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Responses mechanisms of resistance genes in partial nitrification and anammox system under single and combined exposure to polystyrene nanoplastics and dodecyl dimethyl benzyl ammonium chloride
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Responses of performance, antibiotic resistance genes and bacterial communities of partial nitrification system to polyamide microplastics
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Short- and long-term exposure of a partial nitrification bioreactor to polyamide microplastics found that while overall treatment performance was minimally affected, chronic exposure elevated ammonia oxidation rates and shifted bacterial community composition, with enrichment of microplastic-colonizing taxa potentially altering nitrogen removal pathways over time.
Individual and combined effects of silver nanoparticles and polyvinyl chloride microplastics on the activity and abundance of ammonia-oxidizing microorganisms from a wastewater treatment system
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Silver nanoparticles (used in some antibacterial products) can shut down helpful bacteria in wastewater treatment plants that normally break down ammonia into less harmful substances, and this damage gets worse at higher concentrations. Interestingly, microplastics alone didn't cause harm, but when microplastics had already settled in the water, they actually softened the silver nanoparticles' toxic effects, showing that pollutants can interact in unexpected ways. This matters because if wastewater treatment doesn't work properly, ammonia and other pollutants could end up back in our water supply.
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