XIEYa-wei,ZHUFang-jun,FENGWei-hua,et al.Optimization and Engineering Verification of Backwashing Parameters of V-shaped Filters[J].China Water & Wastewater,2025,41(15):61-67.
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Optimization and Engineering Verification of Backwashing Parameters of V-shaped Filters

China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU] volume: 第41卷 Number: 第15期 Page: 61-67 Column: Date of publication: 2025-08-01
Author(s):
XIE　Ya-wei1;  ZHU　Fang-jun1;  FENG　Wei-hua2;  GAO　Hong-cheng2;  YU　Wen-qing1;  LIU　Hong-yuan1;  ZHANG　Ben1;  WANG　Li-biao2;  LONG　Hong-chi2
（1. College of Civil Engineering， Zhejiang University of Technology， Hangzhou 310014， China； 2. Hangzhou Yuhang Water Affairs Holding Group Co. Ltd.， Hangzhou 311100， China）
Keywords:
V-shaped filter;  combined air-water backwashing;  filter medium loss
Abstract:
V?shaped filters are extensively utilized in waterworks owing to their robust interception capacity of the filter layer, extended backwashing cycle, and superior effluent quality. Nevertheless, during operation, if the backwashing parameters are improperly configured, this may compromise the stability of the filter media and lead to issues such as excessive energy consumption. This paper carried out a pilot test of the V-shaped filter (with a water production capacity of 24 m3/d), a production test (with a water production capacity of 2.5×104m3/d), and a long-term operational research. During the combined air-water backwashing phase, when the filter layer was in a slightly expanded state, and the ratio of combined air-water backwashing water flushing intensity to individual water flushing intensity (vw/vmf) ranged from 0.40 to 0.60， a strong stripping effect on impurities adhered to the filter medium particles colud be obtained. The results of the production test indicated that individual air flushing intensity could be reduced from 8.8 L/(s·m2) to 6.6 L/(s·m2) during the combined air-water backwashing phase when the vw/vmf was decreased to 0.49. During both the normal temperature period and the low-temperature period, the effluent turbidity of the filter in the optimized production test remained consistently below 0.1 NTU, satisfying the requirements while simultaneously addressing the issue of sand leakage in the filter. In comparison with the original operational plan of the waterworks, the optimized operation scheme had a total water saving rate of 23.2%, and a power saving rate of 49.5%, demonstrating remarkable energy saving effect.
Last Update: 2025-08-01