Advanced Treatment Of Petrochemical Wastewater By Catalytic Oxidation Coupled With Ceramic Membrane

Ozone catalytic oxidation has a good removal effect on refractory organic pollutants in petrochemical wastewater,but the traditional ozonation processes have defects such as poor ozone mass transfer and low ozone utilization rate.Ozone microbubble technology was used for ozone mass transfer,small particle activated carbon was used as catalyst,and ceramic membrane technology was used to recover small particle activated carbon.Finally,the catalytic oxidation coupling ceramic membrane reaction system was constructed to treat phenol simulated organic wastewater.The average particle size of ozone microbubbles was 20.37 μm,and the ozone utilization rate reaches more than99.19%.The mass transfer coefficient and decomposition coefficient of microbubbles are2.03 and 2.83 times of those of traditional aeration heads.The high interfacial pressure on the surface of ozone microbubbles is one of the reasons for its high mass transfer efficiency.Reducing the particle size of activated carbon can effectively improve the oxidation and adsorption rate.When the particle size of activated carbon decreases from1700 μm to 150 μm,the surface structure of activated carbon changes,resulting in a significant increase in the adsorption rate and ozonation rate.Reducing the particle size of activated carbon promotes the mass transfer and decomposition of ozone,and the decomposition of ozone is related to the catalytic oxidation process.The ceramic membrane can effectively recover activated carbon.When the operating pressure is 0.06 MPa,the irreversible pollution can be reduced as much as possible under the maximum membrane flux.The blockage of filter cake is the main reason for the decrease of membrane flux.The stirring at the speed of 1500 r/min can effectively alleviate the membrane pollution.The efficient treatment reaction system for petrochemical wastewater based on the above studies can efficiently treat organic pollutants in wastewater in a short period of time.The larger the dosage of activated carbon is,the more obvious the removal effect is and the lower the membrane flux is.The dosage of activated carbon should be minimized to maintain the membrane flux while ensuring the removal efficiency of pollutants.