DUANShu-le,JIANGCai-fang,DONGHui-yu,et al.Impact of Filter Backwash Water Reuse on the Water Quality and Treatment Efficiency: A Case Study in a Full-scale Drinking Water Treatment Plant[J].China Water & Wastewater,2024,40(15):1-8.
Impact of Filter Backwash Water Reuse on the Water Quality and Treatment Efficiency: A Case Study in a Full-scale Drinking Water Treatment Plant
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第40卷
Number:
第15期
Page:
1-8
Column:
Date of publication:
2024-08-01
- Keywords:
- filter backwash water; reuse; drinking water treatment plant; water quality; treatment efficiency
- Abstract:
- Filter backwash water (FBW) is a major component of residuals produced in drinking water treatment plants (DWTPs) and has been widely recycled. To investigate the impacts of FBW direct reuse on water quality across process stages and unit process treatment efficiency in DWTPs, field investigations were conducted at a prominent large-scale DWTPs located in southern China. The water quality and treatment efficiency before and after recycling FBW were comprehensively compared and evaluated by utilizing a multifaceted approach that included periodic surveillances, pollution load calculations, and health risk assessments. At a 5.0% reuse ratio (volume ratio of FBW to raw water), FBW direct reuse significantly elevated influent turbidity and Al3+ load, comprising 70.7% and 41.4% of the mixed water load, respectively, while reducing the health risk of detected pesticides in drinking water exposure. Following reuse, the coagulation-sedimentation process showed reduced removal of UV254 and dissolved organic carbon (DOC) but increased removal of inorganic parameters, permanganate index (CODMn), and pesticides compared to non-reuse conditions. Moreover, the study highlighted filter beds as key units for the accumulation of DOC, CODMn, and pesticides, affirming that the implementation of FBW direct reuse did not result in the violation of the Standards for Drinking Water Quality (GB 5749-2022). This finding could provides crucial insights for enhancing water resource utilization while ensuring water quality safety.
Last Update:
2024-08-01