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Stimulation of Lipid Extraction Efficiency from Sewage Sludge for Biodiesel Production through Hydrothermal Pretreatment

Author

Listed:
  • Jongkeun Lee

    (Department of Civil and Environmental Engineering, College of Engineering, Konkuk University, Seoul 05029, Korea
    These authors contributed equally to this work.)

  • Oh Kyung Choi

    (Department of Environmental Engineering, College of Science and Technology, Korea University, Sejong-si 30019, Korea
    These authors contributed equally to this work.)

  • Dooyoung Oh

    (Department of Civil and Environmental Engineering, College of Engineering, Konkuk University, Seoul 05029, Korea)

  • Kawnyong Lee

    (Department of Environment & Health, Jangan University, Gyeonggi-do 18331, Korea)

  • Ki Young Park

    (Department of Civil and Environmental Engineering, College of Engineering, Konkuk University, Seoul 05029, Korea)

  • Daegi Kim

    (Department of Environmental Engineering, College of Engineering, Daegu University, Gyeongsangbuk-do 38453, Korea)

Abstract

In this study, two types of sewage sludge (primary sludge and waste activated sludge) were hydrothermally treated at 125–250 °C to enhance the lipid extraction efficiency and obtain a higher biodiesel yield. The enhanced efficiency of the lipid extraction method was compared with the efficiency of the organic solvent extraction method. The results confirmed that a hydrothermal reaction could be an appropriate option for disrupting sludge cell walls and increasing the lipid extraction from sewage sludge. The highest lipid recovery efficiency was observed at 200 °C, and the lipid recovery efficiency of primary sludge and waste activated sludge increased from 7.56% and 5.35% to 14.01% and 11.55% by weight, respectively. Furthermore, transesterified lipids, such as biodiesel from sewage sludge, mostly consist of C16 and C18 methyl esters, and have features similar to those of jatropha oil-based biodiesel. During the hydrothermal treatment, the carbon content in the sludge decreased as the carbon transformed into lipids and the lipids were extracted. The volatile matter and fixed carbon content in the solid residue decreased and increased, respectively, through chemical dehydration and decarboxylation reactions under hydrothermal reaction conditions.

Suggested Citation

  • Jongkeun Lee & Oh Kyung Choi & Dooyoung Oh & Kawnyong Lee & Ki Young Park & Daegi Kim, 2020. "Stimulation of Lipid Extraction Efficiency from Sewage Sludge for Biodiesel Production through Hydrothermal Pretreatment," Energies, MDPI, vol. 13(23), pages 1-10, December.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:23:p:6392-:d:455750
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    References listed on IDEAS

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    1. Choi, Oh Kyung & Park, Jo Yong & Kim, Jae-Kon & Lee, Jae Woo, 2019. "Bench-scale production of sewage sludge derived-biodiesel (SSD-BD) and upgrade of its quality," Renewable Energy, Elsevier, vol. 141(C), pages 914-921.
    2. Oh Kyung Choi & Zachary Hendren & Ki Young Park & Jae-Kon Kim & Jo Yong Park & Ahjeong Son & Jae Woo Lee, 2019. "Characterization and Recovery of In Situ Transesterifiable Lipids (TLs) as Potential Biofuel Feedstock from Sewage Sludge Obtained from Various Sewage Treatment Plants (STPs)," Energies, MDPI, vol. 12(20), pages 1-12, October.
    3. Bach, Quang-Vu & Skreiberg, Øyvind, 2016. "Upgrading biomass fuels via wet torrefaction: A review and comparison with dry torrefaction," Renewable and Sustainable Energy Reviews, Elsevier, vol. 54(C), pages 665-677.
    4. Dinko Đurđević & Paolo Blecich & Željko Jurić, 2019. "Energy Recovery from Sewage Sludge: The Case Study of Croatia," Energies, MDPI, vol. 12(10), pages 1-19, May.
    5. Gil, A. & Siles, J.A. & Martín, M.A. & Chica, A.F. & Estévez-Pastor, F.S. & Toro-Baptista, E., 2018. "Effect of microwave pretreatment on semi-continuous anaerobic digestion of sewage sludge," Renewable Energy, Elsevier, vol. 115(C), pages 917-925.
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    Cited by:

    1. Jongkeun Lee & Sungwan Cho & Daegi Kim & JunHee Ryu & Kwanyong Lee & Haegeun Chung & Ki Young Park, 2021. "Conversion of Slaughterhouse Wastes to Solid Fuel Using Hydrothermal Carbonization," Energies, MDPI, vol. 14(6), pages 1-10, March.

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