Selection and enrichment of denitrifying phosphate accumulating bacteria in biologically enhanced phosphate removal process
强化生物除磷体系中反硝化聚磷菌的选择与富集

The selection and dominance of denitrifying phosphate accumulating organisms (DNPAOs), which are capable of utilizing nitrate as electron acceptor, was investigated in a laboratory-scale Sequencing Batch Reactor (SBR). The results obtained demonstrated that DNPAOs were already present in the conventional biological phosphorus removal system. The proportion of DNPAOs increased from 15.5% to 73% of total phosphate accumulating organisms after three phase selection. Simultaneous anoxic phosphate uptake and biological denitrification with good performance could be obtained in the anaerobic/anoxic SBR operated in steady-state. The concentration of phosphorus at anoxic end was low than 1?mg/L and phosphorus and nitrate removal efficiency were above 94% and 95% respectively.