超声活化过硫酸盐降解水中典型嗅味

为有效解决饮用水嗅味污染问题，选取水中典型致嗅物质二甲基异莰醇（2-MIB）和土臭素（GSM）作为目标污染物，系统研究了超声（US）活化过硫酸盐（PS）高级氧化技术对两种致嗅物质的降解规律及其影响因素.结果表明，在15 min内超声/过硫酸盐联用工艺能有效去除水中典型嗅味，与单独超声处理相比，2-MIB和GSM的去除率分别可提高57.0%和63.6%；2-MIB与GSM浓度在100~800 ng·L^-1范围内US/PS联用工艺均有较高的去除率，且在100 ng·L^-1时降解效果最佳，去除率分别可达88.7%和93.3%；典型致嗅物质的降解速率随PS浓度（0.25~2mmol·L^-1）和US声强（0.33~0.53 W·cm^-2）的增加而加快；水体中腐殖酸存在会竞争消耗自由基使嗅味降解受到抑制但影响效果不显著；在反应体系中分别加入甲醇与叔丁醇（自由基清除剂）后，2-MIB与GSM去除率明显下降，且甲醇对嗅味降解抑制程度强于叔丁醇，表明US/PS高级氧化技术对嗅味快速的降解主要是硫酸根自由基与羟基自由基共同作用的结果.

Ultrasonically Activated Persulfate Degrades Typical Odors in Water

In order to solve the problem of odor pollution in drinking water effectively, the typical odorants 2-methylisoborneol (2-MIB) and Geosmin (GSM) were selected as target pollutants. The degradation effect and factors influencing these two typical odors by ultrasonically (US) activated persulfate (PS) advanced oxidation technology were systematically investigated in this work. When the sample was treated for 15 min, the application of US/PS combination technology increased the removal rates of 2-MIB and GSM by 57.0% and 63.6%, respectively, compared with sonication alone. Furthermore, the optimum removal rates of 2-MIB and GSM were 88.7% and 93.3% when the 2-MIB and GSM concentrations were 100 ng·L^-1. Moreover, the degradation rates of 2-MIB and GSM increased with increasing PS concentration (from 0.25 mmol·L^-1 to 2 mmol·L^-1) and US intensity (from 0.33 W·cm^-2 to 0.53 W·cm^-2). The presence of humic acid competes to consume free radicals to inhibit the degradation of odor. The addition of the radical scavengers methanol and tert-butanol can reduce the removal rates of 2-MIB and GSM. The presence of methanol had a stronger inhibition effect on odor degradation than tert-butanol, indicating that the odor removal was mainly caused by sulfate radicals and hydroxyl radicals in the combination US/PS technology.