氧化-絮凝耦合处理酸性大红废水的机理研究

Study on the mechanism of coupled oxidation and flocculation treatment of acid brilliant scarlet GR

用氧化-絮凝耦合法处理酸性大红GR废水,以高锰酸钾为氧化剂、聚硅硫酸铁为絮凝剂,脱色率达到94.9%,COD去除率达到55.2%。通过用倒置式生物显微镜观察絮体,对反应机理进行推测。对高锰酸钾与酸性大红之间氧化还原反应产物和氧化-絮凝耦合处理的絮体进行紫外和红外吸收光谱扫描分析,探讨了氧化-絮凝耦合的反应历程和机理:酸性大红被高锰酸钾氧化成小分子有机物而脱色,还原产物新生态水合二氧化锰胶体吸附小分子有机物,并被聚硅硫酸铁卷裹成紧密絮体,氧化与絮凝之间产生协同作用,从而有效去除了色度和COD。

Coupled flocculation and oxidation process has been used in treating acid brilliant scarlet dye wastewater.The color and COD removal rates reached 94.9% and 55.2%,respectively,when potassium permanganate was used as oxidant and poly-silicic-ferric sulfate was used as flocculant.The reaction mechanism was primary conjectured after observing the aggregates morphology with biomicroscopy.The oxidative and reductive reaction outcome and aggregates were analyzed though UV-Vis adsorption spectrum and infrared adsorption spectrum.The results show that acid brilliant scarlet GR is oxidized into small organic molecules by potassium permanganate,then small organic molecules are adsorbed by the reduction product——newly formed hydrous manganese dioxide,which is enwrapped by poly-silicic-ferric sulfate in the next step,at last aggregates form and the color and COD are removed efficiently.Synergistic effect between oxidation and flocculation is produced in this process.