Integrating eco-technological approach for textile dye effluent treatment and carbon dioxide capturing from unicellular microalga RDS03: a synergistic method.

A pilot-scale treatment method was used in the present study to test the biosorption of textile dye from textile effluent and carbon dioxide using RDS03. The textile dye effluent treatment achieved that textile dye biosorption capacity (q) rate of 98.84% on 15 days of treatment using RDS03. The Langmuir and Freundlich isotherm kinetics model indicated that the higher R value 0.98. The microalga RDS03 was captured-96.86% of CO analyzed by CO utilization and biofixation kinetics, 4.65 mgmL of biomass, 189.26 mgg of carbohydrate, 233.89 mgg of lipid, 4.3 mLg of bioethanol and 4.9 mLg of biodiesel produced. We performed fatty acid methyl ester (FAME) profiling using gas chromatography-mass spectrometry (GCMS). We found 40 types of biodiesel compounds, specifically myristic acid, pentadecanoic acid, octadecanoic acid, palmitic acid, and oleic acid. The high-performance liquid chromatography (HPLC) validated and analyzed the produced bioethanol.• Unicellular microalga RDS03 was isolated from the freshwater region and investigated their biosorption efficiency against hazardous synthetic azo textile dyes.• Chlorella vulgaris RDS03 ability to biosorption 96.86% of environmental polluted carbon dioxide• Treated biomass was used to produce ecofriendly, unpolluted and green energy such as biofuels (biodiesel and bioethanol).