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Adsorptive removal of organic pollutants from milk-processing industry effluents through chitosan-titanium dioxide nanoadsorbent-coated sand

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Abstract

Milk-processing industry effluent (MPIE) poses severe problems for aquatic and environmental systems, especially in the South Asian region. Therefore, its treatment is of great interest. This study deals with the investigation of chitosan titanium dioxide nanoadsorbent (CTiO2) coated onto sand particles via calcination that are used to remove the emerging pollutants. The adsorptive properties of these developed adsorbents are compared with those of the nascent sand without coating as well as with the chitosan titanium dioxide nanoadsorbent coated sand (CTiO2-CS). Batch adsorption experiments were performed to investigate the percent reduction efficiency (%RE) of organic pollutants in terms of biological oxygen demand (BOD) and chemical oxygen demand (COD) from synthetic and real effluents. The maximum %RE of BOD (96.76) and COD (98.91) was achieved at 1.5 M dose of CTiO2-CS, 120 min of contact time, pH 6.5, an initial BOD concentration of 900 mg/L, and an agitation speed of 400 rpm. Similarly, the %RE of COD was found to be 86.75 for synthetic effluent and 90.97 for real effluent at initial COD concentrations of 8000 mg/L. Pseudo-second-order and Langmuir models are found to be the best fits for BOD and COD adsorption. The diffusion model suggests that surface adsorption as well as intraparticle diffusion contribute to the actual adsorption process. Regeneration experiments were performed for four cycles, and CTiO2-CS was found to be the most regenerable adsorbent material. The performance of the adsorbent was compared with previous studies, and it was found to have excellent adsorption capacity. As a result, the developed filter bed could be used as a promising superadsorbent for the removal of organic load in MPIE.

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Acknowledgements

Author Dinesha B. L. gratefully thankful for Young Scientist award and financial supports from Department of Science and Technology Scheme for Young Scientists and Technologists (DST-SYST), Grant no. SP/YO/2019/1583(G), dated 27.05.2020, New Delhi. We also acknowledge Centre for Nanotechnology, College of Agricultural Engineering, UAS, Raichur, for laboratory facilities and their kind support.

Funding

Department of Science and Technology-Scheme for Young Scientists and Technologists (DST-SYST), Grant no. SP/YO/2019/1583(G), dated 27.05.2020.

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Conceptualization: Dinesha B. L., S. Hiregoudar and U.Nidoni; Data curation: Dinesha B. L., and V. Hiremath; Formal analysis: Dinesha B. L., and V. Hiremath; Funding acquisition: Dinesha B. L.; Investigation: Dinesha B. L. S. Hiregoudar and S. V. Ganachari; Methodology: Dinesha B. L.; Resources: Dinesha B. L., S. Hiregoudar, U.Nidoni, V. B. Patil and V. Hiremath; Supervision: Dinesha B. L. and S. Hiregoudar; Validation: Dinesha B. L., S. Hiregoudar, U.Nidoni, Visualization: Dinesha B. L. and S. V. Ganachari; Writing—original draft: Dinesha B. L.; Writing-review & editing: Dinesha B. L., S. Hiregoudar, U. Nidoni, S. V. Ganachari and V. B. Patil.

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Correspondence to Sharanabasava. V. Ganachari.

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Lingamurthy, D.B., Hiregoudar, S., Nidoni, U. et al. Adsorptive removal of organic pollutants from milk-processing industry effluents through chitosan-titanium dioxide nanoadsorbent-coated sand. Environ Sci Pollut Res 30, 24101–24119 (2023). https://doi.org/10.1007/s11356-022-23854-4

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