利用分形维数优化混凝中的能耗分配

Optimization of energy consumption distribution with fractal dimensionality in coagulation

为了确定聚硅铁混凝剂处理含铅工业废水的最佳水力条件,将絮凝阶段的搅拌强度G和搅拌时间t分为不同的三个阶段,并利用正交试验得出各个阶段最优的水力条件:G1=67.7s-1,t1=3 min;G2=57.8 s-1,t2=5 min;G3=23.9 s-1,t3=7 min。结合分形理论在水处理中的应用,通过分形维数对最佳分配方案进行分析,得出每个阶段絮体适宜的分形维数分别约为1.48,1.66和1.80,此时絮体结构密实且易沉降,能耗最低。将分形维数与能耗分配相结合,不但可以有效说明能耗分配方案的合理性,而且可以为絮凝池的设计提供数据支持,使混凝工艺经济、高效。

To confirm the optimal hydraulic condition of polysilicic ferric coagulant for the treatment of industrial wastewater with lead,the three different stages of stirring intensity G and stirring time t were designed in the flocculation process.The optimal hydraulic conditions of each stage by orthogonal experiments were G1=67.7 s-1,t1=3 min,G2=57.8 s-1,t2=5 min,G3=23.9 s-1,t3=7 min.Combining the application of fractal theory for water treatment and selecting the best distribution parameters with the fractal dimensionality,the appropriate fractal dimensionalities of flocs in each stage were about 1.48,1.66 and 1.80 respectively.The flocs were dense,easy settlement and low energy consumption under this condition.Therefore,it could not only effectively illustrate the rationality of the energy consumption distribution,but also offer data support for designing flocculation tank by combining fractal dimensionality with energy consumption distribution,and the coagulation process would be economical and efficient.