Treatment of petrochemical wastewater by biofilm-activated sludge hybrid process
活性污泥与生物膜复合工艺处理石化废水的研究

Treatment of petrochemical wastewater using biofilm-activated sludge hybrid process (HP) was studied and compared with traditional activated sludge process (ASP). The results showed that HP was slightly better than ASP on the removal of COD in petrochemical wastewater.HP was obviously superior to ASP on the removal of NH3-N.The two processes had similar removal rate of S2- and oil. When the influent loads increased, HP showed stronger resistance to shock loadings. When the inflow was 2 L/h and the average concentrations of COD, NH3-N, S2- and oil in the petrochemical wastewater were 895 mg/L, 42.8 mg/L, 23.8 mg/L and 47.1 mg/L, respectively, the average concentrations of COD, NH3-N, S2- and oil in the effluent of HP were 116 mg/L, 0.82 mg/L, 0.053 mg/L and 12.1 mg/L, respectively, and the average removal efficiencies of them were 87.0%, 98.1%, 99.8% and 74.3%, respectively. Compared with ASP, HP is of higher oxygen utilization ratio, reduced sludge yield, decreased reflux quantity, lower power consumption, and easier operation.