This　study　investigated　the　effect　of　oxygen　supply　on　nitrogen　removal　performance,　by　applying　different　oxygen　supplies　to　four　SBRs　during　aeration.　That　resulted　in　four　different　volumetric　oxygen　transfer　coefficients　(K(L)a),　which　were　3.64h(-1),　10.56h(-1),　16.82h(-1),　28.17h(-1).　The　research　showed　that　the　overall　specific　nitrogen　removal　load　increased　from　0.64　to　3.03　mmoIN　CmoIX(-1)　h(-1),　with　the　increased　oxygen　supply.　Total　nitrogen　removal　reaching　above　97%,　even　with　K(L)a　of　10.56　h(-1).　When　oxygen　supply　increased　(K(L)a　increased　from　3.64　to　16.82h(-1)),　the　percent　of　SND　decreased,　while　the　rate　of　SND　increased.　However,　they　both　decreased　when　oxygen　supply　continued　to　increase　(K(L)a　increased　to　28.17h(-1)).　Besides,　stronger　oxygen　supply　in　aeration　preserved　more　PHB　at　the　start　of　anoxic　stage,　which　facilitated　endogenous　denitritation　rate　from　0.58　to　3.68　mmoIN　CmoIX(-1)　h(-1).　In　summary,　stronger　oxygen　supply　benefits　nitrogen　removal　performance.　(C)　2015　Published　by　Elsevier　B.V.