Na2SO3氧化处理高浓度含硫废水的过程探讨

TREATMENT OF HIGH CONCENTRATION SULFIDE WASTEWATER BY SODIUM SULFITE OXIDATION METHOD

采用Na2SO3氧化法在常温常压下对实验室模拟的高浓度含硫废水进行处理,考察了初始p H和氧化剂投加量对硫化物去除效果及氧化产物产量的影响,并对固相产物的晶体结构进行分析;同时结合Na2SO3氧化脱硫电极电动势的理论计算,采用反应-离心分离耦合的方法及时分离目标产物单质硫S^0的方式研究了Na2SO3氧化硫化物的反应历程。实验结果表明:在初始p H值为5,氧化剂投加量为5 g/L,反应时间为15 min的条件下,硫化物去除率为71.79%,S^0产量为603.5 mg/L;采用反应-离心分离耦合的方法及时分离S^0,在转速为2500 r/min时,S^0产量可提高到819.5 mg/L;X射线衍射(XRD)分析表明,普通反应体系和离心反应强化体系中固相产物均主要为环状斜方硫(α-硫)。

Treatment of high concentration sulfide wastewater by oxidation with Na2 SO3 was investigated under the condition of atmospheric pressure and room temperature.The effects of initial pH,Na2 SO3 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 S^0 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 Na2 SO3 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 S^0 by reactioncentrifugation coupling under the condition of 2500 r/min rotating speed,could increase the formation of S^0 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.