In　order　to　achieve　advanced　nitrogen　removal　from　landfill　leachate　without　the　addition　of　external　carbon　sources,　a　novel　system　coupling　an　anaerobic　sequencing　batch　reactor　(ASBR)　and　sequencing　batch　reactor　(SBR)　was　proposed　for　the　treatment　of　real　landfill　leachate　with　NH4+-N　and　chemical　oxygen　demand　(COD)　concentrations　of　1100　mg/L　and　6000　mg/L,　respectively.　ASBR　could　remove　80%　of　the　influent　COD　under　a　volumetric　loading　rate　of　5　kg　COD/(m(3)　d).　Denitritation　and　simultaneous　nitritation-denitritation　were　responsible　for　50%　of　the　TN　removal　in　SBR　under　alternate　anoxic/aerobic　modes.　Furthermore,　advanced　nitrogen　removal　was　realized　with　a　total　inorganic　nitrogen　(TIN)　removal　efficiency　of　99%　at　the　expense　of　endogenous　denitritation　during　a　26　h　period,　which　led　to　effluent　COD　and　TN　values　of　550-650　mg/L　and　15-25　mgN/L,　respectively.　For　the　combined　system,　removal　efficiencies　of　COD　and　total　nitrogen　(TN)　were　above　90%　and　95%,　respectively.　(C)　2013　Elsevier　Ltd.　All　rights　reserved.