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Urban drainage channels as microplastics pollution hotspots in developing areas: A case study in Da Nang, Vietnam
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An urban drainage channel in Da Nang, Vietnam receiving domestic wastewater and landfill leachate was identified as a microplastic hotspot, with high concentrations of diverse plastic types reflecting both household and industrial sources. The study highlights drainage infrastructure in rapidly developing Asian cities as significant conduits for microplastic transport to coastal waters.
This study provides information on the current situation of microplastics contamination in inland freshwater bodies in Vietnam. An urban drainage channel in Da Nang City was selected as a case study. Receiving mainly domestic wastewater and landfill leachate, the channel itself is becoming a microplastic pollution hotspot with a microplastic concentration of 1482.0 ± 1060.4 items m in waters and 6120.0 ± 2145.7 items kg in sediments. The dominant shapes of microplastics were fibers and fragments, in which the polymer types were mainly polyethylene, polypropylene, and polyethylene terephthalate. Microplastics with sizes ranging from 1000 to 5000 μm tended to be distributed primarily in surface waters, whereas particles from 300 to 1000 μm accumulated in sediments. The channel places Da Nang Bay at a high risk for microplastic pollution, with an estimated pollution load of approximately 623 × 10 items d in dry weather.
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