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Leachate from Non-Sanitary Waste Dumpsites as a Major Source of Microplastics: Identification, Characterization, and Ecological Risk Assessment
Summary
Researchers analyzed leachate from three uncontrolled waste dumpsites in Iran and found microplastic concentrations averaging up to 205 particles per liter, with polyamide and polypropylene as the dominant types and very high ecological risk scores. The study underscores how unregulated waste disposal in developing countries is a significant and underappreciated pathway for microplastics entering freshwater and soil environments.
A large amount of plastic produced globally ends up in municipal solid waste (MSW). In many developing countries, this waste is often dumped without control in urban and rural areas, mixed with other contaminated materials. Over time, these plastics break down into microplastics (MPs), which can enter the environment through landfill leachate. This study aimed to identify and characterize MPs in leachate from three old MSW dumpsites located in Khuzestan Province, southwest Iran. It also evaluated the ecological risk using the Polymer Hazard Index (PHI) and Pollution Load Index (PLI). The average concentrations of MPs at the dumpsites were 205, 111, and 157 items per liter. More than 50% of the MPs were smaller than 150 µm, and fragmented shapes were the most common (68.33%). Polyamide (68%) and polypropylene (16%) were identified as the dominant polymers in samples. The PHI values indicated high ecological risk, and the PLI values showed high to extremely high pollution levels. These results underline the serious environmental threat posed by MPs in leachate and stress the need for better waste management, including engineered landfills and waste segregation systems.