Efficient oxidation of thiosulfate in solution using multistage method

The oxidation characteristics of sulfite and thiosulfate were examined by using thermodynamic calculations and simulated desulfurization solution experiments to investigate their difference. Subsequently, a new multistage oxidation method using oxygen−ammonium persulfate was presented and applied to the oxidation of a real desulfurization solution. The results show that the concentrations of thiosulfate and sulfite in the real desulfurization solution decrease from 48.76 and 61.76 g/L to 2.24 and 0.02 g/L, respectively, and the ammonium sulfate products obtained are white with uniform particles. In addition, compared with ammonium persulfate alone, the multistage oxidation method can reduce the ammonium persulfate addition by 37.56% and treatment cost by 28.13%.