ABSTRACT

Ozonation for micropollutant removal from wastewater treatment plant effluent is energy and cost-intensive because of competition between background organic matter and micropollutants. This study aims to elucidate the interference of different organic matter fractions during the ozonation of micropollutants. Wastewater treatment plant effluent was fractionated using membranes and XAD-8 resin. All membrane and resin fractions were spiked with 18 micropollutants (2 µg/L) and ozonated with 0.25, 0.5 and 1 g O₃/g TOC. Results show that these fractions differ in their interference with the ozonation of micropollutants. Interference was lower in the smallest size fraction (<1 kDa) than in all other fractions for micropollutants with low and medium ozone reactivity. The hydrophobic neutrals and hydrophilics resin factions showed a high interference for ozonation of micropollutants with medium and high ozone reactivity, respectively. The four parameters that were analyzed (specific UV absorbance at 254 nm, fluorescence, chemical oxygen demand and nitrite) could not elucidate the differences in micropollutant removal. Still, we conclude that understanding the type of organic matter present in the matrix, is essential to optimize micropollutant ozonation and other tertiary micropollutant removal treatments.

摘要

由于背景有机物和微污染物之间的竞争，从废水处理厂流出物中去除微污染物的臭氧化是能源和成本密集型的​​。本研究旨在阐明微污染物臭氧化过程中不同有机物组分的干扰。废水处理厂流出物使用膜和 XAD-8 树脂进行分馏。所有膜和树脂组分都加入了 18 种微污染物 (2 µg/L)，并用 0.25、0.5 和 1 g O ₃臭氧化/g 总有机碳。结果表明，这些组分对微污染物臭氧化的干扰不同。对于具有中低臭氧反应性的微污染物，最小尺寸部分 (<1 kDa) 的干扰低于所有其他部分。疏水性中性和亲水性树脂组分分别对具有中等和高臭氧反应性的微污染物的臭氧化显示出高干扰。分析的四个参数（254 nm 处的特定紫外吸光度、荧光、化学需氧量和亚硝酸盐）无法阐明微污染物去除的差异。尽管如此，我们仍然得出结论，了解基质中存在的有机物类型对于优化微污染物臭氧化和其他三级微污染物去除处理至关重要。