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

Eui-Hwan Hong, Jun-Gyu Park, Beom Lee, Wei-Qi Shi and Hang-Bae Jun
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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

Energies, 2019, vol. 13, issue 1, 1-16

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.

Keywords: anaerobic digestion; waste dehydrated sludge; high temperature; high pressure; solubilization (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
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