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Characterization and Recovery of In Situ Transesterifiable Lipids (TLs) as Potential Biofuel Feedstock from Sewage Sludge Obtained from Various Sewage Treatment Plants (STPs)

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  • Oh Kyung Choi

    (Department of Environmental Engineering, Korea University, Sejong 30019, Korea
    Center of Technology for Energy, Environment & Engineering, RTI International, Research Triangle Park, Durham, NC 27709, USA)

  • Zachary Hendren

    (Center of Technology for Energy, Environment & Engineering, RTI International, Research Triangle Park, Durham, NC 27709, USA)

  • Ki Young Park

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

  • Jae-Kon Kim

    (Research Institute of Petroleum Technology, Korea Petroleum Quality & Distribution Authority, Chungbuk 28115, Korea)

  • Jo Yong Park

    (Research Institute of Petroleum Technology, Korea Petroleum Quality & Distribution Authority, Chungbuk 28115, Korea)

  • Ahjeong Son

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

  • Jae Woo Lee

    (Department of Environmental Engineering, Korea University, Sejong 30019, Korea)

Abstract

This study purposed to characterize the sewage sludge from various sewage treatment plants (STPs) as a biodiesel feedstock. Crude biodiesel was produced from each dried primary sludge (PS) and waste activated sludge (WAS) via in situ transesterification process. The average yield of transesterifiable lipid (TL) was 77.8% and 60.4% of the total lipid content from PS and WAS, respectively. The TL yield had a greater margin among WAS than PS samples due to differences in the biological processes adopted in each treatment plant. The TL recovered from PS and WAS contained 54.2% and 40.1% fatty acid methyl esters (FAMEs), respectively, which were mostly made up of palmitic acid (C16:0) and stearic acid (C18:0). The FAME composition of the biodiesel in the WAS sample was highly associated with a microbial community that grows otherwise, depending on the purpose of the biological treatment process. In particular, the increase in the proportion of nitrifying bacteria that grow predominantly under a relatively longer solid retention time (SRT) contributed significantly to the improvement in FAME content.

Suggested Citation

  • 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.
  • Handle: RePEc:gam:jeners:v:12:y:2019:i:20:p:3952-:d:277624
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    References listed on IDEAS

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    1. Chen, Jiaxin & Li, Ji & Dong, Wenyi & Zhang, Xiaolei & Tyagi, Rajeshwar D. & Drogui, Patrick & Surampalli, Rao Y., 2018. "The potential of microalgae in biodiesel production," Renewable and Sustainable Energy Reviews, Elsevier, vol. 90(C), pages 336-346.
    2. Singh, S.P. & Singh, Dipti, 2010. "Biodiesel production through the use of different sources and characterization of oils and their esters as the substitute of diesel: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 14(1), pages 200-216, January.
    3. Choi, Oh Kyung & Lee, Kwanhyoung & Park, Ki Young & Kim, Jae-Kon & Lee, Jae Woo, 2017. "Pre-recovery of fatty acid methyl ester (FAME) and anaerobic digestion as a biorefinery route to valorizing waste activated sludge," Renewable Energy, Elsevier, vol. 108(C), pages 548-554.
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    1. 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.

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