Mixed suspended particles reactors

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In these reactors liquid and solid phase (i.e. cell aggregates or immobilized cells) are completely mixed. Typical examples are fluidized bed reactors (FBR) and stirred tanks. Two phase reactors are generally limited to anaerobic processes because oxygen transfer requires the mixing of three phases. Three phase mixed reactors are widely used in fluidized, semi-fluidized or expanded bed reactors in which the particles are suspended and mixed by the upflow of gas and liquid. The flow pattern and consequently the liquid mixing and gas hold-up depends on the particle density and flow rates. Particle density can be altered during the operation of the reactor due to the growth of the biofilm making the reactor design complicated.

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