Studies on affecting factors and mechanism of oily wastewater by wet hydrogen peroxide oxidation

Wet hydrogen peroxide oxidation of oily wastewater is performed in a batch reactor at reaction temperature between 280 °C and 320 °C, the reaction time between 30 and 90 min. Effect of reaction parameters such as reaction time, reaction temperature, H 2 O 2 excess (HE) and initial concentration of oily wastewater is investigated. The results of orthogonal test indicate that reaction temperature is the main factor and the reaction time is the secondary factor. When the reaction temperature is 300 °C, initial concentration of oily wastewater is 1160 mg/L, the reaction time is 30 min, HE is 0.75 and the COD removal of oily wastewater could reach 70%. It will not produce pollutants and it complies with the cleaner production. The preliminary study of mechanism on oily wastewater by WPO is carried out. The result indicates that oily wastewater by WPO can be explained by free radical mechanism.