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The microbial diversity of groundwater and iron manganese sand filtered water in rural water supply project

Microorganism was an important part of groundwater pollution, which was related to the safety of drinking water. In rural water supply project, to identify the microbial community structure of groundwater source water and manganese sand filtered water, the structures of the microbial communities were illustrated through 16S rRNA sequencing using the Illumina MiSeq platform. The results showed that, the biodiversity of groundwater samples containing Fe 2+ and Mn 2+ was higher than those without Fe 2+ and Mn 2+ . In the same water supply project, the biodiversity of source water was higher than that of manganese sand filtered water. When the abundance of genus level was more than 1%, the six water samples have high biodiversity at the genus level, which were composed of 66 genera. Bacteria phylum that may contain pathogenic microorganisms were detected in water source and manganese sand filtered water samples. Although no coliform was detected, disinfection was also necessary. The influence order of water quality factors on microbial commu- nity was DO > COD > TN > Mn 2+ > Fe 2+ (DO – Dissolved oxygen; COD – Chemical oxygen demand; TN – Total nitrogen). In the same water supply project, the correlation between water source and filtered water sample was consistent with water quality factors, that is, DO, Mn 2+ and Fe 2+ were positively correlated. Actinomycetales, Rhodobacterales, norank_