Valorization of lipid-rich wastewaters

Valorization of lipid-rich wastewaters: A theoretical analysis to tackle the competition between polyhydroxyalkanoate and triacylglyceride-storing populations

Argiz, Lucía (Universidade de Santiago de Compostela)
Correa-Galeote, David (Universidad de Granada)
Val del Río, Ángeles (Universidade de Santiago de Compostela)
Mosquera-Corral, Anuska (Universidade de Santiago de Compostela)
Gonzalez Cabaleiro, R. (TU Delft BT/Environmental Biotechnology)

2022

The lipid fraction of the effluents generated in several food-processing activities can be transformed into polyhydroxyalkanoates (PHAs) and triacylglycerides (TAGs), through open culture biotechnologies. Although competition between storing and non-storing populations in mixed microbial cultures (MMCs) has been widely studied, the right selective environment allowing for the robust enrichment of a community when different types of accumulators coexist is still not clear. In this research, comprehensive metabolic analyses of PHA and TAG synthesis and degradation, and concomitant respiration of external carbon, were used to understand and explain the changes observed in a laboratory-scale bioreactor fed with the lipid-rich fraction (mainly oleic acid) of a wastewater stream produced in the fish-canning industry. It was concluded that the mode of oxygen, carbon, and nitrogen supply determines the enrichment of the culture in specific populations, and hence the type of intracellular compounds preferentially accumulated. Coupled carbon and nitrogen feeding regime mainly selects for TAG producers whereas uncoupled feeding leads to PHA or TAG production function of the rate of carbon supply under specific aeration rates and feast and famine phases lengths.

Lipids
Metabolism
Microbial competition
Mixed microbial culture (MMC)
Polyhydroxyalkanoates (PHA)
Triacylglycerides (TAG)

http://resolver.tudelft.nl/uuid:685489f9-d876-4d6b-a506-5a6d2c1c6d61

https://doi.org/10.1016/j.scitotenv.2021.150761

2023-07-01

0048-9697

Science of the Total Environment, 807

Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.

Institutional Repository

journal article

© 2022 Lucía Argiz, David Correa-Galeote, Ángeles Val del Río, Anuska Mosquera-Corral, R. Gonzalez Cabaleiro