JP2004066208A - Deodorizing/sterilizing device by combination of vacuum. ultrasonic wave, jet flow, and photooxidation - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact continuous deodorizing/sterilizing device which can generate a jet impact energy, a high vacuum, multifrequency ultrasonic wave, strong oxidizing power by a photocatalyst, and ozone by ultraviolet rays to perform advanced continuous deodorizing/sterilizing treatment by using the synergistic effect of them. <P>SOLUTION: Outside air is sucked into an ultraviolet irradiation device by vacuum negative pressure of an airtight tank having a steel plate carrying the photocatalyst as an inside face, and generated ozone is diffused into water to be treated. Additionally ultrasonic energy of high frequency is added to directly decompose organic compounds in water. Substances in the water are compressively adsorbed to a photocatalyst surface by jetting the water at high speed. Deodorization and sterilization are performed by a system of two paired towers which continuously manufactures odorless gas and sterilized treated water alternately by the synergistic effect with a means for accelerating instantaneous adiabatic expansion under vacuum and a photooxidation reaction speed. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention decomposes volatile organic compounds and hardly decomposable organic chlorine compounds dissolved in contaminated groundwater and industrial wastewater, and deodorizes microorganisms in water by highly sterilizing microorganisms. And sterilization, for example, decompose groundwater and industrial wastewater contaminated with harmful substances such as trihalomethane, trichloroethylene, tetrachloroethylene, and dioxin without using chemicals, convert them to harmless gas components, separate them from water, and separate contaminated water. The present invention relates to an apparatus for simultaneously performing deodorization and sterilization for restoring harmless water.
[0002]
2. Description of the Related Art In order to remove organic compounds in water, water is sprinkled from the upper part of a tall tower and air gas is sent in from the lower part, and volatile organic substances in the water are moved and diffused into the air gas, which is converted into activated carbon. The adsorption treatment method is widely used. In addition, silica gel is often used in the adsorption method.
[0003] A method has also been used in which a hardly decomposable organic chlorine compound is thermally decomposed by high heat and absorbed by the above-mentioned adsorbent for treatment.
[0004] A method of decomposing and sterilizing organic substances with ozone generated using a small-scale silent discharge or an ultraviolet lamp is also known.
[0005] For the treatment of volatile organic compounds mixed in groundwater, a method combining non-decomposition with aeration and adsorption and a chemical decomposition method for direct decomposition are also well known in addition to a method using biodegradation. . In addition, the direct injection of oxidants into groundwater for chemical treatment has recently been used in the United States, but leaves problems in the quantity and control of chemicals.
[0006]
It is well known that the strong oxidative decomposition power of ozone has an excellent bactericidal effect, but it does not cause harmful gases of acidic odor and does not harm humans in hospitals and the like. Lack of generality due to usage restrictions such as limited to nighttime use only. Or adsorb the reaction or activate the titanium dioxide photocatalyst is adsorbed light, light adsorbed oxygen and sometimes and organic matter and carbon monoxide CO to adsorb oxygen O ₂ when the titanium dioxide photocatalyst is irradiated with light Oxidation to carbon dioxide has been known for a long time, but because of the inability to induce dissociation and adsorption phenomena on molecules on photocatalysts, it was not possible to carry out rapid reaction of them. The throughput was small and generally not practical.
[0007] Many methods have been devised for treating volatile organic compounds or hardly decomposable organic chlorine compounds. However, there is no safe method which can be specified from the viewpoint of environmental protection, especially for the treatment of these in water. For example, in the general evaluation of the aeration adsorption method, which is currently widely used, a large installation area is required, and large-scale exhaust gas emissions and industrial adsorbent waste are Because of the social difficulties involved in processing, they have been shunned. Therefore, from the viewpoint of environmental protection on a global scale, there is a high need for a chemical-free, harmless type device that does not emit industrial waste, and the problem to be solved by the present invention is a chemical-free type. Without the use of filtration membranes and adsorbents such as hollow fiber membranes that become industrial waste, the exhaust gas is harmless and requires only a small amount. is there.
[0008]
In order to solve the above-mentioned problems, a deodorizing / sterilizing apparatus according to the present invention is disclosed in JP-A-2000-325702. Vacuum and ultrasonic energy are applied to the water to be treated without using the drugs disclosed in Japanese Patent Publication Nos. 2001 and 246363, and the water to be treated including the cavities generated thereby is pumped by a circulation pump provided outside. A means for rapidly compressing air bubbles on the inner wall of the tank by means of high-speed injection from the nozzle of the injection device onto the inner wall of the main unit tank, which is depressurized and decompressed by the vacuum pump The means for separating water from water is the technology described in the above-mentioned patent publication, but the technology is extended so that the technology is suitable for decomposing hardly decomposable organic chlorine compounds in the atmosphere. That is, the ultrasonic wave has a frequency of 200 kHz suitable for decomposing the hardly decomposable organic chlorine compound and the ultrasonic intensity has been increased to 6 w / cm ^{2 based} on the results of experiments in the atmosphere, and bubbles are generated by cavitation in the final step. It is equipped with a multi-frequency ultrasonic dynamo that can be changed to a frequency band of 40 kHz, which is easy to perform, to perform decomposition of organic compounds and mechanical sterilization by ultrasonic waves.
Further, in a preferred embodiment of the present invention, in the main unit tank depressurized by the vacuum pump, the low-pressure mercury lamp is covered with a glass tube made of a special quartz glass while keeping a predetermined gap. Air is supplied to the gap to generate ozone directly from oxygen in the air, and the ultraviolet irradiation device is placed in the water filled in the main unit tank so that ozone is diffused into the water to be treated from the end of the ultraviolet irradiation device. Prevents excessive ozone generation by controlling the amount of air taken in by standing upright and reducing the pressure in the main unit tank with a vacuum pump and controlling the amount of ozone generated to a concentration suitable for the purpose It is characterized by detoxification.
Further, in one preferred embodiment of the present invention, the water to be treated is injected at a high speed onto the photocatalyst surface of a stainless steel plate carrying a titanium dioxide photocatalyst which is excited by ultraviolet rays on the inner wall surface of the device tank. The organic matter in the circulating water is conveyed and pressed at high speed, the oxidative decomposition reaction rate is continuously transferred to the photocatalytic surface with the pressing force and the water to be treated, and superoxide ions are directly generated to be able to process large quantities quickly. It is characterized by.
Further, in a preferred embodiment of the present invention, a part of the jet flow jetted from a jet device provided in a space above the virtual center axis in the tank of the present device to the surrounding inner wall surface accompanies treated water. At the center, along the back of the upper lid, a vent is provided on the back of the top of the center to communicate with the vacuum pump, and a short tubular guide wing short pipe is welded around this opening to gather at the center. By guiding the water to be treated downward, the water to be treated is guided downward along the surface of the ultraviolet irradiation lamp, which is provided vertically along the virtual center axis in the apparatus tank, and oxygen in the water to be treated is irradiated with ultraviolet rays 184.9 nm. It is characterized in that it is effectively converted to ozone, and furthermore, ozone is decomposed by a light beam of 253.7 nm emitted from ultraviolet rays to generate active oxygen, thereby effectively photooxidizing organic compounds in water.
In a further preferred aspect of the present invention, the photocatalyst is always excited by light of E (ev) = 1240 / λ nm by short ultraviolet light having a wavelength of 400 nm or less by an ultraviolet irradiation lamp provided vertically in the main unit tank. As a result, the catalyst surface is always maintained in a catalytic state suitable for the chemisorption reaction. Therefore, the water to be sprayed onto the photocatalyst surface undergoes molecular decomposition and dissociation and adsorption to produce atomic hydrogen and oxygen, exhibiting a strong oxidizing power, and constantly decompose organic substances and gases in the water to be treated. This photo-oxidative decomposition reaction is characterized by a means for simultaneously treating the water to be treated and the volatile gas components by continuously injecting the photo-oxidative decomposition reaction over the entire periphery.
According to a preferred aspect of the present invention, the amount of water to be treated introduced into the main body tank from the water supply port is V (l), and the amount of air sent to the ultraviolet lamp provided in the tank is L (l). / Min, and the ozone generation capacity of the ultraviolet lamp is 0.3 mg / l (per liter of air), the ozone generation amount per minute is 0.3 Lmg / min. When this is mixed with V (l) water to be treated, the ozone concentration in the water becomes 0.3 L / V (mg / l). By this means, the ozone concentration in the constant water amount V (l) can be controlled to an arbitrary ozone concentration by controlling the air amount L (l) to be supplied. As a result of experiments, it is well known that controlling the ozone concentration in water to 0.4 mg / l has a high bactericidal effect. However, a constant ozone concentration in a continuous water treatment apparatus is known. There is no known method for continuously sterilizing treatment while maintaining the same. In the present invention, when a predetermined amount of water to be treated is supplied and vacuum negative pressure is applied to the main body tank, air proportional to the exhaust speed of the vacuum pump is introduced into the gap between the double glass tubes of the ultraviolet irradiation lamp. This is a unique invention that can be controlled to an arbitrary ozone concentration.
In the present invention, as described above, in the tank having the surface carrying the photocatalyst as the inner surface, two main body tank devices provided with a continuously illuminating type ultraviolet irradiation device and an injection device are provided. Is provided with a vacuum pump device, an ultrasonic generator, a water supply pump, a circulating pump device, and a drainage pump, which are commonly used for alternate operation of the first tower and the second tower, respectively. A separate pipe for each circuit is provided to switch to the operation in accordance with the timing of the operation, and the two tower tanks, which are always kept under reduced pressure, have a solenoid valve for vacuum break (sequence by the controller Controlled by the first tank configured as described above, wherein the breakdown of the processing steps performed in the first tank configured as described above includes water supply, ultrasonic irradiation, photo-oxidation processing with circulating jet, and deaeration ( Exhaust) One independent operation is a series of processing steps, Step A, and at the same time as the end of that step, the time-reducing device incorporated in the sequencer is used to switch the drainage step to Step B. In the operation method in which the tank of the second tower is started from the step A in accordance with the work order of the first processing step, when the time required for the step A and the time required for the step B are set to be equal, It is possible to continuously and alternately operate the first tower and the second tower. The present invention provides a continuous deodorizing and sterilizing apparatus capable of performing a complete reaction process by setting a desired time required for a complete reaction process and setting a drainage time corresponding to this time.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
FIG. 1 shows an example of an implementation flow of an integrated deodorizing / sterilizing apparatus of the above-mentioned vacuum ultrasonic jet photo-oxidation for continuous processing. The embodiment will be described with reference to FIG. In FIG. 1, the left-hand tower is defined as the first tower and the right-hand tower as the second tower for convenience, and the first and second towers are equipped with the same equipment. As a tower tank external device, a vacuum pump 2, a vacuum solenoid valve 1, a first tower air regulator 10, a second tower air regulator 10 ', a first tower vacuum pressure sensor 14, a second tower pressure sensor 14', water supply The pump 11, the first and second tower water supply solenoid valves 4 and 4 ', and the circulation pump 8 are shared, the first and second tower suction water pipes 27 and 27', the first and second tower pumping pipes 29, And 29 ', the solenoid valves for switching the suction pipes and the pumping pipes of the first and second towers 80 and 81, respectively, and the drainage solenoid valves for the first and second towers 5 and 5', respectively. The multi-frequency ultrasonic dynamo 9 commonly used for the drain pump 12 with the solenoid valve and commonly used for the first and second towers is provided outside the main unit tank. The main unit tanks 22 and 22 'of the first and second towers have steel plates 23 and 23' supporting a photocatalyst as inner surfaces, and a predetermined amount of water to be treated is introduced from a water supply port and circulated to the upper portion of the remaining space. Injection devices 19 and 19 ′ having a plurality of injection noselets connected to water pumping pipes 29 and 29 ′ are provided, and are connected so as to cause high-speed collision of the circulated water to be treated with the photocatalyst surface. And installed. Further, the plurality of ultraviolet irradiation devices 7 and 7 ′ cover a vertically long low-pressure mercury lamp tube of the ultraviolet light emitting portion with a certain gap using a special quartz glass tube, and have a solenoid valve for air intake provided at the head. 50 for the first tower and 50 'for the second tower, and an energization terminal provided for each of them, and the terminal is vertically erected standing upright on the water to be treated introduced into the main tank. When the interior of the main unit is placed in a negative pressure state in the gap between the double glass tubes of the ultraviolet lamp which is installed and is always energized, when the solenoid valve 50 above the lamp is open, air is sucked from the outside, and An ultraviolet irradiation device having a structure that converts a part of the oxygen into ozone and disperses it into the water to be treated through the exhaust ports 60 and 60 ′ of the terminal is provided. In addition, a vibrator vibrating by a current from the multi-frequency ultrasonic dynamo 9 is provided on the bottom plate of the main unit tank so that the ozone radiated into the water to be treated reacts well with the water. Oscillation occurs at a high frequency according to a signal command from the water level gauges (82, 83), so that ozone is mixed with water to exhibit a strong oxidizing effect. It is controlled by a sequencer (not shown) to destroy the compound, and after a certain period of time, it switches to low-frequency vibration by a timed device set in the sequencer and induces cavitation in water to induce vacuum. The system is provided with a control to move to a step of discharging by pump exhaust.
As described above, in the main unit in which the operation of the first and second towers is alternately controlled as a pair, the vacuum apparatus and the ultraviolet irradiation apparatus are constantly operated for both the first and second towers when the power is turned on. Enter the state. Subsequently, in the first tower, starting from the water supply step of the step A and reaching a predetermined water depth, the ultrasonic irradiation and the circulating jet step are started by a signal from the level switch 82. At the same time, the air adjusting solenoid valve 10 is opened, and the outside air is sucked through the ultraviolet irradiation device by the exhaust of the vacuum pump to generate ozone, and is diffused from the terminal of the ultraviolet irradiation device to the water to be treated in the main unit tank. On the other hand, an ultrasonic vibration having a high circulating number is directly applied at the same time as the above step, and while ozone is mixed well with water, it is decomposed by a constantly irradiated ultraviolet ray of 253.7 nm and superoxide ion / O ₂ ^- or -Generates OH radicals and directly deoxidizes volatile organic compounds and hardly decomposable organic chlorine compounds in water, while decomposing by the synergistic action of ultrasonic vibration with the mechanical decomposing power. Further, the water to be treated is suctioned and pressurized by an external circulation pump, and is injected at high speed from the injection device 19 in the tank along with the odorous gas to the photocatalyst surface 23. It becomes high temperature and undergoes photo-oxidation on the photocatalyst surface which is always excited to the catalyst state by ultraviolet rays. Thus, the fine particles undergo instantaneous expansion in an atmosphere under vacuum and reduced pressure, and the organic compounds that are compression-adsorbed on the catalyst surface are molecularly decomposed and dissociated and adsorbed, producing carbon monoxide and forming on the photocatalyst surface. It reacts with the oxygen that is being produced to cause a deodorization reaction that changes to carbon dioxide gas. An unprecedented high-speed photo-oxidation reaction is achieved over the entire surface of the main body tank by repeating this chemical-physical reaction several times at a predetermined time and minute by a circulation pump. Subsequently, when the certain time has elapsed, the time is switched to low frequency vibration for inducing cavitation by the ultrasonic wave, and the gas component in the water is captured by the cavity and completely degassed and discharged. The time required so far is assumed to be m minutes, and controlled by the time limiter of the sequencer, the first tower shifts to the wastewater treatment step of B, and the time required for this is the same m as the time m required for the above step. The performance capacity of the discharge pump is selected so that In addition, at the same time as the discharge step of the B step, the operation is repeated in the order of the B step following the A work step of the second tower or the first tower, whereby the water to be treated is rapidly and continuously treated in a large amount. The present invention provides a continuous deodorizing and sterilizing apparatus by photooxidation.
[0017]
【The invention's effect】
The equipment that simultaneously sterilizes water and deodorizes odors repeatedly circulates water containing air bubbles separated by ultrasonic energy to the photocatalyst surface, which is constantly excited by ultraviolet energy, under a vacuum decompression environment. By carrying out the reaction, the organic compound is securely transported and compressed together with the air bubbles, and the heat is generated by instantaneous adiabatic expansion in a vacuum state. Furthermore, ozone is generated directly from the outside air sucked on the surface of the ultraviolet lamp, and the ozone is diffused into water. And it reacts directly with the organic compound in the water to be treated by the vibration of the high frequency band of the ultrasonic wave, preventing the formation of intermediate substances and continuously and quickly and mass-treating the deodorization and sterilization of the water contaminated with the organic compound. The social environment preservation effect is great by providing compact equipment that makes it possible.
Further, from the viewpoint of economic effect, purification of contaminated groundwater particularly found on the site of a factory in a densely populated city area, and repair of surface soil of dead land contaminated with dioxin, etc. are performed by means of washing with the purified water. To provide equipment with a large economical effect, which makes it possible to reduce the cost of topsoil replacement work and to reuse land.
Also, from the fields of drinking water and food, the provision of equipment for preventing infection by 0-157 bacteria, Escherichia coli, Salmonella, Cribtosporidium, etc. plays an important role in protecting the general social environment. In addition, the provision of this device, which continuously treats a large amount of water to be treated in a compact manner, enables direct purification of factory wastewater by deodorization and sterilization, reducing the load on the final treatment plant and enabling safe discharge of rivers such as trihalomethane. It is a highly economical device that provides a device that prevents the generation of various carcinogenic substances and supports environmental conservation measures.
[Brief description of the drawings]
FIG. 1 is a system diagram showing an example of a preferred embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Vacuum solenoid valve 2 Vacuum pump 4 1st tower Water supply solenoid valve 4 '2nd tower Water supply solenoid valve 5 1st tower Drain solenoid valve 5' 2nd tower Drain solenoid valve 7 1st tower Ultraviolet irradiation device 7 '2nd tower Ultraviolet Irradiation device 8 Circulation pump 9 Multi-frequency ultrasonic dynamo 10 First tower air conditioner 10 'First tower air conditioner 11 Water supply pump 12 Drain pump 14 First tower pressure sensor 14' Second tower pressure sensor 19 First tower jet Apparatus 19 ′ Second tower jet device 22 First tower main unit tank 22 ′ Second tower main unit tank 23 First tower photocatalyst carrying steel plate 23 ′ Second tower photocatalyst carrying steel plate 26 First tower Vibrator 26 'vibrator of second tower 27 suction pipe of first tower 27' suction pipe of second tower 29 pumping pipe of first tower 29 'pumping pipe of second tower 50 UV irradiation device head of first tower Solenoid valve 50 'for air intake in the second tower Electromagnetic valve 60 for air intake at the head of ultraviolet irradiation device 60 Ozone outlet 60 'at terminal of ultraviolet irradiation device of first tower Ozone outlet 80 at terminal of ultraviolet irradiation device of second tower 80 Suction water line switching electromagnetic valve 81 Pumping line Switching solenoid valve 82 First tower water level meter 83 Second tower water level meter

Claims (6)

Applying energy by vacuum, ultrasonic wave and jet impact to the water to be treated supplied from an external water supply pump, and further applying photo-oxidation by photocatalyst, ultraviolet ray and ozone, volatile organic compounds and persistent organic chlorine compounds in water An integrated deodorizing / sterilizing apparatus using vacuum ultrasonic jet photo-oxidation, characterized by alternately operating two main unit tanks for decomposing and processing continuously. The main body device tank described above has a steel plate surface supporting a photocatalyst as an inner surface, and water to be treated is introduced from a water supply port by a predetermined amount per unit time, and a plurality of noselets are provided above a space in the remaining tank. The circulating pump that sucks and circulates the water to be treated in the tank is provided outside, and the water to be treated is ejected and collided with the photocatalyst surface to photooxidize, deodorize, and sterilize organic compounds in the water. An integrated deodorizing / sterilizing apparatus for vacuum ultrasonic jet photo-oxidation according to claim 1. The main device tank having the steel plate surface supporting the photocatalyst described above as an inner surface covers the ultraviolet lamp at a predetermined interval with a transparent quartz glass tube inside, and controls the amount of ozone by controlling the amount of air sent to the gap. A plurality of vertically long ultraviolet illuminators that control the amount of generation are provided, and the irradiating ultraviolet energy constantly excites the photocatalyst. 3. The integrated deodorizing / sterilizing apparatus for vacuum ultrasonic jet photo-oxidation according to claim 2, wherein a large amount of deodorizing and sterilizing is simultaneously performed by rapidly and oxidatively decomposing the compound. In the main unit tank described above, a diaphragm for applying multi-frequency ultrasonic energy to the water to be treated is provided on the bottom plate of the tank to decompose organic substances and separate and remove gas in water from a high frequency suitable for deodorization and sterilization. 4. A vacuum ultrasonic jet integrated photo-oxidation integrated deodorizer / deodorizer according to claim 3, further comprising a multi-frequency ultrasonic wave which is switched and processed by a timed device so as to obtain a low frequency and a high vacuum state suitable for the operation. Sterilizer. In the main body device tank described above, a short pipe guide wing provided on the inner surface of the central portion of the upper lid causes an upward branch flow caused by collision of a jet jet injected at right angles to the inner wall surface to be a downward flow, and the tank longitudinal axis and It is converted into a downward flow along a vertically long ultraviolet light emitting lamp provided in parallel to decompose ozone with the power of light energy of 253.7 nm of ultraviolet light to generate superoxide ions, which are good for organic compounds in the water to be treated. 5. The vacuum ultrasonic jet light according to claim 4, wherein the water to be treated is jetted and collided with the photocatalyst surface by a circulating jet to photo-oxidize with the gas in the water to be deodorized to remove the acidic odor of ozone. Oxidation integrated deodorizing / sterilizing device. The deodorizing / sterilizing apparatus is composed of a pair of two tower tanks, and the process of treating the water to be treated is divided into two steps: a water supply, a photooxidative deodorizing / sterilizing step, and a treated water draining step. 2. The vacuum ultrasonic jet jet photo-oxidation integrated type deodorizer according to the above, which provides continuous processing of two towers by using vacuum, water supply / drainage, and ultrasonic devices together by shifting the work process of the main unit of the two towers by one step.・ Sterilizer.

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