摘要：A newly foldaway DO (Dissolved Oxygen)-in-creased biofilm reactor (FDI-BfR) was designed for the treatment of synthetic aquaculture wastewater. Two strategies for the start-up of the biofilm reactor were designed in order to find the best operation conditions, with (phase B) and without (phase A) inoculum of activated sludge. The differences in the organic matter removal, ammonia nitrogen removal as well as the difference in physical properties of the biofilm were analyzed. The results showed that the start-up of the FDI-BfR is faster in phase A, from the start to the end, in both strategies. The average removal rate of COD and NH4+-N were above 90% and 70% respectively in 24 hours. More compact structure and stronger adhesion were observed by scanning electron microscope (SEM) in the biofilm started-up by adding activated sludge than that of natural-started biofilm. Moreover, the V3 regions in the 16S rRNA of the bacteria were sequenced to characterize the microbial community structures in both reactors. The diversity of the microbial community is higher after start-up when applied different strategies, though the difference of the removal efficiency for the two start-up strategies is insignificant.
关键词：Biofilm reactor;Start-up;Removal efficiency;Microbial community
