This study investigates the potential of Spirulina platensis, a blue-green algae species, for the remediation of sewage wastewater, providing a sustainable approach to wastewater management. Over a 20-day period, with aeration at 3 L/min, Spirulina effectively reduced key pollutants, including chemical oxygen demand (COD), phosphate, nitrate, magnesium, and other impurities. Advanced analyses using FTIR, SEM, and EDX revealed that the primary mechanism of remediation was the adsorption of contaminants onto Spirulina. In addition, rapid photosynthetic growth under sunlight (200-400 μmol photons/m