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Polyhydroxyalkanoates Production by Mixed Microbial Culture under High Salinity

Author

Listed:
  • João M. Carvalho

    (UCIBIO—Applied Molecular Biosciences Unit, Department of Chemistry, NOVA School of Science and Technology, NOVA University Lisbon, 2819-516 Caparica, Portugal
    Associate Laboratory i4HB—Institute for Health and Bioeconomy, NOVA School of Science and Technology, NOVA University Lisbon, 2819-516 Caparica, Portugal)

  • Bruno C. Marreiros

    (UCIBIO—Applied Molecular Biosciences Unit, Department of Chemistry, NOVA School of Science and Technology, NOVA University Lisbon, 2819-516 Caparica, Portugal
    Associate Laboratory i4HB—Institute for Health and Bioeconomy, NOVA School of Science and Technology, NOVA University Lisbon, 2819-516 Caparica, Portugal)

  • Maria A. M. Reis

    (UCIBIO—Applied Molecular Biosciences Unit, Department of Chemistry, NOVA School of Science and Technology, NOVA University Lisbon, 2819-516 Caparica, Portugal
    Associate Laboratory i4HB—Institute for Health and Bioeconomy, NOVA School of Science and Technology, NOVA University Lisbon, 2819-516 Caparica, Portugal)

Abstract

The fishing industry produces vast amounts of saline organic side streams that require adequate treatment and disposal. The bioconversion of saline resources into value-added products, such as biodegradable polyhydroxyalkanoates (PHAs), has not yet been fully explored. This study investigated PHA production by mixed microbial cultures under 30 g NaCl /L, the highest NaCl concentration reported for the acclimatization of a PHA-accumulating mixed microbial culture (MMC). The operational conditions used during the culture-selection stage resulted in an enriched PHA-accumulating culture dominated by the Rhodobacteraceae family (95.2%) and capable of storing PHAs up to 84.1% wt. (volatile suspended solids (VSS) basis) for the highest organic loading rate (OLR) applied (120 Cmmol/(L.d)). This culture presented a higher preference for the consumption of valeric acid (0.23 ± 0.03 Cmol HVal /(Cmol X .h)), and the 3HV monomer polymerization (0.33 ± 0.04 Cmmol HV /(Cmmol X .h) was higher as well. As result, a P(3HB-co-3HV)) with high HV content (63% wt.) was produced in the accumulation tests conducted at higher OLRs and with 30 g NaCl /L. A global volumetric PHA productivity of 0.77 gPHA/(L.h) and a specific PHA productivity of 0.21 gPHA/(gX.h) were achieved. These results suggested the significant potential of the bioconversion of saline resources into value-added products, such as PHAs.

Suggested Citation

  • João M. Carvalho & Bruno C. Marreiros & Maria A. M. Reis, 2022. "Polyhydroxyalkanoates Production by Mixed Microbial Culture under High Salinity," Sustainability, MDPI, vol. 14(3), pages 1-15, January.
    • Handle: RePEc:gam:jsusta:v:14:y:2022:i:3:p:1346-:d:733427
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    References listed on IDEAS

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    1. Yun Chen Ching & Ghufran Redzwan, 2017. "Biological Treatment of Fish Processing Saline Wastewater for Reuse as Liquid Fertilizer," Sustainability, MDPI, vol. 9(7), pages 1-26, June.
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