Operation Characterictics and Microbial Community Distribution of Anammox in a Membrane Bioreactor

Abstract:

The operation characteristics and microbial community distribution of Anammox process in the MBR was studied in this manuscript.Seeding with synthetic media,we found that the granular sludge with 0.2~1 mm diameter was obtained successfully.The nitrogen-loading rate amounted to 0.245 kgTN/(m3·d),and the removal efficiency of total nitrogen,NH4+-N and NO2——N was 80%,81% and 91 %,respectively.Experiencing the hydraulic shock text,the HRT of MBR was gradually shorted from 14 to 7.9 h,the NH4+-N and NO2——N removal efficiencies were kept at about 75% and 85%,respectively.Based on terminal restriction fragment length polymorphism(T-RFLP) analysis,Microbial community diversity was achieved,and the predominant populations of Anammox bacteria found in MBR system were the planctomyce,pirellula,gemmata,pseudomonas after enrichment.The results presented here provided a theoretical basis for the change of microbial community during Anammox process.