JP2002286709A - Half-value period measuring device for ozone concentration - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a measuring device capable of measuring simply the half- value period of the ozone concentration. SOLUTION: The half-value period measuring device 100 determines the half-value period of the ozone concentration at the initial stage by sensing the ozone concentration supplied into the specified sampling space 53, wherein the fundamental constitution comprises an ozone generator 20 to supply ozone into the sampling space 53, an ozone concentration sensing meter 30 to sense the ozone concentration in the sampling space 53, and a control device 40 to calculate the half-value period of the ozone concentration, and further the control device 40 has a half-value period computing part 44, which computes the half-value period on the basis of the initial ozone concentration in the space 53 sensed by the concentration sensing meter 40 and the ozone concentration after elapse of a certain time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for supplying ozone to a container contaminated with contaminants such as various odor components and bacteria, and the ozone is attenuated by reacting with the contaminants and being consumed. The present invention relates to an apparatus for measuring a half-life of an ozone concentration for measuring a half-life in a case.

[0002]

2. Description of the Related Art Conventionally, when the interior of a room is contaminated by odorous components or bacteria volatilized from tobacco, spoiled food, various organic solvents, etc., ozone from an ozone generator is introduced into the contaminated space, It is known that odor components and bacteria can be decomposed with the excellent oxidizing power of the above to clean the contaminated space.

[0003]

In order to purify a contaminated space by introducing ozone, it is necessary to know the degree of contamination of the contaminated space, and therefore, the concentration of the contaminants in the contaminated space must be detected. However, there are many types of contaminants, and it is very difficult to detect the concentration of all contaminants.

[0004] Even if the concentration of all the contaminants is detected with much time and effort, the overall degree of contamination cannot be practically properly evaluated. While there is a problem, ozone reacts with various pollutants by virtue of its strong oxidizing action, and it is conceivable to use the properties of ozone for comprehensive evaluation of pollution.

Therefore, it is conceivable to fill the polluted space with a predetermined concentration of ozone and measure the time until the ozone concentration becomes 1/2 of the initial concentration, that is, the half-life of the ozone concentration. That is, since this half-life comprehensively covers all the pollution conditions in the polluted space, COD (chemical oxygen demand) or B
It is thought that the same concept as OD (biological oxygen demand) becomes the best index for the degree of contamination of the contaminated space.

However, in order to measure the half-life of the ozone concentration, once the inside of the contaminated space is set to a predetermined ozone concentration, the ozone concentration decay is reduced to half the initial value over time. Must be continuously measured until
There is a problem that it is very troublesome.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to provide an ozone concentration half-life measuring apparatus capable of easily measuring the ozone concentration half-life. And

[0008]

According to the first aspect of the present invention,
An ozone concentration half-life measuring device for measuring a half-life which is a half decay time of ozone by detecting a change in the supplied ozone concentration, wherein the half-life measuring device is provided in a container containing a gas or liquid to be measured. An ozone generator for supplying ozone, an ozone concentration detector for detecting the ozone concentration in the container, and a control device for calculating a half-life of the ozone concentration are provided. It has a half-life calculator for calculating a half-life based on the detected initial ozone concentration in the container and the ozone concentration after a given time has elapsed.

According to the present invention, when measuring the ozone concentration half-life, it is possible to obtain the ozone concentration half-life in the container simply by measuring the initial ozone concentration in the container and the ozone concentration at an arbitrary time. The measurement time is significantly shortened compared to the half-life measurement method, in which the ozone concentration is measured continuously and continuously with an ozone concentration detector until the ozone reaches a saturated concentration. Measurement efficiency is greatly improved.

[0010] In the first aspect of the present invention, the half-life calculating unit is defined as: x = x ₀ × exp (−0.693 t / τ) (where t:
Elapsed time (hr), x: ozone concentration after elapse of t time (g
/ M ³ ), x ₀ : initial concentration of ozone (g / m ³ ), τ: half-life of ozone concentration (hr)), and the half-life of ozone concentration is calculated. Alternatively, the half-life calculation unit may be defined as: x = (Z / V) × (τ / −0.693) × (1-exp
(-0.693 t / τ)) (where, Z: injection amount of ozone per unit time (g / hr), V: capacity of container (m ³ ), t: elapsed time (hr), x: t time Ozone concentration (g / m ³ ) after elapse, τ: half-life of the ozone concentration (h
r)), the half-life of the ozone concentration may be calculated based on the ozone concentration increasing formula (claim 3).

[0011]

FIG. 1 is an explanatory view showing an embodiment of a half-life measuring apparatus 100 for ozone concentration according to the present invention, and FIG. 2 is a diagram showing the appearance of the half-life measuring apparatus shown in FIG. It is a perspective view showing one embodiment. Half-life measuring device 100
Supplies a predetermined concentration of ozone to the sample air collected from the contaminated space for which the half-life of the ozone concentration is to be measured, appropriately detects the ozone concentration of the sample air, and reduces the ozone concentration by half based on the detection result. The period is calculated.

As shown in FIG. 1, the half-life measuring device 100 includes a measuring device main body 10 and the measuring device main body 10.
And a sampling box (container) 50 adjacent to the sampling box. The measurement device body 10 and the sampling box 50 are housed in a box-shaped casing 101 as shown in FIG.

Then, such a half-life measuring device 100
Is taken into the contaminated space to be measured, and in this contaminated space, the contaminated air is taken into the sampling box 50 to be used as sample air.
After the is closed, ozone is supplied to the sample air to calculate the half-life of the ozone concentration, and the calculation result is output.

Thus, the sampling box 50
The wall 51 surrounding all sides and the casing 1 as the other one
1 and 2 is provided with an openable and closable door 52 provided on the right side in FIGS. 1 and 2. A sampling space 53 for taking in contaminated air is formed by a space surrounded by the wall 51 and the door 52.

Further, a rectangular contaminated air intake 102 is opened at the right side of the casing 101,
Is rotatably supported around a horizontal shaft 103 erected so as to cross the upper part of the contaminated air intake 102. Therefore, after bringing the half-life measuring device 100 into the measurement target space, the contaminated air in the measurement target space is taken into the sampling space 53 by reciprocating the opening and closing door 52 around the horizontal axis 103 a plurality of times. Will be.

The wall 51 of the partition member support structure 50
A stirring fan 54 is provided at an appropriate position (the bottom of the sampling space 53 in the example shown in FIG. 2).
By stirring the air in the sampling space 53 by the drive of 4, the odor component from the polluted space to be measured is uniformly diffused, and the ozone introduced from the measuring device main body 10 is also uniformly diffused.

As shown in FIG. 1, the measuring apparatus main body 10 for measuring the half-life of the ozone concentration in the sampling space 53 includes an ozone generator 20 for generating and supplying ozone to the sampling space 53, Sampling space 53
An ozone concentration detector 30 for detecting the ozone concentration in the inside, and a half-life of the ozone concentration in the sampling space 53 is calculated based on a detection signal from the ozone concentration detector 30, and various controls are performed in the measurement. Control device 40 that performs
And a basic configuration including:

The ozone generator 20 includes an AC high voltage generating circuit 21 for generating AC high frequency high voltage by obtaining commercial power.
And the counter electrode 2 that generates a discharge when an AC high frequency high voltage is applied from the AC high voltage generation circuit 21.
2 and a fan 23 for sending air between the opposed electrodes 22
It is comprised including. Oxygen in the air supplied between the counter electrodes 22 by driving the fan 23 is partially converted into ozone by the action of electric discharge, and the ozone is supplied to an ozone supply line 24 provided at the downstream end of the ozone generator 20. Through the sampling space 53.

The ozone concentration detector 30 is configured to supply the sample air in the sampling space 53 sucked through the sample pipe 31 to a predetermined ozone sensor of an ultraviolet absorption type or a semiconductor sensing type. Commercially available products have been adopted. The detection signal of the ozone concentration detected by the ozone sensor is inputted to the control device 40 one by one.

In the present embodiment, an ozone generator 20 utilizing discharge by applying an AC high-frequency high voltage to a counter electrode 22 is used as an apparatus for generating ozone. The device for generating the above is not limited to the ozone generator 20 as described above, and an ultraviolet lamp capable of irradiating ultraviolet light having a wavelength of around 170 nm may be employed.

The control device 40 is a small computer called a microcomputer, and has a CPU
(Central processing unit) and a storage device, an input / output device 41 having a keyboard for input and a display and printer for output, a RAM 42 as a readable and writable external storage device, and a read-only A ROM 43 as an external storage device is provided.

From the input / output device 41, various measurement conditions, the operating conditions of the ozone generator 20, and the like are input, and the detection results of the ozone concentration detector 30 and the control device 4
The half life of the ozone concentration in the sampling space 53 calculated by 0 is output.

The RAM 42 temporarily stores updatable data such as input data from the input / output device 41, intermediate data in the middle of calculation in the control device 40, and the like.

The ROM 43 stores a program for calculating the half-life of the ozone concentration and a program for controlling the operation of the ozone generator 20 and the ozone concentration detector 30. Therefore, by turning on a start switch (not shown) provided in the input / output device 41, the programs are read into the control device 40,
As a result, the control device 40 is in a state where it can perform control based on each of the programs.

The control device 40 has an internal CPU.
And a half-life calculation unit 44 configured by combining the storage device and the storage device. The half-life calculation unit 44 calculates the half-life of the ozone concentration based on the detection signal from the ozone concentration detector 30. Has become. This calculation result is output via the input / output device 41.

The input / output device 41 includes a casing 101
2 has an interface portion for exchanging with an operator provided in the input / output space 104 on the left side in FIG. The input / output space 104
The outer plate and the top plate of the casing 101 are formed by recessing part of the top plate, and include a panel plate 105 on the side plate side and a display plate 106 on the top plate 107 side.

The panel plate 105 is provided with numeric keys and other operation keys, a power switch, and the like. The display plate 106 is provided with a display screen 46 having, for example, a liquid crystal. The result of input through the numeric keypad or operation keys, the result of calculation by the controller 40, and the like are displayed on the display.

An output port 108, which is an elongated opening for feeding out the output paper 47 of the printer (not shown), is provided at an appropriate position on the top plate 107. The calculation result of the control device 40 is discharged from the output port 108. It is printed out on output paper 47 to be printed.

Hereinafter, a description will be given of a method of calculating a program which is stored in the ROM 43 and is called each time it is necessary to calculate the half-life of the ozone concentration in the half-life calculator 44. The capacity of the sampling space 53 is set to V (m ³ ), and the injection amount is Z (g / g) through the ozone supply pipe 24.
Suppose that the ozone of h) is injected. And x: ozone concentration in sampling space 53 (g / m ³ ) t: elapsed time (h) from start of ozone injection γ: ozone concentration decay rate, where ozone concentration due to elapse of minute time (dt) Is a change amount (dx) of dx = (Z / V) · dt−γx · dt.

By solving this equation, x = ∫ ((Z / V) −γx) dt = (Z / V) · (1 / γ) · (1-e− ^γt ).

Since there is a relationship of “γ = −0.693 / τ” between the decay rate (γ) and the half-life (τ), by substituting this relationship into the equation, x = (Z / V) · (τ / −0.693) · (1-e ^{− (− 0.693 / τ) · t} )

The equation derived in this manner is represented by (Z)
Since the values of (V) and (V) are preset constants, the ozone concentration (x) in the sampling space 53 is a function of the half-life (τ) of the ozone concentration and the elapsed time (t). Then, if “t → ∞” is set, “(1-e
^{- (- 0.693 / τ) ·} t) → 1 ". _{Therefore, x ∞ = (Z / V} ) · (τ / -0.693) ... it becomes, in the sampling space 53, supplied from the ozone supply line 24 ozone and ozone to be the relationship of the saturation concentration of ozone in the state where consumption and are balanced consumed by contaminants in the sample air (x _∞) and half-life (tau) is obtained.

Therefore, the equation is stored in the ROM 43 of the measuring apparatus body 10 in advance, and when the ozone concentration in the sampling space 53 reaches the saturation concentration, the detection signal of the ozone concentration detector 30 is transmitted to the controller 40. May be input to the half-life calculation unit 44 to cause the half-life calculation unit 44 to calculate the value of the half-life (τ) by an equation. In this case, however, the ozone concentration in the sampling space 53 becomes the saturated concentration. (x _∞) long time to reach the required (usually 3 to 5 hours).

Therefore, in the present embodiment, the half-life of the ozone concentration is calculated based on the ozone concentration in the sampling space 53 at the time when an arbitrary time has elapsed since the start of the injection of ozone into the sampling space 53. ing. For this purpose, an arithmetic expression obtained by modifying the above expression is adopted. That is, in the equation, “(Z / V) · (1
/−0.693) ”is a constant and is therefore referred to as“ c ”. Then, the above equation becomes “x = cτ · (1-e)
^{-0.693t / τ} ) ”. Then, in this equation, if the ozone concentration at the time point of the elapsed time t ₀ is x ₀ , “x ₀ = cτ · (1−e− ^{0.693t0 / τ} )” is obtained. 1− (x ₀ / cτ) = e
^{-0.693t0 / τ} "is obtained.

In this equation, for convenience of calculation, “C = x ₀
/C',`T=-0.693T ₀ "and" τ _x = 1 /
When transforming the equation with “τ”, “ln (1−C · τ)
= −T · τ _x ”. Expanding the left side of the equation according to a conventional method, ln (1-C · τ x) = - deployable ^{_{C · τ x + C 2 ·}} τ x 2/2-C 3 · τ x 3/3 ... that is obtained. By ignoring the third and subsequent terms on the right-hand side of this equation and adopting the second term, “−T ·
_{τ x = -C · τ x +} C 2 · τ x 2/2 "is obtained. By calculating τ _x based on this expression, and by rearranging and replacing each replacement of the above-mentioned expression for convenience, τ = ｛x ₀ /[(Z/V)·(1/−0.693) ] ² ｝ / 2 ｛x ₀ /[(Z/V)·(1/−0.693)]−0.693 t ₀ ｝. In this equation, x ₀ , Z, V
Since t and t ₀ are all known values, the values of the half-life (τ) of the ozone concentration can be obtained by substituting these values into the equation and calculating.

In the present invention, the above equation is stored in the ROM 43 in advance, and the equation is set as RO when necessary.
The half life calculation unit 44 calls the half life calculation unit 44 from M43, and the half life calculation based on the expression is executed here.

More specifically, after an arbitrary time has elapsed after ozone was injected from the ozone generator 20 into the sampling space 53, a command signal for sampling was sent via the input / output device 41 to the control device. When input to 40, the control device 40 outputs a control signal to the ozone concentration detector 30, whereby the ozone concentration detector 30 aspirates the sample gas from inside the sampling space 53 via the sample line 31, A predetermined ozone sensor detects the concentration of ozone and outputs this detection signal to the half-life calculator 44.

The half-life calculator 44 receiving this detection signal
Calculates the half-life of the ozone concentration based on the above equation.
Incidentally, a timer 45 is built in the half-life calculation unit 44, and when the driving of the ozone generator 20 is started, this timer is turned on, and the command signal from the input / output device 41 is input to the control device 40. At this point, the timer is turned off, whereby the elapsed time (t ₀ in the equation) from the start of driving the ozone generator 20 to the sampling by the ozone concentration detector 30 is measured. The calculation result of the half life (τ) by the half life calculation unit 44 is output to the input / output device 41. I / O device 41
Displays the calculation result on the screen and prints out from the printer as necessary. From this output value, the half-life (τ) of the ozone concentration in the sampling space 53 to be measured can be known.

According to the method for determining the half-life of the ozone concentration by using the above equation, after the ozone from the ozone generator 20 starts to be injected into the sampling space 53, the ozone is discharged after an arbitrary time has elapsed. Since the concentration detector 30 detects the ozone concentration in the sampling space 53 at only one point, the half-life (τ) of the ozone concentration can be immediately obtained. It is possible to greatly reduce the measurement time as compared with a half-life measurement method in which the measurement is performed continuously and the half-life is determined after graphing the measurement results.

Next, a method of calculating the half-life based on an arithmetic expression different from the expression will be described. This method is applied when the ozone concentration in the sampling space 53 is set as an initial value (x ₀ ), contrary to the previous embodiment.

In this case, the sun is already set at the start of the measurement.
When a predetermined concentration of ozone exists in the
Ozone by contaminants in the sample air
A differential equation is created assuming that
By solving the equation, x = x₀・ E^{-0.693t / τ}The following equation can be obtained: In addition,
In the equation, τ is the half-life (h) of the ozone concentration, and t is
Elapsed time (h) from the start of fixed, x₀Is the sampling space
The initial ozone concentration in 53, x is the ozone concentration at the elapsed time t.
Zon concentration (g / m ^Three).

By transforming the above equation, it is possible to obtain τ = (− 0.693t) / ln (x / x ₀ ) for obtaining the half life (τ). This equation gives the sampling space 5
After the ozone concentration x ₀ in the sample 3 is known by measuring it with the ozone concentration detector 30, the ozone concentration detector 30 is re-entered at time t after the measurement of the initial concentration.
Indicates that the half-life of the ozone concentration is immediately calculated by measuring the ozone concentration in the sampling space 53.

In this embodiment, the ROM
An equation is stored in the equation 43 in place of the above equation, and this equation is read into the half-life calculator 44 every time measurement is performed, and the half-life calculation is executed.

As described above in detail, the measuring apparatus main body 10 of the present invention measures the half-life (τ) of the initial concentration of ozone by detecting a change in the concentration of ozone supplied into the predetermined sampling space 53. The ozone generator 20 supplies the ozone into the sampling space 53, the ozone concentration detector 30 detects the ozone concentration in the sampling space 53, and the half-life of the ozone concentration. And a control device 40 for calculating (τ). Further, the control device 40 has a half-life calculation unit 44, and the half-life calculation unit 44 detects the ozone concentration detector 40. Since the configuration is such that the ozone concentration half-life (τ) is calculated based on the initial ozone concentration in the sampling space 53 and the ozone concentration after an arbitrary time has elapsed, the ozone concentration half-life is calculated. When measuring the period (τ), it is possible to obtain the ozone concentration half-life (τ) of the sampling space 53 simply by measuring the initial ozone concentration in the sampling space 53 and the ozone concentration at an arbitrary time. Until the ozone reaches the saturation concentration.
The measurement time is significantly reduced as compared with the half-life measurement method in which the inside of the sampling space 53 must be measured with time and continuously, thereby greatly improving the measurement efficiency of the ozone concentration half-life (τ). Can be.

As a calculation formula for calculating the ozone concentration half-life (τ), x = x ₀ × exp (−0.693 t /
τ) (the above formula), and this calculation formula is
And the half-life calculating unit 44 can calculate the ozone concentration half-life (τ) based on this formula. When this formula is used, the initial ozone concentration (x ₀ ) in the sampling space 53 and the elapsed time (t)
Ozone concentration in sampling space 53 at time (x)
The ozone concentration half-life (τ) can be obtained by measuring only these two points with the ozone concentration detector 30.

Also, instead of the above equation, x = (Z / V)
× (τ / −0.693) × (1-exp (−0.693)
t / τ)) (above equation). When this equation is adopted, the initial ozone concentration in the sampling space 53 is “0 g / m ³ ” and is known in advance.
The ozone concentration half-life (τ) can be obtained by measuring only one point of the ozone concentration in the sampling space 53 at an arbitrary elapsed time (t) after the supply of ozone to the sampling space 53 is started.

In the above embodiment, the gaseous air has been described as an example of the contaminated object. However, the present invention is not limited to the contaminated object being a gas.
The contaminated object may be a liquid such as water.

[0048]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS When the ozone concentration half-life (.tau.) In a sampling space 53 where a predetermined contaminant exists is measured by the measuring apparatus body 10 according to the present invention, sampling based on the half-life (.tau.) Of the measurement result is performed. The following test was performed to verify whether or not the temporal change of the ozone concentration in the space 53 coincides with the actual half-life.

Firstly, rectangular sealed sampling space as shown in FIG. 2 capacitively set to 1 m ³ (wall 5
1 is covered with vinyl chloride), a predetermined amount of a banana as a pollution source is charged, and then an ozone generator 2 is charged.
Ozone from 0 was injected into the sampling space 53 via the ozone supply line 24. The injection amount of ozone is 0.7
mg / h.

Then, while measuring the ozone concentration in the sampling space 53 at a predetermined measurement span by the ozone concentration detector 30, the injection of ozone is continued until the ozone reaches the saturation concentration ( _x∞ ), and the saturation concentration ( The injection of ozone was stopped when it was considered that _x∞ ) had been reached.
Even after the ozone injection was stopped, the measurement of the ozone concentration by the ozone concentration detector 30 was continued, and the measurement by the ozone concentration detector 30 was stopped when the ozone concentration became substantially “0”. These measured values were printed out by the input / output device 41.

On the other hand, after starting the measurement of the ozone concentration, 1
Based on the ozone concentration (x) measured by the ozone concentration detector 30 at the time point (t = 1) at which time has elapsed, the ozone concentration half-life (τ) is obtained by the above equation, and the value of τ is calculated by the above equation and The calculated value of the ozone concentration over time was printed out from the input / output device 41 by substituting into the equation.

FIG. 3 is a graph showing the change over time of the ozone concentration in the sampling space 53 obtained by these printouts. The broken line shows the actually measured value and the black circle shows the calculated value.

As is clear from the graph of FIG. 3, the calculated value of the ozone concentration corresponds well with the actually measured value with an extremely high correlation. From this, the half-life measuring apparatus 1 of the present invention is obtained.
It was possible to demonstrate that the measurement result of the half-life using 00 was extremely accurate.

[0054]

According to the present invention, an ozone generator for supplying ozone into a container containing a gas or liquid to be measured, an ozone concentration detector for detecting the ozone concentration in the container, A half-life measuring device is constituted by a control device for calculating the half-life, and the control device has a half-life based on the initial ozone concentration in the container detected by the ozone concentration detector and the ozone concentration after an arbitrary time has elapsed. Since the half-life calculation unit for calculating the period is provided, the ozone concentration half-life in the container can be obtained only by measuring the initial ozone concentration in the container and the ozone concentration at any time. The measurement time is significantly reduced compared to the half-life measurement method in which the ozone concentration in the container must be measured over time and continuously with an ozone concentration detector until the ozone reaches a saturated concentration. It can greatly improve the measurement efficiency of the half-life.

Therefore, if the half-life of the ozone concentration measured by the half-life measuring device is adopted as an evaluation index of the degree of contamination of the contaminated space, the concentration of the contaminant itself is measured, and the measured value of the contaminated space is used. Compared with the conventional evaluation method that evaluates the degree of contamination, it is possible to more quickly and properly evaluate the overall degree of contamination,
An ozone injection plan that determines the amount of ozone to be injected, the ozone concentration, and the like can be made more effective.

[Brief description of the drawings]

FIG. 1 is a block diagram showing one embodiment of an apparatus for measuring a half-life of ozone concentration according to the present invention.

FIG. 2 is a perspective view showing an embodiment of the external shape of the half-life measuring device of FIG.

FIG. 3 is a graph showing a change over time in ozone concentration, in which a broken line indicates an actually measured value and a black circle indicates a calculated value.

[Explanation of symbols]

 REFERENCE SIGNS LIST 100 Half-life measuring device 101 Casing 102 Contaminated air intake 103 Horizontal axis 104 Input / output space 105 Panel plate 106 Display plate 107 Top plate 108 Output port 10 Measurement device main body 20 Ozone generator 21 AC high-voltage generating circuit 22 Counter electrode 23 Fan 24 Ozone supply line 30 Ozone concentration detector 31 Sample line 40 Control unit 41 Input / output unit 42 RAM 43 ROM 44 Half-life calculation unit 45 Timer 46 Display screen 47 Output paper 50 Sampling box (container) 51 Wall 52 Opening / closing door 53 Sampling space 54 Stirring fan

Claims (3)

[Claims] An ozone concentration half-life measuring device for measuring a half-life which is a half decay time of ozone by detecting a change in supplied ozone concentration, wherein a gas or liquid to be measured is stored. An ozone generator for supplying ozone into the container, an ozone concentration detector for detecting the ozone concentration in the container, and a control device for calculating a half-life of the ozone concentration. A half-life calculation unit for calculating a half-life based on the initial ozone concentration in the container detected by the ozone concentration detector and the ozone concentration after an arbitrary time has elapsed. Period measuring device. 2. The half-life of the ozone concentration according to claim 1, wherein the half-life calculation unit is configured to calculate the half-life of the ozone concentration based on the following ozone concentration decay equation. measuring device. x = x ₀ × exp (−0.693 t / τ) where t: elapsed time (hr), x: ozone concentration (g / m ³ ) after elapse of t time, x ₀ : initial ozone concentration (g / m ³ )
m ³ ), τ: half-life (hr) of ozone concentration. 3. The half-life calculation unit according to claim 1, wherein
It is configured to calculate the half-life of ozone concentration based on the increasing equation.
The ozone concentration according to claim 1, wherein
Degree half-life measuring device. x = (Z / V) × (τ / −0.693) × (1-exp
(−0.693 t / τ)) where Z is the amount of ozone injected per unit time (g / h)
r), V: capacity of container (m ^Three), T: elapsed time (h
r), x: ozone concentration after elapse of t time (g / m^Three),
τ: half-life (hr) of the ozone concentration.