Gas-liquid mass transfer was studied during forced sulfite oxidation in the presence of active carbon particles in a stirred tank.The influence of temperatures from 30℃ to 50℃

solid loading of fine particles from 0 to 1.0 kg·m-3

stirring speeds from 50 to 400 r·min-1

and particle sizes on average O2 gas absorption rate were studied.Experimental results show that active carbon particles could improve gas-liquid mass transfer remarkably.At 30℃

with the increase of solid loading of micro-particles

the oxygen absorption enhancement factor increases to a maximum value at the solid loading of 0.6 kg·m-3

and then decreases due to the increase of gas-liquid mass transfer resistance.For active carbon particles

the mass enhancement factor is much higher with ultrasonic processing for particle size of 1 μm.The oxygen absorption rate and absorption enhancement factor increase with the increase of stirring speed due to the acceleration of surface renewal frequency.The enhancement factor decreases as temperature increases while absorption rate increases.The result indicates that the effect of temperature on the mass transfer enhancement is stronger than the effect of fine particles.