YUANHai-wei,HULu,ZHONGTao,et al.Characteristics of Sediment Accumulation in Cast Iron Water Supply Pipelines[J].China Water & Wastewater,2025,41(11):85-90.
Characteristics of Sediment Accumulation in Cast Iron Water Supply Pipelines
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第41卷
Number:
第11期
Page:
85-90
Column:
Date of publication:
2025-06-01
- Keywords:
- water supply pipeline; scale; sediment; flushing water; bioenrichment; release risk
- Abstract:
- The ice pigging technology was utilized to clean a water supply network in the South China. Additionally, the pollution status of the pipeline was evaluated by analyzing factors such as flushing duration, the physicochemical characteristics of the flushing water, and the composition of the microbial community. The sediment within the pipeline was released quickly during the initial phase of flushing. After six minutes, the turbidity and total particle count in the water reached their peak values. The flushing water exhibited alkaline characteristics. The primary metallic contaminants identified were iron, resulting from pipeline corrosion, and aluminum, which is the principal component of the flocculant. Notably, the peak concentration of chloride ions in the sediment could reach up to 11 731 mg/L. The variation in TOC suggested an enrichment of organic matter within the pipeline wall, thereby supplying a carbon source that supported microbial growth. Analysis of the microbial community structure revealed that the predominant microorganisms were Phreatobacter, with relative abundance accounting for 73%. Given the presence of Sphingomonas and Pseudomonas (including opportunistic pathogenic bacteria), attention should be directed towards the potential risks associated with microbial release.
Last Update:
2025-06-01