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Coupling hydrothermal carbonization of digestate and supercritical water gasification of liquid products

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  • Taufer, Noah Luciano
  • Benedetti, Vittoria
  • Pecchi, Matteo
  • Matsumura, Yukihiko
  • Baratieri, Marco

Abstract

This work investigates the coupling of hydrothermal carbonization (HTC) and supercritical water gasification (SCWG) as a combined process to fully valorise digestate from anaerobic digestion. Firstly, HTC was performed at three different temperatures (180, 220 and 250 °C) to convert digestate to hydrochar (HC) and aqueous HTC liquids (AHLs) and then, SCWG was performed on AHLs to produce a H2-rich gas. Different SCWG temperatures (500, 550 and 600 °C), residence times (15, 30, 60 and 90 s) and AHLs concentrations (6.7, 13.6 and 20.0%) were tested. Increasing SCWG temperature resulted in an increase of the carbon yield and H2 content in the gas phase, for increasing residence time the carbon yield in the gas phase decreased, while increasing the feedstock concentration led to a higher gas generation rate without affecting the carbon yield of the gas. The maximum carbon yield in the gas phase (51%) was reached for tests run at 600 °C, 15 s, and 6.7% of AHLs, the maximum hydrogen content in the gas phase (79%) was reached at 600 °C, 30 s, 6.7% of AHLs, the maximum gas generation rate (9.33 mL min−1) was reached at 600 °C, 30 s, 20.0% of AHLs.

Suggested Citation

  • Taufer, Noah Luciano & Benedetti, Vittoria & Pecchi, Matteo & Matsumura, Yukihiko & Baratieri, Marco, 2021. "Coupling hydrothermal carbonization of digestate and supercritical water gasification of liquid products," Renewable Energy, Elsevier, vol. 173(C), pages 934-941.
    • Handle: RePEc:eee:renene:v:173:y:2021:i:c:p:934-941
    DOI: 10.1016/j.renene.2021.04.058
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    References listed on IDEAS

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    1. Zhang, Zhikun & Zhu, Zongyuan & Shen, Boxiong & Liu, Lina, 2019. "Insights into biochar and hydrochar production and applications: A review," Energy, Elsevier, vol. 171(C), pages 581-598.
    2. Wang, Tengfei & Zhai, Yunbo & Zhu, Yun & Li, Caiting & Zeng, Guangming, 2018. "A review of the hydrothermal carbonization of biomass waste for hydrochar formation: Process conditions, fundamentals, and physicochemical properties," Renewable and Sustainable Energy Reviews, Elsevier, vol. 90(C), pages 223-247.
    3. Pecchi, Matteo & Patuzzi, Francesco & Benedetti, Vittoria & Di Maggio, Rosa & Baratieri, Marco, 2020. "Kinetic analysis of hydrothermal carbonization using high-pressure differential scanning calorimetry applied to biomass," Applied Energy, Elsevier, vol. 265(C).
    4. Pecchi, Matteo & Baratieri, Marco, 2019. "Coupling anaerobic digestion with gasification, pyrolysis or hydrothermal carbonization: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 105(C), pages 462-475.
    5. Masebinu, S.O. & Akinlabi, E.T. & Muzenda, E. & Aboyade, A.O., 2019. "A review of biochar properties and their roles in mitigating challenges with anaerobic digestion," Renewable and Sustainable Energy Reviews, Elsevier, vol. 103(C), pages 291-307.
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    2. Feng, Hongyu & Cui, Jintao & Xu, Zhang & Hantoko, Dwi & Zhong, Li & Xu, Donghai & Yan, Mi, 2023. "Sewage sludge treatment via hydrothermal carbonization combined with supercritical water gasification: Fuel production and pollution degradation," Renewable Energy, Elsevier, vol. 210(C), pages 822-831.
    3. Aragon-Briceño, Christian & Pożarlik, Artur & Bramer, Eddy & Brem, Gerrit & Wang, Shule & Wen, Yuming & Yang, Weihong & Pawlak-Kruczek, Halina & Niedźwiecki, Łukasz & Urbanowska, Agnieszka & Mościcki,, 2022. "Integration of hydrothermal carbonization treatment for water and energy recovery from organic fraction of municipal solid waste digestate," Renewable Energy, Elsevier, vol. 184(C), pages 577-591.

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