再生水混凝过程中絮体分形维数与运行优化  

Fractal Dimension and Operation Optimization of Flocs in the Process of Reclaimed Water Coagulation

作　　者：彭柱 李嘉鑫 伍薇[1,2] 刘菁 田一梅 PENG Zhu;LI Jiaxin;WU Wei;LIU Jing;TIAN Yimei(School of Environmental Science and Engineering,Tianjin University,Tianjin 300350,China;Central and Southern China Municipal Engineering Design&Research Institute Co.Ltd.,Wuhan 430010,China)

机构地区：[1]天津大学环境科学与工程学院,天津300350 [2]中国市政工程中南设计研究总院有限公司,湖北武汉430010

出　　处：《环境科学与技术》2021年第11期152-158,共7页Environmental Science & Technology

基　　金：国家水体污染控制与治理科技重大专项(2009ZX07317-005)。

摘　　要：文章以华北地区某再生水厂原水为试验用水,针对其浊度低、水质成分复杂的特点,将分形理论应用于再生水混凝过程分析与最佳运行参数的确定。在小试和中试试验中,通过水下微摄像装置对絮体产生、变化过程的记录分析,研究了絮体分形维数随原水水质、药剂投加及水力条件的变化规律,确定了p H值、PAC投量、前加氯量以及搅拌强度的最佳运行参数,建立了混凝絮体分形维数的数学模型。结果表明,絮体具有良好的分形特性,其沉淀后的出水浊度与分形维数显著相关,模型预测误差较小,可有效预测沉淀出水水质,并指导水厂及时调整混凝运行参数。In this paper,the raw water of a reclaimed water plant in North China is used as the test water,in view of its low turbidity and complex water quality components,the fractal theory is applied to the analysis of the coagulation process of reclaimed water and the determination of the optimal operation parameters.In the small-scale and pilot-scale tests,through the recording and analysis of the formation and change process of flocs by underwater micro camera device,the variation law of floc fractal dimension with raw water quality,reagent dosage and hydraulic conditions is studied,the optimal operating parameters of pH value,PAC dosage,pre-chlorination dosage and mixing intensity are determined,and the mathematical model of coagulation floc fractal dimension is established.The results show that the flocs have good fractal characteristics.The turbidity of the precipitated effluent is significantly correlated with the fractal dimension,and the prediction error of the model is small.It can effectively predict the precipitated effluent quality and guide the water plant to adjust the coagulation operation parameters in time.

关 键 词：再生水 混凝 絮体结构 分形维数 出水浊度 数学模型 

分 类 号：X703.1[环境科学与工程—环境工程]