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Environmental Technology Volume 45, 2024 - Issue 11
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Enhanced 2-MIB degradation by UV-LED/chlorine process: reaction kinetics, wavelength dependence, influencing factors and degradation pathways

Zhen-Ning Luoa State Key Laboratory of Pollution Control and Resource Reuse, Key Laboratory of Yangtze Water Environment, Ministry of Education, College of Environmental Science and Engineering, Tongji University, Shanghai, People’s Republic of China;b Shanghai Institute of Pollution Control and Ecological Security, Shanghai, People’s Republic of ChinaView further author information
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Tian-Yang Zhanga State Key Laboratory of Pollution Control and Resource Reuse, Key Laboratory of Yangtze Water Environment, Ministry of Education, College of Environmental Science and Engineering, Tongji University, Shanghai, People’s Republic of China;b Shanghai Institute of Pollution Control and Ecological Security, Shanghai, People’s Republic of ChinaCorrespondence[email protected]
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Meng-Yuan Xua State Key Laboratory of Pollution Control and Resource Reuse, Key Laboratory of Yangtze Water Environment, Ministry of Education, College of Environmental Science and Engineering, Tongji University, Shanghai, People’s Republic of China;b Shanghai Institute of Pollution Control and Ecological Security, Shanghai, People’s Republic of ChinaView further author information
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Ruo-Fan Fanga State Key Laboratory of Pollution Control and Resource Reuse, Key Laboratory of Yangtze Water Environment, Ministry of Education, College of Environmental Science and Engineering, Tongji University, Shanghai, People’s Republic of China;b Shanghai Institute of Pollution Control and Ecological Security, Shanghai, People’s Republic of ChinaView further author information
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Xing-Xing Wanga State Key Laboratory of Pollution Control and Resource Reuse, Key Laboratory of Yangtze Water Environment, Ministry of Education, College of Environmental Science and Engineering, Tongji University, Shanghai, People’s Republic of China;b Shanghai Institute of Pollution Control and Ecological Security, Shanghai, People’s Republic of ChinaView further author information
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Zheng-Xiong Zhenga State Key Laboratory of Pollution Control and Resource Reuse, Key Laboratory of Yangtze Water Environment, Ministry of Education, College of Environmental Science and Engineering, Tongji University, Shanghai, People’s Republic of China;b Shanghai Institute of Pollution Control and Ecological Security, Shanghai, People’s Republic of ChinaView further author information
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Heng-Xuan Zhaoa State Key Laboratory of Pollution Control and Resource Reuse, Key Laboratory of Yangtze Water Environment, Ministry of Education, College of Environmental Science and Engineering, Tongji University, Shanghai, People’s Republic of China;b Shanghai Institute of Pollution Control and Ecological Security, Shanghai, People’s Republic of ChinaView further author information
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Zong-Chen Lia State Key Laboratory of Pollution Control and Resource Reuse, Key Laboratory of Yangtze Water Environment, Ministry of Education, College of Environmental Science and Engineering, Tongji University, Shanghai, People’s Republic of China;b Shanghai Institute of Pollution Control and Ecological Security, Shanghai, People’s Republic of ChinaView further author information
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Yu-Lin Tanga State Key Laboratory of Pollution Control and Resource Reuse, Key Laboratory of Yangtze Water Environment, Ministry of Education, College of Environmental Science and Engineering, Tongji University, Shanghai, People’s Republic of China;b Shanghai Institute of Pollution Control and Ecological Security, Shanghai, People’s Republic of ChinaView further author information
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Bin Xua State Key Laboratory of Pollution Control and Resource Reuse, Key Laboratory of Yangtze Water Environment, Ministry of Education, College of Environmental Science and Engineering, Tongji University, Shanghai, People’s Republic of China;b Shanghai Institute of Pollution Control and Ecological Security, Shanghai, People’s Republic of ChinaView further author information
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Pages 2132-2143 | Received 03 Sep 2022, Accepted 31 Dec 2022, Published online: 17 Jan 2023
 
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ABSTRACT

The efficient removal of 2-Methylisoborneol (2-MIB), a typical odour component, in water treatment plants (WTPs), poses a great challenge to conventional water treatment technology due to its chemical stability. In this study, the combination of ultraviolet light-emitting diode (UV-LED) and chlorine (UV-LED/chlorine) was exploited for 2-MIB removal, and the role of ultraviolet (UV) wavelength was investigated systematically. The results showed that UV or chlorination alone did not degrade 2-MIB effectively, and the UV/chlorine process could degrade 2-MIB efficiently, following the pseudo-first-order kinetic model. The 275 nm UV exhibited higher 2-MIB degradation efficiency in this UV-LED/chlorine system than 254 nm UV, 265 nm UV and 285 nm UV due to the highest mole adsorption coefficient and quantum yield of chlorine in 275 nm UV. ·OH and ·Cl produced in the 275 nm UV/chlorine system played major roles in 2-MIB degradation. HCO3− and Natural organic matter (NOM), prevalent in water, consumed ·OH and ·Cl, thus inhibiting the 2-MIB degradation by UV-LED/chlorine. In addition, NOM and 2-MIB could form a photonic competition effect. The degradation of 2-MIB by UV-LED/chlorine was done mainly through dehydration and demethylation, and odorous intermediates, such as camphor, were produced. 2-MIB was degraded through the α bond fracture and six-membered ring opening to form saturated or unsaturated hydrocarbons and aldehydes. Four DBPs, chloroform (CF), trichloroacetaldehyde (TCE), trichloroacetone (TCP) and dichloroacetone (DCP), were mainly generated, and CF was the most significant by-product.

GRAPHICAL ABSTRACT

Disclosure statement

No potential conflict of interest was reported by the author(s).

Data availability statement

Data are available on request from the authors.

Additional information

Funding

This work was supported by National Natural Science Foundation of China [grant numbers 51978483, 52070144]; National Key Research and Development Program [grant number 2021YFC3201303]; Shanghai Rising-Star Program: [grant number 22QC1400500].

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