JP5650151B2 - Method for measuring dissolved ozone concentration in ozone water - Google Patents

Description

  The present invention relates to a method for measuring the dissolved ozone concentration of ozone water.

  Conventionally, as disclosed in Patent Document 1, a technique related to a sterilization cleaning apparatus that sterilizes various sterilization objects using ozone water is known. In such a sterilizing and cleaning apparatus using ozone water, ozone water is generated by injecting ozone gas into raw material water (hereinafter referred to as raw water).

  Further, in such a sterilizing and cleaning apparatus using ozone water, a dissolved ozone concentration meter (in the patent document 1, an ozone water monitor) is provided by an ultraviolet absorption method in order to measure the dissolved ozone concentration of ozone water. . The dissolved ozone concentration meter measures the dissolved ozone concentration of ozone water based on the reduction ratio of the amount of ultraviolet light that passes through ozone water, utilizing the property that ozone absorbs ultraviolet light. That is, in the conventional method for measuring dissolved ozone concentration used in a sterilizing and cleaning apparatus using ozone water, as shown in FIG. 11, the amount of transmitted UV light and the amount of ozone after starting ozone gas injection when ozone is not present. Each of the amounts of ultraviolet water transmitted through ozone water is measured, the ratio is obtained, and the dissolved ozone concentration is calculated. Specifically, first, by measuring the amount of ultraviolet light transmitted through the raw water before the ozone gas is injected, the origin of the dissolved ozone concentration (the dissolved ozone concentration is 0 mg / L as a reference when calculating the dissolved ozone concentration). To be determined). That is, the amount of transmitted ultraviolet light during the passage of raw water without ozone is determined as the origin light amount at which the dissolved ozone concentration of ozone water is 0 mg / L (origin). Subsequently, after the origin light quantity is determined, when ozone gas is generated by injecting ozone gas into the raw water, the reduction rate of the amount of ultraviolet light transmitted by the ozone water is measured with reference to the determined origin light quantity, and the ozone water is determined based on the reduction ratio. The dissolved ozone concentration of is calculated.

JP 2006-068095 A

  However, if the raw water contains a substance that changes the amount of UV transmission due to the reaction with ozone, if ozone gas is injected into the raw water to generate ozone water after determining the origin light intensity, the UV light is transmitted under the influence of the substance. The amount fluctuates in the direction of increasing temporarily, and accurate dissolved ozone concentration measurement cannot be performed. Specifically, normally, in ozone treatment for water, impurities that cause water stains are decolorized by ozone, and the transparency of water increases and the amount of ultraviolet light transmitted increases (see FIG. 12A). Part indicated by arrow A). As shown in FIG. 12 (b), the fluctuation in the amount of transmitted ultraviolet light is converted into a dissolved ozone concentration. As a result, the amount of dissolved ozone is swung in the opposite direction to the case where the amount of transmitted ultraviolet light varies. (Part indicated by arrow B in FIG. 12B). Further, when ozone gas is injected, the concentration of dissolved ozone increases (decreases in the case of the amount of transmitted ultraviolet light) from the point of time when the reaction with the substance ends (as indicated by arrow C in FIG. 12B). Part shown). Without considering the influence of the substance, the amount of UV transmission of raw water before ozone gas injection was determined as the origin light amount, and when the dissolved ozone concentration of ozone water after ozone gas injection was measured, the value was lower than the original dissolved ozone concentration. Therefore, the dissolved ozone concentration of ozone water cannot be measured accurately.

  Therefore, the present invention is able to accurately measure the dissolved ozone concentration of ozone water based on the amount of transmitted ultraviolet light even when the raw water contains a substance whose amount of transmitted ultraviolet light changes due to reaction with ozone. An object is to provide a measurement method.

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

That is, in claim 1,
When ozone gas is injected into raw water to generate ozone water, a method of measuring the dissolved ozone concentration of ozone water based on the change in the amount of ultraviolet light transmitted through the ozone water,
A pre-injection permeation amount acquisition step of acquiring the ultraviolet light permeation amount of the raw water every predetermined time before injecting the ozone gas into the raw water;
An origin setting step for setting the ultraviolet light transmission amount of the raw water acquired in the transmission amount acquisition step before injection as an origin light amount,
An injection step of injecting the ozone gas into the raw water;
A post-injection transmission amount acquisition step of acquiring the ultraviolet transmission amount of the ozone water every predetermined time after the ozone gas injection start;
A determination step of determining whether or not the amount of ultraviolet light transmitted through the ozone water acquired in the transmission amount acquisition step after the start of injection is smaller than the origin light amount set in the origin setting step;
The origin for resetting the ultraviolet light transmission amount of the ozone water as the origin light amount when it is determined in the determination step that the ultraviolet light transmission amount of the ozone water is not smaller than the origin light amount set in the origin setting step. A resetting step.

In claim 2,
In the permeation amount acquisition process after the start of injection, the UV light transmission amount of the ozone water is detected every predetermined time after the ozone gas injection is started, and the average value of the UV light transmission amount detected in the past predetermined time is acquired. To do.

In claim 3,
In the pre-injection transmission amount acquisition step, the ultraviolet transmission amount of the raw water is detected every predetermined time before the ozone gas is injected into the raw water, and the ultraviolet transmission amount of the raw water detected in the past predetermined time is detected. An average value is obtained, and an average value of the ultraviolet transmission amount of the raw water and an average value of the ultraviolet transmission amount of the raw water obtained immediately before the past predetermined time obtained in the same manner as the average value of the ultraviolet transmission amount of the raw water. When the difference is within a specified value, the average value of the amount of ultraviolet light transmitted through the raw water is set as the amount of ultraviolet light transmitted through the raw water before the ozone gas is injected.

In claim 4,
Whether the dissolved ozone concentration of the ozone water has reached a predetermined target concentration when it is determined in the determination step that the ultraviolet light transmission amount of the ozone water is smaller than the light amount of origin set in the origin setting step It further has a target density determination step for determining whether or not.

  ADVANTAGE OF THE INVENTION According to this invention, even when the raw | natural water contains the substance from which ultraviolet-ray transmission amount changes by reaction with ozone, the dissolved ozone concentration of ozone water can be measured correctly.

The front view of the endoscope sterilizer by ozone water provided with the ozone water concentration meter. The top view of the endoscope sterilizer by ozone water similarly. The right view of the endoscope sterilizer by ozone water similarly. The rear view of the endoscope sterilizer by ozone water similarly. The front view which shows the structure inside the endoscope sterilizer by ozone water provided with the ozone water concentration meter. The right view which similarly shows the internal structure of the endoscope sterilizer by ozone water. The side view of the ozone water concentration meter arrange | positioned in the endoscope sterilizer by ozone water. The figure which shows the flow of the dissolved ozone concentration measuring method which concerns on one Embodiment of this invention. Similarly, it is explanatory drawing for demonstrating the dissolved ozone concentration measuring method of ozone water, (a) is a figure which shows a time-dependent change of ultraviolet-ray transmission amount, (b) is a figure which shows a time-dependent change of dissolved ozone concentration. The schematic diagram which shows the structure of the ozone sterilizer which is another example of the apparatus for implementing the dissolved ozone concentration measuring method of ozone water. It is explanatory drawing for demonstrating the conventional dissolved ozone concentration measuring method, (a) is a figure which shows a time-dependent change of ultraviolet-ray transmission amount, (b) is a figure which shows a time-dependent change of dissolved ozone concentration. It is explanatory drawing for demonstrating the problem of the conventional dissolved ozone concentration measuring method, (a) is a figure which shows a time-dependent change of ultraviolet-ray transmission amount, (b) is a figure which shows a time-dependent change of dissolved ozone concentration.

Next, embodiments of the invention will be described.
First, the configuration of an endoscope sterilizer using ozone water will be described with reference to FIGS. 1 to 5 as an example of an apparatus for carrying out the dissolved ozone concentration measuring method according to the embodiment of the present invention.

  The endoscope sterilization apparatus using ozone water immerses the endoscope (10), which is an article to be sterilized, inside the sterilization tank (2) filled with ozone water, and the endoscope (10) The inside is sterilized and disinfected. The main body has an exterior (1), and the exterior (1) is composed of a front plate (1a), side plates (1b and 1b), a back plate (1c), a lid (3), and the like. . The lid (3) is a part that opens and closes when the tray with the endoscope (10) supported is taken in and out, and the lid (3) is not opened during the sterilization process. Locked by the lock mechanism. The sterilization tank (2) is configured inside the exterior (1), and the endoscope (10) installed on the tray is immersed in the sterilization tank (2) to perform sterilization treatment.

  In addition to the lid (3), a touch panel (4) and a water flow confirmation window (5) are provided on the upper surface of the endoscope sterilization apparatus using ozone water, in a portion that cannot be opened and closed. The touch panel (4) serves as both a touch panel operation panel and a liquid crystal display panel for status display. By touching the operation content displayed on the touch panel (4), a sterilization operation is performed. In addition, the progress status of the current work is displayed. Further, the water flow confirmation window (5) is a window for confirming that water is flowing normally during the sterilization treatment, and visually confirming whether the water flow is flowing inside the arranged pipe. It has a configuration that can.

  As shown in FIG. 4, (7) is a power switch. (9) is a power inlet, which is a terminal for inputting power.

  The water supply port (6) is provided in the back surface part of the exterior (1), and it is comprised so that tap water may be supplied as raw | natural water used in order to produce | generate ozone water from water supply. A drain port (12) is further provided on the back surface of the exterior (1), and is configured to discharge water after sterilization treatment. (13) is a caster that enables the endoscope sterilizer to move with ozone water.

  Next, details of the inside of the endoscope sterilizer using ozone water will be described with reference to FIGS.

  An endoscope connection port (14) is provided inside the sterilization tank (2). The endoscope (10) is attached to the endoscope connection port (14) through the sterilizing tube (50). Ozone water is configured to be ejected from the endoscope connection port (14) into the channel of the endoscope (10) through the sterilization tube (50).

  An ozone gas generation unit that generates ozone gas for an endoscope sterilizer using ozone water is disposed in the body. The ozone gas generation unit includes an ozonizer for generating ozone gas. Oxygen gas in the oxygen cylinder is supplied to the ozone gas generation unit from the oxygen supply port (41), and ozone gas is generated from the oxygen gas by an ozonizer. The generated ozone gas is injected into the raw water in the ozone water generation unit in the main body to generate ozone water.

  The ozone water generated in the ozone water generation unit is poured into the channel of the endoscope (10) from the endoscope sterilization unit in the main body through the endoscope connection port (14). A water supply pump (37) is provided in the middle stage of the body. The water supply pump (37) supplies water to the ozone water generation unit, the ozone water concentration meter (29), and the endoscope sterilization unit.

  The ozone water concentration meter (29) is a dissolved ozone concentration meter for detecting the dissolved ozone concentration of the ozone water generated by the ozone water generation unit.

  In addition, an ozonolysis unit is provided in the lower part of the main body. The ozone decomposing unit is an apparatus for decomposing ozone gas separated from ozone water in the sterilization tank (2) into safe oxygen gas and discharging it to the outside.

  In such a configuration, as shown in FIG. 6, a portion of the ozone water sent from the ozone water generation unit via the ozone water supply path is continuously sampled by the water supply pump (37), and the ozone being processed is An ozone water concentration meter (29) for continuously detecting the dissolved ozone concentration of water is arranged at the upper stage in the main body. As shown in FIG. 7, the ozone water concentration meter (29) includes a UV light source part (57), a UV light receiving part (58), an ozone water inlet (59), an ozone water outlet (60), and an air outlet ( 67). The ozone water concentration meter (29) and the water supply pump (37) are connected to control means (not shown). The control means can execute a predetermined control program related to a measurement process program of the ozone water concentration meter (29) stored in advance and a dissolved ozone concentration measurement method of ozone water described later. The control means controls the ozone water concentration meter (29) and the water supply pump (37) to supply the sampled raw water or ozone water to the ozone water inlet (59), and from the UV light source part (57). The ozone water is irradiated with UV (ultraviolet light) and received by the UV light receiving section (58), and the dissolved ozone concentration of the ozone water is determined by the attenuation of the UV light. That is, the control means is based on the ratio between the amount of ultraviolet light transmitted when the raw water is passed and the amount of transmitted ultraviolet light of ozone water generated by injecting ozone gas into the raw water detected by the UV light receiver (58). Calculate the dissolved ozone concentration.

  However, when the raw water used for generating ozone water contains a substance whose ultraviolet ray transmission amount changes due to reaction with ozone, it is lower than the original dissolved ozone concentration when measured by the ozone water concentration meter (29). It is measured as a value, and the dissolved ozone concentration of ozone water cannot be measured accurately. Therefore, it is necessary to be able to accurately measure the dissolved ozone concentration even when the substance is contained. In the following, a method for measuring the dissolved ozone concentration of ozone water that can accurately measure the dissolved ozone concentration of ozone water by controlling the ozone water concentration meter (29) even when the substance is contained is described. To do.

Next, the dissolved ozone concentration measuring method of ozone water is demonstrated using FIG.8 and FIG.9.
The dissolved ozone concentration measuring method of ozone water is a method for measuring the dissolved ozone concentration of ozone water based on the change in the amount of ultraviolet light transmitted through the ozone water when ozone gas is generated by injecting ozone gas into raw water. 8, pre-injection permeation amount acquisition step S10, origin C ₀ setting step S20, ozone gas injection start step S30, post-injection permeation amount acquisition step S40, determination step S50, and origin C _0. It mainly includes a resetting step S60 and a target density determination step S70.

  The pre-injection transmission amount acquisition step S10 is a step of acquiring the ultraviolet transmission amount of raw water (hereinafter also referred to as raw water transmitted light amount Ca) at predetermined time intervals before injecting ozone gas into the raw water. That is, in the permeation amount acquisition step S10 before injection, before ozone gas is injected into the raw water by the ozone water generation unit, the ozone light concentration meter (29) causes the UV light source (57) to emit UV light (ultraviolet light). Is irradiated to the raw water, the UV light transmitted through the raw water is received by the UV light receiving unit (58), and the raw water transmitted light amount Ca is acquired as the transmitted light amount of the UV light.

Specifically, in the pre-injection transmission amount acquisition step S10, before the ozone gas is injected into the raw water, the ultraviolet transmission amount of the raw water is detected every predetermined time (in this embodiment, every 0.2 seconds), and The average value Cb of the ultraviolet transmission amount of the raw water detected in the past predetermined time (5.0 seconds in the present embodiment) is acquired, and the average value Cb of the ultraviolet transmission amount of the raw water and the ultraviolet transmission amount of the raw water are calculated. Average value of the amount of ultraviolet light transmitted through the raw water just before the predetermined time (5.0 seconds in this embodiment) acquired in the same manner as the average value Cb (average value Cb acquired five seconds before) When the difference is within the specified value, the average value Cb of the ultraviolet transmission amount of the raw water is set as the raw water transmission light amount Ca which is the ultraviolet transmission amount of the raw water before the ozone gas is injected. That is, in this embodiment, the average value Cb of the ultraviolet transmission amount of raw water for 5.0 seconds is acquired, and the ultraviolet transmission amount of raw water acquired 5.0 seconds before the average value Cb and the average value Cb. The average value Cb is compared, and if the difference is within the specified value, the average value Cb is set as the raw water transmitted light amount Ca.
Here, the reason why the specified value is set is that the ultraviolet ray transmission amount of the raw water measured in a state where the ultraviolet ray transmission becomes unstable due to the presence of bubbles or the like in the raw water is not adopted as the raw water transmission light amount Ca. is there. If the value does not fall within the specified value, the average value Cb is continuously acquired until the value falls within the specified value.

In the origin C ₀ setting step S20, the raw water transmitted light amount Ca, which is the ultraviolet light transmitted amount of the raw water acquired in the pre-injection transmission amount acquisition step S10, is converted into the origin light amount where the dissolved ozone concentration of ozone water becomes 0 mg / L (origin) a step of setting as C _0.

  The ozone gas injection start step S30 is a step of injecting ozone gas into the raw water. That is, in the ozone gas injection start step S30, the ozone gas generated by the ozonizer is injected into the raw water by the ozone water generation unit to generate ozone water.

  The post-injection transmission amount acquisition step S40 is a step of acquiring an ultraviolet transmission amount of ozone water after the start of the ozone gas injection (transmission light amount C after the start of injection; hereinafter also referred to as transmitted light amount C) every predetermined time. That is, in the permeation amount acquisition step S40 after the start of injection, after ozone gas is started to be injected into the raw water by the ozone water generation unit, UV light (ultraviolet light) is emitted from the UV light source unit (57) by the ozone water concentration meter (29). ) Is irradiated to the ozone water, the UV light transmitted through the ozone water is received by the UV light receiving unit (58), and the amount of transmitted UV light, which is the amount of transmitted UV light, is acquired every predetermined time.

  Specifically, in the transmission amount acquisition step S40 after the start of injection, the ultraviolet transmission amount of ozone water is detected every predetermined time (in this embodiment, every 0.2 seconds) after the start of the ozone gas injection, The average value of the amount of ultraviolet light transmitted through ozone water detected in time (1.0 seconds in the present embodiment) is obtained, and the average value is acquired as transmitted light amount C.

In the determination step S50, is the transmitted light amount C, which is the ultraviolet light transmission amount of ozone water acquired in the transmission amount acquisition step S40 after the start of injection, smaller than the origin light amount C ₀ set in the origin C ₀ setting step S20? It is a step of determining whether or not. In decision step S50, (when the determination of S50 in YES) with respect to the origin amount C ₀ set by the origin C ₀ setting step S20, if the amount of transmitted light obtained after starting ozone injection C is determined to be smaller Shifts to the target concentration determination step S70. On the other hand, the determination in step S50, with respect to the origin C ₀ setting step S20 origin amount C ₀ which is set in, a determination if the transmitted light amount C which is acquired after the start ozone gas injected are determined to be smaller (S50 NO In this case), the process proceeds to the origin C ₀ resetting step S60.

In the origin C ₀ resetting step S60, it is determined in the determination step S50 that the transmitted light amount C that is the ultraviolet light transmission amount of the ozone water is not smaller than the origin light amount C ₀ set in the origin C ₀ setting step S20. In this case, the transmitted light amount C which is the ultraviolet light transmitted amount of the ozone water is reset as the origin light amount C _{0 at which} the dissolved ozone concentration of the ozone water becomes 0 mg / L (origin). Thereafter, ozone gas is continuously injected into the ozone water (S80), and the process returns to the permeation amount acquisition step S40 after the injection is started.

In the target concentration determination step S70, when it is determined in the determination step S50 that the transmitted light amount C, which is the ultraviolet light transmission amount of the ozone water, is smaller than the origin light amount C ₀ set in the origin C ₀ setting step S20. This is a step of determining whether or not the dissolved ozone concentration of the ozone water has reached a predetermined target concentration. In the target concentration determination step S70, when it is determined that the dissolved ozone concentration of the ozone water has reached the predetermined target concentration (when the determination in S70 is YES), the injection of ozone gas is stopped (S90), and then the injection is started. The process returns to the transmission amount acquisition step S40. On the other hand, when it is determined that the dissolved ozone concentration of the ozone water does not reach the predetermined target concentration (when the determination in S70 is NO), ozone gas is continuously injected into the ozone water (S100), and after the injection starts The process returns to the transmission amount acquisition step S40.

  FIG. 9 is an explanatory diagram for explaining a method for measuring the dissolved ozone concentration of ozone water according to an embodiment of the present invention. FIG. 9A is a diagram showing a change with time in the amount of transmitted UV light, and FIG. It is a figure which shows the time-dependent change of a density | concentration.

As shown in FIG. 9, when the raw water contains a substance whose ultraviolet ray transmission amount changes due to the reaction with ozone, if ozone gas is injected into the raw water to generate ozone water, the ultraviolet ray transmission amount is affected by the substance. Fluctuates in an increasing direction. In order to cope with this, in the dissolved ozone concentration measuring method described above, the maximum value of the transmitted light amount C acquired after ozone gas injection instead of the raw water transmitted light amount Ca (the initial raw water light amount shown in FIG. 9A). (A portion indicated by an arrow A in FIG. 9A) is set as the corrected raw water quantity. 9A is converted into a dissolved ozone concentration as shown in FIG. 9B. As a result, when the raw water transmitted light amount Ca is used as the origin light amount C ₀ , the dissolved ozone concentration is When the maximum value of the transmitted light amount C is used as the corrected raw water light amount as the origin light amount C ₀ (“concentration before correction” shown in FIG. 9B), the decrease in dissolved ozone concentration due to the substance is calculated. Therefore, an accurate dissolved ozone concentration (“concentration after correction” shown in FIG. 9B) can be measured. Further, in this way, when the transmitted light amount C is smaller than the set origin light amount C ₀ due to the influence of the substance, the maximum value of the transmitted light amount C acquired after the ozone gas injection is automatically used as the origin light amount C _0. 8 is stored in the control means (including a program for calculating the maximum value of the transmitted light amount C) so that the control means can execute the control program. That's fine.

  Next, the configuration of an ozone sterilizer using ozone water will be described with reference to FIG. 10 as another example of an apparatus for carrying out the dissolved ozone concentration measuring method of ozone water according to an embodiment of the present invention.

As shown in FIG. 10, the sterilization tank (300) is a sterilization tank in which an object to be sterilized is accommodated, and the sterilization tank (300) includes an ozone water production apparatus (310) and an ozone water concentration measuring device (360). And an exhaust ozone gas decomposer (330). The ozone water production apparatus (310) can supply ozone water from the ozone water production apparatus (310) to the sterilization tank (300), and sterilizes by supplying ozone water to the sterilization tank (300). The object to be sterilized in the tank (300) can be sterilized.
In addition, the ozone water concentration measuring device (360) can measure the dissolved ozone water concentration of ozone water by the amount of transmitted ultraviolet light in the same manner as the ozone water concentration meter (29) described above.

  The ozone water supplied into the sterilization tank (300) is drained by the water pump (320), and the ozone accumulated in the sterilization tank (300) passes through the exhaust ozone gas decomposer (330) and the blower (340). Can be exhausted. In the exhaust ozone gas decomposer (330), ozone is decomposed and discharged to the blower (340).

  The sterilization tank (300) is provided with an ozone water concentration measuring device (360), and the detected value of the ozone water concentration measuring device (360) is input to the control circuit (370) as an electric signal, and the control circuit ( 370), the product of ozone water concentration and time (CT value) can be controlled to be constant. For example, the dissolved ozone concentration is measured by the ozone water concentration measuring device (360), the dissolved ozone water concentration is integrated by the arithmetic circuit (380) and the timer circuit (390) of the control circuit (370), and the integrated value (CT). The sterilization can be stopped when becomes a predetermined value.

  Specifically, the control circuit (370) includes an arithmetic circuit (380) and a timer circuit (390). The arithmetic circuit (380) outputs the dissolved ozone water concentration (360) output from the ozone water concentration measuring device (360). When the electrical value of C) is integrated by the time (T) output from the timer circuit (390) to calculate the integral value (CT), and the value becomes a value determined in advance for each sterilization target, It can be controlled to stop the sterilization process.

  At this time, the control circuit (370) controls the blower (340), the ozone water production device (310), and the water pump (320) to control the ozone water supply amount, the drainage amount, and the exhaust ozone gas amount.

  Further, instead of the ozone water concentration measuring device (360), a liquid phase ozone CT value detector detects the CT value directly, and the control circuit (370) stops sterilization when the CT value reaches a predetermined value. Also good.

  In the ozone sterilizer using ozone water configured as described above, the ozone water generated by injecting ozone gas into the raw water and the amount of transmitted ultraviolet light when the raw water is passed, as in the above-described endoscope sterilizer using ozone water. The dissolved ozone concentration is calculated on the basis of the ratio to the amount of UV transmitted.

  However, when the raw water used for generating ozone water contains a substance whose ultraviolet transmission amount changes due to the reaction with ozone, it is more than the original dissolved ozone concentration when measured by the ozone water concentration meter (360). It is measured as a low value, and the dissolved ozone concentration of ozone water cannot be measured accurately. Therefore, it is necessary to be able to accurately measure the dissolved ozone concentration even when the substance is contained. Therefore, even in this ozone sterilization apparatus, the ozone water concentration measuring device (360) is controlled by using the method for measuring the dissolved ozone concentration of the ozone water, so that the ozone water concentration measuring device (360) is dissolved. The ozone concentration can be measured accurately.

  As described above, according to the method for measuring the dissolved ozone concentration of ozone water according to the present embodiment, even when the raw water contains a substance that changes the amount of transmitted ultraviolet light by reaction with ozone, it is affected by the substance. The dissolved ozone concentration of ozone water can be accurately measured. As described in the present specification, when the substance is included, if the origin light amount is not corrected, the dissolved ozone concentration is measured as a value lower than the original dissolved ozone concentration. When maintaining the target concentration, excess ozone gas is injected. However, when the substance is contained as in the present embodiment, it is possible to prevent such excessive ozone gas from being injected by appropriately correcting the light amount at the origin. If injection of excessive ozone gas can be prevented, excessive consumption of energy due to generation of ozone gas, deterioration of members due to dissolved ozone concentration higher than the setting, early deterioration of ozone decomposition function such as a catalyst of the ozone decomposition unit can be suppressed. .

DESCRIPTION OF SYMBOLS 1 Exterior 2 Sterilization tank 3 Lid 4 Touch panel 5 Water flow confirmation window 6 Water supply port 10 Endoscope 14 Endoscope connection port 29 Ozone water concentration meter 37 Water supply pump 50 Sterilization tube 57 UV light source unit 58 UV light receiving unit 59 Ozone Water inlet 67 Air outlet

Claims (4)

When ozone gas is injected into raw water to generate ozone water, a method of measuring the dissolved ozone concentration of ozone water based on the change in the amount of ultraviolet light transmitted through the ozone water,
A pre-injection permeation amount acquisition step of acquiring the ultraviolet light permeation amount of the raw water every predetermined time before injecting the ozone gas into the raw water;
An origin setting step for setting the ultraviolet light transmission amount of the raw water acquired in the transmission amount acquisition step before injection as an origin light amount,
An injection step of injecting the ozone gas into the raw water;
A post-injection transmission amount acquisition step of acquiring the ultraviolet transmission amount of the ozone water every predetermined time after the ozone gas injection start;
A determination step of determining whether or not the amount of ultraviolet light transmitted through the ozone water acquired in the transmission amount acquisition step after the start of injection is smaller than the origin light amount set in the origin setting step;
The origin for resetting the ultraviolet light transmission amount of the ozone water as the origin light amount when it is determined in the determination step that the ultraviolet light transmission amount of the ozone water is not smaller than the origin light amount set in the origin setting step. A method for measuring the dissolved ozone concentration of ozone water, comprising: a resetting step.   In the permeation amount acquisition process after the start of injection, the UV light transmission amount of the ozone water is detected every predetermined time after the ozone gas injection is started, and the average value of the UV light transmission amount detected in the past predetermined time is acquired. The method for measuring a dissolved ozone concentration of ozone water according to claim 1.   In the pre-injection transmission amount acquisition step, the ultraviolet transmission amount of the raw water is detected every predetermined time before the ozone gas is injected into the raw water, and the ultraviolet transmission amount of the raw water detected in the past predetermined time is detected. An average value is obtained, and an average value of the ultraviolet transmission amount of the raw water and an average value of the ultraviolet transmission amount of the raw water obtained immediately before the past predetermined time obtained in the same manner as the average value of the ultraviolet transmission amount of the raw water. When the difference is within a prescribed value, the average value of the amount of ultraviolet light transmitted through the raw water is set as the amount of ultraviolet light transmitted through the raw water before the ozone gas is injected. The dissolved ozone concentration measuring method of the ozone water according to claim 2.   Whether the dissolved ozone concentration of the ozone water has reached a predetermined target concentration when it is determined in the determination step that the ultraviolet light transmission amount of the ozone water is smaller than the light amount of origin set in the origin setting step The method for measuring a dissolved ozone concentration of ozone water according to any one of claims 1 to 3, further comprising a target concentration determination step of determining whether or not.

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