厌氧、缺氧、好氧环境下富磷剩余污泥的释磷机制

以采用A/O生物强化除磷工艺水质净化厂排出的富磷剩余污泥为研究对象，利用棕色消化瓶设计3组释磷试验，讨论厌氧、缺氧、好氧环境下富磷剩余污泥消化释磷的机制. 结果表明:富磷剩余污泥在厌氧和缺氧环境下均有明显的释磷现象，平均释磷速率分别为1.614和0.998 mg/(L·d)；厌氧和缺氧环境下释磷量与聚β-羟基丁酸(PHB)之间的计量关系比较表明，释磷过程中包含有明显的微生物释磷机制，同时还存在着物理化学方面引起的释磷机制，硝酸盐抑制剩余污泥中磷的释放主要是通过影响其微生物学机制完成的. 

Mechanism of Phosphorus Release of Phosphorus-Rich Waste Activated Sludge under Anaerobic, Anoxic and Aerobic Conditions

The phosphorus release mechanism of phosphorus-rich waste activated sludge under anaerobic, anoxic and aerobic conditions was investigated with three brown anaerobic reactors. The waste activated sludge was obtained from a sewage treatment plant in which the A/O process (an enhanced biological phosphorus removal process) was used. The results indicated that the phosphorus release of waste activated sludge could be observed clearly, and the release velocities were 1.614 and 0.998 mg/(L·d) under anaerobic and anoxic conditions respectively.The metrology relationship between the changes of phosphorus and PHB suggested strongly that there were two phosphorus release mechanisms in phosphorus-rich waste activated sludge. One was the microbiological mechanism, which accounted for mainphosphorus release, and the other was physicochemical. The phosphorus release under anoxic conditions was restrained to a certain extent due to the addition ofNO₃^--N.