同步硝化反硝化除磷颗粒污泥的快速启动与强化

Rapid start-up and enhancement of simultaneous nitrification-denitrification phosphorus removal granular sludge

为了探究同步硝化反硝化除磷颗粒污泥系统的快速启动,本研究首先通过饥饿-饱食、逐步缩短沉淀时间的培养方式进行污泥造粒;其次通过定期投加30mg/L的NO_(2)--N,提供高浓度亚硝酸盐环境以强化氮磷去除;最后进一步提高系统氮负荷,考察其运行氮磷去除效率。系统在28天的培养下实现污泥快速颗粒化,MLSS稳定在5.6~6.2g/L,SVI30/SVI5达到0.96,颗粒沉降性能良好。通过亚硝酸盐强化,系统厌氧释磷量从3.51mg/L提升至29.4mg/L,同时NOB活性被抑制,实现短程硝化反硝化除磷。系统在C/N/P质量比为420/80/10的条件下,实现了99.85%的总氮去除与99.43%的磷去除。微生物群落分析表示在该启动策略下Acinetobacter菌属占据主导地位。

In order to explore the rapid start-up of simultaneous nitrification-denitrification phosphorus removal granular sludge system,this study first cultivated sludge granulation through starvation-repletion and gradually shortened sedimentation time.By regularly adding 30 mg/L NO_(2)--N,a high concentration of nitrite environment was provided to enhance nitrogen and phosphorus removal.The nitrogen load of the system was further increased to examine its nitrogen and phosphorus removal efficiency.The system achieved rapid sludge granulation after 28 days of cultivation,with MLSS stabilized at 5.6-6.2g/L and SVI30/SVI5 reaching 0.96,indicating good particle settling performance.Through nitrite enhancement,the anaerobic phosphorus release of the system increased from 3.51mg/L to 29.4mg/L,while NOB activity was inhibited,achieving short-cut nitrification-denitrification phosphorus removal.Under the condition of C/N/P=420/80/10(w/w/w),the system achieved 99.85%total nitrogen removal and 99.43%phosphorus removal.Microbial community analysis revealed that the genus Acinetobacter predominated under this initiation strategy.