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Characteristics of Biogas Production from Organic Wastes Mixed at Optimal Ratios in an Anaerobic Co-Digestion Reactor

Author

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  • Young-Ju Song

    (Department of Environmental Energy Engineering Graduate School of Convergence Science, Seoul National University of Science and Technology, 232 Gongneung-ro, Nowon-gu, Seoul 01811, Korea)

  • Kyung-Su Oh

    (Department of Environmental Energy Engineering Graduate School of Convergence Science, Seoul National University of Science and Technology, 232 Gongneung-ro, Nowon-gu, Seoul 01811, Korea)

  • Beom Lee

    (Nature Engineering Co., Ltd., E-9, 1 Chungdae-ro, Seowon-gu, Cheongju-si 28644, Chungcheongbuk-do, Korea)

  • Dae-Won Pak

    (Department of Environmental Energy Engineering Graduate School of Convergence Science, Seoul National University of Science and Technology, 232 Gongneung-ro, Nowon-gu, Seoul 01811, Korea)

  • Ji-Hwan Cha

    (Department of Environmental Engineering, Chungbuk National University, Cheongju-si 28644, Chungcheongbuk-do, Korea)

  • Jun-Gyu Park

    (Department of Advanced Energy Engineering, Chosun University, 309 Pilmun-daero, Dong-gu, Gwangju 61452, Korea)

Abstract

This study determined the optimal mixing ratio of food waste and livestock manure for efficient co-digestion of sewage sludge by applying the biochemical methane potential (BMP) test, Design Expert software, and continuous reactor operation. The BMP test of sewage sludge revealed a maximum methane yield of 334 mL CH 4 /g volatile solids (VS) at an organic loading rate (OLR) of 4 kg VS/(m 3 ·d). For food waste, the maximum methane yield was 573 mL CH 4 /g VS at an OLR of 6 kg VS/(m 3 ·d). Livestock manure showed the lowest methane yield. The BMP tests with various mixing ratios confirmed that a higher mixing ratio of food waste resulted in a higher methane yield, which showed improved biodegradability and an improved VS removal rate. The optimal mixing ratio of 2:1:1 for sewage sludge, food waste, and livestock manure was determined using Design Expert 10. Using continuous co-digestion reactor operation under an optimal mixing ratio, greater organic matter removal and methane yield was possible. The process stability of co-digestion of optimally mixed substrate was improved compared with that of operations with each substrate alone. Therefore, co-digestion could properly maintain the balance of each stage of anaerobic digestion reactions by complementing the characteristics of each substrate under a higher OLR.

Suggested Citation

  • Young-Ju Song & Kyung-Su Oh & Beom Lee & Dae-Won Pak & Ji-Hwan Cha & Jun-Gyu Park, 2021. "Characteristics of Biogas Production from Organic Wastes Mixed at Optimal Ratios in an Anaerobic Co-Digestion Reactor," Energies, MDPI, vol. 14(20), pages 1-16, October.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:20:p:6812-:d:659201
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    References listed on IDEAS

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    1. Salehiyoun, Ahmad Reza & Di Maria, Francesco & Sharifi, Mohammad & Norouzi, Omid & Zilouei, Hamid & Aghbashlo, Mortaza, 2020. "Anaerobic co-digestion of sewage sludge and slaughterhouse waste in existing wastewater digesters," Renewable Energy, Elsevier, vol. 145(C), pages 2503-2509.
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    5. Ashton B. Mpofu & Victoria A. Kibangou & Walusungu M. Kaira & Oluwaseun O. Oyekola & Pamela J. Welz, 2021. "Anaerobic Co-Digestion of Tannery and Slaughterhouse Wastewater for Solids Reduction and Resource Recovery: Effect of Sulfate Concentration and Inoculum to Substrate Ratio," Energies, MDPI, vol. 14(9), pages 1-19, April.
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    1. Josipa Pavičić & Karolina Novak Mavar & Vladislav Brkić & Katarina Simon, 2022. "Biogas and Biomethane Production and Usage: Technology Development, Advantages and Challenges in Europe," Energies, MDPI, vol. 15(8), pages 1-28, April.
    2. Mykola Dyvak & Volodymyr Manzhula & Andriy Melnyk & Bohdan Rusyn & Iryna Spivak, 2024. "Modeling the Efficiency of Biogas Plants by Using an Interval Data Analysis Method," Energies, MDPI, vol. 17(14), pages 1-18, July.
    3. Luis G. Cortés & J. Barbancho & D. F. Larios & J. D. Marin-Batista & A. F. Mohedano & C. Portilla & M. A. de la Rubia, 2022. "Full-Scale Digesters: An Online Model Parameter Identification Strategy," Energies, MDPI, vol. 15(20), pages 1-17, October.
    4. Alberto Benato & Chiara D’Alpaos & Alarico Macor, 2022. "Possible Ways of Extending the Biogas Plants Lifespan after the Feed-In Tariff Expiration," Energies, MDPI, vol. 15(21), pages 1-23, October.
    5. Luis G. Cortés & J. Barbancho & D. F. Larios & J. D. Marin-Batista & A. F. Mohedano & C. Portilla & M. A. de la Rubia, 2022. "Full-Scale Digesters: Model Predictive Control with Online Kinetic Parameter Identification Strategy," Energies, MDPI, vol. 15(22), pages 1-23, November.

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