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Characterization of microplastics in an industrial wastewater treatment plant: sector-specific loads, removal efficiency, and contaminant associations
Summary
Researchers studying an industrial wastewater plant in Iran found that even though it filters out roughly 76-90% of microplastic particles, it still releases hundreds of millions of tiny plastic bits into waterways every day, mostly from textile and cellulose factories. Even more concerning, these microplastics had heavy metals like cadmium and zinc stuck to their surfaces, meaning they can act as "hitchhikers" that carry toxic substances further into rivers, soil, and potentially our food and water supply. This suggests that simply treating wastewater at the end of the pipe isn't enough, factories need targeted solut
Microplastics (MPs) pollution is an escalating global environmental concern, yet detailed data on specific MP loads from diverse industrial sectors in developing regions remains scarce. This study conducts a comprehensive, sector-specific investigation of MP characteristics and concentrations across seven distinct industrial effluents in Iran's largest industrial zone. An optimized high-density separation method (ZnCl 2 , 1.71 ∼ g/cm 3 ) was utilized, alongside optical microscopy, Raman spectroscopy, and SEM-EDX analysis. The Industrial Wastewater Treatment Plants (IWWTPs) exhibited statistically significant seasonal variations in influent MP concentrations (649 ± 21 MPs/L wet vas. 545 ± 18 MPs/L). Consequently, removal efficiencies reached 89.9% and 75.5% during the dry and wet seasons, respectively. Sector-specific analysis revealed the highest MP emissions in cellulose and textile effluents, while pharmaceutical and foundry units discharged the lowest. Transparent fibers and fragments were dominant, primarily confirmed as low-density polyethylene (LDPE) and polypropylene (PP). Crucially, SEM-EDX confirmed the surface adsorption of multiple heavy metals (e.g., Cd, Mo, Ti, Zn), demonstrating MPs acting as potential vectors. Despite high removal rates, the IWWTP continuously discharges 1.65 × 10 8 to 4.77 × 10 8 MPs/day, with 9.947 × 10 8 MPs accumulating in sludge annually (dry weight). By establishing these first-of-their-kind source-specific emission profiles, this study highlights the urgent necessity for targeted, sector-based mitigation strategies rather than relying solely on generic end-of-pipe treatments.