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Sequential Production of Lignin, Fatty Acid Methyl Esters and Biogas from Spent Coffee Grounds via an Integrated Physicochemical and Biological Process

Author

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  • Minjeong Lee

    (School of Earth Sciences and Environmental Engineering, Gwangju Institute of Science and Technology (GIST), Buk-gu, Gwangju 61005, Korea
    These authors contributed equally to this work and should be considered co-first authors.)

  • Minseok Yang

    (School of Earth Sciences and Environmental Engineering, Gwangju Institute of Science and Technology (GIST), Buk-gu, Gwangju 61005, Korea
    These authors contributed equally to this work and should be considered co-first authors.)

  • Sangki Choi

    (School of Earth Sciences and Environmental Engineering, Gwangju Institute of Science and Technology (GIST), Buk-gu, Gwangju 61005, Korea)

  • Jingyeong Shin

    (School of Earth Sciences and Environmental Engineering, Gwangju Institute of Science and Technology (GIST), Buk-gu, Gwangju 61005, Korea)

  • Chanhyuk Park

    (Department of Environmental Science and Engineering, Ewha Womans University, Seoul 03760, Korea)

  • Si-Kyung Cho

    (Department of Biological and Environmental Science, Dongguk University, Goyang, Gyeonggi-do 10326, Korea)

  • Young Mo Kim

    (School of Earth Sciences and Environmental Engineering, Gwangju Institute of Science and Technology (GIST), Buk-gu, Gwangju 61005, Korea)

Abstract

Spent coffee grounds (SCG) are one of the lignocellulosic biomasses that have gained much attention due to their high potential both in valorization and biomethane production. Previous studies have reported single processes that extract either fatty acids/lignin or biogas. In this study, an integrated physicochemical and biological process was investigated, which sequentially recovers lignin, fatty acid methyl esters (FAME) and biogas from the residue of SCG. The determination of optimal conditions for sequential separation was based on central composite design (CCD) and response surface methodology (RSM). Independent variables adopted in this study were reaction temperature (86.1–203.9 °C), concentration of sulfuric acid (0.0–6.4%v/v) and methanol to SCG ratio (1.3–4.7 mL/g). Under determined optimal conditions of 161.0 °C, 3.6% and 4.7 mL/g, lignin and FAME yields were estimated to be 55.5% and 62.4%, respectively. FAME extracted from SCG consisted of 41.7% C16 and 48.16% C18, which makes the extractives appropriate materials to convert into biodiesel. Results from Fourier transform infrared spectroscopy (FT-IR) further support that lignin and FAME extracted from SCG have structures similar to previously reported extractives from other lignocellulosic biomasses. The solid residue remaining after lignin and FAME extraction was anaerobically digested under mesophilic conditions, resulting in a methane yield of 36.0 mL-CH 4 /g-VS added . This study is the first to introduce an integrated resource recovery platform capable of valorization of a municipal solid waste stream.

Suggested Citation

  • 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.
    • Handle: RePEc:gam:jeners:v:12:y:2019:i:12:p:2360-:d:241307
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    References listed on IDEAS

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    1. Bolonio, David & García-Martínez, María-Jesús & Ortega, Marcelo F. & Lapuerta, Magín & Rodríguez-Fernández, José & Canoira, Laureano, 2019. "Fatty acid ethyl esters (FAEEs) obtained from grapeseed oil: A fully renewable biofuel," Renewable Energy, Elsevier, vol. 132(C), pages 278-283.
    2. 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.
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    2. Mohammed Kamil & Khalid Ramadan & Abdul Ghani Olabi & Chaouki Ghenai & Abrar Inayat & Mugdad H. Rajab, 2019. "Desert Palm Date Seeds as a Biodiesel Feedstock: Extraction, Characterization, and Engine Testing," Energies, MDPI, vol. 12(16), pages 1-20, August.
    3. Robert Czubaszek & Agnieszka Wysocka-Czubaszek & Aneta Sienkiewicz & Alicja Piotrowska-Niczyporuk & Martin J. Wassen & Andrzej Bajguz, 2024. "Possibilities of Utilising Biomass Collected from Road Verges to Produce Biogas and Biodiesel," Energies, MDPI, vol. 17(7), pages 1-21, April.
    4. Lorena Torres Albarracin & Irina Ramirez Mas & Lucas Tadeu Fuess & Renata Piacentini Rodriguez & Maria Paula Cardeal Volpi & Bruna de Souza Moraes, 2024. "The Bioenergetic Potential from Coffee Processing Residues: Towards an Industrial Symbiosis," Resources, MDPI, vol. 13(2), pages 1-21, January.
    5. Laura Sisti & Annamaria Celli & Grazia Totaro & Patrizia Cinelli & Francesca Signori & Andrea Lazzeri & Maria Bikaki & Philippe Corvini & Maura Ferri & Annalisa Tassoni & Luciano Navarini, 2021. "Monomers, Materials and Energy from Coffee By-Products: A Review," Sustainability, MDPI, vol. 13(12), pages 1-19, June.

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