Experimental Study on Advanced Treatment of Semi-coking Wastewater by Ozone Catalytic Oxidation

A new method of advanced treatment of semi-coking wastewater by ozone catalytic oxidation was proposed. CuO/γ-Al 2 O 3 was prepared by impregnation with copper nitrate and alumina carrier,then characterized by XRD.Using the catalyst process the semi-coking wastewater after biochemical treatment by ozone catalytic oxidation.Experimental device was designed and influencing factors for COD removal efficiency such as amount of catalyst used,reaction time,amount of ozone used,sewage pH value and other factors were investigated.Experimental results showed that pH under acidic condition is helpful to better COD removal efficiency,improving the amount of ozone can contribute COD removal efficiency,and control catalyst dosage and reaction time within a certain range conductive to the removal of contaminants.When the catalytic process condition were as amount of CuO/γ-Al 2 O 3 300 g,amount of ozone used 0.08 m 3 /h and pH in sewage 7 and the reaction time 1 h,the removal rate of COD from sewage was expected to reach 95%.The catalyst also exhibits the excellent activity and stability in 20times reaction of ozone catalytic oxidation.