Application of Extracellular Polymeric Substances Extracted from Wastewater Sludge for Reactive Dye Removal

This study aimed to investigate the adsorption of three commercial reactive dyes using extracellular polymeric substances (EPS) extracted from waste sludge a beer wastewater treatment plant in Hanoi, Vietnam. EPS was by HCHO-NaOH method and characterized measuring kaolin flocculation activity, dry weight, chemical composition, functional groups. Adsorption on conducted Jartest at different pH values, contact times, dosages. The composed 25% weight. FTIR analysis showed presence amine carboxyl groups structure. removal efficiencies were high values below 6, time 30 60 min, dosage 200 – 250 mg/L. At optimum condition, 85%, 99%, 99% obtained for Reactive Yellow 176 (RY 176), Blue 21 (RB 21), Red 241 (RR 241), respectively. process could be described both Langmuir Freundlich models. maximum dye capacities RY 176, RB 21, RR 0.50 g/g, 0.72 0.95 It is concluded that utilized as an effective adsorbent removal, thereby enhancing value treatment. • used removal. Removal 99%. capacity less than 6.