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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。
Cement mortar liner because of its chemical stability, good corrosion resistance in the field of water has been widely used. However, when the high-quality reclaimed water is transported (the reclaimed water that has undergone the reverse osmosis process has very little ion content and the water quality is close to pure water and is called high-quality reclaimed water), p H value increases and the problem of changes in water quality parameters such as calcium ion precipitation becomes obvious. There is also potential damage to the pipe material. A pipe network simulation device of DN100 cement mortar lined with cast iron pipe with a length of 120 m was constructed. The variation of water quality of cement mortar lined pipe with high quality reclaimed water was studied. The results showed that the water quality of cement mortar liner was obviously changed when the reclaimed water was transported. The p H value, TDS (total dissolved solids), conductivity, calcium ion concentration and the elemental concentrations of silicon, sulfur and aluminum were obviously increased. Fe , Mn ions are precipitated. The change of water quality is mainly caused by dissolution and dissolution of calcium hydroxide in cement mortar and dissolution and dissolution of hydrates.