TREATMENT OF HIGH CONCENTRATION SULFIDE WASTEWATER BY SODIUM SULFITE OXIDATION METHOD

Treatment of high concentration sulfide wastewater by oxidation with Na₂SO₃ was investigated under the condition of atmospheric pressure and room temperature. The effects of initial pH, Na₂SO₃ dosage on the sulfide removal efficiency and production of oxidation products were studied. The crystal structure of solid phase was analyzed. At the same time, a method combining theoretical calculation of electrode potential of sulfite oxidative desulfurization and separation of target product S⁰ by reaction-centrifugation coupling was used to study the sulfide oxidation process. The results indicated that under the optimal condition of initial pH 5 and Na₂SO₃ dosage of 5 g/L, after reaction 15 min, the sulfide removal rate could reached 71.79% and the formation of sulfur could reached 603.5 mg/L. Using the method of separated target product S⁰ by reaction-centrifugation coupling under the condition of 2500 r/min rotating speed, could increase the formation of S⁰ to 819.5 mg/L. The result of X-Ray Diffraction indicated that the solid phase products of flocculation system and ordinary system were constitutionally stable annular rhombic sulfur (α-sulfur) at room temperature.