TY - JOUR
T1 - Hydrothermal carbonization of anaerobically digested sewage sludge for hydrochar production
AU - Huezo, Luis
AU - Vasco-Correa, Juliana
AU - Shah, Ajay
N1 - Funding Information:
This work was partially supported by state and federal funds appropriated to The Ohio State University , Ohio Agricultural Research and Development Center (SEEDS Award), the USDA National Institute of Food and Agriculture Federal Appropriations under Project PEN04671 and Accession number 1017582, and by the Schlumberger Foundation .
Publisher Copyright:
© 2021 Elsevier Ltd
PY - 2021/9
Y1 - 2021/9
N2 - Hydrothermal carbonization (HTC) can process anaerobic digestion effluent (ADE) from sewage sludge into hydrochar and liquor. The objective of this study was to assess the effects of HTC temperature, time, and initial ADE pH on the yields and properties of hydrochar and liquor. HTC was conducted at different ADE pH (original ~8.2 and modified ~6.8), temperatures (180 to 260 °C) and times (30 to 70 min) following a central composite design. Hydrochar yields from ADE at original and modified pH ranged from 70 to 80% and 62% to73%, respectively. Higher temperatures resulted in lower hydrochar and liquor yields. The obtained hydrochar had a low carbon content, high ash content, high H/C ratio, and low higher heating value, suggesting that it has little potential as solid fuel, and more potential as soil amendment. The liquor's composition and chemical oxygen demand indicate a potential for recirculation into anaerobic digestion.
AB - Hydrothermal carbonization (HTC) can process anaerobic digestion effluent (ADE) from sewage sludge into hydrochar and liquor. The objective of this study was to assess the effects of HTC temperature, time, and initial ADE pH on the yields and properties of hydrochar and liquor. HTC was conducted at different ADE pH (original ~8.2 and modified ~6.8), temperatures (180 to 260 °C) and times (30 to 70 min) following a central composite design. Hydrochar yields from ADE at original and modified pH ranged from 70 to 80% and 62% to73%, respectively. Higher temperatures resulted in lower hydrochar and liquor yields. The obtained hydrochar had a low carbon content, high ash content, high H/C ratio, and low higher heating value, suggesting that it has little potential as solid fuel, and more potential as soil amendment. The liquor's composition and chemical oxygen demand indicate a potential for recirculation into anaerobic digestion.
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U2 - 10.1016/j.biteb.2021.100795
DO - 10.1016/j.biteb.2021.100795
M3 - Article
AN - SCOPUS:85112236242
VL - 15
JO - Bioresource Technology Reports
JF - Bioresource Technology Reports
SN - 2589-014X
M1 - 100795
ER -
