麦饭石优化生活饮用水的改性研究

A Research on the Modification of Medical-Stone Used to Optimize Drinking Water

把经过酸改性、热改性以及复合改性的麦饭石分别用于处理自来水,通过考察经改性麦饭石处理前后自来水中Cu、Mn、Zn和Pb离子浓度的变化,研究了酸浓度、热改性温度以及复合改性条件对麦饭石的溶出性及吸附性的影响;测定了改性麦饭石的溶出及吸附透过曲线。结果表明热改性和盐酸改性对麦饭石的离子交换性能有促进作用:先用1.5 mol/L的盐酸改性,再经400℃热改性的麦饭石可以除去自来水中81.9%的Pb,并使水中Zn的浓度增加0.132 mg/L;在200 m L/min流速下,60 g改性麦饭石,可以有效优化自来水8 h,平衡时间约为12 h。

The medical-stone modified by acid, heat or both of them was used to treat drinking water. The impacts of acid concentration, temperature and conditions of composite modification on the dissolution and absorption of medical-stone were researched by studying the differences of Pb, Cu, Mn and Zn ions in the water between before and after treatment by modified medical-stone. Dissolution and absorption break through curve of modified medical-stone were determined. Results show that both heat modification and acid modification can promote ion-exchange properties of the medical-stone. Medical-stone modified by 1.5 mol/L hydrochloric acid firstly, and then modified at 400 ℃ can remove 81.9% of Pb in drinking water and increase the concentration of Zn by 0.132 mg/L. At a flow rate of 200 m L/min, 60 g of modified medical-stone can effectively optimize the water for 8 hours, equilibrium time is about 12 hours.