关键词: 超重力, 硝基苯, 超声波, 电解, 臭氧

Abstract: High gravity technology and ozone/ultrasonic/ electrochemistry were applied jointly in the pretreatment of wastewater containing nitrobenzene. Effect of pH value, high gravity factor, liquid flow-rate and electric current density on removal rates of COD and nitrobenzene compounds were investigated. Experimental results indicated that under the conditions of high gravity factor of 100, electric current density 20 mA/cm2, liquid flow-rate 100L/h, pH value 11 and reactive time 180min, the the removal efficiency of wastewater containing nitrobenzene, COD, BOD/COD separately reach 99%, 80% and 0.64, the subsequent treatment can be reached by general biochemical processing. Compared with conventional O3 contactors, a rotating packed bed could be used to increase the efficiency of the ozone oxidative treatment of dye wastewater, due to its high mass transfer characteristics.

Key words: high gravity, nitrobenzene, ultrasonic , electrochemistry, ozone