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doi: 10.18178/ijesd.2024.15.5.1490
Optimization and Kinetics of Anaerobic Digestion Processes for Three-phase Olive Mill Wastewater: Evaluation of Inoculum Performance and Determination of the Most Appropriate Choice
2Laboratory for the Improvement of Agricultural Protection, biotechnologies, and the Environment (LAPABE), Faculty of Sciences, Mohammed First University, Oujda, Morocco
Email: inass.hamdi@uit.ac.ma (I.H.); khadija.lihi@uit.ac.ma (K.L.); yahya.hameed.ye@gmail.com (H.S.A.Y.); nabila.auajjar@uit.ac.ma (N.A.); chafihafid@yahoo.fr (A.C.); attarassi.benaissa@uit.ac.ma (B.A.)
*Corresponding author
Abstract—This study is focused on optimizing the anaerobic digestion process of liquid waste generated by three-phase olive oil mills based on the effect of inoculum type and substrate-inoculum ratio on biogas production. For this purpose, we tested two of the best-known inoculum types (cow manure, and sewage sludge) by analyzing the variability of biogas production as a function of different substrate-inoculum ratios (SIR) in nine reactors (R1 to R9). The results, analyzed using the one-factor ANOVA test and Fisher‘s LSD post hoc test via SPSS, revealed significant differences between the ratios studied, with Reactor 4 (R4), which operates with sewage sludge as inoculum, representing the most interesting results. In addition, the application of the Gompertz kinetic model has enabled us to understand the effect of the substrate-inoculum ratio on the specific parameters of this model. A change in the substrate-inoculum ratio has an impact on the maximum specific biogas production (Rm), the maximum biogas production potential (A), and the lag phase (λ). These results have important consequences for sustainable waste management in the olive oil industry, as they offer indications as to the optimum operating conditions for the anaerobic digestion of olive mill wastewater.
Keywords—three-phase olive mill wastewater, Anaerobic digestion, Kinetics, Substrate-inoculum ratio, cow manure, sewage sludge.
Cite: Inass Hamdi, Khadija Lihi, Hameed Saleh Ali Yahya, Nabila Auajjar, Abdelhafid Chafi, and Benaissa Attarassi, "Optimization and Kinetics of Anaerobic Digestion Processes for Three-phase Olive Mill Wastewater: Evaluation of Inoculum Performance and Determination of the Most Appropriate Choice," International Journal of Environmental Science and Development vol. 15, no. 5, pp. 226-232, 2024.
Copyright © 2024 by the authors. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
