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Effect of Mild-Temperature Thermo-Alkaline Pretreatment on the Solubilization and Anaerobic Digestion of Spent Coffee Grounds

Author

Listed:
  • Danbee Kim

    (School of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Eonyang-eup, Ulju-gun, Ulsan 44919, Korea)

  • Jaai Kim

    (School of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Eonyang-eup, Ulju-gun, Ulsan 44919, Korea)

  • Changsoo Lee

    (School of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology (UNIST), 50 UNIST-gil, Eonyang-eup, Ulju-gun, Ulsan 44919, Korea)

Abstract

Mild-temperature thermo-alkaline pretreatment of spent coffee grounds (SCG) was studied to improve its solubilization and methanation. The simultaneous effects of NaOH concentration (0–0.2 M) and temperature (60–90 °C) were investigated. Significant solubilization of SCG was achieved by the pretreatment, particularly under high-NaOH-concentration and high-temperature conditions. However, adding NaOH above a certain concentration adversely affected the methane production. Therefore, the degree of solubilization (SD) correlated poorly with methane yield (Ym). Response surface models of SD and Ym were successfully generated. The maximum response of SD (36.4%) was obtained at 0.18 M NaOH and 90.0 °C, while that of Ym (263.31 mL CH 4 /g COD added) was obtained at 0.13 M NaOH and 70.5 °C. Hydrogenotrophic Methanospirillum species were the dominant methanogens in all the SCG digestion tests. It is likely that NaOH concentration had a more significant influence on the development of microbial community structure, particularly of methanogens than temperature.

Suggested Citation

  • Danbee Kim & Jaai Kim & Changsoo Lee, 2018. "Effect of Mild-Temperature Thermo-Alkaline Pretreatment on the Solubilization and Anaerobic Digestion of Spent Coffee Grounds," Energies, MDPI, vol. 11(4), pages 1-14, April.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:4:p:865-:d:140068
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    Citations

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    Cited by:

    1. Battista, Federico & Barampouti, Elli Maria & Mai, Sofia & Bolzonella, David & Malamis, Dimitris & Moustakas, Konstantinos & Loizidou, Maria, 2020. "Added-value molecules recovery and biofuels production from spent coffee grounds," Renewable and Sustainable Energy Reviews, Elsevier, vol. 131(C).
    2. Minjeong Lee & Minseok Yang & Sangki Choi & Jingyeong Shin & Chanhyuk Park & Si-Kyung Cho & Young Mo Kim, 2019. "Sequential Production of Lignin, Fatty Acid Methyl Esters and Biogas from Spent Coffee Grounds via an Integrated Physicochemical and Biological Process," Energies, MDPI, vol. 12(12), pages 1-13, June.
    3. Adhirashree Vannarath & Arun Kumar Thalla, 2020. "Evaluation, ranking, and selection of pretreatment methods for the conversion of biomass to biogas using multi-criteria decision-making approach," Environment Systems and Decisions, Springer, vol. 40(4), pages 510-525, December.
    4. A. E. Atabani & Eyas Mahmoud & Muhammed Aslam & Salman Raza Naqvi & Dagmar Juchelková & Shashi Kant Bhatia & Irfan Anjum Badruddin & T. M. Yunus Khan & Anh Tuan Hoang & Petr Palacky, 2023. "Emerging potential of spent coffee ground valorization for fuel pellet production in a biorefinery," Environment, Development and Sustainability: A Multidisciplinary Approach to the Theory and Practice of Sustainable Development, Springer, vol. 25(8), pages 7585-7623, August.

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