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Microalgae cultivation and carotenoid production in paint booth effluent mixed with domestic sewage

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Abstract

The paint booth effluent, generated during the painting and varnishing processes of wooden furniture, has a high content of solvents and suspended solids in its composition, being difficult to treat biologically and acting as a potential water pollutant. Thus, the present study aims to evaluate algal growth in culture media composed of paint booth effluent and domestic sewage mixed in eight different proportions. Microalgae growth was assessed in 400 mL flasks. The percentages (relative to the total flask volume) of paint booth effluent were 0%, 1%, 5%, 10%, 25%, 50%, 75%, and 100%, with the domestic sewage completing 100% of the total volume. The production of total carotenoids was also evaluated since stressful environments may enable the production of value-added pigments by microalgae. Volumes of 25% and 50% of paint booth effluent in the medium resulted in the highest concentrations of chlorophyll-α (3.0 and 2.3 mg/L, respectively) and total carotenoids (5.6 and 3.9 mg/L, respectively). The optimal volume of this effluent in the mixture was close to 40% (v/v). Regression analysis suggests that volumes above the optimal value can inhibit algae growth, possibly associated with lower nutrient availability and solvent toxicity. Therefore, it is possible to cultivate microalgae in paint booth effluent, especially when mixed with domestic sewage, which allows the adoption of a single, simple, and biological treatment system for both effluents produced in the furniture industries.

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Acknowledgements

The authors wish to thankfully acknowledge the financial support of The Minas Gerais Research Funding Foundation—FAPEMIG (grant number APQ-00114/2021).

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Contributions

MQB was contributed to conceptualization, methodology, roles/writing—original draft, data curation. LRdA was contributed to conceptualization, roles/writing—review and editing, data curation, formal analysis. JF was contributed to roles/writing—review and editing, data curation, validation. VJR was contributed to methodology, roles/writing—review and editing. MLC was contributed to funding acquisition, roles/writing—review and editing, supervision. PPA was contributed to conceptualization, funding acquisition, project administration, roles/writing—review and editing, supervision.

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Correspondence to M. Q. Braga.

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The authors declare that they have no conflict of interest.

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This article does not contain any studies with human participants or animals performed by any of the authors.

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Editorial responsibility: Hari Pant.

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Braga, M.Q., de Assis, L.R., Ferreira, J. et al. Microalgae cultivation and carotenoid production in paint booth effluent mixed with domestic sewage. Int. J. Environ. Sci. Technol. 21, 4075–4088 (2024). https://doi.org/10.1007/s13762-023-05268-y

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  • DOI: https://doi.org/10.1007/s13762-023-05268-y

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