有机无机复合型混凝剂在印染废水中的应用

摘要

A new inorganic-organic composite flocculant compounded with chitosan/bauxite was prepared by the simple acid soluble coating method and applied to the dye wastewater treatment. The structure analysis of the complex using SEM and IR indicated that chitosan mainly loaded on the bauxite by simple physical adsorption, but it might be also loaded through chemical absorption with bauxite's aluminum frame. The dosage of flocculant and wastewater pH value were the main factors influencing the results of the wastewater treatment. When flocculant dosage was 3 g/L and pH was 5 , the removal rate of COD and color were above 58% and 87% , respectively, while the removal rate of COD and color of effluent water after A/0 process were above 46% and 83% , respectively.%采用简单的酸溶包覆方法制备了壳聚糖/铝矾土有机无机复合型混凝剂,用于印染废水的处理.通过SEM观察和IR对复合物的结构分析表明,壳聚糖虽然主要以简单的物理吸附方式负载在铝矾土上,但也可能存在壳聚糖与铝矾土中的骨架铝发生化学吸附作用而负载.处理印染废水试验结果表明,混凝剂质量浓度和废水pH值是影响废水处理效果的主要因素.在质量浓度为3 g/L,废水pH =5的条件下,对印染废水COD去除率和色度去除率分别可以达到58％和87％以上；对经A/O工艺处理后沉淀池出水的COD去除率和色度去除率也可达到46％和83％以上.