JP3686763B2 - Water purification apparatus and method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to water purification of bay sea areas, fish farms, lakes, and water reservoirs, and more particularly to a technique that combines water jet, cavitation, and ozone.
[0002]
[Prior art]
Purification of the water area in the environment where humans live is an issue.
[0003]
(1) About the algae generated in the lake and the aquarium of the dam, especially the aoco that breeds abnormally in the summer, it not only makes the appearance of the water turbid but also gives off a strange smell and deprives people of rest . An appropriate amount of plankton can feed on aquatic organisms such as crucian carp, but if it occurs in large quantities, pathogenic insects may be generated due to lack of sunlight and water circulation, leading to the death of fish and shellfish.
[0004]
(2) About red tide plankton in the cultivated area in the bay It is a harmful seawater plankton represented by shutnera and kills a large amount of cultured fish and shellfish. If these carcasses remain undegraded and accumulate in the form of sludge on the sea floor, problems such as off-flavors may occur, especially in closed water areas where seawater is not circulated and replaced.
[0005]
(3) Chlorine-resistant protozoa became widely known as Cryptosporidium, and when mixed in tap water, fulminant diarrhea occurs in local residents. There are theories that it originates from wastewater from industrial waste sites and sewage leaking from farms, but the details are not well understood.
[0006]
(4) Dioxins and various surfactants are representative examples of environmental hormones (endocrine disrupting substances). It mixes with waste water leaking from incinerators and industrial waste sites and enters human living areas.
[0007]
(5) Viruses etc. that differ from the above (2) regarding pathogenic insects in farms such as shrimps, and are caused by water pollution. According to the purification of the water in the farm, the purification of the aquaculture water is important because shrimp lesions are drastically reduced and the growth of the shrimp is significantly increased.
[0008]
As described above, each is an environmental problem of a different type from the former pollution that originated from a specific company or factory, and countermeasures are urgently needed. On the other hand, injection of ozone (O ₃ ) and hydrogen peroxide (H ₂ O ₂ ), ultraviolet irradiation, air blowing into the bottom of the water area (bubbling), circulation of water in the water area using a jet pump, or application of ultrasonic waves Etc. have been proposed. However, due to cost problems, side effects are too strong, or sufficient effects are not achieved, the countermeasure technology has not been established and the technology has not yet spread widely. is there.
[0009]
As a conventional technique, a technique of blowing ozone in the form of bubbles has been proposed. This technology aims at the oxidation / decomposition action of ozone alone, and even if the ozone bubbles are made finer, the effect is limited. Increasing the amount of ozone supplied increases the effect, but increases the cost and may cause side effects as will be described later.
[0010]
On the other hand, there is a conventional technique in which an oxidation / decomposition reaction similar to that of ozone is performed using hydrogen peroxide. The problem of using hydrogen peroxide is the same as that of ozone. The supply of hydrogen peroxide or ozone alone has a limit in the effect of oxidation and decomposition.
[0011]
[Problems to be solved by the invention]
FIG. 13 shows a conventional technique for injecting ozone into the purification target water 6. Ozone generated by the ozone generator 7 is fed by a hose 8 and blown out into the purification target water 6 as bubbles 9. This technique is often used as a sterilization measure for fish farms, but has the following problems.
[0012]
(1) Since ozone is supplied into the water as air bubbles or as a relatively large group of bubbles (having a diameter of about several millimeters), the decomposition and diffusion of ozone in water is poor, and the amount that floats on the water surface and dissipates into the atmosphere Many are inefficient.
[0013]
(2) Although the amount of use of lively ozone is increased due to the factor (1), it adversely affects the human body (workers) and farmed fish and shellfish. Respiratory diseases are the main harms to the human body, and off-flavors are also a problem. Fish shells, on the other hand, die if too much ozone is used.
[0014]
In this way, ozone has a strong oxidizing effect, but it has a “double-edged sword” nature, so if it is not appropriate for its usage, it will have a negative effect.
[0015]
FIG. 14 shows a technique in which a high-speed water jet is blown out in water and cavitation generated in the water jet is used. This utilizes an impact pressure generating action by cavitation, a local pyrolysis action and an oxidation action, but there is a problem that the sterilization effect is not always sufficient only by cavitation. However, the method by cavitation generated in the water jet also has an effect of changing water into enormous fine bubbles and mixing and stirring the water area.
[0016]
As described above, although the two conventional techniques, ozone and water jet, have their respective characteristics, there is a tendency that the taste cannot be fully achieved by itself. An object of the present invention is to provide a novel water purification device and a method thereof in view of these problems.
[0017]
[Means for Solving the Problems]
In order to solve the above problems, the present invention mainly adopts the following configuration.
[0018]
A water purification device that injects a high-speed water jet from a nozzle into a purification target water area, and decomposes harmful substances in the water area due to cavitation generated in the high-speed water jet,
The nozzle includes a high-pressure water supply channel and a small-diameter ejection hole provided at a tip of the high-pressure water channel, and the high-pressure water is injected through the small-diameter ejection hole to cause cavitation. Forming a water jet with
An ozone mixing nozzle having an opening for forming a contraction part, a throat and an enlarged part is provided at the outlet part of the nozzle,
From the throat of the opening of the ozone mixing nozzle, bubbled ozone is blown out toward the high-speed water jet accompanied by cavitation,
The blown-out bubble-like ozone is formed so as to flow into the high-speed water jet accompanied with the cavitation and become a nucleus of cavitation generated in the high-speed water jet,
Furthermore, vortex cavitation is generated at the interface of the high-speed water jet by a circulating vortex formed between the outlet of the throat and the high-speed water jet,
The water purification apparatus which produces | generates the synergistic effect of the cavitation cloud by the said cavitation nucleus of the said high-speed water jet, and the said vortex cavitation.
[0019]
A water purification method in which a high-speed water jet is jetted from a nozzle into a purification target water area, and harmful substances in the water area are decomposed by cavitation generated in the high-speed water jet,
The nozzle includes a high-pressure water supply channel and a small-diameter ejection hole provided at a tip of the high-pressure water channel, and the high-pressure water is injected through the small-diameter ejection hole to cause cavitation. Forming a water jet with
From the throat of the opening having a contraction part, a throat and an enlarged part formed in the ozone mixing nozzle provided at the outlet part of the nozzle, bubble-like ozone is blown out toward the high-speed water jet accompanied by cavitation,
The balloon of the bubble-like ozone, the bubble-like ozone which has flowed into the high velocity water jet is formed to have a nucleus of cavitation occurring in high-speed water jet with the cavitation,
Furthermore, vortex cavitation is generated at the interface of the high-speed water jet by a circulating vortex formed between the outlet of the throat and the high-speed water jet,
A water purification method that exhibits a synergistic effect between a cavitation cloud formed by the cavitation nuclei of the high-speed water jet and the vortex cavitation.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a configuration example of a nozzle device for water purification according to the first embodiment of the present invention, and shows a configuration for using ozone as bubble nuclei (Nuclei) of cavitation of an underwater water jet. . In the nozzle 1, the high-pressure water 2 is guided through the high-pressure water supply flow path 3, and is jetted from the ejection holes 4 into the water to be purified 6 to become a submerged water jet 5 with cavitation. At the outlet of the nozzle 1, there is provided an ozone mixing nozzle 17 having an opening that forms a gradual contraction, a throat 16 and a gradual enlargement.
[0024]
The ozone 20 is blown out as ozone bubbles 21 from a plurality of ozone injection nozzles 19 opening in the throat 16 of the ozone mixing nozzle 17 and flows into the underwater water jet 5 accompanied by cavitation. As will be described later, the ozone bubble 21 becomes a so-called “seed” for activating cavitation violently.
[0025]
FIG. 2 is also a configuration example of a nozzle device for water purification according to the second embodiment of the present invention, and shows a configuration for using ozone as a bubble core of cavitation generated in an underwater water jet. In the nozzle 1, the high-pressure water 2 is guided through the high-pressure water supply channel 3, and is injected into the purification target water 6 from the ejection hole 4 having a small diameter, thereby forming an underwater water jet 5 with cavitation. In this nozzle 1, an enlarged cavity portion 10 that expands in a conical shape is provided at the outlet of the ejection hole 4.
[0026]
In the present embodiment, an ozone supply unit and an ejection unit are provided on the outer periphery of the nozzle 1. The ozone 20 is guided through an ozone supply flow path 23 and blown out from a plurality of ozone jet nozzles 24 opened at the tip thereof to become an ozone jet 25 composed of ozone bubbles 21 into the submerged water jet 5 accompanied by cavitation. Inflow. Since the underwater water jet has the property of entraining ambient water (entrainment), the ozone bubbles 21 are easily mixed into the jet 5 and, as will be described later, so-called violently activating cavitation. “Seeds”.
[0027]
In the third embodiment shown in FIG. 3, ozone is supplied into supply water (which may be water to be purified itself) for creating an underwater water jet, pressurized with a plunger pump and physically dissolved, It is intended to be a bubble core for jet cavitation. Ozone 20 is supplied in the state of bubbles 21 into the ozone dissolution tank 30, and water containing ozone is pressurized by the plunger pump 29. These ozone bubbles 21 become fine bubbles in water by being pressurized by the plunger pump 29.
[0028]
When the nozzle 1 depressurizes and accelerates and is injected, it transforms into a bubble core of cavitation, and vigorously activates cavitation in the submerged water jet 5. A considerable degree of the cavitation bubbles in the submerged water jet 5 is ozone, and this jet has not only a shocking mechanical action but also a strong oxidation / decomposition action. The nature of ozone remains unchanged even if it is compressed by being compressed with a plunger pump, or even if the form is changed to cavitation.
[0029]
The nozzle device shown in FIG. 4 is a fourth embodiment of the present invention different from the embodiment shown in FIGS. 1 and 2. Ozone 20 is blown out toward the ejection hole 4 of the nozzle 1 from the ozone ejection annular port 31 provided on the outer periphery of the enlarged cavity 10 in a direction against the flow of the submerged water jet 5.
[0030]
The ozone 20 is guided through an ozone supply channel 23 provided on the outer periphery of the nozzle 1. As will be described later, the ozone blown out from the ozone discharge annular port 31 immediately flows into the underwater water jet by the action of the circulating vortex generated inside the enlarged cavity 10 (32). This ozone also becomes a so-called “seed” for activating cavitation in the jet 5 as in the embodiment of FIGS. 1 and 2.
[0031]
FIG. 6 shows an entire system when the water purification apparatus according to the embodiment of the present invention is applied to a purification target water area 6 such as a lake. The apparatus in which the ozone mixing nozzle 17 is combined with the nozzle 1 is supported in the water below the rising moving body 49, and jets a submerged water jet 5 having strong oxidizing action into the water of the purification target water area 6 along with ozone. This device is held by the nozzle support 50 but can be moved in the height direction, that is, in the depth direction. Water in the purification target water area 6 is pumped up by the circulation pump 42, temporarily stored in the water storage tank 43, pressurized by the high pressure pump, and sent to the nozzle 1 through the high pressure hose 45.
[0032]
On the other hand, ozone is produced in the ozone generator 46, further pressurized by the compressor 47, and sent to the ozone mixing nozzle 17 mounted on the outer periphery of the nozzle 1. As an example of the combined configuration of the nozzle 1 that blows out water and the ozone-mixing nozzle 17 that blows out ozone, the one shown in FIG. 1 may be applied.
[0033]
FIG. 7 schematically shows the behavior and action in water when the first embodiment shown in FIG. 1 is applied to water purification. First, the high-pressure water 2 is jetted from the nozzle 1 to become an underwater water jet 5 accompanied by cavitation. The ozone 20 is blown from the throat 16 of the ozone mixing nozzle 17 through the ozone injection nozzle 19, becomes ozone bubbles 21, and flows into the underwater water jet 5 accompanied by cavitation.
[0034]
The ozone bubbles 21 become cavitation bubble nuclei in the jet 5, and formally appear as rapid expansion of the cavitation cloud. The cavitation cloud 37 is rapidly expanded and then split (37 a), and is discharged to the downstream area of the jet 5. As described above, the behavior of the cavitation cloud 37 is extremely unsteady and changes drastically according to the inflow of ozone bubbles. In other words, the strength of non-stationarity means that cavitation is powerful, and is effective for water purification.
[0035]
Further, a strong circulation vortex 36 is formed between the outlet of the throat 16 in the ozone mixing nozzle 17 and the underwater water jet 5 accompanied by cavitation, and a vortex cavitation 38 derived from this vortex is generated at the interface of the jet 5. This vortex cavitation 38 is also powerful. In other words, the synergistic action of the cavitation cloud 37 and the vortex cavitation 38 derived from the above-mentioned ozone bubbles effectively purifies the water quality, that is, kills harmful organisms in the water area.
[0036]
FIG. 8 schematically depicts the behavior in water when the second embodiment shown in FIG. 2 is applied to water purification. The high-pressure water 2 is fed through the high-pressure water supply flow path 3, is rapidly decompressed and accelerated through the ejection holes 4, and is ejected to form an underwater water jet 5 with cavitation. The ozone 20 is guided through the nozzle outer peripheral tube 22 and is jetted into the water from the ozone jet nozzle 24 to become fine ozone bubbles 21 and flows into the submerged water jet 5 (39). This ozone bubble becomes a bubble core of cavitation in the jet 5. The ozone bubbles appear as a rapid expansion 35 of the cavitation cloud in the jet 5, and this phenomenon becomes a periodic intense movement and activates the cavitation in the jet 5.
[0037]
Similar to the phenomenon in FIG. 7, the water quality is effectively purified because the cavitation with strong unsteadiness and strong cavitation occurs. Although the cavitation cloud 37 performs irregular and rapid expansion 35 one after another, a strong pressure fluctuation is generated in the jet, and this pressure fluctuation causes an interface vortex 40 to be generated at the interface of the jet 5. A vortex cavitation 41 derived from the vortex develops. Similarly to FIG. 7, also in this embodiment, since the vortex cavitation overlaps the action of the cavitation cloud 37, the power of cavitation in the entire jet 5 is increased.
[0038]
FIG. 9 schematically illustrates a phenomenon in the vicinity of the nozzle in the third embodiment shown in FIG. 3, and a phenomenon when ozone is jetted as an underwater water jet 5 in a state of being physically dissolved in water. Is shown. High-pressure water 2 a containing ozone as bubble nuclei is supplied through the high-pressure water supply flow path 3 of the nozzle 1. The high-pressure water 2a is suddenly depressurized and accelerated, and is jetted from the ejection hole 4 into the purification target water 6 to become an underwater water jet 5 accompanied by cavitation.
[0039]
Ozone that has been pressurized and trapped in the water sent to the nozzle is precipitated as a group of fine bubbles in the initial region of the jet 5 due to an abrupt action when passing through the ejection hole (33). The precipitated ozone bubbles serve as cavitation bubble nuclei and develop cavitation in the submerged water jet. In this embodiment, there is no severe unsteadiness such that the cavitation cloud as shown in FIG. 7 or FIG.
[0040]
FIG. 10 schematically illustrates a phenomenon in water when the fourth embodiment shown in FIG. 4 is applied to water purification. The phenomenon that the supplied ozone bubble 21 appears as a rapid expansion 35 of the cavitation cloud 37 in the jet 5 is basically the same as the contents shown in FIGS. The ozone 20 is guided through the ozone supply flow path 23, blown out from the ozone discharge annular port 31, and supplied so as to go backward in the jet direction of the jet 5 in the enlarged cavity portion 10.
[0041]
The ozone 20 is first ejected in a columnar shape (which looks like a columnar shape in this cross-sectional view but is actually a three-dimensional cone-shaped film), but it is torn in such a steep flow field and becomes an ozone bubble 21. Involved into the jet 5. These ozone bubbles 21 become cavitation nuclei, rapidly expand inside the jet 5, and grow into a cavitation cloud 37. The cavitation cloud 37 is split downstream of the jet 5. Due to such intense movement of the cavitation cloud 37, interfacial vortices 40 are successively generated around the jet 5, and this creates a powerful vortex cavitation 41.
[0042]
FIG. 11 compares the sterilization effect of the embodiment of the present invention (FIG. 1) and the prior art using only a water jet. The cell disinfection rate r / r ^{* on the} vertical axis is made dimensionless by dividing the cell removal amount r by the cell removal amount r ^* in the conventional technique (in the case of only a water jet, FIG. 14). is there. It can be seen that the effect of sterilization is markedly increased by 10 times or more compared to the case of using only the water jet.
[0043]
FIG. 12 compares the prior art using only ozone (FIG. 13) and the embodiment of the present invention (FIG. 1). The change rate of the cell density on the vertical axis, in other words, the residual cell rate, is made dimensionless by dividing the cell density n by the cell density n ^* in the initial state. The number density of bacteria in the contaminated raw water used for the experiment is a fairly high condition (more than 10 ⁴ per cc). In the prior art using only ozone, the residual bacteria rate is about 0.1, whereas in the case of the embodiment of the present invention, it was found that the residual bacteria rate was successfully reduced to about 1/5. .
[0044]
The effects obtained by embodying the present invention were verified by the results of the above two verification tests.
[0045]
FIG. 5 shows a water purification apparatus according to still another embodiment of the present invention. The nozzle 1 ′ for injecting the high-pressure water 2 is provided with the enlarged cavity 10 at the outlet of the ejection hole, and is the same as the nozzle according to the embodiment shown in FIG. 2 or FIG. 4. The ozone supplied to the vicinity of the nozzle 1 ′ is supplied so as to blow out from the ozone supply nozzle 15 through the ozone supply annular duct 12 provided on the outer edge of the outlet of the nozzle 1 ′ (13). As a result of this, the water is mixed into the underwater high-speed water jet 5 accompanied by cavitation.
[0046]
The ozone supply annular duct 12 has a donut-like outer shape, and an ozone supply nozzle 15 is provided at a position of four equal divisions (90 ° pitch) in the circumferential direction. The ozone supply annular duct 12 is supported on the main body of the nozzle 1 ′ by a support 14.
[0047]
The phenomenon caused by this configuration is similar to that shown in FIG. 7 or FIG. 10, and ozone supplied in a bubble state becomes a so-called “seed” of cavitation, and in the submerged water jet 5, the cavitation cloud suddenly It becomes a factor which repeats expansion and division violently. Furthermore, the jet 5 is also turbulent and the generation of vortex cavitation is promoted. Since the strong oxidation action and the cavitation action by ozone are combined in this way, this embodiment greatly contributes to the purification of water quality.
[0048]
As described above, in the present invention, a small amount of ozone to be injected is used so that it becomes a “bubble nucleus (Nuclei)” of an underwater water jet. In order to supply a small amount of ozone to be the core of cavitation, the following configuration is adopted for ozone injection.
[0049]
(1) Ozone is injected in the form of bubbles from the periphery of an underwater water jet ejected from an underwater nozzle.
[0050]
(2) A perforated plate made of fine holes is provided on the outer periphery of the submerged nozzle, and ozone is extruded through this to form fine bubbles. These fine bubble-like ozone is blown out and supplied in parallel with the water jet from the upstream side of the nozzle for jetting the water jet, and is sucked into the water jet.
[0051]
(3) Injecting ozone into the water used for the water jet and pressurizing it with a plunger pump, etc., physically dissolves the ozone in the water and deposits it as a bubble at the time of depressurization when ejected from the nozzle. Use as bubble nuclei.
[0052]
(4) Using a nozzle provided with a conical enlarged cavity at the outlet of the nozzle, ozone is guided to the outer peripheral end of the enlarged cavity or the opening of the side surface of the inner wall of the enlarged cavity, and ejected. Cavitation generated in the water jet is promoted by supplying these ozone in the form of bubbles into the water jet and using ozone as the bubble core.
[0053]
As described above, the embodiment of the present invention intends to reduce the amount of ozone used, use it without waste, and enhance the power of cavitation by using it as the core of cavitation to improve the efficiency of water purification. To do.
[0054]
According to the embodiment of (1), the bubble-like ozone becomes the cavitation bubble nucleus and is sucked (entrained) into the underwater water jet to promote cavitation. Water is sterilized and purified by the weight effect of cavitation and ozone sterilization.
[0055]
The embodiment (2) is the same as the operation (1). Micronized ozone bubbles are sucked into an underwater water jet, becoming the core of cavitation and promoting cavitation. Purifies water by promoting cavitation and oxidizing and sterilizing with ozone.
[0056]
In the embodiment of the above (3), the ozone pressurized by the plunger pump and melted in water is precipitated when the ozone is depressurized in the nozzle orifice and becomes a high-speed water jet, and a group of fine ozone bubbles. It becomes. Thus, according to this embodiment, since ozone is in the underwater water jet from the beginning, cavitation is promoted, and water is efficiently purified by the weight effect of the oxidation and sterilization action of ozone.
[0057]
According to the embodiment (4), since ozone is supplied around the nozzle ejection hole, the ozone is efficiently sucked into the circulation vortex in the enlarged conical cavity. The position where ozone is sucked in is optimal for becoming the core of cavitation and promotes cavitation. Water is efficiently purified by the weight effect of this and the oxidation and sterilization action of ozone.
[0058]
As described above, according to the embodiment of the present invention, although the amount of ozone to be used is small, the surface area of the ozone bubbles is increased because it is handled as fine bubbles, and the oxidizing action by ozone converts a large amount of ozone into large bubbles or gas masses. The water purification effect is higher than the case of handling. Moreover, since ozone is microbubbled, it also acts as a nucleus of cavitation. As described above, the present invention has one of its features in that the two actions are combined well and utilized.
[0059]
【The invention's effect】
The effects born by embodying the present invention are summarized as follows.
[0060]
(1) The effect of sterilization can be enhanced by the weight action of ozone injection and cavitation.
[0061]
(2) The amount of ozone used can be reduced. That is, sterilization can be completed with a small amount of ozone, which is advantageous in terms of cost.
[0062]
(3) Since the amount of ozone used is reduced, the harmful effects of ozone can be avoided. Eliminate physical disabilities (eg, respiratory problems) for workers. Moreover, when this invention is applied to a farm, the harm to cultured fish shellfish can be eliminated and the yield can be increased.
[0063]
(4) Since the ozone injection facility can be simplified, it is advantageous in terms of cost.
[0064]
(5) Since there is an aid in ozone injection, the effect of sterilization can be sufficiently exerted even if the function / conditions of the water jet are somewhat reduced. That is, since the injection pressure can be lowered or the amount of water to be injected can be reduced, it is advantageous in terms of equipment cost.
(6) Since ozone is used as the core of cavitation, cavitation becomes active. Similar to the effect of (5) above, the sterilization effect can be exhibited even if the function / conditions of the water jet are slightly reduced, that is, the injection pressure is lowered or the amount of the injection water is reduced. It is.
[Brief description of the drawings]
FIG. 1 is a diagram showing the configuration of a water purification device according to a first embodiment of the present invention.
FIG. 2 is a diagram showing a structure of a water purification device according to a second embodiment of the present invention.
FIG. 3 is a diagram showing a structure of a water purification device according to a third embodiment of the present invention.
FIG. 4 is a diagram showing a structure of a water purification device according to a fourth embodiment of the present invention.
FIG. 5 is a view showing a structure of a water purification device according to still another embodiment of the present invention.
FIG. 6 is a diagram showing a systematic overall configuration when the embodiment of the present invention is applied to water purification.
FIG. 7 is a diagram showing functions and operations of the water purification device according to the first embodiment.
FIG. 8 is a diagram showing functions and operations of a water purification device according to a second embodiment.
FIG. 9 is a diagram illustrating functions and operations of a water purification device according to a third embodiment.
FIG. 10 is a diagram showing functions and operations of a water purification device according to a fourth embodiment.
FIG. 11 is a test result demonstrating the effect produced by carrying out the present invention.
FIG. 12 is a diagram showing test results and demonstrating the effects produced by carrying out the present invention.
FIG. 13 is a diagram illustrating an example of a conventional technique.
FIG. 14 is a diagram showing another example of the prior art.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Nozzle 2 High pressure water 3 High pressure water supply flow path 4 Ejection hole 5 Underwater water jet with cavitation 6 Water to be purified 10 Enlarged cavity 16 Throat 17 Ozone mixing nozzle 18 Ozone supply pipe 19 Ozone injection nozzle 20 Ozone 21 Ozone bubble 23 Ozone Supply channel 24 Ozone jet nozzle 25 Ozone jet 27 Ozone supply pipe 28 Stirrer 29 Plunger pump 30 Ozone dissolution tank 31 Ozone jet annular port 32 Inflow of ozone 35 Rapid expansion of cavitation cloud 36 Circulation vortex 37 Cavitation cloud 37a Splitting of cavitation cloud 38 Vortex cavitation 40 Interface vortex 41 Vortex cavitation

Claims (2)

A water purification device that injects a high-speed water jet from a nozzle into a purification target water area, and decomposes harmful substances in the water area due to cavitation generated in the high-speed water jet,
The nozzle includes a high-pressure water supply channel and a small-diameter ejection hole provided at a tip of the high-pressure water channel, and the high-pressure water is injected through the small-diameter ejection hole to cause cavitation. Forming a water jet with
An ozone mixing nozzle having an opening for forming a contraction part, a throat and an enlarged part is provided at the outlet part of the nozzle,
From the throat of the opening of the ozone mixing nozzle, bubbled ozone is blown out toward the high-speed water jet accompanied by cavitation,
The blown-out bubble-like ozone is formed so as to flow into the high-speed water jet accompanied with the cavitation and become a nucleus of cavitation generated in the high-speed water jet,
Furthermore, vortex cavitation is generated at the interface of the high-speed water jet by a circulating vortex formed between the outlet of the throat and the high-speed water jet,
A water purification apparatus characterized by a synergistic effect of the cavitation cloud of the high-speed water jet by the cavitation nucleus and the vortex cavitation. A water purification method in which a high-speed water jet is jetted from a nozzle into a purification target water area, and harmful substances in the water area are decomposed by cavitation generated in the high-speed water jet,
The nozzle includes a high-pressure water supply channel and a small-diameter ejection hole provided at a tip of the high-pressure water channel, and the high-pressure water is injected through the small-diameter ejection hole to cause cavitation. Forming a water jet with
From the throat of the opening having a contraction part, a throat and an enlarged part formed in the ozone mixing nozzle provided at the outlet part of the nozzle, bubble-like ozone is blown out toward the high-speed water jet accompanied by cavitation,
The balloon of the bubble-like ozone, the bubble-like ozone which has flowed into the high velocity water jet is formed to have a nucleus of cavitation occurring in high-speed water jet with the cavitation,
Furthermore, vortex cavitation is generated at the interface of the high-speed water jet by a circulating vortex formed between the outlet of the throat and the high-speed water jet,
A water purification method comprising the synergistic effect of the cavitation cloud of the high-speed water jet by the cavitation nucleus and the vortex cavitation.

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