Patent ID: 6793822
Filing Date: 2004-09-21
Classification: C02F,Y02W

Abstract:
A method of producing aerobic biogranules for the treatment of waste water comprising the steps of:a) introducing waste water into a reactor containing an active biomass sludge; b) supplying an oxygen-containing gas to the reactor to provide a mixing action and transfer of dissolved oxygen into the sludge in the waste water, the supply of oxygen containing gas providing a superficial upflow gas velocity above 0.25 cm/s; c) initiating a period of nutrient starvation in the reactor while continuing to supply oxygen-containing gas; d) allowing formed aerobic granules to settle; e) discharging and replacing at least a portion of the waste water; f) repeating steps (a), (b), (c), (d) and (e) until the granules have predetermined physical properties; and g) recovering biomass granules within those predetermied properties.