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

Abstract

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 Chlorella vulgaris RDS03. The textile dye effluent treatment achieved that textile dye biosorption capacity (q_max) rate of 98.84% on 15 days of treatment using Chlorella vulgaris RDS03. The Langmuir and Freundlich isotherm kinetics model indicated that the higher R² value 0.98. The microalga Chlorella vulgaris RDS03 was captured-96.86% of CO₂ analyzed by CO₂ utilization and biofixation kinetics, 4.65 mgmL⁻¹ of biomass, 189.26 mgg⁻¹ of carbohydrate, 233.89 mgg⁻¹ of lipid, 4.3 mLg⁻¹ of bioethanol and 4.9 mLg⁻¹ 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.

Novelty of the Research

• Unicellular microalga Chlorella vulgaris 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)

Graphical Abstract

Keywords:

• Textile dye effluent
• RSM
• biosorption kinetics
• CO₂ capture
• pilot-scale
• bioethanol
• biodiesel
• GCMS
• HPLC

Acknowledgements

The authors have thanked the Department of Microbiology (Supported by DST-FIST), Periyar University for providing laboratory facilities and Vinayaka Missions Research Foundation (DU) for financial support (VMRF/Seed Money/Aug 2021/SAHS-Salem/1) for carrying out this research work.

Ethical approval

This research work does not contain any studies related with human or animals.

Disclosure statement

The authors declare that they have no conflicts of interests to disclose.

Correction Statement

This article has been corrected with minor changes. These changes do not impact the academic content of the article.

Additional information

Funding

The authors have thanked Vinayaka Missions Research Foundation (DU) for financial support [VMRF/Seed Money/Aug 2021/SAHS-Salem/1] for carrying out this research work.