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Effects of Nutrient Content and Nitrogen to Phosphorous Ratio on the Growth, Nutrient Removal and Desalination Properties of the Green Alga Coelastrum morus on a Laboratory Scale

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  • Aida Figler

    (Department of Hydrobiology, University of Debrecen, Egyetem Sqr. 1, H-4032 Debrecen, Hungary
    Pál Juhász-Nagy Doctoral School of Biology and Environmental Sciences, University of Debrecen, Egyetem Sqr. 1, H-4032 Debrecen, Hungary)

  • Kamilla Márton

    (Department of Hydrobiology, University of Debrecen, Egyetem Sqr. 1, H-4032 Debrecen, Hungary)

  • Viktória B-Béres

    (Department of Tisza Research, Institute of Aquatic Ecology, Centre for Ecological Research, Bem Sqr. 1, H-4026 Debrecen, Hungary)

  • István Bácsi

    (Department of Hydrobiology, University of Debrecen, Egyetem Sqr. 1, H-4032 Debrecen, Hungary)

Abstract

In wastewater, nutrient concentrations and salinity vary substantially, however, the optimal N:P ratio for the treatment using microalgae is not well described. In this study, the effects of higher and lower nitrate and phosphate contents and N:P ratios on growth, nutrient removal ability and halotolerance of the common green alga Coelastrum morus were investigated in model solutions. The results suggest that high nitrate content (above 100 mg L −1 ) with a similarly high phosphate concentration (resulting low N:P ratio) is not favorable for growth. The studied isolate can be considered as a halotolerant species, showing remarkable growth up to 1000 mg L −1 NaCl and it seems that despite the negative effects on growth, higher nutrient content contributes to higher halotolerance. A significant amount of nitrate removal was observed in media with different nutrient contents and N:P ratios with different salt concentrations. High N:P ratios favor phosphate removal, which is more inhibited by increasing NaCl concentration than nitrate uptake. Overall, with a relatively higher nutrient content and a favorable (5 or higher) N:P ratio, a common green algal species such as C. morus could be a promising candidate next to species from the Chlorellaceae and Scenedesmaceae families.

Suggested Citation

  • Aida Figler & Kamilla Márton & Viktória B-Béres & István Bácsi, 2021. "Effects of Nutrient Content and Nitrogen to Phosphorous Ratio on the Growth, Nutrient Removal and Desalination Properties of the Green Alga Coelastrum morus on a Laboratory Scale," Energies, MDPI, vol. 14(8), pages 1-16, April.
  • Handle: RePEc:gam:jeners:v:14:y:2021:i:8:p:2112-:d:533464
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    References listed on IDEAS

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    1. Safi, Carl & Zebib, Bachar & Merah, Othmane & Pontalier, Pierre-Yves & Vaca-Garcia, Carlos, 2014. "Morphology, composition, production, processing and applications of Chlorella vulgaris: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 35(C), pages 265-278.
    2. Ebrahimian, Atefeh & Kariminia, Hamid-Reza & Vosoughi, Manouchehr, 2014. "Lipid production in mixotrophic cultivation of Chlorella vulgaris in a mixture of primary and secondary municipal wastewater," Renewable Energy, Elsevier, vol. 71(C), pages 502-508.
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    Cited by:

    1. José C. M. Pires & Ana L. Gonçalves, 2022. "Microalgae Cultures: Environmental Tool and Bioenergy," Energies, MDPI, vol. 15(16), pages 1-4, August.

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