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20 resultsShowing papers similar to Effects of unmodified and amine-functionalized polystyrene nanoplastics on nitrogen removal by Pseudomonas stutzeri: strain characteristics, extracellular polymers, and transcriptomics
ClearPseudomonas Stutzeri may alter the environmental fate of polystyrene nanoplastics by trapping them with increasing extracellular polymers
Researchers found that the denitrifying bacterium Pseudomonas stutzeri physically traps polystyrene nanoplastics within secreted extracellular polymers, which impairs bacterial growth and nitrogen removal gene expression while altering the particles' environmental fate and dispersal.
Metagenomic analysis reveals the responses of microbial communities and nitrogen metabolic pathways to polystyrene micro(nano)plastics in activated sludge systems
Scientists used genetic analysis to study how polystyrene micro- and nanoplastics disrupt the bacteria that process nitrogen in wastewater treatment systems. At high concentrations, the plastics reduced nitrogen removal efficiency by up to 30% by generating harmful reactive oxygen species that damaged key microbial processes. This is concerning because less effective wastewater treatment means more pollutants, including microplastics themselves, could end up in waterways.
Uncovering the toxic effects and adaptive mechanisms of aminated polystyrene nanoplastics on microbes in sludge anaerobic digestion system: Insight from extracellular to intracellular
Researchers investigated how nanoplastics with amino functional groups affect the anaerobic digestion process used to treat sewage sludge. They found that these surface-modified nanoplastics reduced methane production and disrupted the microbial communities responsible for breaking down waste. The study reveals that chemically modified nanoplastics may be more disruptive to wastewater treatment processes than unmodified particles.
Effects of polystyrene nanoplastics on extracellular polymeric substance composition of activated sludge: The role of surface functional groups
Researchers investigated how three types of polystyrene nanoplastics with different surface functional groups affect activated sludge used in wastewater treatment. All three types significantly reduced total protein production in the sludge and caused cellular oxidative stress and membrane damage, with positively charged particles causing the most harm. The findings suggest that nanoplastic contamination in wastewater could impair the biological processes essential for effective sewage treatment.
Polystyrene nanoparticles regulate microbial stress response and cold adaptation in mainstream anammox process at low temperature
Researchers found that polystyrene nanoplastics at concentrations above 0.5 mg/L significantly impair nitrogen removal by anammox bacteria (microbes that convert ammonia to nitrogen gas) in wastewater treatment, with nanoplastics inducing oxidative stress, damaging cell membranes, and binding to cold-shock proteins that are critical for low-temperature bacterial performance.
Distinct responses of Pseudomonas aeruginosa PAO1 exposed to different levels of polystyrene nanoplastics
Researchers examined the molecular mechanisms by which polystyrene nanoplastics affect Pseudomonas aeruginosa, finding dose-dependent responses in growth, metabolism, and virulence gene expression that reveal how nanoplastics interact with environmentally relevant bacteria.
Exposure to nanoplastic induces cell damage and nitrogen inhibition of activated sludge: Evidence from bacterial individuals and groups
Researchers exposed activated sludge in a wastewater treatment reactor to polystyrene nanoplastics at concentrations up to 10 mg/L over 30 days. They found that nanoplastic exposure caused cell membrane damage, increased oxidative stress, and significantly inhibited nitrogen removal processes. The study suggests that nanoplastic accumulation in wastewater treatment plants could compromise their ability to effectively process nitrogen-containing pollutants.
Influence of nanoplastic type on the short-cut nitrification-denitrification in a sequencing batch reactor: Elucidating the metabolic relationship of nitrogen, extracellular polymeric substances, and oxidative stress
Researchers compared the effects of biodegradable (PBAT) and non-biodegradable (polyethylene) nanoplastics on nitrogen-removing bacteria in a wastewater reactor, finding that both types disrupted nitrogen metabolism, extracellular polymer production, and oxidative stress pathways, with non-biodegradable polyethylene causing more severe inhibition of the treatment process.
Microplastics shaped performance, microbial ecology and community assembly in simultaneous nitrification, denitrification and phosphorus removal process
This study found that polystyrene and PVC microplastics disrupted the performance of wastewater treatment systems designed to remove nitrogen and phosphorus, reducing nitrogen removal by up to 10%. The microplastics altered microbial communities, decreased cooperation between beneficial bacteria, and blocked important biological pathways. Since wastewater treatment is a key barrier against pollution reaching drinking water, microplastic interference with these systems could indirectly increase human exposure to harmful contaminants.
The effects of microplastics and nanoplastics on nitrogen removal, extracellular polymeric substances and microbial community in sequencing batch reactor
Researchers found that polystyrene nanoplastics and microplastics impaired nitrogen removal in sequencing batch reactors by reducing denitrification rates, altering extracellular polymeric substances, and shifting microbial community composition in activated sludge.
Surface modification significantly changed the effects of nano-polystyrene on sediment microbial communities and nitrogen metabolism
This study examined how different surface modifications of nano-polystyrene particles affect sediment microbial communities and nitrogen cycling over 60 days. Researchers found that amino-modified nanoplastics significantly inhibited fungal communities and disrupted nitrogen metabolism, while carboxylated and unmodified forms had different effects, demonstrating that surface chemistry is a key factor in nanoplastic toxicity.
Polystyrene nanoparticles induce biofilm formation in Pseudomonas aeruginosa
Researchers found that polystyrene nanoparticles caused the common bacterium Pseudomonas aeruginosa to form thicker biofilms and become more resistant to antibiotics. The nanoplastics damaged bacterial cell membranes and triggered a stress response, prompting the bacteria to produce more protective biofilm as a defense mechanism. This is concerning for human health because it suggests nanoplastic pollution could make disease-causing bacteria harder to treat with existing antibiotics.
Microplastics perturb nitrogen removal, microbial community and metabolism mechanism in biofilm system
Researchers found that polystyrene and PET microplastics reduced total nitrogen removal by 7-16% in biofilm wastewater treatment systems by causing cell damage, altering microbial community structure, and suppressing key genes involved in denitrification and nitrogen conversion.
Mechanistic insights into the impact of multi-dimensional microplastic stress on nitrogen removal by heterotrophic nitrifying-aerobic denitrifying bacteria: A meta-transcriptomic analysis
Researchers studied how different types of microplastics affect bacteria that are used to remove nitrogen from wastewater. They found that PVC microplastics were particularly disruptive, interfering with enzyme function and gene expression needed for denitrification. The study provides molecular-level insights into how microplastic pollution could undermine biological wastewater treatment systems.
Polystyrene nanoplastics shape microbiome and functional metabolism in anaerobic digestion
Researchers studied how polystyrene nanoplastics and microplastics affect the microbial communities and biochemical processes in anaerobic digestion systems used for waste treatment. They found that nanoplastics had a more disruptive effect than microplastics, significantly altering the composition and metabolic functions of the microbial community. The study suggests that plastic contamination in waste streams could reduce the efficiency of anaerobic digestion, a widely used waste processing technology.
[Effect of Differentially Charged Polystyrene Nanoplastics on the Performance of Biological Denitrification in Wastewater Treatment].
This Chinese-language study investigated how positively and negatively charged polystyrene nanoplastics differentially affect the performance of activated sludge in wastewater treatment, finding that surface charge was a key determinant of biological treatment disruption. Positively charged nanoplastics were more toxic to the microbial community.
Responses of nitrogen removal under microplastics versus nanoplastics stress in SBR: Toxicity, microbial community and functional genes
Researchers compared the effects of microplastics versus nanoplastics on nitrogen removal in sequencing batch reactors used in wastewater treatment. The study found that microplastics had no significant effect on nitrogen removal, while high concentrations of nanoplastics impaired the process by disrupting microbial communities and functional gene expression. The results suggest that nanoplastics may pose a greater threat to biological wastewater treatment performance than microplastics.
Impact and microbial mechanism of continuous nanoplastics exposure on the urban wastewater treatment process
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.
The short and long-term effect of polystyrene nanoplastics on nitrifying sludge at high nitrite concentrations
Researchers examined polystyrene nanoplastic effects on nitrifying sludge and found that while short- and long-term exposure had little impact on nitrification performance, long-term exposure shifted the nitrite-oxidizing bacterial community from Nitrobacter to Nitrospira dominance and altered cell metabolism.
Response of aerobic granular sludge under acute inhibition by polystyrene microplastics: Activity, aggregation performance, and microbial analysis
Researchers investigated how different concentrations of polystyrene microplastics affect the performance of aerobic granular sludge used in wastewater treatment. The study found that increasing microplastic concentrations inhibited nitrogen removal rates and disrupted the microbial community structure within the sludge. Evidence indicates that microplastic contamination in wastewater can compromise the effectiveness of biological treatment processes.