The presence of oligochaete does not have influence on the removal of COD and NH3-N, but it affects the removal of TP, and the removal of turbidity is affected by the quantity of oligochaete too.
The growth of influent C/N and C/P inhibited the proliferation of the activated sludge by decreasing the influent TN and TP concentration and thereby inhibited the phosphorus release and uptake rates.