Direct and indirect ozonation of p-toluene sulfonic acid(p-TSA)

a typical pollutant in pharmaceutical wastewater

was studied.The results showed that at the conditions of pH 2—13

ozone flow rate 16—64 mg·min-1 and pollutant concentration 100—5000 mg·L-1

the degradation followed the pseudo-first-order kinetics.The higher pH and ozone flow rate

and lower concentration were

the larger reaction constants.In order to consider the relative contribution of direct and indirect oxidation a kinetic model of ozonation was set up

in which 3 kHO2-·/k0 was selected as kinetic parameter.The effect of pH

ozone flow rate and pollutant concentration on 3 kHO2-·/k0 was analyzed quantitatively

which could provide fundamental data for the application of ozonation in pharmaceutical wastewater pollution control.