We can't find the internet
Attempting to reconnect
Something went wrong!
Hang in there while we get back on track
Assessing the fate of microplastics in multi-stage treatment units through distribution patterns and settling dynamics models
Summary
Researchers evaluated the fate of microplastics across multiple treatment stages in wastewater treatment plants using diversity indices and settling dynamics models. They found that MPs were distributed across both water and sludge phases, with removal efficiency varying by treatment stage and particle characteristics.
Microplastics (MPs) are a new contaminant of global concern that have been found in wastewater treatment plants (WWTPs) as a result of human activities, which serve a dual function as critical barriers and pathways to natural waters and sludge-based applications. This study comprehensively evaluates the fate of MPs in multi-stage treatment units, covering both the water and sludge phases. It applies diversity assessments (Simpson Diversity Index [SDI], Shannon-Wiener Diversity Index [SWDI], and Principal Component Analysis [PCA]) and settling dynamics models (Mass Balance Model [MBM] and Terminal Settling Velocity Model [TSVM]). It was found that the concentration of MPs in water and sludge phases ranged from 2 to 1152 items/L and 35.65-85.05 × 10 items/kg DW, respectively. MPs removal at the Taoyuan WWTP achieved 97.42 % after nitrite-denitrification and phosphorus removal (TNCU) processes. Despite these high removal rates, fibers and fragments dominate the MPs in the water phases (35.36 % and 14.25 %) and sludge phases (21.06 % and 17.26 %), which are mostly 50-125 μm in size. Further confirmation of the polymer characteristics in both matrices revealed that rayon (51.12 %) and polystyrene (36.59 %) were dominant, respectively. Subsequently, the diversity assessments showed greater variation and homogeneity of MPs characteristics in the sludge phases than in the water phases. Meanwhile, PCA results showed that specific MP characteristics (e.g., shape, size, polymer type) significantly influenced their grouping patterns across treatment stages. Among settling dynamics fate models implemented in this study, MBM confirmed that MPs are accumulated in the sludge phases, while TSVM indicated that the settling mechanisms of MPs was strongly influenced by their size and density. These findings offer new insights into MPs' fate and behavior in WWTPs, supporting the development of more effective mitigation strategies.
Sign in to start a discussion.
More Papers Like This
Transport and fate of microplastic particles in wastewater treatment plants
Researchers tracked microplastic particles through multiple stages of a wastewater treatment plant, finding that particles were concentrated in sludge but that a fraction passed through each treatment stage and remained in the final effluent.
Improved methodology to determine the fate and transport of microplastics in a secondary wastewater treatment plant
An improved methodology was applied to track the fate and transport of microplastics through a wastewater treatment plant, measuring particle size, shape, and polymer type at multiple treatment stages. The study found that while most microplastics are removed during primary and secondary treatment, smaller particles persist into the effluent and sludge.
Fate of Microplastic Pollution Along the Water and Sludge Lines in Municipal Wastewater Treatment Plants
Researchers evaluated microplastic abundance and distribution across three municipal wastewater treatment plants using different treatment technologies. The study found that all three plants achieved greater than 97% microplastic removal along the water treatment line, with microplastics concentrating in the sludge fraction, underscoring the important role of sludge treatment in sequestering microplastics from wastewater.
Influence of wastewater treatment process on pollution characteristics and fate of microplastics
Researchers investigated microplastic abundance and removal efficiency across four wastewater treatment plants using different treatment technologies, finding influent concentrations between 539 and 1,290 particles per liter that were reduced substantially by primary and secondary treatment. Smaller microplastic particles proved hardest to remove and most likely to persist in final effluent.
Research progress on microplastics in wastewater treatment plants: A holistic review
This review provides a holistic assessment of microplastics in wastewater treatment plants, covering sampling methods, occurrence patterns across treatment stages, removal efficiencies, and the environmental risks posed by microplastic discharge through effluent and sludge.