Catalytic wet oxidation of coking wastewater

Containing non-noble metals CuO,Co3O4,and La2O3 as the main activated components and TiO2-ZrO2 as the carrier,a CuO-Co3O4-La2O3/TiO2-ZrO2 compound catalyst was prepared to treat the coking waste water from a coking factory with the catalytic wet oxidation technique.After systematic investigation of the factors influencing the catalytic wet oxidation process,such as catalyst dosage,reaction temperature,reaction time and oxygen partial pressure,the optimal reaction conditions were found to be a catalyst dosage of 10 g/L,a reaction temperature of 220℃ and an oxygen partial pressure of 3.5 MPa.The removal rate reached 98.7% for COD and 97.9% for NH+4-N after two hours' reaction time under the optimal reaction conditions.The removal rate remained at about 90% and 88% for COD and NH+4-N,respectively,after 15 reactions.This showed that the compound catalyst CuO-Co3O4-La2O3/TiO2-ZrO2 has higher efficacy and stability in treating coking waste water.