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Valorization of organic rich saline streams by purple phototrophic bacteria mixed cultures through polyhydroxyalkanoates production
Publication . Carvalho, João M.; Marreiros, Bruno C.; Gaudêncio, Susana P.; Fradinho, Joana C.; DQ - Departamento de Química; UCIBIO - Applied Molecular Biosciences Unit; Elsevier
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.
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Fundação para a Ciência e a Tecnologia
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OE
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UI/BD/151169/2021