JP2666066B2 - Water purification device using ozone - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a water purification apparatus using ozone for purifying, sterilizing, decolorizing, deodorizing, etc. industrial wastewater, domestic wastewater, and various other unclean waters using ozone. About.

[Prior Art] In an ozone water purification apparatus, a gas containing ozone generally generated by an ozonizer (hereinafter, referred to as an ozonized gas).
Is brought into contact with unpurified water to absorb ozone into the unpurified water,
Ozone is used to oxidize and decompose various inorganic and organic impurities in unpurified water by the strong oxidizing action of dissolved ozone, and to sterilize, deodorize, and decolorize it. Is water cooled. In this case, the water cooling section of the ozonizer and the septic tank for purifying unpurified water with ozone are configured as separate units. This is the only reason that the ozonizer of the prior art has an ozone generating unit integrally formed with the water cooling unit, and the purifying tank for water using ozone has been manufactured as a single unit separate from the ozonizer. Therefore, the water purification apparatus using ozone is large and complicated, and is extremely expensive.

[Problems to be Solved by the Invention] The present invention provides a conventional ozone water purification apparatus, in which the septic tank and the ozonizer water cooling unit are configured as separate units, resulting in an increase in the size and complexity of the apparatus. It is intended to solve the above problem of high price.

[Means for Solving the Problems] The present invention solves the above problems by performing water cooling of the ozonizer in the septic tank.

That is, the water purification apparatus using ozone according to the present invention has a surface having an inlet for an oxygen-containing gas, an ozone generator for generating an ozonized gas containing ozone by surface discharge from the material gas, and an outlet for the ozonized gas. A discharge type ozonizer, a power supply for generating a creeping discharge in the ozone generating section, an inlet for unclean water, a holding tank for holding and purifying the unclean water while applying ozone thereto, and clean water. A purifying tank having an outlet of the above, and the mixed water and the ozonized gas are brought into contact with each other to absorb the ozone into the unpurified water, and the ozone is held in the holding tank and purified by the action of ozone to be purified. An ozone water purifier that discharges the purified water to the outside from the purified water outlet, characterized in that the ozone generator is immersed in the retained water of the purification tank and cooled by the retained water. That.

In this case, the absorption of ozone into the unpurified water by the mixed contact of the ozonized gas with the unpurified water may be performed in the holding tank. In this case, in order to accelerate the absorption of ozone, a Raschig ring, a pebble, etc. It is preferable to provide an absorption-promoting element made of a filler, a wire mesh, a multi-port plate, or another resistance material.

Alternatively, ozone can be absorbed into the unpurified water by mixing and contacting the ozonized gas with the unpurified water using a separate and appropriate gas absorbing device. In this case, the gas absorbing device is installed in front of the purification tank. However, it is preferable that the apparatus be housed and arranged in the holding tank of the septic tank because the apparatus is simplified.

In general, ozone water produced by contacting and mixing with ozonized gas contains a large number of gaseous ozonized gas. Therefore, in order to separate the ozone water from ozone water, it is necessary to provide some kind of gas-liquid separation unit. Although any gas-liquid separation device can be used as such a gas-liquid separation unit, a gas space is formed in the upper part of the septic tank, and this is used as a gas-liquid separation unit. It is preferable that the residual ozonized gas be accumulated in the upper gas space and expelled to the outside as appropriate, since the structure of the apparatus is simplified and the residual ozonized gas is generally discharged to the outside. Since it contains ozone that is harmful to the human body and equipment, it is led to an appropriate ozone removal device (hereinafter referred to as an ozone killer) composed of activated carbon for ozone adsorption, an ozone decomposition catalyst, or a heater for ozone pyrolysis. After removing ozone, it is necessary to release it to the outside air.

In addition, since the purified water after purification by ozone generally contains dissolved ozone in many cases, it is activated carbon,
It is desirable to remove the dissolved ozone through a suitable dissolved ozone absorbing device composed of an ozonolysis catalyst or the like, and then release the dissolved ozone to the outside.

The surface discharge type ozonizer used in the present invention is provided with a linear electrode in contact with one surface of a dielectric substrate, and through at least a part of the dielectric substrate (in contact with the other surface of the substrate). Alternatively, when using a surface discharge type ozonizer having a planar electrode disposed at a position facing the linear electrode (embedded in the thickness of the dielectric substrate as described later), Since the surface of the substrate on the side opposite to the side on which the linear electrodes are disposed can be directly water-cooled, cooling of the ozonizer is promoted, and the ozone generation efficiency can be greatly improved and the ozonizer can be downsized.

In particular, the dielectric substrate of the creeping discharge type ozonizer is formed in a cylindrical shape, and the linear electrode is disposed on the inner surface thereof, and the planar electrode is opposed to the linear discharge electrode through at least a part of the substrate. When a cylindrical structure is provided, it is easy to cool the ozone generating portion by immersing it in the water held in the septic tank, and the structure becomes simple, which is extremely preferable.

At this time, when a high-purity alumina ceramic substrate having a purity of 92% or more is used as the material of the dielectric substrate and tungsten is used as the material of the linear electrode and the planar electrode,
The two electrodes can be easily sintered together with the alumina ceramic substrate to form a strong integral structure, and the high thermal conductivity of the high-purity alumina ceramic enhances the cooling effect, which is particularly advantageous.

[Operation] As a result of the above-described features and configuration, the present invention can perform water cooling of the ozonizer using the retained water in a purification tank that purifies water with ozone.

[Embodiments] The features and configurations of the present invention will now be described with reference to embodiments and drawings.

FIG. 1 is a longitudinal sectional view showing one embodiment of the present invention. Reference numeral 1-a denotes a purification tank, in which a holding water 1 is filled in a holding tank 1-b, into which a cylindrical creeping discharge type ozonizer 3 and a gas absorbing device 4 for absorbing ozonized gas into unpurified water. And a dissolved ozone absorber 5 for removing dissolved ozone remaining in clean water are inserted from above. Therefore, the outer surface of the cylindrical creeping discharge type ozonizer 3 comes into contact with the retained water and is cooled strongly.

Here, the cylindrical creeping discharge type ozonizer 3 of this example has a vertical section shown in FIG. 2 and a horizontal section shown in FIG. 3 within the wall thickness of a cylinder 6 made of alumina ceramic having a purity of 92%. And a plurality of parallel linear electrode groups 9 are arranged on the inner surface 8 of the cylinder 6 so as to face the induction electrode 7 via the alumina ceramic layer 10. . 11
Reference numerals -a and 11-b denote end annular conductors connected to both ends of the linear electrode group 9, and 7, 9, 11-a and 11-b are made of tungsten, and the alumina ceramic cylinder 6 and integrally formed by sintering. 12,
Numeral 13 designates a disc-shaped end plate for airtightly and watertightly sealing the upper and lower portions of the alumina ceramic cylinder 6, and the upper end plate 12 is made of an insulating material. Reference numeral 14 denotes a high-frequency high-voltage power supply, which applies a high-frequency high voltage between the electrodes 7 and 9 via cables 15-a and 15-b, and the cylindrical inner surface of the linear electrode group 9 A creeping discharge is generated along 8. 16 is for supplying a raw material gas containing oxygen to the ozonizer 3 such as an oxygen cylinder, an air cylinder, a dry air source combining a dehumidifier and a compressor, or an oxygen-enriching air source combining an oxygen-enriching device and a compressor. Source gas source. The source gas is piped from the source gas source 16.
17, is supplied to a gas inlet 19 of the ozonizer through a valve 18, and then passes through a raw material gas introduction pipe 20 extending downward along the central axis of the ceramic cylinder 6 from the lower end opening 21 thereof. 6 to the interior 22. In the process in which the source gas rises through the gap between the source gas introduction pipe 20 and the inner surface 8 of the ceramic cylinder 6, a part of oxygen is converted to ozone by the action of the creeping discharge, and Is generated. This ozonized gas is supplied from a gas outlet 23 through a pipe 24 and a valve 25 to the gas absorbing device 4.
Is supplied to the inlet 26. Reference numeral 27 denotes an unpurified water generating source, and the unpurified water discharged therefrom is supplied to an inlet 26 of the gas absorbing device 4 through a pipe 28, a valve 29, and a filter 30.

The ozonized gas and the unpurified water supplied from the inlet 26 into the gas absorbing device 4 are subjected to a strong gas-liquid agitation contact action therein, and ozone is effectively absorbed into the unpurified water to generate ozone water. . The generated ozone water is discharged from the lower outlet 31 of the gas absorbing device 4 into the holding tank 1-b in a state containing many fine bubbles of the residual ozonized gas. The gas absorbing device 4 may have any principle and structure,
In the present embodiment, a structure in which a large number of torsion wing elements 33 are filled in a cylindrical case 32 is used. The cylindrical case 32
The adjacent torsional wing elements inside are twisted in the opposite direction, and both wing edges at the contact part are arranged so as to be orthogonal. Each time the torsion blade element moves from the torsion blade element to the next torsion blade element, the direction of rotation is strongly reversed, effective gas-liquid mixing contact is performed, ozone is absorbed in the retained water in a short time, and the specified concentration It becomes ozone water containing dissolved ozone. In the interior 34 of the holding tank 1-b, the unpurified water is purified by the strong oxidizing action of the ozone water to become purified water.

In this case, the microbubbles of the residual ozonized gas rise by buoyancy, reach the water surface 36 of the retained water at the lower part of the upper gas space 35, rupture there and undergo gas-liquid separation, and remain in the gas space 35 as residual ozonized gas. accumulate.

Reference numeral 5 denotes a dissolved ozone absorbing device also serving as a discharge pipe for the clean water, which is located at a position farthest from the gas absorbing device 4, and is filled with activated carbon 37 for absorbing ozone. The water inlet 38 at the lower end thereof is connected to the floor surface 39 of the holding tank 1-b.
The clean water which is located just above and which does not contain any air bubbles after the cleaning is sucked from the clean water. In the process of passing the clean water through the dissolved ozone absorber 5, the residual dissolved ozone is converted into the activated carbon.
After being adsorbed and removed by 37, the water is discharged from the purification tank 1-a to the outside via a pipe 40 and a valve 41.

42 is an outlet for residual ozonized gas, a pipe 43 and a control valve 44
The residual ozonized gas is discharged to the outside air through a pipe 46 after the ozone is removed in the ozone killer 45 after the ozone killer 45 is already communicated with the ozone killer 45 through the pipe.

Reference numerals 47 and 48 denote upper and lower liquid level sensors, respectively, which are connected to a liquid level control unit 49, and control the opening of the control valve 44 by output signals thereof. When the liquid level 36 of the retained water rises above the position of the upper sensor 47, the control valve 44 closes to stop the discharge of the residual ozonized gas, and the liquid level 36 of the retained water becomes the lower sensor 48.
When the control valve 44 is lowered beyond the position, the control valve 44 is opened to allow discharge of the residual ozonized gas, the position of the liquid surface 36 of the retained water is kept almost constant, and its entry into the ozone killer 45 is performed. To prevent.

[Effects of the Invention] As a result of the features and configurations described above, the present invention can simultaneously absorb ozonized gas into unpurified water, purify it with ozone, and water-cool a creeping discharge type ozonizer in the same purification tank. , Simplification, and a significant reduction in price have been achieved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of one embodiment of the present invention, FIG. 2 is a longitudinal sectional view of a creeping discharge type ozonizer used in this embodiment, and FIG.
The figure is a cross-sectional view thereof. In the figure, 1-a: purification tank 1-b: holding tank 2: holding water 3: cylindrical surface discharge type ozonizer 5: dissolved ozone absorber 6: ceramic cylinder 7: induction electrode 8: inside Surface 9: Linear electrode group 10: Ceramic insulating layer 11-a, 11-b: End annular conductor 12: Upper end plate 13: Lower end plate 14: High-frequency high-voltage power supply 15-a, 15 −b Cable 16 Source gas source 17,24,28,40−, 43,46 Pipe 18,25,29,41 Valve 19 Gas inlet 20 Source gas introduction pipe 21 ... Opening 22 ... Inside the ozonizer 23 ... Gas outlet 26 ... Gas absorber inlet 27 ... Source of unclean water 30 ... Filter 31 ... Gas / water outlet 32 ... Cylindrical case 33 ... Twist Element 34: Inside the holding tank 35: Gas space 36: Liquid level 37: Activated carbon 38: Water inlet 39: Floor of the holding tank 42: Gas outlet 44 Regulating valve 45 ...... ozone killer 47 ...... upper liquid level sensor 48 ...... lower liquid level sensor 49 ...... liquid level controller element

Claims (4)

(57) [Claims] An ozonizer having an inlet for a source gas containing oxygen, an ozone generator for generating an ozonized gas containing ozone by creeping discharge from the source gas, and an outlet for the ozonized gas. A linear electrode is disposed in contact with one surface, a planar electrode is disposed at a position facing the linear electrode via at least a part of the dielectric substrate, and a cooling unit is disposed on the dielectric substrate. Using a creeping discharge type ozonizer provided in contact with the surface on the side opposite to the side where the linear electrodes are disposed,
The ozone generator is provided with a power source for generating a surface discharge, a purifying tank having an inlet for unpurified water, a holding tank for holding and purifying the unpurified water while applying ozone thereto, and an outlet for clean water. Then, the unpurified water and the ozonized gas are mixed and brought into contact with each other to absorb ozone into the unpurified water, and the ozone is retained in the holding tank and purified by the action of ozone. An ozone water purifying apparatus characterized in that the surface discharge type ozonizer is immersed in water retained in the purifying tank and cooled with the retained water in the water purifying apparatus using ozone discharged from an outlet to the outside. 2. A gas absorbing device for absorbing ozone in said ozonized gas into said unpurified water is provided upstream of said unpurified water inlet of said septic tank, and said gas absorbing device has a gas inlet and a water inlet respectively. The ozonized gas outlet of the creeping discharge type ozonizer communicates with the unpurified water introduction pipe, and the outlet of the gas absorbing device communicates with the unpurified water inlet of the purification tank, so that the ozone contained in the ozonized gas is removed. The ozone water purification apparatus according to claim 1, wherein absorption into purified water is performed by the gas absorption apparatus. 3. The gas absorbing device is housed in the holding tank, and the water inlet of the gas absorbing device also serves as the unpurified water inlet. The ozone water purifying apparatus according to claim 1, wherein an outlet of the ozonized gas is connected to a gas inlet, and an outlet of the gas absorbing device is opened in the holding tank. 4. The surface discharge type ozonizer has a cylindrical dielectric substrate, and the linear electrodes are disposed on the inner surface of the dielectric substrate, and the linear electrodes are disposed through at least a part of the cylindrical dielectric substrate. The ozone water purification apparatus according to claim 3, wherein the ozone water purification apparatus is a cylindrical surface discharge type ozonizer having the planar electrode disposed at a position facing the electrode.