Effect of metals on mesophilic anaerobic digestion of strawberry extrudate in batch mode. (15th January 2023)

• Record Type: Journal Article
• Authors: Cubero-Cardoso, Juan; Maluf Braga, Adriana Ferreira; Trujillo-Reyes, Ángeles; Alonso-Segovia, Gabriel; Serrano, Antonio; Borja, Rafael; Fermoso, Fernando G.
• Is Part Of: Journal of environmental management. Volume 326:Part B(2023)
• Publication Date: 2023-01-15
• Subjects: Waste valorisation -- Methane production -- Fractional factorial design -- Central composite design; Environmental policy -- Periodicals; Environmental management -- Periodicals; Environment -- Periodicals; Ecology -- Periodicals; 363.705
• DOI: 10.1016/j.jenvman.2022.116783
• Languages: English
• ISSNs: 0301-4797

Abstract

Abstract: According to recent studies, the anaerobic digestion of strawberry extrudate is a promising option with potential in the berry industry biorefinery. However, the lack and/or unbalance of concentrations of metals in some agro-industrial residues could hamper methane production during the anaerobic digestion of these kinds of wastes. In this study, a fractional factorial design was applied to screen the supplementation requirements regarding six metals (Co, Ni, Fe, Cu, Mn, and Zn) for methane production from strawberry extrudate (SE). The logistic model was used to fit the experimental data of methane production-time. It allowed identifying two different stages in the anaerobic process and obtaining the kinetic parameters for each step. Maximum methane production obtained in the first ( B max ) kinetic stage, the methane production in the second stage ( P ), and the maximum methane production rates ( R max ) concluded a statistically significant effect for Ni and Zn. The second set of experiments was carried out with Ni and Zn through a central composite design to study the concentration effect in the anaerobic digestion process of the strawberry extrudate. The parameters P and R max demonstrated a positive interaction between Ni and Zn. Although, B max did not prove a statistically significant effect between Ni and Zn. Graphical abstract: Image 1 Highlights: The metals addition improved the biomethanization of strawberry extrudate. Ni and Zn increased the maximum methane production rate at the tested range. Mn and Fe had a negative effect on methane production and rate. Co and Cu did not significantly affect methane production within the tested range.