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Simultaneous mitigation of disinfection by-product formation and odor compounds by peroxide/Fe(II)-based process: Combination of oxidation and coagulation
Water Research ( IF 12.8 ) Pub Date : 2021-06-04 , DOI: 10.1016/j.watres.2021.117327
Xiaoyu Liu 1 , Shunke Ding 1 , Pin Wang 1 , Yuntao Hong 1 , Hongying Zhao 2 , Wenhai Chu 1
Affiliation  

To remove disinfection by-product (DBP) precursors and mitigate odor compounds, peroxide (peroxymonosulfate and persulfate)/Fe(II)-based process was applied as a combination of coagulation and oxidation. Compared with traditional Fe-based salt coagulation (FeSO4 and FeCl3), peroxide/Fe(II)-based process was more efficient in dissolved organic carbon, UV254 and turbidity removal, and peroxymonosulfate showed better performance than persulfate. The better coagulation performance arose from a combination of enhanced neutralization and different characteristics of flocs. Even though the combined process would increase the bromine substitution factor of DBPs, DBP formation and DBP-associated toxicity after peroxide/Fe(II)-based process were 9.2–38.8% and 5.2–27.2% lower than that after conventional Fe(III) coagulation. Both enhanced dissolved organic matter removal and oxidation of DBP precursors played vital roles in DBP control. Conventional Fe-based salt coagulation could hardly remove odor compounds (less than 10%, generally), whereas 28.2–84.9% of odor compounds were degraded during peroxide/Fe(II)-based process, due to free radical formation. This study demonstrated that PMS/Fe(II)-based process might be a promising treatment process for simultaneous DBP control and odor removal in source water.



中文翻译:

通过基于过氧化物/Fe(II) 的工艺同时减轻消毒副产物的形成和气味化合物:氧化和凝结的结合

为了去除消毒副产物 (DBP) 前体并减轻气味化合物,应用了基于过氧化物(过氧化单硫酸盐和过硫酸盐)/Fe(II) 的工艺作为混凝和氧化的组合。与传统的 Fe 基盐凝聚法(FeSO 4和 FeCl 3)相比,过氧化物/Fe(II) 基工艺在溶解有机碳、UV 254 方面更有效和去除浊度,并且过硫酸盐表现出比过硫酸盐更好的性能。更好的混凝性能源于增强的中和和絮凝物的不同特性的结合。尽管联合工艺会增加 DBPs 的溴取代因子,但过氧化物/Fe(II) 基工艺后 DBP 形成和 DBP 相关毒性比常规 Fe(III) 工艺低 9.2-38.8% 和 5.2-27.2%凝固。增强溶解的有机物去除和 DBP 前体的氧化在 DBP 控制中起着至关重要的作用。传统的铁基盐凝聚很难去除异味化合物(一般小于 10%),而 28.2-84.9% 的异味化合物在过氧化物/Fe(II) 基过程中由于自由基的形成而降解。

更新日期:2021-06-16
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