聚磷菌和聚糖菌的竞争影响因素研究进展

Review on the Factors Affecting the Enrichment Culture of PAOs and GAOs

摘要:

目前, 强化生物除磷工艺(EBPR)以其经济有效而得到广泛的应用, 该工艺关键在于聚磷菌的富集。然而已经发现, 有一类细菌—聚糖菌(GAOs)能够和聚磷菌(PAOs)竞争, 导致除磷效果恶化。关于PAOs-GAOs的竞争, 研究已经很多, 但是其结论有趋同也有矛盾, 有必要对此进行分析讨论。根据近年来国内外的相关报道, 阐述了聚磷菌与聚糖菌的竞争影响因素, 其中碳磷比、碳源种类、温度、pH值是关键因素, 而污泥龄、溶解氧以及水力停留时间等因素对于PAOs和GAOs的竞争也起一定的作用。此外, 在EBPR系统中, 缺氧条件下, 存在反硝化聚磷菌(DPB)和反硝化聚糖菌(DGAO)也会对聚磷菌富集和系统除磷产生影响。最后对EBPR系统未来的发展方向进行了展望。

Abstract:

At present, the enhanced biological phosphorus removal (EBPR) process has been widely used for its cost-effctive, but a type of bacteria-glycogen accumulating organisms(GAOs) which can compete with phosphate accumulating organisms (PAOs) and lead to the deterioration of EBPR. There have been many studies about PAOs-GAOs, the conclusions have both convergences and contradictions however, so it is necessary to discuss and analysis. According to the relevant reports at home and abroad in recent years, the factors affecting the enrichment culture of PAOs and GAOs are expounded, including P/C ratio, carbon type, temperature, pH value which are more important in the system. In addition, sludge age, dissolved oxygen, etc. also played a role for the competition of PAOs and GAOs. In EBPR system, denitrifying phosphate accumulating organisms and denitrifying glycogen accumulating organisms which also have impact on the enrichment of PAOs and dephosphorization were observed in anoxic condition. Finally, the future direction of the EBPR system for the future is viewed.