YUZhe-fan,ZHANGKe-jia,MAORu-yin,et al.Mechanism and Influencing Factors of 2-MIB Degradation by Micro?nano Nubbles Combined with PMS[J].China Water & Wastewater,2025,41(15):31-38.
Mechanism and Influencing Factors of 2-MIB Degradation by Micro?nano Nubbles Combined with PMS
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第41卷
Number:
第15期
Page:
31-38
Column:
Date of publication:
2025-08-01
- Keywords:
- drinking water odor; micro-nano bubble; persulfate; 2-methylisoborneol
- Abstract:
- 2-methylisoborneol (2-MIB) is a representative odorant in drinking water. The study investigated the kinetics and degradation mechanisms of 2-MIB using a micro-nano bubble combined with a peroxymonosulfate system (MNBs-PMS). The effects of various parameters, such as PMS dosage, gas source, gas flow rate, and pH, on the degradation of 2-MIB were examined. The results showed that the extreme high temperature and pressure generated during MNBs rupture could better activate PMS. Under the same conditions, the removal efficiency of the combined system was 3-5 times greater than that of PMS or MNBs alone, with reaction rates achieving 4-6 times, highlighting a significant synergistic effect. The removal efficiency positively correlated with PMS dosage and gas flow rate. When the PMS dosage increased from 0.5 mmol/L to 5 mmol/L, the reaction rate constant increased from 0.005 0 min-1 to 0.011 2 min-1. The experimental group with a gas flow rate of 50 mL/min showed a 40% improvement in removal efficiency compared to the group with a flow rate of 10 mL/min, with optimal efficiency achieved at pH 9 within a range of 3 to 9. Using oxygen as the gas source inproved dissolved oxygen levels in the water. The presence of natural inorganic anions and humic substances influenced degradation, with the effects varying based on their type and concentration. Quenching experiments identified hydroxyl radicals (·OH) and sulfate radicals (·SO4-) as the primary active species responsible for the degradation of 2-MIB. Additionally, the study explored the intermediate products formed during the degradation of 2-MIB in the MNBs-PMS system and proposed possible degradation pathways.
Last Update:
2025-08-01