零价锌还原水中痕量亚硝基二甲胺的效能

Efficiency of reduction of trace nitrosodimethylamine (NDMA) in water by zero-valent zinc

摘要:

为去除水中亚硝基二甲胺(NDMA)污染,研究采用零价锌还原降解水中痕量亚硝基二甲胺(NDMA)的效能,考察反应体系中锌粉投量、NDMA初始质量浓度、溶解氧、pH值、反应温度等对处理效果的影响.结果表明:零价锌可以有效还原降解NDMA,锌粉初始投量为10 g.L-1时,反应14 h后去除率可达99%以上;水中溶解氧和NDMA初始质量浓度对去除率的影响不大;pH值和温度对零价锌还原降解NDMA的影响显著,pH值越小,温度越高,反应进行得越快.

Abstract:

To investigate the removal efficiency of nitrosodimethylamine(NDMA) from water by zero-valent zinc,reduction experiments of trace concentration of NDMA by zero-valent zinc were carried out,and the effects of the initial amount of zinc,initial concentration of NDMA,dissolved oxygen concentration,solution pH,temperature on the reduction of NDMA were studied.With the initial amount of 10 g·L-1 zinc,the removal efficiency of NDMA could reach to above 99% at the reaction time of 14 h.The effect of dissolved oxygen and initial NDMA concentration on the reduction of NDMA are not remarkable while the pH and the temperature of solution could influence the reduction of NDMA by zinc greatly.The smaller the pH is or the higher the temperature is,the higher the removal rate of NDMA is.