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研究论文

徐士鸣,冷强,吴曦,徐志杰,胡军勇,吴德兵,金东旭,王平.逆电渗析反应器阴、阳极联合降解酸性橙Ⅱ实验研究[J].环境科学学报,2019,39(7):2163-2171

Experimental investigate on the joint degradation for acid Orange 7 by anode and cathode in RED reactor

摘要：通过对由溶液浓差能驱动的逆电渗析（RED）反应器阴、阳极联合降解酸性橙Ⅱ模拟废水串、并联两种流程的实验研究，结果发现：在膜电势作用下，有机废水流经RED反应器阴、阳极时会生成两种强氧化剂-次氯酸（HClO）和过氧化氢（H₂O₂），在强氧化剂的作用下废水中有机物会发生氧化降解.在通过正交实验方法获得的最佳操作条件下，对1 L浓度为150 mg·L^-1酸性橙Ⅱ模拟废水进行20 min的降解实验.3次实验结果表明，串、并联流程的酸性橙Ⅱ平均降解率分别为59.26%和87.93%，平均脱色率分别为57.08%和86.87%，均低于RED阴、阳极独立降解时的降解率和脱色率.原因在于：在联合降解条件下反应器阴、阳极之间的产物会相互干扰，使得废水中有机物降解率降低.但降解过程中循环废水的pH值可以保持稳定.

Abstract：The joint degradation of Acid Orange 7 (AO7) in simulated wastewater, in series or in parallel flow, by the cathode and anode in a reverse electrodialysis (RED) reactor had been investigated. The results show that under the membrane potential, two strong oxidants, hypochlorous acid (HClO) and hydrogen peroxide (H₂O₂), could be produced when the wastewater flowed through the two electrodes in RED reactor. Both of electrodes could oxidize and degrade organic matters in the wastewater. Under the optimum operational conditions obtained by orthogonal analysis, oxidation and degradation of AO7 at 150 mg·L^-1 were tested. The results in triplicate experiments show that average degradation rates of AO7 were 59.26% and 87.93%, and the average decolorization rates were 57.08% and 86.87% by in series or in parallel flow mode, respectively. these efficiencies are lower than those under independent degradation by the cathode or anode in RED reactor. This is owing that under the degradation by-products of two electrodes in RED reactor would interfere with each other, thus reduced the degradation rate of organics in wastewater. But, the pH of the wastewater could keep stable during the joint degradation process.

Key words：reverse electrodialysis organic wastewater oxidation reaction degradation HClO H₂O₂