JP2002177947A - Dissolved ozone removal equipment - Google Patents

Abstract

(57) [Problem] To provide a small-sized apparatus for removing dissolved ozone, which requires no maintenance, has low initial cost and running cost, and has a small size. The dissolved ozone removing apparatus of the present invention has a water supply port 2 and a drain port 3 connected to a pipe for sending dissolved ozone water, and a contraction section 3 is provided in the middle of the water supply port and the drain port. A gas mixing pipe 1 provided with a gas injection section 4 for injecting a gas not containing ozone into the contraction section, and a gas release valve 7 at a stage subsequent to the gas mixing pipe.
And a gas-liquid separation tank 6 having a gas-liquid separation tank. The ozone-free gas is injected into the ozone water from a gas injection unit, and the gas-liquid separation tank separates the ozone-containing gas and water to remove dissolved ozone. It has a configuration. Further, a gas-liquid mixing device may be provided between the gas mixing pipe and the gas-liquid separation tank.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an apparatus for removing dissolved ozone from ozone water in water treatment using ozone.

[0002]

2. Description of the Related Art Conventionally, there are mainly three methods for removing dissolved ozone in ozone water. The first is an adsorption method using activated carbon. FIG. 3 is a configuration diagram showing a conventional dissolved ozone removing apparatus using activated carbon. The ozone water is introduced into the dissolved ozone removal tank 10 filled with activated carbon, and is discharged after passing through the activated carbon filling section 11. Dissolved ozone is adsorbed on the activated carbon surface when passing through the activated carbon filling unit 11,
Removed from water. The second is a method using ultraviolet irradiation. FIG. 4 is a configuration diagram showing a conventional method of decomposing and removing dissolved ozone by ultraviolet irradiation. The dissolved ozone removal tank 10 is provided with an ultraviolet lamp 12 connected to a power supply 13. The ozone water is irradiated with ultraviolet rays in the dissolved ozone removal tank 10 and decomposed into oxygen. Third is a method of diffusing gas from a diffuser tube. FIG. 5 is a configuration diagram showing a conventional method for removing dissolved ozone by gas aeration (Japanese Patent Laid-Open No. 6-71273). The dissolved ozone removal tank 10 is provided with an air diffuser 14, and the blower 15 is connected to the air diffuser 14. A gas that does not contain ozone is sent to the air diffuser 14 by the blower 15 and is diffused into water. Since the gas diffused into the water does not contain ozone, dissolved ozone in the water is removed to the gas phase.

[0003]

However, the prior art has the following problems. 1) In the case of adsorption removal by activated carbon, the adsorption ability of activated carbon decreases with the passage of time, so that maintenance such as periodic inspection and replacement is required. 2) In the case of decomposition and removal by ultraviolet rays, maintenance such as periodic inspection and replacement is necessary because the ultraviolet lamp has a service life. Further, since the ultraviolet lamp is expensive, the initial cost is large. In addition, since ultraviolet rays must be constantly emitted, running costs increase. 3) When dissolving ozone is removed by diffusing gas from the air diffuser, the blower for blowing must be constantly operated, which increases running costs. In addition, a space for installing a blower for blowing air is required separately from the dissolved ozone removal tank, so that it is difficult to reduce the size of the equipment. Therefore, an object of the present invention is to provide an apparatus that does not require maintenance, has low initial cost and running cost, and removes dissolved ozone with a small facility.

[0004]

In order to solve the above-mentioned problems, the present invention has a water supply port and a water discharge port connected to a pipe for supplying dissolved ozone water, and the water supply port and the water discharge port are connected to each other. A gas mixing pipe provided with a gas injection section for injecting a gas containing no ozone into the contraction section, and a gas-liquid separation tank having a gas release valve at a stage subsequent to the gas mixing pipe, The gas containing no ozone is injected into the ozone water from the gas injection unit, the ozone-containing gas and water are separated by the gas-liquid separation tank, and the dissolved ozone is removed. Further, a gas-liquid mixing device may be provided between the gas mixing pipe and the gas-liquid separation tank.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. (First Embodiment) FIG. 1 shows a first embodiment of a dissolved ozone removing apparatus according to the present invention. In the figure, 1 is a gas mixing pipe, 2 is a water supply port, 3 is a contraction section, 4 is a gas injection section, 5 is a drain port, 6 is a gas-liquid separation tank, 7 is a gas release valve, and 8 is an ozone gas decomposition tank. . The gas mixing pipe 1 includes a water supply port 2 for introducing ozone water, a storage section 3 having a reduced inner diameter, a gas injection section 4 for injecting a gas containing no ozone, and discharging ozone water containing a gas containing no ozone. Drain 5 Air was used as the ozone-free gas. Next, the operation will be described. Now, the ozone water is pumped from the water supply port 2 of the water pipe 1 to the contraction section 3. Then, the flow rate of the ozone water increases in the contraction section 2, and the static pressure of the gas injection section 4 becomes lower than the atmospheric pressure. By this reduced pressure, gas is sucked from the gas injection unit 4. When ozone water and a gas that does not contain ozone are mixed, the dissolved ozone concentration and the ozone concentration in the gas phase are not equilibrium.
Dissolved ozone moves into the gas phase and is removed from the water. A mixed fluid of water and gas containing ozone from which dissolved ozone has been removed is discharged from the drain port 5 of the water supply pipe 1 and introduced into the gas-liquid separation tank 6. In the gas-liquid separation tank 6, gas and water are separated vertically, and the water is discharged from the lower part of the gas-liquid separation tank 6. On the other hand, the gas containing ozone is introduced into the ozone gas decomposition tank 8 through the gas release valve 7 provided at the top of the gas-liquid separation tank 6,
It is decomposed into harmless oxygen by well-known thermal decomposition and decomposition using a catalyst and is discharged to the atmosphere. In this embodiment,
Although air is used as the gas to be injected, the present invention is not limited to this, and an inert gas such as N ₂ gas or Ar gas may be used as long as it does not contain ozone. Further, the gas containing ozone discharged from the gas-liquid separation tank 6 may be introduced into another ozone treatment facility without being decomposed and reused. (Second Embodiment) FIG. 2 is a configuration diagram of a dissolved ozone removing apparatus according to a second embodiment of the present invention. In the figure, 9
Is a gas-liquid mixing device, which has a mixing element built in the piping. By providing the gas-liquid mixing device 9 after the water pipe 1, the mixing efficiency of gas and ozone water is improved, and the removal rate of dissolved ozone can be improved.

[0006]

As described above, according to the present invention,
Since the gas mixing tube having the contraction section and the gas injection section and the gas-liquid separation tank are provided, maintenance is not required, the initial cost is small, and the equipment can be downsized. In addition, since no ultraviolet lamp or blower is used, running costs can be reduced.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a dissolved ozone removing device according to a first embodiment of the present invention.

FIG. 2 is a configuration diagram of a dissolved ozone removing device according to a second embodiment of the present invention.

FIG. 3 is a configuration diagram of a conventional dissolved ozone removing device using activated carbon.

FIG. 4 is a configuration diagram of a conventional method for removing dissolved ozone using ultraviolet rays.

FIG. 5 is a configuration diagram of a conventional dissolved ozone removing device using a diffuser tube.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Gas mixing pipe 2 Water supply port 3 Shrinkage part 4 Gas injection port 5 Drainage port 6 Gas-liquid separation tank 7 Gas release valve 8 Ozone gas decomposition tank 9 Gas-liquid mixing device 10 Dissolved ozone removal tank 11 Activated carbon filling unit 12 Ultraviolet lamp 13 Power supply 14 Air diffuser 15 Blower for blower

Claims (2)

[Claims] 1. A water supply port connected to a pipe for supplying dissolved ozone water and a drain port, a contraction section is provided in the middle of the water supply port and the discharge port, and a gas containing no ozone is supplied to the contraction section. A gas mixing pipe provided with a gas injection section to be injected, and a gas-liquid separation tank having a gas release valve at a stage subsequent to the gas mixing pipe, and the ozone-free gas is injected into the ozone water from the gas injection section. And a gas-liquid separation tank for separating gas and water containing ozone to remove the dissolved ozone. 2. The dissolved ozone removing apparatus according to claim 1, wherein a gas-liquid mixing device is provided between the gas mixing pipe and the gas-liquid separation tank.