Summary

It appears that aerobic granulation in SBR is driven by selection pressures exerted on microorganisms. According to the information available so far, the major selection pressures responsible for aerobic granulation in SBR include settling time and volume exchange ratio. It was shown that these major selection pressures indeed could be unified into the concept of minimal settling velocity of bioparticles that determines aerobic granulation in SBR. In addition, EPS seems also to play a certain part in the formation of aerobic granules in SBR.

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