Response Surface Methodology for Predicting COD and Colour Decrease Real-time textile wastewater ozonation by adsorption upon activated Canna Indica biochar

Textile effluent comprises Colours, heavy metals, and other chemicals. Before discharge into waterways, Colour and COD should be reduced. This research used Canna Indica biochar adsorption and Ozonation to reduce COD and remove Colour. The effects of adsorbent dose, solution pH, contact duration, activating agent, and ozonation rate on COD reduction and Colour removal were examined. Potassium hydroxide-treated Canna Indica (KBC) reduced COD by 96.90% at 2.5 g/L, 8 pH, 17 hr, and 100 mL/min at ambient conditions, while sodium hydroxide-treated biochar (NBC) removed Colour at 2.5 g/L, pH 8.5, 17 hours, and 57.5 mL/min. This research found pseudo-second-order biochar adsorption in textile effluent. Chemical sorption was dominant for textile wastewater COD and Colour removal. Order of significance: pH > adsorbent dose > contact duration > ozonation rate. KBC and NBC had maximal adsorption capacities of 357.14 mg/g and 333.33 mg/g, respectively. According to the RSM-BBD study, pH was crucial for COD and Colour removal via adsorption and ozonation. Ordering R2 isotherms according to significance Langmuir > Temkin > Redlich-Peterson > Freundlich = Halsey > Dubinin-Radushkevich for KBC and NBC. Response Surface Methodology predicts COD and Colour reduction. Approach utilizing real-time textile dye wastewater adsorption upon activated Canna Indica charcoal and ozonation