A combined system consisting of hydrolysis acidification,denitrification and nitrification reactors was used to remove carbon and nitrogen from the nylon-6 production wastewater,which was characterized by good biodegradability and high nitrogen concentration.The influences of Chemical Oxygen Demand(COD)in the influent,recirculation ratio,Hydraulic Residence Time(HRT)and Dissolved Oxygen(DO)concentration on the system performances were investigated.From results it could be seen that good performances have been achieved during the overall experiments periods,and COD,Total Nitrogen(TN),NH+4-N and Suspended Solids(SS)in the effluent were 53,16,2 and 24mg·L-1,respectively,which has satisfied the first standard of wastewater discharge established by Environmental Protection Agency(EPA)of China.Furthermore,results showed that operation factors,viz.COD in the influent,recirculation ratio,HRT and DO concentration,all had important influences on the system performances.
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