Performance of a pilot-scale anaerobic membrane bioreactor treating swine wastewater and the microbial community evolution
A pilot-scale external submerged anaerobic membrane bioreactor(AnMBR)was used to treat actual swine wastewater,and the changes in sludge mass concentration and settling performance as well as its pollutant removal effect at different hydraulic retention times(tHR)were investigated,and the changes in the community structure of bacteria and archaea were analyzed.The result showed that the mass concentration of mixed liquor suspended solids ρ(MLSS)and the mass concentration of mixed liquor volatile suspended solids ρ(MLVSS)showed a gradual increasing trend,and the ratio ofρ(MLVSS)to ρ(MLSS)kept at 0.40-0.85.When tHR was 5 d,the removal rate of total chemical ox-ygen demand reached 80％±6％,and the dissolved chemical oxygen demand accounted for 55％of the total chemical oxygen demand removal rate;the removal of NH4+-N and total phosphorus by AnMBR was not significant.Among the archaea,methanobacterium dominated in the AnMBR startup and commissioning phase,methanosarcina and methanospirillum dominated in the operation and stabiliza-tion phase,whereas the dominant species in the commissioning and operation phase mainly consisted of clostridium and pseudomonas.The total number of bacteria and the diversity of communities in the operation and stabilization phase were higher than those in the startup and commissioning phase.
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