Abstract:A sequencing batch reactor operated in single-stage oxic process was conducted to examine its feasibility and stability for the treatment of real domestic wastewater. And meanwhile, the system performance was compared with the traditional anaerobic/aerobic process. The laboratory results showed that 98.6% of the highest efficiency of phosphorus removal could be achieved in the single-stage oxic process when the TP concentration of the influent ranged from 2 to 10 mg/L, and simultaneous removal of nitrogen and phosphorus could be well realized during long-term operation, the average removal rates of NH4+-N, TN and COD were found to be higher than 92%, 87% and 90%, respectively. Although the two processes had the approximate phosphorus removal rate, the single-stage oxic process, in which without anaerobic phase, had an obvious economic advantage over anaerobic/aerobic process due to its lower running cost.