DOM 的预臭氧化对基于 UV 的高级氧化工艺去除微污染物的影响。
Influence of pre-ozonation of DOM on micropollutant abatement by UV-based advanced oxidation processes.
机构信息
Department of Civil and Environmental Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong; Institute for Advanced Study, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong.
Department of Civil and Environmental Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong.
出版信息
J Hazard Mater. 2020 Jun 5;391:122201. doi: 10.1016/j.jhazmat.2020.122201. Epub 2020 Feb 8.
Dissolved organic matter (DOM), ubiquitously co-present in micropollutant-impaired water, significantly decreases micropollutant removal in UV-based AOPs through consuming radicals and filtering UV light. In this study, pre-ozonation was proposed to alleviate the negative effects of DOM on UV-based AOPs. After ozone treatment of DOM-containing water at ozone dosages of 0.1-1 mg O/mg DOC, the degradation rate of benzoic acid (BA) in UV/HO process increased by 7-34% mainly due to the enhanced transmission of UV light. The degradation rate of BA in UV/SO process varied from -11% to 25% at ozone dosages of 0.1-1 mg O/mg DOC because of the increased photolysis rate of SO and the altered reactivity of DOM towards SO. Pre-ozonation of DOM at ozone dosage of 1 mg O/mg DOC enhanced the oxidation rate of BA in UV/chlorine process by 35% due to the increased rate of chlorine photolysis and the decreased reactivity of DOM towards Cl. The influence of pre-ozonation on the formation potential of disinfection by-products (DBPs) depends on the kind of AOPs and the species of DBPs. The energy cost analysis suggests that pre-ozonation of DOM is an economic process for enhancing pollutant abatement by UV-based AOPs.
溶解有机物（DOM）普遍存在于受微污染物污染的水中，通过消耗自由基和过滤紫外线，显著降低了基于 UV 的 AOP 对微污染物的去除效果。本研究提出了预臭氧化来减轻 DOM 对基于 UV 的 AOP 的负面影响。在 0.1-1mgO/mgDOC 的臭氧剂量下对含 DOM 的水进行臭氧处理后，UV/HO 工艺中苯甲酸（BA）的降解速率提高了 7-34%，主要是由于紫外线光的透射增强。由于 SO 的光解速率增加和 DOM 对 SO 的反应性改变，在 0.1-1mgO/mgDOC 的臭氧剂量下，BA 在 UV/SO 工艺中的降解速率从-11%变化到 25%。在 1mgO/mgDOC 的臭氧剂量下预臭氧化 DOM 可使 UV/氯气工艺中 BA 的氧化速率提高 35%，这是由于氯光解速率增加和 DOM 对 Cl 的反应性降低所致。预臭氧化对消毒副产物（DBPs）形成潜力的影响取决于 AOPs 的种类和 DBPs 的种类。能量成本分析表明，预臭氧化 DOM 是一种经济的过程，可增强基于 UV 的 AOP 对污染物的去除效果。
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