高浓度悬浊液絮体分形结构的发展变化研究

Study on Development and Evolution of Fractal Structures of Aggregates for High-Concentration Turbid Liquors

以黄河泥沙为代表的高浓度悬浊液架桥絮凝实验研究表明,絮体结构具有分形特性。絮体的分形构造在从疏松多孔、开放的分枝状DLCA构造逐步演变到密实的最佳RLCA构造后,又开始呈现疏松脆弱结构的特征。絮体的最佳分形结构只能保持一段时间。絮体分形结构的发展变化规律可用参数"分维"来表征。利用"分维"作为定量控制工具以获取沉降性能与脱水性能良好的理想絮体构造。絮体分形结构还受含沙量、搅拌强度、搅拌时间等因素的影响。

Bridging flocculation settlement experiment for high-concentration turbid liquor (HCTL) represented by Yellow River sediments indicates that the structures of aggregates have a fractal property. Fractal structures of aggregates can change from a big size and loose and open-branching DLCA structure to a small size and minimum average void and compact optimum RLCA structure gradually, and then the fractal structures become loose and vulnerable again. The optimum fractal structure of aggregates will only have a certain lifetime. Development and evolution irregularity of fractal structures of aggregates can be characterized by the parameter `fractal dimension D'. The `fractal dimension D' can be used as a tool to obtain ideal structures of aggregates quantitatively, which has a better settling and dewatering behaviors. Fractal structures of aggregates are affected by raw turbidity of the liquor, stirring rates and stirring time, etc.