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20 resultsShowing papers similar to Impact and microbial mechanism of continuous nanoplastics exposure on the urban wastewater treatment process
ClearUnveiling 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.
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.
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.
Long-term exposure to nanoplastics reshapes the microbial interaction network of activated sludge
Researchers found that long-term nanoplastic exposure over 140 days progressively degraded activated sludge treatment performance, reducing nitrogen and phosphorus removal by reshaping microbial interaction networks into smaller, less complex structures.
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.
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.
Nanoplastics Disturb Nitrogen Removal in Constructed Wetlands: Responses of Microbes and Macrophytes
The impact of nanosized plastics on nitrogen removal in constructed wetlands was investigated by examining microbial community responses and denitrification processes. Nanoplastics disturbed biological nitrogen removal in the wetland system, with microorganisms showing altered community structure and reduced denitrification efficiency.
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.
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.
Mechanisms underlying the detrimental impact of micro(nano)plastics on the stability of aerobic granular sludge: Interactions between micro(nano)plastics and extracellular polymeric substances
Researchers found that both micro- and nanoplastics at realistic concentrations harmed the performance of aerobic granular sludge, a technology used for wastewater treatment, by reducing its ability to remove nitrogen. The plastic particles interacted with the sticky substances that hold the sludge granules together, weakening their structural integrity. The study reveals a specific mechanism by which plastic pollution can undermine wastewater treatment systems that communities rely on for clean water.
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.
Nitrogen metabolic responses of non-rhizosphere and rhizosphere microbial communities in constructed wetlands under nanoplastics disturbance
Researchers compared how microbial communities in plant root zones versus non-root zones of constructed wetlands respond to nanoplastic contamination. They found that nanoplastics reduced beneficial nitrogen-processing bacteria near roots by nearly 18%, while non-root microbes showed greater adaptability, even using nanoplastics as a carbon source. The findings suggest that constructed wetlands, which are important for water treatment, may have their nitrogen-removal capabilities impaired by nanoplastic pollution.
Polystyrene nanoplastics reshape the anaerobic granular sludge for recovering methane from wastewater
Researchers investigated the long-term effects of polystyrene nanoplastics on anaerobic granular sludge used for methane recovery from wastewater over a 120-day continuous test. The study found that while low nanoplastic concentrations had minimal impact, higher concentrations reshaped the microbial community structure and altered sludge performance, raising concerns about nanoplastic effects on wastewater treatment processes.
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.
Microplastic interference influences Pseudomonas fluorescens in denitrification efficiency of wastewater treatment
Researchers investigated how microplastics interfere with Pseudomonas fluorescens activity in denitrification processes at wastewater treatment plants, finding that microplastic contamination disrupted microbial performance and could compromise nitrogen removal from wastewater.
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.
Nanoplastics enhance the denitrification process and microbial interaction network in wetland soils
This study found that nanoplastics in wetland soils increased denitrification -- the process that converts nitrates into nitrogen gas -- by reshaping the microbial community and strengthening cooperative networks among bacteria. While this is primarily an environmental finding, changes to nitrogen cycling in wetlands can affect water quality in ways that ultimately influence human drinking water sources.
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.
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.
Effect evaluation of microplastics on activated sludge nitrification and denitrification
Researchers found that microplastics entering wastewater treatment plants interfere with the nitrification and denitrification processes carried out by activated sludge microbes, potentially reducing the effectiveness of nutrient removal in sewage treatment. This effect could undermine water quality if microplastic loads in wastewater continue to increase.