LIUJia-bo,BAITian-yu,LUOWen-qian,et al.Experimental Investigation and Practical Application of Blending Old and New Filter Media in Sand Filter[J].China Water & Wastewater,2025,41(9):47-52.
Experimental Investigation and Practical Application of Blending Old and New Filter Media in Sand Filter
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第41卷
Number:
第9期
Page:
47-52
Column:
Date of publication:
2025-05-01
- Keywords:
- sand filter; filter media; blending; filtering performance
- Abstract:
- Sand filter filtration is a widely adopted technology in current water treatment processes, wherein the filter media, as a critical component, requires regular testing to ensure compliance with the water treatment standards. The old filter media from the sand filter in a water purification plant in Tianjin was blended with new filter media featuring different effective particle sizes. Through filtration experiments, the filtering performance and operational parameters of the old filter media, standard filter media, and mixed filter media were systematically compared. Additionally, the feasibility of mixing for upgrading the filter media was evaluated via screening tests, followed by practical application in production. After the new and old filter media were mixed in equal proportions, the effluent demonstrated improved performance in terms of turbidity and oxygen consumption removal. Additionally, the effluent turbidity remained more stable compared to the operation using only the old filter media. In full-scale application, blending the old filter media with fine filter media having the effective particle size of 0.75-0.85 mm could meet the effective particle size standard for water treatment filter media when the mixing ratio was maintained at 15%-20%. This approach effectively restores the filtration performance of the existing filters in water treatment plants while significantly reducing production costs compared to complete replacement of the filter media.
Last Update:
2025-05-01