LILi,ZHAOBei,CHAIWen,et al.Analysis on Morphological Characteristics of Aluminum in Urban Drinking Water Distribution System[J].China Water & Wastewater,2022,38(5):9-13.
城市供水管网中铝形态特征分析
- Title:
- Analysis on Morphological Characteristics of Aluminum in Urban Drinking Water Distribution System
- Keywords:
- drinking water distribution system; aluminum morphological characteristics; particulate aluminum
- 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。
- Abstract:
- 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.
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