JP4003231B2 - Ozone water treatment equipment - Google Patents

Description

  The present invention uses water and sewage, rainwater, human waste, industrial wastewater, etc. as water to be treated, and maintains high performance for processing such as sterilization, deodorization, decolorization, and decomposition of organic matter with ozone, and also in a narrow space. The present invention relates to a compact ozone water treatment apparatus that can be installed.

In recent years, while the quality of raw water has deteriorated and water has been recycled, treatment methods that purify water using ozone are becoming established.
Ozone generated by the ozone generator has the ability to oxidize and remove dissolved harmful substances dissolved in water with its strong oxidizing power, and not only water and sewage but also rainwater, human waste, industrial wastewater, and pools. It is used for the treatment of various water such as water.
In ozone treatment, bubbles containing ozone are generally dissolved in the water to be treated by an ejector or diffuser and stays for a certain period of time, so that dissolved ozone causes an oxidation reaction with the substance to be removed in the water to be treated, thereby sterilizing the water to be treated.・ Processes such as deodorization / decolorization and decomposition of organic substances.
An example of such a conventional ozone water treatment apparatus is shown in FIG. 4 (see, for example, Patent Document 1).
In the figure, 1 is a treated water supply pump, 2 is treated water, 3 is an ejector, 4 is an ozone generator, 5 is an ozone gas supply line, 6 is a static mixer, 7 is an ozone reaction tower, and 8 is an ozone treated water feed. Line 9 is an exhaust ozone decomposing unit, and 10 is a check valve.
The ozone supply unit 11 includes an ozone generator 4, an ozone gas supply line 5, a check valve 10, and the like, and the ozone dissolution unit 12 includes an ejector 3 and a static mixer 6. The ozone generator 4 is generally composed of an air compressor, a PSA oxygen generator, an ozone generator and the like when oxygen is used as a raw material. The exhaust ozone decomposing unit 9 includes a mist separator and an exhaust ozone decomposing apparatus that remove mist and bubbles contained in the exhaust ozone gas, and includes a method using a catalyst and activated carbon, a high temperature heating method, and the like.
Next, the operation of this ozone water treatment apparatus will be described.
The treated water 2 is pumped to the ejector 3 by the treated water supply pump 1, and the introduction portion of the ozone gas becomes negative pressure due to the dynamic pressure difference generated when passing through the orifice inside the ejector 3. At this time, the ozone gas generated by the ozone generator 4 is introduced into the ejector 3 through the ozone gas supply line 5 and mixed with the treated water 2. At this time, ozone is absorbed into the water to be treated, and is further stirred and mixed by the static mixer 6. After that, it is introduced into the ozone reaction tower 7 and contacted with ozone for a certain period of time to sterilize, deodorize, decolorize, and decompose organic matter in the treated water, and send it to the subsequent stage through the ozone treated water feed line 8. .
Ozone that is not dissolved in the water to be treated is separated from the water to be treated, detoxified by the exhaust ozone decomposing unit 9, and released into the atmosphere.
The check valve 10 provided in the ozone gas supply line is caused by the backflow of the water to be treated when the operation is stopped or when the ozone gas introduction portion does not become negative pressure due to insufficient dynamic pressure difference in the orifice portion of the ejector. Prevents water from entering the ozone generator.
Japanese Patent Laid-Open No. 11-319859 (2nd page, FIG. 1)

However, in the conventional ozone water treatment apparatus, the ozone dissolving part has the following problems.
The ozone dissolution performance is affected by the dynamic pressure difference in the orifice inside the ejector during water flow. Therefore, the dynamic pressure difference fluctuates due to fluctuations in the flow rate of the water to be treated, and the dissolution performance decreases when the flow rate is too low. On the other hand, when the flow rate is excessive, the pressure loss when passing through the orifice increases, and the energy efficiency of the water supply pump to be treated decreases.
In addition, when the flow rate of the water to be treated is less than the flow rate according to the performance of the ejector, the dissolution performance of the ejector is remarkably reduced. Therefore, it is difficult to obtain a stable treatment efficiency when the flow rate is less than the specified amount of the ejector. .
Therefore, the present invention has been made in view of such problems, and is small in size, has no backflow of water to be treated, is highly reliable, has high ozone dissolving performance and high reaction efficiency, and has energy efficiency of pump equipment. An object of the present invention is to provide a good ozone water treatment apparatus.

In order to solve the above problems, the present invention is configured as follows.
(1) The ozone water treatment apparatus according to claim 1 is an ozone supply unit comprising an ozone generator and an ozone gas supply line provided with a check valve, and a water to be treated provided downstream of the treated water supply pump. Decomposes and detoxifies excess ozone undissolved in the water to be treated, an ozone dissolution unit consisting of an ejector connected to the ozone gas supply line and a static mixer that mixes and stirs ozone gas, an ozone reaction tower, and water to be treated In the ozone water treatment apparatus constituted by the waste ozone decomposing unit, the ozone dissolving unit is divided into a water flow branch line that branches the treated water flow line, and a treated water return line that branches from the ozone reaction tower or the subsequent stage. Send the, and passing dewatering valve provided at the confluence between said water flow branch lines the treated water return line, the water to the treated water through water line from downstream of the through draining valve Consists of a Inn, a pressure detecting means for detecting the passage draining the ejector differential pressure across the pressure regulating means and said ejector to adjust the sequentially disposed the pressure pump and the differential pressure downstream of valve, the water to be treated The water flow switching valve is operated in accordance with the flow rate of.
According to this configuration, even if the flow rate of the water to be treated fluctuates, the amount of water that is passed through the ejector can be kept constant, and water that is set to an arbitrary dynamic pressure difference is possible and high ozone flow rate is maintained. Dissolution performance is obtained. Furthermore, even when the flow rate of the water to be treated is less than the amount of water corresponding to the performance of the ejector, the treated water is introduced into the ejector by operating the water flow switching valve and introducing the treated water from the treated water return line. The amount of water flow can be kept constant. That is, it is possible to stably maintain high ozone dissolution performance regardless of fluctuations in the water to be treated.
(2) The ozone treatment apparatus according to claim 2, wherein the pressure adjusting means is an opening adjusting valve provided in a pipe disposed in front of the ejector or in parallel with the ejector, or an output frequency of the pressurizing pump. This is an inverter to be adjusted.
According to this configuration, it is possible to pass water in which the amount of water to be treated that passes through the ejector and the dynamic pressure difference when passing through the orifice inside the ejector are arbitrarily set. That is, high ozone dissolution performance can be stably maintained.
(3) The ozone treatment apparatus according to claim 3, wherein the static mixer has a structure in which the mixed fluid of the water to be treated and ozone is once branched into two or more directions, and then opposed to collide and merge, or in a pipe The impeller is provided with a structure for forced rotation.
According to this configuration, even when the water to be treated mixed with ozone in the branch line is remixed with the water to be treated in which ozone is not dissolved, ozone is efficiently absorbed into the water to be treated. As a result, the ozone treatment efficiency is improved.

The ozone water treatment apparatus of the present invention has the following effects.
(1) The ozone dissolving part is provided with pressure detecting means before and after the ejector, pressure adjusting means capable of adjusting the differential pressure before and after the ejector, and provided with mixing / stirring means for water to be treated and ozone gas at the subsequent stage of the merging part Therefore, even if the flow rate of the water to be treated fluctuates, the amount of water that is passed through the ejector can be kept constant, and water that is set to an arbitrary dynamic pressure difference can be passed. In addition, by operating the water flow switching valve according to the flow rate of the water to be treated, even when the flow rate of the water to be treated is less than the water volume according to the performance of the ejector, the water flow rate that is passed through the ejector is constant. And high ozone dissolution performance can be stably maintained.

  Embodiments of the present invention will be described below with reference to the drawings.

A first embodiment of the present invention is shown in FIG. FIG. 1 is an overall configuration diagram showing an ozone water treatment apparatus of the present invention. The same parts are denoted by the same reference numerals. The ozone water treatment apparatus according to the present embodiment includes an ozone supply unit 11, an ozone dissolution unit 12, an ozone reaction tower 7, and an exhaust ozone decomposition unit 9. In the figure, 13 is a bypass line, 14 is a gas switching valve, 15 is drainage means, 16 is a treated water passage line, 17 is a water passage branch line, 18 is a treated water return line, 19 is a water passage switching valve, 20 Is a pressure pump, 21 is a pressure adjusting means, 22 is a pressure detecting means, 23 is a mixing / stirring means, and 24 is an inner tube.
The ozone supply part 11 arrange | positions the highest part of the ozone gas supply line 5 which connects the ozone generator 4 and the ejector 3 in a position higher than the water level level at the time of the water full in an ozone reaction tower. Moreover, the gas switching valve 14 is installed in the branch part of the bypass line 13 branched from the ozone gas supply line 5 and the middle part thereof and connected to the exhaust ozone decomposition part 9. The gas switching valve 14 opens between the ejectors during the ozone treatment operation and closes the exhaust ozone decomposing unit. When the operation is stopped, the gas switching valve 14 closes the ejectors and opens the exhaust ozone decomposing unit. Further, a drainage means 15 is provided in the middle of the ozone gas supply line downstream of the ozone generator .

The ozone dissolving part 12 branches the to-be-processed water flow line 16 to which the to-be-processed water 2 is supplied, and provides the water flow branch line 17. Moreover, the treated water return line 18 branched from the back | latter stage of the ozone reaction tower is provided, and the water flow switching valve 19 is installed in the junction. A line that connects the water flow switching valve 19 and the to-be-treated water flow line 16 and sends water from the water flow switching valve 19 toward the to-be-treated water flow line 16 is provided. Further , a pressure pump 20, a pressure adjusting means 21 such as a valve capable of adjusting the opening degree, and the ejector 3 are arranged at the subsequent stage of the water flow switching valve 19 . Further, pressure detection means 22 for detecting the differential pressure before and after the ejector is installed before and after the ejector 3. The subsequent stage is rejoined with the to-be-treated water flow line 16, and the mixing / stirring means 23 is disposed at the joining part or after the joining part.
Next, the operation will be described.
When the flow rate of the water to be treated is equal to or greater than the specified water amount satisfying the performance of the ejector, a part of the water to be treated is pumped by the pressurizing pump 20 through the water flow branch line and introduced into the ejector 3. At this time, the dynamic pressure difference when passing through the ejector 3 is monitored by the pressure detecting means 22, and the optimum differential pressure of 0.05 to 0.15 MPa is set by the pressure adjusting means 21. The pressure adjusting means at this time is a method in which a bypass is provided in front of the ejector or in parallel with the ejector, and a valve is installed in the middle thereof to adjust the opening, or the output frequency of the pressurizing pump 20 is adjusted by an inverter. There is a way.
The treated water mixed with the ozone gas by the ejector joins the treated water flow line 16 again. At this time, the mixing / stirring means 23 installed at the merging section or the subsequent stage of the merging section mixes and stirs more strongly with the main treated water, and ozone is absorbed into the treated water with high efficiency. Such a mixing / stirring means is a method in which the mixed fluid of water to be treated and ozone is once branched into two or more directions and collided by increasing the collision speed from the opposite side, or the impeller is rotated at high speed inside the pipe. There are a method of forcibly shearing gas and liquid, a method of static mixer, and the like.
In addition, when the flow rate of the water to be treated is less than the specified water amount that does not satisfy the ejector performance, the water flow switching valve 19 is operated to open the treated water return line 18 and close the water flow branch line 17. . Thereby, a part of the treated water in the ozone reaction tower is introduced into the ejector through the treated water return line by the set amount of the ejector, and mixing with ozone gas is performed.
According to the present embodiment, the following effects can be obtained.
The ozone dissolving part is provided with a pressure pump, pressure adjusting means, and an ejector, and pressure detecting means are arranged before and after the ejector, and a mixing and stirring means is installed at the junction with the water flow line to be treated or at the subsequent stage. Therefore, even if the flow rate of the water to be treated fluctuates, the amount of water that passes through the ejector can be kept constant, and water can be set at any dynamic pressure difference, resulting in high ozone dissolution performance. It can be maintained stably. In addition, since a water flow branching line and a treated water return line are provided and a water flow switching valve is installed at the junction, even if the flow rate of treated water is less than the water volume corresponding to the performance of the ejector, By operating the switching valve and introducing the treated water from the treated water return line, it is possible to maintain a constant amount of water that is passed through the ejector. That is, it is possible to stably maintain high ozone dissolution performance regardless of fluctuations in the water to be treated.

Schematic of an ozone water treatment apparatus showing Examples 1 to 3 of the present invention Schematic showing a conventional ozone water treatment device

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 To-be-processed water supply pump 2 To-be-processed water 3 Ejector 4 Ozone generator 5 Ozone gas supply line 6 Static mixer 7 Ozone reaction tower 8 Ozone treated water water supply line 9 Waste ozone decomposition part 10 Check valve 11 Ozone supply part 12 Ozone dissolution part 13 Bypass line 14 Gas switching valve 15 Drainage means 16 To-be-treated water passage line 17 Water passage branch line 18 Treated water return line 19 Water passage switching valve 20 Pressure pump 21 Pressure adjustment means 22 Pressure detection means 23 Mixing / stirring means 24 Inner pipe

Claims (3)

An ozone supply unit comprising an ozone generator and an ozone gas supply line provided with a check valve, a treated water flow line provided downstream of the treated water supply pump, an ejector connected to the ozone gas supply line, and ozone gas In an ozone water treatment apparatus composed of an ozone dissolution part composed of a static mixer that is mixed and stirred, an ozone reaction tower, and an exhaust ozone decomposition part that decomposes and detoxifies surplus ozone not dissolved in the water to be treated.
The ozone dissolving part includes a water branch line branched from the treated water flow line, a treated water return line branched from the ozone reaction tower or the subsequent stage, the water branch line, and the treated water return line. And a water supply switching valve provided at a junction of the water supply line, a line for sending water to the treated water flow line from the subsequent stage of the water flow switching valve, and a pressurizing pump sequentially disposed in the subsequent stage of the water flow switching valve. It consists of a pressure detecting means for detecting the ejector differential pressure across the pressure regulating means and said ejector to adjust the pressure, the ozone, characterized by operating the communication draining valve in accordance with the flow rate of the water to be treated Water treatment equipment.   The pressure adjusting means is an opening adjustment valve provided in a pipe disposed in front of the ejector or in parallel with the ejector, or an inverter for adjusting an output frequency of the pressurizing pump. Ozone water treatment equipment. The static mixer is a structure in which the mixed fluid of the water to be treated and ozone is once branched in two or more directions and then opposed and collided and merged, or an impeller is provided in a pipe and forcedly rotated. The ozone water treatment apparatus according to claim 1 or 2.

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