| Fluidized-pellet-bed(FPB)bioreactor is an expansion of fluidized-pellet-bed on the field of biological wastewater treatment.It combines naturally the fluidized-pellet-bed highly effective solid/liquid separation technology and activated sludge process,and can accomplish coagulational pelletisation,biological degradation and solid/liquid separation in one unit within a total hydraulic retention time(HRT)of only about 33 minutes.The present research,based on the previous researches,is aimed to determine the removal situation of those main pollutants like COD,NH3-N,TN,TP in FPB bioreactor,and analyze the rule on the removal of those pollutants.The research shows that:(1)For removal of COD in FPB bioreactor,the total removal rate reaches 92.2%; the percentage of removal by coagulation sedimentation,physical adsorption and biochemical effect is 59.4%,16.0%and 16.8%respectively;COD is removed mainly in sections of 0～600mm.(2)For removal of NH3-N in FPB bioreactor,the total removal rate reaches 36.9%;the percentage of removal by coagulation sedimentation,physical adsorption and biochemical effect is 12.4%,12.1%and 12.4%respectively;NH3-N is removed effectively in sections of 0-100mm,600～1100mm;and nitrification is evident in the section of 600～1100mm(3)For removal of TN in FPB bioreactor,the total removal rate reaches 43.8%; the percentage of removal by coagulation sedimentation,physical adsorption and biochemical effect is 20%,20.2%and 3.6%respectively;TN is removed mainly in 0-100mm section;denitrification is insignificant.(4)For removal of TP in FPB bioreactor,the total removal rate reaches 96% above;almost all of the TP is removed by coagulation sedimentation;Most of TP is removed in 0-100mm section by chemical precipitation.
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