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Processes 2019, 7(2), 95; https://doi.org/10.3390/pr7020095

Degradation of Aqueous Polycyclic Musk Tonalide by Ultraviolet-Activated Free Chlorine

1,*
and
2,3,*
1
Environmental Engineering, Jiyang College of Zhejiang A & F University, Zhuji 311800, China
2
Institute of Water Resources & Ocean Engineering, Ocean College, Zhejiang University, Hangzhou 310058, China
3
Institute of Municipal Engineering, College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China
*
Authors to whom correspondence should be addressed.
Received: 6 December 2018 / Revised: 31 January 2019 / Accepted: 7 February 2019 / Published: 14 February 2019
(This article belongs to the Special Issue Application of Advanced Oxidation Processes)
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Abstract

Chlorine-incorporating ultraviolet (UV) provides a multiple barrier for drinking water disinfection. Meanwhile, post-UV employment can promote the degradation of micropollutants by radical production from chlorine residual photolysis. This work studied the degradation of one such chemical, tonalide (AHTN), by low-pressure UV-activated free chlorine (FC) under typical UV disinfection dosage of <200 mJ·cm−2 and water matrix of filtered tank effluent. AHTN was rapidly degraded by UV/FC in accordance with pseudo-first-order kinetics. The reaction rate constants of AHTN with reactive chlorine species and hydroxyl radical (HO•) were estimated. Mechanistic exploration evidenced that under UV/FC, AHTN degradation was attributable to direct photolysis, ClO•, and HO•. The carbonyl side chain of AHTN served as an important attack site for radicals. Water matrices, such as natural organic matter (NOM), HCO 3 , Cu 2 + , PO 4 3 , and Fe 2 + , showed noticeable influence on the UV/FC process with an order of NOM > HCO 3 > Cu 2 + > PO 4 3 > Fe 2 + . Reaction product analysis showed ignorable formation of chlorinated intermediates and disinfection byproducts. View Full-Text
Keywords: polycyclic musks; degradation mechanism; UV/chlorine advanced oxidation process; water treatment polycyclic musks; degradation mechanism; UV/chlorine advanced oxidation process; water treatment
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Wang, L.; Liu, X. Degradation of Aqueous Polycyclic Musk Tonalide by Ultraviolet-Activated Free Chlorine. Processes 2019, 7, 95.

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