JP2015054278A - Water treatment apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently treat water to be treated by hydroxy radicals.SOLUTION: A water treatment apparatus for treating water to be treated includes a passage (30) through which the water to be treated flows, electric discharge means (50) which generates a discharge reaction in gas introduced into the passage (30), atomizing means (60) which atomizes bubbles (B) formed by the introduction of the gas into the passage (30), and agitating means (70) which agitates fine bubbles (b) atomized by the atomizing means (60).

Description

  The present invention relates to a water treatment apparatus for treating various types of water.

  Conventionally, a water treatment apparatus that treats water to be treated such as ballast water with ozone is known. In such a water treatment apparatus, various developments have been made in order to improve or stabilize the treatment efficiency of water to be treated.

  For example, Patent Document 1 discloses a water distribution pipe, a screw propeller that forms a swirling flow in the water to be treated which has flowed into the water distribution pipe, an ozone injection pipe for injecting ozone into the water to be treated, and an inner surface of the water distribution pipe. Disclosed is a water treatment device comprising a mounted turbulent flow generation means. Ozone is injected from the ozone injection pipe into the swirling flow formed by the screw propeller. The turbulent flow generation means is provided on the downstream side of the tip of the ozone injection pipe. For this reason, the bubbles of ozone supplied from the ozone injection pipe into the water to be treated are first stirred by the swirling flow and then refined by colliding with the turbulent flow generating means. The refined bubbles dissolve in the water to be treated, so that the water to be treated (e.g., sterilization of the water to be treated and killing microorganisms) is efficiently performed.

JP 2006-239601 A

  In the water treatment apparatus of Patent Document 1, the water to be treated is effectively treated with the finely divided ozone bubbles.

  Here, in order to further improve the treatment efficiency of the water to be treated, it is conceivable to treat the water to be treated using a hydroxy radical having an oxidation energy larger than the oxidation energy of ozone instead of ozone.

  However, since the reaction rate of hydroxy radicals is much faster than that of ozone, when bubbles containing hydroxy radicals are injected into the water to be treated in the apparatus of Patent Document 1, the bubbles are stirred by a swirling flow. It is assumed that most of the hydroxyl radicals disappear during the course of the process or before being refined by the turbulent flow generating means.

  The object of the present invention is to treat treated water efficiently with hydroxy radicals.

  As means for solving the above-mentioned problems, the present invention is a water treatment apparatus for treating water to be treated, which causes a discharge reaction between a flow path through which the water to be treated flows and a gas introduced into the flow path. Water comprising: a discharging means; a refining means for refining bubbles formed by introducing the gas into the flow path; and a stirring means for stirring the microbubbles refined by the refining means. A processing device is provided.

  In the present invention, among the hydroxyl radicals (.OH) generated by a discharge reaction occurring in the gas introduced into the water to be treated, those present on the surface of the bubbles come into contact with the water to be treated. Water is processed. In the present invention, the bubbles are first refined by the refinement means and then stirred by the stirring means. That is, before the hydroxyl radical having a high reaction rate disappears, the bubbles containing the hydroxyl radical become a plurality of microbubbles, greatly increasing the total surface area, and the plurality of microbubbles are agitated. Therefore, the amount of water to be treated that comes into contact with the hydroxyl radicals is dramatically increased, so that it is possible to effectively treat the water to be treated with hydroxy radicals.

  Specifically, the finer means may include a divider having a cutter part for dividing the bubbles.

  In this embodiment, microbubbles can be obtained with a simple configuration.

  Or the said refinement | miniaturization means may also contain the pressurization pressure reduction device which decompresses, after pressurizing the said to-be-processed water containing the said bubble.

  Even in this embodiment, microbubbles can be obtained with a simple configuration.

  Moreover, in this invention, the said flow path has a cylindrical upstream part in which the said refinement | miniaturization means is provided, and a downstream part containing the cylindrical processing tank in which the said stirring means is provided, The said process tank The cross-sectional area of the surface orthogonal to the axial direction of the treatment tank is preferably larger than that of the upstream portion.

  If it does in this way, when the to-be-processed water will reach the processing tank of the downstream part in which the stirring means is provided from the upstream part in which the refinement | miniaturization means is provided, the flow rate of the to-be-processed water will fall. And since the several microbubble is stirred in the processing tank in which the flow velocity fell, the residence time in the processing tank of the said microbubble becomes long. The amount of water to be treated that comes into contact with hydroxy radicals in the treatment tank further increases, and the water to be treated that passes through the treatment tank is treated more efficiently.

  In the present invention, the discharge means includes a pair of electrodes and a power source for applying a voltage between the pair of electrodes, includes a gap between the pair of electrodes, and supplies the gas to the flow path. It is preferable to further include a passage to be introduced and a valve that is disposed in the passage and that prevents the inflow of the water to be treated from the flow path toward the discharge means.

  In this way, a reduction in discharge efficiency is prevented.

  In the present invention, it is preferable that at least an inner surface of the flow path is formed of a substance having a bond dissociation energy larger than an oxidation energy of hydroxy radical generated in the bubbles by the discharge reaction.

  In this way, since the hydroxyl radical does not react with the inner surface of the flow path, in other words, the oxidation energy of the hydroxy radical is used for the treatment of the water to be treated without being used for the oxidation of the inner surface of the flow path. In addition, both suppression of corrosion or deterioration of the inner surface of the flow path and improvement of the treatment efficiency of the water to be treated are achieved.

  As described above, according to the present invention, water to be treated can be efficiently treated with hydroxy radicals.

It is a figure which shows the outline of a structure of the water treatment apparatus of 1st embodiment of this invention. It is a graph which shows the relationship between the division | segmentation number of a bubble, and the surface area of the said bubble. It is a flowchart which shows the drive operation of the water treatment apparatus of FIG. It is a figure which shows the modification of the water treatment apparatus of FIG. It is a figure which shows the outline of a structure of the water treatment apparatus of 2nd embodiment of this invention. It is a flowchart which shows a part of drive operation of the water treatment apparatus of FIG. It is a figure which shows the modification of the water treatment apparatus of FIG. It is the figure which looked at the flow path from the upper part.

(First embodiment)
A water treatment apparatus 20 according to a first embodiment of the present invention will be described with reference to FIG. This water treatment device 20 is used for sterilization of water to be treated such as ballast water for ships, drainage at various factories and offices, water for water and sewage treatment plants, drinking water, and microorganisms in the water to be treated. It is an apparatus used for performing.

  As shown in FIG. 1, the water treatment device 20 refines the flow path 30 through which the water to be treated flows, the bubble supply means 40 that supplies bubbles into the flow path 30, the discharge means 50, and the bubbles B. A finer means 60 and a stirring means 70 for stirring the microbubbles b refined by the finer means 60 are provided. The right side of FIG. 1 is the upstream side of the flow path 30, and the left side of FIG. 1 is the downstream side of the flow path 30.

  The flow path 30 has an upstream portion 32 and a downstream portion 34 located on the downstream side of the upstream portion 32.

  The upstream portion 32 is a cylindrical pipe. The upstream portion 32 is arranged in such a posture that its axis is horizontal. However, the posture of the upstream portion 32 is not limited to this.

  The downstream portion 34 includes a cylindrical processing tank 34a. However, if the processing tank 34a is cylindrical, it will not be restricted to a cylindrical shape. The processing tank 34a is arranged in a posture (attitude parallel to the vertical direction) whose axis is orthogonal to the axis of the upstream portion 32. The upstream part 32 is connected to the lower part of the processing tank 34a. For this reason, the to-be-processed water which flowed into the processing tank 34a from the upstream part 32 flows in the said processing tank 34a toward the upper direction from the downward direction. The cross-sectional area of the surface of the processing tank 34a perpendicular to the axial direction of the processing tank 34a (in this embodiment, the inner diameter of the processing tank 34a may be set) is larger than that of the upstream portion 32. For this reason, the flow rate of the water to be treated in the treatment tank 34 a is smaller than that in the upstream portion 32.

  A pump 38 is provided in the upstream portion 32 of the flow path 30. The pump 38 sends the water to be treated from the upstream portion 32 to the downstream portion 34.

  The bubble supply means 40 includes a supply pipe 42 for supplying bubbles to the flow path 30, a pump 44 provided in the supply pipe 42, and an opening / closing valve 46 provided in the supply pipe 42.

  The supply pipe 42 is made of an insulating material. The supply pipe 42 includes a plurality (two in FIG. 1) of cylindrical portions 42a and a merging portion 42b that joins the spaces in the cylindrical portions 42a. One end of the merging portion 42 b is connected to an end portion on the downstream side (lower side in FIG. 1) of each cylindrical portion 42 a, and the other end is connected to the upstream portion 32. That is, the bubbles B are supplied into the water to be treated in the upstream portion 32 through the passages formed in the respective cylinder portions 42a and the merging portion 42b.

  The pump 44 sends a gas containing oxygen (for example, air) into the upstream portion 32 through the passage. In this embodiment, the pump 44 is provided in each cylinder part 42a.

  The on-off valve 46 is provided in the junction part 42 b of the supply pipe 42. The on-off valve 46 allows passage of gas when the valve is opened, while preventing passage of water to be treated when the valve is closed.

  In addition, since the supply pipe 42 has the junction part 42b, the single on-off valve 46 is provided in the junction part 42b irrespective of the number of the cylinder parts 42a.

  The discharging means 50 has a pair of electrodes 52 and a power source 54.

  The pair of electrodes 52 is composed of a bar-shaped or plate-shaped counter electrode facing each other in a state of being separated from each other. The pair of electrodes 52 is fixed to the inner peripheral surface of each cylindrical portion 42a, that is, a position sandwiching the passage. That is, the bubbles B are supplied from the pump 44 through the pair of electrodes 52 into the upstream portion 32. In the present embodiment, the pair of electrodes 52 is provided at the end portion on the downstream side (lower side in FIG. 1) of each cylindrical portion 42a. Note that one of the pair of electrodes 52 may be a cylindrical electrode, and the other may be a rod-shaped electrode disposed in a cylindrical electrode in a state of being separated from the cylindrical electrode. In this case, the cylindrical electrode is fixed to the inner peripheral surface of the cylindrical portion 42a.

  The power supply 54 applies a DC voltage that causes a plasma discharge reaction to the gas supplied between the pair of electrodes 52 to the pair of electrodes 52 via wiring. The voltage applied to the pair of electrodes 52 may be a pulse voltage.

  The miniaturization means 60 is provided in the upstream portion 32. More specifically, the finer means 60 is provided on the downstream side of the upstream portion 32 with respect to the portion where the merging portion 42b is connected. The micronization means 60 of the present embodiment is a divider having a drive shaft 62 and a cutter part 64 fixed to the drive shaft 62.

  The drive shaft 62 has a first shaft portion 62a that penetrates the upstream portion 32, and a second shaft portion 62b that is connected to the first shaft portion 62a via a gear (not shown). The first shaft portion 62a is connected to an electric motor 65 provided outside the flow path 30, and is rotationally driven by this. The driving force of the first shaft portion 62a is transmitted to the second shaft portion 62b via a gear. The 2nd axial part 62b is arrange | positioned with the attitude | position extended in the horizontal direction parallel to the axial direction (flow direction of to-be-processed water) of the upstream part 32. As shown in FIG.

  The cutter part 64 is fixed to the second shaft part 62b. The cutter part 64 has a shape that is long in the direction orthogonal to the second shaft part 62b and gradually decreases in thickness toward the tip. The cutter unit 64 divides the bubble B with the rotation of the drive shaft 62. Thereby, the bubbles B become a plurality of micro bubbles b having a diameter smaller than the diameter of the bubbles B. As a result, the total surface area of the bubbles increases.

  Here, the relationship between the number of bubbles divided and the total surface area will be described with reference to FIG. As shown in FIG. 2, the total surface area of the bubbles increases as the number of bubble divisions increases. However, the total volume of the bubbles is constant. For example, if the bubble is divided into 1000 so that the diameter of the bubble is 1/10, the total surface area of the bubbles is 10 times that before the division.

  As shown in FIG. 1, the stirring means 70 is provided in the processing tank 34 a in the flow path 30. The stirring means 70 has a drive shaft 72 and a stirring blade 74 fixed to the drive shaft 72.

  The drive shaft 72 passes through the downstream portion 34. The drive shaft 72 is connected to an electric motor 75 provided outside the flow path 30, and is rotationally driven by this. The drive shaft 72 is arranged in a posture extending in a vertical direction parallel to the axial direction of the processing tank 34a.

  The stirring blade 74 is provided in a range from the lower end portion of the drive shaft 72 to the vicinity of the upper end portion. The agitating blade 74 agitates the water to be treated so that a swirling flow from below to above is formed in the treatment tank 34 a as the drive shaft 72 rotates. As a result, the plurality of microbubbles b gradually rise while turning in the circumferential direction in the treatment tank 34a. As a result, the plurality of micro bubbles b diffuses into the processing tank 34a.

  As shown in FIG. 1, the water treatment device 20 of the present embodiment further includes a first sensor 82, a second sensor 84, and a control unit 86.

  The first sensor 82 is a sensor that detects the pressure in the pipe on the upstream side (the side on which the pair of electrodes 52 is provided) of the supply pipe 42, that is, the pressure of the gas. It is.

  The 2nd sensor 84 is a sensor which detects the pressure in the flow path 30, ie, the pressure of to-be-processed water.

  The controller 86 controls the opening / closing of the opening / closing valve 46 according to the detection values of the sensors 82 and 84. Specifically, the drive operation of the water treatment apparatus 20 including the control contents of the control unit 86 will be described together with the mechanism for treating the water to be treated, with reference to FIG.

  First, the on-off valve 46 is closed (step ST10).

  Then, a gas containing oxygen is supplied between the pair of electrodes 52 by the pump 44 (step ST11). In this state, a voltage is applied between the pair of electrodes 52 (step ST12). As a result, a plasma discharge reaction occurs in the gas between the pair of electrodes 52. Specifically, oxygen contained in the gas is supplied with electrons (e) and reacts as shown in the following reaction formula (1) to generate oxygen radicals (.O).

O ₂ + 2e → 2 · O + 2e (1)
In addition, step ST11 and step ST12 may be performed in the reverse order to the above, or may be performed simultaneously.

  Thereafter, the pump 38 is driven (step ST13), and the water to be treated is sent into the flow path 30. Subsequently, the miniaturization means 60 and the stirring means 70 are driven (step ST14). In addition, step ST13 and step ST14 may be performed in the reverse order to the above, or may be performed simultaneously.

  In this state, the control unit 86 determines whether or not the value of the first sensor 82 is larger than the value of the second sensor 84 (step ST15). As a result, if the value of the first sensor 82 is larger than the value of the second sensor 84, the on-off valve 46 is opened (step ST16).

As a result, bubbles B containing oxygen radicals are supplied into the upstream portion 32. At this time, as shown in the following reaction formula (2), oxygen radicals react with water (H ₂ O) of water to be treated to generate hydroxy radicals (.OH).

・ O + H ₂ O → 2.OH (2)
The hydroxy radical generated by the reaction of the above reaction formula (2) has the highest reactivity among the molecular species called active oxygen and has the strongest oxidizing power. Very effective. This hydroxy radical is also present on the surface of the bubble B. That is, when the hydroxyl radical existing on the surface of the bubble B comes into contact with the water to be treated, the water to be treated is treated.

  The bubbles B are divided into a plurality of micro bubbles b by being cut by the cutter portion 64 of the divider provided in the upstream portion 32. Thereafter, the plurality of micro bubbles b reaching the lower portion of the processing tank 34a gradually floats in the processing tank 34a while being diffused in the swirl flow formed in the processing tank 34a by the stirring means 70. Therefore, the water to be treated flowing in the treatment tank 34a comes into contact with the plurality of microbubbles b, so that it is effectively treated with hydroxy radicals existing on the surface of each microbubble b.

  Then, if the value of the 1st sensor 82 becomes smaller than the value of the 2nd sensor 84, the control part 86 will close the on-off valve 46 (step ST17). In this way, the water to be treated is prevented from flowing into the supply pipe 42 from the flow path 30 and reaching between the pair of electrodes 52. Therefore, the occurrence of problems with the discharge means 50 is prevented. Specifically, when the water to be treated flows between the pair of electrodes 52, the impedance between the pair of electrodes 52 increases, and the plasma discharge reaction is less likely to occur in the gas passing between the pair of electrodes 52. The pair of electrodes 52 is prevented from corroding by being immersed in the water to be treated (ballast water or the like).

  In addition, ultraviolet rays are also generated during the discharge reaction of the above reaction formula (1). Moreover, ozone (O3) is produced | generated when the oxygen radical produced | generated at the time of reaction shown by Reaction formula (1) reacts with surrounding oxygen. Furthermore, for example, hydrogen peroxide (H 2 O 2) may be generated by a reaction between oxygen radicals and water. All of these have a bactericidal effect and a killing effect of microorganisms and the like. Thus, the water to be treated is treated with ultraviolet rays, ozone and hydrogen peroxide in addition to the hydroxy radicals.

Here, as shown in FIG. 4, at least the inner surface 30 a of the flow path 30 has a bond dissociation energy larger than the oxidation energy (120.6 kcal / mol) of hydroxy radicals existing on the surfaces of the bubbles B and microbubbles b. It is preferable to form with the substance which has. Examples of such a substance include titanium oxide (TiO ₂ ) and silicon oxide (SiO ₂ ). The bond dissociation energy of titanium oxide is 145 kcal / mol and that of silicon oxide is 150 kcal / mol. The flow path 30 itself may be made of the above-mentioned substance, or a coating layer made of the above-described substance may be provided on the inner peripheral surface of the flow path 30, and this coating layer may constitute the inner surface 30a.

  In this way, the hydroxy radical does not react with the substance constituting the inner surface of the flow path 30. In other words, the oxidation energy of the hydroxyl radical is used for the treatment of the water to be treated without being used for the oxidation of the substance constituting the inner surface of the flow path 30. For this reason, both suppression of corrosion or deterioration of the inner surface of the flow path 30 and improvement of the treatment efficiency of the water to be treated are achieved.

  In addition, it is preferable that the inner surface (the surface with which the water to be treated comes into contact) of the part downstream of the part where the on-off valve 46 is provided in the joining part 42b is also formed of the above substance. The same applies to the following embodiments.

  As described above, according to the water treatment apparatus 20 of the present embodiment, the hydroxyl radical (.OH) present on the surface of the bubbles supplied in the treated water comes into contact with the treated water. Water is processed. In the water treatment apparatus 20, the bubbles B are first refined by the refinement unit 60 and then stirred by the stirring unit 70. That is, before the hydroxy radical having a high reaction rate disappears, the bubbles B containing the hydroxy radical become a plurality of microbubbles b to greatly increase the total surface area, and the plurality of microbubbles b are stirred. Therefore, the amount of water to be treated that comes into contact with the hydroxyl radicals is dramatically increased, so that it is possible to effectively treat the water to be treated with hydroxy radicals.

  Moreover, since the micronization means 60 of this embodiment is a divider which has the cutter part 64 which divides the bubble B, the bubble B can be easily made into the some micro bubble b. Furthermore, since the cutter portion 64 has a shape that gradually decreases in thickness toward the tip, the resistance received from the water to be treated during rotation is reduced. Therefore, the drive energy of the drive shaft 62 is reduced.

  Moreover, in this embodiment, since the internal diameter of the processing tank 34a is larger than the internal diameter of the upstream part 32, when the to-be-processed water reaches the processing tank 34a from the upstream part 32, the flow rate of the said to-be-processed water falls. . And since the several micro bubble b is stirred in the processing tank 34a in which the flow velocity fell, the residence time in the processing tank 34a of the said micro bubble b becomes long. In the treatment tank 34a, the amount of water to be treated that comes into contact with the hydroxyl radicals is further increased, and the water to be treated that passes through the treatment tank 34a is treated more efficiently.

  In the present embodiment, an example in which the supply pipe 42 has two cylindrical portions 42a is shown, but the supply pipe 42 may have a single cylindrical portion 42a, or three or more. The cylindrical portion 42a may be provided. The number of the pumps 44 and the discharging means 50 is set according to the number of the cylindrical portions 42a.

(Second embodiment)
A second embodiment of the present invention will be described with reference to FIG. In the second embodiment, only the parts different from the first embodiment will be described, and the description of the same structure, operation, and effect as in the first embodiment will be omitted.

  The micronization means 60 of the present embodiment is a pressurization / decompression device that depressurizes the water to be treated in the upstream portion 32 and then depressurizes it. The pressurization decompressor includes a main body 66 that is driven to rotate about a rotation shaft 66a, a plurality of blades 68 provided on the outer periphery of the main body 66, and a decompression unit 69 that decompresses pressurized water to be treated.

  The main body 66 is arranged in a posture in which the rotation shaft 66a is in a direction orthogonal to the direction in which the water to be treated flows.

  The upstream portion 32 includes a housing portion 32a that houses the main body 66 and the plurality of blades 68, an introduction portion 32b that introduces water to be treated into the housing portion 32a, and a connecting portion 32c that connects the housing portion 32a and the treatment tank 34a. Have

  The accommodating portion 32 a has an inner diameter that is slightly larger than the outer diameter of the main body 66 and the plurality of blades 68. The cross section of the accommodating part 32a in the direction orthogonal to the rotation shaft 66a is circular.

  The introduction part 32b is connected to the upper part of the accommodation part 32a. The junction part 42b is connected to the introduction part 32b.

  The connection part 32c is cylindrical, and has a shape that connects a part of the upper part of the storage part 32a downstream of the connection part between the introduction part 32b and the storage part 32a and the lower part of the treatment tank 34a. . The water to be treated that has been pressurized in the housing part 32a is decompressed in the vicinity of the boundary between the housing part 32a and the connecting part 32c or in the connecting part 32c. That is, in the present embodiment, the vicinity of the boundary between the accommodating portion 32 a of the upstream portion 32 and the connecting portion 32 c or the connecting portion 32 c constitutes the pressure reducing portion 69 of the pressurizing and reducing device 60. The bubbles B introduced from the introduction part 32b into the storage part 32a are refined by the decompression part 69 to become a plurality of microbubbles b and are introduced into the treatment tank 34a. The cross-sectional area of the surface of the connecting portion 32c perpendicular to the axial direction of the connecting portion 32c is set to be smaller than that of the processing tank 34a. For this reason, the flow rate of the water to be treated in the treatment tank 34 a is smaller than that in the upstream portion 32.

  Next, the driving operation of the water treatment device 20 of the present embodiment will be described with reference to FIG. In FIG. 6, only the parts different from the first embodiment are displayed.

  Steps ST10 to ST12 are the same as in the first embodiment.

  In the present embodiment, after step ST12, the miniaturization means 60 and the stirring means 70 are driven (step ST14). The miniaturization means 60 of the present embodiment also has a function as a pump for sending the water to be treated in the accommodating part 32a to the treatment tank 34a via the connecting part 32c, so that the miniaturization means 60 is driven. And the water to be treated flows from the introduction part 32b to the accommodation part 32a. Therefore, the pump 38 provided in the upstream portion 32 is omitted. For this reason, step ST13 is also omitted.

  When the main body 66 of the micronization means 60 is driven and the water to be treated flows, the water to be treated begins to be pressurized immediately after being introduced into the housing portion 32a, and then the housing portion 32a that is the decompression portion 69 and the connecting portion. The pressure is reduced near the boundary with 32c or at the connecting portion 32c. At this time, the bubbles B supplied to the accommodating portion 32a become a plurality of micro bubbles b. Thereafter, each microbubble b is introduced into the lower portion of the processing tank 34a.

  As described above, also in the water treatment apparatus 20 of the present embodiment, the bubbles B are first refined by the refinement means 60 and then stirred by the stirring means 70. Therefore, the amount of water to be treated that comes into contact with the hydroxyl radicals is dramatically increased, so that it is possible to effectively treat the water to be treated with hydroxy radicals.

  In the present embodiment, the bubbles B can be made into a plurality of micro bubbles b with a simple configuration in which the bubbles B are pressurized and then decompressed.

  Moreover, in this embodiment, as FIG. 7 shows, the shape where the junction part 42b supplies the bubble B directly to the accommodating part 32a may be sufficient. In this way, the time from when the bubbles B are supplied into the water to be treated until the bubbles B become microbubbles b is shortened. Therefore, since the disappearance of hydroxy radicals before the bubbles B become a plurality of micro bubbles b is suppressed, the treatment efficiency of the water to be treated is improved.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and further includes all modifications within the meaning and scope equivalent to the scope of claims for patent.

  For example, in each of the above embodiments, as shown in the plan view of the flow path 30 in FIG. 8, a part of the inner surface of the upstream portion 32 may be smoothly connected to the inner peripheral surface of the processing tank 34a. Thereby, the to-be-processed water in the upstream part 32 flows in into the processing tank 34a so that the swirl flow formed with the stirring blade 74 may be followed. In this way, a stronger swirling flow is formed in the treatment tank 34a. In FIG. 8, illustration of the finer means 60 and the stirring means 70 is omitted.

  Moreover, in each said embodiment, although the example in which the axis | shaft of the process tank 34a extended to a perpendicular direction was shown, the process tank 34a may be arrange | positioned with the attitude | position with which the axis becomes horizontal.

  The on-off valve 46 is a check valve that allows gas that has passed between the pair of electrodes 52 to pass through the flow path 30 and prevents the inflow of water to be treated from the flow path 30 to between the pair of electrodes 52. There may be. In this case, the sensors 82 and 84 and the controller 86 are omitted. The on-off valve 46 can be omitted.

DESCRIPTION OF SYMBOLS 20 Water treatment apparatus 30 Flow path 30a Inner surface 32 Upstream part 34 Downstream part 34a Treatment tank 40 Bubble supply means 42 Supply pipe 44 Pump 46 On-off valve 50 Discharge means 52 A pair of electrodes 54 Power supply 60 Refinement means 62 Drive shaft 64 Cutter part 66 Main body 68 Blade 70 Stirring means 72 Drive shaft 74 Stirring blade 82 First sensor 84 Second sensor 86 Control unit B Bubble b Microbubble

Claims (6)

A water treatment device for treating water to be treated,
A flow path through which the water to be treated flows;
Discharge means for causing a discharge reaction in the gas introduced into the flow path;
Refining means for refining bubbles formed by introducing the gas into the flow path;
A water treatment apparatus comprising: stirring means for stirring microbubbles refined by the refinement means. The water treatment apparatus according to claim 1,
The said refinement | miniaturization means is a water treatment apparatus containing the divider | distributor which has the cutter part which divides the said bubble. The water treatment apparatus according to claim 1,
The said refinement | miniaturization means is a water treatment apparatus containing the pressurization pressure reduction device which decompresses after pressurizing the said to-be-processed water containing the said bubble. The water treatment apparatus according to any one of claims 1 to 3,
The flow path has a cylindrical upstream portion where the finer means is provided, and a downstream portion including a cylindrical treatment tank where the stirring means is provided,
The water treatment apparatus in which the cross-sectional area of the surface orthogonal to the axial direction of the treatment tank in the treatment tank is larger than that of the upstream portion. The water treatment apparatus according to any one of claims 1 to 4,
The discharging means has a pair of electrodes and a power source for applying a voltage between the pair of electrodes,
A passage that includes a gap between the pair of electrodes and that introduces the gas into the flow path; and a valve that is disposed in the passage and prevents the inflow of the water to be treated from the flow path toward the discharge unit;
A water treatment apparatus further comprising: In the water treatment apparatus in any one of Claim 1 thru | or 5,
A water treatment apparatus, wherein at least an inner surface of the flow path is formed of a substance having a bond dissociation energy larger than an oxidation energy of hydroxy radical generated in the bubbles by the discharge reaction.

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