Towards the implementation of hydrothermal carbonization for nutrients, carbon, and energy recovery in centralized biogas plant treating sewage sludge

Anna Hämäläinen, Marika Kokko, Henrik Tolvanen, Viljami Kinnunen, Jukka Rintala

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Abstract

In recent years, extensive experimental research on hydrothermal carbonization (HTC) of sewage sludge has been performed, to study the effects of process conditions on hydrochar characteristics and nutrient, carbon, and energy recovery from sewage sludge. To promote the implementation of HTC, this study assessed HTC (230 °C, 30 min) integration into an advanced centralized biogas plant by analyzing its theoretical effects on the fates of sewage sludge solids, nitrogen, phosphorus, and carbon. The study used the mass and nutrient flows and concentrations obtained from laboratory studies, and the studied biogas plant had an original layout that employed hygienization. HTC integration decreased the solid product volume by up to 56 % and, increased the recovery of ammonium in ammonia water by 33 % and methane by 1.4 %, while increasing the biogas plant energy demand by 4 %. The changes in the nutrient and solids flows and their recovery potentials show the need to consider the rearrangements of the liquid and gas flows in the biogas plant and the re-dimensioning of stripping process.

Original languageEnglish
Pages (from-to)99-108
Number of pages10
JournalWaste Management
Volume173
Early online date18 Nov 2023
DOIs
Publication statusPublished - 1 Jan 2024
Publication typeA1 Journal article-refereed

Keywords

  • Carbon sequestration
  • Energy recovery
  • Hydrothermal carbonization
  • Liquefied biogas
  • Nitrogen recovery
  • Sewage sludge digestate

Publication forum classification

  • Publication forum level 3

ASJC Scopus subject areas

  • Waste Management and Disposal

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