Abstract:

Cationic 2-hydroxypropyltrimethylammonium chloride chitosan（HTCC） has been prepared by orthogonal experiment. The removal rate of turbidity by composite flocculant HTCC/PAC is investigated，and its best composited ratio is determined to be m（HTCC）∶m（PAC）=1∶1.6. The turbidity removal rate reaches above 96% and residual turbidity reaches under 4 NTU by HTCC/PAC with this composite ratio and optimum dosages. The experiment shows that pH has great influence on the turbidity removal effectiveness of HTCC/PAC，but the influence of settling time on turbidity removal is not obvious. The residual aluminum of the water samples treated by HTCC/PAC is obviously lower than the aluminum permissible content of Standards for Drinking Water Quality. The flocculation effectiveness of HTCC/PAC on the water samples from Lanzhou section of Yellow River is quite good,and its residual turbidity is less than 3 NTU when the dosage of HTCC/PAC is optimum.

Key words: quaternized chitosan, polymeric aluminum chloride, composite, flocculation, residual aluminum

摘要：

通过正交试验制备了阳离子絮凝剂壳聚糖季铵盐（HTCC），研究了HTCC 与PAC 复配的除浊效果，确定最佳复配比为m（HTCC）∶m（PAC） =1∶1.6，在该复配比及最佳投加量下，浊度去除率达96% 以上，余浊<4 NTU。实验表明：pH 对HTCC/PAC 的除浊效果影响较大；沉降时间对除浊效果无明显影响； HTCC/PAC 处理后水样中的Al³⁺残余量明显低于国家生活饮用水卫生标准中的允许含量；HTCC/PAC 对黄河兰州段水样的絮凝效果良好，最佳投加量下出水余浊＜3 NTU。

关键词: 壳聚糖季铵盐, 聚合氯化铝, 复配, 絮凝, 余铝

CLC Number: 

• X703