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Valorization of organic rich saline streams by purple phototrophic bacteria mixed cultures through polyhydroxyalkanoates production
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Orientador(es)
Resumo(s)
Saline wastewaters rich in organic compounds present significant disposal management challenges. A cost-effective alternative to expensive treatment methods is their utilization as feedstock for polyhydroxyalkanoates (PHA) production, a biodegradable substitute for traditional plastics, using purple phototrophic bacteria (PPB). This study evaluates the feasibility of using PPB mixed cultures for PHA production under near-seawater salinity conditions (30gNaCl.L−1), using a synthetic volatile fatty acid mixture comprising C2 to C5 chain lengths. A highly enriched PPB mixed culture (>95 % abundance) was obtained, attaining a PHA content of 24 ± 4 % and a productivity of 0.14 ± 0.02 gPHA.L−1.day−1. Batch assays demonstrated that increased light exposure and continuous availability of C3 to C5 volatile fatty acids enhanced PHA productivity, whereas osmotic shock (45gNaCl.L−1) negatively impacted PHA production. The obtained PHA productivities align with those reported in non-saline conditions, highlighting the PPB potential for valorizing saline wastewaters through PHA production, within a circular economy framework.
Descrição
Funding Information:
This work was supported by national funds from FCT - Fundação para a Ciência e a Tecnologia, I.P., in the scope of the project UIDP/04378/2020 (DOI: 10.54499/UIDP/04378/2020) and UIDB/04378/2020 (DOI: 10.54499/UIDB/04378/2020), of the Research Unit on Applied Molecular Biosciences - UCIBIO and the project LA/P/0140/2020 (DOI: 10.54499/LA/P/0140/2020) of the Associate Laboratory Institute for Health and Bioeconomy - i4HB. J.C. also acknowledges the financial support of FCT - Fundação para a Ciência e a Tecnologia, I.P., through the Ph.D. grant UI/BD/151169/2021.
© 2025 The Author(s). Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
Palavras-chave
Circular economy Osmotic stress Polyhydroxyalkanoates (PHA) production Purple phototrophic bacteria (PPB) Saline wastewater valorization Volatile fatty acids (VFA)