Based on the operation situation of a wastewater treatment plant of Hebei province, the performance of modified Bardenpho process for treatment of municipal wastewater was studied. The results show that the removal efficiencies of chemical oxygen demand (COD) and ammonia nitrogen (NH4+-N) are good；the removal rates of COD and NH4+-N were respectively 92.4% and 94.0%;the effluent total phosphorus (TP) didn’t meet the criteria of the first grade A,and must be accompanied by chemical phosphorus removal;nitrate nitrogen, dissolved oxygen, pH, temperature and other factors didn’t cause obvious adverse effects of TP removal. During the period of monitoring,through microscopy analysis for the dynamic changes of filamentous bacteria in activated sludge, good performance and stability of microbial ecosystem can guarantee the removal effect. The conclusions can provide reference for similar wastewater treatment plants.
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