JP2004329988A - Liquid purifying treatment method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To effectively remove the problem that impurities or unnecessary substances dissolved in a liquid to be treated are not removed in conventional purifying treatment using ozone. <P>SOLUTION: In a liquid purifying method using ozone, a required amount of the liquid to be treated is housed in a treatment tank having an ultraviolet lamp arranged therein and a mixed gas of ozone and air is successively supplied in a state of fine air bubble groups from the bottom part of the treatment tank for the purpose of aeration to be brought into contact with the liquid to be treated under stirring. The successively supplied fine air bubble groups are irradiate with ultraviolet rays to successively form nascent oxygen and active oxygen produced from ozone contained in the fine air bubble groups. Impurities are oxidized, reduced and sterilized or bonded to be removed by the repeated contact of successively formed nascent oxygen and active oxygen with the stirred liquid to be treated. By this method, the liquid to be treated is successively aerated by the ozone-containing fine air bubble groups and stirred in the treatment tank, the fine air bubble groups are irradiated with ultraviolet rays from the ultraviolet lamp to efficiently form active oxygen and the like from ozone of the fine air bubble groups and impurities are reacted with active oxygen and the like to be separated and removed. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for purifying a liquid such as drinking water, industrial water, light oil, heavy oil or waste oil using ultraviolet light.
[0002]
[Prior art]
Conventionally, as a method of treating this kind of liquid, particularly water, a method of decomposing and removing harmful substances in water by accelerated oxidation while irradiating ozone into water and irradiating ultraviolet rays or the like is known. is there.
[0003]
For example, it is intended to purify and sterilize water by increasing the amount of oxygen dissolved in water. Ozone or a mixed gas of ozone and air is blown into water to form air bubbles, and the air bubbles are irradiated with ultraviolet light. Irradiates 240 to 310 nm to generate ozone into singlet oxygen, and then irradiates visible light 600 to 650 nm, near infrared 1200 to 1300 nm or laser light individually or simultaneously or sequentially to generate excited singlet oxygen electromagnetic waves. A method for producing dissolved oxygen in water using transition to ground state oxygen by stimulated release has been known (see Patent Document 1).
[0004]
By performing the treatment in this way, the contaminated water is sterilized and purified, and not only can dissolved oxygen be increased to contribute to the cultivation of fish and shellfish, but also industrial water and the like are purified.
[0005]
Further, for example, water to be treated is introduced into a reaction tower having an ultraviolet lamp having a wavelength of 254 nm, while ozone is generated from an oxygen-enriched gas by an ozone generator, and the ozone is blown into the water to be treated in the reaction tower. In addition, a water treatment method is known in which the water to be treated in the reaction tower is circulated to a circulation line of the water to be treated having an ultraviolet treatment tower having an 185 nm wavelength ultraviolet lamp in the middle thereof (see Patent Document 2).
[0006]
According to the present invention, the dissolved oxygen which has been discharged without being used in the conventional combined ozone / ultraviolet ray-assisted oxidation treatment technology can be converted into ozone, and hydroxy radicals can be generated from the ozone. In addition, it is possible to greatly improve the decomposition efficiency of hardly decomposable environmental trace harmful substances such as environmental hormones and dioxins.
[0007]
[Patent Document 1]
JP-A-11-114588 (pages 2 to 4, FIG. 1)
[Patent Document 2]
JP-A-2002-210479 (pages 2 to 4, FIG. 1)
[0008]
[Problems to be solved by the invention]
However, in the invention described in Patent Document 1, the ozone-containing bubbles formed in water are irradiated with ultraviolet rays to generate ozone into singlet oxygen, and then any of visible light, near-infrared light, or laser light is used. Is required to convert singlet oxygen to ground state oxygen and dissolve it in water.However, in a purification tower containing water to be actually treated, water is applied from the bottom to the top. And an ultraviolet lamp and a two-stage halogen lamp are provided in the middle of the process, and the irradiation of light is performed in a plurality of stages to increase dissolved oxygen, and sterilization is performed, but impurities such as dissolved organic matter are dissolved. However, there is a problem that the fluid is discharged as it is without being removed in the purification tower, and the purification treatment is not substantially performed.
[0009]
Further, in the invention described in Patent Document 2, the water to be treated is introduced from the top of the reaction tower having an ultraviolet lamp, and ozone is blown into the water to be treated from the bottom side. A circulation line is provided, and an ultraviolet treatment tower having an ultraviolet lamp is provided in the middle of the circulation line, and the water to be treated is circulated between the reaction tower and the ultraviolet treatment tower. By generating radicals, it is possible to significantly improve the efficiency of decomposing environmentally harmful substances such as environmental hormones and dioxins, which are difficult to decompose in the environment. In this case, the liquid is discharged directly from the bottom of the reaction tower without being removed, and there is still a problem that substantial purification treatment has not been performed. To have.
[0010]
Therefore, the conventional purification treatment has a problem that must be solved to effectively remove impurities or unnecessary substances dissolved in the treatment liquid.
[0011]
[Means for Solving the Problems]
The present invention as a specific means for solving the above-mentioned problems of the conventional example is a method for purifying a liquid with ozone, and stores a required amount of the liquid to be processed in a processing tank in which an ultraviolet lamp is disposed. Then, a mixed gas of ozone and air is sequentially aerated in a state of fine bubbles from the bottom side in the processing tank and continuously supplied, and the liquid to be processed is brought into contact with stirring, and the finely aerated fine particles are sequentially aerated. The bubbles are irradiated with ultraviolet rays to generate nascent oxygen and active oxygen sequentially from ozone contained in the fine bubbles, and the repetition of the nascent oxygen, active oxygen, and the liquid to be treated which are sequentially generated is repeated. An object of the present invention is to provide a method for purifying a liquid, wherein impurities are removed by redox, sterilization, or binding by contact.
[0012]
In the present invention, an internal processing cylinder having water permeability is provided for guiding a group of microbubbles in the processing tank and convection of the water to be treated; the liquid to be treated is drinking water, industrial water, light oil or heavy oil. And that the size of the microbubbles is in the range of 50 to 200 μm as additional requirements.
[0013]
In the method for purifying liquid according to the present invention, in the internal processing cylinder in the processing tank, fine bubbles containing ozone are sequentially aerated to the liquid to be processed, and the liquid to be processed is brought into contact with the liquid while being stirred, and ultraviolet rays are irradiated. Ultraviolet light is emitted from the lamp to efficiently generate active oxygen and the like from the ozone contained in the microbubble group and react with the impurities contained in the liquid to be treated to separate them. In addition, the impurities separated in the treatment tank , And a purified and clean liquid can be taken out.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, the present invention will be described in detail based on specific embodiments.
The first embodiment of the present invention describes a method for purifying, for example, river water or groundwater as drinking water or industrial water as a liquid to be purified. Even if it is called river water or groundwater, it varies depending on the region and can be used as drinking water as it is, or there are cases where impurities such as various organic substances dissolve or mix in and become polluted and do not become industrial water. The present invention is a method of purifying such a contaminated liquid.
[0015]
First, the purifying apparatus used in the purifying process shown in FIG. 1 includes a processing tank 1 in which a liquid to be processed is stored, and an ozone generator 2, and a bottom pedestal in the processing tank 1. An inner processing tube 4 is disposed via the inner processing tube 3, a lid member 5 is disposed on the upper portion of the inner processing tube 4, and an ultraviolet lamp 6 is attached to a central portion of the lid member 5 so as to hang down. It is disposed in the processing tube 4.
[0016]
In this case, the internal processing cylinder 4 is formed of, for example, a stainless steel punched metal plate or a mesh so that the liquid can freely pass therethrough, and a diffuser 7 as a bubble generating member is provided at the bottom thereof. The internal processing cylinder 4 guides and raises the air bubbles generated by the diffuser 7 and generates convection in the liquid to be processed inside as the air bubbles rise, so that the whole is uniformly stirred. For example, a diffuser 7 is attached to the bottom side surface of the processing tank 1 so that bubbles can be jetted from the side surface to generate convection in the liquid to be processed. The internal processing tube 4 may not always be required if the device 5 can be attached by an appropriate supporting means.
[0017]
On the side surface of the processing tank 1, drain valves 8 and 9 are provided at the upper end level and the lower end level of the internal processing cylinder 4, respectively, and a drain valve 10 is provided near the bottom of the processing tank 1.
[0018]
The inside of the ozone generator 2 is partitioned into a pump chamber 12 and an ozone chamber 13 by a partition wall 11. The pump chamber 12 is equipped with an air pump 14, which can take in outside air and supply it to the ozone chamber 13. It has become. A cover member 15 is detachably and hermetically sealed in the ozone chamber 13. An ultraviolet lamp 16 is attached to the center of the cover member 15 in a hanging state, and the ultraviolet lamp 16 is disposed in the ozone chamber 13. Is established. The air supplied to the ozone chamber 13 has been cleaned through a filter.
[0019]
The ozone chamber 13 and the diffuser 7 disposed at the bottom of the internal processing cylinder 4 in the processing tank 1 are connected by a pipe 17, and the air containing ozone generated in the ozone chamber 13 is supplied to the pipe 17 and the pipe 17. It is configured to be supplied into the processing tank 1 via the diffuser 7. Incidentally, the wavelength of the ultraviolet lamp 6 provided in the processing tank 1 is 253.7 nm, and the wavelength of the ultraviolet lamp 16 provided in the ozone chamber 13 is 184.9 nm.
[0020]
In the processing tank 1 of the processing apparatus thus configured, a predetermined amount of water containing impurities as a liquid to be processed, that is, the amount of water 20 to be processed, for example, an amount reaching the upper end of the inner processing tube 4 is stored. The ultraviolet lamp 6 in the ozone generator 2 is turned on while the ultraviolet lamp 16 is turned on, and the air pump 14 is driven to send air into the ozone chamber 13. The irradiation produces and converts mostly to ozone.
[0021]
The mixed gas of ozone and air generated in the ozone chamber 13 is supplied to the diffuser 7 via the pipe 17, and is aerated to the fine bubble group by the diffuser 7 and supplied to the internal processing cylinder 4. In this case, the fine bubbles have a diameter of 1 mm or less, preferably in the range of 50 to 200 μm, and are fine enough that the bubbles can be visually recognized in a substantially emulsified state when aerated in the water 20 to be treated. To As a device for generating fine bubbles, for example, a commercially available MBT-20 type unit (manufactured by Maruhachi Pump Co., Ltd.) was used.
[0022]
The gaseous mixture of ozone and air rises inside the internal processing cylinder 4 in a state of being aerated to the fine bubbles. During this time, the ozone in the bubbles is irradiated with the ultraviolet lamp 6, and the ozone in the bubbles becomes nascent oxygen and active oxygen. Generate At this time, since the microbubble group has a very small diameter, the contact area becomes large and the ascending speed becomes relatively slow, so that the contact time with the water 20 to be treated and the ultraviolet irradiation time are lengthened, and an efficient reaction is achieved. Processing becomes possible.
[0023]
The nascent oxygen generated in water causes a hydrogen abstraction reaction of water (H ₂ O) to generate a hydroxyl radical (.OH). The active oxygen becomes ground state oxygen (O ₂ ) by interaction with water (H ₂ O).
[0024]
In short, in reaction with the nascent oxygen and active oxygen, singlet oxygen ( _'O 2); hydrogen peroxide _{(H 2 O} 2); hydroxy radicals (· OH) (hydroxyl group); superoxide _{(O 2} ^over) In particular, hydroxyl radicals are extremely reactive radicals, which are reactive oxygen radicals that react with the first encountered molecule and receive electrons to become OH ^, which oxidizes amino acid residues in cells. There is. In addition, hydrogen peroxide is a reactive oxygen species that is always present in the living body, although it is in a trace amount, and has no strong bactericidal activity, but can pass through cell membranes and reacts with metal ions present in a very small amount in the living body. OH), which is involved in the bactericidal action, thereby oxidizing the cellular components of organic matter, causing oxygen damage and killing bacteria present in the water.
[0025]
Further, hydrogen is extracted from hydrogen and water attached to organic substances (such as bacteria and their dead bodies, and stains due to proteins, etc.) from the hydrogen abstraction reaction of nascent oxygen generated in water, and new water (H ₂ O) is generated. Or cause a radical chain reaction to produce new oxygen.
[0026]
Therefore, the mixed gas of ozone and air supplied into the internal processing cylinder 4 of the processing tank 1 rises in a state where it is exposed to the fine bubble group, so that the water to be processed 20 is inevitably as shown by the arrow a. The ozone in the microbubble group which is successively supplied and agitated by the convection is irradiated with the ultraviolet lamp 6 to cause the above-described reaction, so that the organic matter, protein, Water is purified by sequentially performing oxidative decomposition of ammonia and the like, sterilization and deodorization of harmful bacteria, pathogenic bacteria, viruses, and the like. In addition, the rising microbubble group is not immediately released into the atmosphere, but is suppressed from being released by the lid member 5 provided on the upper part of the inner processing cylinder 4, so that the contact with the water 20 to be treated is prolonged. It is maintained and the residual ions disappear.
[0027]
Then, the lightly oxidized and decomposed substance (frog or scum) rises with air bubbles and floats on the surface of the water to be treated 20, and the heavier one precipitates at the bottom of the treatment tank 1. After the treatment for a required time, suspended matter on the water surface is drained and removed by opening the drain valve 8, the treated water 20 is taken out by opening the drain valve 9, and the scum accumulated at the bottom is opened by opening the drain valve 10. Then, the water to be treated 20 remaining at the bottom may be taken out while stirring.
[0028]
In this case, the time after the required time treatment is different depending on the degree of contamination of the water to be treated and the amount. According to an example of an experiment, for example, an experimental apparatus using a treatment tank containing 200 liters is used to test the Tama River. Approximately 180 liters of water collected in the downstream area (near Maruko Bridge) was treated by supplying a mixed gas of ozone and air at a rate of about 0.5 m ³ per minute. Almost no odor. Then, a slight frog was confirmed on the surface of the water, and a slight scum precipitated on the bottom.
[0029]
Therefore, if the degree of dirt is small, the same amount can be used, or if the processing amount is small, the processing can be performed in a shorter time. Conversely, if the degree of dirt is large, the processing can be performed with the same amount. Will be hung.
[0030]
In any case, the water thus treated is purified to almost harmless state, depending on the degree of dirt before the treatment, and can be used as drinking water, industrial water, etc. In this case, the wastewater can be drained without harming the environment.
[0031]
Next, as a second embodiment, for example, light oil for fuel will be described as a processing liquid. As the processing apparatus used for the processing, the same apparatus as that of the first embodiment is used, and the same processing method is performed.
[0032]
That is, a required amount of light oil is put into the processing tank 1, the ultraviolet lamp 6 is turned on, the ultraviolet lamp 16 in the ozone generator 2 is turned on, and the air pump 14 is driven to send air into the ozone chamber 13. Most of the air is converted into ozone by irradiation of the ultraviolet lamp 16 in the ozone chamber 13.
[0033]
Then, a mixed gas of ozone and air generated in the ozone chamber 13 is supplied to the diffuser 7 via the pipe 17, and is aerated to the group of fine bubbles by the diffuser 7 and supplied to the internal processing cylinder 4.
[0034]
The gaseous mixture of ozone and air rises inside the internal processing cylinder 4 in a state of being aerated to the fine bubbles. During this time, the ozone in the bubbles is irradiated with the ultraviolet lamp 6, and the ozone in the bubbles becomes nascent and active oxygen. Generate
[0035]
As a component of light oil, there are various hydrocarbon mixtures such as paraffin, cycloparaffin, and aromatic, and the hydrocarbon forms a carbon skeleton of an organic compound by linking tetravalent carbon atoms to each other in a chain or ring. The hydrogen atoms are bonded to the surplus nuclei of the carbon atoms forming the carbon skeleton, and about 1% of sulfur (S) and some impurities are mixed therein.
[0036]
Therefore, the mixed gas of ozone and air supplied into the internal processing cylinder 4 of the processing tank 1 rises in a state of being aerated to the fine bubble group, whereby the light oil is inevitably agitated, and the fine bubbles sequentially supplied are supplied. The ozone in the group undergoes the above-mentioned reaction upon being irradiated by the ultraviolet lamp 6, so that the impurities in the light oil are oxidized and floated in the form of frog while being stirred, and sulfur and singlet oxygen of ozone are floated. (′ O ₂ ) is bound to form a scum and precipitate.
[0037]
After the required time treatment, the suspended matter on the water surface is discharged and removed by opening the valve 8, the treated light oil is opened and taken out by opening the valve 9, and the scum accumulated at the bottom is opened by opening the valve 10 and the light oil remaining at the bottom is opened. What is necessary is just to take it out while stirring it together. Then, light oil containing frog and scum can be used after being filtered with a filter, or can be used as so-called kerosene.
[0038]
When the light oil thus treated is used, for example, as a fuel for a vehicle equipped with a diesel engine, the amounts of CO ₂ and soot in the flue gas are significantly reduced, and the effect of the fuel on environmental pollution is reduced. Because Further, in the second embodiment, the description has been made with respect to light oil, but the present invention is not limited to this. For example, kerosene or heavy oil can be purified as a matter of course.
[0039]
【The invention's effect】
As described above, the method for purifying a liquid according to the present invention is a method for purifying a liquid with ozone, and stores a required amount of the liquid to be processed in a processing tank in which an ultraviolet lamp is disposed. Then, a mixed gas of ozone and air is sequentially aerated in a state of fine bubbles from the bottom side in the processing tank and continuously supplied, and the liquid to be processed is brought into contact with stirring, and the finely aerated fine particles are sequentially aerated. The bubbles are irradiated with ultraviolet rays to generate nascent oxygen and active oxygen sequentially from ozone contained in the fine bubbles, and the repetition of the nascent oxygen, active oxygen, and the liquid to be treated which are sequentially generated is repeated. Impurities are redox, sterilized or combined to remove impurities by contact.In the treatment tank, fine bubbles containing ozone are sequentially aerated to the liquid to be treated, and the liquid to be treated is brought into contact with the liquid while stirring. At the same time, ultraviolet rays are emitted from an ultraviolet lamp to efficiently generate active oxygen and the like from the ozone of the microbubble group, and can be separated by reacting with impurities. Further, the separated impurities are removed and purified in the processing tank. It has an excellent effect that a clean liquid can be taken out.
[Brief description of the drawings]
FIG. 1 is an explanatory view schematically showing a processing apparatus for performing a liquid purification processing method according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Processing tank 2 Ozone generator 3 Base part 4 Inner processing cylinder 5, 15 Lid member 6, 16 Ultraviolet lamp 7 Diffuser 8, 9, 10 Drain valve 11 Partition wall 12 Pump room 13 Ozone room 14 Air pump 17 Pipe 20 Liquid (water)
a Arrow indicating liquid stirring direction

Claims (4)

A method for purifying a liquid with ozone,
A required amount of liquid to be processed is stored in a processing tank in which an ultraviolet lamp is disposed,
A mixed gas of ozone and air is sequentially aerated in a state of fine bubbles group from the bottom side in the processing tank to be continuously supplied and brought into contact with the liquid to be processed while stirring,
Irradiating ultraviolet rays to the microbubbles that have been sequentially aerated to generate nascent oxygen and active oxygen sequentially from ozone contained in the microbubbles,
A method for purifying a liquid, characterized in that impurities are oxidized and reduced, sterilized or combined to remove the impurities by repeatedly contacting the nascent oxygen, the active oxygen, and the liquid to be treated which are being stirred. The liquid purification treatment method according to claim 1, wherein an internal treatment tube having water permeability is provided in the treatment tank to guide the group of fine bubbles and to convect the water to be treated. The liquid to be treated is
3. The method for purifying a liquid according to claim 1, wherein the method is drinking water, industrial water, light oil, heavy oil, or waste oil. 3. The method for purifying liquid according to claim 1, wherein the size of the fine bubbles is in the range of 50 to 200 [mu] m.

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