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

Author

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  • Aakash Khadka

    (Resource Recovery Research Group (Re3G), Department of Environmental Science and Engineering, Kathmandu University, Dhulikhel 45200, Nepal
    Soil Water and Air Testing Laboratories Pvt. Ltd., GPO 25752, Babarmahal, Kathmandu 44600, Nepal)

  • Anmol Parajuli

    (Resource Recovery Research Group (Re3G), Department of Environmental Science and Engineering, Kathmandu University, Dhulikhel 45200, Nepal)

  • Sheila Dangol

    (Nawa Paila, Sisir-Marg-11, Babarmahal, Kathmandu 44600, Nepal)

  • Bijay Thapa

    (Nawa Paila, Sisir-Marg-11, Babarmahal, Kathmandu 44600, Nepal
    EnergizeNepal, School of Engineering, Kathmandu University, Dhulikhel 45200, Nepal)

  • Lokesh Sapkota

    (Soil Water and Air Testing Laboratories Pvt. Ltd., GPO 25752, Babarmahal, Kathmandu 44600, Nepal
    Nawa Paila, Sisir-Marg-11, Babarmahal, Kathmandu 44600, Nepal)

  • Alessandro A. Carmona-Martínez

    (CIRCE-Research Centre for Energy Resources and Consumption (CIRCE Foundation—University of Zaragoza), Parque Empresarial Dinamiza, Avenida Ranillas 3D, 1a Planta, 50018 Zaragoza, Spain)

  • Anish Ghimire

    (Resource Recovery Research Group (Re3G), Department of Environmental Science and Engineering, Kathmandu University, Dhulikhel 45200, Nepal)

Abstract

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.

Suggested Citation

  • Aakash Khadka & Anmol Parajuli & Sheila Dangol & Bijay Thapa & Lokesh Sapkota & Alessandro A. Carmona-Martínez & 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, MDPI, vol. 15(3), pages 1-16, January.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:3:p:834-:d:732109
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    1. Chen, Yinguang & Luo, Jingyang & Yan, Yuanyuan & Feng, Leiyu, 2013. "Enhanced production of short-chain fatty acid by co-fermentation of waste activated sludge and kitchen waste under alkaline conditions and its application to microbial fuel cells," Applied Energy, Elsevier, vol. 102(C), pages 1197-1204.
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    2. Kim, Gi-Beom & Cayetano, Roent Dune A. & Park, Jungsu & Jo, Yura & Park, Soyoung & Ersahin, Mustafa Evren & Kim, Sang-Hyoun, 2024. "Effects of solids concentration and thermal pretreatment on continuous digestion of undigested dewatered sludge," Renewable Energy, Elsevier, vol. 231(C).
    3. Alessandro A. Carmona-Martínez & Carmen Bartolomé & Clara A. Jarauta-Córdoba, 2023. "The Role of Biogas and Biomethane as Renewable Gases in the Decarbonization Pathway to Zero Emissions," Energies, MDPI, vol. 16(17), pages 1-3, August.
    4. Michele Ponzelli & Hiep Nguyen & Jörg E. Drewes & Konrad Koch, 2023. "Improved Recovery of Overloaded Anaerobic Batch Reactors by Graphene Oxide," Sustainability, MDPI, vol. 15(3), pages 1-17, January.
    5. Amal Babu Puthumana & Prasad Kaparaju, 2024. "Impact of Organic Load on Methane Yields and Kinetics during Anaerobic Digestion of Sugarcane Bagasse: Optimal Feed-to-Inoculum Ratio and Total Solids of Reactor Working Volume," Energies, MDPI, vol. 17(20), pages 1-18, October.
    6. Bi, Shaojie & Wang, Chunshuang & Wang, Haipeng & Du, Yanli & Yu, Xinhui & Wang, Yanjie, 2024. "Comparison of mesophilic and thermophilic anaerobic digestion of food waste: Focusing on methanogenic performance and pathogens removal," Renewable Energy, Elsevier, vol. 233(C).
    7. Parralejo Alcobendas Ana Isabel & Royano Barroso Luis & Cabanillas Patilla Juan & González Cortés Jerónimo, 2022. "Biogas from Nitrogen-Rich Biomass as an Alternative to Animal Manure Co-Substrate in Anaerobic Co-Digestion Processes," Energies, MDPI, vol. 15(16), pages 1-13, August.
    8. Ephodia Sihlangu & Dibungi Luseba & Thierry Regnier & Primrose Magama & Idan Chiyanzu & Khathutshelo Agree Nephawe, 2024. "Investigating Methane, Carbon Dioxide, Ammonia, and Hydrogen Sulphide Content in Agricultural Waste during Biogas Production," Sustainability, MDPI, vol. 16(12), pages 1-29, June.
    9. Amina Mohamed Ali & Md Alam Zahangir & Fatouma Mohamed Abdoul-Latif & Mohammed Saedi Jami & Jalludin Mohamed & Tarik Ainane, 2023. "Hydrolysis of Food Waste with Immobilized Biofilm as a Pretreatment Method for the Enhancement of Biogas Production," Sustainability, MDPI, vol. 15(4), pages 1-17, February.
    10. Shitophyta Lukhi Mulia & Arnita Arnita & Wulansari Hilda Dyah Ana, 2023. "Evaluation and modelling of biogas production from batch anaerobic digestion of corn stover with oxalic acid," Research in Agricultural Engineering, Czech Academy of Agricultural Sciences, vol. 69(3), pages 151-157.
    11. M. Devendran Manogaran & Mohd Hakimi & Mohammad Harith Nizam Basheer Ahmad & Rashid Shamsuddin & Jun Wei Lim & Muzamil Abdalla M Hassan & Nurul Tasnim Sahrin, 2023. "Effect of Temperature on Co-Anaerobic Digestion of Chicken Manure and Empty Fruit Bunch: A Kinetic Parametric Study," Sustainability, MDPI, vol. 15(7), pages 1-11, March.
    12. Agnieszka A. Pilarska & Tomasz Kulupa & Adrianna Kubiak & Agnieszka Wolna-Maruwka & Krzysztof Pilarski & Alicja Niewiadomska, 2023. "Anaerobic Digestion of Food Waste—A Short Review," Energies, MDPI, vol. 16(15), pages 1-23, August.

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