Study On The Optimization Of Process Parameters Of Phosphorus Removal By Adding Predominant Bacteria To SBBR

The SBBR process is a combination of submerged biofilm and traditional activated sludge process. On its basis, adding predominant bacteria to SBBR and operates alternately in anaerobic and aerobic, made it more efficient and placid in phosphorus removal in this experiment. The effect of phosphorus and organic matters removal in domestic wastewater by adding predominant bacteria to the sequencing batch reactor of submerged biofilm process is studied in this paper. Firstly, optimal operation cycle has been determined, then the influence of sludge age,dissolved oxygen, CODCr, pH, temperature, C/P on phosphorus removal has been compared when predominant bacteria added and not added in SBBR process. At the same time, the attenuation cycle of predominant bacteria was observed. The study results show that phosphorus removal rate can keep placidly more than 90% in reactor 2 (adding predominant bacteria) , is 20% higher than reactor 1(not adding predominant bacteria).When the carrier packing percentage is 30%, hydraulic retention time(HRT) is 8h(including 3h for anaerobic zone and 7h for aerobic zone), influent pH is 6.5～8.5, and influent DO is 6.0～7.0mg/l, the effluent TP <1.0mg/L, PO43-P<0.5 mg/l, TN<16.0 mg/l, NH4+-N<7.0 mg/l, NO3--N<3.0mg/l, COD<40 mg/l, turbidity <7NTU, chroma <30 C, The water quality of effluent could meet the standard of GB 18918-2002. At last, kinetic modeling of biofilm growth and phosphorus removal in Sequencing Batch Reactor of Submerged Biofilm Process are deduced through the test study and result analysis. Simple technical economy analysis is done.