Efficient sterilization method of vacuum circulating ozone

Abstract

The invention provides an efficient sterilization method of vacuum circulating ozone. The efficient sterilization method comprises the following steps: activating partial sleeping bacteria or germinating spores in a test product; pouring the dried test product into a sterilization drum, heating in a closed manner, and vacuumizing to eliminate air and moisture in pores of the test product; humidifying and pressurizing the ozone gas, introducing the ozone gas into a temperature control buffer barrel, cooling to 25+ / -2 DEG C, and condensing excessive steam; filling a sterilization rolling barrelwith high-pressure ozone full of water vapor, performing rotary sterilization, meanwhile, discharging the sterilized ozone gas from the other side of the sterilization rolling barrel at a speed lowerthan the gas inlet speed; maintaining the pressure of the sterilization rolling barrel at 1.1-5atm, condensing and drying the discharged ozone gas, enabling the ozone gas to enter an ozone making machine again, circularly making the ozone gas with higher concentration, enabling the ozone gas to enter the sterilization rolling barrel again, and continuously and circularly sterilizing for 15-120 minutes until the sterilization is finished. The ozone can enter tiny holes in each surface of the test product for comprehensive sterilization, which is high in sterilization efficiency, good in sterilization effect and suitable for multi-layer stacked test products such as sheet-shaped test products, particle detected products and powder test products.

Description

【Technical field】 [0001] The invention relates to an ozone sterilization method, in particular to a high-efficiency sterilization method of vacuum circulation ozone. 【Background technique】 [0002] Many substances are not necessarily suitable for high temperature sterilization or radiation irradiation sterilization, and often can only be sterilized at room temperature. Among them, gas sterilization methods, such as ozone or ethylene oxide sterilization methods, are one of the options. However, for general gas sterilization, ethylene oxide is toxic and known as a human carcinogen, which can easily cause central nervous system toxicity and reproductive damage, and is often not suitable for food sterilization. Ozone is a good choice at this time. But ozone is generally only suitable for sterilization in liquids, such as the sterilization of fruits soaked in water. For solids that cannot be soaked in water or powdery substances that are afraid of water, such as garlic flakes o...

AI Technical Summary

Problems solved by technology

[0008] In addition, how ozone sterilization can solve the sterilization problem of endospores has not been studied

Moreover, the highest concentration of ozone introduced in the prior art is about 85ppm, and the ozone sterilization efficiency of this concentration is usually lower than 4log cfu (Bedard: U.S. Patent: Ozone sterilization method; US7582257 B2)

However, in order to achieve effective sterilization efficiency, it needs to be reduced to 6log cfu. To achieve food grade requirements, it must be lower than 100cfu / g, and often requires a sterilization efficiency of 4-6log cfu, which requires more efficient ozone sterilization. There are technologies that cannot solve these technical problems

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