Study on the oxidation of ammonium sulfite by ozone in a rotating packed bed

Abstract

The oxidation of ammonium sulfite in a rotating packed bed (RPB) by ozone produced from air was studied in this work. The effects of different operating parameters on the oxidation of ammonium sulfite and the utilization of ozone were investigated, and the oxidation efficiency of ammonium sulfite by ozone and air was compared. The reaction kinetics of ozone oxidation of ammonium sulfite in the RPB was also studied. Experimental results indicate that the oxidation percentage of ammonium sulfite increased with an increase in the liquid flow rate, liquid circulation time and reaction temperature, but decreased with an increase in the initial concentration of ammonium sulfite. The oxidation percentage of ammonium sulfite and the utilization efficiency of ozone increased from 15.7% to 29.8% and 68.6% to 100%, respectively, with an increase in the rotational speed from zero to 400 rpm, suggesting that the ozonation of ammonia sulfite was intensified significantly by an efficient absorption of ozone in the RPB. The results also demonstrate that the oxidation percentage of ammonium sulfite by ozone was much higher than that by air.