给水厂砂滤池滤速变化对过滤性能的影响研究
王 玮1,王小𠇔2,史永浩2,3,范江涛4,张建锋1

(1.西安建筑科技大学 环境与市政工程学院,陕西 西安 710055; 2.清华大学环境学院 环境模拟与污染控制国家重点联合实验室,北京 100084; 3.南京市规划和自然资源局高淳分局,江苏 南京 211300; 4.延安水务环保集团延河供水公司,陕西 延安 716000)

V型滤池; 滤速; 浊度; 絮体分布; 水处理

Influence of fluctuating variation of filtration rate on sand filter performance
WANG Wei1, WANG Xiaomao2, SHI Yonghao2,3, FAN Jiangtao4, ZHANG Jianfeng1

(1.School of Environmental and Municipal Engineering, Xi'an Univ. of Arch. & Tech., Xi'an 710055, China; 2.State Key Joint Laboratory of Environmental Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China; 3.Gaochun Branch of Nanjing Municipal Planning and Natural Resources Bureau, Nanjing 211300, China; 4.Yan'an Water Environmental Protection Group Yanhe Water Supply Co. Lit. Yan'an 716000, China)

type V-filter; filtration rate; turbidity; flocs distribution in filter; water treatment

DOI: 10.15986/j.1006-7930.2023.03.017

备注

基于生产滤池中滤速变化特征,采用模型滤柱研究了滤速波动对滤后水浊度和滤层截留絮体分布的影响; 通过生产实测,分析讨论了实际运行的V型滤池中滤速变化特征及其对滤后水浊度的影响.实验研究结果表明:滤速波动的振幅和频率影响滤后水浊度和截留絮体分布,在一定范围内振幅越大、频率越高,滤后水浊度变化幅度越大、絮体在滤层的分布越均匀.生产实测表明:滤速增加对滤后水浊度的影响在过滤后期较初期明显,在滤速增幅和增长率基本一致的条件下,过滤后期滤速增加会引起滤后水浊度升高; 小于2.0(m/h)/h的滤速增长率,无论是在过滤初期还是过滤后期都未引起显著的滤后水浊度增加; 成组布设的滤池组(格数≥10)中,由其他滤池反冲洗引起的单格滤池强制滤速特征并不明显.
Based on the fluctuating characteristics of filtration rate changes in production filters, a model filter column was used to study the effects of filtration rate fluctuations on the turbidity of filtered water and the distribution of intercepted flocs in the filter layer. The characteristics of filtration rate fluctuation in the actual Type V-filter and the influence on the turbidity of the filtered water were analyzed and discussed based on the measurement of filtered water. The results showed that the amplitude and frequency of filtration rate fluctuation affected the turbidity of filtered water and the distribution of intercepted flocs in the filter, and within a certain range, the larger the amplitude and the higher the frequency, the greater the variation of turbidity of filtered water and the more uniform the distribution of flocs in the filter layer. In practical operations, the increase of the filtration rate had a bigger impact on the turbidity fluctuation of the filtered water in the later filtration stage than that in the initial stage. With the same increases and growth rate of filtration rate, the turbidity of the filtered water in the later filtration stage increased significantly. The increase of filtration rate within a smaller rate(less than 2.0(m/h)/h)did not induce the turbidity of the filtered water to fluctuate substantially either in the initial or later stage of filtration. The impact on the increase of forced filtration rate for a filter unit caused by the backwashing of other filter unit(s)in the filter group(units ≥ 10)was not obvious.