生物絮凝剂的絮凝形态及影响因素  

Flocculation Morphology of Bioflocculant and Its Influence Factors

作　　者：杨莹[1] 马放[2] 李芬[1] 颜婉茹[1] 

机构地区：[1]哈尔滨理工大学,哈尔滨150040 [2]哈尔滨工业大学

出　　处：《东北林业大学学报》2009年第12期91-94,共4页Journal of Northeast Forestry University

基　　金：哈尔滨理工大学青年科学研究基金项目(2008XQJZ038);哈尔滨理工大学教学研究课题项目(B200800040)

摘　　要：系统地对复合型生物絮凝剂(CBF)的絮凝形态进行了分析及相关研究。对比了投加CBF与未投加CBF对实验系统中胶体颗粒的絮体形态、Zeta电位的改变。同时研究了钙离子以及投加顺序在絮凝过程中所发挥的作用。结果表明,CBF具有良好的絮凝效果;一定浓度的钙离子能降低颗粒的表面电荷,促进CBF分子与胶体颗粒之间的键合,有利于絮凝沉淀;投加方式的改变影响了悬浊液体系的pH值,从而影响了其中各种物质的表面电荷,限制了CBF作用的发挥。正确的投加方式才能产生良好的絮凝效果。Systematic analysis and relevant research on flocculation morphology of compound bioflocculant （CBF） were conducted. The changes of floc morphology and Zeta potential of flocs in the presence of CBF were compared with those in the absence of CBF. Moreover, the efficiency of Ca^2＋ and the dosing method were studied through microscopic observation on flocs formed in various flocculation courses of CBF. Result shows that CBF is an effective flocculants. A definite concentration of Ca^2＋ could decrease the interface charge of particles and increase the bond of flocculant molecules and particles, which help to accelerate flocculation and settling. The change of dosing method for agents has an effect on pH of the suspension, which influences the interface charge of various substances in the water and restricts the efficiency of CBF. Proper dosing method could improve flocculation performance.

关 键 词：生物絮凝剂 絮凝形态 ZETA电位 钙离子 投加方式 

分 类 号：X703.5[环境科学与工程—环境工程]