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Industrial Wastewater and Its Ecotoxicological Impact on Aquatic Life in Bangladesh: A Contemporary Review
Summary
Industrial wastewater from textile, tannery, and pharmaceutical sectors in Bangladesh is causing severe ecotoxicological damage to freshwater ecosystems, with heavy metals bioaccumulating in fish and emerging pollutants including microplastics and PFAS exacerbating organismal harm and acting as vectors for additional toxins. This review highlights how industrial microplastic discharge compounds aquatic toxicity in developing nations where regulatory enforcement remains inadequate.
The rapid industrialization of Bangladesh, a cornerstone of its economic growth, has precipitated a severe water pollution crisis, posing critical threats to freshwater ecosystems. This review synthesizes current evidence on the composition, sources, and ecotoxicological consequences of industrial wastewater, highlighting major regulatory and management challenges. The textile, tannery, food processing, paper, and pharmaceutical sectors are identified as primary polluters, collectively responsible for over 97% of industrial water pollution. Their effluents consistently exceed national standards, containing alarming levels of heavy metals (e.g., Pb, Cd, Cr), organic pollutants, and elevated physicochemical parameters (BOD, COD, TDS, TSS). Geographically, hotspots include Dhaka, Chittagong, and Gazipur, where untreated discharges lead to biodiversity loss and sediment contamination. The ecotoxicological impacts are profound and multi-faceted. Heavy metals bioaccumulate, causing oxidative stress, organ damage, reproductive failure, and mortality in key fish species like Labeo rohita and Oreochromis niloticus. Organic loads and physicochemical stressors deplete oxygen, alter pH, and induce physiological stress. Emerging pollutants, particularly microplastics and PFAS, exacerbate risks by impairing organismal health and acting as vectors for other toxins. Despite regulatory frameworks like the Environmental Conservation Act (1995), effective mitigation is hampered by weak enforcement, corruption, and the high cost of treatment technologies, especially for SMEs. Many Effluent Treatment Plants (ETPs) remain non-functional or inefficient. The review concludes that safeguarding aquatic ecosystems requires an integrated strategy combining stringent regulatory enforcement, adoption of advanced and cost-effective treatment technologies, capacity building, updated standards for emerging contaminants, and targeted research. Coordinated action among government, industry, and communities is imperative to ensure the health of Bangladesh’s water resources and the populations that depend on them.