Effects of degradable and non-degradable microplastics on SPNEDPR-AGS system: Sludge characteristics, nutrient transformation, key enzyme, and microbial community.

IF 9.7 1区环境科学与生态学 Q1 AGRICULTURAL ENGINEERING

Bioresource Technology Pub Date : 2025-02-01 Epub Date: 2024-11-30 DOI:10.1016/j.biortech.2024.131917

Dongyue Li, Jiarui Li, Dongbo Liang, Yanshuo Wu, Chaofan Xie, Muchen Yin, Yuhan Zhu, Yaodong Wu, Linzhu Du, Junhui Yue, Jun Li, Wei Guo

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引用次数: 0

Abstract

The environmental risk of microplastics (MPs) in aerobic granular sludge (AGS) system is unclear. This study evaluates the effects of non-biodegradable polyvinyl chloride microplastics (PVC-MPs) and biodegradable polylactic acid microplastics (PLA-MPs) on AGS systems. The results showed that both destroyed the performance of AGS systems, with PVC-MPs achieving this by disrupting the AGS structure, while PLA-MPs mainly by causing the expansion of filamentous bacteria induced through the stimulation by lactic acid metabolite (R0: 5.52 ± 0.49 μg/L; R_PLA5: 11.67 ± 0.56 μg/L). Moreover, both MPs inhibited nitrogen removal by disrupting partial nitrification and endogenous denitrification and suppressed key microbes such as Candidatus Competibacter and Nitrosomonas. Metabolic pathway analysis and molecular docking have further confirmed the mechanisms by which MPs affect critical metabolic pathways and key enzymes. Consequently, the hazards of biodegradable MPs to the stable operation of sewage treatment plants should also be of concern.

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可降解和不可降解微塑料对spnedprr - ags系统的影响：污泥特性、营养转化、关键酶和微生物群落

微塑料（MPs）在好氧颗粒污泥（AGS）系统中的环境风险尚不清楚。本研究评价了不可生物降解聚氯乙烯微塑料（PVC-MPs）和生物降解聚乳酸微塑料（PLA-MPs）对AGS系统的影响。结果表明，两者都破坏了AGS系统的性能，其中PVC-MPs通过破坏AGS结构实现破坏，而PLA-MPs主要通过乳酸代谢物刺激诱导丝状菌的扩张(R0: 5.52 ± 0.49 μg/L； RPLA5: 11.67±0.56  μg / L)。此外，这两种MPs通过破坏部分硝化和内源反硝化作用来抑制氮的去除，并抑制关键微生物如候选竞争菌和亚硝化单胞菌。代谢途径分析和分子对接进一步证实了MPs影响关键代谢途径和关键酶的机制。因此，可生物降解MPs对污水处理厂稳定运行的危害也值得关注。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Bioresource Technology 工程技术-能源与燃料

CiteScore

20.80

自引率

19.30%

发文量

2013

审稿时长

12 days

期刊介绍： Bioresource Technology publishes original articles, review articles, case studies, and short communications covering the fundamentals, applications, and management of bioresource technology. The journal seeks to advance and disseminate knowledge across various areas related to biomass, biological waste treatment, bioenergy, biotransformations, bioresource systems analysis, and associated conversion or production technologies. Topics include: • Biofuels: liquid and gaseous biofuels production, modeling and economics • Bioprocesses and bioproducts: biocatalysis and fermentations • Biomass and feedstocks utilization: bioconversion of agro-industrial residues • Environmental protection: biological waste treatment • Thermochemical conversion of biomass: combustion, pyrolysis, gasification, catalysis.