Revisiting Ferrate(VI) Activation: Why Enhanced Reactivity Undermines Disinfection

IF 8.8 2区 环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL
Zepei Tang,  and , Yang Deng*, 
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Abstract

Activated ferrate(VI) can enhance the degradation of contaminants of emerging concern (CECs) due to the in situ formation of more reactive intermediates, primarily Fe(V)/Fe(IV) and possibly free radicals. However, disinfection under ferrate(VI) activation conditions remains underexplored. This study investigated the role of sulfite (SO32–) in SO32–-activated ferrate(VI) for bacterial inactivation. Laboratory-scale experiments were conducted to degrade sulfamethoxazole (SMX) and remove bacterial indicators using ferrate(VI) alone and with sulfite at varying [Fe(VI)]:[SO32–]. Bacterial adsorption onto ferrate(VI)-derived iron oxide particles was experimentally ruled out, validating the dominance of chemical oxidation in bacterial removal. In lake water, activation was observed at [Fe(VI)]:[ SO32–] = 1:2, achieving 60% SMX degradation, compared to 42% by ferrate(VI) alone ([SMX] = 0.8 μM, [Fe(VI)] = 25 μM). However, log removals of total coliform and E. coli declined from 2.86 and 3.28 (ferrate(VI) alone) to 1.17–2.76 and 2.11–3.11, respectively, within [Fe(VI)]:[SO32–] = 4:1–1:4. Similar trends were also observed in the secondary wastewater effluent. Furthermore, log removals exhibited two-phase linear relationships with ferrate(VI) exposure, regardless of activation state, underscoring the importance of time-integrated ferrate(VI) concentration. This study demonstrates the limitations of CT values in assessing ferrate(VI) activation-based disinfection and highlights the need to re-evaluate implementation strategies for ferrate(VI) activation in water treatment.

重述高铁酸盐(VI)活化:为什么增强反应性会破坏消毒
活化高铁酸盐(VI)可以增强对新兴关注污染物(CECs)的降解,因为在原位形成了更多的活性中间体,主要是Fe(V)/Fe(IV)和可能的自由基。然而,高铁酸盐(VI)激活条件下的消毒仍未得到充分探索。本研究探讨了亚硫酸盐(SO32 -)在SO32 -活化高铁酸盐(VI)中灭活细菌的作用。在不同的[Fe(VI)]:[SO32 -]条件下,分别使用高铁酸盐(VI)和亚硫酸盐对磺胺甲恶唑(SMX)进行了降解和去除细菌指标的实验。高铁酸盐(VI)衍生的氧化铁颗粒上的细菌吸附被实验排除,验证了化学氧化在细菌去除中的优势。在湖水中,在[Fe(VI)]:[SO32 -] = 1:2的活化条件下,SMX的降解率达到60%,而高铁酸盐(VI)单独([SMX] = 0.8 μM, [Fe(VI)] = 25 μM)的降解率为42%。在[Fe(VI)]:[SO32 -] = 4:1-1:4范围内,总大肠菌群和大肠杆菌的log去除率分别从2.86和3.28(仅高铁酸盐(VI))下降到1.17-2.76和2.11-3.11。在二级废水出水中也观察到类似的趋势。此外,测井去除与高铁酸盐(VI)暴露表现出两相线性关系,无论激活状态如何,都强调了时间积分高铁酸盐(VI)浓度的重要性。本研究证明了CT值在评估基于高铁酸盐(VI)激活的消毒中的局限性,并强调了重新评估水处理中高铁酸盐(VI)激活的实施策略的必要性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Environmental Science & Technology Letters Environ.
Environmental Science & Technology Letters Environ. ENGINEERING, ENVIRONMENTALENVIRONMENTAL SC-ENVIRONMENTAL SCIENCES
CiteScore
17.90
自引率
3.70%
发文量
163
期刊介绍: Environmental Science & Technology Letters serves as an international forum for brief communications on experimental or theoretical results of exceptional timeliness in all aspects of environmental science, both pure and applied. Published as soon as accepted, these communications are summarized in monthly issues. Additionally, the journal features short reviews on emerging topics in environmental science and technology.
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