Chair of Urban Water Systems Engineering , Technical University of Munich , Am Coulombwall 3 , 85748 Garching , Germany.
Research Unit Analytical BioGeoChemistry , Helmholtz Zentrum München , Ingolstädter Landstrasse 1 , 85764 Neuherberg , Germany.
Environ Sci Technol. 2018 Dec 18;52(24):14342-14351. doi: 10.1021/acs.est.8b04559. Epub 2018 Nov 26.
It is widely assumed that biodegradation of trace organic chemicals (TOrCs) in managed aquifer recharge (MAR) systems occurs via a cometabolic transformation with dissolved organic carbon serving as primary substrate. Hence, the composition facilitating bioavailability of the organic matter seems to have a great impact on TOrCs transformation in MAR systems. The aim of this study was to elucidate the character of effluent organic matter present in the feedwater of a simulated sequential MAR system throughout the infiltration by use of FT-ICR-MS analyses as well as spectroscopic methods. Furthermore, compositional changes were correlated with TOrCs targeted throughout the system as well as the abundance of different microbial phyla. On the basis of their behavior throughout the infiltration system in which different redox and substrate conditions prevailed, TOrCs were classified in four groups: easily degradable, redox insensitive, redox sensitive, and persistent. Masses correlating with persistent TOrCs were mainly comprised of CHNO-containing molecules but also of CHO which are known as carboxyl-rich alicyclic molecules, while CHOS and CHNOS can be neglected. Easily degradable TOrCs could be associated with CHNO-, CHO-, and CHOS-containing compounds. However, a shift of molecular compounds to mostly CHOS was observed for redox-insensitive TOrCs. Three hundred thirty eight masses correlated with removal of redox-sensitive TOrCs, but no distinct clustering was identified.
人们普遍认为，管理含水层补给（MAR）系统中痕量有机化学品（TOrCs）的生物降解是通过共代谢转化进行的，其中溶解有机碳作为主要基质。因此，有利于有机物生物利用度的组成似乎对 MAR 系统中 TOrCs 的转化有很大的影响。本研究的目的是通过使用傅里叶变换离子回旋共振质谱（FT-ICR-MS）分析以及光谱方法，阐明模拟顺序 MAR 系统给水中在渗透过程中存在的出水有机物的特征。此外，还将组成变化与整个系统中靶向的 TOrCs 以及不同微生物门的丰度进行了相关性分析。基于它们在渗透系统中的行为，该系统中存在不同的氧化还原和基质条件，将 TOrCs 分为四类：易降解、氧化还原不敏感、氧化还原敏感和持久。与持久性 TOrCs 相关的质量主要由含有 CHNO 的分子组成，但也含有已知的富含羧基的脂环族分子的 CHO，而 CHOS 和 CHNOS 可以忽略不计。易降解的 TOrCs 可与含有 CHNO-、CHO-和 CHOS 的化合物相关联。然而，对于氧化还原不敏感的 TOrCs，观察到分子化合物向主要含有 CHOS 的化合物转移。有 338 个质量与去除氧化还原敏感的 TOrCs 相关，但未识别出明显的聚类。
