24, using 100 mg/L Congo red dye, 200 mg/L Pb 2+, 3 g/L algal biomass, initial pH 6 and contact time was 120 min at 30 ☌. The highest removal percentages of Congo red dye (97.89%) and Pb 2+ (98.78%) were achieved in the run no. The process variables effects on Congo red dye and Pb 2+ removal percentages were explored by performing 50 experiments using Face-centered central composite design. Biosorption capacity of Ulva lactuca biomass was assessed in batch experiments for simultaneous removal of Pb 2+ and Congo red dye from binary solution. Heavy metals are also the largest group of inorganic pollutants due to their accumulation in the environment, contaminate food chains and cause adverse effects on the living organisms. Dyes constitute an important group of organic contaminants and are recognized for its harmful effects on the aquatic environments and humans.
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