Importance of Chain Length in Propagation Reaction on •OH Formation during Ozonation of Wastewater Effluent

臭氧 流出物 化学 激进的 产量(工程) 废水 连锁反应 链式传播 丁醇 基质(化学分析) 环境化学 色谱法 乙醇 有机化学 环境工程 光化学 聚合物 材料科学 工程类 冶金 单体
作者
Jinru Zou,Yongze Liu,Han Qi,Yajun Tian,Fang‐Fang Shen,Longfei Kang,Li Feng,Jun Ma,Liqiu Zhang,Ziwen Du
出处
期刊:Environmental Science & Technology [American Chemical Society]
卷期号:57 (47): 18811-18824 被引量:8
标识
DOI:10.1021/acs.est.3c00827
摘要

During the ozonation of wastewater, hydroxyl radicals (•OH) induced by the reactions of ozone (O3) with effluent organic matters (EfOMs) play an essential role in degrading ozone-refractory micropollutants. The •OH yield provides the absolute •OH formation during ozonation. However, the conventional "tert-Butanol (t-BuOH) assay" cannot accurately determine the •OH yield since the propagation reactions are inhibited, and there have been few studies on •OH production induced by EfOM fractions during ozonation. Alternatively, a "competitive method", which added trace amounts of the •OH probe compound to compete with the water matrix and took initiation reactions and propagation reactions into account, was used to determine the actual •OH yields (Φ) compared with that obtained by the "t-BuOH assay" (φ). The Φ were significantly higher than φ, indicating that the propagation reactions played important roles in •OH formation. The chain propagation reactions facilitation of EfOMs and fractions can be expressed by the chain length (n). The study found significant differences in Φ for EfOMs and fractions, precisely because they have different n. The actual •OH yield can be calculated by n and φ as Φ = φ (1 + n)/(nφ + 1), which can be used to accurately predict the removal of micropollutants during ozonation of wastewater.
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