不同矿石对反渗透淡化水的调质效果研究（英文）

Effect of different ores on water qualityadjustment of seawater desalinated byreverse osmosis

反渗透海水淡化已成为解决淡水危机的一种有效方法,但反渗透淡化水的化学稳定性差,使用过程中会腐蚀管网,作为饮用水存在一定的健康风险.采用溶解矿石法对反渗透淡化水的水质进行调节.对麦饭石、白云石、石灰石、进口矿石的理化性能(包括成分、物相组成、孔隙率及孔径分布、表面形态)进行了分析,并在此基础上对比分析了4种矿石对反渗透淡化水的调质效果.结果表明,进口矿石经人为加工后孔隙增多,溶出速率明显变快,调质后出水的硬度、碱度、Mg2+质量分数均高出其他3种原矿石50%以上,但其出水pH值过高,Ca2+质量分数低于石灰石,与自来水相比仍有一定差距,未来应致力于研制一种比表面积大、溶解速率快、无需对淡化水酸化而直接调质的调质剂.

In many places,reverse osmosis seawater desalination plays an important role in solving freshwater crisis.In spite of its superior quality,instability of desalinated water may be corrosive to water distribution systems,thus may pose a threat on human health.To solve this problem,four ores were used to adjust the quality of the desalinated water.The physical and chemical properties of maifanshi,dolomite,limestone and an imported ore,including composition,XRD（X-ray Diffraction）,porosity and pore size distribution,surface morphology were analyzed.Based on these properties,the effects of the four ores on water quality adjustment of the desalinated water by reverse osmosis were studied.The results indicate that the porosity and dissolution of the imported ore are improved obviously after the artificial process.The hardness,alkalinity,Mg^2＋contents of the import ore are 50% higher than any other ores,while the pH value of the effluent is too high,the Ca^2＋content in the effluent is lower than that of limestone.Still,there is a certain gap compared with the tap water.In the future,research should focus on the development of modifying agents with large surface areas and faster dissolution rate,which can adjust the desalinated water without acidifying the influent.