Characterization of the solid products from hydrothermal liquefaction of waste feedstocks from food and agricultural industries

  • Borja Cantero-Tubilla
  • , Danilo A. Cantero
  • , Celia M. Martinez
  • , Jefferson W. Tester
  • , Larry P. Walker
  • , Roy Posmanik

Research output: Contribution to journalArticlepeer-review

80 Scopus citations

Abstract

This study characterized the hydro-char by-product from hydrothermal liquefaction (HTL) of waste feedstocks at two operating temperatures (250 and 300 C) and times (5 and 60 min). The feedstocks were a selection of wastes from: dairy industries (manure and yogurt whey), municipal wastewater treatment plant, dining halls, fruit and alcohol manufacturing and olive oil production. The hydro-char was characterized for mass yield, elemental composition, and Fourier Transform Infrared Spectroscopy (FTIR) coupled with principal component analysis (PCA). The goal was to understand the chemistry and functionalities of the hydro-char, to find alternative niches of applications, and to understand chemical mechanisms undergoing HTL. Results showed that hydro-char can be divided into two different groups regarding mass yield and energy content, based on the pH of the selected feedstocks. In addition, the FTIR-PCA approach was successful to determine specific chemical differences of hydro-char from acid and alkaline feedstocks at different reaction condition.

Original languageEnglish
Pages (from-to)665-673
Number of pages9
JournalJournal of Supercritical Fluids
Volume133
DOIs
StatePublished - 1 Mar 2018
Externally publishedYes

Keywords

  • FTIR-ATR
  • Higher heating value
  • Hydrothermal liquefaction
  • Principal component analysis
  • Valorization
  • Wet organic residues

ASJC Scopus subject areas

  • General Chemical Engineering
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

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