Valorization of the liquid fraction of co-hydrothermal carbonization of mixed biomass by anaerobic digestion: Effect of the substrate to inoculum ratio and hydrochar addition

Jhosané Pagés-Díaz*, César Huiliñir

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

22 Scopus citations

Abstract

The effect of the substrate to inoculum ratio (SIR) on the anaerobic digestion (AD) of the liquid fractions (LFs) of co-hydrothermally treated mixed biomass (sewage sludge (SS) and the organic fraction of municipal solid waste (MSW)) was evaluated. The impact of SS + MSW-hydrochar was also studied at different hydrochar concentrations (0, 1, 5, 10, 15, 20 and 25 ghydrochar/L), in two of the LFs studied. The SIR had a significant impact on methane yield (YCH4) and organic matter degradation, with low methane production (4–44 NmLCH4/g tCODadded) observed for all LFs at SIR = 1:3. Hydrochar significantly improved YCH4 and specific methane production rate. Compared with the AD without hydrochar, the YCH4 improved up to 1.95 times at 15 g/L. Hydrochar doses from 1 to 10 g/L shortened the lag phase, while higher concentrations (15 to 25 g/L) showed an increment with respect to the control reactor without hydrochar.

Original languageEnglish
Article number123989
JournalBioresource Technology
Volume317
DOIs
StatePublished - Dec 2020
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2020 Elsevier Ltd

Keywords

  • Anaerobic digestion
  • Hydrochar
  • Liquid fraction of co-hydrothermal carbonization
  • Municipal solid waste
  • Sewage sludge

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