净水技术2025，Vol.44Issue(1)：74-80,108,8.DOI:10.15890/j.cnki.jsjs.2025.01.009
炭砂滤池水反冲洗参数优化中试
Pilot Test of Optimization of Water Backwash Parameters in Activated Carbon-Sand Filter
摘要
Abstract
[Objective]Conduct optimization design of water backwash parameters for the activated carbon-sand filter to reduce water consumption and ensure backwashing effectiveness,which can provide technical reference for the actual operation of the activated carbon-sand filter in the water plant.[Methods]A pilot test of an activated carbon-sand filter was conducted using sedimented water as the feedwater from a water treatment plant(WTP)in Nanjing.The impact of various water backwash parameters on the layering within the filter and the turbidity of filtered water was investigated,and the performance and bacterial community structure of the activated carbon-sand filter under the optimal combination of water backwash parameters were thoroughly examined.[Results]The findings of this study indicated that a water backwash intensity ranging from 12 L/(m2.s)to 15 L/(m2·s)led to optimal layering within the activated carbon-sand filter.Additionally,the combination of 7 minutes of backwash at an intensity of 9 L/(m2·s)followed by 5 minutes of layering backwash at 12 L/(m2·s)proved to be effective in ensuring thorough cleaning of the filter and reducing the turbidity of the filtered water to less than 0.7 NTU.Throughout the operational period,notable removal efficiencies were observed,with a 95.8％reduction in turbidity,an 11.1％decrease in permanganate index,and a 45.9％reduction in ammonia nitrogen.Notably,nitrate levels increased in effluent.Moreover,the effluent quality of the activated carbon-sand filter could meet our country's Standards for Drinking Water Quality(GB 5749-2022).Furthermore,the bacterial 16S rRNA gene high-throughput sequencing results revealed that the dominant bacterial communities within the activated carbon-sand filter primarily consisted of Proteobacteria,Acidobacteriota,and Chloroflexi,which accounted for over 65％of the total bacteria.[Conclusion]Small water backwashing and layering backwashing techniques can guarantee the activated carbon-sand filter's operational efficacy,minimize water consumption,and improve the phenomena of mixed layers in filter media.关键词
炭砂滤池/反冲洗/滤后水/浑浊度/参数优化Key words
activated carbon-sand filter/backwash/filtered water/turbidity/parameter optimization分类
土木建筑引用本文复制引用
鲍寻,袁聪,祖振权,张家萱,秦庆东..炭砂滤池水反冲洗参数优化中试[J].净水技术,2025,44(1):74-80,108,8.基金项目
南京水务集团有限公司科技创新项目(YF2022-011) （YF2022-011）
