The Nigerian paint industry faces a challenge managing organic-laden wastewater from manufacturing. This study explores an eco-friendly solution using Glycine max seed powder extract (GMA) as an organic bio-sorbent. GMA, a cost-effectiveness and high efficiency, was assessed for bio-sorption abilities, particularly in Chemical Oxygen Demand (COD) removal from paint industry effluent. Characterization techniques like FT-IR, and SEM-EDX were used for GMA analysis. Batch experiments, considering pH, initial COD, and contact time, identified optimal conditions at 4.0 g/l bio-sorbent dosage, pH 4.0, and 40.0-min settling time. The Langmuir isotherm model showed the best fit (correlation coefficient: 0.991), with a maximum adsorption capacity (qmax) of 101.01 mg/g. Kinetic models (Ho pseudo-second-order and Elovich) exhibited strong fitting (R2: 0.9847 and 0.9811, respectively). These results highlight GMA seed powder extract's efficacy as an eco-friendly alternative for COD removal in paint industry wastewater, offering a sustainable solution to enhance treatment processes and reduce COD levels efficiently.
