Special Issue "Recent Advances in Hydrothermal Carbonization"

A special issue of Processes (ISSN 2227-9717). This special issue belongs to the section "Environmental and Green Processes".

Deadline for manuscript submissions: 30 June 2022 | Viewed by 1492

Special Issue Editor

Dr. Benjamin Herklotz
E-Mail Website
Guest Editor
Department Biorefineries, DBFZ Deutsches Biomasseforschungszentrum gGmbH, Torgauer Straße 116, 04347 Leipzig, Germany
Interests: thermochemical conversion of biomass; hydrothermal processes; process water treatment

Special Issue Information

Dear Colleagues,

Hydrothermal carbonization (HTC) is a promising technology to convert biogenic residues (agricultural residues, industrial and municipal waste) into innovative material, energy, or environmental products. Its chemistry offers a huge potential to tune and control the product’s properties and demand, and produce designer carbon materials for a variety of applications from environmental sorbents and innovative energy storage to soil amendments. The liquid phase obtained during hydrothermal treatment contains a valuable source of chemicals and can be used as a feedstock for anaerobic digestion or upgraded to fuel precursors.

This Special Issue will focus on recent developments, driven by both fundamental research and applied technology. Researchers from diverse disciplines, ranging from chemists, material and chemical engineers to agricultural and soil scientists, are invited to submit manuscripts. Companies in solid waste and wastewater treatment, as well as those in the agricultural and energy industries, with feasibility studies or full-scale technological applications, are also invited to present their experiences.

Topics covered in this Special Issue dedicated to HTC include, but are not limited to:

  • Material and energetic use of HTC-products, ranging from adsorption, remediation, and nutrient recovery to solid and liquid fuel precursors as well as use in biogas production;
  • Fundamental insights into the HTC-process itself, ranging from kinetic and thermodynamic modeling to advanced product characterization;
  • Innovative applications of HTC-technology in diverse process chains in agricultural, environmental, industrial, or energy sectors, ranging from modern biorefineries to the disinfection or recycling of biogenic residues;
  • State-of-the-art in upscaling and commercialization, including the economic and legal framework of HTC-technology and its products worldwide;

Dr. Benjamin Herklotz 
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Processes is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2000 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.


  • hydrothermal carbonization
  • heat management
  • biorefinery concepts
  • biomass
  • biogenic residues
  • novel feedstock
  • hydrochar applications
  • up-scaling
  • legal constraints
  • process water handling

Published Papers (1 paper)

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Model-Based Evaluation of Hydrothermal Treatment for the Energy Efficient Dewatering and Drying of Sewage Sludge
Processes 2021, 9(8), 1346; https://doi.org/10.3390/pr9081346 - 30 Jul 2021
Cited by 3 | Viewed by 767
This research paper evaluates hydrothermal carbonization (HTC) as a possible treatment for sewage sludge, including phosphorus recycling. German governmental requirements force a high number of wastewater treatment plants (WWTP) to recover phosphorus from sewage sludge above limits of 20 g kgTS−1 [...] Read more.
This research paper evaluates hydrothermal carbonization (HTC) as a possible treatment for sewage sludge, including phosphorus recycling. German governmental requirements force a high number of wastewater treatment plants (WWTP) to recover phosphorus from sewage sludge above limits of 20 g kgTS−1 before further disposal (e.g., co-incineration). The results show that pH reduction has a positive effect on shifting phosphorus to the liquid phase during HTC. Although the experimental results of this research do not yet achieve the necessary phosphorus reduction, various calculations are made to achieve this goal in future experimental studies. In order to be able to assess the energy benefits of HTC, Aspen Plus modeling was used to show the positive impact of implementing this technology in a WWTP. It is shown that the mechanical dewaterability of sewage sludge (SS) increases after HTC enabling energy savings by means of subsequent thermal drying. A heat optimized HTC is able to cut energy expenses by half, further providing a phosphorus-depleted hydrochar for extensive energetic use. Full article
(This article belongs to the Special Issue Recent Advances in Hydrothermal Carbonization)
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