Abstract

Mixed sludge from a pulp and paper mill was hydrothermally carbonized at 180-260 degrees C for 0.5-5 h with the use of HCl or NaOH for determining the effect of acid and base additions during sludge carbonization. Based on the results carbonization was mainly governed by dehydration, depolymerization and decarboxylation of sludge components. Additive type had a statistically significant effect on hydrochar carbon content and carbon and energy yield, of which especially energy yield increased through the use of HCl. The theoretical energy efficiencies of carbonization increased with decreasing reaction temperature, retention time and the use of HCl and suggested that the energy requirement could be covered by the energy content of attained hydrochar. The BOD5/COD-ratios of analyzed liquid samples indicated that the dissolved organic components could be treated by conventional biological methods. (C) 2015 Elsevier Ltd. All rights reserved.

Keywords

Biosolids; Hydrothermal treatment; Sludge treatment; Wet torrefaction; Waste biomass

Published in

Bioresource Technology
2016, Volume: 200, pages: 444-450

SLU Authors

• Mäkelä, Mikko

  • Department of Forest Biomaterials and Technology, Swedish University of Agricultural Sciences
    

Sustainable Development Goals

Ensure access to affordable, reliable, sustainable and modern energy for all


UKÄ Subject classification

Paper, Pulp and Fiber Technology
Chemical Process Engineering


Publication identifier

DOI: https://doi.org/10.1016/j.biortech.2015.10.062

Permanent link to this page (URI)

https://res.slu.se/id/publ/68776