Characteristic analysis of treatment of oily sludge by supercritical water oxidation

Along with the increasing demand of crude oil in China, oily sludge as an additional product in the process of crude oil also keeps growing. Supercritical water oxidation technology as a promising terminal technology for organic waste treatment is widely concerned by scholars at home and abroad. The treatment of oily sludge by supercritical water oxidation technology can realize the complete reduction and harmlessness of oily sludge, and the recovery of heat released during the oxidation process can realize the resource utilization of oily sludge. A small high temperature and high pressure reactor was used to study the degradation of oily sludge under different process parameters, and the three phase products were detected and analyzed. Based on this, the kinetic analysis of supercritical water oxidation of oily sludge was investigated under different reaction temperatures and reaction times. The results show that COD removal rate reaches 99. 41% when the reaction temperature is 640 °C, and the effluent COD is 465 mg/L. The kinetic parameters in the supercritical water oxidation reaction are as follows: the activation energy is 43. 83 kJ/mol, and the finger-forward factor is 1 136.12 s^-1. The results show that supercritical water oxidation technology can realize the harmless treatment of oily sludge.