Recent Advances in Hydrothermal Carbonization of Sewage Sludge

Salah Jellali*, Antonis A. Zorpas, Sulaiman Alhashmi, Mejdi Jeguirim

*Corresponding author for this work

Research output: Contribution to journalEditorialpeer-review

5 Citations (Scopus)


The transition from the use of fossil fuels to renewable and green energy is a worldwide challenge that must be seriously considered in order to ensure sustainable development and the preservation of the environment. The conversion of wet biomasses (i.e., sewage sludge) into energy through thermochemical processes in general and hydrothermal carbonization (HTC) in particular has been pointed out as an interesting and attractive approach for the energetic and agricultural valorization of the produced solid residues, named hydrochars. The success of such valorization options is highly dependent on these hydrochars’ physico-chemical and energetic properties that are influenced not only by the type of the sludge (urban or industrial) and its nature (primary, secondary, or digested) but also by the HTC parameters, especially temperature, pressure, and residence time. This editorial provides a summary of the latest studies regarding the impact of the cited above parameters on the properties of the produced hydrochars. The economic and environmental feasibility of this process for sewage sludge management is also presented.

Original languageEnglish
Article number6714
Issue number18
Publication statusPublished - Sept 14 2022


  • agricultural use
  • characterization
  • energetic valorization
  • hydrochars
  • hydrothermal carbonization
  • sewage sludge

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Building and Construction
  • Fuel Technology
  • Engineering (miscellaneous)
  • Energy Engineering and Power Technology
  • Energy (miscellaneous)
  • Control and Optimization
  • Electrical and Electronic Engineering

Cite this