Characteristics of the community-structure of A2O processes under different dissolved oxygen conditions in plateau areas

Four Dissolved oxygen (DO) working conditions of 2.0 mg/L, 1.5 mg/L, 1.0 mg/L and 0.5 mg/L were designed in this experiment. The 16SrRNA gene sequencing was performed on sludge from the anaerobic, anoxic and aerobic tanks.

Through the composition analysis of sludge on Phylum level, Class level, Order level, Family level, Genus level and Species level, it can be found that the number of bacterial community at each level of the bacterial community was relatively low. The indicators of community richness, community evenness and community diversity were relatively low compared to other regions. The bacterial communities at different levels are significantly different from the reported dominant community and abundances.