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20 resultsShowing papers similar to Polystyrene nanoparticles regulate microbial stress response and cold adaptation in mainstream anammox process at low temperature
ClearExposure 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.
Effects of unmodified and amine-functionalized polystyrene nanoplastics on nitrogen removal by Pseudomonas stutzeri: strain characteristics, extracellular polymers, and transcriptomics
Researchers investigated how two types of polystyrene nanoplastics — plain and amine-modified — affect the ability of bacteria to remove nitrogen from water, a process important for wastewater treatment. The amine-coated nanoplastics were found to be more disruptive than unmodified ones, altering the bacteria's cell surface, extracellular proteins, and gene expression. This matters because nanoplastics entering wastewater systems could undermine the biological processes that keep treated water safe to release into the environment.
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.
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.
Insights into combined stress mechanisms of microplastics and antibiotics on anammox: A critical review
This review examines how microplastics and antibiotics together affect anammox bacteria, which are important for removing nitrogen from wastewater. Researchers found that combined exposure disrupts the bacteria through oxidative stress, cell membrane damage, and interference with key enzymes, often more severely than either pollutant alone. The study highlights that microplastic and antibiotic contamination in wastewater could undermine biological treatment processes.
Polystyrene nanoplastics and pathogen plasticity: Toxic threat or tolerated stressor in Salmonella enterica?
Researchers examined how polystyrene nanoplastics affect Salmonella enterica, a major foodborne pathogen, across a range of concentrations. They found that nanoplastics induced oxidative stress, membrane damage, and increased biofilm formation, while also triggering early activation of virulence and stress-response genes. The study suggests that nanoplastic pollution in the environment could alter bacterial survival strategies and potentially influence food safety risks.
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.
Mechanisms of inhibition and recovery under multi-antibiotic stress in anammox: A critical review
This review examines how antibiotics, alongside other emerging pollutants like microplastics and nanomaterials, inhibit the anammox process used in wastewater treatment for nitrogen removal. The researchers detail multiple mechanisms by which antibiotics disrupt these specialized bacteria, including damage to cell membranes, enzyme inhibition, and interference with key metabolic pathways. Understanding these mechanisms is important for developing strategies to maintain effective wastewater treatment in the face of increasing antibiotic contamination.
A review of microplastics on anammox: Influences and mechanisms
This review summarizes how microplastics affect anammox, a key biological process used in wastewater treatment to remove nitrogen. Microplastics disrupt the microbial communities that perform this process, reducing treatment efficiency depending on plastic concentration, size, and type. Since wastewater treatment is a critical barrier preventing pollutants from reaching drinking water sources, any reduction in treatment performance could increase human exposure to contaminants.
How anammox responds to the emerging contaminants: Status and mechanisms
This review synthesizes research on how emerging contaminants including antibiotics, nanomaterials, heavy metals, and microplastics affect anammox bacteria used in wastewater nitrogen removal, identifying inhibition thresholds and possible recovery mechanisms.
Deciphering anammox response characteristics and potential mechanisms to polyethylene terephthalate microplastic exposure
This study tested how PET microplastics affect the bacteria used in wastewater treatment for removing nitrogen pollutants. Long-term exposure to high concentrations of PET microplastics reduced the nitrogen removal efficiency by nearly 29%, though the system partially recovered over three months. The findings matter because compromised wastewater treatment means more pollutants could end up in waterways that supply drinking water.
Exposure to polystyrene nanoplastic leads to inhibition of anaerobic digestion system
Researchers showed that polystyrene nanoplastics inhibit methane production in sewage sludge digesters in a concentration-dependent manner, reducing methane yield by up to 14% and delaying the process start-up while shifting microbial community composition away from key methane-producing archaea.
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.
Impacts of Microplastics on Anammox Systems: A Comprehensive Review of Mechanisms and Influences
This review examines how microplastics affect anammox wastewater treatment systems, which are used for biological nitrogen removal. The study found that low concentrations of microplastics can actually enhance system performance by acting as biofilm carriers, while high concentrations inhibit the process through physical clogging, toxic effects, and oxidative stress.
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.
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.
Do microbial decomposers find micro- and nanoplastics to be harmful stressors in the aquatic environment? A systematic review of in vitro toxicological research
Researchers systematically reviewed in vitro studies on how bacteria and fungi respond to micro- and nanoplastics, finding that polystyrene particles and E. coli dominate the literature and that nanoplastic toxicity commonly disrupts antioxidative systems, gene expression, and cell membrane integrity in microbial decomposers.
Effects of Microplastics on Nitrogen Removal Performance of Enriched Anammox Cultures
Researchers tested whether polyethylene and polypropylene microplastics affect anammox, a key biological nitrogen removal process used in wastewater treatment. They found that the physical particles themselves did not significantly inhibit the process, but chemical compounds leaching from the plastics, particularly the plasticizer dibutyl phthalate, caused temporary inhibition. Systems using granular or attached biomass structures showed better resilience to these chemical effects than suspended growth systems.
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.
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.