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Biodegradable versus persistent nanoplastics reshape nitrogen metabolism and biofilm architecture in denitrifying biofilters
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Tiny plastic particles—whether from "biodegradable" plastics or regular plastics like polystyrene—can disrupt the bacteria that treat our wastewater and remove pollution, cutting their effectiveness by up to 35%. This matters because these microbial communities help clean water before it's released back into the environment, and if nanoplastics are quietly weakening that process, it could mean more untreated waste (and potentially more nanoplastics themselves) ending up in our water supply. The findings also suggest that switching to "biodegradable" plastics isn't automatically safer—they affect treatment systems differently, but not necessar
The presence of nanoplastics (NPs) in biological wastewater treatment systems is an emerging concern. Nevertheless, their differential influence on critical biofilm-mediated processes has yet to be fully elucidated. In this study, denitrifying biofilters were exposed to biodegradable polylactic acid nanoplastics (PLA-NPs) and non-biodegradable polystyrene nanoplastics (PS-NPs) to simulate both typical and cumulative high-exposure scenarios. Results showed that long-term NP stress significantly reduced the denitrification performance, with a maximum inhibition of 35% in total nitrogen (TN) removal. Mechanistically, PLA and PS induced distinct biofilm remodeling strategies. PLA exposure enhanced nitrate assimilation pathways, promoting nitrogen sequestration into microbial biomass. In contrast, PS-NPs elicited concentration-dependent stress responses. Low PS exposure was associated with reduced extracellular polymeric substances (EPS) and enhanced carbohydrate degradation potential, whereas high PS concentrations were linked to altered EPS composition, decreased microbial diversity, and directional succession toward stress-tolerant genera. Metagenomic analysis revealed shifts in central carbon metabolic strategies, including enhanced gluconeogenesis and EPS precursor synthesis under NP exposure. Differences in substrate bioavailability between PLA and PS treatments further contributed to distinct carbon utilization patterns within the biofilms. Overall, this study demonstrates that NP biodegradability governs biofilm functional stability, nitrogen transformation, and denitrification performance, providing mechanistic insight into NP-biofilm interactions in engineered systems.
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Differential impacts of conventional and biodegradable microplastics on treatment performance and bacterial community in sequencing batch reactors
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"Biodegradable" plastics are often assumed to be the eco-friendly choice, but this study found that biodegradable microplastics (PLA) actually disrupted wastewater treatment more than conventional plastics like polystyrene or polyethylene, reducing bacteria's ability to break down waste and potentially allowing harmful microbes to thrive. This matters because wastewater treatment plants help keep our water supply clean, so if biodegradable plastics interfere with that process, it could undermine efforts to protect water quality even as we try to reduce plastic pollution.
Insight into effect of polyethylene microplastic on nitrogen removal in moving bed biofilm reactor: Focusing on microbial community and species interactions
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Researchers studied how polyethylene microplastics affect nitrogen removal in wastewater treatment bioreactors and found that low concentrations slightly improved the process, while higher concentrations disrupted it. The microplastics changed the microbial communities responsible for breaking down nitrogen in wastewater. This matters because less effective wastewater treatment means more nitrogen pollution in waterways, and microplastics entering treatment plants could reduce their ability to clean water effectively.
Mechanistic insights into superior biofilm formation with heterotrophic nitrification-aerobic denitrification bacteria under polypropylene microplastic stress
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Microplastics are known to mess with the helpful bacteria that treat wastewater and remove nitrogen pollution, but this study found that using a special type of bacteria to "seed" water treatment systems made them much more resistant to this disruption. This matters because as plastic pollution keeps growing, protecting the microbial communities that clean our water is essential for keeping waterways—and the water we eventually drink—free of excess nitrogen pollution.
Concentration threshold for polyethylene microplastics impacting nitrogen transfor-mation in heterotrophic nitrification-aerobic denitrification systems
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Scientists found that tiny plastic bits (like those breaking down from everyday plastic bags) can mess with the natural bacteria in water treatment systems that remove nitrogen pollution, but the effect depends on how much plastic is present. At low levels, the plastic actually helps bacteria grow by giving them surfaces to cling to, but past a certain concentration, chemicals leaching from the plastic start killing off these helpful microbes, causing harmful nitrogen compounds to build up. This matters because it means water treatment plants and natural ecosystems already contaminated with microplastics may struggle to properly clean water, pot
Impact and microbial mechanism of continuous nanoplastics exposure on the urban wastewater treatment process
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Researchers investigated the effects of continuous nanoplastic exposure on wastewater treatment over 200 days, finding that while total nitrogen removal was not significantly inhibited, nanoplastics altered microbial community composition and affected nitrification and denitrification processes.
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