期刊
ENVIRONMENTAL SCIENCE & TECHNOLOGY
卷 55, 期 16, 页码 11294-11307出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.est.1c02584
关键词
dissolved organic matter transformation; wastewater treatment; sludge microbe
资金
- Jiangsu Natural Science Foundation of China [BK20180010, BE2020686]
- National Science Foundation of China [51978327, 21677071]
- National Water Pollution Control and Governance of Science and Technology Major Special [2017ZX07202003]
Microbe-mediated DOM transformation during wastewater treatment significantly increases DOM's aromaticity and unsaturation, diversifying DOM richness and generating nitrogenous and sulfur-containing compounds through oxidoreduction, functional group transfer, and bond formation. Network analysis shows microbial division of labor in DOM transformation with hub microbes correlated to liable DOM consumption and recalcitrant compound transformation, while peripheral degraders may feed on hub microbe metabolites. Developing technologies to selectively enrich peripheral degraders may advance DOM removal by decoupling liable and recalcitrant DOM transformation processes.
Understanding the degradation of dissolved organic matter (DOM) is vital for optimizing DOM control. However, the microbe-mediated DOM transformation during wastewater treatment remains poorly characterized. Here, microbes and DOM along full-scale biotreatment processes were simultaneously characterized using comparative genomics and high-resolution mass spectrometry-based reactomics. Biotreatments significantly increased DOM's aromaticity and unsaturation due to the overproduced lignin and polyphenol analogs. DOM was diversified by over five times in richness, with thousands of nitrogenous and sulfur-containing compounds generated through microbe-mediated oxidoreduction, functional group transfer, and C-N and C-S bond formation. Network analysis demonstrated microbial division of labor in DOM transformation. However, their roles were determined by their functional traits rather than taxa. Specifically, network and module hubs exhibited rapid growth potentials and broad substrate affinities but were deficient in xenobiotics- metabolism-associated genes. They were mainly correlated to liable DOM consumption and its transformation to recalcitrant compounds. In contrast, connectors and peripherals were potential degraders of recalcitrant DOM but slow in growth. They showed specialized associations with fewer DOM molecules and probably fed on metabolites of hub microbes. Thus, developing technologies (e.g., carriers) to selectively enrich peripheral degraders and consequently decouple the liable and recalcitrant DOM transformation processes may advance DOM removal.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据