Aerobic granulation has been observed only in the SBRs. However, SBRs cannot replace existing aerobic tanks.Therefore, the feasibility of aerobic granulation in existing continuous systems used in wastewater treatment should be investigated. It is clear that at least two aspects must be taken into account:
1. formation of granules from cells and flocs due to shearing force and physical or physico-chemical interactions combining cells together;
2. continuous selection/recycling of cells, which are forming granules due to cell aggregation.
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