Treating DNT wastewater with wet air oxidation can reduce its COD and improve biodegradability. By adjusting temperature, pressure, and time, the BOD/COD ratio can be increased to 0.309, making the effluent more biodegradable. The COD can be lowered to 88mg/L under specific conditions. Adding nantokite and ferric salt can further decrease the COD. GC-MS analysis shows denitration, demethylation, and ring cleavage reactions occur during treatment.