Standard for quality of sterile air for fermentation

Quality standards for sterile air for fermentation are essential to ensure a smooth fermentation process. The following is a detailed analysis of the quality standards for sterile air for fermentation:

microbial indicators:

the total number of microorganisms in the air should be less than or equal to N/m3 (the specific value can be set according to different application fields, but the requirements are usually very low to ensure a sterile environment for the fermentation process).

There shall be no pathogenic microorganisms or other microorganisms that endanger the fermentation process in the air.

Particulate matter index:

the number of particles with a diameter greater than 5 microns in the air should be less than or equal to N/m3 (the specific value can be set according to different applications).

The number of particles with a diameter greater than 10 microns in the air should be less than or equal to N/m3 (similarly, the specific value should be set according to the application field).

Chemical pollutant indicators:

the air must not contain chemicals harmful to the fermentation process, such as organic solvents, heavy metals, etc.

The oxygen concentration in the air should be within the appropriate range to maintain the normal fermentation process.

Physical parameters:

sterile air for fermentation needs to be provided continuously and maintained at a certain flow rate to ensure the stability of the fermentation process.

The pressure of air is usually required to be between 0.2 and 0.4 MPa to ensure the stable transmission of air in the pipeline.

The temperature of the air entering the fermenter may be 10-30°C higher than the culture temperature, which facilitates the fermentation process.

The relative humidity of the air before entering the filter should be ≤ 70% to prevent the filter from being affected by moisture.

Cleanliness requirements:

sterile air for fermentation is usually required to reach cleanliness level 100, which means that the maximum allowable number of dust particles (≥ 0.5 μm) per cubic meter of air is 3500, and the maximum allowable number of microorganisms is 5 floating bacteria/m & sup3; And 1 settling bacteria/m & sup3;.

Monitoring and management:

appropriate monitoring methods should be used, such as sterile sampling, culture medium, isolation and identification, particle counter, etc., to regularly detect the indicators of microorganisms, particles and chemical pollutants in sterile air.

Appropriate process control measures should be taken during the fermentation process, such as the use of high-efficiency filters, maintaining good cleanliness, etc., to reduce the content of microorganisms and particulate matter in the air.

Periodically conduct sterile air quality testing and record test results. If it is found that the quality of sterile air does not meet the requirements, corrective measures should be taken immediately and its quality should be retested.

Please note that the above criteria may be adjusted depending on the specific application, fermentation process and equipment conditions. In actual operation, corresponding quality standards should be formulated and implemented according to specific conditions.