Journal
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
Volume 167, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jaap.2022.105678
Keywords
Sewage sludge; Hydrothermal carbonization; Aqueous phase; Hydrochar Industrial application
Funding
- Inner Mongolia Major Science and Technology Major Project [2021ZD0022]
- State Key Laboratory of High efficiency Utilization of Coal and Green Chemical Engineering (China)
- Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology [BM2012110]
- King Saud University, Riyadh, Saudi Arabia [RSP-2020/1]
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This article discusses the application of hydrothermal carbonization (HTC) technology in treating sludge and generating solid fuel products, with a focus on the process and treatment of the aqueous phase. By discussing the influence of aqueous phase properties on the properties of hydrochar and the mechanism during HTC, new research directions and application prospects in this field are provided for further development.
Hydrothermal carbonization (HTC) emerges as a promising technology to reduce the volume of activated sewage sludge (SS) and generate solid products as fuels. During HTC, extracellular polymeric substance and cell wall degrade to form low molecular compounds, which can further carry out hydrolysis, dehydration, polymerization, etc. The temperature has a notable impact on the HTC, which ultimately changes the composition of the aqueous phase. A large amount of the aqueous phase remains a by-product containing high amounts of organic and inorganic compounds. Herein, the HTC of SS process and aqueous phase treatment were discussed, especially in industrial applications within China. This review depicts the influence of aqueous phase properties on the hydrochar properties of SS, especially using the aqueous phase recirculation process. The mechanism during HTC of SS has been discussed, especially Maillard reaction, which would significantly influence the aqueous phase and hydrochar. The systematic information on the current research, new applications and new perspectives in this field to promote its further development were provided.
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