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Improvement of Waste Dehydrated Sludge for Anaerobic Digestion through High-Temperature and High-Pressure Solubilization

Author

Listed:
  • Eui-Hwan Hong

    (Jeongbong Co., Ltd., Cheongju 28516, Korea)

  • Jun-Gyu Park

    (Department of Environmental Engineering, Chungbuk National University, Cheongju 361-763, Korea)

  • Beom Lee

    (Department of Environmental Engineering, Chungbuk National University, Cheongju 361-763, Korea)

  • Wei-Qi Shi

    (Department of Environmental Engineering, Chungbuk National University, Cheongju 361-763, Korea)

  • Hang-Bae Jun

    (Department of Environmental Engineering, Chungbuk National University, Cheongju 361-763, Korea)

Abstract

Biochemical methane potential tests and lab-scale continuous experiments were conducted to improve the yield and energy efficiency of anaerobic digestion through thermal hydrolysis pre-treatment. Methane generation, yield, and solubilization efficiency were evaluated through lab-scale tests. The pre-treated samples presented 50% biodegradability at 140 °C and 61.5% biodegradability at 165 °C. The increase in biodegradability was insignificant at 165 °C or higher temperature, and it was confirmed that the optimum conditions were achieved at 165 °C and 20 min of solubilization. The lab-scale continuous experiments confirmed that polymers were decomposed into low-molecular-weight compounds due to thermal hydrolysis, and pH decreased. NH 4 HCO 3 produced by thermal hydrolysis acted as an alkali to enable a more stable operation compared to that before thermal hydrolysis. Total chemical oxygen demand as chromium (TCOD Cr ) and soluble chemical oxygen demand as chromium (SCOD Cr ) indicated 35.4% and 23.1% removal efficiency in terms of organic matter removal, respectively. Methane yield was approximately 0.35 kg m −3 at 2.0–4.0 kg (m 3 d) −1 and 0.26 kg m −3 at 5.0 kg (m 3 d) −1 . The solubilization rate of 40.9% by thermal hydrolysis was confirmed through the lab-scale tests to determine its full-scale applicability.

Suggested Citation

  • Eui-Hwan Hong & Jun-Gyu Park & Beom Lee & Wei-Qi Shi & Hang-Bae Jun, 2019. "Improvement of Waste Dehydrated Sludge for Anaerobic Digestion through High-Temperature and High-Pressure Solubilization," Energies, MDPI, vol. 13(1), pages 1-16, December.
    • Handle: RePEc:gam:jeners:v:13:y:2019:i:1:p:88-:d:301209
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    References listed on IDEAS

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    1. Ariunbaatar, Javkhlan & Panico, Antonio & Esposito, Giovanni & Pirozzi, Francesco & Lens, Piet N.L., 2014. "Pretreatment methods to enhance anaerobic digestion of organic solid waste," Applied Energy, Elsevier, vol. 123(C), pages 143-156.
    2. Tyagi, Vinay Kumar & Lo, Shang-Lien, 2013. "Sludge: A waste or renewable source for energy and resources recovery?," Renewable and Sustainable Energy Reviews, Elsevier, vol. 25(C), pages 708-728.
    3. Jun-Gyu Park & Won-Beom Shin & Wei-Qi Shi & Hang-Bae Jun, 2019. "Changes of Bacterial Communities in an Anaerobic Digestion and a Bio-Electrochemical Anaerobic Digestion Reactors According to Organic Load," Energies, MDPI, vol. 12(15), pages 1-11, August.
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