XIAO Fan,YU Hong-jing,LIU Xiao-dong,et al.Design and Practice of an Engineering Device for Improving Sand Loss in V?type Filters[J].China Water & Wastewater,2022,38(2022 1 1):53-59.
Design and Practice of an Engineering Device for Improving Sand Loss in V?type Filters
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第38卷
Number:
2022 1 1
Page:
53-59
Column:
Date of publication:
2022-01-01
- Keywords:
- V-type filter; backwashing; sand loss; model filter column test
- Abstract:
- The quantitative relationship between the filter medium loss G and the air flushing strength L, the water flushing strength M and the drainage tank height H in the process of gas/water backwashing of filter media was explored through using model filter column test. Based on this, the design parameters were determined and a device for improving sand loss in the V-type filter was designed, which was installed on both sides of the drainage tank of the V-type filter. The actual application showed that the device could improve the sand loss of the V-type filter, and the reduction rate of sand loss reached 35.1%. The installation of the device according to the theoretical drainage tank height determined by the quantitative relationship not only effectively controlled the sand loss, but also had the lowest effluent turbidity in the backwashing process and the shortest time to achieve the flushing performance at the end of backwashing. The economic evaluation showed that the device had the advantages of low investment, simple installation, on?line construction, no impact on production and universal applicability to V-type filters.
Last Update:
2022-01-01