JP2017196593A - Apparatus for treating volatile organic compound-containing water, and method for treating - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus for treating volatile organic compound-containing water capable of performing gas-liquid separation treatment together with oxidative decomposition treatment of volatile organic compounds from volatile organic compound-containing water, and a method for treating.SOLUTION: The apparatus 1 for treating volatile organic compound-containing water includes: a reaction vessel 10 having a gas-liquid contact part for contacting volatile organic compound-containing water containing volatile organic compounds with gas, and a light emitter-filled part 44 filled with a granular light emitter emitting ultraviolet light by microwave; and a microwave-generating device 12, where gas-liquid separation treatment for transferring the volatile organic compounds to the gas from the volatile organic compound-containing water and oxidative decomposition treatment of the volatile organic compounds are performed together by passing the volatile organic compound-containing water through the gas-liquid contact part while irradiating the granular emitter with microwave generated by the microwave-generating device 12.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a treatment apparatus and treatment method for volatile organic compound-containing water containing a volatile organic compound.

  For example, when treating volatile organic compound-containing water such as groundwater containing organic chlorinated compounds such as trichlorethylene and tetrachloroethylene which are volatile organic compounds (VOC), aeration, volatile organic compound-containing water and gas such as air Gas-liquid separation treatment by aeration, etc. that moves volatile organic compounds contained in volatile organic compound-containing water to gas by contacting them, accelerated oxidation treatment by combining ozone, ultraviolet rays, hydrogen peroxide, etc., or oxidation by living organisms Processing is performed. In particular, in water purification treatment, gas-liquid separation treatment by aeration is often employed (see, for example, Non-Patent Document 1).

  In aeration in water purification treatment, organochlorine compounds such as trichlorethylene can be recovered by gas-liquid separation, but since it is not detoxifying treatment, it is necessary to store waste liquid after collection. Further, detoxification treatment such as accelerated oxidation treatment or oxidation treatment requires a great deal of energy.

  On the other hand, a microwave ultraviolet light emitting device is known as one of ultraviolet irradiation devices. For example, there is one that emits ultraviolet light by irradiating a granular electrodeless ultraviolet light emitter with a microwave of 2.45 GHz or the like from the outside (see, for example, Patent Document 1 and Non-Patent Document 2).

Japanese Patent No. 5049004

Japan Water Works Association, Waterworks Design Guidelines 2012, pp. 291-293 Satoshi Horikoshi, “Study on the development of contaminated water purification equipment for disaster-stricken areas using electrodeless lamps with photocatalyst coating”, March 2014, FY2013 Subsidy for Environmental Research Promotion Fund Research Project Research Report

  The objective of this invention is providing the processing apparatus and processing method of volatile organic compound containing water which can perform an oxidative decomposition process with the gas-liquid separation process of the volatile organic compound from volatile organic compound containing water. It is in.

  The present invention includes a gas-liquid contact portion for bringing a volatile organic compound-containing water containing a volatile organic compound into contact with a gas, and a light emitter filling portion filled with a granular light emitter that emits ultraviolet light by a microwave. A tank; and a microwave generating means, and irradiating the granular illuminant with the microwave generated by the microwave generating means, and allowing the water containing the volatile organic compound to pass through the gas-liquid contact portion. The volatile organic compound-containing water treatment apparatus performs oxidative decomposition treatment of the volatile organic compound together with gas-liquid separation treatment for transferring the volatile organic compound from the volatile organic compound-containing water to the gas.

  In the volatile organic compound-containing water treatment apparatus, it is preferable that the light emitter filling portion is provided in the gas-liquid contact portion.

  In the volatile organic compound-containing water treatment apparatus, the light emitter filling portion is provided upstream of the gas-liquid contact portion, and a filler that is not an ultraviolet light emitter is filled downstream of the light emitter filling portion. It is preferable that a filler part is provided.

  In the volatile organic compound-containing water treatment apparatus, it is preferable that the light emitter filling portion is provided on the downstream side of the gas-liquid contact portion.

  In the volatile organic compound-containing water treatment apparatus, it is preferable that the light emitter filling portion is provided in a gas discharge portion at an upper portion of the reaction tank.

  In addition, the present invention provides a gas-liquid contact portion for bringing a volatile organic compound-containing water containing a volatile organic compound into contact with a gas, and a granular light emission that emits ultraviolet light by the microwave. The volatile organic compound-containing water is passed through the gas-liquid contact portion while irradiating the granular illuminant in a reaction vessel having a body-filled phosphor-filled portion, and containing the volatile organic compound. A method for treating volatile organic compound-containing water, wherein the volatile organic compound is oxidatively decomposed together with a gas-liquid separation treatment for transferring the volatile organic compound from water to the gas.

  In the method for treating volatile organic compound-containing water, it is preferable that the light emitter filling portion is provided in the gas-liquid contact portion.

  In the method for treating volatile organic compound-containing water, the light emitter filling portion is provided upstream of the gas-liquid contact portion, and a filler that is not an ultraviolet light emitter is filled downstream of the light emitter filling portion. It is preferable that a filler part is provided.

  In the method for treating volatile organic compound-containing water, it is preferable that the light emitter filling portion is provided on the downstream side of the gas-liquid contact portion.

  In the method for treating volatile organic compound-containing water, it is preferable that the light emitter filling portion is provided in a gas discharge portion at an upper portion of the reaction tank.

  According to the present invention, a volatile organic compound-containing water treatment apparatus and treatment method capable of performing oxidative decomposition treatment together with gas-liquid separation treatment of volatile organic compounds from volatile organic compound-containing water are provided. Can do.

It is a schematic block diagram which shows an example of the processing apparatus of volatile organic compound containing water which concerns on embodiment of this invention. It is a schematic block diagram which shows the other example of the processing apparatus of volatile organic compound containing water which concerns on embodiment of this invention. It is a schematic block diagram which shows the other example of the processing apparatus of volatile organic compound containing water which concerns on embodiment of this invention. 2 is a schematic configuration diagram showing a treatment apparatus for volatile organic compound-containing water used in Comparative Example 1. FIG. It is a schematic block diagram which shows the processing apparatus of the volatile organic compound containing water used in the comparative example 2.

  Embodiments of the present invention will be described below. This embodiment is an example for carrying out the present invention, and the present invention is not limited to this embodiment.

<Filling tower type processing equipment>
The outline of an example of the processing apparatus of the volatile organic compound containing water which concerns on embodiment of this invention is shown in FIG. 1, and the structure is demonstrated. The volatile organic compound-containing water treatment apparatus 1 is an apparatus based on a gas-liquid separation treatment apparatus called a so-called packed tower type aeration apparatus. The volatile organic compound-containing water treatment apparatus 1 includes a reaction vessel 10 having a light emitter filling portion 44 filled with a granular light emitter that emits ultraviolet light by a microwave, and a microwave generator 12 as a microwave generating means. Prepare. The treatment apparatus 1 may include a gas treatment tower 14 filled with an adsorbent such as activated carbon, for example, as a gas treatment means for performing an adsorption treatment of a volatile organic compound or the like after the reaction tank 10. Moreover, the processing apparatus 1 may be equipped with the treated water tank 18 which stores the treated water which made the gas-liquid contact below the reaction tank 10. FIG.

  In the reaction vessel 10, a light emitter filling portion 44 is formed in an upper part of an airtight main body, and a mist separator 16 is installed above the light emitter filling portion 44 as a mist removing member. Sprinkling water having one or more watering nozzles as watering means for watering the volatile organic compound-containing water, which is the water to be treated, from above the light emitting body filling section 44 toward the light emitting body filling section 44. Part 15 is installed. Below the sprinkling portion 15 is a gas-liquid contact portion for bringing the volatile organic compound-containing water and gas into contact with each other, and the light emitter filling portion 44 is provided in the gas-liquid contact portion. Below the light emitter filling portion 44 of the gas-liquid contact portion, a filler portion 46 filled with a filler that is not an ultraviolet light emitter may be provided. In the reaction vessel 10, a microwave generator 12 is installed as a microwave generating means so that the granular light emitter of the light emitter filling portion 44 can be irradiated with microwaves.

  In the treatment apparatus 1 of FIG. 1, water to be treated is introduced into the reaction tank 10 from the upper part of the gas-liquid contact part of the reaction tank 10 toward the gas-liquid contact part to the treated water source (ground water in the example of FIG. 1). A pump 20 as the treatment water introducing means is immersed. The discharge side of the pump 20 and the water to be treated inlet of the sprinkler 15 at the top of the reaction tank 10 are connected by a water to be treated pipe 48 via a flow meter 22 and a valve 24. The gas outlet at the top of the reaction tank 10 and the inlet of the gas processing tower 14 are connected by a gas pipe 50. An exhaust gas pipe 52 is connected to the outlet of the gas processing tower 14. A blower 26 serving as a gas introducing means for introducing a gas such as air into the reaction tank 10 from below the gas-liquid contact part to the gas-liquid contact part is provided at the gas inlet at the lower part of the reaction tank 10. 30 is connected by a gas pipe 54. A treated water pipe 56 is connected to a treated water outlet of the treated water tank 18 below the reaction tank 10 through a pump 32 as treated water discharge means for discharging treated water in the treated water tank 18.

  Operation | movement of the processing method 1 and the processing apparatus 1 of volatile organic compound containing water which concern on this embodiment is demonstrated.

  The blower 26 is activated, the valve 30 is opened, and a gas such as air is introduced into the reaction vessel 10 from below the gas-liquid contact portion toward the filler portion 46 of the gas-liquid contact portion. On the other hand, when the microwave generator 12 is activated and the generated microwave is irradiated onto the granular light emitter of the light emitter filling portion 44, the water containing the volatile organic compound, which is the water to be treated, is opened. The water to be treated is fed into the reaction tank 10 from the water spray nozzle of the water sprinkling part 15 from the water to be treated to the light emitter filling part 44 of the gas liquid contact part from above the gas liquid contact part through the water to be treated 48 by the pump 20. be introduced. The volatile organic compound-containing water is formed into droplets by the water sprinkling unit 15 and is passed downward through the light emitter filling unit 44 and the filler unit 46 of the gas-liquid contact unit, while the gas is the filler of the gas-liquid contact unit. The part 46 and the light emitter filling part 44 are raised. In the illuminant filling unit 44, the volatile organic compound-containing water moves from the volatile organic compound-containing water to the gas (gas-liquid separation treatment) and fills the illuminant by the gas-liquid contact between the volatile organic compound-containing water droplet and the gas. Oxidative decomposition treatment of at least a part of the volatile organic compound is performed by the ultraviolet rays generated from the granular light emitter of the unit 44 (processing step). Oxidative decomposition treatment of volatile organic compounds or the like mainly by photo-oxidation of ultraviolet rays is performed mainly by the ultraviolet rays emitted from the particulate filter medium of the illuminant filling unit 44 by the microwave irradiation.

  After the moisture and the like are removed by the mist separator 16, the gas containing the volatile organic compound is sent from the gas outlet at the top of the reaction vessel 10 to the gas processing tower 14 as necessary through the gas pipe 50, and in the gas processing tower 14. The adsorbent such as activated carbon adsorbs and removes substances that are incompletely oxidized and decomposed (adsorption removal step). The adsorbed and removed exhaust gas is discharged through the exhaust gas pipe 52.

  On the other hand, the oxidative decomposition treated water that has been subjected to the gas-liquid separation process and the oxidative decomposition process in the light emitter filling unit 44 is filled with a filler that is provided as necessary and specialized for the gas-liquid separation function. In the part 46, a gas-liquid separation process is further performed by gas-liquid contact with gas. Thereby, gas-liquid separation can be performed more reliably. In this way, the treated water from which the volatile organic compound has passed through the light emitter filling portion 44 and the filler portion 46 of the gas-liquid contact portion is treated under the reaction tank 10 as necessary. After being stored in the water tank 18, the water is discharged through the treated water pipe 56 by the pump 32. The treated water may be directly discharged through the treated water pipe 56 or the like without providing the treated water tank 18.

  By the method and apparatus 1 for treating volatile organic compound-containing water according to the present embodiment, oxidative decomposition treatment can be performed together with gas-liquid separation treatment of the volatile organic compound from the volatile organic compound-containing water. In a packed tower type aeration apparatus, the whole or part of the packing material is made into a granular illuminant that emits ultraviolet light by microwaves, and irradiates the microwaves to move volatile organic compounds from the liquid to the air. Oxidative decomposition treatment with ultraviolet rays is performed together with gas-liquid separation treatment. Further, by performing both the gas-liquid separation process and the oxidative decomposition process, the installation area of the processing apparatus and the power consumption can be reduced.

  In addition, the packing material installed inside the packed tower type aeration apparatus is packed with at least one type of granular light emitting material that emits ultraviolet light by microwaves and a packing material specialized for gas-liquid separation function, and the light emitting material. Only the filling part 44 was irradiated with microwaves. Thereby, a gas-liquid separation process and the oxidation process of the volatile organic compound which moved to the air can be performed more reliably.

  Furthermore, the gas containing volatile organic compounds discharged from the upper part of the packed tower type aeration apparatus is passed through the gas processing tower 14 such as the activated carbon tower to adsorb and remove incompletely oxidized substances by photo-oxidation. I tried to do it. Compared with the case where the volatile organic compound after the gas-liquid separation process is adsorbed to an adsorbent such as activated carbon without performing the oxidative decomposition process as in the processing apparatus 7 shown in FIG. 4, the total amount or a part of the volatile organic compound. The life of the adsorbent can be extended by subjecting the material to oxidative decomposition.

  The volatile organic compound-containing water to be treated may be water containing a volatile organic compound, and is not particularly limited. Examples of the volatile organic compound include organic chlorine compounds such as trichloroethylene, tetrachloroethylene and 1,1,1-trichloroethane, and aromatic hydrocarbons such as benzene, toluene and xylene. In addition, the solid content may include, for example, a suspended substance. Even when solid content such as suspended substances is included, solid-liquid separation treatment can be performed by the granular illuminant functioning as a filter medium.

  The concentration of the volatile organic compound in the volatile organic compound-containing water to be treated is in the range of 0.01 mg / L to 1.0 mg / mL. Moreover, when it contains solid content, the turbidity of volatile organic compound containing water is 0.5 degree or more and 10 degrees or less, for example.

  The flow direction of the liquid to be treated in the reaction tank 10 is usually a downward flow as shown in FIG. 1, but may be an upward flow or a lateral flow.

  The microwave generator 12 is not particularly limited as long as it can generate microwaves (frequency: 2.45 GHz ± 0.01 GHz). For example, in addition to the magnetron method using a vacuum tube, a solid state method using a semiconductor can be used. Magnetron oscillators are widely used in household and commercial microwave ovens and have the advantage of being available at relatively low prices. Solid-state oscillators have a relatively long lifetime and good wavelength stability. There are some advantages.

  As a configuration example of the microwave generator 12, for example, as illustrated in FIG. 1, a configuration including a power supply device 34, a microwave oscillator 36, a waveguide 38, a sleeving tuner 40, and a short circuit 42. Can be mentioned. In FIG. 1, the microwave generator 12 includes one power supply device 34 and two main bodies (microwave oscillator 36, waveguide 38, stub tuner 40). What is necessary is just to set suitably according to the layer height etc. of the filling part 44, and there is no restriction | limiting in particular in the number.

  For example, the microwave generated by the microwave oscillator 36 is irradiated by the power supplied from the power supply device 34 to the granular light emitter of the light emitter filling portion 44 through the waveguide 38. The impedance matching in the waveguide 38 can be adjusted by the slice tab tuner 40.

  The microwave irradiation may be performed from one direction where the light emitter filling portion 44 is provided, or may be performed from a plurality of directions of two or more directions. When the diameter of the reaction vessel 10 becomes large (for example, 30 cm or more), the microwave may not reach the center portion, so it is preferable to irradiate the light emitter filling portion 44 from a plurality of directions of two or more directions.

  The granular illuminant of the illuminant filling part 44 is not particularly limited as long as it emits ultraviolet light by microwaves. Examples of the granular illuminant include mercury, hydrogen gas, xenon gas, nitrogen in a container made of quartz or Teflon (registered trademark) and having a spherical shape or a capsule shape in which both ends of a cylinder are spherical. Examples thereof include an electrodeless ultraviolet light emitting capsule in which a discharge gas such as gas, argon gas, helium gas, chlorine gas, and deuterium gas, which emits ultraviolet light by a microwave, is sealed at a predetermined sealing pressure. By irradiating a microwave to an electrodeless ultraviolet light emitting capsule enclosing a discharge gas, the gas is excited and emits ultraviolet light. The emission wavelength can be adjusted by appropriately selecting the discharge gas and the sealing pressure. Further, in order to adjust the specific gravity of the capsule, a hollow or solid protruding specific gravity adjusting portion formed of the same material as the capsule may be provided at both ends or one end of the capsule.

  When the granular light emitter is spherical, the maximum diameter is, for example, in the range of 1.0 mm to 10 mm, and preferably in the range of 2.0 mm to 4.0 mm. When the granular illuminant has a capsule shape in which both ends of the cylinder are spherical, the diameter is, for example, in the range of 1.0 mm to 10 mm, preferably in the range of 2.0 mm to 4.0 mm, and the height is For example, it is in the range of 2.0 mm to 20 mm, and preferably in the range of 4.0 mm to 8.0 mm.

  The diameter of the specific gravity adjusting unit is, for example, in the range of 1.0 mm to 10 mm, preferably in the range of 2.0 mm to 4.0 mm, and the height is, for example, in the range of 2.0 mm to 20 mm, It is preferable that it is the range of 4.0 mm-10 mm.

  The filler used in the filler portion 46 is not the above-described granular light emitter but a filler that is not an ultraviolet light emitter, and may be any filler that is specialized for the gas-liquid separation function, and is not particularly limited. For example, Raschig ring, Lessing ring, Perlus saddle, Inkrus saddle, Terralette packing, pole ring, etc. made of magnetism or made of resin such as polypropylene or vinyl chloride can be used. The size of the filler may normally be about 20 mm to 50 mm.

  The light emitter filling portion 44 may be provided in at least one layer, and the filler portion 46 may be provided in at least one layer as necessary. The stacking order of the light emitter filling portion 44 and the filler portion 46 is not particularly limited, but the light emitter filling portion 44 is provided on the upstream side in the gas-liquid contact portion of the reaction vessel 10, and the downstream side of the light emitter filling portion 44. In addition, it is preferable that a filler portion 46 is provided. Thereby, a gas-liquid separation process can be performed more reliably.

  The gas used for the gas-liquid contact is not particularly limited, and examples thereof include air, nitrogen gas, carbon dioxide gas, etc., and is usually air from the viewpoint of cost.

  The adsorbent used in the gas processing tower 14 which is a gas processing means is not particularly limited as long as it can adsorb a substance or the like incompletely oxidized and decomposed. Examples of the adsorbent include activated carbon, silica gel, zeolite, and the like, and activated carbon is preferable from the viewpoint of adsorption capacity, adsorption rate, and the like.

<Tray processing device>
(1) Type in which luminous body filling portion is provided after gas-liquid contact and before entering treatment water tank FIG. 2 shows an outline of another example of a treatment apparatus for volatile organic compound-containing water according to an embodiment of the present invention. The treatment apparatus 3 for volatile organic compound-containing water is an apparatus based on a gas-liquid separation treatment apparatus called a so-called tray type aeration apparatus. The treatment apparatus 3 for volatile organic compound-containing water includes a reaction tank 60 having a light emitter filling portion 66 filled with a granular light emitter that emits ultraviolet light by microwaves, and a microwave generator 12 as a microwave generating means. Prepare. The processing apparatus 3 may include a gas processing tower 14 filled with an adsorbent such as activated carbon, for example, as a gas processing means at the subsequent stage of the reaction tank 60. The reaction tank 60 has a gas-liquid contact part 62 in which the upper part of the airtightly configured main body is brought into contact with the volatile organic compound-containing water and the gas. The treated water tank 64 that stores the treated water in gas-liquid contact may be provided below.

  One or more (three in the example of FIG. 2) planar trays 80 are arranged in the gas-liquid contact portion 62 of the reaction tank 60. One or more aeration holes are formed on the bottom surface of each tray 80. A light emitter filling portion 66 is formed at a portion entering the treated water tank 64 from the lowermost tray 80. That is, the light emitter filling portion 66 is provided on the downstream side of the gas-liquid contact portion. In the reaction tank 60, a microwave generator 12 is installed as a microwave generator so that the granular illuminant of the illuminant filling unit 66 can be irradiated with microwaves.

  In the treatment apparatus 3 of FIG. 2, the water to be treated is supplied from the upper side of the gas-liquid contact portion 62 of the reaction tank 60 toward the uppermost tray 80 of the gas-liquid contact portion 62. As a means for introducing water to be treated into the reaction tank 60, the pump 20 is immersed. The discharge side of the pump 20 and the water to be treated inlet at the top of the reaction tank 60 are connected by a water to be treated piping 72. The gas outlet at the top of the reaction tank 60 and the inlet of the gas processing tower 14 serve as gas introduction means for introducing a gas such as air from the lower part of the gas-liquid contact part 62 toward the gas-liquid contact part 62 into the reaction tank 60. Are connected by a gas pipe 74 through a blower 68. An exhaust gas pipe 76 is connected to the outlet of the gas processing tower 14. A gas inlet 82 is provided on the lower side of the reaction tank 60. A treated water pipe 78 is connected to a treated water outlet of the treated water tank 64 below the reaction tank 60 via a pump 70 as a treated water discharge means for discharging treated water in the treated water tank 64.

  The operation | movement of the processing method 3 of the processing method 3 of volatile organic compound containing water which concerns on this embodiment, and volatile organic compound containing water is demonstrated.

  The blower 68 is activated, and a gas such as air passes through the gas inlet 82 and is introduced into the reaction tank 60 from below the gas-liquid contact portion 62 toward the gas-liquid contact portion 62. On the other hand, when the microwave generator 12 is activated and the generated microwave is irradiated onto the granular light emitter of the light emitter filling section 66, the volatile organic compound-containing water as the water to be treated is pumped from the water source to be treated. 20, the water is introduced into the reaction tank 60 from the upper side of the gas-liquid contact part 62 toward the inlet side of the uppermost tray 80 through the water pipe 72 to be treated.

  The volatile organic compound-containing water introduced into the reaction tank 60 flows on the uppermost tray 80. The volatile organic compound-containing water that has reached the outlet of the uppermost tray 80 falls to the next lower tray 80 and flows along the tray 80 in the same manner. In this way, the volatile organic compound-containing water flows from the uppermost tray 80 to the lowermost tray 80 and then passed through the light emitter filling portion 66. On the other hand, the gas blown upward from the lower side of the reaction tank 60 by the blower 68 enters the flow path of the tray 80 through the aeration holes formed in the bottom surface of each tray 80. At this time, the gas that has entered each tray 80 comes into gas-liquid contact with the volatile organic compound-containing water flowing in the flow path of the tray 80, and the volatile organic compound moves from the volatile organic compound-containing water to the gas (gas-liquid separation). processing). At the same time, after flowing on each tray 80 of the gas-liquid contact portion 62, the gas-liquid separation treated water is oxidized by at least a part of the volatile organic compound by ultraviolet rays generated from the granular light emitter in the light emitter filling portion 66. Decomposition processing is performed (processing step). Oxidative decomposition treatment of a volatile organic compound or the like mainly by photooxidation of ultraviolet rays is performed by ultraviolet rays emitted from the particulate filter medium of the illuminant filling portion 66 by microwave irradiation.

  In this manner, the treated water from which the volatile organic compound has been removed that has passed through the gas-liquid contact unit 62 and the light emitter filling unit 66 is stored in a treated water tank 64 provided below the reaction tank 60 as necessary. Then, the water is discharged through the treated water piping 78 by the pump 70. The treated water may be directly discharged through the treated water piping 78 or the like without providing the treated water tank 64.

  On the other hand, the gas rises from the lowermost tray 80 to the uppermost tray 80 while absorbing the volatile organic compounds by gas-liquid contact with the volatile organic compound-containing water flowing in each tray 80, and finally the reaction tank The gas is sent from the upper part of 60 to the gas processing tower 14 through the gas pipe 74 as necessary. In the gas processing tower 14, volatile organic compounds and the like are adsorbed and removed by an adsorbent such as activated carbon (adsorption removal step). The adsorbed and removed exhaust gas is discharged through the exhaust gas pipe 76.

  The volatile organic compound-containing water treatment method and treatment apparatus 3 according to this embodiment can perform oxidative decomposition treatment together with gas-liquid separation treatment of volatile organic compounds from volatile organic compound-containing water. In the tray-type aeration apparatus, after the gas-liquid contact, before entering the treated water tank 64, the liquid is passed through the illuminant filling unit 66, and the microwave is irradiated to the volatile organic compound from the liquid into the air. Oxidative decomposition treatment with ultraviolet rays is performed together with gas-liquid separation treatment to be moved. Further, by performing both the gas-liquid separation process and the oxidative decomposition process, the installation area of the processing apparatus and the power consumption can be reduced.

  In addition, such aeration treatment is usually possible depending on the concentration of volatile organic compounds in the water to be treated by increasing or decreasing the number of trays or adjusting the flow rate of the water to be treated and the air volume of the blower. It is. However, in the case of purification of groundwater and the like contaminated with volatile organic compounds, the concentration of volatile organic compounds in the groundwater or the like may increase after a while from the start of pumping depending on the pumping status of the groundwater or the like. In such a case, it is very difficult to change the flow rate of the water to be treated and the air volume of the blower each time, and volatile organic compounds may remain in the treated water even after the gas-liquid separation treatment. Therefore, as shown in FIG. 2, the volatile organic compound-containing water is obtained by oxidizing and decomposing the gas-liquid separated water after the gas-liquid separating process and oxidizing and decomposing the volatile organic compound in the water after the gas-liquid separating process. Even when the volatile organic compound concentration of water is high, the gas-liquid separation process can be performed without increasing the number of stages of the tray 80 as compared with the case where the oxidative decomposition process is not performed as in the processing apparatus 9 shown in FIG. Therefore, the height of the processing device 3 can be suppressed.

(2) Type in which luminous body filling part is provided in gas discharge part after gas-liquid contact Another example of the treatment apparatus for volatile organic compound-containing water according to the embodiment of the present invention is schematically shown in FIG. The volatile organic compound-containing water treatment device 5 is also a device based on a gas-liquid separation treatment device called a tray type aeration device, similarly to the treatment device 3 of FIG. The treatment apparatus 5 for volatile organic compound-containing water includes a reaction tank 60 having a light emitter filling portion 66 filled with a granular light emitter that emits ultraviolet light by microwaves, and a microwave generator 12 as a microwave generating means. Prepare. The reaction tank 60 has a gas-liquid contact part 62 in which the upper part of the airtightly configured main body is brought into contact with the volatile organic compound-containing water and the gas. The treated water tank 64 that stores the treated water in gas-liquid contact may be provided below.

  One or more (three in the example of FIG. 3) planar trays 80 are arranged in the gas-liquid contact portion 62 of the reaction tank 60. One or more aeration holes are formed on the bottom surface of each tray 80. A light emitter filling portion 66 is formed in a gas discharge portion for discharging gas from the upper part of the reaction tank 60. That is, the light emitter filling portion 66 is provided in the gas discharge portion at the top of the reaction tank 60. In the reaction tank 60, a microwave generator 12 is installed as a microwave generator so that the granular illuminant of the illuminant filling unit 66 can be irradiated with microwaves.

  In the treatment apparatus 5 of FIG. 3, the water to be treated is supplied from the upper side of the gas-liquid contact portion 62 of the reaction tank 60 toward the uppermost tray 80 of the gas-liquid contact portion 62. As a means for introducing water to be treated into the reaction tank 60, the pump 20 is immersed. The discharge side of the pump 20 and the water to be treated inlet at the top of the reaction tank 60 are connected by a water to be treated piping 72. A blower as a gas introduction means for introducing a gas such as air into the reaction tank 60 from below the gas-liquid contact part 62 toward the gas-liquid contact part 62 at the gas outlet of the light emitter filling part 66 at the top of the reaction tank 60. An exhaust gas pipe 84 is connected via 68. A gas inlet 82 is provided on the lower side of the reaction tank 60. A treated water pipe 78 is connected to a treated water outlet of the treated water tank 64 below the reaction tank 60 via a pump 70 as a treated water discharge means for discharging treated water in the treated water tank 64.

  The operation | movement of the processing method 5 of the volatile organic compound containing water which concerns on this embodiment, and the processing apparatus 5 of volatile organic compound containing water is demonstrated.

  The blower 68 is activated, and a gas such as air passes through the gas inlet 82 and is introduced into the reaction tank 60 from below the gas-liquid contact portion 62 toward the gas-liquid contact portion 62. On the other hand, when the microwave generator 12 is activated and the generated microwave is irradiated onto the granular light emitter of the light emitter filling section 66, the volatile organic compound-containing water as the water to be treated is pumped from the water source to be treated. 20, the water is introduced into the reaction tank 60 from the upper side of the gas-liquid contact part 62 toward the inlet side of the uppermost tray 80 through the water pipe 72 to be treated.

  The volatile organic compound-containing water introduced into the reaction tank 60 flows on the uppermost tray 80. The volatile organic compound-containing water that has reached the outlet of the uppermost tray 80 falls to the next lower tray 80 and flows along the tray 80 in the same manner. In this way, the volatile organic compound-containing water flows from the uppermost tray 80 to the lowermost tray 80. On the other hand, the gas blown upward from the lower side of the reaction tank 60 by the blower 68 enters the flow path of the tray 80 through the aeration holes formed in the bottom surface of each tray 80. At this time, the gas that has entered each tray 80 comes into gas-liquid contact with the volatile organic compound-containing water flowing through the flow path of the tray 80, and the volatile organic compound moves from the volatile organic compound-containing water to the gas (gas-liquid separation). After the treatment), the luminous body filling section 66 is ventilated, and at least a part of the volatile organic compound is subjected to oxidative decomposition treatment by ultraviolet rays generated from the granular luminous body in the luminous body filling section 66 (processing step). Oxidative decomposition treatment of a volatile organic compound or the like mainly by photooxidation of ultraviolet rays is performed by ultraviolet rays emitted from the particulate filter medium of the illuminant filling portion 66 by microwave irradiation.

  In this way, the treated water from which the volatile organic compound has been removed that has passed through the gas-liquid contact portion 62 is stored in a treated water tank 64 provided below the reaction tank 60 as necessary, and then pump 70. Is discharged through the treated water piping 78. The treated water may be directly discharged through the treated water piping 78 or the like without providing the treated water tank 64.

  On the other hand, the gas rises from the lowermost tray 80 to the uppermost tray 80 while absorbing the volatile organic compound by gas-liquid contact with the volatile organic compound-containing water flowing in each tray 80, and the light emitter filling portion 66. The oxidative decomposition treatment is performed in FIG. 3 and finally exhausted from the upper part of the reaction tank 60 as exhaust gas through the exhaust gas pipe 84.

  By the processing method and the processing apparatus 5 for volatile organic compound-containing water according to the present embodiment, the oxidative decomposition treatment can be performed together with the gas-liquid separation processing of the volatile organic compound from the volatile organic compound-containing water. In the tray type aeration apparatus, a light emitter filling portion 66 is provided in the gas discharge portion at the top of the reaction tank 60 to oxidatively decompose volatile organic compounds in the gas after the gas-liquid contact. Thereby, it is not necessary to provide gas processing means such as an activated carbon tower, and the apparatus area can be made more compact. In the processing apparatus 5, it is not necessary to provide a gas processing means, but if necessary, a gas processing tower filled with an adsorbent such as activated carbon is provided as a gas processing means at the subsequent stage of the reaction tank 60. Also good.

  2 is combined with the processing apparatus 5 of FIG. 3, that is, the light emitter filling part 66 is formed in the part entering the processing water tank 64 from the lowermost tray 80 in FIG. In other words, the configuration in which the light emitter filling portion 66 is provided on the downstream side of the gas-liquid contact portion, and the gas discharge portion for discharging gas from the upper part of the reaction tank 60 in FIG. It is good also as a processing apparatus provided with both the structure by which 66 is formed, ie, the structure by which the light emission body filling part 66 is provided in the gas discharge part of the upper part of the reaction tank 60. FIG. Thereby, even if the concentration of the volatile organic compound in the volatile organic compound-containing water is high, the gas-liquid separation process can be performed without increasing the number of trays 80. Therefore, it is not necessary to provide gas processing means such as an activated carbon tower, and the apparatus area can be made more compact.

  A conventionally known tray 80 may be used, and the number, size, and shape of the aeration holes of the tray 80 and the number of the trays 80 may be set as appropriate.

  The method and apparatus for treating volatile organic compound-containing water according to the present embodiment is applied when performing both gas-liquid separation and recovery treatment and oxidative decomposition treatment of volatile organic compounds in water purification treatment, groundwater purification treatment, and wastewater treatment. can do.

  Hereinafter, although an example and a comparative example are given and the present invention is explained more concretely in detail, the present invention is not limited to the following examples.

<Example 1, comparative example 1>
The test was conducted under the following equipment specifications and water flow conditions. The apparatus shown in FIG. 1 was used in Example 1, and the conventional method using the processing apparatus 7 shown in FIG. 4 was used in Comparative Example 1. Table 1 shows the treated water, the quality of each treated water, and the regeneration interval of the activated carbon.

[Reactor]
Example 1
・ Reaction tank: reaction tower diameter (φ) 200 mm × height (H) 6,000 mm (of which filling portion (filler portion + luminous body filling portion) 4,000 mm)
-Filler part: Filled with metallet (made of SUS304, nominal dimension 40 mm), packed bed height 2,000 mm
・ Light emitter filling part: Filled with UV light emitting granular light emitter, filling layer height of 2,000 mm
・ Raw water pump: Maximum flow rate 3.0m ³ / h, lift 30m
・ Blower: Vortex blower 180m ³ / h, 500mmAq
-Gas treatment tower: exhaust gas adsorption tower diameter (φ) 550 mm x height (H) 1,000 mm x 2 towers, activated carbon packed part volume 0.14 m ³ x 2 towers (Comparative Example 1)
Reaction tank: reaction tower diameter (φ) 200 mm × height (H) 6,000 mm (of which the filler part is 4,000 mm)
-Filler part: Filled with metallet (SUS304, nominal size 40mm), packed bed height 4,000mm
・ Raw water pump: Maximum flow rate 3.0m ³ / h, lift 30m
・ Blower: Vortex blower 180m ³ / h, 500mmAq
-Gas treatment tower: Exhaust gas adsorption tower Diameter (φ) 550 mm x Height (H) 1,000 mm x 2 towers

[Details of UV light emitting granular light emitter (electrodeless UV light emitting capsule)]
・ Size: Gas filling part Diameter (φ) 5mm x Height (L) 10mm
-Material: Quartz-Filling gas: Mercury gas, Filling pressure 50,000 Pa
・ Peak wavelength: 185nm

[Microwave generator]
・ Power supply: 3,000W
・ Microwave oscillator: 2 magnetron systems ・ Frequency: 2.45 GHz
・ Waveguide: L400mm × W200mm × H400mm, made of aluminum ・ Tuner: Three tabs method

[Operating conditions]
In common with Example 1 and Comparative Example 1, water flow and ventilation were performed in the reaction tower at a water flow rate (L) of 3 m ³ / h, a flow rate (G) of 120 m ³ / h, and G / L = 40. Further, the exhaust gas from the upper part of the reaction tower was vented to the exhaust gas adsorption tower at 120 m / h, SV429h ⁻¹ (calculated only with the activated carbon part). The raw water temperature was 17 ° C and the exhaust temperature was 18 ° C.

  Regarding Example 1, a microwave was generated with an input power of 1,200 W per microwave generator.

  As shown in Table 1, the trichlorethylene concentration was <0.001 mg / L in the treated water for both Example 1 and Comparative Example 1 relative to 0.08 mg / L of raw water, but the activated carbon inlet concentration was Comparative Example 1. Was 2.0 μg / L, whereas Example 1 was as low as 1.2 μg / L. The activated carbon regeneration interval was 1.5 times as long as 360 hours in Example 1 compared to 240 hours in Comparative Example 1.

  Thus, the treatment apparatus and method of Example 1 enabled the oxidative decomposition treatment of the volatile organic compound together with the gas-liquid separation treatment of the volatile organic compound from the volatile organic compound-containing water. In one reaction tank, gas-liquid separation and oxidative decomposition of volatile organic compounds can be performed simultaneously. Moreover, the installation area and power consumption of the processing apparatus could be reduced.

  1,3,5,7,9 treatment device, 10,60 reaction vessel, 12 microwave generator, 14 gas treatment tower, 15 sprinkling unit, 16 mist separator, 18,64 treatment water vessel, 20, 32, 70 pump, 22, 28 Flowmeter, 24, 30 Valve, 26, 68 Blower, 34 Power Supply, 36 Microwave Oscillator, 38 Waveguide, 40 Slice Tab Tuner, 42 Short Circuit, 44, 66 Light Emitter Filler, 46 Filler Part, 48, 72 treated water pipe, 50, 74 gas pipe, 52, 76, 84 exhaust gas pipe, 54 gas pipe, 56, 78 treated water pipe, 62 gas-liquid contact part, 80 tray, 82 gas inlet.

Claims (10)

A reaction tank having a gas-liquid contact portion for bringing a volatile organic compound-containing water containing a volatile organic compound into contact with a gas, and a light emitter filling portion filled with a granular light emitter that emits ultraviolet light by a microwave;
Microwave generation means;
With
While irradiating the granular illuminant with the microwave generated by the microwave generating means, the volatile organic compound-containing water is passed through the gas-liquid contact portion, and the volatile organic compound-containing water is volatile. An apparatus for treating volatile organic compound-containing water, which performs oxidative decomposition treatment of the volatile organic compound together with gas-liquid separation treatment for transferring the volatile organic compound to the gas. The volatile organic compound-containing water treatment apparatus according to claim 1,
An apparatus for treating volatile organic compound-containing water, wherein the light emitter filling portion is provided in the gas-liquid contact portion. The volatile organic compound-containing water treatment apparatus according to claim 2,
The light emitter filling portion is provided upstream in the gas-liquid contact portion, and a filler portion filled with a filler that is not an ultraviolet light emitter is provided downstream of the light emitter filling portion. A volatile organic compound-containing water treatment apparatus. The volatile organic compound-containing water treatment apparatus according to claim 1,
The apparatus for treating volatile organic compound-containing water, wherein the light emitter filling portion is provided on the downstream side of the gas-liquid contact portion. The volatile organic compound-containing water treatment apparatus according to claim 1,
The apparatus for treating volatile organic compound-containing water, wherein the light emitter filling unit is provided in a gas discharge unit at an upper part of the reaction tank. The microwave generated by the microwave generation means
The granular material in a reaction vessel comprising: a gas-liquid contact portion for bringing a volatile organic compound-containing water containing a volatile organic compound into contact with a gas; and a light emitter filling portion filled with a granular light emitter that emits ultraviolet light by a microwave. While irradiating the illuminant, let the volatile organic compound-containing water pass through the gas-liquid contact part,
A method for treating volatile organic compound-containing water, comprising performing a gas-liquid separation treatment for transferring the volatile organic compound from the volatile organic compound-containing water to the gas and an oxidative decomposition treatment of the volatile organic compound. It is a processing method of volatile organic compound content water according to claim 6,
The method for treating volatile organic compound-containing water, wherein the light-emitting body filling portion is provided in the gas-liquid contact portion. It is a processing method of volatile organic compound content water according to claim 7,
The light emitter filling portion is provided upstream in the gas-liquid contact portion, and a filler portion filled with a filler that is not an ultraviolet light emitter is provided downstream of the light emitter filling portion. A method for treating water containing volatile organic compounds. It is a processing method of volatile organic compound content water according to claim 6,
The method for treating volatile organic compound-containing water, wherein the light emitter filling portion is provided downstream of the gas-liquid contact portion. It is a processing method of volatile organic compound content water according to claim 6,
The method for treating volatile organic compound-containing water, characterized in that the light emitter filling portion is provided in a gas discharge portion at an upper portion of the reaction tank.