We can't find the internet
Attempting to reconnect
Something went wrong!
Hang in there while we get back on track
Responses of performance, antibiotic resistance genes and bacterial communities of partial nitrification system to polyamide microplastics
Summary
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.
Polyamide (PA), a prevalent microplastics (MPs), is often collected from wastewater treatment plants. However, the responses of partial nitrification system to PA MPs are unclear. The short-term and long-term effect of PA MPs on the partial nitrification system was slight, but the ammonia oxidation rate decreased slowly with the increase of PA MPs concentration. Meantime, the PA MPs addition could decrease the microbial diversity, alter microbial community structure of the system and facilitate the propagation of antibiotic resistance genes (ARGs) including fabI, intI1 and Tn916/1545. Correlation analysis and network analysis indicated that Ferruginibacter, Hyphomicrobium, Terrimonas, Brevundimonas and Plasticicumulans in the system might be the dominant hosts of ARGs. In addition, oligotyping analysis indicated not all oligotypes of the relevant genus showed positive correlation with ARGs. In general, PA MPs had almost no effect on performance but altered community structure and increased ARGs spread risk of the partial nitrification system.
Sign in to start a discussion.
More Papers Like This
Microplastics 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.