JP2004057917A - Water treatment equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make treatable a large volume of water to be treated with a simple configuration and a high efficiency. <P>SOLUTION: In the water treatment equipment a plurality of ultrasonic irradiators 5 provided with ultrasonic oscillators are arranged apart from each other in the vertical direction within a treating vessel 1 which receives or discharges water 2 to be treated. The water 2 to be treated is passed between the ultrasonic irradiators 5 generating standing waves, by which the water is treated. The standing waves are stably generated by controlling the oscillation conditions for ultrasonic waves by a controller 9. Further, the apparatus is provided with a chemical feeder 10 at need and treats the water 2 to be treated by the synergistic effects of a chemical and irradiation with the ultrasonic wave. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a water treatment apparatus, and more particularly to a water treatment apparatus using an ultrasonic wave capable of treating a large amount of water to be treated with a simple configuration at high efficiency.
[0002]
[Prior art]
Examples of water treatment means for drinking water, sewage, wastewater, etc. include oxidizing treatment using an oxidizing agent, etc., treatment with ultraviolet light, adsorption treatment with an adsorbent such as activated carbon, water treatment with ultrasonic waves, etc. ing.
[0003]
Of these, water treatment using ultrasonic waves utilizes cavitation caused by irradiating ultrasonic waves to water and a stirring action due to vibration acceleration. Thermal decomposition of organic substances in a cavity due to cavitation, OH radicals Water treatment is performed by the action of oxidation sterilization by generation, destruction of microbial cells by shock waves at the time of cavity collapse, stirring effect by vibration acceleration, and the like.
[0004]
The above-described ultrasonic treatment method is a method capable of performing treatment only by irradiating ultrasonic waves to water, so that the apparatus configuration can be relatively simplified, and furthermore, a method capable of performing a combined treatment such as sterilization and decomposition of organic substances. is there. In addition, it has been confirmed that the ultrasonic treatment method can further improve the processing capacity by being combined with the conventional methods such as oxidation treatment and ultraviolet treatment, thereby significantly reducing the processing time and processing cost. Can be expected.
[0005]
JP-A-2000-117247 discloses a water treatment apparatus using ultrasonic waves. In this water treatment apparatus, as shown in FIG. 4, the ultrasonic oscillator 23 is controlled so that the radiation direction of the ultrasonic wave 22 radiated to the water 21 to be treated and the polarization direction of the ultrasonic oscillator 23 are substantially the same. A water treatment that is arranged at the bottom of a container 24 having a water flow path and has a structure in which the vibration mode of the ultrasonic oscillator 23 has a lateral effect and water does not directly contact a surface substantially parallel to the radiation direction of the ultrasonic waves 22. An apparatus is disclosed. The water to be treated that has flowed into the container 24 from the inlet 25 is processed by the ultrasonic waves radiated from the ultrasonic oscillator 23 in the container 24, and then flows out of the container 24 from the outlet 26.
[0006]
According to this water treatment apparatus, the ultrasonic oscillator 23 is arranged so that the radiation direction of the ultrasonic waves 22 irradiating the water to be treated 21 is the same as the polarization direction of the ultrasonic oscillator 23. Since the mode is a lateral effect and water does not directly adhere to a surface substantially parallel to the radiation direction of the ultrasonic waves 22, water does not adhere to the surface in the fundamental vibration direction. Therefore, the thickness of the container 24 is added because there is no influence of the adhesion of the dirt material or the reflection of the floating dirt material in the water to be treated 21 and the surface in the basic vibration direction does not need to be in close contact with the container 24. There is no new vibration mode, and a stable oscillation state of the ultrasonic waves 22 can be realized.
[0007]
[Problems to be solved by the invention]
As described above, the ultrasonic treatment method has many merits, but an increase in the size of the treatment apparatus is a major problem. That is, when the ultrasonic treatment method is applied to a place requiring a large amount of treatment such as a sewage treatment plant, it is conceivable to increase the volume of the treatment tank or to connect a plurality of treatment devices.
[0008]
However, it is known that the effect of ultrasonic irradiation by one oscillator decreases as the irradiation volume increases due to the effects of ultrasonic attenuation in water and the like. Therefore, there is a limit in increasing the size of the processing tank. In addition, when a plurality of treatment apparatuses are connected, a treatment capacity of about 700 liters / minute is necessary in a sewage treatment plant of a scale of 1000 m ³ / day. In order to secure a volume of liter, a large amount of processing equipment is required, which not only complicates the equipment but also requires time and labor for maintenance.
[0009]
Therefore, an object of the present invention is to provide a water treatment apparatus capable of treating a large amount of water to be treated with a simple configuration at a high efficiency when treating the water to be treated by ultrasonic waves.
[0010]
[Means for Solving the Problems]
In the invention according to claim 1, a plurality of ultrasonic irradiation devices provided with one or more ultrasonic oscillators are provided in a container into which water to be treated flows in and out, and each of the ultrasonic irradiation devices is It is characterized in that it is stacked and arranged apart from each other in the ultrasonic radiation direction.
[0011]
The invention according to claim 2 is characterized in that each of the ultrasonic irradiation devices is stacked and arranged with an interval at which a standing wave can be formed.
[0012]
According to a third aspect of the present invention, there is provided a control device for controlling at least one of an interval and an oscillation frequency of each of the ultrasonic irradiation devices.
[0013]
The invention according to claim 4 is characterized in that a chemical adding means for adding a chemical to the water to be treated is provided.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
One embodiment of the water treatment apparatus of the present invention will be described with reference to the drawings.
[0015]
FIG. 1 is a schematic sectional view showing a water treatment apparatus of the present invention, FIG. 2 is a schematic sectional view showing an ultrasonic irradiation apparatus, and FIG. 3 is a view showing a state of generation of standing waves.
[0016]
In FIG. 1, reference numeral 1 denotes a treatment tank as a vessel into which the water 2 flows, 3 denotes an inlet of the water 2, 4 denotes an outlet of the water 2, and 5 denotes an inside of the treatment tank 1. A plurality of ultrasonic irradiation devices. As shown in FIG. 2, each of the ultrasonic irradiation devices 5 includes one or more (six in this example) ultrasonic oscillators 6 provided in a housing 6B at intervals in the longitudinal direction of the housing 6B. The ultrasonic oscillator 6 is fixed to the vibration surface 6A. Each of the ultrasonic irradiation devices 5 is stacked in parallel in the processing tank 1 with a frame 7 interposed therebetween in the ultrasonic oscillation direction (vertical direction). The interval between the ultrasonic irradiation devices 5 is an interval at which a standing wave is formed. The standing wave will be described later. 8 is an ultrasonic driving power supply, 9 is a control device of the power supply 8, 10 is a medicine supply device, 11 is a medicine supply nozzle, and 12 is provided above the uppermost ultrasonic irradiation device 5. Reflector. The interval between the uppermost ultrasonic irradiation device 5 and the reflection plate 12 is the same as the interval between the lower ultrasonic irradiation devices 5. The operation of the reflector 12 will be described later.
[0017]
According to the water treatment apparatus of the present invention configured as described above, the water to be treated is treated as follows.
[0018]
The to-be-processed water 2 flowing into the processing tank 1 from the inlet 3 passes between the ultrasonic irradiation devices 5 and flows out of the processing tank 1 from the outlet 4. The following processing is performed in the process in which the to-be-processed water 2 passes between the ultrasonic irradiation devices 5. That is, when a high-frequency current is supplied from the power supply 8 to the ultrasonic irradiation device 5 according to a command from the control device 9, a displacement corresponding to the amplitude of the alternating current occurs in each ultrasonic oscillator 6, and the vibration surface 6A vibrates. Then, the generated ultrasonic waves 13 are radiated toward the water 2 to be treated.
[0019]
The ultrasonic waves 13 emitted from the ultrasonic irradiation device 5 propagate in the water to be treated 2, reach the upper ultrasonic irradiation device 5, are reflected there, and are again vibrated by the vibration surface 6 </ b> A of the lower ultrasonic irradiation device 5. Return to At this time, the wave generated from the vibration surface 6A and the reflected wave interfere with each other, so that a combined wave is formed between the ultrasonic irradiation devices 5. When the distance between the ultrasonic irradiation devices 5 is properly maintained, the synthesized wave is in a resonance state. At this time, as shown in FIG. 3, a wave called a standing wave is formed, and the waves are in a state of strengthening each other, and the above-described effect of the ultrasonic wave can be utilized to the maximum. Ultrasonic waves from the uppermost ultrasonic irradiation device 5 are reflected by the reflection plate 12, and a standing wave is formed between the uppermost ultrasonic irradiation device 5 and the reflection plate 12.
[0020]
The formation of the standing wave changes depending on conditions such as the temperature of the water 2 to be treated. For this purpose, the control device 9 controls the oscillation frequency of the ultrasonic oscillator 6 so that the standing wave is always formed stably even if the conditions change. In addition to controlling the oscillation frequency, another control device that adjusts the interval between the ultrasonic irradiation devices 5 to an interval at which a standing wave is formed may be provided. Both the oscillation frequency and the interval between the ultrasonic irradiation devices 5 may be controlled.
[0021]
The water to be treated in the portion where the standing wave is formed is effectively purified by the above-described effect of the ultrasonic wave. If the medicine is supplied from the medicine supply device 10 via the medicine supply nozzle 11 simultaneously with the irradiation of the ultrasonic waves, the water to be treated is more efficiently purified by the synergistic effect with the ultrasonic irradiation.
[0022]
In the above example, the ultrasonic irradiation devices 5 are vertically stacked in the processing tank 1, but they may be horizontally stacked. Further, a plurality of laminated ultrasonic irradiation devices 5 may be provided.
[0023]
【The invention's effect】
As described above, according to the present invention, a plurality of ultrasonic irradiation devices provided with one or more ultrasonic oscillators are provided in a container into which water to be treated flows in and out, and each of the wave irradiation devices is provided. Are arranged in layers separated from each other in the ultrasonic radiation direction, and in particular, by generating a standing wave between the wave irradiation devices, a large amount of water to be treated can be treated with high efficiency with a simple configuration. In addition, by controlling the oscillation conditions of the ultrasonic wave or the interval between the wave irradiation devices by the control device to constantly and stably generate the standing wave, the water treatment can be performed more efficiently. Further, by providing the drug supply device, a useful effect such that more effective water treatment can be performed by a synergistic effect between the drug and ultrasonic irradiation is provided.
[Brief description of the drawings]
FIG. 1 is a schematic sectional view showing a water treatment apparatus of the present invention.
FIG. 2 is a schematic sectional view showing an ultrasonic irradiation device.
FIG. 3 is a diagram illustrating a state of occurrence of a standing wave.
FIG. 4 is a schematic sectional view showing a conventional water treatment apparatus using ultrasonic waves.
[Explanation of symbols]
1: Treatment tank 2: Water to be treated 3: Inlet 4: Outlet 5: Ultrasonic irradiation device 6: Ultrasonic oscillator 6A: Vibration surface 7: Frame 8: Power supply 9: Control device 10: Drug supply device 11: Drug supply Nozzle 12: Reflector 13: Ultrasonic 21: Processing tank 22: Ultrasonic 23: Ultrasonic oscillator 24: Container 25: Inlet 26: Outlet

Claims (4)

A plurality of ultrasonic irradiation devices provided with one or more ultrasonic oscillators are provided in the container into which the water to be treated flows in and out, and each of the ultrasonic irradiation devices is separated from each other in the ultrasonic radiation direction. A water treatment apparatus characterized by being arranged in a stacked manner. The water treatment apparatus according to claim 1, wherein each of the ultrasonic irradiation apparatuses is stacked and arranged at intervals so that a standing wave can be formed. 3. The water treatment apparatus according to claim 1, further comprising control means for controlling at least one of the interval and the oscillation frequency of each of the ultrasonic irradiation devices. The water treatment apparatus according to any one of claims 1 to 3, further comprising a medicine adding means for adding a medicine to the water to be treated.

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