摘要
在含表面活性剂十二烷基硫酸钠(SDS)的低浊(6NTU)高岭土原水中,投加纳米SiO2进行动态混凝与静沉试验,借助图像分析技术与定量控制参数,探讨了纳米SiO2的作用效果与形态学特性。结果表明:絮体的形成与生长具有分形特征,分形结构是影响颗粒混凝、絮团密实度与沉降特性的主要因素;SDS的存在对絮凝初期絮体的形成起阻碍作用,随后SDS与混凝剂的混合体共同对粒子作用,促进絮凝,絮体变大且密实,沉降性能改善;SDS和SiO2对高岭土粒子存在竞争吸附;单独投加纳米SiO2时形成的絮体小而脆弱,而以纳米SiO2为助凝剂能促使PAC絮体结构向更密实的构型转变,对浊度和SDS的去除率提高。
By adding SiO2 nano-particles into kaolin suspensions with turbidity of 6 NTU in the presence of anionic surfactant—sodium dodecyl sulphate (SDS),dynamic coagulation experiments and quiescent settling experiments were done. The action efficiency and morphologic properties of SiO2 nano-particles were discussed using image analysis technology and a quantitative factor—fractal dimension. The formation and growth of flocs have fractal properties. The fractal structure formation is a main effect factor of partic...
出处
《中国给水排水》
CAS
CSCD
北大核心
2009年第23期95-98,共4页
China Water & Wastewater
