Decomposition of TBP Waste under Controlled Hydrothermal Conditions with O2 Gas.

Decomposition processes of TBP waste under alkaline hydrothermal conditions at 150-350°C, in NaOH solution of 0-1 M with 02 pressure of 0-4 MPa were investigated. Almost all TBP decomposed at above 200°C under any O2 gas pressure. Orthophosphoric acid was rapidly formed above 250°C with the increase of O2 gas pressure. COD removed ratio exhibited a minimum at 250°C with the formation of water soluble organic materials. Adequate conditions of TBP decomposition for solvent disposal were as follows; TBP/dodecane (30: 70) O.1 cm3, O2 gas pressure 4 MPa, NaOH concentration 0.5 M (5cm3), reaction temperature 300°C.