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Article

Effect of the Substrate to Inoculum Ratios on the Kinetics of Biogas Production during the Mesophilic Anaerobic Digestion of Food Waste

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Resource Recovery Research Group (Re3G), Department of Environmental Science and Engineering, Kathmandu University, Dhulikhel 45200, Nepal
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Soil Water and Air Testing Laboratories Pvt. Ltd., GPO 25752, Babarmahal, Kathmandu 44600, Nepal
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Nawa Paila, Sisir-Marg-11, Babarmahal, Kathmandu 44600, Nepal
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EnergizeNepal, School of Engineering, Kathmandu University, Dhulikhel 45200, Nepal
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CIRCE-Research Centre for Energy Resources and Consumption (CIRCE Foundation—University of Zaragoza), Parque Empresarial Dinamiza, Avenida Ranillas 3D, 1a Planta, 50018 Zaragoza, Spain
*
Authors to whom correspondence should be addressed.
Academic Editor: Attilio Converti
Energies 2022, 15(3), 834; https://doi.org/10.3390/en15030834
Received: 23 December 2021 / Revised: 17 January 2022 / Accepted: 20 January 2022 / Published: 24 January 2022
This study evaluates the effects of the varying substrate to inoculum ratios (S:I) of 0.5, 1, 2, 3, 4, 5, and 6 (volatile solids/VS basis) on the kinetics of biogas production during batch mesophilic (35 ± 1 °C) anaerobic digestion (AD) of simulated food waste (FW), using anaerobic digestate as the inoculum. Kinetic parameters during biogas production (scrubbed with NaOH solution) are predicted by the first-order and the modified Gompertz model. The observed average specific biogas yields are in descending order corresponding to the S:I ratios 1, 2, 4, 6, 3, 5, and 0.5, respectively, and the significant effect of the S:I ratio was observed. The tests with the S:I of 1 have the maximum average biogas production rates of 88.56 NmL/gVS.d, whereas tests with the S:I of 6 exhibited the lowest production rates (24.61 NmL/gVS.d). The maximum biogas yields, predicted by the first order and the modified Gompertz model, are 668.65 NmL/gVS (experimental 674.40 ± 29.10 NmL/gVS) and 653.17 NmL/gVS, respectively. The modified Gompertz model has been proven to be suitable in predicting biogas production from FW. VS removal efficiency is greater in higher S:I ratios, with a maximum of 78.80 % at the S:I ratio of 6, supported by the longer incubation time. Moreover, a significant effect of the S:I ratio is seen on kinetics and energy recovery from the AD of FW. View Full-Text
Keywords: food waste; biogas; substrate to inoculum ratio; kinetic modeling; Gompertz model; volatile solids; energy recovery; first-order kinetics food waste; biogas; substrate to inoculum ratio; kinetic modeling; Gompertz model; volatile solids; energy recovery; first-order kinetics
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MDPI and ACS Style

Khadka, A.; Parajuli, A.; Dangol, S.; Thapa, B.; Sapkota, L.; Carmona-Martínez, A.A.; Ghimire, A. Effect of the Substrate to Inoculum Ratios on the Kinetics of Biogas Production during the Mesophilic Anaerobic Digestion of Food Waste. Energies 2022, 15, 834. https://doi.org/10.3390/en15030834

AMA Style

Khadka A, Parajuli A, Dangol S, Thapa B, Sapkota L, Carmona-Martínez AA, Ghimire A. Effect of the Substrate to Inoculum Ratios on the Kinetics of Biogas Production during the Mesophilic Anaerobic Digestion of Food Waste. Energies. 2022; 15(3):834. https://doi.org/10.3390/en15030834

Chicago/Turabian Style

Khadka, Aakash, Anmol Parajuli, Sheila Dangol, Bijay Thapa, Lokesh Sapkota, Alessandro A. Carmona-Martínez, and Anish Ghimire. 2022. "Effect of the Substrate to Inoculum Ratios on the Kinetics of Biogas Production during the Mesophilic Anaerobic Digestion of Food Waste" Energies 15, no. 3: 834. https://doi.org/10.3390/en15030834

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