Microalgae technology for polishing chemically-treated fish processing wastewater
Khalatbari, Saba; Sotaniemi, Ville-Hermanni; Suokas, Marko; Taipale, Sami; Leiviskä, Tiina (2024-01-05)
Elsevier
05.01.2024
Khalatbari, S., Sotaniemi, V.-H., Suokas, M., Taipale, S., & Leiviskä, T. (2024). Microalgae technology for polishing chemically-treated fish processing wastewater. Groundwater for Sustainable Development, 24, 101074. https://doi.org/10.1016/j.gsd.2023.101074
https://creativecommons.org/licenses/by/4.0/
© 2023 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
https://creativecommons.org/licenses/by/4.0/
© 2023 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
https://creativecommons.org/licenses/by/4.0/
Julkaisun pysyvä osoite on
https://urn.fi/URN:NBN:fi:oulu-202401181344
https://urn.fi/URN:NBN:fi:oulu-202401181344
Tiivistelmä
Abstract
The development of cost-effective treatment methods for nutrient-rich effluents is of great importance. In this study, microalgal-based technology was investigated as a final polishing stage for fish processing wastewater (FPWW) after fat and oil removal, with the purpose of facilitating wastewater reuse and nutrient recovery. First, the effect of FPWW filtration on the growth of two microalgal species (Chlorella sorokiniana and Selenastrum sp.) was investigated under batch mode. For both microalgae, the final biomass concentration and nutrient removal levels were higher in unfiltered FPWW than in filtered FPWW. Chlorella sorokiniana growth was notably greater than that of Selenastrum sp. Chlorella sorokiniana was further cultivated in a semi-continuous mode, which lead to stable microalgae growth and high nutrient uptake in unfiltered wastewater with no need to eliminate indigenous microorganisms and contamination. However, based on biochemical analysis, filtration increased the availability of essential fatty acids and carotenoids from Chlorella sorokiniana, thus increasing the commercial value of the algal biomass.
The development of cost-effective treatment methods for nutrient-rich effluents is of great importance. In this study, microalgal-based technology was investigated as a final polishing stage for fish processing wastewater (FPWW) after fat and oil removal, with the purpose of facilitating wastewater reuse and nutrient recovery. First, the effect of FPWW filtration on the growth of two microalgal species (Chlorella sorokiniana and Selenastrum sp.) was investigated under batch mode. For both microalgae, the final biomass concentration and nutrient removal levels were higher in unfiltered FPWW than in filtered FPWW. Chlorella sorokiniana growth was notably greater than that of Selenastrum sp. Chlorella sorokiniana was further cultivated in a semi-continuous mode, which lead to stable microalgae growth and high nutrient uptake in unfiltered wastewater with no need to eliminate indigenous microorganisms and contamination. However, based on biochemical analysis, filtration increased the availability of essential fatty acids and carotenoids from Chlorella sorokiniana, thus increasing the commercial value of the algal biomass.
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