Study on the Mechanism of Activated Sludge Denitrification by A2O Process Under Strong Solar Radiation in Plateau
The effects of plateau solar radiation on microbial abundance and diversity and metabolism during the do-mestication of activated sludge in an A2O reactor were analyzed by running three parallel A2O units with solar radia-tion,constant temperature,and room temperature in a lateral manner.The results showed that when running to the 40th day,the denitrification effect of the solar radiation A2O reactor was generally worse compared with the constant temper-ature and room temperature units;the number of operational taxonomic units in the solar radiation A2O system was 595,which showed a decreasing trend,and the metabolic functions of the dominant genus of microorganisms were based on the degradation of organic matter,denitrification and denitrification,and the metabolic pathways were based on the carbon and nitrogen metabolism,and it was also found that the relative abundance and diversity of denitrifying bacteria relative abundance increased with the increase of the duration of solar radiation exposure.The bacterial diversi-ty of the solar-radiated A2O system was lower than that of the constant-and room-temperature systems up to 40 days of operation,and the relative abundance of some common dominant genera in sludge was suppressed by solar radiation,but the abundance of some denitrification-related genera and their functional genes were instead enhanced in the solar-radiated reactors.
plateauA2O processsolar radiationmicrobial community characterizationmetabolic pathwaysgene functions
万方数据
