The quality standards for purified air for biological fermentation mainly include sterility, dryness, a certain temperature and a certain pressure
[1] Sterility: During the fermentation process, the air must be strictly filtered and sterilized to ensure that no microorganisms are introduced, thus avoiding contamination of the fermentation process. The requirement of sterility is reflected in the cleanliness of the air, which generally requires that only one bacteria is allowed to pass through in 1000 service cycles, that is, the sterility of the filtered air is N=10^-3 1
[2] Drying: During the fermentation process, the relative humidity of the air should be controlled at ≦70% to ensure the dryness of the air and avoid excessive humidity affecting the fermentation process
A certain temperature: the air temperature entering the fermenter can be 10~30 °C higher than the incubation temperature, which is to adapt to the temperature requirements of different fermentation processes and ensure that the fermentation process is carried out at a suitable temperature
A certain pressure: the pressure of the air is generally 0.2~0.4 MPa, and a certain positive pressure is maintained to help prevent the entry of external pollutants.
In addition, the purified air used for fermentation also needs to be compressed by oil-free lubricating air, stored in tanks, cooled, primary filtration, secondary filtration, etc., to ensure that the quality of the air meets the needs of the fermentation process.
These treatment steps are designed to remove microorganisms, dust, and other contaminants from the air, providing a clean, sterile environment for the fermentation process
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