Textile dye wastewater treatment using freshwater algae in packed-bed reactor: modeling

Abstract

AbstractThe present study was conducted for the treatment of textile dye wastewater containing reactive dye and removal of reactive blue 19 from synthetic dye solution using freshwater algae (Spirulina platensis) in a packed-bed up-flow column. The breakthrough curves were drawn for various bed heights (5, 7.5, and 10 cm) and flow rates (4, 8, and 12 mL/min). Several models, namely bed depth service time (BDST) model, Thomas model, Adams–Bohart model, Wolborska model, Yoon–Nelson model, Yan et al. kinetic model, and modified dose-response model were engaged to illustrate the performance of the packed-bed sorption mechanism. BDST model explained the experimental mechanism very well. The breakthrough behavior was well reported by Thomas model and Yoon–Nelson model. The optimum bed height (10 cm) and flow rate (12 mL/min) yield maximum dye uptake (251.61 mg/g). The optimal conditions were adopted for the treatment of real textile dye effluent. The biomass S. platensis eliminates the chemical oxygen demand, c...