《Water Research》杂志刊登“降解农药四聚乙醛UV/H₂O₂和UV/TiO₂的两个深度氧化过程中有机质背景和碱性的影响”

作者：Olivier Autin, Julie Hart, Peter Jarvis, JitkaMacAdam, Simon A. Parsons, Bruce Jefferson

刊物：《Water Research》，2013年，47卷第6期，2041-2049页

关键词：四聚乙醛；天然有机质；碱性；清除；二氧化钛；过氧化氢

摘要：本文对采用UV/H₂O₂和UV/TiO₂降解微量污染物的两个深度氧化过程中背景成分的影响进行了研究。实验结果表明：并非微量污染物浓度，而是背景污染物清除速率控制着所需的UV照射剂量。水源保持不变时，有机质性质对清除速率有一定限制影响，然而，保障达到要求微量污染物浓度时，周期性渗漏的疏水材料可能大幅度提高所需的最低UV剂量。此外，高浓度有机质背景不仅没有促进UV/TiO₂进行清除，反而浸透在TiO₂表面。由于大型TiO₂骨料的特殊构成，碱性抑制了UV/TiO₂光催化作用效率。本研究同时表明，在背景有机质和碱性与应用工程条件相符的情况下，处理测试中使用人工合成水是可接受的。最后，背景成分具有大于85%的总清除速率时，更高浓度的清除微量污染物并不改变发现的意义。

The impact of background organic matter and alkalinity on the degradation of the pesticide metaldehyde by two advanced oxidation processes: UV/H₂O₂ and UV/TiO₂

Authors: Olivier Autin, Julie Hart, Peter Jarvis, JitkaMacAdam, Simon A. Parsons, Bruce Jefferson

Journal: Water Research, Volume 47, Number 6 (2013), 2041-2049

Key words:Metaldehyde; Natural organic matter; Alkalinity; Scavenging; Titanium dioxide; Hydrogen peroxide

Abstract:The impact of background constituents on the degradation of trace levels of micropollutants by two advanced oxidation processes: UV/H₂O₂ and UV/TiO₂ was studied.Experimental results demonstrated that the background scavenging rate rather than the concentration of micropollutant controls the required UV irradiation dose.The character of the natural organic matter had a limited impact on scavenging when the water source remains unchanged,however, a periodic bleed of hydrophobic material may substantially increase the minimum UV dose required to reach the desired micropollutant concentration. Moreover, in the case of UV/TiO₂, high concentrations of background organic matter do not only act as scavengers but also saturate the TiO₂ surface.Alkalinity inhibits the efficacy of UV/TiO₂photocatalysis due to the formation of large TiO₂ aggregates.The study also demonstrated that the use of synthetic waters for treatability test purposes was an acceptable approach as long as both the background organic matter and the alkalinity were matched to that of the projected application.Finally spiking micropollutants at higher concentrations does not alter the significance of the findings as long as the background constituents represent more than 85% of the total scavenging rate.

原文链接：http://www.sciencedirect.com/science/article/pii/S0043135413000390

翻译：孙瑞刚；审核：王庆明