城市供水管网中铝形态特征分析  

Analysis on Morphological Characteristics of Aluminum in Urban Drinking Water Distribution System

作　　者：李礼 赵蓓 柴文 顾军农 李玉仙 LI Li;ZHAO Bei;CHAI Wen;GU Jun-nong;LI Yu-xian(Beijing Engineering Research Center for Drinking Water Quality,Technology Institute of Beijing Waterworks Group Co.Ltd.,Beijing 100192,China)

机构地区：[1]北京市自来水集团有限责任公司,北京市供水水质工程技术研究中心,北京100192

出　　处：《中国给水排水》2022年第5期9-13,共5页China Water & Wastewater

基　　金：国家水体污染控制与治理科技重大专项(2017ZX07108002)。

摘　　要：城市供水管网的水力及水质变化均会对管网水中铝的形态产生一定的影响,为了明确管网中铝的形态特征及变化规律,采用挖取的实际管段设置了不同的管段通水环境,考察管段进水和管段浸泡后出水中溶解铝、颗粒铝、总铝浓度的变化情况。结果显示,管网内水力条件较好时析出颗粒铝的概率较小;pH值升高会促进颗粒铝的溶解;新生成的颗粒铝易于被水流带出;水流停滞、pH值降低是促进颗粒铝发生析出和沉积的重要因素;非均相体系中的颗粒铝被水流带出,是导致少数龙头水总铝过高的原因。The hydraulic and water quality changes in the urban drinking water distribution system will have a certain influence on the form of aluminum in water. To clarify the morphological characteristics and variation rules of aluminum in the pipe network, different water supply environments were set in actual excavated pipe sections, and the changes of dissolved aluminum, particulate aluminum and total aluminum concentrations in the influent and effluent after soaking of the pipe sections were investigated. When the hydraulic condition in the pipe network was good, the probability of precipitation of particulate aluminum was small. The rise of pH promoted the dissolution of particulate aluminum. The newly formed particulate aluminum was easily carried out by the water flow. The stagnation of water flow and the decrease of pH were the key factors promoting the precipitation and deposition of particulate aluminum. The precipitated particulate aluminum in heterogeneous system was carried out by water flow,which led to high total aluminum concentration in a few tap water.

关 键 词：供水管网 铝形态特征 颗粒铝 

分 类 号：TU991[建筑科学—市政工程]