In this paper

the effect of aeration rate

C/N ratio and the concentration of nitrogen and phosphorus at inflow point on the performance of a sequencing batch moving bed biofilm reactor(SBMBBR) was studied

and the mechanism of pollutants removal for hybrid microorganism system was also discussed.The experimental results demonstrated that nitrogen removal took mainly place in aerobic phase by simultaneous nitrification and denitrification(SND)

while phosphorus removal carried out by conventional bio-dephosphorization and denitrifying phosphorus removal.The fluidized state of bed and DO concentration in the mixed liquid were affected by aeration rate.If good fluidized state could be kept(4.8—9.0 L·L-1·h-1 of aeration rate)

denitrification could be improved with aeration rate decreased

while for nitrification and TP removal there was no obvious effect.If anaerobic/oxic sequencing batch operation mode was adopted

organics in influent water could be preferentially utilized by denitrifying phosphorus accumulating organisms

and the need of extra carbon for denitrification could be decreased.At 2.8—4.0 of C/N ratio in influent water a good nitrification

denitrification and TN removal could be obtained

and at 1.5 of C/N ratio

efficiency of denitrifying and TP removal deteriorated

at 7.4

both that of nitrifying and denitrifying decreased.With rising of nitrogen and phosphorus concentrations at inflow point

rate of phosphorus removal was not change while nitrogen removal poor

the maximum rate was 0.17 kg TN·m-3·d-1 and 0.06 kg TP·m-3·d-1 for nitrogen and phosphorus removal

respectively.