Removal of Odorants in Drinking Water Using VUV/Persulfate

Abstract

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 pH on 2-MIB and GSM removal was not significant. The occurrence of HCO3- and humic acid will decrease the removal rates of 2-MIB and GSM, and the degree of reduction increases with the concentrations of HCO3- 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.