Algae-driven bacterial production of extracellular reactive oxygen species for emerging contaminants degradation

IF 8.2 1区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Science of the Total Environment Pub Date : 2025-05-17 DOI:10.1016/j.scitotenv.2025.179670

Xi Wang , Rong Ni , Lusen Li , Hongwei Yu , Jing Qi , Baiwen Ma , Chengzhi Hu , Jiuhui Qu

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引用次数: 0

Abstract

Emerging contaminants (ECs) are ubiquitous in natural surface waters, posing significant risks to aquatic ecosystems and human health. Symbiotic systems comprising photoautotrophic algae and associated bacteria offer a promising approach for the bioremediation of aquatic environments. This study investigated the degradation of five ECs (carbamazepine, diclofenac, atenolol, sulfamethoxazole, and ofloxacin) by reactive oxygen species (ROS) generated through algal-bacterial interactions. The algal-bacterial system exhibited superior degradation efficiencies, achieving 96 %, 97 %, 89 %, 72 %, and 77 % removal for the respective ECs after 6 days, far surpassing the performance of pure bacterial or algal systems. Elevated levels of biogenic ROS were observed in the algal-bacterial system, with extracellular superoxide radicals (O₂^•−) and hydrogen peroxide (H₂O₂) identified as key drivers of the degradation process. Under ECs stress, the algal-bacterial system maintained cellular integrity and metabolic activity by upregulating pathways related to carbohydrate, lipid, amino acid, and nucleotide metabolism, thereby enhancing its resistance. These findings highlight the significant potential of algal-bacterial systems for the transformation of ECs, offering a sustainable strategy for bioremediation and the restoration of ecosystem health.

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藻类驱动细菌产生的细胞外活性氧用于新兴污染物的降解

新兴污染物在天然地表水中普遍存在，对水生生态系统和人类健康构成重大风险。由光自养藻类和相关细菌组成的共生系统为水生环境的生物修复提供了一种很有前途的方法。本研究研究了藻类与细菌相互作用产生的活性氧（ROS）对卡马西平、双氯芬酸、阿替洛尔、磺胺甲恶唑和氧氟沙星五种ECs的降解作用。藻类-细菌系统表现出优异的降解效率，在6天后分别达到96%，97%,89%，72%和77%，远远超过纯细菌或藻类系统的性能。在藻-细菌系统中观察到生物源性ROS水平升高，细胞外超氧自由基（O2•−）和过氧化氢（H2O2）被认为是降解过程的关键驱动因素。在ECs胁迫下，藻-细菌系统通过上调碳水化合物、脂质、氨基酸和核苷酸代谢相关途径来维持细胞完整性和代谢活性，从而增强其抵抗力。这些发现强调了藻-细菌系统对生态系统转化的巨大潜力，为生物修复和生态系统健康恢复提供了可持续的策略。

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来源期刊

Science of the Total Environment 环境科学-环境科学

CiteScore

17.60

自引率

10.20%

发文量

8726

审稿时长

2.4 months

期刊介绍： The Science of the Total Environment is an international journal dedicated to scientific research on the environment and its interaction with humanity. It covers a wide range of disciplines and seeks to publish innovative, hypothesis-driven, and impactful research that explores the entire environment, including the atmosphere, lithosphere, hydrosphere, biosphere, and anthroposphere. The journal's updated Aims & Scope emphasizes the importance of interdisciplinary environmental research with broad impact. Priority is given to studies that advance fundamental understanding and explore the interconnectedness of multiple environmental spheres. Field studies are preferred, while laboratory experiments must demonstrate significant methodological advancements or mechanistic insights with direct relevance to the environment.