Fermentation is more than mixing: it is precise control of the micro-environment. Whether an aerobic process with high gas dispersion or a strictly anaerobic cultivation demanding complete homogeneity — the BMAF is the bottom magnetic agitator on which process stability in the fermenter rests. The series spans pilot scale to industrial production, and every project starts with pre-engineering.
Engineering
In fermentation an off-the-shelf agitator is a risk. Fit-for-purpose optimisation is therefore always part of the scope. From rheology, gassing rate (vvm) and shear sensitivity we define shaft length, impeller spacing and hub connection.
Advantages
Standard sizing provides a safety margin, but rarely peak efficiency. We tune impeller geometry and positioning to the process dynamics. The same result is then often achieved with a leaner drive — using less energy at lower capital cost.
Tall, slender fermenters demand long shafts in highly turbulent conditions. For every BMAF we calculate the critical speed relative to shaft dimensions and bearing reinforcement. Bearing unit and vessel bottom stay free of vibration even under aggressive agitation.
In aerobic processes the introduced gas changes fluid density and with it the load on the magnetic coupling. We calculate the torque curve for the maximum aeration rate. Mass transfer (kLa) is then limited by the biology, not by the drive train.
Impellers
Rather than adapting the biology to a limited catalogue, we select the impeller by its duty in the process.
Hub connection
The joint between shaft and impeller governs sterility and mechanics alike. The right choice depends on whether the plant is dedicated to one process or is to be reconfigured.
Design and documentation
Every BMAF is supplied with a complete validation package. The flange version follows the maintenance concept.
Contact
For pre-engineering we need working volume, vessel geometry, gassing rate and the shear sensitivity of the culture. Tell us what you are fermenting.
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