基于分形维数的絮凝效果定量化试验

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％，投加量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。

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

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.