复合铝混凝剂CPAC强化混凝去除藻类试验研究

以三氯化铝和有机高分子PGA为原料,制备了复合混凝剂CPAC,并探讨了该种混凝剂对含藻水的强化混凝去除作用.结果表明:复合混凝剂混凝效果优于单独的无机混凝剂PAC,当混凝剂投加量(以Al质量计)为4.5 mg/L时,PAC的浊度去除率为84.3%,而CPAC的浊度去除率达到93.1%;CPAC对高浊度原水的去除效果好于低浊度原水,当原水浓度从30 NTU提高到1 000 NTU时,混凝剂投加量为4.5 mg/L,其浊度去除率相应的由81%提高到98.2%;混凝剂最挂投加量约为4.5 mg/L,在此浓度下,浊度和叶绿素a 的去除率达到最高,分别为93.1%和82.5%;pH在5.0～9.0范围内,混凝效果均比较稳定.

Experimental Research of Removing Algae by Enhanced Coagulation with Composite Polymeric Aluminum Chloride

Composite polymeric aluminum chloride (CPAC) was prepared by using polymeric aluminum chloride (PAC) and cationic polymer flocculant PGA.The enhanced coagulation with CPAC was carried out in micro- polluted reservoir water.The experiment results show that CPAC is better than PAC in treating wastewater.When Al dosage is 4.5 mg/L,the turbidity removal rate of PAC is 84.3% and 93.1% of CPAC;When the turbidity asscends from 30 to 1000,the removal rate ascends from 81% to 98.2% at the condition of 4.5 mg/L Al dosage.The optimum Al dosage is 4.5 mg/L according to the quality of raw water,and the removal rate of the turbidity and chlorophyll a is 93.1% and 82.5%.The optimum pH of CPAC ranges from 5.0 to 9.0,so it does not need to adjust the pH of the raw water in experiment.