Degradation of 2-methylisoborneol in water by hydroxyl radical
CHENG Jian-guo1, BAI Min-dong2, YU Yi-xuan1, TIAN Yi-ping1, ZHANG Zhi-tao1
1. Environmental Engineering Institute, Marine engineering college, Dalian Maritime University, Dalian 116026, China;
2. Collaborative Innovation Center for Exploitation and Utilization of Marine Biological Resources, College of Environment and Ecology, Xiamen University, Xiamen 361102, China
2-methylisoborneol (2-MIB) produced by cyanobacteria and actinomycetes is a saturated bicyclic-tertiary alcohol, which can cause earthy/musty taste and odor in surface water. Moreover, 2-MIB is usually difficult to be decomposed and removed by conventional water treatment process. In this paper, hydroxyl radical (·OH) generated by a strong ionization discharge process at atmosphere pressure was used to degrade 2-MIB in water, of which the removal efficiency including dose effects and contact reaction time were investigated. The intermediate products formed in ·OH treatment process were analyzed by GC-MS, and the oxidative degradation mechanism of 2-MIB by ·OH was discussed. Results show that the removal rate for 2-MIB with initial concentration of 150and 300ng/L could reach 96% and 97.6% within 6.0s, while the total reactive oxidant (TRO) dose were 1.8and 2.3mg/L, respectively. After ·OH treatment, the concentration of 2-MIB in water was lower than 10ng/L (lower than the human olfactory threshold). The degradation effects of 2-MIB were obviously reduced by the ·OH scavengers tertiary butyl alcohol (TBA), indicating that ·OH should be the main oxidant for 2-MIB oxidative degradation. By analyzing the intermediates produced in the oxidative degradation process, it was found that the bridge ring structures of 2-MIB could be destroyed by ·OH and finally mineralized to CO2 and H2O.
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