, A wastewater purification device using plasma, in which an adsorption removal unit for adsorbing pollutants is further installed at the rear of the secondary treatment unit.

11. In paragraph 1, A wastewater purification device using plasma, further comprising a gas treatment unit for removing organic matter from the exhaust gas generated during the decomposition of the organic matter.

12. In paragraph 11, The above-mentioned weather treatment unit is a wastewater purification device using plasma including at least one of a filter, activated carbon, or catalyst that adsorbs and removes the organic matter from the exhaust gas.

13. A water film formation step in which wastewater is supplied to the second electrode while the first electrode and the second electrode are positioned so as to face each other, thereby forming a water film on the upper portion of the second electrode; A discharge step for forming a discharge by forming a voltage difference between the first electrode and the second electrode; and An organic matter decomposition step for decomposing organic matter contained in wastewater using plasma formed by the above discharge; A method for purifying wastewater using plasma including:

14. In paragraph 13, A wastewater purification method using plasma further comprising a recirculation step of resupplying the discharged water from the second electrode to the second electrode.

15. In paragraph 14, A wastewater purification method using plasma that supplies ozone to at least one of the above wastewater and the above effluent.

16. In paragraph 13, The above film formation step is a wastewater purification method using plasma that adds hydrogen peroxide to wastewater supplied to the second electrode.

17. In paragraph 13, A wastewater purification method using plasma in which the above discharge step forms a dielectric discharge by installing a dielectric layer on the second electrode.

18. In paragraph 13, A wastewater purification method using plasma, further comprising a secondary treatment step of removing organic matter from the material generated in the organic matter decomposition step.

19. In paragraph 18, A method for purifying wastewater using plasma, wherein the secondary treatment step includes a gas phase adsorption step for adsorbing organic matter contained in the exhaust gas generated in the organic matter decomposition step.

20. In paragraph 18, A method for purifying wastewater using plasma, wherein the secondary treatment step further comprises a post-decomposition step for decomposing low-molecular organic matter contained in wastewater decomposed in the organic matter decomposition step, and a liquid adsorption step for adsorbing pollutants contained in wastewater discharged in the post-decomposition step.

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