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Microplastics in the freshwater and terrestrial environments: Prevalence, fates, impacts and sustainable solutions
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This review analyzed over 100 studies on microplastic pollution in freshwater and terrestrial environments, which have received less research attention than marine settings. Researchers found that wastewater treatment plants are the most significant source of environmental microplastics through both sludge application and effluent discharge. The study highlights how microplastics move between land and water systems, enter food chains, and interact with both living organisms and soil chemistry.
The ubiquitous occurrences of microplastics in the environment have raised much concern and resulted in voluminous studies related to microplastics. Studies on microplastics pollution of the marine environment have received significantly higher attention compared to those of the freshwater and terrestrial environments. With the impetus to better understand microplastics in the freshwater and terrestrial environments, this review elucidates the findings of >100 articles related to the prevalence, fates and impacts of microplastics therein and the sustainable solutions, mostly in the past 10 years. This review shows the interconnection between terrestrial and freshwater microplastics with wastewater and sewage treatment plants as the most significant contributors of environmental microplastics via sludge and effluent discharges. Microplastics in both ecosystems comprise the primary and secondary forms with the latter resulted from weathering of the former. Besides retaining in soil and infiltrating with rainwater underground, terrestrial microplastics also enter the freshwater environment. The environmental microplastics interact with the biotic and abiotic components resulting in entrainment, settlement, biofouling, degradation, fragmentation and entry into the food chain, with subsequent transfer across the food chain. The abundance of environmental microplastics is attributed to population density and urbanization though tidal cycle, storms, floods and human activities can affect their distribution. The leaching of additives from microplastics poses major health concern and sustainable solutions target at reduction of plastics use and disposal, substitution with bioplastics and wastewater treatment innovations. Further studies on classification, detection, characterization and toxicity of microplastics are necessary to permit more effective formulation of solutions.
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Microplastics in freshwater and terrestrial environments: Evaluating the current understanding to identify the knowledge gaps and future research priorities
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This review evaluates the current understanding of microplastic pollution in freshwater and terrestrial environments, which have received far less research attention than marine systems despite being major sources and accumulation zones. Researchers highlight that agricultural areas, urban centers, and wastewater treatment processes are key pathways for microplastic contamination on land. The paper identifies critical knowledge gaps and calls for more research into how microplastics behave and persist in soils and freshwater systems.
Microplastics in wastewaters and their potential effects on aquatic and terrestrial biota
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This review of over 200 studies found that microplastics from wastewater are contaminating both aquatic and land environments, especially when treated wastewater or sewage sludge is used for irrigation. The microplastics can harm fish, soil organisms, plants, and microbial communities, and they serve as carriers for other toxic pollutants. The findings highlight that wastewater is a major pathway through which microplastics reach farmland and, ultimately, human food and drinking water.
Microplastics in Terrestrial and Freshwater Environments
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This review synthesized emerging research on microplastic contamination in terrestrial and freshwater environments, highlighting that land-based sources dominate plastic inputs to the ocean and that soil and freshwater ecosystems may harbor higher microplastic loads than marine environments.
Occurrence, Fate and Fluxes of Plastics and Microplastics in Terrestrial and Freshwater Ecosystems
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This review examines the occurrence, transport pathways, and fate of plastics and microplastics in terrestrial and freshwater ecosystems globally, synthesizing evidence that these systems are both sources and sinks and that microplastics cycle between compartments in complex ways.
A global review of microplastics in wastewater treatment plants: Understanding their occurrence, fate and impact
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A global review of 121 wastewater treatment plants found that microplastics are consistently present in both influent and effluent, with WWTPs acting as major conduits delivering plastics into aquatic and terrestrial ecosystems. While removal efficiencies varied widely, the sludge produced by these plants represents a concentrated secondary pathway for microplastic release to land.
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