逆电渗析反应器降解模拟甲基橙染料废水实验

利用逆电渗析（RED）技术可实现"废热治理废水"的目的.为探究RED反应器对染料废水的降解效果,构建了由40对膜构成的RED反应器.以NaCl水溶液作为工作溶液,甲基橙模拟废水作为降解对象,考察了废水流率、Cl^-浓度、Fe²⁺浓度、pH值、曝气流率和输出电流对模拟废水脱色率及COD去除率的影响.结果表明,对于RED反应器阳极回路印染废水,废水流率对其脱色率影响不大,但Cl^-浓度对其脱色率和COD去除率影响较大.对于RED反应器阴极回路印染废水,废水流率、Fe²⁺浓度、pH值和曝气流率均对其脱色率和COD去除率产生影响.当阳极回路废水氯盐浓度为0.5 mol·L^-1,阴极回路废水pH=2、Fe²⁺浓度为0.1 mmol·L^-1、曝气流率为600 mL·min^-1,两回路模拟废水流率均为82 mL·min^-1实验条件下,输出电流为0.25 A时,处理20 min后,阳/阴极回路模拟废水脱色率分别为99.9%和91.71%;处理80 min后,阳/阴极回路模拟废水COD去除率分别可达到52%和62%.

Degradation of methyl orange dye wastewater by a reverse electrodialysis reactor

The reverse electrodialysis (RED) technology can be used to achieve the purpose of "waste heat treating waste water". A RED reactor with 40 membrane pairs was established to explore the degradation of dye in a methyl orange synthetic wastewater. The influences of the flow rate, Cl^- and Fe²⁺ concentrations, pH value, aeration rate, and output current on the decolorization and COD removal efficiencies of the synthetic wastewater were investigated. The results showed that in the anodic loop of the RED reactor, flow rate has little effect on the decolorization efficiency for the wastewater, and Cl^- concentration has significant effect on the decolorization and COD removal efficiencies. in the cathodic loop of the RED reactor, the flow rate, Fe²⁺ concentration, pH value and aeration rate influenced on the decolorization and COD removal efficiencies. Under the conditions that Cl^- concentration was 0.5 mol·L^-1 in the anodic loop with pH=2, Fe²⁺ concentration and aeration rate were 0.1 mmol·L^-1 and 600 mL·min^-1 respectively in the cathodic loop, the wastewater flow rate was 82 mL·min^-1 in both two loops, and the current was 0.25 A, the decolorization efficiency of the wastewater in the anodic and cathodic loop could reach 99.9% and 91.71% respectively in 20 min. Furthermore, after 80 min, the COD removal efficiency in the anodic and the cathodic loop could reach 52% and 62%, respectively.