中文摘要：

南方某市多年来频发管网“黄水”问题，尤其在2014年，仅在某供水片区就发生了多起“黄水”事件。从用户投诉入手，分析了该区“黄水”的时空分布特征。通过管段冲洗和管网水取样发现，以锰为主、锰和铁对“黄水”形成均有贡献，管网内锰的沉积是“黄水”形成的主要原因。分析该市历年“黄水”事件发现，原水高锰浓度与管网“黄水”直接关联。传统工艺无法应对原水锰浓度的升高；由于缺乏原水锰浓度监测的及时反馈，高锰酸钾氧化法也不能有效控锰。该市和其他地方的案例都表明，0．1mg／L的锰控制水平不能有效抑制“黄水”的发生。当出厂水锰均值持续低于0．005mg／L时，监测到管网内沉积锰发生轻度释放，锰实现负累积。为控制“黄水”，需要提高原水锰的监测和出厂水锰的检测能力。

英文摘要：

Yellow water events in drinking water distribution system （DWDS） took place frequent- ly in a southern city of China over the years, especially in 2014, when a number of yellow water failures broke out in a certain area. The temporal and spatial distribution characteristics of yellow water in DWDS were revealed through the analysis of consumer complaints. The analysis results of hydraulic flush solids and tap water samples in DWDS indicated that both manganese and iron contributed to the occurrence of yellow water while manganese was the primary contributor. Mn deposition in DWDS was considered as the main cause of yellow water in this area. High Mn concentration in source water was found to be directly related to the yellow water event, which was based on the analysis of yellow water records over the years. Traditional water treatment failed to deal with the considerable rise of Mn concentration in source water. Due to the lack of real-time feedback of source water monitoring results, potassium permanganate could not remove Mn very effectively. Cases of this city and other places suggested that 0.1 mg/L limiting value for Mn was unable to control the risk of yellow water. Based on the monitoring data of DWDS, slight release of Mn from pipe walls was observed when average Mn concentration of treated waier remained below 0.005 mg/L. That is, Mn achieved negative accumulation ill DWDS. To prevent yellow water events, the monitoring ability of Mn in source water and detectability of Mn in treated water need to be improved.