XIAODan,NANJun,HEWei-peng,et al.Analysis of Lag Effect during Combined Flocculation and Sedimentation Processes Based on Evolution of Turbid Particle Size Distribution[J].China Water & Wastewater,2025,41(7):24-32.
基于浊质粒径分布演变的絮凝沉淀工艺滞后性分析
- Title:
- Analysis of Lag Effect during Combined Flocculation and Sedimentation Processes Based on Evolution of Turbid Particle Size Distribution
- Keywords:
- water treatment plant; flocculation and sedimentation; coagulant dosage; turbidity; particle size distribution; lag effect
- 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15~25 μm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15~25 μm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15~25 μm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，10~15 μm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>10 μm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。
- Abstract:
- 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 15-25 μm. 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 10-15 μm 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 10 μm at the conclusion of flocculation, and a lower count of particles exceeding 10 μm was associated with higher turbidity removal rates.
相似文献/References:
[1]李婷,董志峰,张松芳,等.东江水源和本地水库水源原水混用的给水厂运行实践[J].中国给水排水,2020,36(22):23.
LI Ting,DONG Zhi-feng,ZHANG Song-fang,et al.Operation Practice of Mixing Raw Water from Dongjiang River and Local Reservoir in a Waterworks[J].China Water & Wastewater,2020,36(7):23.
[2]郑全兴.基于水厂管理反馈工艺设计注意细节的探讨[J].中国给水排水,2020,36(22):77.
ZHENG Quan-xing.Discussion on Details of Process Design Based on Waterworks Management Feedback[J].China Water & Wastewater,2020,36(7):77.
[3]彭尧,柳彬彬,朱波,等.BIM技术用于合肥市第六水厂提升改造工程[J].中国给水排水,2022,38(6):127.
PENGYao,LIUBin-bin,ZHUBo,et al.Application of BIM in the Upgrading and Reconstruction Project of Hefei No.6 Waterworks[J].China Water & Wastewater,2022,38(7):127.
[4]刘志刚,徐巧,何建荣,等.宁波市江东水厂超滤膜工艺运行效能分析[J].中国给水排水,2023,39(12):112.
LIUZhi-gang,XUQiao,HEJian-rong,et al.Operation Efficiency Analysis of Ultrafiltration Membrane Process in Ningbo Jiangdong Waterworks[J].China Water & Wastewater,2023,39(7):112.
[5]肖丹,南军,范雅倩,等.某自来水厂应对水源藻类突发污染的运行探索与实践[J].中国给水排水,2024,40(3):9.
XIAODan,NANJun,FANYa-qian,et al.Exploration and Practice of a Waterworks to Deal with Sudden Algae Pollution in Water Source[J].China Water & Wastewater,2024,40(7):9.
[6]魏忠庆,吕会,许兴中,等.福州市东南区水厂运营阶段碳排放核算研究[J].中国给水排水,2024,40(21):54.
WEIZhong-qing,LüHui,XUXing-zhong,et al.Accounting of Carbon Emission from Dongnan Waterworks of Fuzhou City during Operational Stage[J].China Water & Wastewater,2024,40(7):54.