曝气量对污泥外循环侧流除磷分段进水SBR工艺脱氮除磷性能的影响

Being concerned on the issue of poor performance of nitrogen removal especially of phosphorus removal for low-carbon source wastewater (COD / TN <5, COD <180mg / L), the Phostrip-step-feed-SBR process could obtain a rational distribution of organic carbon source as well as good nitrogen and phosphorus removal effect for low-carbon source wastewater by controlling the aeration amount. The results of studies show that in the condition of the aeration amount be controlled at a level of 3.57 m3/h.m3, the removal efficiencies of the pollutants in low-carbon source wastewater are 86%,98.6%,61.5%,93.6% respectively, when the average concentrations of COD, ammonia nitrogen, TN and TP of the test water are 121 mg / L,29 mg / L,31 mg / L,4.7 mg / L respectively. The studies also find that in Phostrip-step-feed-SBR process, storage of phosphorus in PAOs is broken by enhancing anaerobic phosphorus release of external recycles of sludge and the course of operating side-stream phosphorus removal process is simplified when the phosphorus-rich sludge is recycled externally once a day to remove phosphorus.