JP2013138983A - Water recycling apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water recycling apparatus which does not need to supply a clean water or sodium chloride.SOLUTION: A water purifying unit (10) is provided with: a storage tank (11) storing rain water; a discharge unit (62) which has an electrode pair provided in the storage tank (11) and generating electric discharge in a stored water in the tank (11), a power source applying voltage to the electrode pair, and purifies the stored water by generating a hydroxide radical in the stored water by electric discharge; and an ultrasonic generation part (94) which decomposes the hydrogen peroxide generated in the stored water to obtain the hydroxide radical by applying ultrasonic waves.

Description

    The present invention relates to a water reuse device that purifies rainwater or well water.

    Conventionally, water reuse devices for reusing rainwater have been proposed. As shown in Patent Document 1, the water reuse device includes a storage tank that stores rainwater and an electrolyzed water supply device. The electrolyzed water supply device is connected to a water supply pipe and a salt supply pipe, and includes a pair of a cathode and an anode. And the said electrolyzed water supply apparatus produces | generates electrolyzed water by electrolyzing the clean water with which salt was added, supplies this electrolyzed water to a storage tank, and purifies the rain water in a storage tank.

Japanese Patent Laid-Open No. 11-343643

    However, since the conventional water recycling apparatus uses electrolysis, it has been necessary to use clean water or salt to generate electrolyzed water. That is, since rain water and well water do not contain chlorine, electrolysis water cannot be generated by electrolysis only with rain water or well water, and cannot be purified. Therefore, since the conventional water recycling apparatus needs to separately provide a device for supplying clean water and salt, the configuration is complicated and the device itself is large.

    This invention is made | formed in view of such a point, and it aims at providing the water reuse apparatus which does not need to supply clean water or salt.

    The first invention is a storage tank (11) for storing rain water or well water, and an electrode pair (64, 64A) that is provided in the storage tank (11) and causes discharge in the stored water in the storage tank (11). , 64B, 64C, 65,65A, 65B, 65C) and power supply (70,70A, 70B, 70C) for applying voltage to the electrode pair (64,64A, 64B, 64C, 65,65A, 65B, 65C) A discharge unit (62) that generates hydroxyl radicals in the stored water by the discharge to purify the stored water, and water is generated by applying ultrasonic waves to hydrogen peroxide generated in the stored water. And an ultrasonic generator (94) that decomposes into acid radicals.

    In the said 1st invention, the rain water or well water stored by the storage tank (11) is purified by the hydroxyl radical by the discharge of a discharge unit (62), and the purified water is reused.

    In the first aspect of the invention, purification by hydroxyl radicals generated by discharge, purification by hydrogen peroxide generated in stored water, and purification by hydroxyl radicals generated by ultrasonically decomposing hydrogen peroxide. In combination, rain water or well water stored in the storage tank (11) can be effectively purified.

    According to a second invention, in the first invention, the discharge unit (62) is provided at a bottom portion inside the storage tank (11).

    In the second aspect of the invention, active species such as hydroxyl radicals and hydrogen peroxide are convected in the storage tank (11) by heat accompanying discharge, and the stored water in the storage tank (11) is purified.

    According to a third invention, in the first invention, a first control unit (1) for controlling on or off of a voltage applied to the electrode pair (64, 64A, 64B, 64C, 65, 65A, 65B, 65C) And a second control unit (5) for controlling the operation of the ultrasonic wave generation unit (94), wherein the first control unit (1) and the second control unit (5) On / off of the voltage applied to the electrode pair (64, 64A, 64B, 64C, 65, 65A, 65B, 65C) and the ultrasonic wave so that the concentration of hydrogen peroxide contained does not exceed a predetermined upper limit. The operation of the generator (94) is controlled.

    In the third invention, since the hydrogen peroxide concentration of the stored water in the storage tank (11) is suppressed to the upper limit value or less, the stored water can be safely purified while avoiding the damage caused by the generation of excessive hydrogen peroxide.

    A fourth invention further includes a sensor (7) for monitoring the concentration of hydrogen peroxide contained in the stored water in the third invention, wherein the first control unit (1) is based on the sensor (7). The second control unit (5) controls the on-off of the voltage applied to the electrode pair (64, 64A, 64B, 64C, 65, 65A, 65B, 65C) according to the monitoring result. The operation of the ultrasonic wave generator (94) is controlled in accordance with the monitor result of 7).

    According to a fifth invention, in the fourth invention, when at least the concentration of hydrogen peroxide in the stored water exceeds the upper limit, the first control unit (1) controls the electrode pair (64, 64A). , 64B, 64C, 65, 65A, 65B, 65C) to turn off the voltage to stop the discharge, and the second control unit (5) operates the ultrasonic wave generation unit (94). It is.

    In a sixth aspect based on any one of the third to fifth aspects, the second control unit (5) is configured such that the concentration of hydrogen peroxide contained in the stored water is lower than a predetermined lower limit. During the period exceeding the value, the ultrasonic wave generator (94) is turned on.

    In the sixth aspect of the invention, the ultrasonic generator (94) is turned on when the hydrogen peroxide concentration of the stored water in the storage tank (11) is equal to or higher than the lower limit value. Hydroxyl radicals can be generated efficiently and continuously from hydrogen peroxide in the stored water.

    According to a seventh invention, in the first invention, the on / off control of the voltage applied to the electrode pair (64, 64A, 64B, 64C, 65, 65A, 65B, 65C) and the ultrasonic generator ( 94), and the control unit controls the electrode pair (64, 64A, 64B) so that the concentration of hydrogen peroxide contained in the stored water does not exceed a predetermined upper limit value. , 64C, 65, 65A, 65B, 65C), and controls on / off of the voltage applied to the ultrasonic wave generation unit (94).

    In the seventh invention, since the hydrogen peroxide concentration of the stored water in the storage tank (11) is suppressed to the upper limit value or less, it is possible to safely purify the stored water while avoiding the damage caused by the generation of excessive hydrogen peroxide.

    In an eighth aspect based on the seventh aspect, the control unit, when the concentration of hydrogen peroxide contained in the stored water exceeds a predetermined upper limit value, the electrode pair (64, 64A, 64B, 64C, 65, 65A, 65B, 65C) is turned off to stop the discharge, and during a period in which the concentration of hydrogen peroxide contained in the stored water exceeds a predetermined lower limit lower than the upper limit, The ultrasonic generator (94) is turned on.

    According to a ninth invention, in the first invention, the apparatus further comprises discharge means (119) for discharging bubbles into the stored water, and delivery means (99) for sending gas to the discharge means (119). (64B, 65B) are plate-like and arranged so as to face each other, and the power source (70B) applies a pulse voltage to the electrode pair (64B, 65B), and the discharge means (119) Is arranged between the electrode pair (64B, 65B) and at the bottom of the storage tank (11).

    According to a tenth aspect of the present invention, in the first to ninth aspects of the invention, the storage tank (11) is connected to the introduction pipe (21) for guiding rainwater, and the storage water purified by the discharge unit (62) A water pipe (12) to be supplied to a predetermined location is connected.

    In the tenth aspect of the invention, rain water is stored in the storage tank (11), and purified water is supplied to a predetermined location via the water pipe (12).

    According to the present invention, since discharge is caused in the stored water to generate hydroxyl radicals, rainwater and well water can be reliably purified.

    In particular, since hydroxyl radicals are generated by electric discharge, it is not necessary to use clean water or salt as compared with the case of purifying rain water or well water by using electrolysis, and a discharge unit (62) that simply generates electric discharge. The stored water in the storage tank (11) can be reliably purified. As a result, it is possible to realize a water recycling apparatus that does not need to supply clean water or salt.

    Further, according to the present invention, purification by hydroxyl radicals generated by discharge, purification by hydrogen peroxide generated in stored water, and purification by hydroxyl radicals generated by ultrasonically decomposing hydrogen peroxide are performed. By combining them, it is possible to suppress an increase in the hydrogen peroxide concentration of the stored water while exhibiting a high purification capacity as compared with the case of purifying the stored water in the storage tank (11) using only discharge.

    According to the second aspect of the invention, since the discharge unit (62) is provided at the bottom of the storage tank (11), active species such as hydroxyl radicals and hydrogen peroxide are stored by heat accompanying discharge. Convection in the tank (11). This convection promotes diffusion of active species such as hydroxyl radicals and hydrogen peroxide in water. As a result, the entire stored water in the storage tank (11) is reliably purified.

    According to the third aspect of the invention, the hydrogen peroxide concentration of the stored water in the storage tank (11) can be suppressed to the upper limit value or less, so that the hydrogen peroxide removal process when supplying the stored water to the outside Becomes unnecessary or easy.

    According to the fourth aspect of the present invention, the first control unit (1) and the second control unit (5) are configured to control the discharge based on the hydrogen peroxide concentration of the stored water in the storage tank (11). Since the ultrasonic irradiation is controlled, the purification treatment can be performed while controlling the hydrogen peroxide concentration of the stored water to be within a desired range.

    According to the fifth aspect of the present invention, when the hydrogen peroxide concentration of the stored water in the storage tank (11) exceeds the upper limit value, the discharge is stopped and the generation of hydrogen peroxide is stopped. Since the hydrogen peroxide concentration of the stored water can be made lower than the upper limit value, it is not necessary or easy to remove hydrogen peroxide from the purified water.

    According to the sixth aspect of the invention, since the hydrogen peroxide concentration of the stored water in the storage tank (11) can be controlled to a lower limit value or more, the hydroxyl radicals are efficiently used when irradiated with ultrasonic waves. It can be generated well.

    Further, according to the seventh invention, the hydrogen peroxide concentration of the stored water in the storage tank (11) can be suppressed to the upper limit value or less, so the hydrogen peroxide removing process when supplying the stored water to the outside Becomes unnecessary or easy.

    Further, according to the eighth aspect of the invention, the hydrogen peroxide concentration of the stored water in the storage tank (11) can be controlled to a lower limit value or more, so that the hydroxyl radicals are efficiently used when irradiated with ultrasonic waves. It can be generated well.

    According to the ninth aspect of the invention, since a discharge can be caused even when a pulse voltage is applied to the electrode pair (64B, 65B), the storage tank ( 11) Hydroxyl radicals can be efficiently generated in the stored water in the water to obtain a high purification effect.

    According to the tenth aspect of the invention, since the water supply pipe (12) is connected to the storage tank (11), purified water can be reliably supplied to a toilet or the like.

FIG. 1 is a schematic configuration diagram illustrating an overall configuration of a water purification unit according to the first embodiment. FIG. 2 is an overall configuration diagram of the water purification unit according to the first embodiment, and shows a state before the water purification operation is started. FIG. 3 is a perspective view of the insulating casing according to the first embodiment. 4A and 4B are enlarged cross-sectional views illustrating specific examples of the ultrasonic wave generation unit in the water purification unit according to the first embodiment. FIG. 5 is an overall configuration diagram of the water purification unit according to the first embodiment, and shows a state in which air purification is started and bubbles are formed. FIG. 6 is a diagram illustrating a basic cycle of processing by the water purification unit according to the first embodiment. FIG. 7 is a time chart illustrating an example of operation control when feedback control is performed using the concentration of hydrogen peroxide in the stored water in the processing by the water purification unit according to the first embodiment. FIG. 8 is an overall configuration diagram of a water purification unit according to Modification 1 of Embodiment 1. FIG. 9 is a perspective view of an insulating casing according to a modification of the first embodiment. FIG. 10 is a time chart illustrating an example of operation control in the case where feedforward control is performed using the concentration of hydrogen peroxide in stored water in the processing by the water purification unit according to the first embodiment. FIG. 11 is an overall configuration diagram of a water purification unit according to Embodiment 2, and shows a state before the water purification operation is started. FIG. 12 is an overall configuration diagram of the water purification unit according to the second embodiment, and shows a state in which air purification is started and bubbles are formed. FIG. 13 is a plan view of the lid portion of the insulating casing according to the modification of the second embodiment. FIG. 14 is an overall configuration diagram of a water purification unit according to the third embodiment. FIG. 15 is an overall configuration diagram of a water purification unit according to the fourth embodiment. FIG. 16 is an overall configuration diagram of a water purification unit according to the fifth embodiment.

    Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

<Embodiment 1>
As shown in FIG. 1, a water purification unit (10) that is a water reuse device of the present embodiment is provided in a house (20), and includes a storage tank (11), a discharge unit (62), and an ultrasonic generator ( 94).

    The said storage tank (11) is provided in the garden of a house (20), etc., and is comprised so that rainwater (22) may be stored. The storage tank (11) is connected with a tub (21), which is an introduction pipe for guiding rainwater (22), and is stored by the discharge unit (62) and the ultrasonic generator (94). A water pipe (12) for supplying purified water from the tank (11) to a predetermined location such as a toilet is connected. The water pipe (12) is provided with a water pump (13).

    The discharge unit (62) discharges in the water stored in the storage tank (11) to generate a purification component such as a hydroxyl radical in the water, and purifies the stored water using the purification component. The ultrasonic wave generator (94) improves the purification ability by decomposing hydrogen peroxide generated by the bonding of the hydroxyl radicals and returning them to the hydroxyl radicals by applying ultrasonic waves. And the said discharge unit (62) and the said ultrasonic wave generation part (94) are provided in the bottom part inside the storage tank (11), as shown in FIG.

    The discharge unit (62) includes an electrode pair (64, 65) including a first electrode (64) and a second electrode (65), and a power supply unit (high voltage) for applying a voltage to the electrode pair (64, 65). A voltage generation unit) (70) and an insulating casing (71) for accommodating the first electrode (64) therein.

    Here, as shown in FIG. 2, the water purification unit (10) has a discharge waveform generator (3) connected to the high voltage generator (70) and a voltage applied to the electrode pair (64, 65). A control unit (1) that controls on or off, an ultrasonic waveform generation unit (8) that supplies an AC voltage of a predetermined frequency to the ultrasonic generation unit (94) via the amplifier (9), and an ultrasonic waveform A control unit (5) for controlling the operation of the ultrasonic wave generation unit (94) through the generation unit (8) and a sensor (7) for monitoring the hydrogen peroxide concentration of the stored water in the storage tank (11) ing. Although not shown, a central processing unit (CPU) that controls the control units (1, 5) based on the monitoring result of the sensor (7) may be provided. A method for controlling the discharge unit (62) and the ultrasonic wave generation unit (94) by the control unit (1, 5) will be described later. In addition, when performing so-called feedforward control described later, the sensor (7) is not necessarily provided.

    The electrode pair (64, 65) is for causing discharge in water. The first electrode (64) is disposed inside the insulating casing (71). The first electrode (64) is formed in a flat plate shape up and down. The first electrode (64) is connected to the positive electrode side of the high voltage generator (70). The first electrode (64) is made of, for example, a conductive metal material such as stainless steel or copper.

    The second electrode (65) is disposed outside the insulating casing (71). The second electrode (65) is provided above the first electrode (64). The second electrode (65) has a flat plate shape in the vertical direction and is configured in a mesh shape or a punching metal shape having a plurality of through holes (66) in the vertical direction. The second electrode (65) is disposed substantially parallel to the first electrode (64). The second electrode (65) is connected to the negative electrode side of the high voltage generator (70). The second electrode (65) is made of a conductive metal material such as stainless steel or brass.

    The high voltage generator (70) is constituted by a DC power source that applies a predetermined DC voltage to the electrode pair (64, 65). That is, the high voltage generator (70) is not a pulse power source that repeatedly applies a high voltage instantaneously to the electrode pair (64, 65), but is always several kilovolts to the electrode pair (64, 65). Apply the DC voltage. Of the high voltage generator (70), the negative electrode side to which the second electrode (65) is connected is connected to the ground. The high voltage generator (70) is provided with a constant power controller (not shown) that controls the discharge power of the electrode pair (64, 65) to be constant.

    The insulating casing (71) is installed at the bottom of the storage tank (11). The insulating casing (71) is made of an insulating material such as ceramics. The insulating casing (71) has a container-like case body (72) whose one surface (upper surface) is open, and a plate-like lid (73) that closes the open portion above the case body (72). doing.

    The case body (72) has a square cylindrical side wall (72a) and a bottom (72b) that closes the bottom of the side wall (72a). The first electrode (64) is laid on the upper side of the bottom (72b). In the insulating casing (71), the vertical distance between the lid (73) and the bottom (72b) is longer than the thickness of the first electrode (64). That is, a predetermined interval is secured between the first electrode (64) and the lid portion (73). Thereby, a space (S) is formed between the first electrode (64), the case body (72), and the lid portion (73) inside the insulating casing (71).

    As shown in FIGS. 2 and 3, the opening (74) penetrating the lid (73) in the thickness direction is formed in the lid (73) of the insulating casing (71). This opening (74) allows the formation of an electric field between the first electrode (64) and the second electrode (65). The inner diameter of the opening (74) of the lid (73) is preferably 0.02 mm or more and 0.5 mm or less. The opening (74) as described above constitutes a current density concentration portion that increases the current density of the current path between the electrode pair (64, 65).

    As described above, the insulating casing (71) accommodates only one electrode (first electrode (64)) of the electrode pair (64, 65) inside, and the opening (74) as the current density concentration portion. ).

    In addition, in the opening (74) of the insulating casing (71), the current density of the current path increases, so that water is vaporized by Joule heat and bubbles (B) are formed. That is, the opening (74) of the insulating casing (71) functions as a gas phase forming part that forms bubbles (B) as a gas phase part in the opening (74).

    Further, as shown in FIG. 2, the ultrasonic generator (94) includes a plate-shaped piezoelectric ceramic (95) and a pair of metal plates (96a, 96b) provided so as to sandwich the piezoelectric ceramic (95) therebetween. ). The case (97) enclosing the ultrasonic wave generation unit (94) is sealed and disposed at the bottom of the storage tank (11).

    The metal plate (96a, 96b) is supplied with the output signal (AC voltage) of the ultrasonic waveform generator (8) amplified by the amplifier (9). Thereby, an ultrasonic wave generation part (94) irradiates the ultrasonic wave of arbitrary frequencies in a container (61). However, in order to decompose hydrogen peroxide and efficiently generate hydroxyl radicals, it is particularly preferable if the frequency of the ultrasonic wave is about 100 kHz or more.

    In addition, the ultrasonic wave generation unit (94) may be installed at an arbitrary position within a range where ultrasonic waves can be applied to the stored water in the storage tank (11). For example, as shown to Fig.4 (a), the ultrasonic generation part (94) may be installed in the bottom outer side of the storage tank (11). When the ultrasonic generator (94) is installed outside the bottom of the storage tank (11), the ultrasonic waves are transmitted to the stored water via the wall surface of the storage tank (11).

    Moreover, the structure of an ultrasonic wave generation part (94) is not restricted to the example shown in FIG. For example, as shown in FIG. 4B, a plate-like piezoelectric ceramic (95) is sandwiched between the upper part of the metal case (97A) and the metal plate (96), and an AC voltage is supplied between the two. May be.

-Purification operation of the water purification unit (10)-
Next, the purification operation of the water purification unit (10) will be described.

    First, rainwater (22) flows from the roof of the house (20) through the gutter (21), is guided to the storage tank (11), and is stored in the storage tank (11). On the other hand, when the water purification unit (10) is operated, the stored water as the rainwater (22) stored in the storage tank (11) is purified.

    Specifically, at the start of operation of the water purification unit (10), as shown in FIG. 2, the space (S) in the insulating casing (71) is in a flooded state. When a predetermined DC voltage (for example, 5 kV) is applied to the electrode pair (64, 65) from the high voltage generator (70), an electric field is formed between the electrode pair (64, 65). The periphery of the first electrode (64) is covered with an insulating casing (71). For this reason, the leakage current between the electrode pair (64, 65) is suppressed, and the current density of the current path in the opening (74) is increased.

    As the current density in the opening (74) increases, the Joule heat in the opening (74) increases. As a result, in the insulating casing (71), the vaporization of water is promoted in the vicinity of the opening (74) to form bubbles (B). As shown in FIG. 5, the bubble (B) covers almost the entire area of the opening (74), and water on the negative electrode side conducting to the second electrode (65) and the first electrode (64) on the positive electrode side. Air bubbles (B) are interposed between Therefore, in this state, the bubble (B) functions as a resistance that prevents conduction through water between the first electrode (64) and the second electrode (65). Thereby, the leakage current between the first electrode (64) and the second electrode (65) is suppressed, and a desired potential difference is maintained between the electrode pair (64, 65). Then, in the bubble (B), discharge is generated due to dielectric breakdown.

    As described above, when discharge is performed with the bubbles (B), active species such as hydroxyl radicals, hydrogen peroxide, and the like are generated in the water in the storage tank (11). In particular, since the discharge unit (62) is provided at the bottom of the storage tank (11), active species such as hydroxyl radicals and hydrogen peroxide are convected in the storage tank (11) by heat associated with discharge. . This convection promotes the diffusion of active species and hydrogen peroxide in water. Further, when the discharge is performed with the bubbles (B), an ion wind is easily generated with the bubbles (B) along with the discharge. Therefore, in the storage tank (11), the diffusion effect of active species and hydrogen peroxide is further improved by using this ion wind.

    Further, when the soot (21) is formed of copper, the storage tank (11) is supplied with copper ions eluted from the soot (21). In the presence of hydrogen peroxide and copper ions, copper ions act catalytically by the Fenton reaction to promote the generation of hydroxyl radicals. Thereby, the purification efficiency of the water by a hydroxyl radical improves. In addition, since copper ions have the effect of suppressing the growth of bacteria, the bactericidal action in water also increases.

    As described above, active species such as hydroxyl radicals diffused in water are used to purify water by oxidizing and decomposing components to be treated (for example, ammonia) contained in water. In addition, hydrogen peroxide diffused in water is used for water sterilization.

    The purified water generated in the storage tank (11) is supplied to a predetermined location such as a toilet by a water pump (13) through a water pipe (12).

    FIG. 6 is a diagram showing a basic cycle of purification processing by the water purification unit (10) of the present embodiment. As shown in the figure, the liquid such as water stored in the storage tank (11) is first purified by the discharge generated between the electrode pair (64, 65). At this time, active species such as hydroxyl radicals are generated in the stored water by discharge, and organic substances are decomposed or sterilized (steps St1 and St2 in FIG. 6). Hydroxyl radicals change to hydrogen peroxide in a short time (step St3).

    Next, an ultrasonic wave is propagated from the ultrasonic wave generation unit (94) to the stored water in the storage tank (11), hydrogen peroxide in the stored water is decomposed, and converted into hydroxyl radicals (step St4). Hydroxyl radicals generated by ultrasonic irradiation are changed to hydrogen peroxide again. However, since the hydroxyl radicals used to purify the stored water, such as sterilization, change to water, the concentration of hydrogen peroxide decreases when the discharge is stopped and only ultrasonic irradiation is performed. It will be.

    Next, a specific example of operation control of the water purification unit (10) of the present embodiment combining discharge and ultrasonic treatment will be described. FIG. 7 is a time chart showing an example of operation control when feedback control is performed using the hydrogen peroxide concentration of the stored water in the storage tank (11). In the following method, hydrogen peroxide in the stored water in the storage tank (11) is detected by the sensor (7).

    In this method, first, the operation is started in a state where the stored water is accumulated in the storage tank (11). The controller (1) applies a predetermined voltage between the electrode pair (64, 65) to cause discharge. At this time, the ultrasonic wave generator (94) is turned off. Thereby, the stored water is purified and the hydrogen peroxide concentration of the stored water is increased.

    Next, when the hydrogen peroxide concentration in the storage water in the storage tank (11) exceeds a preset lower limit, the control unit (1) continues the voltage supply to the electrode pair (64, 65) and performs control. The unit (5) turns on the ultrasonic wave generation unit (94) to irradiate the stored water with ultrasonic waves. Thus, the stored water is purified by the hydroxyl radicals generated by the discharge and the hydroxyl radicals generated from the hydrogen peroxide. Since the amount of hydrogen peroxide generated by the discharge is larger than the amount of hydrogen peroxide decomposed by the ultrasonic wave, the concentration of hydrogen peroxide in the stored water increases during this period.

    Next, when the hydrogen peroxide concentration in the stored water in the storage tank (11) exceeds the preset upper limit, the control unit (1) stops the voltage supply to the electrode pair (64, 65) and discharges it. Stop. The controller (5) continues to turn on the ultrasonic generator (94) to irradiate the stored water with ultrasonic waves. Thereby, the stored water is purified by the hydroxyl radicals generated from hydrogen peroxide. During this period, since the hydrogen peroxide is decomposed by ultrasonic waves, the concentration of hydrogen peroxide in the stored water decreases.

    Next, when the hydrogen peroxide concentration of the stored water in the storage tank (11) falls below the lower limit, the control unit (1) resumes the voltage supply to the electrode pair (64, 65). Thereby, the hydrogen peroxide concentration of stored water rises again. Thereafter, by repeating the period in which only the ultrasonic irradiation is performed and the period in which the ultrasonic irradiation and the discharge are combined, the hydrogen peroxide concentration of the stored water is controlled to the range of the lower limit value and the upper limit value. , Purify the stored water.

-Effect of Embodiment 1-
As described above, according to the first embodiment, since the discharge is caused in the water of the stored water to generate the hydroxyl radical, the rainwater (22) can be purified reliably.

    In particular, since a hydroxyl radical is generated by discharge, it is not necessary to use clean water or salt as compared with the case of purifying rainwater (22) using electrolysis, and a discharge unit (62) that simply causes discharge. And the rainwater (22) can be reliably purified by providing the ultrasonic wave generation part (94) for decomposing hydrogen peroxide. As a result, in this embodiment, since it is not necessary to provide a device for supplying clean water or salt, the configuration can be simplified and the device itself can be downsized.

    In addition, since the discharge unit (62) is provided at the bottom of the storage tank (11), active species such as hydroxyl radicals and hydrogen peroxide convect in the storage tank (11) by heat accompanying discharge. This convection promotes diffusion of active species such as hydroxyl radicals and hydrogen peroxide in water. As a result, the entire stored water in the storage tank (11) is reliably purified.

    Moreover, since the water supply pipe (12) is connected to the said storage tank (11), purified water can be reliably supplied to a toilet etc.

    In the above method, the control unit (1) generates a hydroxyl radical by generating discharge until the hydrogen peroxide concentration in the storage tank (11) reaches the upper limit after the operation starts, and the storage tank (11) The inside can be purified. Further, the control unit (5) turns on the ultrasonic wave generation unit (94) during a period in which the hydrogen peroxide concentration in the storage tank (11) exceeds a predetermined lower limit, in other words, the hydrogen peroxide concentration The ultrasonic wave generation unit (94) is turned off during the period when the value is lower than the predetermined lower limit. That is, when sufficient hydrogen peroxide is present in the storage tank (11), the hydroxyl radicals are generated by ultrasonic waves, so that the inside of the storage tank (11) can be effectively purified. Furthermore, by continuously irradiating with ultrasonic waves in the presence of a sufficient concentration of hydrogen peroxide, hydroxyl radicals can be continuously generated, so that a strong purification ability can be maintained for a predetermined period. it can.

    Furthermore, according to the above-described method, the concentration of hydrogen peroxide in the stored water supplied from the storage tank (11) to the water pipe (12) can be suppressed to the upper limit value or less, so that the hydrogen peroxide is removed. Can be facilitated.

    According to the water purification unit (10) of the present embodiment, as described above, the purification capability is improved without increasing the concentration of hydrogen peroxide in the storage tank (11) by combining discharge and ultrasonic irradiation. Can be achieved.

    In the case of continuously treating the stored water, as shown in FIG. 2, the ultrasonic generator (94) is disposed closer to the water pipe (12) than the electrode pair (64, 65), thereby causing discharge. Hydroxyl radicals can be effectively generated from the generated hydrogen peroxide by ultrasonic irradiation.

    Moreover, in FIG. 2, the control part (1) which controls ON / OFF of the voltage applied to an electrode pair (64,65), and the control part (5) which controls operation | movement of an ultrasonic wave generation part (94) are included. Although provided separately, it is also possible to control the on / off of the voltage applied to the electrode pair (64, 65) and the operation of the ultrasonic wave generator (94) by one control unit.

    In the water purification unit (10) of the present embodiment, bacteria and the like that propagate in the storage tank (11) are effectively sterilized simultaneously with the purification process of the stored water by the hydroxyl radical generated by the discharge and ultrasonic irradiation. You can also.

<Modification 1 of Embodiment 1>
In the first embodiment, one opening (74) is formed in the lid (73) of the insulating casing (71). However, for example, as shown in FIGS. 8 and 9, a plurality of openings (74) may be formed in the lid portion (73) of the insulating casing (71). In this modification, the lid portion (73) of the insulating casing (71) is formed in a substantially square plate shape, and a plurality of openings (74) are arranged in a grid pattern in the lid portion (73) at regular intervals. Has been. On the other hand, the first electrode (64) and the second electrode (65) are formed in a square plate shape so as to straddle all the openings (74).

    Also in this modification, each opening (74) functions as a current density concentration part and a gas phase formation part. As a result, when a DC voltage is applied from the high voltage generator (70) to the electrode pair (64, 65), the current density of each opening (74) increases, and bubbles (B) are formed in each opening (74). It is formed. As a result, an electric discharge is generated in each bubble (B), and active species such as hydroxyl radicals and hydrogen peroxide are generated.

<Modification 2 of Embodiment 1>
Hereinafter, modified examples of the operation of the water purification unit (10) of Embodiment 1 will be described.

    FIG. 10 is a time chart showing an example of operation control in the case where feedforward control is performed using the measured value of the change in the concentration of hydrogen peroxide.

    The water purification unit (10) used here is not necessarily provided with the sensor (7). However, when only the discharge is performed, the time T1 required for the hydrogen peroxide concentration of the stored water in the storage tank (11) to reach the lower limit from 0, the stored water when the discharge and the ultrasonic irradiation are performed simultaneously. The time T2 required for the hydrogen peroxide concentration of the water to reach the upper limit from the lower limit, and the time T3 required for the hydrogen peroxide concentration of the stored water to reach the lower limit from the upper limit when only ultrasonic irradiation is performed, Each is measured in advance, and the measurement data is stored in a memory (not shown) provided inside or outside the control unit (1, 5). The control unit (1, 5) performs the following control based on the measurement data. A timer for counting time is provided inside or outside the control unit (1, 5).

    In the method according to this modification, first, the control unit (1) applies a predetermined voltage between the electrode pair (64, 65) to cause discharge. At this time, the ultrasonic wave generator (94) is turned off. Thereby, the stored water is purified, and the concentration of hydrogen peroxide in the stored water increases.

    Next, when time T1 elapses from the start of operation, the control unit (1) continues to supply voltage to the electrode pair (64, 65), and the control unit (5) turns on the ultrasonic wave generation unit (94). The stored water is irradiated with ultrasonic waves. Thus, the stored water is purified by the hydroxyl radicals generated by the discharge and the hydroxyl radicals generated from the hydrogen peroxide. During this period, the concentration of hydrogen peroxide in the stored water also increases.

    Next, when the time T2 has elapsed, the control unit (1) stops the voltage supply to the electrode pair (64, 65) and stops the discharge. The controller (5) continues to turn on the ultrasonic generator (94) to irradiate the stored water with ultrasonic waves. Thereby, the stored water is purified by the hydroxyl radicals generated from hydrogen peroxide. During this period, the concentration of hydrogen peroxide in the stored water decreases.

    Next, when the time T3 further elapses, the control unit (1) resumes the voltage supply to the electrode pair (64, 65) and continues this state for the time T2. Thereby, the concentration of hydrogen peroxide in the stored water rises again. Thereafter, similarly, by repeating a period in which only the ultrasonic irradiation is performed (time T3) and a period in which the ultrasonic irradiation and the discharge are combined (time T2), the hydrogen peroxide concentration of the stored water is set to the lower limit value and the upper limit value. The stored water is purified while controlling to the following range.

    Also by the above method, it is possible to purify the stored water while controlling the concentration of hydrogen peroxide in the stored water within the range of the lower limit value or more and the upper limit value or less. This is a modification of the operation, and the stored water can be purified by other methods.

<Embodiment 2 of the invention>
The water purification unit (10) according to the second embodiment is different from the first embodiment described above in the configuration of the discharge unit (62). In the following, differences from the first embodiment will be mainly described.

    As shown in FIG. 11, the discharge unit (62) of the second embodiment is configured as a so-called flange unit type that is inserted and fixed from the outside to the inside of the storage tank (11). In the discharge unit (62) of the second embodiment, the first electrode (64), the second electrode (65), and the insulating casing (71) are integrally assembled.

    The insulating casing (71) has a substantially outer shape that is cylindrical. The insulating casing (71) has a case body (72) and a lid (73).

    The case body (72) is made of an insulating material made of glass or resin. The case body (72) includes a cylindrical base portion (76), a cylindrical wall portion (77) projecting from the base portion (76) toward the storage tank (11), and the cylindrical wall portion (77). And an annular convex part (78) projecting further toward the storage tank (11) side. The case body (72) is integrally formed with a distal end cylindrical portion (79) on the distal end side of the annular convex portion (78). A cylindrical insertion port (76a) is formed in the axial center portion of the base portion (76) so as to extend in the axial direction. A cylindrical space (S) that is coaxial with the insertion port (76a) and has a larger diameter than the insertion port (76a) is formed inside the cylindrical wall (77).

    The said cover part (73) is formed in the substantially disc shape, and is fitted inside the annular convex part (78). The lid (73) is made of a ceramic material. As in the first embodiment, one circular opening (74) penetrating the lid (73) up and down is formed at the axis of the lid (73).

    The first electrode (64) is a vertically long rod-shaped electrode having a circular cross section perpendicular to the axis. The first electrode (64) is fitted in the insertion opening (76a) of the base (76). Thereby, the first electrode (64) is accommodated in the insulating casing (71). In the second embodiment, the end of the first electrode (64) opposite to the storage tank (11) is exposed to the outside of the storage tank (11). For this reason, the high voltage generation part (70) arrange | positioned outside the storage tank (11) and the 1st electrode (64) can be easily connected by electrical wiring.

    The end (64a) on the storage tank (11) side of the first electrode (64) faces the space (S) inside the insulating casing (71). In the example shown in FIG. 11, the end portion (64a) of the first electrode (64) protrudes above the opening surface of the insertion port (76a) (on the storage tank (11) side). The tip surface of the end portion (64a) may be substantially flush with the opening surface of the insertion port (76a), or the end portion (64a) may be recessed below the opening surface of the insertion port (76a). . Further, as in the first embodiment, the first electrode (64) has a predetermined interval between the first electrode (64) and the lid (73) having the opening (74).

    The second electrode (65) has a cylindrical electrode body (65a) and a flange (65b) projecting radially outward from the electrode body (65a). The electrode body (65a) is externally fitted to the case body (72) of the insulating casing (71). The flange part (65b) constitutes a fixed part that is fixed to the wall part of the storage tank (11) and holds the discharge unit (62). In a state where the discharge unit (62) is fixed to the storage tank (11), a part of the electrode body (65a) of the second electrode (65) is immersed.

    The second electrode (65) includes an inner cylindrical portion (65c) having a smaller diameter than the electrode main body (65a) and a connecting portion formed between the inner cylindrical portion (65c) and the electrode main body (65a). (65d). The inner cylinder part (65c) and the connecting part (65d) are immersed in the water in the storage tank (11). The inner cylinder part (65c) forms the cylindrical space (67) in the inside. One end of the inner cylinder portion (65c) in the axial direction constitutes a holding portion that contacts the lid portion (73) and holds the lid portion (73). Further, the tip cylinder part (79) of the case body (72) is fitted between the electrode body (65a), the inner cylinder part (65c), and the connecting part (65d). On the other end side in the axial direction of the inner cylinder portion (65c), a mesh-shaped leakage preventing material (68) is provided so as to cover the cylindrical space (67). The leakage preventing material (68) is substantially grounded by being in contact with the second electrode (65). Thereby, the leakage preventive material (68) prevents leakage from the inside to the outside of the cylindrical space (67) in the space (underwater) inside the storage tank (11).

    The second electrode (65) is in a state in which a part of the electrode body (65a) is exposed to the outside of the storage tank (11). For this reason, the high voltage generation part (70) and the second electrode (65) can be easily connected by the electric wiring. Other configurations are the same as those of the first embodiment.

-Operation of water purification unit-
Also in Embodiment 2, the water purification unit (10) is operated to purify the water flowing through the water pipe (12).

    At the start of operation of the water purification unit (10), as shown in FIG. 11, the space (S) in the insulating casing (71) is in a flooded state. When a predetermined DC voltage (for example, 1 kV) is applied from the high voltage generator (70) to the electrode pair (64, 65), the current density inside the opening (74) increases.

    When a DC voltage is continuously applied to the electrode pair (64, 65) from the state shown in FIG. 11, water in the opening (74) is vaporized to form bubbles (B) (see FIG. 12). reference). In this state, the bubble (B) covers almost the entire area of the opening (74), and the resistance due to the bubble (B) is between the negative electrode water in the cylindrical space (67) and the first electrode (64). Is granted. As a result, the potential difference between the first electrode (64) and the second electrode (65) is maintained, and discharge occurs in the bubbles (B). As a result, hydroxyl radicals and hydrogen peroxide are generated in water, and these components are used for water purification. Other operations and effects are the same as those of the first embodiment.

<Modification of Embodiment 2>
In the second embodiment, one opening (74) is formed in the axis of the disc-shaped lid (73). However, even if a plurality of openings (74) are formed in the lid (73). Good. In the example shown in FIG. 13, five openings (74) are arranged at equal intervals on a virtual pitch circle centered on the axis of the lid (73). Thus, by forming a plurality of openings (74) in the lid part (73), it is possible to cause a discharge in the vicinity of each opening (74).

Embodiment 3 of the Invention
FIG. 14 is a configuration diagram illustrating a water purification unit (10) according to the third embodiment of the present invention. In the same figure, the same code | symbol as FIG. 2 is attached | subjected about the structure similar to the water purification unit (10) of Embodiment 1. FIG. Further, the discharge waveform generation unit (3), the control unit (1,5), the amplifier (9), and the sensor (7) are omitted in FIG. 14, but actually, the water purification unit of the present embodiment. (10) is provided. Below, a different point from the water purification unit (10) of Embodiment 1 is mainly demonstrated.

    The water purification unit (10) of the present embodiment includes a storage tank (11), an electrode pair (64A, 65A) disposed in the storage tank (11), and a height connected to the electrode pair (64A, 65A). A voltage generation unit (power supply unit) (70A) and an ultrasonic generation unit (94) installed at the bottom of the storage tank (11) are provided.

    The electrode (64A) is housed inside the insulating casing (71A), and the electrode (65A) is housed inside the insulating casing (71B). The electrode (64A) and the electrode (65A) are each formed in a flat plate shape. The electrode (64A) and the electrode (65A) are made of a conductive metal material having high corrosion resistance. The high voltage generator (70A) supplies a voltage of several kilovolts to the electrode pair (64A, 65A).

    The insulating casings (71A, 71B) are made of an insulating material such as ceramics and have the same configuration as the insulating casing (71) shown in FIG.

    That is, the insulating casing (71A) includes a container-like case main body (180A) whose one surface (the right-hand surface in FIG. 14) is opened, and a plate-like lid portion that closes the open portion of the case main body (180A). (73A). The insulating casing (71B) includes a container-like case body (180B) whose one surface (left surface in FIG. 14) is opened, and a plate-like lid portion that closes the open portion of the case body (180B). (73B).

    One opening (74A) that penetrates the lid (73A) in the thickness direction is formed in the lid (73A) of the insulating casing (71A). One opening (74B) penetrating the lid (73B) in the thickness direction is also formed in the lid (73B) of the insulating casing (71B). These openings (74A, 74B) allow formation of an electric field between the electrode (64A) and the electrode (65A). The inner diameter of the openings (74A, 74B) is preferably 0.02 mm or more and 0.5 mm or less. The openings (74A, 74B) as described above constitute a current density concentration portion that increases the current density of the current path between the electrode pair (64A, 65A).

    The insulating casings (71A, 71B) are installed on the side surfaces facing each other in the storage tank (11) so that the lid portions (73A, 73B) face each other. In other words, the electrode (64A) and the electrode (65A) are arranged to face each other.

    In the openings (74A, 74B) of the insulating casings (71A, 71B), the current density in the current path increases, so that the liquid is vaporized by Joule heat and bubbles are formed. That is, the opening (74A, 74B) of the insulating casing (71A, 71B) functions as a gas phase forming part that forms bubbles as a gas phase part in the opening (74A, 74B). With this configuration, when a voltage is supplied to the electrode pair (64A, 65A), discharge can be generated in the bubbles between the electrode pair (64A, 65A).

    The specific configuration of the ultrasonic generator (94) is the same as that of the purification device according to the first embodiment.

    By operating the purification apparatus of the present embodiment by the method shown in FIG. 7 or FIG. 10, the liquid in the storage tank (11) is effectively maintained while the concentration of hydrogen peroxide in the stored water is maintained within a predetermined range. Can be purified.

<Embodiment 4 of the Invention>
FIG. 15: is a block diagram which shows the water purification unit (10) of Embodiment 4 of this invention. In the same figure, the same code | symbol as FIG. 2 is attached | subjected about the structure similar to the water purification unit (10) of Embodiment 1. FIG. Further, the discharge waveform generator (3), the controller (1,5), the amplifier (9), and the sensor (7) are not shown in FIG. 15, but actually, the water purification unit of the present embodiment. (10) is provided. Below, a different point from the water purification unit (10) of Embodiment 1 is mainly demonstrated.

    The water purification unit (10) of the present embodiment includes a storage tank (11), an electrode pair (64B, 65B) disposed in the storage tank (11), and a height connected to the electrode pair (64B, 65B). A voltage generation unit (power supply unit) (70B) and an ultrasonic generation unit (94) installed at the bottom of the storage tank (11) are provided.

    In the water purification unit (10) of the present embodiment, the first electrode (64B) and the second electrode (65B) are respectively connected to the positive electrode side and the negative electrode side of the high voltage generator (70B), and the high voltage generator A high pulse voltage is supplied from (70B) to the electrode pair (64B, 65B).

    Further, the insulating casing (71) surrounding the first electrode (64B) is not provided. The first electrode (64B) and the second electrode (65B) are both plate-shaped and are installed on the side surfaces in the storage tank (11) so as to face each other.

    Furthermore, the water purification unit (10) of the present embodiment includes at least a position between the electrode pair (64B, 65B) and lower than the electrode pair (64B, 65B), such as the bottom of the storage tank (11). There are provided a nozzle (discharge means) (119) and an air pump (delivery means) (99) for sending a gas such as air to the nozzle (119). The gas in the storage tank (11) is circulated through the nozzle (119) by the air pump (99). However, gas may be supplied from the outside into the storage tank (11) by the air pump (99).

    The configuration of the ultrasonic generator (94) is the same as that of the first embodiment, and may be installed at the bottom of the storage tank (11), but the liquid in the storage tank (11) (41) is irradiated with ultrasonic waves. It can be installed at any position as much as possible.

    Bubbles are discharged from the nozzle (119) into the stored water at least during the discharge treatment. By supplying a pulse voltage to the electrode pair (64B, 65B) in a state where bubbles are present in the stored water, a discharge is generated inside the bubbles and hydroxyl radicals are generated.

    In the water purification unit (10) of the present embodiment, liquid purification that combines discharge and ultrasonic irradiation is performed by basically the same method as that of the first embodiment, that is, the method shown in FIG. However, during the discharge process shown in FIG. 7 or FIG. 10, pulse voltage is intermittently supplied from the high voltage generator (70B) to the electrode pair (64B, 65B), and between the electrode pair (64B, 65B). Discharge occurs intermittently.

    According to the above configuration and method, hydroxyl radicals can be generated efficiently even when pulse discharge is generated between the electrode pair (64B, 65B). High purification ability can be exhibited without raising

<Embodiment 5 of the Invention>
FIG. 16: is a block diagram which shows the water purification unit (10) of Embodiment 5 of this invention. In the same figure, the same code | symbol as FIG. 2 is attached | subjected about the structure similar to the water purification unit (10) of Embodiment 1. FIG. Further, the discharge waveform generator (3), the controller (1,5), the amplifier (9), and the sensor (7) are not shown in FIG. 16, but actually, the water purification unit of the present embodiment. (10) is provided. Below, a different point from the water purification unit (10) of Embodiment 1 is mainly demonstrated.

    The water purification unit (10) of this embodiment includes a storage tank (11), an electrode pair (64C, 65C) disposed in the storage tank (11), and a high electrode connected to the electrode pair (64C, 65C). A voltage generation unit (power supply unit) (70C) and an ultrasonic generation unit (94) installed at the bottom of the storage tank (11) are provided.

    The electrode (64C) and the electrode (65C) are respectively installed on the side surfaces in the storage tank (11) so as to face each other.

    The electrode (64C) has at least one conductive part (164) and an insulating part (165) surrounding the conductive part (164).

    The electrode (65C) has at least one conductive part (166) and an insulating part (167) surrounding the conductive part (166).

    As described above, since the area of the exposed surface of the conductive portion (164) in the electrode (64C) and the exposed surface of the conductive portion (166) in the electrode (65C) is small, voltage is supplied to the electrode pair (64C, 65C). In this case, a concentrated portion of current density is formed on the surface of the conductive portion (164, 166). Therefore, on the surface of the conductive portion (164, 166), the liquid is vaporized by Joule heat to form bubbles. By continuing the voltage supply from the high voltage generator (70C) with the exposed surfaces of the conductive portions (164, 166) covered by the bubbles, a discharge is generated inside the bubbles.

    The specific configuration of the ultrasonic wave generator (94) is the same as that of the first embodiment.

    By operating the water purification unit (10) of this embodiment by the method shown in FIG. 7 or FIG. 10, while maintaining the concentration of hydrogen peroxide in the stored water within a predetermined range, The liquid can be effectively purified.

    Even with the above configuration, by combining discharge between the electrode pair (64B, 65B) and ultrasonic irradiation, high purification ability can be exhibited without increasing the hydrogen peroxide concentration.

<Other embodiments>
About the said embodiment, it is good also as the following structures.

    Although each said embodiment demonstrated purification of rainwater (22), you may apply this invention to purification of well water other than rainwater (22).

    In addition, the above embodiment is an essentially preferable illustration, Comprising: It does not intend restrict | limiting the range of this invention, its application thing, or its use. Moreover, in the above embodiment, the shape of each member, arrangement | positioning, material, etc., or the operation | movement method of a purification apparatus can be suitably changed in the range which does not deviate from the meaning of this invention.

    As described above, the present invention is useful for a water recycling apparatus that purifies rainwater or well water.

DESCRIPTION OF SYMBOLS 1, 5 Control part 3 Discharge waveform generation part 7 Sensor 8 Ultrasonic waveform generation part 9 Amplifier 10 Water purification unit (water reuse apparatus)
DESCRIPTION OF SYMBOLS 11 Storage tank 12 Water pipe 13 Water pump 20 House 21 樋 22 Rain water 62 Discharge unit 64, 64A, 64B, 64C 1st electrode (electrode pair)
65, 65A, 65B, 65C Second electrode (electrode pair)
70, 70A, 70B, 70C Power supply (DC power supply high voltage generator)
94 Ultrasonic generator 99 Air pump 119 Nozzle

Claims (10)

A storage tank (11) for storing rainwater or well water;
An electrode pair (64, 64A, 64B, 64C, 65, 65A, 65B, 65C) provided in the storage tank (11) and causing discharge in the stored water in the storage tank (11), and the electrode pair ( 64, 64A, 64B, 64C, 65, 65A, 65B, 65C) and a power source (70, 70A, 70B, 70C) for applying voltage to the above discharge to generate hydroxyl radicals in the stored water. A discharge unit (62) for purifying the stored water;
A water recycling apparatus comprising: an ultrasonic wave generation unit (94) that decomposes hydrogen peroxide generated in the stored water into hydroxyl radicals by applying ultrasonic waves. In claim 1,
The water recycling apparatus, wherein the discharge unit (62) is provided at a bottom portion inside the storage tank (11). In claim 1 or 2,
A first controller (1) for controlling on or off of a voltage applied to the electrode pair (64, 64A, 64B, 64C, 65, 65A, 65B, 65C);
A second controller (5) for controlling the operation of the ultrasonic generator (94),
The first control unit (1) and the second control unit (5) are arranged so that the concentration of hydrogen peroxide contained in the stored water does not exceed a predetermined upper limit value (64, 64A, 64B). , 64C, 65, 65A, 65B, 65C), a water recycling apparatus, which controls on / off of the voltage applied to each other and the operation of the ultrasonic generator (94). In claim 3,
A sensor (7) for monitoring the concentration of hydrogen peroxide contained in the stored water;
The first control unit (1) turns on or off the voltage applied to the electrode pair (64, 64A, 64B, 64C, 65, 65A, 65B, 65C) according to the monitoring result by the sensor (7). Control
The water recycling apparatus, wherein the second control unit (5) controls the operation of the ultrasonic wave generation unit (94) according to a monitoring result by the sensor (7). In claim 4,
When at least the concentration of hydrogen peroxide in the stored water exceeds the upper limit value, the first control unit (1) causes the electrode pair (64, 64A, 64B, 64C, 65, 65A, 65B, 65C ) To turn off the voltage applied to stop the discharge, and the second control unit (5) operates the ultrasonic wave generation unit (94). In any one of claims 3 to 5,
The second control unit (5) turns on the ultrasonic wave generation unit (94) during a period in which the concentration of hydrogen peroxide contained in the stored water exceeds a predetermined lower limit value lower than the upper limit value. Water reuse device characterized by. In claim 1 or 2,
A controller that controls on / off of the voltage applied to the electrode pairs (64, 64A, 64B, 64C, 65, 65A, 65B, 65C) and the operation of the ultrasonic generator (94); Prepared,
The control unit applies to the electrode pairs (64, 64A, 64B, 64C, 65, 65A, 65B, 65C) so that the concentration of hydrogen peroxide contained in the stored water does not exceed a predetermined upper limit value. A water recycling apparatus for controlling on / off of voltage and operation of the ultrasonic wave generation unit (94). In claim 7,
The controller applies to the electrode pair (64, 64A, 64B, 64C, 65, 65A, 65B, 65C) when the concentration of hydrogen peroxide contained in the stored water exceeds a predetermined upper limit value. The discharge is stopped by turning off the voltage to turn on the ultrasonic generator (94) during a period in which the concentration of hydrogen peroxide contained in the stored water exceeds a predetermined lower limit lower than the upper limit. A water recycling apparatus characterized by: In any one of Claims 1 thru | or 8,
A discharge means (119) for discharging bubbles into the stored water;
A delivery means (99) for sending gas to the discharge means (119);
The electrode pair (64B, 65B) has a plate shape and is disposed so as to face each other.
The power source (70B) applies a pulse voltage to the electrode pair (64B, 65B),
The water recycling apparatus, wherein the discharge means (119) is disposed between the electrode pair (64B, 65B) and at the bottom of the storage tank (11). In any one of Claims 1 thru | or 9,
The storage tank (11) is connected to an introduction pipe (21) for guiding rainwater and to a water supply pipe (12) for supplying the stored water purified by the discharge unit (62) to a predetermined location. A water recycling apparatus characterized by comprising:

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