Textile Dye Biosorption onto Non-Living Freshwater Green Biomass: Influencing Factors and Its Efficiency. A Case Study (I)

This study discusses the experimental results (i.e. discoloration efficiency and Remazol Rosso RB dye removal) performed in application of a biosorption step for treatment of a simulated textile colored wastewater (WW) using dried non-living freshwater green algae-based materials (Spirogyra algae, size < 2 mm) as biosorbent in free form (S1) and after heating at 100°C for 6h (S2). Different influencing factors, i.e. pH, biosorbent dosage, dye concentration, temperature, biosorption time, were studied for finding the best operating conditions for highest discoloration and dye removal degrees. The results indicate that the dried green algal-based material is efficient as biosorbent (i.e. removals of dye and color in range of 64-91% by S1 biosorbent, and 54-85% by S2 biosorbent; mean biosorption capacity of 3.325 - 5.435 mg/g) and may be used in the textile WW treatment for decreasing the organic load and discoloration, especially in the case of frequent WW flowrate and chemical composition variation, when is working in the adequate operating conditions.