| Title | Culturing Arthrospira maxima in mining wastewater: Pilot-scale culturing and biomass valorisation into C-phycocyanin and crude lipid extract |
|---|---|
| ID_Doc | 21797 |
| Authors | Blanco-Vieites, M; Casado, V; Battez, AH; Rodríguez, E |
| Title | Culturing Arthrospira maxima in mining wastewater: Pilot-scale culturing and biomass valorisation into C-phycocyanin and crude lipid extract |
| Year | 2023 |
| Published | |
| Abstract | Microalgae cultivation using wastewater as culture media offers a sustainable method for bioremediation that becomes a novel cost-effective tool when coupled to added - value products biorefinery. In this perspective, this work highlights the potential of Arthrospira maxima culturing as a new technique for highly sulphated wastewater (3,125 +/- 340 mg L-1) bioremediation at industrial scale. The influence of sulphate content on microalgal growth was evaluated and, simultaneously, sulphate bioremedi- ation rate was measured. Accordingly, microalgal biomass was separated from culture media for diluted sulphate content measurement through a turbidimetric procedure. The results indicate that A. maxima growth was not hindered when cultured in sulphated wastewater and significantly decreased the sulphate content within the first 6 days (50% of the initial sulphate content). The obtained biomass was valorised through the sequential extraction of C-phycocyanin, by a freeze-thaw method, and crude lipid ex- tract, through a solvent extraction method. Wastewater-cultured microalgae presented a higher phycocyanin production when compared to control group biomass, being the production yield (mg/g) 18.159 +/- 0.017 and 38.748 +/- 0.072, respectively. Crude lipid extraction assays showed that lipid content in A. maxima was not modified when exposed to high concentrations of sulphates. Accordingly, no significant difference was observed between control and experimental group lipidic extracts, achieving both groups close to a 7% of extraction yield. The results obtained confirm the hypothesis of using A. maxima industrial cultures for wastewater remediation along with the production of phycocyanin and crude lipid extract, which could be further valorised.(c) 2022 The Author(s). Published by Elsevier B.V.This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). |
| https://doi.org/10.1016/j.eti.2022.102978 |
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