真空紫外/过二硫酸盐去除饮用水中嗅味物质

Removal of Odorants in Drinking Water Using VUV/Persulfate

为解决饮用水嗅味问题,系统研究了真空紫外光(VUV)活化过二硫酸盐(PS)对典型致嗅物质2-甲基异莰醇(2-MIB)和土臭素(GSM)的去除效果及影响因素.结果表明,在PS浓度0.5 mmol·L^(-1)的条件下,PS难以去除2-MIB和GSM,VUV/PS联用工艺比VUV对2-MIB和GSM去除率分别提高76%和74%.VUV/PS联用工艺对致嗅物质的去除效果主要受PS浓度和VUV光强影响,在PS浓度0.25~2 mmol·L^(-1),VUV光强113.2~618.5μW·cm-2增加过程中,2-MIB的去除率分别增加42%和39%,GSM去除率分别增加34%和16%.p H值变化对2-MIB和GSM去除率的影响并不明显;HCO-3离子、腐殖酸的存在则导致2-MIB和GSM去除率的减小,减少程度随HCO-3离子、腐殖酸浓度的增大而增大.VUV/PS联用工艺可有效降解水中致嗅物质,降低后续水处理的难度.

In order to solve the odor problem of drinking water,the performance of a VUV/persulfate process and its influencing factors were investigated systematically for removing odors from 2-MIB and GSM. The results showed that it was difficult to remove 2-MIB and GSM using PS alone with a PS concentration of 0. 5 mmol·L-1,but the removal rates of 2-MIB and GSM by the VUV/PS process could be increased by 76% and 74%,respectively,compared with VUV alone. The performance of the VUV/PS process was mainly affected by the PS concentration and VUV intensity. When the PS concentration increased from 0. 25 to 2 mmol·L-1 and the VUV intensity increased from 113. 2 to 618. 5 μW·cm-2,the removal rate of 2-MIB was increased by 42% and 39%,respectively,and the removal rate of GSM was increased by 34% and 16%,respectively. The effect of p H on 2-MIB and GSM removal was not significant. The occurrence of HCO-3 and humic acid will decrease the removal rates of 2-MIB and GSM,and the degree of reduction increases with the concentrations of HCO-3 ion and humic acid. The VUV/PS process can effectively degrade the typical odorants in water and can reduce the difficulty of subsequent water treatment.