| 腐殖酸铝盐絮凝体的动态特性 |
| 摘要点击 1867 全文点击 1889 投稿时间：2001-08-30 修订日期：2001-11-08 |
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| 中文关键词 腐殖酸 铝盐絮凝体 分形维数 动态特性 |
| 英文关键词 humic acids Al humic flocs fractal dimension dynamic properties |
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| 中文摘要 |
| 通过显微摄影分析研究了腐殖酸铝盐絮凝体成长的动态过程以及在混凝过程中絮凝体构造(分形维数)的变化规律.结果表明,在腐殖酸混凝过程中,随搅拌历时延长,絮凝体粒径不断成长变大,最终达到平衡状态.随着絮凝体的成长,其构造呈现由密实逐渐向疏松过渡的过程,空隙率变大,二维分形维数由初期的1.8左右下降到1.4左右.絮凝体分形维数Df和粒径df之间具有Df=Adf- |
| 英文摘要 |
| Using a microscopic technique, the dynamic properties of Al humic flocs were studied and the regularity of the variation of floc structure, i.e. fractal dimension, was discussed. The results show that during coagulation floc size increased with agitation time and finally reacheds an equilibrium state. As flocs grow their structure gradually become looser with an increase of void ratio, and results in a substantial decrease of their fractal dimension from the initial value of 1.8 to about 1.4. There exist an exponential relation between the fractal dimension Df and the floc size df as Df=Adf-n. It was explained by theoretical analysis that the decrease of Df with increase of df as was the result of random collision and agglomeration of primary particles. The alum dosage directly affected the rate of floc growth and its equilibrium size. Overdosing may bring about an apparent decrease of the fractal dimension of the flocs. |
