The mature landfill leachate from sanitary landfill is difficult to treat because of complicated composition, high concentration of ammonia and low C/N. During this study, a CANON(completely autotrophic nitrogen removal over nitrite) process with an intermittent aeration/anaerobic mixing operational mode was applied to remove nitrogen from mature landfill leachate. After domestication of 130 d, the system was stable with the effluent COD, NH~+_4-N and TN(mg·L~(-1)) of 407±14, 8±4 and 19±4 when the influent ...