Impact of Aeration Methods on Denitrifying Performance During Aerobic Fluidized Bed Biofilm Reactor for Wastewater Treatment
In this study,the impact of varying aeration intensity,pore spacing,and pore size on denitrification effi-ciency and rate,microbial community composition and relative abundance of denitrifying functional microorganism in an aerobic fluidized bed biofilm reactor(AFBBR)were explored.The nitrogen removal process in wastewater treatment was unveiled under different aeration methods.The results indicated that with an aeration intensity of 5.77 m3/(h·m3),aeration hole spacing of 10 mm,and aeration aperture of 0.27 mm,the removal rate for ammonia nitrogen and total nitrogen was higher,which can reach 75.0％and 70.6％;The standard oxygen mass transfer efficiency(SOTE)and oxygen utilization efficiency(E)were relatively higher with an aeration intensity of 5.77 m3/(h·m3)and a pore spacing of 10 mm,and the oxygen oxygenation performance was better with smaller aeration hole sizes;Various aeration techniques impacted simultaneous nitrification and denitrifying(SND),nitrification rate(NR)and denitrifying rate(DNR),and changed the concentrations of nitrate and nitrite nitrogen;The SND,NR and DNR were the highest of 78.8％,4.9×10-4 mg/(h·mg)and 4.6×10-4 mg/(h·mg)respectively with a 10 mm spacing and 0.27 mm size of aer-ation pores.Notably,only DNR peaked at its highest value under an aeration intensity of 5.77 m3/(h·m3);A total of 16 denitrifying microorganisms were detected in the AFBBR system.And the relative abundance of denitrifying bac-teria was significantly higher than that of ammonia oxidizing bacteria and nitrite oxidizing bacteria.The suitable oxy-gen environment was obtained by appropriate aeration method,which improved the abundance of microorganisms with denitrifying function(denitrifying bacteria)in the Proteobacteria category and obtained the efficient denitri-fication of wastewater.That proper aeration intensity,spacing,and size of aeration pores are crucial for enhancing the denitrification performance of AFBBR systems.
aeration methodsaerobic fluidized bed biofilm reactor(AFBBR)wastewaterdenitrifying performancemicroorganism
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