JP7077583B2 - Sterilization method and sterilization equipment - Google Patents

Description

Application of Article 30, Paragraph 2 of the Patent Act September 25, 2017 Published in the abstracts of the 44th Annual Meeting of the Japanese Society for Antibacterial and Moldproofing

Application of Article 30, Paragraph 2 of the Patent Law Announced at the 44th Annual Meeting of the Japanese Society for Antibacterial and Antifungal Conditions held at Senri Life Science Center on September 27, 2017.

The present invention relates to a sterilization method and a sterilization apparatus for humidifying and sterilizing.

It has been studied to eradicate bacteria in food manufacturing facilities such as food factories and medical / welfare facilities by spraying chemicals such as hypochlorous acid aqueous solution having a bactericidal effect (for example, Patent Document 1). reference). This Patent Document 1 describes that bacteria can be eradicated by spraying a chemical solution from a two-fluid nozzle into an indoor space so that the relative humidity after spraying becomes 70% or more. Further, it is described that when the relative humidity of the indoor space before spraying is low, the chemical solution is sprayed after humidifying with a humidifier.

Japanese Unexamined Patent Publication No. 2016-27849

However, in the technique described in Patent Document 1, when spraying a chemical solution from low humidity, it is necessary to spray a large amount of the chemical solution, and as a result, there is a concern about the influence of corrosion of building materials. Therefore, it is necessary to install a humidifier separately from the sterilization equipment, which is costly and troublesome to install.

The sterilization method for solving the above problems is to sterilize the space by using a two-fluid nozzle that is connected to a liquid supply pipe to which the chemical solution used for eradication is supplied and sprays the chemical solution with a gas. In the method, a humidifying liquid is supplied to the two-fluid nozzle from a humidifying liquid supply pipe connected to the liquid supply pipe via a switching valve, and the humidifying liquid is sprayed to humidify the inside of the space. The humidification step and the sterilization step of supplying the chemical solution to the two-fluid nozzle from the chemical solution supply pipe connected to the liquid supply pipe via the switching valve to sterilize the space are executed. ..

According to the present invention, the space can be set to an appropriate humidity and sterilization can be performed efficiently.

The piping diagram explaining the structure of the sterilization apparatus in this embodiment. Explanatory drawing explaining the structure in the space of the sterilization target in this embodiment. The block diagram explaining the structure of the control unit in this embodiment. The graph explaining the relationship between the relative humidity, the time from the start of spraying, and the relative humidity in the sterilizing apparatus of this embodiment. Explanatory drawing explaining the sterilization condition in this embodiment. The flow chart of the processing procedure explaining the sterilization method in this embodiment. It is explanatory drawing explaining the flow of gas and liquid in the sterilization apparatus of this embodiment, (a) shows a humidification control process, (b) shows a chemical solution spray process, (c) shows a purge process.

Hereinafter, an embodiment in which the sterilization apparatus and the sterilization method are embodied will be described with reference to FIGS. 1 to 7.
First, the configuration of the sterilizer 30 provided with the two-fluid nozzles N1 to N5 will be described with reference to FIG.

The sterilizer 30 includes a plurality of two-fluid nozzles N1 to N5, a compressor C1, an air tank Ta1, and a chemical liquid tank Tc1. The chemical solution tank Tc1 stores the chemical solution used for sterilizing the room. As this chemical solution, a chemical solution having a pH of 6.5 and a hypochlorous acid concentration of 120 mg / L is used. This chemical solution is produced by diluting 6% sodium hypochlorite with tap water and then adding 3% hydrochloric acid as a food additive to adjust the pH. In addition, Purax (registered trademark) S was used as 6% of sodium hypochlorite. Further, tap water: Purax S: salt additive 3% hydrochloric acid was mixed at a ratio of 650: 1: 1.

The sterilization device 30 includes a gas supply pipe 31, 35, a gas supply valve 36, a fluid supply pipe 41 as a liquid supply pipe, a gas / liquid switching valve 43, a connection pipe 44, a water supply pipe 45, a chemical liquid supply pipe 46, and a valve 47. , 48, Equipped with a drain valve 49 for draining the chemical liquid into a bucket or the like. Two fluid nozzles N1 to N5 are connected to the downstream side of the gas supply pipe 31 and the fluid supply pipe 41, respectively.

The two fluid nozzles N1 to N5 use compressed air to atomize the liquid and eject it. The two-fluid nozzles N1 to N5 have an intake portion for compressed air and an intake portion for liquid, and mix air and liquid to spray a mist-like liquid from a spray port. In this embodiment, a two-fluid siphon type spray nozzle is used as the two-fluid nozzle. Specifically, a quick fogger (trade name) manufactured by Spraying Systems Japan Co., Ltd. is used. Further, the amount of the spray liquid per hour of the two fluid nozzles N1 to N5 can be controlled by the air pressure of the supplied compressed air. In this embodiment, a spray port having a mist particle diameter of 9 μm is used. A gas supply pipe 31 for supplying compressed air and a fluid supply pipe 41 for supplying the sprayed liquid are connected to the intake portions of the two fluid nozzles N1 to N5.

On the downstream side of the gas supply pipe 31, air supply valves V1 to V5 and a ball valve are provided corresponding to the two fluid nozzles N1 to N5, respectively. Each air supply valve V1 to V5 is a three-way solenoid valve, and has an external opening on the two-fluid nozzle N1 to N5 side when not energized, and a gas supply pipe 31 and each two-fluid nozzle N1 to N5 when energized. Switch between connections.

The upstream side of the gas supply pipe 31 is connected to the air tank Ta1 via a pressure reducing valve, a mist separator, and a ball valve. The air tank Ta1 is connected to the compressor C1 via a ball valve, and the compressed air is supplied to the gas supply pipe 31 by the pressure from the compressor C1.

The gas supply pipe 31 is connected to the gas supply pipe 35 via a pressure reducing valve. The gas supply pipe 35 is supplied to the chemical liquid tank Tc1 via the gas supply valve 36. The gas supply pipe 35 is connected to the fluid supply pipe 41 via the gas / liquid switching valve 43.

On the other hand, the fluid supply pipe 41 is connected to the connecting pipe 44 via the gas-liquid switching valve 43.
The gas-liquid switching valve 43 is a three-way solenoid valve that switches the connection between the fluid supply pipe 41 and the gas supply pipe 35 when the power is off, and the connection between the fluid supply pipe 41 and the connection pipe 44 when the power is on.

The connection pipe 44 is connected to a water supply pipe 45 as a humidifying liquid supply pipe and a chemical liquid supply pipe 46, respectively. The water supply pipe 45 is connected to the water pipe W1 via a valve 47, a check valve and a pressure reducing valve. In this embodiment, tap water from the water pipe W1 is used as a humidifying liquid.

The chemical liquid supply pipe 46 is connected to the chemical liquid tank Tc1 via the valve 48 and the ball valve. By opening one and closing the other, the valves 47 and 48 function as a switching valve for supplying water from the water pipe or the chemical liquid from the chemical liquid tank Tc1 to the connecting pipe 44.

<Arrangement of two fluid nozzles N1 to N5>
Next, the arrangement of the two fluid nozzles N1 to N5 will be described with reference to FIG. In this embodiment, it is assumed that the spaces of the rooms R1, R2, and R3 are sterilized. The chemical solution tank Tc1 storing the chemical solution used for sterilizing the space of the rooms R1 to R3 is installed in a place other than the rooms R1 to R3.

The rooms R1 and R2 communicate with each other through the doors D1 and D2. The room R3 communicates with the rooms R1 and R2 through the doors D3 and D4, respectively.
Humidity sensors M1 and M2 are attached to the side surfaces of the pillars of the rooms R1 and R2, respectively. Humidity sensors M1 and M2 detect the humidity of each room R1 and R2.

Fire alarms A1 and A2 are attached to the ceilings in the center of rooms R1 and R2, respectively. The fire alarms A1 and A2 are devices that detect fire smoke, and detect the generation of smoke by using diffused reflection of light when it hits smoke particles and output a warning.

Two fluid nozzles N1 and N2 of the sterilizer are arranged in the room R1. Further, in the room R2, two fluid nozzles N3, N4, N5 of the sterilization device are arranged. These two-fluid nozzles N1 to N5 are suspended from the ceiling at a height at which the spray port is below the fire alarms A1 and A2. Each of the two fluid nozzles N1 to N5 sprays the liquid in the direction indicated by the arrow.

<Control of sterilization device 30>
The control of the sterilization apparatus 30 will be described with reference to FIG. The sterilization device 30 includes a control unit 50. The control unit 50 controls humidification and sterilization in the rooms R1 to R3.

The humidity detected by the humidity sensors M1 and M2 and the signal from the motion sensor 60 provided in the rooms R1 and R2 are supplied to the control unit 50. The control unit 50 supplies control signals to the air supply valves V1 to V5, the gas / liquid switching valve 43, the valves 47, 48, and the gas supply valve 36, and of these valves (V1 to V5, 43, 47, 48). Make a switch. Further, the control unit 50 controls the start and stop of the compressor C1.

An operation unit 61 and a display unit 62 are connected to the control unit 50. The operation unit 61 and the display unit 62 are touch panels. The display unit 62 displays the manual start / stop of humidification and sterilization, the current humidity, and the like. The operation unit 61 is used to stop humidification and sterilization, and to change the set humidity in humidification.

The control unit 50 includes a humidification control unit 51, a sterilization control unit 52, and a sterilization condition storage unit 55.
The humidification control unit 51 sprays water to execute the humidification treatment. The humidification control unit 51 stores the set humidity. For example, 50% RH is used as this set humidity. The humidification control unit 51 sprays water from the two fluid nozzles N1 to N5 so that the humidity in the rooms R1 to R3 becomes the set humidity, and humidifies the rooms R1 to R3. Further, the humidification control unit 51 changes the set humidity according to the operation from the operation unit 61.

The sterilization control unit 52 executes a chemical spraying step, a holding step, and a purging step. In the chemical spraying stage, the chemical is sprayed, in the holding stage, the spraying of the chemical is stopped to maintain the state, and in the purge stage, the chemical is discharged from the pipe.

The sterilization control unit 52 stores the time for executing the holding step (holding time) and the time for executing the purge step (purge time), respectively. In this embodiment, 7 minutes is used as the holding time and 15 minutes is used as the purging time. When the chemical solution is sprayed in the purge stage, the humidity of the rooms R1 and R2 rises. Also in this case, the holding time is determined as the time for lowering the relative humidity so that the humidity of the rooms R1 and R2 does not exceed the reference value. In this embodiment, 85% RH is used as a reference value. If the relative humidity in the rooms R1 to R3 is lower than this reference value, the fire alarms A1 and A2 do not output an alarm.

FIG. 4 is a graph showing the relationship between the time from the start of spraying and the relative humidity. In this graph, the chemical spray is 11 minutes, the retention time is 7 minutes, and the purge time is 15 minutes. As shown in this graph, the chemical spray increases the relative humidity, exceeds the relative humidity (70% RH) that can sterilize the rooms R1 to R3, and then decreases the relative humidity. In the purge stage, the relative humidity rises again. Then, in the purge stage, the relative humidity rises again and then falls. Here, by lengthening the holding time, the peak value of relative humidity in the purge stage is lowered. In this embodiment, the peak value in the purge step can be lower than 85% RH with a retention time of 7 minutes.

The sterilization control unit 52 of the present embodiment sprays the chemical solution using the sterilization conditions stored in the sterilization condition storage unit 55.
As shown in FIG. 5, the sterilization condition storage unit 55 stores the sterilization condition. This sterilization condition differs depending on the humidity at the start of sterilization and the rooms R1 and R2. In this embodiment, when the humidity at the start of sterilization is 60% RH (relative humidity 60%) or less as in spring, autumn and winter, the humidity is controlled and the sterilization is started as in summer. If the humidity exceeds 60% RH, timer control is performed. In the case of humidity control, the chemical solution is sprayed until the target relative humidity is reached for each of the rooms R1 and R2. When the humidity of the humidity sensors M1 and M2 reaches and exceeds the target relative humidity, the humidity of the rooms R1 to R3 rises even if the spraying is stopped immediately, and the relative humidity after spraying becomes 70% or more. Bacteria can be eradicated. In the case of timer control, the chemical solution is sprayed during the predetermined chemical solution spraying time. In the present embodiment, the target relative humidity in the humidity control of the rooms R1 and R2 is set to 68% RH and 77% RH, respectively, and the chemical spray time in the timer control of the rooms R1 and R2 is set to 12 minutes and 14 minutes, respectively. ..

Next, the process using the sterilizing apparatus of this embodiment will be described with reference to FIGS. 6 and 7. In the present embodiment, the rooms R1 to R3 are humidified to avoid drying during the daytime when there are people, and the sterilization control process is executed at the sterilization start time in the middle of the night. In the present embodiment, by closing the doors D1 and D2 and opening the doors D3 and D4, not only the rooms R1 and R2 but also the room R3 is humidified and sterilized.

<Humidification control process>
As shown in FIG. 6, during the daytime, the control unit 50 executes the humidification control process based on the humidity of the rooms R1 and R2 (step S1). Specifically, the humidification control unit 51 of the control unit 50 acquires the humidity from the humidity sensors M1 and M2. The humidification control unit 51 humidifies when the acquired humidity is lower than the set humidity.

In this case, as shown in FIG. 7A, the humidification control unit 51 of the control unit 50 activates the compressor C1 and connects it to the gas supply pipe 31 by switching the air supply valves V1 to V5 to compress the compressor C1. Air is supplied to each of the two fluid nozzles N1 to N5.

Further, the humidification control unit 51 performs an opening operation of the valve 47 and a closing operation of the valve 48 to supply water from the water pipe W1 to the gas-liquid switching valve 43. Further, the humidification control unit 51 communicates the fluid supply pipe 41 and the connection pipe 44 by the switching operation of the gas / liquid switching valve 43.
As described above, compressed air and water are supplied to the two fluid nozzles N1 to N5, water is sprayed on the rooms R1 to R3, and the humidity of the rooms R1 to R3 rises.

Then, when the humidity of the rooms R1 to R3 reaches the set humidity, the humidification control unit 51 of the control unit 50 stops humidification. Specifically, the humidification control unit 51 opens the two-fluid nozzles N1 to N5 by switching the gas-liquid switching valve 43 and the air supply valves V1 to V5, and stops the compressor C1. As a result, the supply of tap water and compressed air to each of the two fluid nozzles N1 to N5 is stopped, and humidification is stopped.

<Sterilization control processing>
After that, as shown in FIG. 6, when the sterilization start time is reached (when “YES” in step S2), the sterilization control unit 52 executes the acquisition process of the start humidity (step S3). Specifically, first, the sterilization control unit 52 determines whether or not there is a person in the rooms R1 to R3 based on the signal from the motion sensor 60. When it is determined that there are no people in the rooms R1 to R3, the sterilization control unit 52 acquires the humidity of the humidity sensors M1 and M2.

Next, the sterilization control unit 52 executes a determination process of whether or not the acquired starting humidity is 60% RH or less (step S4). Here, when the humidity sensors M1 and M2 are 60% RH or less (when “YES” in step S4), the humidity control process is executed.

Specifically, as shown in FIG. 7B, in this humidity control process, the sterilization control unit 52 activates the compressor C1 and switches the air supply valves V1 to V5 to the gas supply pipe 31. Connected to supply compressed air to each of the two fluid nozzles N1 to N5.

Further, the sterilization control unit 52 supplies compressed air to the chemical solution tank Tc1 by opening the gas supply valve 36, and applies pressure to the chemical solution. Then, the sterilization control unit 52 closes the valve 47 and opens the valve 48. Further, the sterilization control unit 52 connects the fluid supply pipe 41 and the connection pipe 44 by the switching operation of the gas-liquid switching valve 43, and supplies the chemical liquid from the chemical liquid tank Tc1.

As described above, the chemical solution and the compressed air are supplied to the two fluid nozzles N1 to N5, and the chemical solution is sprayed into the rooms R1 and R2 (step S5). Then, the relative humidity of the rooms R1 to R3 rises due to the spraying of the chemical solution.
Then, when the humidity detected from the humidity sensors M1 and M2 does not exceed the target relative humidity (when "NO" in step S6), the sterilization control unit 52 continues to spray the chemical solution.

On the other hand, when the acquired starting humidity exceeds 60% RH (when "NO" in step S4), the sterilization control unit 52 executes the timer control process.

In this timer control process, the sterilization control unit 52 activates the compressor C1 and connects it to the gas supply pipe 31 by switching the air supply valves V1 to V5, as in the humidity control process. Further, the sterilization control unit 52 performs a valve 47 closing operation, a valve 48 opening operation, and a gas-liquid switching valve 43 switching operation. As a result, the chemical solution and the compressed air are supplied to the two fluid nozzles N1 to N5, and the chemical solution is sprayed into the rooms R1 to R3 (step S7).
Then, the sterilization control unit 52 continues to spray the chemical solution from the start of spraying until the spraying time elapses (when “NO” in step S8).

After that, when the target relative humidity is exceeded in the humidity control process, or when the spray time has elapsed in the timer control process (when “YES” in steps S6 and S8), the sterilization control unit 52 performs the holding process. Execute (step S9).

Specifically, the sterilization control unit 52 stops the liquid supply to the gas-liquid switching valve 43 by closing the valves 47 and 48. Further, the sterilization control unit 52 stops the supply of compressed air to each of the two fluid nozzles N1 to N5 by switching the air supply valves V1 to V5, and stops the compressor C1.
As a result, the supply of the liquid and the compressed air is stopped to the two fluid nozzles N1 to N5, and the spraying from the two fluid nozzles N1 to N5 is stopped. Then, the state in which this spraying is stopped is maintained until the holding time elapses.

When the holding time has elapsed, the sterilization control unit 52 executes a purge process (step S10).
Specifically, as shown in FIG. 7 (c), the sterilization control unit 52 activates the compressor C1 and switches the compressed air from the two fluid nozzles N1 to N5 by switching the air supply valves V1 to V5. Supply to. Further, the sterilization control unit 52 communicates the fluid supply pipe 41 and the gas supply pipe 35 by the switching operation of the gas / liquid switching valve 43. In this case, the valves 47 and 48 and the gas supply valve 36 are closed.
As described above, compressed air is supplied to the fluid supply pipe 41, and the chemical solution remaining in the fluid supply pipe 41 is sprayed from the two fluid nozzles N1 to N5.

Then, when the purge time elapses after the start of the purge process, the sterilization control unit 52 opens the two-fluid nozzles N1 to N5 by switching the air supply valves V1 to V5, and stops the compressor C1. As a result, compressed air is not supplied to the two-fluid nozzles N1 to N5, and the spraying from the two-fluid nozzles N1 to N5 ends.
As a result, the sterilization control process is completed, and the next humidification control process (step S1) is prepared.

According to this embodiment, the following effects can be obtained.
(1) The two-fluid nozzles N1 to N5 of the sterilization device 30 of the present embodiment use compressed air to spray water supplied from the water supply pipe 45 to humidify the rooms R1 to R3 and supply the chemical solution. The chemical solution supplied from the tube 46 is sprayed to sterilize the rooms R1 to R3. Thereby, humidification and sterilization can be performed using the same two-fluid nozzles N1 to N5.

(2) In the sterilization device 30 of the present embodiment, the water supply pipe 45 and the chemical liquid supply pipe 46 are connected to the fluid supply pipes 41 connected to the two fluid nozzles N1 to N5 via valves 47 and 48. As a result, water and chemicals can be supplied using the fluid supply pipe 41. In particular, when the installation locations of the two fluid nozzles N1 to N5 are separated from the water pipe W1 and the chemical liquid tank Tc1, the number of pipes can be reduced.

(3) In the present embodiment, the purge process (step S10) is executed after the spraying of the chemical solution (steps S5 and S7) and before the humidification control process (step S1). As a result, the chemical solution remaining in the fluid supply pipe 41 can be discharged.

(4) In the present embodiment, in the purge process (step S10), compressed air is supplied to the fluid supply pipes 41 connected to the two fluid nozzles N1 to N5. As a result, the chemical solution remaining in the fluid supply pipe 41 can be quickly discharged.

(5) In the present embodiment, the holding process (step S9) is executed after the spraying of the chemical solution (steps S5 and S7) and before the purge process (step S10). This makes it possible to suppress an increase in humidity in the purge process (step S10). For example, it is possible to suppress the alarm output of the fire alarms A1 and A2 based on high humidity. Further, the maximum humidity in the purge process (step S10) can be set to the humidity (70% RH) or higher at which sterilization is performed.

Moreover, this embodiment may be changed as follows.
-In the above embodiment, the holding time in the holding treatment after spraying the chemical solution was set to 7 minutes. The holding time is not limited to this, and may be changed depending on the size of the room to be sterilized, the amount of chemical solution, and the like. Further, the purge process may be started based on the humidity detected in the holding process. Specifically, the sterilization control unit 52 of the control unit 50 stores a predetermined relative humidity (purge start humidity) at which the purge is started. Then, in the holding process, the sterilization control unit 52 starts the purge process when the humidity detected from the humidity sensors M1 and M2 is lower than the purge start humidity.

In the above embodiment, in the purge process (step S9), compressed air is supplied from the gas supply pipe 35 to the fluid supply pipe 41, and the chemical solution remaining in the fluid supply pipe 41 is discharged. The fluid used to discharge the chemical solution remaining in the fluid supply pipe 41 is not limited to compressed air, but may be water.

-In the above embodiment, the control unit 50 sprays the chemical solution after confirming that there are no people in the rooms R1 to R3 based on the signal from the motion sensor 60. Confirmation that there is no person before spraying the chemical solution is not limited to the signal from the motion sensor 60, and may be performed based on, for example, opening / closing the doors D1 and D2 and turning off the lights of the rooms R1 to R3.

Further, if the human sensor 60 or the door sensor detects the intrusion of a person during the spraying of the chemical solution, the chemical solution spraying may be stopped. Then, when the absence of a person is detected by the motion sensor 60 after the chemical solution spraying is stopped, the stopped chemical solution spraying is restarted. In this case, the humidity of the humidity sensors M1 and M2 is acquired, spraying is performed until the target relative humidity is reached in the case of humidity control, and re-spraying is performed for the remaining time of the chemical spray in the case of timer control.

-In the above embodiment, tap water was used as the humidifying liquid. The liquid used for humidification is not limited to tap water. For example, a low-concentration sterilizing liquid that does not affect humans or a liquid with a scent such as aroma water may be used.

-In the above embodiment, when the sterilization start time is reached, the control unit 50 executes the chemical spray treatment, the holding treatment, and the purging treatment. The start of the chemical spray, the selection of the chemical spray control (humidity control or timer control), the setting of the chemical spray time, the holding time, the purge time, etc. may be performed by human operation.

A1, A2 ... Fire alarm, C1 ... Compressor, D1, D2, D3, D4 ... Door, M1, M2 ... Humidity sensor, N1, N2, N3, N4, N5 ... Two-fluid nozzle, R1, R2, R3 ... Room , W1 ... water pipe, Ta1 ... air tank, V1, V5: air supply valve, 30 ... sterilization device, 31,35 ... gas supply pipe, 36 ... gas supply valve, 41 ... fluid supply pipe, 43 ... gas liquid switching Valve, 44 ... connection pipe, 45 ... water supply pipe, 46 ... chemical supply pipe, 47, 48 ... valve, 49 ... drain valve, 50 ... control unit, 51 ... humidification control unit, 52 ... sterilization control unit, 55 ... Disinfection condition storage unit, 60 ... Human sensor, 61 ... Operation unit, 62 ... Display unit.

Claims (2)

In a sterilization method in which a space is sterilized by using a two-fluid nozzle connected to a liquid supply pipe to which a chemical solution used for sterilization is supplied and spraying the chemical solution with a gas.
A humidification step in which a humidifying liquid is supplied to the two fluid nozzles from a humidifying liquid supply pipe connected to the liquid supply pipe via a switching valve, and the humidifying liquid is sprayed to humidify the inside of the space. When,
The chemical solution is supplied to the two-fluid nozzle from the chemical solution supply pipe connected to the liquid supply pipe via the switching valve, and the chemical solution is sprayed from the two-fluid nozzle to sterilize the space. A sterilization step including a spraying step and a holding step of stopping spraying from the two-fluid nozzle after the spraying of the chemical solution is completed .
Immediately after the holding step, a purging step of discharging the chemical solution in the liquid supply pipe into the space is executed.
In the holding step, the sterilization method is characterized in that the spraying is continuously stopped for a period of time until the relative humidity of the space in the purging step does not exceed the reference value and falls to the relative humidity . In a sterilization device that is connected to a liquid supply pipe to which a chemical solution used for sterilization is supplied, has a two-fluid nozzle that sprays the chemical solution using a gas, and disinfects a space.
A humidifying liquid supply pipe and a chemical liquid supply pipe connected to the liquid supply pipe via a switching valve,
It is equipped with a control unit that controls the switching of the switching valve.
The control unit
A humidifying liquid is supplied from the humidifying liquid supply pipe to the two-fluid nozzle, the humidifying liquid is sprayed, and a humidification control process for humidifying the inside of the space is executed.
After the chemical solution spraying treatment in which the chemical solution is supplied to the two-fluid nozzle from the chemical solution supply pipe and the chemical solution is sprayed from the two-fluid nozzle to sterilize the space, and the spraying of the chemical solution is completed, the said. Bactericidal treatment, including holding treatment to stop spraying from the two fluid nozzles ,
Immediately after the holding process, a purging process of discharging the chemical solution in the liquid supply pipe into the space is executed.
In the holding process, the sterilizing apparatus is characterized in that the spraying is continuously stopped for a period of time until the relative humidity of the space in the purge process does not exceed the reference value and falls to the relative humidity .

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