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):52-57.
水源水质对地下水管网铁释放的影响和控制技术研究
- Title:
- Influence of Source Water Quality on Iron Release in Groundwater Distribution Networks and Its Control Technology
- Keywords:
- surface water; groundwater; pipe scale; iron release; Larson ratio
- 摘要:
- 针对水源水质变化时，地下水供水区域管网可能出现“黄水”的问题，选取北方某市长期输送地下水的管道，通入两种水质差异较大的实际地表水厂出水进行模拟中试。研究发现，输送地下水的管道的管垢层薄，晶体铁氧化物以针铁矿为主，磁铁矿与针铁矿的质量比为0.09，管垢稳定性差。实验结果还表明，通入拉森指数（LR）为1.72的地表水后，管道出水浊度和总铁增加量高于通入拉森指数为0.37的地表水，氯化物和硫酸盐浓度高、拉森指数大的地表水对该类地下水管道的管垢影响较大。通过预先提高通水游离余氯浓度对管道进行氧化稳定处理，可有效减少铁释放，降低发生“黄水”的风险。
- 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”.
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