作　　者： ; ; ; ; ; ;

机构地区： 湖南大学土木工程学院建筑安全与节能教育部重点实验室

出　　处： 《给水排水》 2008年第6期23-28,共6页

摘　　要： 借助图像分析技术与分形理论,对含十二烷基硫酸钠(SDS)高岭土颗粒的动态絮凝过程、絮体分形结构的形态学特征、纳米SiO2与聚氯化铝(PAC)对剩余浊度与SDS的去除效果进行了研究分析。结果表明:①SDS存在时,高岭土颗粒表面ζ电位绝对值增加,且高岭土原始粒径略有增大;②投加PAC,剩余浊度降低明显,但SDS的表观去除率较低;③升高水温对浊度与SDS去除效果有改善;④纳米SiO2能显著提高PAC对浊度与SDS的去除效果,悬浊液中絮体粒径增大,絮团内部孔隙率较高,沉速加快,分维值下降。 The dynamic flocculation process of Kaolin particles with sodium dodecyl sulphate（ SDS） and the morphological characteristics of flocs fractal structures were investigated with the aid of image analysis technology and the fractal theory. Turbidity and SDS removal efficiency by silica nano-particles and polyaluminium chloride（PAC）were also evaluated. The results showed that. （1）When SDS presented, the absolute value of Zeta potential on the surfaces of Kaolin particles increased, and the particle size of Kaolin increased slightly. （2） Adding the PAC decreases residual turbidity and SDS markedly and slightly, respectively. （3）Increase of temperature can improve the removal efficiency of SDS. （4）The presentation of silica nano-particles dramatically enhanced the removal of turbidity and SDS with PAC as the flocculant, resulting in bigger size of flocs with increased internal porosity, settling velocity, and decreased value of fractal dimension.

关 键 词： 纳米 聚氯化铝 阴离子表面活性剂 分维 絮凝效果 形态学特性

领　　域： [化学工程] [一般工业技术]