饮用水常规处理工艺中细菌群落的时空分布

In order to gain insight into the spatiotemporal distribution and dynamic variation of bacterial communities in the conventional treatment process of drinking water, bacterial communities, which were in raw water, settling basin effluent, sand filter effluent and finished water in a conventional treatment process plant in the south of China in summer and winter, were investigated using Illumina HiSeq high throughput sequencing technology. The results showed that pH, turbidity, COD_Mn and total plate count in finished water all met the standards for drinking water quality (GB5749-2006). Bacterial diversity was significantly higher in summer than in winter. In addition, the coagulation sedimentation and disinfection process units had a significant effect on the composition and diversity of bacterial community. Furthermore, the composition of bacterial community varied seasonally, and the dominant bacterial phyla in water samples mainly included Proteobacteria, Actinobacteria and Cyanobacteria, etc, and Proteobacteria predominanted in filter sand biofilm samples. A number of potential pathogens were detected at the genus level, including Vibrio, Acinetobacte and Mycobacterium. Water temperature and dissolved oxygen were the major water characteristics that influenced bacterial community.