组合生物膜反应器运行稳定性及微生物群落的研究

Study on the Operation Stability and Microbial Community of a Hybrid Biofilm Reactor

本研究在移动床生物膜反应器(MBBR)独立稳定运行之后,加入折叠曝气生物膜反应器(WFBR),考察了WFBR的加入对COD和NH4+-N去除的影响以及组合生物膜反应器长期运行稳定性和微生物群落变化。结果显示,WFBR加入后COD和NH4+-N去除效率明显提高,但MBBR中微生物群落的丰富度和多样性有所下降,MBBR中最主要微生物由蓝藻门变为变形菌门。组合生物膜反应器运行过程中,COD和NH4+-N去除率分别稳定在90%和99%以上;一个周期内的连续观察证实了WFBR良好的增氧功能;系统中最主要的微生物为α-变形菌纲细菌。

In this study, the waterfall biofilm reactor(WFBR) was installed after the moving bed biofilm reactor(MBBR) operated steadily. The effect of the installation of WFBR on the removal of COD and NH4+-N, the stability of long-term operation and shift of microbial community in hybrid biofilm reactor were investigated. The results showed that the installation of WFBR significantly improved the removal efficiency of COD and NH4+-N. However, the richness and diversity of the microbial community in MBBR decreased, and the predominant microorganisms in MBBR shifted from Cyanobacteria to Proteobacteria. During the phase of combined operation, the removal efficiency of COD and NH4+-N maintained above 90 % and 99 %, respectively. The WFBR showed good function of adding oxygen through continuous observation in an entire operation cycle. The predominant microorganisms in hybrid biofilm reactor were α-Proteobacteria.