Permanganate Aerobic oxidation of Drimarene Blue-HFRL under diverse pH and impact on Chemical oxygen demand of the dye wastewater

This study aimed to explore the oxidation kinetics of reactive Drimaren Blue-HFRL (DB-HFRL), leading to its degradation by permanganate ions under diverse pH conditions at λ_max610nm using a spectrophotometer. The oxidation reaction of DB-HFRL was observed on several parameters in acidic and alkaline solutions, such as dye and potassium permanganate (KMnO₄) dosage, pH, reaction time, and temperature. The oxidative products were analyzed through IR spectroscopy, followed by the determination of chemical oxygen demand (COD) and biological oxygen demand(BOD) of reaction mixtures. The change in pH on the oxidation capability of KMnO₄ was monitored under mono, di, and tri protic acids and an alkaline medium. Results showed that oxidation leading to degradation was higher at low pH compared to higher pH. The percent decolorization/ oxidation of dye waste effluent was rapid at higher concentrations of KMnO₄ in the presence of different acids such as CH₃COOH, H₂SO_4,and H₃PO₄ (76.19%) while minimum in alkaline medium (17.19%). It was observed that the dye decolorization rate was directly proportional to the hydrogen ion concentration in a given acidic medium (tri-protic acid, H₃PO₄). This indicates that H ions are significant in dye colour removal and renovation of wastewater. COD of the laboratory scale prepared wastewater (4500mg/L) showed the effectiveness of the developed process where a remarkable decline in chemical oxygen demand (COD) was observed in an acidic medium. This study establishes a cost-effective method to treat textile effluent to protect the ecosystem.