O3／H2O2艺去除饮用水中2-MIB的效能与机制

以2-甲基异莰醇（MIB）为嗅味物质的代表物，采用过氧化氢／臭氧氧化（O3／H2O2）工艺去除水中嗅味物质，考察了O3／H2O2工艺对水中2一MIB的去除效能与主导作用机制。研究表明，投加H2O2显著提高了单独0，氧化对2-MIB的去除效能，H2O2与O3最佳物质的量比为0．3：1，且2-MIB去除效果随pH值的升高而升高。叔丁醇对2-MIB的去除表现出显著的抑制作用，在O3氧化2-MIB过程中，除O3分子氧化2-MIB外，O3在水中自分解产生的强氧化性的羟基自由基（HO·）也具有协同氧化作用。不同浓度的天然有机物（NOM）对2-MIB去除效果的影响不同，较低浓度的NOM促进了2-MIB的去除，但随着其浓度的升高，2-MIB去除率明显降低。O3／H2O2工艺对水中2-MIB表现出良好的去除效果，是强化去除水中2-MIB等致臭微量有机物的重要工艺。

Efficiency and mechanism of removal of 2-MIB in drinking water by O3/H2O2 process

Taking 2 -MIB as a representative odor compound, the O3/H2O2 process was adopted to remove odor compound from water. The efficiency and leading role mechanism of removal of 2 - MIB in drinking water by the O3/H2O2 process were investigated. The result showed that dosing H2O2 could improve the removal efficiency obviously than only 03 oxidation. The optimal molar ratio of Ha 02 and 03 was 0.3 ： 1, and the removal efficiency was improved as pH value increased. The removal of 2 -MIB could be significant inhibited by tert-butanol. During the 03 oxidation of 2 - MIB, besides 03 molecular oxidation of 2 - MIB, HO · , which produced from self-decomposition of 03 with strong oxidation properties, had a co-oxidation. Different concentrations of NOM had various influence on 2 - MIB removal, lower concentrations of NOM accelerated removal of 2 - MIB, but the removal rate decreased obviously as the concentration increased. The O3/H2O2 process had good efficiency on 2 - MIB removal, and it was a key process for enhanced removal of odor compounds.