中文摘要：

为提高微污染原水输水安全性,采用生物膜环状反应器（biofilm annular reactor,BAR）模拟原水输水管网,研究溶解氧（DO）对出水水质及生物膜微生物的影响,运用454-高通量测序技术对生物膜的微生物多样性和丰度进行分析.结果表明：随着溶解氧浓度的提高,反应器出水浊度、总铁、氨氮大幅度下降,该过程对总氮和CODMn去除的影响并不明显;生物膜中的铁细菌、硫酸盐还原菌的量均随溶解氧浓度的提高而降低,而微生物多样性和丰度（如硝化细菌）随溶解氧质量浓度的提高而升高.提高溶解氧能够缓解管道腐蚀,提高管壁生物膜的净水作用.

英文摘要：

To improve the safety of distributing raw water, a BAR（Biofilm Annular Reactor）was constructed to simulate the distribution system and the effect of dissolved oxygen （ DO） concentration on the effluent water quality and biofilm was studied. The 454-pyrosequencing technology was employed to analyze the diversity of biofilm in the reactor. Experimental results showed that the turbidity and the concentration of total iron, ammonia nitrogen decreased obviously with DO concentration increasing, while the concentrations of total nitrogen and CODMn changed slightly. The numbers of iron bacteria and sulfate-reducing bacteria reduced significantly, while the richness and diversity of the biofilm related bacteria （ such as nitrifying bacteria ） improved. So, increasing DO concentration can alleviate the pipeline corrosion and develop biofilm purifying water role.