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Insights into the Differential Impacts of Polystyrene Microplastics and Nanoplastics on Sequencing Batch Reactor Performance: From Physiological Stress to Antibiotic Resistance Gene Dissemination
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Tiny plastic particles from everyday waste can slip into wastewater treatment plants and get absorbed into the microbes that clean our water. Researchers found that the smallest particles, nanoplastics, stressed these microbes and helped spread antibiotic resistance genes more than larger microplastics did. This matters because it suggests plastic pollution could be quietly helping antibiotic resistant bacteria multiply and spread through our water systems.
The widespread occurrence of microplastics (MPs) and nanoplastics (NPs) in wastewater treatment plants (WWTPs) has raised notable ecological concerns. This study investigated the multi-level impacts of polystyrene (PS) MPs and NPs on activated sludge in sequencing batch reactors (SBRs). Although long-term exposure to PS particles (up to 200 mg/L MPs and 50 mg/L NPs) did not compromise the macro-performance of the SBRs (with COD, NH4+-N, and TP removal efficiencies remaining >90%), the physical and biological integrity of the sludge was significantly altered. Sludge volume index (SVI) analysis revealed a decline in settleability, particularly under NP stress, which was corroborated by laser scanning confocal microscopy (LSCM) and transmission electron microscopy (TEM) observations showing the internalization of NPs into microbial cells. Physiologically, PS NPs induced higher levels of reactive oxygen species (ROS) and lactate dehydrogenase (LDH) release, indicating substantial oxidative stress and membrane damage. Furthermore, high-throughput sequencing and qPCR analysis demonstrated that PS particles reshaped the microbial community, enriching the antibiotic-resistant genus Acinetobacter and various antibiotic resistance genes (ARGs) such as sulII and tetG. Notably, PS NPs exhibited a more pronounced effect on ARG dissemination than MPs, even at lower mass concentrations, by facilitating horizontal gene transfer (HGT) through increased cell membrane permeability. These findings elucidate the distinct toxicological mechanisms of NPs in biological treatment systems and highlight their role as catalysts for the environmental spread of antibiotic resistance.
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Scientists found that different types of microplastics in wastewater treatment plants can boost antibiotic-resistant bacteria in different ways, some plastics helped resistant genes spread more easily between bacteria, making the problem harder to contain. This matters because wastewater treatment plants are supposed to help protect us from pollution, but these findings suggest the type of plastic contamination present could affect how much antibiotic resistance ends up back in our environment, potentially making infections harder to treat down the line.
Size-dependent effects of microplastics on antibiotic resistance genes fate in wastewater treatment systems: The role of changed surface property and microbial assemblages in a continuous exposure mode
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Researchers developed a continuous exposure method to evaluate how different sizes of microplastics affect antibiotic resistance gene fate in wastewater treatment, finding that smaller microplastics had greater impacts on microbial communities and resistance gene proliferation.
Unraveling the effect of micro/nanoplastics on the occurrence and horizontal transfer of environmental antibiotic resistance genes: Advances, mechanisms and future prospects
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This review examines how micro- and nanoplastics promote the spread of antibiotic resistance genes in the environment. The tiny plastic particles create conditions that help bacteria exchange resistance genes more easily by generating oxidative stress, making cell membranes more permeable, and providing surfaces where resistant bacteria can form communities. This is a growing public health concern because antibiotic-resistant infections are increasingly difficult to treat.
Contribution of microplastic particles to the spread of resistances and pathogenic bacteria in treated wastewaters
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Researchers studied microplastic particles collected from treated wastewater effluents and found that MPs harbored significantly higher loads of antibiotic resistance genes and pathogenic bacteria compared to surrounding water, suggesting MPs facilitate their environmental spread.
Micro- and Nanoplastics: Hidden Environmental Catalysts of Antimicrobial Resistance
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Tiny plastic bits called microplastics and nanoplastics—created when everyday plastic waste breaks down from sun exposure, weather, and other natural forces—have spread throughout our water, soil, and air. This review paper explains how these particles form and travel so easily through the environment, raising concerns about their potential role in helping harmful bacteria become resistant to antibiotics. Understanding this hidden connection matters because antibiotic resistance is already a major public health threat, and widespread plastic pollution could be quietly making the problem worse.
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