含沙高浊水最佳絮凝条件的确定  

DETERMINATION OF OPTIMUM FLOCCULATION CONDITIONS IN HIGH TURBID WATER CONTAINING SAND

作　　者：李冬梅[1] 施周[1] 金同轨[2] 王和平[3] 梅胜[3] 

机构地区：[1]湖南大学土木工程学院,湖南长沙410082 [2]西安建筑科技大学环境与市政工程学院,陕西西安710055 [3]广东工业大学建设学院,广东广州510643

出　　处：《水处理技术》2006年第3期15-18,共4页Technology of Water Treatment

基　　金：国家自然科学基金项目(50078043)

摘　　要：在含沙量为85kg/m3的悬浊液中投加阳离子高分子聚合物,研究不同絮凝条件下絮体的自由沉速、结构密实程度、浑液面沉速与上清液余浊等的变化规律。利用“分维”作为定量控制参数研究含沙高浊水絮凝效果达最佳时的絮凝条件(如搅拌速率、搅拌时间、高分子浓度等),探讨了最佳絮凝条件下不同原始泥沙浓度对絮体分形结构的影响规律。实验得出85kg/m3泥沙絮体结构密实性达最佳时的水力剪切强度Gt值存在两个临界值:快速絮凝阶段G1t1=2350,慢速絮凝阶段G2t2=12420。Through dosing cationic polymer into turbid suspended liquor containing 85kg/m^3 of mud sad, the changing regularities of floc＇s free settling rate end structure compact degree, turbiud liquid surface settling rate, and residual turbidity of supematant under the conditions of different floccuations were studied; ＂fractal dimension D＂was used as qualitative control parament to study the flocculation conditions, such as stirring rate, stirring time, polymer concentration under which the flocculation efficiency of high turbid water containing sand is optimium; the influence of different initial concentration under the condition of optimium flocculation on floc＇s fractal structure. The experiment derived that hydraulic sheafing strength Gt value when the structure compactness of floc containing 85kg/m^3 mud sand reaching the optimium has two critical values： G1t1 in quick floceulation stage=2350,G2t2 in slow flocculation stage=12420,

关 键 词：含沙高浊水 架桥絮体 絮凝条件 分形结构 分形维数 CT值 

分 类 号：TV149[水利工程—水力学及河流动力学] TU991.22[建筑科学—市政工程]