Principle of pasteurization equipment
- 2019-09-05-

Principle of pasteurization device:

The principle of sterilization is that within a certain temperature range, the lower the temperature, the slower the reproduction of bacteria; the higher the temperature, the faster the reproduction. But if the temperature is too high, the bacteria will die. Different bacteria have different suitable growth temperatures and heat and cold resistance. Pasteurization is actually the use of pathogens that are not very heat-resistant. Use appropriate temperature and holding time to kill them all. However, after pasteurization, a small number of harmless or beneficial, heat-resistant bacteria or bacterial spores are still retained

The variety of pasteurization procedures used today. Low temperature long time (LTLT) processing is an intermittent process and is now only used by small dairy plants to produce some cheese products. The "High Temperature Short Time" (HTST) process is an "active" process, usually performed in a plate heat exchanger, and is now widely used in the production of drinking milk. The products obtained by this method are not sterile, that is, they still contain microorganisms, and require refrigeration during storage and handling. "Fast pasteurization" is primarily used in the production of yogurt dairy products.

There are two types of pasteurization methods commonly used internationally:

One is to heat the milk to 62-65 ° C for 30 minutes. This method can kill all kinds of growing pathogenic bacteria in milk, and the sterilization power can reach 97.3% ~ 99.9%. After sterilization, only some of the thermophilic bacteria and heat-resistant bacteria and spores are left. Most of the bacteria are lactic acid bacteria, which are not only harmless to people but beneficial to health.

The second method is to heat the milk to 75 ~ 90 ℃ and keep it for 15 ~ 16 seconds. The sterilization time is shorter and the working power is higher. But the basic principle of sterilization is that you can kill the pathogenic bacteria. If the temperature is too high, there will be more nutrition loss.

Use of pasteurization devices in pharmacopoeial purified water devices:

Pasteurization device: The system is equipped with a plate heat exchanger to systematically pasteurize the quartz sand and activated carbon filter. The activated carbon filter is the place where organic matter, microorganisms and heat sources are concentrated. Activated carbon adsorbs organic matter and suspended particles, not only rich The microorganisms are collected and the favorable conditions for the growth of microorganisms are caused. The procedure of pasteurization is generally 2 hours at 80 ° C. The water is heated to above 80 ° C by a heat exchanger, and then locally circulated by a pump. The microorganisms are sterilized under the action of hot water, and the adsorbed organic matter and bacterial endotoxin are desorbed. Backflushing at the end of the disinfection program not only effectively removes microorganisms, but also plays the role of regenerating activated carbon. At the same time, the raw water inlet temperature can be dispatched (the water temperature can be actively controlled by setting the temperature, and can be reached according to the return water temperature. It automatically measures the sterilization time after the request), and is equipped with a bypass valve for the heat exchanger (when the heat exchanger is cleaned and repaired, it does not affect the normal operation of the device), and has an active cooling control, which can actively stabilize the water temperature. Because the water temperature has a large impact on the water production of the RO membrane, considering that the low temperature can reach minus in winter, it should be equipped with a heat exchanger of the corresponding area during winter operation. Use the heat exchanger to improve the water inlet temperature and keep the RO water inlet temperature. Above 20 ℃ to ensure the water production of RO. When the water temperature is less than 17 ° C, the RO membrane water permeability decreases by about 3% for every 1 ° C drop in temperature. The pasteurization and sterilization of the activated carbon filter is performed by using a steam as a heating source through a plate heat exchanger. The pharmacopoeia purified water device produced by our company uses a new generation of pasteurization equipment, which complies with the 2015 pharmacopoeia purified water specifications in China.

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