Enhanced Biological Phosphorus Removal in Single Aerobic Process

When SBR with sodium acetate as the sole carbon source and operated under alternative anaerobic and aerobic condition had achieved a good performance in phosphate removal,it was shifted to completely aerobic treatment system,and found that a good phosphorus removal with removal efficiency of the highest of 73.9%,the lowest of 40% and an average of about 50% was still achieved.The phosphate removal could last 80 cycles before regeneration.Phosphate content of sludge in the SBR increased from 1.43% to 6.56%.PHB and glycogen in the sludge were 27 mg /g and 26 mg /g,respectively.Both of them in the sludge during the whole cycle were of slight variation.Based on analysis of carbon consumption and phosphate absorption as well as their relationship,it is considered that this enhanced biological phosphorus removal in single aerobic process is due to that,the sludge in the system can use ATP released from aerobic oxidation of sodium acetate after acclimation to condition of sodium acetate as the sole carbon to synthesize poly-P granule in cell to a certain content.