Characterisation of Power Plant Disposal Water from Two Distinct Regions in Bangladesh: A Comparative Assessment of Irrigation Feasibility

This study assesses the feasibility of using power plant disposal water for irrigation in Bangladesh, focussing on water from the Ashuganj and Ghorashal power plants. Addressing the need for sustainable water management in agriculture, particularly in water-scarce areas, the research explores the reuse of industrial disposal water. Thirty water samples from irrigation canals influenced by these plants were analysed for pH, electrical conductivity (EC), total dissolved solids, major ionic concentrations, and water quality indices, including a comprehensive irrigation water quality index (IWQI). Findings show pH levels of 6.1 to 7.7 at Ghorashal and 5.2 to 7.1 at Ashuganj, with Ghorashal displaying higher salinity (EC, 289.3 to 356.9 μS cm^-1) compared to Ashuganj (123.4 to 179 μS cm^-1). Calcium levels were significantly higher at Ghorashal (157-201 mg L^-1) than at Ashuganj (60.98-97.12 mg L^-1). Both sites demonstrated chemical suitability for irrigation, with IWQI values classifying their water as “excellent” for agricultural use. Ghorashal’s higher salinity and sodium levels require careful management to prevent soil degradation, while Ashuganj’s water shows lower risks of soil alkalization or acidification. The study underscores the need for region-specific water management strategies and contributes empirical data supporting sustainable agricultural practices and informed policy-making.