Operation Stability and Functional Bacterial Structure in Short Cut Nitrification and Denitrification Process
Three laboratory-scale upflow reactors were constructed treating synthetic wastewater,experi-mental results showed that the operation performance of short-cut nitrification reactor fluctuated greatly with an average NH4+-N removal efficiency(ARE)of 58.2%±19.0%.The ARE of shortcut nitrification and denitrifi-cation system was 41.4%±12.2%with the total nitrogen(TN)removal efficiency of 85.6%±5.4%.Nearly no NO2--N accumulation was observed.Short-cut denitrification reactor had good operation performance with NO2--N removal efficiency of 99.7%±0.5%.Bacteria belonged to Proteobacteria phylum had the maximum rel-ative abundance(RA)of 42.91%and 64.23%in short-cut nitrification sludge and short-cut denitrification sludge,respectively.In short-cut nitrification and denitrification sludge,Firmicutes(44.48%)and Proteobacteria(30.28%)were the dominant phyla.At genus level,the dominant genera in short-cut nitrification sludge were Ni-trospira(9.30%)and Nitrosomonas(5.41%).The dominant genera of short-cut denitrification sludge were Tri-chococcus(24.94%),Desulfomicrobium(10.76%)and Macellibacteroides(5.83%).The dominant genera of short-cut nitrification and denitrification sludge were Trichococcus(20.96%),Desulfomicrobium(16.72%)and Aeromonas(5.38%).
denitrification systemoperation performancenitrogen removalfunctional bacterial community
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