Cultivation of Aerobic Granular Sludge under Selective Pressure in a Sequencing Batch Reactor
Aerobic granules were cultivated in the sequencing batch reactor at 15-25°C, pH 7.0 ± 0.1. Settling time decreased from 5 minutes to 1 minute gradually. As increasing the chemical oxygen demand (COD) and NH3-N in influent, COD removal efficiency and mixed liquid suspended solids of the reactor increased. Sludge volume index decreased continuously for a few days and then stabilized at 22 ml g-1. Selective pressure induced by settling velocity was proved to play a crucial role in activated sludge granulation. Based on the continuously measured data, the granulation process was divided into three phases, granules namely initiating, developing and maturating.
K. Z. Su et al., "Cultivation of Aerobic Granular Sludge under Selective Pressure in a Sequencing Batch Reactor", Advanced Materials Research, Vols. 255-260, pp. 3037-3041, 2011