壳聚糖控制聚合氯化铝混凝残余铝的实验研究

为有效控制聚合氯化铝混凝残余铝对饮用水水质的影响,通过静态实验研究了壳聚糖对铝离子的吸附性能。针对磨盘山水库的低温低浊水,探讨了壳聚糖对聚合氯化铝混凝残余铝的去除作用,并与粉末活性炭的去除效果进行了比较。结果表明,壳聚糖对水中的铝离子具有较强吸附性能,符合Freundlich等温吸附模型;在聚合氯化铝混凝过程中投加0.2~0.4 mg/L壳聚糖能够有效降低残余铝,而达到相同效果时粉末活性炭的投加量为10~30 mg/L。

Experimental study on the control of residual aluminum in polymeric aluminum chloride coagulation with chitosan

In order to effectively control the effect of residual aluminum in polymeric aluminum chloride coagulation on the water quality of drinking water,the adsorptive capacity of chitosan for aluminum ions has been studied by static tests.Aiming at the raw water with low temperature and low turbidity in Mopanshan Reservoir,Harbin,the removing effect of chitosan on residual aluminum in polymeric aluminum chloride coagulation is discussed and the removing effect of powdered activated carbon on residual aluminum is compared.The experimental results indicate that chitosan has a strong adsorption effect on aluminum ions in water,and the adsorption process is in accordance with Freundlich isotherm.Besides,the amount of residual aluminum can be reduced effectively when 0.2-0.4 mg/L of chitosan is added in the process of polymeric aluminum chloride coagulation,reaching the same result as adding 10-30 mg/L of powdered activated carbon.