基于浊质粒径分布演变的絮凝沉淀工艺滞后性分析  

Analysis of Lag Effect during Combined Flocculation and Sedimentation Processes Based on Evolution of Turbid Particle Size Distribution

作　　者：肖丹 南军 贺维鹏[3] 范雅倩 林显增 XIAO Dan;NAN Jun;HE Wei-peng;FAN Ya-qian;LIN Xian-zeng(School of Environment,Harbin Institute of Technology,Harbin 150090,China;Foshan City Chancheng Disrtict Water Supply Co.Ltd.,Foshan 528000,China;College of Civil Engineering,Hunan University,Changsha 410082,China)

机构地区：[1]哈尔滨工业大学环境学院,黑龙江哈尔滨150090 [2]佛山市禅城区供水有限公司,广东佛山528000 [3]湖南大学土木工程学院,湖南长沙410082

出　　处：《中国给水排水》2025年第7期24-32,共9页China Water & Wastewater

基　　金：佛山市自筹经费类科技创新项目(2320001006055);湖南省自然科学基金资助项目(2024JJ5078);长沙市自然科学基金资助项目(kq2402076)。

摘　　要：针对絮凝投药滞后性这一特征,通过检测不同粒径范围的絮体颗粒数在进水条件与投药量变化情况下的趋势及其滞后性,分析了絮体颗粒数分布的时空变化,以实现水厂投药的快速响应,提高其稳定性。研究表明,进水流量的变化可通过15~25μm粒径范围内的絮体颗粒数变化迅速反映。当进水流量减小时,絮凝前期水样中15~25μm的颗粒数表现出较小的滞后性,在8 min左右,颗粒数量快速减少;而当进水流量增加时,絮凝前期水样中15~25μm的絮体颗粒数在4 min后开始增加。在进水浊度突变的情况下,10~15μm的絮体颗粒数在絮凝前期也表现出快速变化,滞后性较小,通常在4 min内即可反映进水浊度的突然变化。此外,沉后水浊度去除率与絮凝末期粒径>10μm的颗粒数之间具有良好的相关性,该粒径的颗粒数越少,沉后水浊度去除率越高。In order to address the lag characteristics associated with flocculant dosing,the trends and variations in floc particle numbers across different size ranges were investigated under varying influent conditions and dosages.The analysis emphasized the spatiotemporal changes in floc particle distribution to facilitate rapid dosing responses at water treatment plants,thereby enhancing operational stability.The results indicated that fluctuations in influent flow rate could be quickly reflected by changes in the number of floc particles within the size range of 15-25μm.Specifically,when the influent flow rate decreased,the number of particles in this size range in the pre-flocculation water demonstrated minimal lag during the early flocculation phase,typically around 8 min,accompanied by a rapid decline in particle numbers.Conversely,when the influent flow rate increased,the number of floc particles in this range in the pre-flocculation water began to rise approximately 4 min into the early flocculation phase.In the circumstances of sudden changes in influent turbidity,the number of floc particles in the range of 10-15μm also exhibited rapid fluctuations during the early flocculation phase,with minimal lag,generally reflecting abrupt changes in influent turbidity within 4 min.Moreover,a strong correlation existed between the turbidity removal rate after sedimentation and the number of particles greater than 10μm at the conclusion of flocculation,and a lower count of particles exceeding 10μm was associated with higher turbidity removal rates.

关 键 词：水厂 絮凝沉淀 混凝剂投加量 浊度 颗粒粒径分布 滞后性 

分 类 号：TU991[建筑科学—市政工程]