We can't find the internet
Attempting to reconnect
Something went wrong!
Hang in there while we get back on track
Papers
61,005 resultsShowing papers similar to Responses of performance, antibiotic resistance genes and bacterial communities of partial nitrification system to polyamide microplastics
ClearMicroplastics affect the ammonia oxidation performance of aerobic granular sludge and enrich the intracellular and extracellular antibiotic resistance genes
Exposure of aerobic granular sludge to PVC, PA, PS, and PE microplastics at 10 mg/L inhibited ammonia oxidation but nitrification recovered over time; all four MP types enriched intracellular and extracellular antibiotic resistance genes and suppressed ammonia-oxidizing bacteria.
Impact of polyethylene microplastics on the nitrogen removal and bacterial community in sequencing batch reactor at different hydraulic retention times
Researchers examined how polyethylene microplastics affect nitrogen removal performance in biological wastewater treatment at different hydraulic retention times. The study found that the presence of microplastics amplified the negative effects of shortened treatment times on nitrogen removal efficiency and altered bacterial communities and enzyme levels involved in nitrification and denitrification, offering new insights into how microplastics interfere with wastewater treatment processes.
Exposure to polyamide 66 microplastic leads to effects performance and microbial community structure of aerobic granular sludge
Polyamide 66 microplastics were introduced into aerobic granular sludge bioreactors at varying concentrations, initially reducing contaminant removal efficiency but recovering to near-control levels by the end of the experiment. The study shows that while microplastics transiently disrupt biological wastewater treatment, the microbial community can adapt over time.
Effects of microplastics accumulation on performance of membrane bioreactor for wastewater treatment
Researchers simulated the long-term accumulation of polypropylene microplastics in membrane bioreactors used for wastewater treatment. They found that while microplastic accumulation did not reduce the removal of key pollutants like COD and ammonia nitrogen, it did increase membrane fouling and alter the composition of microbial communities in the reactor. The study suggests that microplastic buildup in wastewater treatment systems may affect operational efficiency over time.
Insight into effect of polyethylene microplastic on nitrogen removal in moving bed biofilm reactor: Focusing on microbial community and species interactions
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.
Effect of long-term exposure to non-biodegradable and biodegradable microplastics in continuous anoxic/aerobic bioreactors: Nitrogen removal performance, microbial communities and functional gene responses
Researchers compared the effects of biodegradable and non-biodegradable microplastics on nitrogen removal in wastewater treatment bioreactors over an extended period. They found that biodegradable polylactic acid particles were actually more harmful than conventional PET microplastics, significantly reducing the efficiency of ammonia removal by damaging beneficial bacteria. The study challenges the assumption that biodegradable plastics are always safer for wastewater treatment systems.
Responses of nitrogen removal, microbial community and antibiotic resistance genes to biodegradable microplastics during biological wastewater treatment
Researchers compared the effects of three biodegradable microplastics on nitrogen removal and microbial communities in activated sludge wastewater treatment. They found that PHA and PLA at higher concentrations enhanced denitrification but also promoted antibiotic resistance genes, while PBS had minimal effects. The study suggests that the breakdown of biodegradable plastics into microplastics in wastewater systems may have complex and sometimes counterintuitive effects on treatment performance.
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.
Long-term effect of polyethylene microplastics on the bioelectrochemical nitrogen removal process
Researchers explored how polyethylene microplastics affect nitrogen removal in bioelectrochemical wastewater treatment systems over long-term exposure. The study found that microplastic exposure reduced nitrogen removal efficiency by decreasing biofilm viability, lowering extracellular polymeric substance content, and significantly shifting the microbial community structure responsible for nitrogen processing.
Microplastics accelerate nitrification, shape the microbial community, and alter antibiotic resistance during the nitrifying process
Researchers found that adding microplastics to wastewater treatment systems actually sped up nitrification (a key step in processing sewage) but also promoted the growth of antibiotic-resistant bacteria. Even biodegradable PLA plastics, often considered more environmentally friendly, significantly increased antibiotic resistance genes. This study warns that microplastics in wastewater systems could be accelerating the spread of antibiotic resistance, a major public health threat.
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.
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.
Effects of microplastic biofilms on nutrient cycling in simulated freshwater systems
Polypropylene microplastic biofilms in freshwater microcosms accelerated nitrogen cycling processes including ammonia oxidation and denitrification, and temporarily accumulated phosphorus before releasing it as biofilms matured and broke apart. The results demonstrate that microplastic-associated biofilms actively alter nutrient dynamics in freshwater systems, with potential consequences for water quality.
Microplastics provide new niches for nitrifiers to maintain nitrification performance in nitrifying bioreactors
Researchers found that microplastics provide novel niches for nitrifying bacteria in wastewater treatment systems, with MP surfaces maintaining nitrification performance even under stress conditions that suppress conventional nitrifiers, suggesting unexpected ecosystem services from plastic contamination in treatment settings.
Effects of exposure to polyether sulfone microplastic on the nitrifying process and microbial community structure in aerobic granular sludge
Scientists added polyether sulfone microplastics to aerobic granular sludge bioreactors at different concentrations and found only minor effects on ammonia removal but an increase in total nitrogen removal efficiency of 5.6%, along with shifts in nitrifying microbial community structure.
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.
Response of wastewater treatment performance and bacterial community to original and aged polyvinyl chloride microplastics in sequencing batch reactors
This study found that PVC microplastics, both fresh and aged, severely harmed wastewater treatment processes by reducing the removal of harmful chemicals like ammonia and organic pollutants. The microplastics shifted the bacterial communities in the treatment system, reducing helpful nitrogen-removing bacteria while promoting other types. This means microplastic contamination of wastewater plants could lead to poorer water treatment quality, allowing more pollutants to reach rivers and drinking water sources.
Analysis of the Partial Nitrification Process Affected by Polyvinylchloride Microplastics in Treating High-Ammonia Anaerobic Digestates
Researchers found that PVC microplastics at high concentrations inhibited the partial nitrification process used to treat ammonia-rich wastewater from anaerobic digesters. The findings indicate that microplastics accumulating in wastewater treatment systems can interfere with biological nitrogen removal.
Insights into N2O turnovers under polyethylene terephthalate microplastics stress in mainstream biological nitrogen removal process
Long-term exposure of biological nitrogen removal (BNR) wastewater systems to polyethylene terephthalate microplastics at concentrations up to 500 micrograms per liter altered nitrous oxide (N2O) production and reduction during denitrification over 100-plus days of treatment. The findings suggest MPs in municipal wastewater could inadvertently increase greenhouse gas emissions from wastewater treatment plants.
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.
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.
Unveiling the plastisphere in anammox process: Physicochemical evolution of microplastics and microbial succession dynamics
Researchers tracked how polyethylene terephthalate microplastics change physically and chemically over 30 days in an anaerobic wastewater treatment system. They found that while the microplastics had minimal impact on nitrogen removal efficiency, they developed distinct microbial communities on their surfaces that evolved over time. The study provides new insights into how microplastics interact with beneficial microbes in wastewater treatment processes.