ZHAO Bei,LI Lin-bin,ZHAO Yun-peng,et al.Influence of Source Water Quality on Iron Release in Groundwater Distribution Networks and Its Control Technology[J].China Water & Wastewater,2020,36(23 23):52-57.
Influence of Source Water Quality on Iron Release in Groundwater Distribution Networks and Its Control Technology
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第36卷
Number:
23 23
Page:
52-57
Column:
Date of publication:
2020-12-01
- Keywords:
- surface water; groundwater; pipe scale; iron release; Larson ratio
- Abstract:
- To prevent the “red water” problem caused by source water quality variation in groundwater distribution networks, a pilot-scale test was carried out by conveying effluent from two actual surface water plants with different water quality in a long-term groundwater pipeline in a northern city. Scale layer of the pipe conveying groundwater was thin, which composed of goethite as the main crystal iron oxide with magnetite/goethite mass ratio of 0.09 and low stability. After conveying surface water with Larson ratio (LR) of 1.72, the increase of effluent turbidity and the total iron in the pipeline were higher than those of surface water with LR of 0.37. The surface water with high chloride and sulfate concentration and larger LR had great influence on the scale of the groundwater pipeline. By increasing the influent free residual chlorine concentration for oxidation and stabilization treatment of the pipeline in advance could effectively reduce the release of iron and the risk of “red water”.
Last Update:
2020-12-01