Role of New Type Floating Island in Improving Effluent Quality and the Characterization of Microbe on Biofilm Carrier

A new type of integrated ecological floating island(IEFI) was designed and applied.This study firstly assessed the role of microbe on biofilm carrier.The results showed that the average COD,TN and TP removal efficiencies of IEFI were much higher than those of conventional floating island(CFI),and that the statistical differences were observed in different pollution category(p0.05).Influent monthly concentrations of COD,TN and TP of IEFI were lower than those of CFI.The highest removal efficiency was present in September,May and November,respectively.Constructing clone library was used to analyze the microbe on biofilm carrier.The results,which were different with microbial group on other biofilms,indicated that clones affiliated Proteobacteria dominated more than 67% of the total clones,following by Bacteroidetes.Within the Proteobacteria,Beta-Proteobacteria group was the most abundant,following by Alpha-Proteobacteria and Delta-Proteobacteria groups.For Alpha-Proteobacteria,more than 60% of the phylum was related to Rhodobacter.The Beta-Proteobacteria clones were mostly related to Burkholderiale.Flavobacteria dominated 75% of Bacteroidetes group.Functions of Acidobacteria,Delta-Proteobacteria,and Actinobacteria are still unknown and need to be further studied.In addition,Bacillariophyta group were also detected in biofilm carriers.