Overview of Mechanical Ventilation Fermentation Tank
Mechanical ventilation fermentation tank is a fermentation tank suitable for aerobic microbial fermentation. Due to the continuous need for oxygen during aerobic microbial fermentation, ventilation and dissolved oxygen are required to ensure microbial fermentation. By mechanically stirring, oxygen bubbles can be dispersed, which is beneficial for the liquid to dissolve oxygen, while ventilation ensures the supply of oxygen. Due to the abundance of aerobic microorganisms, mechanical ventilation fermentation tanks are a common type of fermentation tank.
2、 Characteristics of mechanical ventilation fermentation tank
The most prominent feature of a mechanically ventilated fermentation tank is agitation and oxygenation. The function of a stirrer is to break up bubbles, allowing air to come into uniform contact with the solution, and dissolving oxygen in the fermentation broth. There are two types of agitators: axial (blade type, propeller type) and radial (turbine type). Axial agitator: blade type, propeller type. Radial (turbine) agitator (Disc turbine): straight blades, curved blades, arrow blades. Ventilation is achieved by compressing clean air into an air storage tank using an oil-free air compressor, reducing the pressure to 0.30Mpa and sending it to the main air filter and fine air filter. The sterile air produced is then directed to the fermentation tank. The air inside the fermentation tank and seed tank needs to be sterile, because once there are impurities, pollution will occur, harmful microorganisms will multiply, and fermentation will fail. Therefore, sterilization and sterility must be controlled during fermentation. The sterilization of mechanically ventilated fermentation tanks involves both empty sterilization and actual sterilization. Empty sterilization refers to the sterilization of empty tanks by passing clean steam directly into the tank for high-temperature sterilization. Actual sterilization usually involves passing steam through the jacket to raise the temperature to 100 ℃, and then passing steam directly into the tank for sterilization. The mechanical ventilation fermentation tank has a suitable diameter to height ratio. The higher the tank body, the higher the utilization rate of oxygen. Mechanical ventilation fermentation tanks can withstand a certain amount of pressure. Mechanical ventilation must ensure the necessary dissolved oxygen in the fermentation broth, so the selection of air compressor should be appropriate. Mechanical fermentation tanks have sufficient cooling area. The shaft seal of the mixer should be tightly sealed to prevent bacterial contamination and reduce leakage.
3、 Parameter selection table for mechanical ventilation fermentation tank