Enhancing biobased volatile fatty acids production from olive mill solid waste by optimization of pH and substrate to inoculum ratio.
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Data
2023
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The pH and substrate-to-inoculum ratio (S/I) are important parameters in the anaerobic
fermentation of agroindustrial residues, and therefore the optimization of these two parameters is
needed for a stable, efficient, and sustainable reactor operation. In this work, the parameters pH (5–9)
and S/I (0.5–3 gVS gVS−1
) were optimized to produce biobased volatile fatty acids (VFAs) from
hydrothermally pretreated olive mill solid waste (HPOMSW). The response variables evaluated in
the Doehlert design were total VFAs concentration (tVFAs) (mg L−1
) and amounts (%) of isobutyric,
butyric, isovaleric, and valeric acids on the VFAs profile. The pH was the variable that most influenced
the mixed culture fermentation of HPOMSW, proving to be a key parameter in the process. Microbial
community analyses of conditions 1 (S/I = 3 gVS gVS−1 and pH = 7) and 4 (S/I = 1.13 gVS gVS−1
and pH = 5) showed that Proteobacteria and Firmicutes accounted for more than 87% of the total
microorganisms identified for both conditions. In addition, the second-order model best fitted the
experimental data for the VFAs production at the desirable condition (S/I = 3 gVS gVS−1 and pH = 8).
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Biomass, Carboxylic acids, Anaerobic digestion, Microbial community, Kinetics
Citação
FONSECA, Y. A. da et al. Enhancing biobased volatile fatty acids production from olive mill solid waste by optimization of pH and substrate to inoculum ratio. Processes, v. 11, n. 2, artigo 338, 2023. Disponível em: <https://www.mdpi.com/2227-9717/11/2/338>. Acesso em: 01 ago. 2023.