研究了几种常见氧化剂对饮用水中嗅味物质2-甲基异莰醇(2-methylisoborneol,2-MIB)的相对氧化去除效能.结果表明,KMnO4、NaClO、ClO2和H2O2投加量达到50mg·L^-1时,氧化3h~24h,高浓度的2-MIB(25μg·L^-1左右)的去除效率为10%-21%,对低浓度的2-MIB(10μg·L^-1左右)的去除效率为45%~53%.这些氧化剂对2-MIB的去除效果均弱于臭氧.臭氧投量为3mg·L^-1时,氧化时间为5min,在偏酸性条件下,2-MIB的去除率可达60%以上;而中性及偏碱性条件下对2-MIB的去除率可达90%以上.臭氧化过程中形成的自由基对于2-MIB氧化效果显著,因此,自由基是分解水中2-MIB的主要成分.
The removal efficiencies of 2 - methylisoborneol ( 2 - MIB) oxidized by several ordinary oxidants, such as KMnO4, NaClO,ClO2, H2O2 etc were compared. 2 - MIB removal efficiencies was 10% -21% at the higher initial concentration of 2 -MIB (25 μg·L^-1), while that was 45% -53% at the lower initial concentration of 2 - MIB (10 μg·L^-1), with the oxidants dose of 50 mg· L^-1 and oxidizing time of 3 h -24 h. Compared with other oxidants, ozone was the most effective one. 2 - MIB removal rate was more than 90% under neutral or alkaline condition, and that was more than 60% in acidic phase, with ozone dose of 3 mg· L^-1 and oxidizing time of 5 min.