水泥砂浆内衬管输配高品质再生水水质变化规律  

Analysis of Water Quality Change in Reclaimed Water Conveyed in Cement Mortar Lined Iron Pipe

作　　者：余康华 崔勇[1] 张子潇 裴超迎 刘书明[1] 

机构地区：[1]清华大学环境学院,北京100084 [2]北京博大水务有限公司,北京100176

出　　处：《中国给水排水》2017年第13期50-55,共6页China Water & Wastewater

基　　金：国家重点研发计划"政府间国际科技创新合作重点专项"(2016YFE0118800)

摘　　要：水泥砂浆内衬管因其化学性质稳定、防腐性能良好在输水领域得到了广泛应用。但在输送高品质再生水(经过反渗透工艺处理的再生水,因离子含量极少,水质接近纯水被称为高品质再生水)时,p H值升高、钙离子析出等水质参数变化问题明显,也存在着对管网材料的潜在损害。搭建了长为120 m的DN100水泥砂浆内衬铸铁管的管网模拟装置,研究了水泥砂浆内衬管输配高品质再生水时水质变化规律。结果表明,水泥砂浆内衬管运输再生水时水质变化明显,p H值、TDS(总溶解固体)、电导率、钙离子浓度以及硅、硫、铝元素浓度都有明显升高,未检测到Fe、Mn离子析出。水质变化主要是由于水泥砂浆中氢氧化钙溶解溶出和水化物的分解溶出导致。Cast iron pipes lined with cement mortar are widely used for water supply, due to its corrosion resistance and chemical stability. However, pH and calcium ion concentrations may change significantly when high quality reclaimed water is conveyed using cast iron pipe lined with cement mortar （high quality reclaimed water is defined as the water with minimal amount of ions, treated by the reverse osmosis technology）. Meanwhile, the erosion of the cement mortar poses a potential risk. In this study, a dynamic simulated water distribution model test-loop, which was 120 meters long and made of DN100 cast iron pipe lined with cement mortar, was built to investigate the impact of changes in the reclaimed water quality. The results showed that parameters of water quality such as pH, TDS, conductivity, calcium, sulfur, aluminum and silicon increased substantially after reclaimed water was conveyed in the system. However, iron and manganese were not detected. The changes in water quality were due to dissolving of calcium hydroxide and other hydrates in the cement.

关 键 词：水泥砂浆内衬管 再生水 水质变化 管网模拟装置 

分 类 号：TU991.2[建筑科学—市政工程]