污水起始pH值对序批式反应器(SBR)中增强生物除磷过程的影响研究

通过序批式反应器（SBR）的连续运行,研究了污水不同起始pH值对增强生物除磷的影响（SBR1：pH=6.8;SBR2：pH=7.6）.结果表明,在厌氧阶段,SBR2释磷量高于SBR1;在好氧阶段,SBR2降解的聚羟基烷酸（PHA）量低于SBR1,并且糖原合成量/PHA降解量的比例要远远低于SBR1.但是,SBR2反而比SBR1吸收更多的磷.进一步的研究表明,由于SBR2比SBR1合成的糖原少,因此其低PHA降解量并没有导致低吸磷量.推测SBR2中的聚磷菌（PAO）量高于SBR1,从而导致SBR2有着更高的吸磷量以及PHA利用率.在好氧末,SBR2中的可溶解性正磷酸盐（SOP）浓度远远低于SBR1,SBR2的除磷效果达到93.67%,但SBR1仅为65.06%.因此,通过控制污水起始pH值的方法可以达到显著提高增强生物除磷效果的目的,比控制整个污水生物处理过程pH的方法要方便.

Influence of Wastewater Initial pH on Enhanced Biological Phosphorus Removal in Sequencing Batch Reactor (SBR)

Two laboratory-scale sequencing batch reactors (SBRs) were operated continuously to investigate the influence of wastewater initial pH on enhanced biological phosphorus removal (SBR1: pH=6.8; SBR2: pH=7.6). Results show that SBR2 exhibits greater anaerobic phosphorus release than SBR1. During aerobic stage, SBR2 degrades less polyhydroxyalkanoates (PHA) than SBR1, and the ratio of glycogen synthesis to PHA degradation in SBR2 is much less than that of SBR1, but SBR2 takes up more phosphorus. Further studies show that due to less glycogen synthesis in SBR2 than in SBR1, lower PHA degradation in SBR2 doesn't result in lower phosphorus uptake. The higher phosphorus uptake and PHA utilization efficiency in SBR2 is probably caused by its more phosphorus accumulating organisms (PAO). At the end of aerobic phase, SBR2 has significantly higher phosphorus removal efficiency than SBR1 (93.67% against 65.06%). Thus, the efficiency of enhanced biological phosphorus removal can be significantly improved by controlling the initial pH of wastewater. This method is much more convenient than controlling the entire process pH of wastewater biological treatment.