UV工艺降解阿特拉津机理及对DBPFP的影响规律

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Abstract The degradation kinetics and mechanisms of atrazine (ATZ) in aqueous solution by various UV photooxidation processes, as well as its influence on chlorine demand and disinfection by-product formation potential (DBPFP) in the subsequent chlorination process were systematically investigated. The results showed that the degradation of ATZ in different photooxidation processes followed the pseudo-first-order reaction kinetics. In comparison with low removal efficiency of ATZ by UV irradiation alone, the UV/H₂O₂ process had much higher removal efficiency, and it first increases and then decreases with increasing H₂O₂ concentration. In UV/TiO₂ process, the degradation of ATZ was directly related to the production of oxidizing active species (ROS) such as holes, ·OH and ·O₂^-. In UV/H₂O₂/TiO₂ process, the degradation rate of ATZ was found higher than that in the UV/TiO₂ process. After UV pretreatment and the following chlorination, five disinfection by-products (DBPs) were detected in ATZ aqueous solution. Among of them, chloroform (TCM) and trichloroacetone (TCP) were the major chlorinated DBPs. The present study showed that the degradation of ATZ followed different degradation pathways in different UV photooxidation pretreatment processes, which would significantly affect the disinfection by-product formation potential (DBPPF) of ATZ solution in the following chlorination process.

Key words： atrazine advanced oxidation process chlorination disinfection by-products degradation mechanism

Received: 19 February 2021

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X703

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	Articles by authors
	LIU Yu-can
	WANG Ying
	WANG Yu-xia
	ZHU Yu-liang
	JI Xian-guo
	ZHANG Yan
	DUAN Jin-ming
	LI Wei

Cite this article:

LIU Yu-can,WANG Ying,WANG Yu-xia等. Ultraviolet photooxidation of atrazine and its effect on disinfection by-product formation potential[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(10): 4606-4615.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I10/4606

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