The landfill leachate was treated by the combination of anaerobic fluiized bed and outside circle three-phase aerobic fluidized bed systems. The influent CODCr concentration, influent NH3-N concentration, anaerobic CODCr removal rate, anaerobic NH3-N removal rate and other factors were studied on the CODCr and NH3-N removal rate of the Landfill Leachate. The experimental results showed that the landfill leachate of low NH3-N concentration has good treatment efficiency by the joint system, when the total HRT, influent CODCr concentration, influent NH3-N concentration of the treatment systems were 10.5 h, 2817.2～4383.88 mg/L, 303.12～445.43 mg/L,respectively, the removal rates of CODCr and NH3-N were 86.79%～98.85% and 81.14%～94.01%. The Volumetric loading for CODCr and NH3-N achieved an average of 7.38 kg/(m3·d) and 0.37 kg/(m3·d). When the CODCr value of Landfill Leachate below 3400 mg/L, there were high CODCr removal rate of 86.79%～98.85%, when NH3-N concentration below 400 mg/L, the NH3-N in the system had a higher removal rate of 81.14%～94.01%. It was proved that to improve the removal rate of anaerobic CODCr and NH3-N and reduce the NH3-N concentration of anaerobic effluent, will help improve the overall CODCr and total NH3-N removal rate of the combined systems.
