不同相对分子质量壳聚糖絮凝性能

Study on the Flocculation Performance of Chitosan with Different Molecular Weight

壳聚糖作为天然高分子絮凝剂具有无毒、不存在2次污染、使用方便等优点;但生产和应用成本高,具有一定限制。而相对分子质量是壳聚糖的一个重要分子参数,不同相对分子质量的壳聚糖性质差异很大,研究了不同相对分子质量的壳聚糖对生活污水的絮凝性能,结果表明:高相对分子质量壳聚糖的絮凝效果较好,且随着壳聚糖用量的增加絮凝性能也随之增加,但是5×10-6后絮凝下降,其在pH值为6.5时絮凝效果最佳。

As natural macromolecular flocculants,chitosans has many merits such as no toxicity,no secondary pollution,convenient application et al.However,the production and using cost of chitosan is high.Molecular weight is an important molecular parameter of chitosan,chitosans with different molecular weight have great variant properties.The flocculation property is studied.The results indicated that： the flocculation property of chitosan of large molecular weight was better,and folcculation property increased with the dosage increasing except bigger than 5（×10^-6）,the effect reached best at pH=6.5.