Research on the Treatment of Highly Concentrated Phenolic Wastewater

采用fEnTOn系列方法处理高浓度酚醛废水,考察了各方法对化学需氧量(COd)去除率的影响.首先,确定了fEnTOn-uV氧化中H2O2溶液添加量、fE2+与H2O2摩尔比、PH值、光照时间等因素的较优水平;同时结果表明,将fEnTOn氧化法与超声和紫外光照射联用显著改善了处理效果,COd去除率可以达到90%以上;将絮凝法与fEnTOn-uV联用,聚丙烯酰胺加速絮状物沉淀,COd去除率达到70%左右;用红外和核磁手段表征酚醛废水经fEnTOn-uV氧化后的产物,证明fEnTOn-uV氧化法通过苯环侧链氧化断裂的主要途径进行.Several Fenton-related experiments were used to treat highly concentrated phenolic wastewater.Firstly,the optimal level of each factor in the Fenton-ultraviolet light experiment,such as the amount of H2O2,the mole ratio of Fe2+to H2O2,pH value and UV exposure time,was determined.The treatment effect obviously got improved when Fenton treatment was combined with ultrasonication and ultraviolet light irradiation,in which the removal efficiency of chemical oxygen demand(COD)could reach more than90%.In treating the phenolic wastewater by both flocculation and Fenton-UV,polyacrylamide could accelerate the sedimentary rate of the floccules and the COD removal efficiency was around 70%.Characterization of the flocculate emerging in the Fenton-UV oxidation using FT-IR and 1H-NMR methods proved that oxidation and degradation of the benzene ring′s side chains were the main way of Fenton-UV treatment