新型复合絮凝剂在城市污水处理中的应用研究

Research on the application of new compound flocculant in urban sewage treatment

为了提高城市污水的絮凝处理效率,以磁性纳米Fe_(3)O_(4)粒子、Na_(2)Si O_(3)、Al_(2)(SO_(4))_(3)·18H_(2)O和羧甲基淀粉钠为原料,制备了一种适合城市污水絮凝处理的新型复合絮凝剂FAS-1,并对其综合性能进行了评价。实验结果表明,絮凝剂FAS-1的加量越大、沉降时间越长,污水中COD和浊度的去除率就越高;而随着污水pH值的逐渐升高,COD去除率和浊度去除率均呈现出先增大后减小的趋势;实验温度对絮凝处理效果的影响相对较小;当絮凝剂FAS-1的加量为20mg·L^(-1)、污水pH值为8、实验温度为30℃、沉降时间为40min时,污水的COD去除率和浊度去除率分别可以达到98.7%和96.8%,达到了良好的絮凝处理效果。研究结果认为,新型复合絮凝剂FAS-1能够满足目标城市污水絮凝处理的需求,具有良好的推广应用前景。

In order to improve the flocculation efficiency of urban sewage,a new composite flocculant FAS-1 was prepared with magnetic nano-Fe_(3)O_(4)particles,sodium silicate,aluminum sulfate and sodium carboxymethyl starch as raw materials,and its comprehensive performance was evaluated.The experimental results showed that the higher the dosage of flocculant FAS-1 and the longer the settling time,the higher the removal rate of COD and turbidity in sewage;With the gradual increase of pH value of sewage,the removal rate of COD and turbidity showed a trend of first increasing and then decreasing;The influence of experimental temperature on flocculation treatment effect was relatively small;When the dosage of flocculant FAS-1 was 20mg·L^(-1),the pH value of sewage was 8,the experimental temperature was 30℃,and the settling time was 40min,the COD removal rate and turbidity removal rate of sewage could reach 98.7%and 96.8%respectively,achieving a good flocculation treatment effect.The research results showed that the new composite flocculant FAS-1 can meet the needs of the target urban sewage flocculation treatment,and has a good promotion and application prospect.