Supercritical　water　oxidation　(SCWO)　of　dyeing　sludge　has　been　conducted　in　a　batch　reactor,　and　experiments　were　investigated　at　reaction　temperature　of　520∼600　°C,　oxidation　coefficient　of　1∼1.2,　residence　time　of　120∼600　s　and　a　fixed　pressure　of　25　MPa.　Experimental　results　indicated　that　most　of　the　organic　matters　were　degraded　at　600　°C,　25　MPa,　oxidation　coefficient　of　1.2　within　residence　time　of　600　s,　which　reached　up　to　99.80%　of　COD　removal　efficiency.　Reaction　temperature,　oxidation　coefficient　and　residence　time　all　play　significant　influences　on　the　removal　of　organic　matters,　and　the　reaction　temperature　is　the　most　influential　factor　while　oxidation　coefficient　and　residence　time　become　less　significant　as　they　exceed　fixed　values.　Moreover,　the　effects　of　different　catalysts　on　the　degradation　of　organic　matters　were　further　studied　to　enhance　the　removal　efficiency　of　COD　and　NH3-N.　It　is　suggested　that　all　the　tested　catalysts　(MnO2,　CeO2,　Al2O3,　ZrO2)　could　degrade　COD　and　NH3-N　to　a　certain　extent,　but　CeO2　has　the　highest　activity　compared　with　other　catalysts.　©　Published　under　licence　by　IOP　Publishing　Ltd.