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Riverine Microplastics in South Africa: Unravelling Pollution Sources from Source to Sediment
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Scientists found high levels of tiny plastic particles called microplastics in two South African rivers, with the worst pollution coming from industrial areas and farms. These microscopic plastic pieces can end up in drinking water and the food chain, potentially affecting human health. The study shows that different human activities create different types of plastic pollution, which means we need targeted solutions to clean up our water sources.
Microplastics (MPs) are persistent environmental pollutants of growing concern, threatening aquatic ecosystems worldwide. This study examined the influence of different pollution sources on the abundance, types, and polymer composition of MPs in two South African river systems, the uMsunduzi and Swartskop Rivers. Surface water and sediment samples were collected from sites impacted by industrial, wastewater, agricultural, and urban activities. Both rivers showed high MP contamination, with the highest concentrations detected in industrial and agricultural zones. Fibers dominated the particle shapes, while polyethylene (PE) and polypropylene (PP) were the most common polymers, alongside site-specific contaminants such as polytetrafluoroethylene (PTFE). Sediments generally contained higher MP concentrations and smaller particles than surface waters. These findings highlight the role of land use in shaping MP pollution profiles and the need for targeted mitigation strategies to protect freshwater systems.
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Impact of pollution sources of microplastics and associated microbial populations in surface water
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Researchers examined how pollution sources—including wastewater treatment plants, agricultural areas, urban runoff, and industrial discharge—influence microplastic abundance and associated microbial communities in the uMsunduzi River in South Africa across two seasons.
Effects of urbanisation and a wastewater treatment plant on microplastic densities along a subtropical river system
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Researchers quantified microplastic pollution in sediments along a subtropical river system in southern Africa and examined how urbanization and wastewater treatment affect contamination levels. They found that microplastic densities were highest near urban areas and downstream of wastewater treatment plants. The study suggests that urban development and inadequate wastewater infrastructure are key drivers of freshwater microplastic pollution in the region.
Seasonal Abundance and Spatial Distribution of Microplastics in Water and Sediments of Tropical Urban–Agricultural River System; A Case of Ngerengere River, Tanzania
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Researchers found microplastics — tiny plastic fragments too small to easily see — in both the water and riverbed sediment of Tanzania's Ngerengere River, which flows through farms and urban areas before supplying water to nearby communities. This matters because rivers like this one are often used for drinking water, irrigating crops, and fishing, meaning these plastic particles could make their way into the food and water people consume every day. The study highlights that plastic pollution is a growing problem even in developing countries with limited water monitoring, underscoring the need for better waste management to protect both ecosystems and human health.
Source-specific Identification and Characterization of Microplastics in Urban Rivers of Surakarta, Indonesia
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Researchers traced tiny plastic particles (microplastics) found in urban rivers in Surakarta, Indonesia back to their likely sources, like trash, textiles, and personal care products. This matters because these rivers can be sources of drinking water and food (like fish), meaning the plastic pollution could eventually make its way into our bodies, understanding where it comes from is the first step to stopping it at the source.
Microplastic pollution in an anthropogenically modified river: sediment occurrence, associated microbiota, and environmental correlates
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Scientists studying a river affected by both cities and farms found that tiny plastic particles (most smaller than a grain of rice) weren't just linked to nearby land use, they were most strongly tied to direct signs of human activity, like traces of human DNA in the sediment. These plastic particles also carried bacteria, some with disease-causing potential, suggesting that pinpointing exact pollution sources, not just general urban vs. rural areas, may be key to reducing plastic contamination that could eventually affect drinking water and ecosystems humans depend on.
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