The feasibility of biological phosphorus removal with carbon source in anaerobic/oxoc(A/O) and oxic/entended idle process was researched by comparing biological phosphorus removal efficiency, unit cycle change of nutrients and intracellular polymer, and the key enzyme activities using synthetic wastewater as a research object. The results showed that starch could be used as carbon source for BPR, the efficiencies of BPR in A/O and oxic/extended idle process were 91.5% and 96.5%, respectively. More polyphosp...