Biodegradable and traditional microplastics affect sediment DOM: Chemical properties, keystone microbes, functional genes

IF 6.9 2区环境科学与生态学 Q1 ENGINEERING, CHEMICAL

Process Safety and Environmental Protection Pub Date : 2025-03-28 DOI:10.1016/j.psep.2025.107074

Jinjiang Duan , Jianhao Song , Cheng Yang , Yuanyuan Feng , Qingping Zou , Ziwei Chen , Gang Cao , Jia Pu , Han Zhang , Yu Xiang , Mengli Chen

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引用次数: 0

Abstract

Microplastics (MPs) are emerging contaminants and accumulate in river sediments, which pose great threaten to the self-purification capacity of rivers by affecting the fate of dissolved organic matter (DOM). Although the impact of MPs on sediment DOM has already been confirmed, it remains unclear how differences in MP characteristics affect the chemical properties of DOM. Thus, this study selects 2 traditional MPs (polystyrene, PS; polypropylene, PP) and 1 biodegradable MPs (polylactic acid, PLA) to construct microcosm incubation system. We found a 3.17-fold increase in DOM concentrations within biodegradable MPs, while traditional MPs exhibited a marked reduction of 76 %-97 % in DOM humification. FTIR analysis indicated biodegradable MPs enhance degradation of carboxylic acids in DOM. Microbial analysis showed that MPs pollution significantly changed the composition and community of keystone microbes in sediment. Compared to PS (6) and PP (4), PLA (11) enriched more tolerant microbes in sediments and significantly reduced the abundance of functional genes associated with methanotrophy (23 %) and hydrocarbon_degradation (25 %). Our results further revealed that MPs affected DOM fractions by changing the composition and abundance of keystone microbes, thereby increasing the sediment DOM concentration. This study provided a new insight into the ecological risks of MPs in river ecosystems.

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来源期刊

Process Safety and Environmental Protection 环境科学-工程：化工

CiteScore

11.40

自引率

15.40%

发文量

929

审稿时长

8.0 months

期刊介绍： The Process Safety and Environmental Protection (PSEP) journal is a leading international publication that focuses on the publication of high-quality, original research papers in the field of engineering, specifically those related to the safety of industrial processes and environmental protection. The journal encourages submissions that present new developments in safety and environmental aspects, particularly those that show how research findings can be applied in process engineering design and practice. PSEP is particularly interested in research that brings fresh perspectives to established engineering principles, identifies unsolved problems, or suggests directions for future research. The journal also values contributions that push the boundaries of traditional engineering and welcomes multidisciplinary papers. PSEP's articles are abstracted and indexed by a range of databases and services, which helps to ensure that the journal's research is accessible and recognized in the academic and professional communities. These databases include ANTE, Chemical Abstracts, Chemical Hazards in Industry, Current Contents, Elsevier Engineering Information database, Pascal Francis, Web of Science, Scopus, Engineering Information Database EnCompass LIT (Elsevier), and INSPEC. This wide coverage facilitates the dissemination of the journal's content to a global audience interested in process safety and environmental engineering.