Journal
ENVIRONMENTAL POLLUTION
Volume 260, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2020.114067
Keywords
Hydrothermal carbonization; Sewage sludge; Sulfur balance; Evolution mechanism
Categories
Funding
- State Key Laboratory of pollution control and treatment of petroleum and petrochemical industry [PPC2017003]
- National Natural Science Foundation of China [51679083]
- project of the National a key research and development project of Hunan Province [2018WK2011]
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To understand the effect of reaction temperature on sulfur during hydrothermal carbonization (HTC) of sewage sludge (SS), seven group of temperature (180-300 degrees C) were chosen to investigate the distributions and evolution of sulfur-containing compounds in hydrochar and the liquid products. Elemental analysis, X-ray photoelectron spectroscopy (XPS), and X-Ray powder diffraction (XRD) were used to characterize the distribution of sulfur in hydrochar. The concentrations of sulfate ions and sulfide were determined in the liquid sample. The experimental results showed that as the temperature increased, the O/C ratio decreased because of the improved carbonization degree of SS. After hydrothermal carbonization, 90% of the sulfur in SS remained in hydrochar. As the temperature increased, the amount of sulfur in the liquid, mainly in the form of sulfate ions, tended to decrease. However, the experimental results for the gas phase were the opposite of the liquid phase. (C) 2020 Elsevier Ltd. All rights reserved.
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