System and method for detecting concentration of peracetic acid disinfectant in real time

Abstract

The invention discloses a peroxyacetic acid disinfectant concentration real-time detection system and method, the system comprises a pure water purification unit and a mixing detection unit, the pure water purification unit comprises an ultrasonic degassing device, an activated carbon adsorption tank, an ion removal device, a water quality detection device and a water tank which are connected in sequence, and the ultrasonic degassing device is connected with a water inlet pipeline; the mixing detection unit comprises a mixing chamber, the mixing chamber is connected with the water tank and is connected with a peracetic acid solution feeding pipeline, and the mixing chamber is provided with a stirring device and a hydrogen ion concentration detection device; the mixing chamber is connected with a liquid outlet pipeline, the liquid outlet pipeline is respectively connected with two branch pipelines, one branch pipeline is provided with a vortex generator, the two branch pipelines are connected with the mixing chamber through a backflow pipeline, and the backflow pipeline is provided with a centrifugal pump. The problems of inaccuracy and subjectivity of manual detection, inconsistency of test paper and the like are reduced, the detection result is not influenced by impurity components in pure water, the detection method is easy to operate, and the technical requirements on operators are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of peracetic acid disinfectant concentration detection, and in particular to a peracetic acid disinfectant concentration real-time detection system and detection method. Background Art

[0002] Peracetic acid, a potent chemical disinfectant, holds a key position in the disinfection and sterilization field due to its powerful oxidizing capacity. It can rapidly penetrate bacterial cell walls and membranes, oxidizing and destroying the organic matter within, thereby killing the bacteria. Furthermore, peracetic acid effectively damages the protein coat and nucleic acid of viruses, rendering them inactive and achieving a highly effective inactivation effect. For this reason, peracetic acid is widely used in various fields, including water treatment and healthcare, to disinfect drinking water, medical devices, and other applications, safeguarding public health and safety.

[0003] In practical applications, the concentration of peracetic acid disinfectant is directly related to its effectiveness in disinfection and sterilization. Too low a concentration can ineffectively kill pathogens, resulting in disinfection failure. Too high a concentration can harm human health and the environment, while also wasting resources. Therefore, real-time monitoring of peracetic acid disinfectant concentration to ensure it achieves the desired treatment effect is crucial.

[0004] Real-time monitoring not only allows for the timely detection of concentration anomalies, enabling adjustments to ensure smooth disinfection and sterilization, but also provides data support for optimizing the disinfection process, improving its efficiency and quality. Furthermore, real-time monitoring facilitates automated and intelligent control of the disinfection process, reducing manual intervention and operational risks.

[0005] However, the current methods for detecting the concentration of peracetic acid disinfectants on the market are relatively simple, and most still use chemical test paper. Although this method is simple to operate, it has many disadvantages:

[0006] 1) Low sensitivity: Chemical test paper has limited sensitivity and is difficult to accurately detect low concentrations of peracetic acid, resulting in large deviations in test results.

[0007] 2) Poor accuracy: The color change of the test paper is affected by many factors, such as ambient temperature and humidity, which affects the accuracy of the test results.

[0008] 3) Human factors have a great influence: the color contrast of test strips is highly subjective, and the judgment standards of different operators may vary, resulting in inconsistent test results.

[0009] 4) High technical requirements for operators: Correct use of chemical test paper requires certain professional knowledge and operating skills, otherwise it is easy to cause detection errors.

[0010] 5) Shelf life of test paper: Chemical test paper has a certain shelf life. After the expiration date, its performance will decline, affecting the accuracy of the test results.

[0011] In view of the above problems, it is particularly urgent to develop a method that can detect the concentration of peracetic acid disinfectant in real time, accurately and stably. Summary of the Invention

[0012] The technical problem to be solved by the present invention is to overcome the shortcomings of the existing technology and provide a real-time detection system and method for the concentration of peracetic acid disinfectant, thereby reducing problems such as inaccuracy in manual detection, subjectivity in color interpretation, and inconsistency in test strips. Pure water is purified so that the real-time detection of the concentration of peracetic acid disinfectant is not affected by impurities in the pure water, thereby reducing interference of external factors on the detection results. The detection method is easy to operate, simplifies the operation process, and reduces the technical requirements for operators.

[0013] The technical solution of the present invention is:

[0014] On the one hand, the present invention provides a real-time detection system and method for the concentration of peracetic acid disinfectant, comprising a pure water purification unit and a mixing detection unit, wherein the pure water purification unit comprises an ultrasonic degassing device, an activated carbon adsorption tank, an ion removal device, a water quality detection device and a water tank connected in sequence by pipelines, and the ultrasonic degassing device is connected to a water inlet pipeline; the mixing detection unit comprises a mixing chamber, which is connected to the water tank through a pipeline and is connected to a peracetic acid solution feed pipeline, and is provided with a stirring device and a hydrogen ion concentration detection device; the mixing chamber is connected to a liquid outlet pipeline, and the liquid outlet pipeline is respectively connected to two branch pipelines, one of which is provided with a vortex generator, and the two branch pipelines are connected to the mixing chamber through a return pipeline, and the return pipeline is provided with a centrifugal pump.

[0015] Preferably, the ultrasonic degassing device includes a degassing cabin, the degassing cabin is provided with a plurality of ultrasonic transducers, the top of the degassing cabin is connected to a gas collecting tank via a pipeline, and a vacuum pump is provided on the pipeline.

[0016] Preferably, the ion removal device includes a shell in which an ion exchange resin is arranged; the water quality detection device includes a temporary storage tank in which a conductivity meter is arranged; and the water tank is provided with a temperature sensor.

[0017] Preferably, a water flow rectifier is provided at the inlet of the liquid outlet pipe and the outlet of the return pipe respectively.

[0018] Preferably, an electric valve is provided at the inlet of the return pipe, and a flow meter is provided on the return pipe.

[0019] Preferably, the mixing chamber is provided with a temperature sensor, a cooling water pipe and a heating water pipe.

[0020] Preferably, the mixing chamber is provided with several ultrasonic probes.

[0021] Preferably, a Teflon coating is provided on the inner wall of the branch pipe, the diameter of one branch pipe is 10 mm, the diameter of the other branch pipe is 6 mm, and the vortex generator is provided on the branch pipe.

[0022] In another aspect, the present invention provides a method for real-time detection of the concentration of peracetic acid disinfectant, which is performed using the above-mentioned real-time detection system for peracetic acid disinfectant concentration, comprising the following steps:

[0023] S1 Pure Water Purification: Pure water enters the ultrasonic degassing device through the water inlet pipe for degassing treatment, then passes through the activated carbon adsorption tank to adsorb organic matter, and the ion removal device to remove ions in the pure water, and then enters the water quality detection device to detect whether the water quality is qualified. Finally, the pure water with qualified water quality is stored in the water tank;

[0024] S2 concentration detection: Pure water and peracetic acid solution enter the mixing chamber through the water tank and the peracetic acid solution feed pipe respectively, are mixed under stirring to form a mixed liquid, and enter the two branch pipes respectively through the liquid outlet pipe. Under the action of the vortex generator, the pure water and peracetic acid solution are fully mixed, and then return to the mixing chamber through the reflux pipe, thereby circulating; during the circulation process, the hydrogen ion concentration detection device in the mixing chamber detects the hydrogen ion concentration in the mixed liquid in real time and feeds back the signal to the control system. When the detected hydrogen ion concentration reaches a stable value, the control system calculates the concentration of peracetic acid in the mixed liquid based on the hydrogen ion concentration.

[0025] Preferably, in step S2, if the concentration of the peracetic acid disinfectant is less than the preset standard value, the peracetic acid solution is continued to be added to the mixing chamber, and then the circulation is continued until the concentration of the peracetic acid disinfectant reaches the preset standard value.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] To address the current bottlenecks in the field of peracetic acid concentration detection, such as low detection accuracy, poor real-time performance, and strong environmental interference (large detection deviations due to water temperature fluctuations), the present invention provides a real-time detection system and method for peracetic acid disinfectant concentration. These systems can detect the concentration of peracetic acid disinfectant in real time, ensuring disinfection effectiveness in practical applications while reducing issues such as inaccuracy in manual detection, subjectivity in color interpretation, and inconsistency in test strips. Furthermore, the present invention purifies pure water, ensuring that the real-time detection of peracetic acid disinfectant concentration is unaffected by impurities in the pure water, reducing interference from external factors on the test results. The detection method of the present invention is easy to operate, simplifies the operational process, and reduces the technical requirements for operators. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of the real-time detection system for peracetic acid disinfectant concentration of the present invention.

[0029] In the figure, 101 is a degassing chamber; 102 is an ultrasonic transducer; 103 is a gas collecting tank; 104 is a vacuum pump; 2 is an activated carbon adsorption tank; 3 is an ion removal device; 401 is a temporary storage tank; 402 is a conductivity meter; 5 is a water tank; 6 is a water inlet pipe; 7 is a mixing chamber; 8 is a peracetic acid solution feed pipe; 9 is a stirring device; 10 is a hydrogen ion concentration detection device; 11 is a liquid outlet pipe; 12 is a branch pipe; 13 is a vortex generator; 14 is a return pipe; 15 is a temperature sensor; 16 is a water flow rectifier; 17 is an electric valve; 18 is a flow meter; 19 is a centrifugal pump. DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention.

[0031] Example 1

[0032] The real-time detection method for the concentration of peracetic acid disinfectant in this embodiment is performed using the following real-time detection system for the concentration of peracetic acid disinfectant: the real-time detection system for the concentration of peracetic acid disinfectant includes a pure water purification unit and a mixing detection unit. Pure water is first purified by the pure water purification unit and then enters the mixing detection unit together with the peracetic acid solution for mixed detection.

[0033] Among them, such as Figure 1 As shown, the pure water purification unit includes an ultrasonic degassing device, an activated carbon adsorption tank 2, an ion removal device 3, a water quality detection device, and a water tank 5, which are sequentially connected by pipes. The ultrasonic degassing device is connected to a water inlet pipe 6. After entering the ultrasonic degassing device through the water inlet pipe 6 for degassing, the pure water passes through the activated carbon adsorption tank 2 to absorb organic matter, and the ion removal device 3 to remove ions in the pure water. After that, the water enters the water quality detection device to test whether the water quality is qualified. Finally, the qualified pure water is stored in the water tank 5.

[0034] Specifically, if Figure 1As shown, the ultrasonic degassing device includes a degassing chamber 101 equipped with several ultrasonic transducers 102. The top of the chamber 101 is connected to a gas collection tank 103 via a pipe, which is equipped with a vacuum pump 104. When pure water enters the chamber 101, the ultrasonic transducers 102 emit 28kHz ultrasonic waves, inducing the formation of microbubbles in the air in the pure water. The exhausted gas is then collected in the gas collection tank 103 by the vacuum pump 104, thereby eliminating the oxygen and carbon dioxide dissolved in the pure water and preventing them from interfering with the final concentration measurement.

[0035] The ion removal device 3 includes a housing containing an ion exchange resin. The ion exchange resin absorbs cations such as calcium and magnesium ions and anions such as chloride and sulfate in the water, ensuring the stability and accuracy of the hydrogen ion concentration detection in the final peracetic acid disinfectant.

[0036] like Figure 1 As shown, the water quality testing device includes a temporary storage tank 401 equipped with a conductivity meter 402. By testing the conductivity of ions in the water, it can reflect the residual level of dissolved ions in the water and verify the effectiveness of ion removal. A conductivity standard value can be preset in the control system. If the measured conductivity does not reach the standard value, the pure water in the temporary storage tank 401 is returned to the ion removal device 3 for further ion removal until the conductivity reaches the standard value.

[0037] like Figure 1 As shown, the water tank 5 is provided with a temperature sensor 15, which can detect the temperature of the purified pure water to determine whether the mixed liquid needs to be heated or cooled during subsequent mixing.

[0038] like Figure 1As shown, the mixing detection unit includes a mixing chamber 7, which is connected to a water tank 5 via a pipeline and is connected to a peracetic acid solution feed pipeline 8. The mixing chamber 7 is provided with a stirring device 9, a temperature sensor 15, a cooling water pipe, a heating water pipe, and a hydrogen ion concentration detection device 10 (a hydrogen ion concentration detector can be used). The pure water and peracetic acid solution entering the mixing chamber 7 are mixed under the stirring action of the stirring device 9 to form a mixed liquid. The mixing chamber 7 is connected to a liquid outlet pipeline 11, and a water flow rectifier 16 is provided at the inlet of the liquid outlet pipeline 11. The liquid outlet pipeline 11 is respectively connected to two branch pipelines 12. The inner walls of the branch pipelines 12 are provided with a Teflon coating to prevent crystals from being adsorbed on the inner walls of the branch pipelines 12, thereby preventing residual crystals. One of the branch pipelines 12 has a diameter of 10 mm, and the other branch pipeline 12 has a diameter of 6 mm. A vortex generator 13 is provided on the branch pipeline 12. The 10mm diameter branch pipe 12 maintains a basic flow rate. The 6mm diameter branch pipe 12 contains a built-in vortex generator 13, which breaks up mixed droplets through the shear force of rotation, effectively shortening the mixing time. The two branch pipes 12 are connected to the mixing chamber 7 via a return pipe 14. The return pipe 14 is equipped with a centrifugal pump 19. The outlet of the return pipe 14 is equipped with a water flow rectifier 16 to eliminate large-scale vortices and reduce turbulence. The inlet of the return pipe 14 is equipped with an electric valve 17, and the return pipe 14 is also equipped with a flow meter 18.

[0039] The mixed liquid formed by pure water and peracetic acid solution flows out of the mixing chamber 7, passes through the water flow rectifier 16 on the liquid outlet pipe 11, and smoothly enters the two branch pipes 12. Under the action of the vortex generator 13, the pure water and peracetic acid solution are quickly and further fully mixed. Subsequently, under the action of the centrifugal pump 19, it passes through the water flow rectifier 16 at the outlet of the return pipe 14, and then smoothly returns to the mixing chamber 7, thus completing the cycle. During the cycle, the hydrogen ion concentration detection device 10 in the mixing chamber 7 can detect the hydrogen ion concentration in the mixed liquid in real time and feed the signal back to the control system. As the cycle progresses, the uniformity of the mixed liquid increases. After the hydrogen ion concentration detected by the hydrogen ion concentration detection device 10 reaches a stable value, the control system calculates the peracetic acid concentration in the mixed liquid based on the hydrogen ion concentration, thereby achieving real-time detection of the peracetic acid disinfectant concentration.

[0040] In addition, a standard value for the concentration of the peracetic acid disinfectant can be set in the control system. If the detected peracetic acid disinfectant concentration is less than the preset standard value, peracetic acid solution is continued to be added to the mixing chamber 7, and the cycle is continued until the peracetic acid disinfectant concentration reaches the preset standard value. The instruments to be disinfected can be placed in the mixing chamber 7 in advance, and then pure water and peracetic acid solution are added. When the peracetic acid disinfectant concentration reaches the standard value, the instruments are disinfected for a period of time, and then the peracetic acid disinfectant is drained and the instruments are removed. The instruments are then cleaned and dried, completing the disinfection of the instruments.

[0041] Furthermore, the mixing chamber 7 is provided with several ultrasonic probes. When the peracetic acid disinfectant in the mixing chamber 7 completes the disinfection of the instrument and is discharged, pure water can be added to the mixing chamber 7, and then ultrasonic waves are emitted through the ultrasonic probe to clean the mixing chamber 7 and the liquid outlet pipe 11, the branch pipe 12 and the return pipe 14.

[0042] Example 2

[0043] Based on Example 1, the concentration of the peracetic acid solution entering the mixing chamber 7 is 8 wt.%, and the amount added is 220 mL; the conductivity of the pure water entering the pure water purification unit is 5 us / cm, the conductivity of the pure water in the temporary storage tank 401 after purification is 2 us / cm, the amount of pure water added to the mixing chamber 7 is 15 L, and the temperature of the water tank 5 and the mixing chamber 7 is 25°C.

[0044] When the peracetic acid solution and pure water are first mixed in the mixing chamber 7, the hydrogen ion concentration measured is 10 -4.1 mol / L, circulated and mixed for 2 minutes at a circulation flow rate of 70L / h, and the hydrogen ion concentration detection device 10 in the mixing chamber 7 finally measured a stable hydrogen ion concentration of 10 -3.5 mol / L, the concentration of the peracetic acid disinfectant obtained after mixing was calculated to be 0.1185wt.% (>the preset standard value of 0.1wt.%). Finally, the concentration of the peracetic acid disinfectant obtained by titration was 0.12wt.%.

[0045] Conduct a bacterial infection experiment on the prepared peracetic acid disinfectant:

[0046] (1) Test reagents: Bacillus subtilis var. niger (ATCC 9372) spores, tryptone soy broth (TSB), neutralizer (a mixture of 0.5 wt.% sodium thiosulfate and 1 wt.% glycine), tryptone soy agar (TSA), and diluent (0.1% peptone in saline).

[0047] (2) Experimental methods

[0048] 1) Inoculate spores of Bacillus subtilis var. niger (ATCC 9372) onto nutrient agar plates and incubate at 37°C for 48 h. Scrape the bacterial moss into 10 mL of sterile saline containing glass beads and shake for 20 min to disperse the spores. Incubate in a 60°C water bath for 30 min (to kill vegetative cells), centrifuge (3000 rpm, 10 min), discard the supernatant, and repeat washing three times. Finally, adjust the spore concentration to 5 × 10 5 -5×10 6 cfu / mL (verified by viable bacteria count method).

[0049] 2) Take 0.02 mL of spore suspension and drip it onto the outer surface of the electronic endoscope and the opening of the forceps, spread it evenly, and place it on a drying table at room temperature until it is dry to prepare the infection carrier for use.

[0050] 3) During the test, one of the electronic endoscopes was disinfected with the prepared peracetic acid disinfectant; the other electronic endoscope was placed on a drying table without any treatment to serve as a positive control.

[0051] 4) After the electronic endoscope is disinfected, put on sterile gloves and remove the sterilized contaminated electronic endoscope. For the outer surface of the electronic endoscope: use a sterile cotton swab to repeatedly wipe the contaminated area of the disinfected electronic endoscope for 20 seconds, then immerse the cotton ball in a sterile water test tube; use a sterile syringe to extract 30mL of diluent, inject it from the inlet of the electronic endoscope biopsy channel, and then use a sterile test tube to collect the sample from the outlet of the biopsy channel as a sample to be tested, and record it for later use. Place the above two test tube solutions in a test tube containing 10mL of neutralizer, knock 200 times, and draw 1mL of eluate to inoculate a plate respectively, and inoculate two plates for each sample.

[0052] 5) For the positive control group, samples were taken from the same part of the positive control electronic endoscope according to the above-mentioned sampling method for cleaning the electronic endoscope, and placed in a room temperature environment without disinfection. After the test group was treated to the longest action time, the control sampling solutions were placed in test tubes containing 10 mL of neutralizer solution, tapped 200 times, and serially diluted 10 times with diluent. The suspension with the appropriate dilution was selected, and 1 mL was aspirated for inoculation on each plate. Two plates were inoculated for each sample.

[0053] 6) Simultaneously, 1 mL each of the neutralizer and diluent for the test disinfectant was aspirated and inoculated into two plates per sample as a negative control group.

[0054] 7) After inoculating each plate, pour 20 mL of TSA into the plate and, after solidification, place the plate in a 37°C incubator for 72 h. Count the colonies and calculate the logarithm of elimination (logarithm of elimination = Log of the number of bacteria recovered before disinfection - Log of the number of bacteria recovered after disinfection).

[0055] (3) Experimental results

[0056] When the electronic endoscope cleaning and disinfection simulated on-site disinfection, bacteria grew in the positive control group within the prescribed action time, and the number of recovered colonies reached 5×10 5 -5×10 6 cfu / sample, the negative control group had no sterile growth, and the logarithmic elimination values of artificially contaminated Bacillus subtilis var. niger spores on the electronic endoscope were all >3 (as shown in Table 1).

[0057] Table 1 Experimental results of positive control group, experimental group and negative control group

[0058]

[0059] (4) Experimental conclusion

[0060] The peracetic acid disinfectant prepared in this example was used to perform a standard disinfection process, and the logarithmic elimination values of the artificially contaminated Bacillus subtilis var. niger spores on the electronic endoscope were all greater than 3, meeting the disinfection requirements.

Claims

1. A real-time detection system for peracetic acid disinfectant concentration, characterized in that: The invention comprises a pure water purification unit and a mixing detection unit. The pure water purification unit comprises an ultrasonic degassing device, an activated carbon adsorption tank (2), an ion removal device (3), a water quality detection device and a water tank (5) which are sequentially connected through pipelines. The ultrasonic degassing device is connected to a water inlet pipeline (6). The mixing detection unit comprises a mixing chamber (7). The mixing chamber (7) is connected to the water tank (5) through a pipeline and is connected to a peracetic acid solution feed pipeline (8). The mixing chamber (7) is provided with a stirring device (9) and a hydrogen ion concentration detection device (10). The mixing chamber (7) is connected to a liquid outlet pipeline (11). The liquid outlet pipeline (11) is respectively connected to two branch pipelines (12). One of the branch pipelines (12) is provided with a vortex generator (13). The two branch pipelines (12) are connected to the mixing chamber (7) through a return pipeline (14). The return pipeline (14) is provided with a centrifugal pump (19).

2. The real-time detection system for peracetic acid disinfectant concentration according to claim 1, wherein: The ultrasonic degassing device comprises a degassing chamber (101), the degassing chamber (101) is provided with a plurality of ultrasonic transducers (102), the top of the degassing chamber (101) is connected to a gas collecting tank (103) via a pipeline, and a vacuum pump (104) is provided on the pipeline.

3. The real-time detection system for peracetic acid disinfectant concentration according to claim 1, wherein: The ion removal device (3) comprises a shell in which an ion exchange resin is arranged; the water quality detection device comprises a temporary storage tank (401) in which a conductivity meter (402) is arranged; and the water tank (5) is provided with a temperature sensor (15).

4. The real-time detection system for peracetic acid disinfectant concentration according to claim 1, wherein: A water flow rectifier (16) is provided at the inlet of the liquid outlet pipe (11) and the outlet of the return pipe (14), respectively.

5. The real-time detection system for peracetic acid disinfectant concentration according to claim 1, wherein: An electric valve (17) is provided at the inlet of the return pipe (14), and a flow meter (18) is provided on the return pipe (14).

6. The real-time detection system for peracetic acid disinfectant concentration according to claim 1, wherein: The mixing chamber (7) is provided with a temperature sensor (15), a cooling water pipe and a heating water pipe.

7. The real-time detection system for peracetic acid disinfectant concentration according to claim 1, wherein: The mixing chamber (7) is provided with a plurality of ultrasonic probes.

8. The real-time detection system for peracetic acid disinfectant concentration according to claim 1, wherein: The inner wall of the branch pipe (12) is provided with a Teflon coating, the diameter of one branch pipe (12) is 10 mm, the diameter of the other branch pipe (12) is 6 mm, and the vortex generator (13) is provided on the branch pipe (12).

9. A method for real-time detection of peracetic acid disinfectant concentration, characterized in that: The detection is performed using the real-time detection system for peracetic acid disinfectant concentration according to any one of claims 1 to 8, comprising the following steps: S1 Pure water purification: Pure water enters the ultrasonic degassing device through the water inlet pipe (6) for degassing treatment, then passes through the activated carbon adsorption tank (2) to adsorb organic matter, and the ion removal device (3) to remove ions in the pure water, and then enters the water quality detection device to detect whether the water quality is qualified. Finally, the pure water with qualified water quality is stored in the water tank (5); S2 concentration detection: pure water and peracetic acid solution enter the mixing chamber (7) through the water tank (5) and the peracetic acid solution feed pipe (8) respectively, are mixed under stirring to form a mixed liquid, and enter the two branch pipes (12) respectively through the liquid outlet pipe (11). Under the action of the vortex generator (13), the pure water and peracetic acid solution are fully mixed, and then flow back to the mixing chamber (7) through the reflux pipe (14), thereby circulating; during the circulation process, the hydrogen ion concentration detection device (10) of the mixing chamber (7) detects the hydrogen ion concentration in the mixed liquid in real time and feeds back the signal to the control system. When the detected hydrogen ion concentration reaches a stable value, the control system calculates the concentration of peracetic acid in the mixed liquid based on the hydrogen ion concentration.

10. The method for real-time detection of peracetic acid disinfectant concentration according to claim 9, wherein: In step S2, if the concentration of the peracetic acid disinfectant is less than the preset standard value, the peracetic acid solution is continued to be added to the mixing chamber (7), and then the circulation is continued until the concentration of the peracetic acid disinfectant reaches the preset standard value.

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