复合型生物絮凝剂成分分析及其絮凝机理的研究

Flocculating mechanism and ingredient analysis of compound bioflocculant

蒽酮反应、考马斯亮蓝、紫外扫描等测定结果表明,絮凝剂CBF的主要成分为多糖类物质.红外光谱扫描分析CBF中含有羧基,分别以-COO-和COOH的形式存在.用凝胶色谱柱测其相对分子量为105～106.Zeta(ξ)电位测定及氢键和离子键检验结果表明,CBF与高岭土等无机颗粒之间的作用力为离子键,絮凝过程中存在架桥作用.利用原子力显微镜观察其絮凝形态发现絮体结构密实,有利于絮体沉降.其絮凝机理为絮凝剂和高岭土以离子键的形式结合,之后通过架桥作用絮凝沉淀.

Compound bioflocculant（CBF） is mainly composed of polysaccharide, which is determined by Anthrone reaction, Coomassie blue reaction and ultraviolet spectroscope method. CBF contains carboxyl, which is determined by Infrared spectra. Distributing of molecular weight of purified CBF is from 10^5 to 10^6 , which is determined by gelatin chromatogram. The acting force between CBF and the inorganic including kaolin is electrovalent bond, which is determined by Zeta（ζ） electric potential, hydrogen bond and electrovalent bond test. And bridge occur during flocculation process. Floc structure is dense and beneficial to flocculating. The results showed that the flocculating mechanism of CBF resulted from the combination of kaolin suspending solution with CBF by electrovalent bond.