铝盐-淀粉复合絮凝剂污水处理效果研究

以模拟废水、生活污水、市政污水和制浆造纸废水为实验对象，检验了一种新合成铝盐一淀粉复合絮凝剂中试产品(CAS)的污水处理效果．结果表明，与聚合氯化铝(PAC)相比较，CAS处理不同浓度(100、400和2000mg·L^-1)高岭土模拟废水时最佳投加量分别为3．0、2．0和2．0mg·L^-1，为PAC最佳投加量的60％、50％和50％；同时CAS对该废水、生活污水、市政污水的浊度去除效果略优于PAC，但COD去除率明显高于相同剂量的PAC；处理高浓度制浆造纸污水时，CAS投加量相当于PAC用量的70％。COD处理率提高10％，污泥量减少40％.

Wastewater treatment efficiency of combined aluminum-starch flocculant

This paper examined the efficiency of a combined flocculants synthesized by aluminum and starch (noted as CAS) in treating kaolin suspension, domestic wastewater, municipal effluent and pulp-making wastewater. Jar test results showed that the flocculent performance of CAS was prior to polyaluminum-chloride (PAC) in treating different concentration kaolin suspension samples (100, 400 and 2000 mg x L(-1)). The optimal dose of CAS to each sample was 3.0, 2.0 and 2.0 mg x L(-1), being 60%, 50% and 50% of PAC, respectively. CAS also showed a priority to PAC in removing the COD and turbidity of domestic and municipal effluents. When treating pulp-making wastewater, the optimal dose of CAS was 70% of PAC. The removal rate of COD was enhanced 10%, the sludge was reduced 40%, and the sediment time was greatly shortened. It was also identified that the optimal concentration required to affect flocculation depended on the concentration and the character of the wastewater within the range examined. CAS was more effective in treating high turbidity wastewater.