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Assessing the Health of Karnaphuli River, Bangladesh: A Comprehensive Study of Macro Plastic Pollution, Water Quality, and Community Perspectives
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This multidisciplinary study of the Karnaphuli River in Bangladesh found strong correlations between organic pollution indicators (BOD and COD) and identified urban and commercial zones as dominant contributors to macro plastic accumulation. A community survey revealed that while most residents were aware of river pollution, only a small fraction recognized health risks or trusted government responses, underscoring the need for improved waste management and public education.
Background: Plastic pollution has emerged as a critical environmental challenge in riverine ecosystems, particularly in rapidly urbanizing regions.The Karnaphuli River, a vital waterway in southeastern Bangladesh, faces escalating pollution pressures from industrial, residential, and commercial sources.Understanding the magnitude, sources, and community perception of this issue is essential for effective management and policy intervention.Materials and Methods: This study employed a multidisciplinary approach combining fieldbased macro plastic collection from six strategically selected sites, water quality analysis, and a structured survey of 150 local residents.The sites represented varying pollution sources, including industrial, urban, and commercial zones.Statistical analyses were performed to identify relationships among physicochemical parameters, and thematic analysis was used to interpret community responses.Results: A strong and statistically significant correlation was found between biochemical oxygen demand (BOD) and chemical oxygen demand (COD) (r = 0.951, p = 0.004), suggesting high levels of organic pollution.Urban and commercial zones were the dominant contributors to macro plastic accumulation.Survey findings indicated that while 80.8% of respondents were aware of river pollution, only 38% recognized associated health risks, and merely 6% expressed confidence in government actions.Key pollution sources included household waste, market runoff, and pluvial flow during rainfall events. Conclusion:The study underscores the urgent need for targeted policy reforms, improved municipal waste management systems, and enhanced public environmental awareness.These findings contribute valuable insights for sustainable river management and plastic pollution mitigation strategies in South Asia.
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Researchers found high concentrations of microplastics in the surface water and sediments of Bangladesh's Karnaphuli River, with downstream areas showing the greatest abundance, fibers as the dominant type, and polyethylene terephthalate as the most common polymer.
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Surface water samples from ten stations in Bangladesh's Karnaphuli estuary revealed widespread microplastic contamination dominated by fibers (86%) from industrial, agricultural, and urban sources. Risk indices classified pollution as significant across all stations, with some showing very high potential risk scores. As a densely populated coastal estuary receiving industrial effluents and urban runoff, the Karnaphuli serves as an important case study for microplastic monitoring in South Asian waterways that feed into the Bay of Bengal.
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This review combined 15 existing studies on tiny plastic particles in Bangladesh's Karnaphuli River, found in water, sediment, fish, and fishery products. Likely sources include industrial and household wastewater, textile discharge, and plastic waste, though this is not firmly proven. The review notes gaps in standardized testing methods and limited data on local fish and human exposure through diet.
Microplastic pollution in two industrial locations of the Karnaphuli River, Bangladesh: insights on abundance, types, and characteristics
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Researchers surveyed microplastic pollution in surface water at two industrial sites along the Karnaphuli River in Bangladesh, finding significant contamination with fibers being the most common type. The study suggests that industrial activity is a major contributor to microplastic pollution in this river system, with polymer types and concentrations varying between the two locations.
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Researchers assessed the spatial and seasonal distribution of microplastics along the Karnaphuli River in Chattogram, Bangladesh. Microplastic concentrations were higher in sediment than surface water and elevated in downstream locations, with fibers and fragments of PET, polyethylene, and polystyrene being the most common types, and the ecological risk assessment rated the pollution as Category I, indicating a significant pollution load.
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