基于分形维数的絮凝效果定量化试验  

Experimental Research on the Quantitative Analysis of Flocculation Efficiency Based on Fractal Dimension

作　　者：王圃[1] 池年平[1] 李江涛[2] 

机构地区：[1]重庆大学三峡库区生态环镜教育部重点实验室 [2]重庆大学土木工程学院,重庆400045

出　　处：《四川大学学报（工程科学版）》2006年第6期79-82,共4页Journal of Sichuan University (Engineering Science Edition)

基　　金：建设部科技资助项目(2001-45);重庆市科技项目(CSTC2006AB7020)

摘　　要：研究了水力条件、物理化学条件等因素对絮凝体分形维数的影响，用聚合氯化铝做絮凝试验，观察絮凝体的电镜照片并计算了絮凝体的分形维数，结果表明，当水力停留时间从低于标准停留时间的20．00％逐渐增加到超过33．30％时，絮凝体的分形维数数值从低于标准值的5．13％逐渐增加到高于标准值的16．03％；絮凝剂投加量最佳时分形维数最大，投加量不足时分形维数的数值下降了17．06％～33．15％，投加最过量时分形维数的数值下降了22．65％-35．63％；实验表明絮凝体的分形维数与絮凝条件有显著的相关性，可以作为絮凝效果定量化研究的参数。The flocculation experiment using PAC was carried out to study the impact of the physico-chemical condition of micro-organic-polluted water and hydraulic condition on fractal dimension of aggregated floc by scanning the electron microscope photos. The results showed that the fractal dimension increases from 5.13% lower than the standard to higher 16.03% when residence time from 20.00% shorter than the reference time to longer 33.30%, the fractal dimension is the biggest when the coagulant dosage is optimal, and the fractal dimension of aggregated floc decreases by 17.06% -31.5% and increases to 24.39% -28.13% when the coagulant dosage is short and excessive separately. The results showed that the fractal dimension has good response to the flocculation factor, and it can be used as a parameter of quantitative analysis of flocculation efficiency.

关 键 词：絮凝 分形维数 微污染源水 

分 类 号：X703[环境科学与工程—环境工程]