Study on the Effect of MABR-AO Coupling Process on the Treatment of Low C/N Township Domestic Sewage
In order to solve the problems of insufficient carbon source,limited kinetic energy of nitrification-denitrification process and high difficulty of denitrification from low carbon-to-nitrogen(C/N)ratios in domestic sewage from villages and towns,the coupling process system of membrane aeration bioreactor(MABR)and traditional AO process was designed and established in this study.This system was utilized to initiate biofilm formation under the inlet conditions typical of villages and towns,treat sewage with low C/N ratios(COD/TN ratios of 4,3,2,1 and 0.5),and analyze the biodiversity of the activated sludge from both processes.The results indicate that the MABR biofilm formation cycle lasts approximately 30 days,during which the system achieves a relatively stable pollutant removal efficiency.Compared to the AO process,the MABR-AO coupled process exhibits superior nitrogen removal capacity under low C/N ratio conditions,with an average total nitrogen(TN)removal rate improved by 17.9%.Furthermore,the MABR biofilm demonstrates a higher abundance of operational taxonomic units(OUTs)and a greater proportion of denitrifying microorganisms compared to the AO process activated sludge,accounting for its stronger denitrification capacity.This process is straightforward to operate and maintain,and demonstrates robust total nitrogen removal capacity under low C/N ratio conditions.
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