How to use ozone for sterilization in a clean workshop

How to ensure the quality of products such as food and medicine companies, the use of ozone generators for disinfection of food, pharmaceutical production and packaging workshops, locker rooms, warehouses, etc. is an internationally recognized safe and reliable method, and is also certified by QS, GMP, HACCP, etc. A basic requirement. In fact, many domestic enterprises do not know much about ozone disinfection and sterilization, and are also misled by some ozone generator manufacturers or design units. Therefore, many users are not standardized and unscientific in the purchase and use of ozone generators. , can not achieve the expected disinfection and sterilization effect.

First, the necessity of ozone disinfection

The traditional disinfection method of domestic food and pharmaceutical companies is to use ultraviolet light to illuminate, but the disinfection effect of ultraviolet light is affected by many factors, such as irradiation intensity, distance, etc., and it is easy to have a disinfection dead angle. Ozone has the advantages of rapid sterilization and sterilization (3000 times UV, 600 times chlorine), no dead angle, no residue, and convenient use. Therefore, in recent years, the state inspection, quality, health and other regulatory authorities have explicitly required relevant enterprises to eliminate UV lamps. It is recommended to use ozone generators to sterilize space and production water.

Second, the relevant standards for ozone disinfection

Refer to the National Institute of Health's "Disinfection Technical Specifications" and QS, GMP, HACCP and other certification requirements, when using ozone to clean the clean room (cleanliness below 300,000), the ozone concentration in the workshop should reach or exceed 10mg/m3 The concentration standard; and after reaching this standard, continue to be sterilized for 30 minutes. If the items in the premises are disinfected, the concentration of ozone should be appropriately increased. For workshops with high cleanliness, such as 100,000 and 10,000 workshops, the ozone concentration should be increased to 20-30mg/m3.

Third, factors affecting ozone disinfection and precautions

In practical applications, the factors affecting the disinfection effect of ozone mainly include the following aspects.

Ozone dosage

Space disinfection is that if the dosage of ozone does not reach the standard value, the ozone concentration in the space will not reach the required standard, and the disinfection effect will be affected. When calculating the dosage of ozone, it is necessary to consider the comprehensive factors such as the loss of ozone during transportation, the leakage of doors and windows, and also ensure that the selected ozone generator can achieve the designed ozone production.

2. Ozone uniformity

In the disinfection space, it is necessary to ensure that the ozone concentration in all corners can reach the disinfection standard, otherwise the disinfection effect is still very poor. For this reason, when designing the disinfection plan, factors such as the structure of the workshop, the mode of ozone dosing, and the performance of the ozone generator must be carefully considered. The ozone generator must have the ability to transport ozone over long distances. If the space is disinfected, the ozone generator of the air source should be used. If the workshop has a fresh air system, of course, the ozone generator can be connected to the air outlet; if there is no fresh air system, The way to lay the pipeline is chosen, but the amount of ozone added is slightly larger than the standard dose.

3. Time of ozone disinfection

Although the disinfection and sterilization of ozone is completed in an instant, the ozone concentration needs to accumulate in the space for a certain period of time. If the disinfection time is insufficient, the disinfection effect will be affected. It is generally required that the ozone generator be shut down for half an hour to an hour, and it is still necessary to close the doors and windows.

4. Performance of the ozone generator

If the performance of the ozone generator is poor, the ozone production will be drastically reduced after a certain period of use, and the disinfection effect will not be guaranteed. The core components of the ozone generator are the ozone discharge body and the special power supply. Therefore, when purchasing, you should choose a reliable ozone generator manufacturer, and consider the matching of the ozone discharge body and the power supply.

5. Other

The ambient temperature, humidity, degree of sealing, air cleanliness, etc. in the space all affect the disinfection effect of ozone. The ambient temperature of the ozone generator should not exceed 40 degrees Celsius, the humidity is better between 60% and 80%, and the air is filtered and purified.

Fourth, the types and characteristics of ozone generators

1. Central air conditioner built-in ozone generator

The ozone generator is placed inside the central air-conditioning air supply duct or the return air duct, and the ozone generated by the ozone generator is used to transport the ozone generated by the ozone generator to the workshop to be disinfected. This ozone generator is simple to use, and ozone gas can be easily delivered to a workshop that requires disinfection.

However, since it is placed in the air-conditioning duct, it is not easy to detect when the fault occurs, and the maintenance is not convenient. In addition, if the air-conditioning wind is unclean, the damage to the ozone discharge body and other accessories is very serious. So this way has gradually been eliminated.

2. Central air conditioning external ozone generator

The ozone outlet of the ozone generator is sent to the central air-conditioning air supply duct through the pipeline. Compared with the built-in ozone generator, this method is not only convenient for installation and maintenance, but also the ozone generator is not affected by the air-conditioning wind.

If there is no central air conditioning, you can lay pipes in the higher part of the workshop, open holes in the pipes, and also transport ozone to the entire space. This method has several advantages: one is to transport ozone over long distances and evenly distribute ozone; the other is that an ozone generator can disinfect multiple workshops or only for specific workshops; The generator is placed outside the disinfected workshop to avoid damage to the ozone generator caused by the wetness of the workshop.

3. Wall-mounted ozone disinfection machine

The ozone disinfection machine is hung in the high part of the wall in the workshop, and the ozone gas is blown into the workshop through the fan built in the ozone disinfection machine . Due to the limitations of structure and wind power, this ozone disinfection machine is only suitable for sterilization and deodorization of small spaces. When the workshop area is large, it is necessary to install multiple units to achieve the disinfection effect.

4. Portable ozone generator

The ozone disinfection machine with a handle on the upper part can be moved to the space where disinfection is required. Since ozone is heavier than air, when disinfecting the space, Zui puts the ozone generator in a higher position. This ozone generator is similar to the wall mount type, but it is more mobile and suitable for use in small spaces.

V. Calculation of ozone dosage

The amount of ozone added needs to be determined according to the size of the workshop and the disinfection time. For example, if an ordinary 1000 cubic meter workshop is disinfected for one hour (excluding 30 minutes of ozone disinfection time), then the 1000 cubic meter workshop needs to be within one hour according to the ozone concentration of not less than 10 mg/m3. 10,000 mg of ozone (i.e., 10 g) was charged. If it is a way of laying pipes, it is necessary to increase the amount of ozone added by 20%-30%.

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