Reaction Mechanism and Experiment Research of Explosive Wastewater by Supercritical Water Oxidation

摘要

Many toxic and undegradation organic pollutants to people health are existed in explosive wastewater. The conventional treatments are unable to effectively remove them. This paper treated the explosive wastewater of TNT by using a self-made discontinuity reactor, Supercritical Water Oxidation (SCWO) system. Under supercritical water condition, the oxidation degradation and the mechanism of explosive wastewater was investigated. The experimental results show that SCWO is a high-efficiency, clean treatment and disposal technique for TNT explosive wastewater. Temperature and oxygen excess serve as the main influence factors in removing COD of wastewater, with which add, the COD removal rate obviously increases. Under no oxygen condition, partially oxidation existed in SCWO.This shows that supercritical water is a well solvent and has oxidation .At 550℃, 24MPa, 120s and at oxygen excess 300%, the COD removal rate of wastewater is over 99.98 % and its main toxic pollutants TNT are thoroughly disposed. The discharge standard of environmental protection is met.