【摘要】 采用电解还原方法模拟工业含铬废水的处理。试验以普通铁极板作阴阳极,在直流电的作用下,铁阳极溶解生成的Fe2+和硫酸亚铁中的Fe2+把废水中的六价铬离子还原成三价铬离子;随着氢离子阴极放电使废水pH值逐渐升高,Cr3+和Fe3+便形成氢氧化铬及氢氧化铁沉淀,同时氢氧化铁有凝聚作用,能促进氢氧化铬的迅速沉淀。在实验最佳条件下,废水初始含铬浓度在600mg/L及600mg/L以下、反应pH=3、加入FeSO4的量1.20g(Fe2+与Cr2O72+比例1∶1)、反应时间40min、换极周期10min、电流密度0.085A/cm2,出水浓度达到0.57mg/L,去除率为94%。出水浓度达到国家排放标准。更多还原

【Abstract】 The article introduces the method of simulating electro-deoxidization to treat the industrial wastewater which contained Cr6+. We used common ferreous electrode as cathode and anode. By the process of DC, the ferreous anode dissolved and created Fe2+, and the ferrous sulfate in the liquid deoxidizes the Cr6+ to Cr3+; pH increased along with discharge of H+ at cathode . So the Cr3+ and Fe3+ come into chromic hydroxide and ferreous hydroxide, respectively. Simultaneity, the ferreous hydroxide which accelerates the chromium hydroxide to make deposition can be used as coagulation. Under the best experimental condition, the initial concentration of hoxavalent chromium is 600 mg/L or 600 mg/L hereinafter, pH=3, the quantity of FeSO4 is 1.20 g (Fe2+:Cr2O72+=1:1), reactive time is 40 min, exchange electrode cycle is 10min, electrical current consistency is 0.085 A/cm2, as a result effluent’s concentration is 0.57 mg/L, and removal rate is 94%. Effluent’s concentration achieves the national standard.更多还原