... zone) and aeration rate in continuous upflow reactors govern the washout of sludge from the reactor, and therefore, we investigated the effect of surface loading rate and aeration rate on the selection ... decided the control strategy for the selection of well-settling sludge. Then, we applied the strategy to the formation of aerobic granular sludge in a continuous experiment. In addition, the effect ... NaHCO3, and the water temperature was maintained at 22 ± 2°C. Reactor Setup and Operation for the Formation of Aerobic Granular Sludge Two AUFB reactors were used for the formation of aerobic...