In view of the poor and unstable operation effect of wastewater biochemical treatment process in papermaking industry,the pilot equipment of AO-MBBR-MBR process was used to treat papermaking wastewater,and the sludge volume change,CODCr and TN removal effect in the process of wastewater treatment by pilot equipment were studied.The results showed that MBBR fillings provided a good gathering place for microorganisms,which was conducive to the formation of larger bacterial colonies and increased the sludge concentration in the aerobic zone.After a stable operation,the removal rates of CODCr and TN were both above 90％,and the effluent CODCr and TN met the Ⅳ standard of the Surface Water Quality Standard(GB3838-2002).
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