Study on Sludge and Dissolved Oxygen Distribution in a Full-Scale A2/O Oxidation Ditch

The distribution of velocity, sludge, and dissolved oxygen in a full-scale anaerobic-anoxic-oxic (A2/O) oxidation ditch was numerically simulated under three rotation speed scenarios. viscosity settling rate activated sludge were defined through user-defined function (UDF), the phase calculated using mixture multiphase flow model. Dissolved (DO) set as source (UDS) its generation consumption rates with UDFs. relationship between velocity concentration found to be contradictory, dead zones leading large concentrations at bottom (OD), but not middle-curved wall anoxic pool. reflux slot aerator oxygenation checked correlated DO anaerobic majority concentrated biological selection pool these remained constant bed height. With reduced propeller agitator speed, pool, increased pools.