Functional group specific reactivity, transformation and persistence of CECs and EfOM during wastewater ozonation

废水臭氧化过程中 CEC 和 EfOM 的官能团特定反应性、转化和持久性

• 批准号: 428639365
• 负责人: Dr.-Ing. Uwe Hübner
• 金额: --
• 依托单位: Xylem Services GmbH
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2019
• 资助国家: 德国
• 起止时间: 2018-12-31 至 2023-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/428639365?language=en
• 关键词: Functional; group; specific; reactivity; transformation

Chemical oxidation by ozone is an established technology for the efficient oxidation of contaminants of emerging concern (CEC) in water treatment. A major disadvantage of using ozone is the formation of stable and potentially toxic ozonation products (OPs). Biologically stable OPs are particularly critical due to their longevity in the environment. It is impossible to examine all relevant CECs for their reactivity towards ozone, the resulting OPs and their biological stability. Rather, it is necessary to generate knowledge based on the systematic study of functional groups that can be transferred to other substances. So far, such systematic studies have not been carried out. The knowledge gap for effluent organic matter (EfOM) is even larger. The ozone consumption of EfOM proves its reactivity to ozone, but which functional groups react, which products are formed and how biologically stable they are, has not been investigated for EfOM especially with heteroatoms (N, S).This project aims to fill both gaps by a complementary analytical and experimental approach, with the common methodological approach of introducing a label into the OPs by using 18O-ozone and the subsequent detection and identification of the OPs by means of (ultra-high-resolution) mass spectrometry.The project is based on the central hypothesis that the reaction of ozone with certain functional groups of CECs as well as with equivalent functional groups of the EfOM leads to a predictable formation of OPs. It aims to i) improve our understanding of the reactivity of different functional groups to ozone, focusing on the identification of non-biodegradable functional groups within the OPs, ii) identify and quantify ozone-reactive functional groups in the EfOM based on existing knowledge on the transformation of CECs, with the focus on N- and S-containing functional groups which form potentially chemically stable OPs, and iii) assess the significance of the EfOM with respect to the formation of biologically stable OPs in wastewater ozonation in comparison to CECs.To that end, the biological degradation of the OPs will be investigated using their specific functional groups in column degradation experiments and managed aquifer recharge studies. With the new labeling approach, we are able to reliably detect CEC and EfOM OPs, identify them and track their stability in biological systems.The project generates a systematic and transferable understanding of the formation of stable OPs based on functional groups of organic molecules, both of CECs and EfOM. Only when the stability of the possible OPs has been investigated a systematic toxicological evaluation of ozonation as a water treatment method will become feasible.

臭氧化学氧化是一种有效氧化水处理中新兴关注污染物（CEC）的成熟技术。使用臭氧的一个主要缺点是形成稳定和潜在有毒的臭氧化产物（OP）。生物稳定的有机磷由于其在环境中的寿命而特别重要。不可能检查所有相关CEC对臭氧的反应性、产生的OP及其生物稳定性。相反，有必要在系统研究可转移到其他物质的官能团的基础上产生知识。迄今为止，尚未进行此类系统的研究。对流出物有机物（EfOM）的知识差距甚至更大。EfOM的臭氧消耗证明了其对臭氧的反应性，但是对于EfOM，特别是具有杂原子（N，S）的EfOM，还没有研究哪些官能团反应，形成哪些产物以及它们的生物稳定性如何。本项目旨在通过互补的分析和实验方法来填补这两个空白，通过使用18 O-臭氧将标签引入OP中的常见方法，以及随后通过以下方式检测和鉴定OP该项目基于一个核心假设，即臭氧与CEC的某些官能团以及与EfOM的等效官能团的反应导致可预测的OP形成。其目的是：i）提高我们对不同官能团对臭氧的反应性的理解，重点是确定OP中不可生物降解的官能团，ii）根据现有的CEC转化知识，确定和量化EfOM中的臭氧反应性官能团，重点是形成潜在化学稳定OP的含N和S官能团，和iii）与CEC相比，评估EfOM在废水臭氧化中形成生物稳定OP方面的重要性。为此，将在柱降解实验和管理含水层补给研究中使用其特定功能团来研究OP的生物降解。通过新的标记方法，我们能够可靠地检测CEC和EfOM OP，识别它们并跟踪它们在生物系统中的稳定性。该项目基于CEC和EfOM有机分子的官能团，对稳定OP的形成产生了系统和可转移的理解。只有当可能的有机磷的稳定性进行了调查，系统的毒理学评价臭氧作为一种水处理方法将成为可行的。