(1) The agitator paddles of the universal fermenter are widely used for flat-blade turbine agitating paddles. Most of the domestically used are six-flat blade type, and the size ratio of each part has been standardized. This type of agitating paddle has a large circulating liquid delivery amount and a large power consumption. Therefore, it is especially suitable for the fermentation of filamentous bacteria.
(2) Marine spiral agitator, which has a stronger axial flow than the turbine, but has a low oxygen transmission efficiency.
(3) The vibrating mixer, although providing a higher oxygen transfer efficiency, has a lower shear force.
(4) Multi-bar stirring paddles have been used in fermenters for viscous filamentous Streptomyces fermentation. This type of paddle has better shear dispersibility and lower power consumption, and the power variation is much smaller than that of the turbine throughout the fermentation process.
(5) The gas-introducing agitator consists of a hollow agitating paddle mounted on a hollow agitator shaft. The paddle has at least one opening that is exposed to the liquid. As the paddle rotates, the pressure at the opening decreases, causing the introduced gas to flow down the agitating axis. It is suitable for low viscosity fermentation broth.
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