Separated two-stage hydrothermal liquefaction of livestock manure for high-quality bio-oil with low-nitrogen content : Insights on nitrogen migration and evolution

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

1 Scopus Citations
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Author(s)

  • Siyuan Long
  • Haiwei Jiang
  • Jinming Shi
  • Xianbin Ai
  • Zhigang Que
  • Hanbing Nie
  • Rong Huang
  • Yinxuan Fu
  • Weiran Yang

Related Research Unit(s)

Detail(s)

Original languageEnglish
Article number146999
Journal / PublicationChemical Engineering Journal
Volume477
Online published4 Nov 2023
Publication statusPublished - 1 Dec 2023

Abstract

The practical utilization of hydrothermal liquefaction (HTL)-derived bio-oil encounters limitations due to its high nitrogen (N) content, specifically when derived from protein-rich feedstock such as algae and livestock manure. In this study, a separated two-stage HTL (ST-HTL) was developed for producing bio-oil with high yield and low N-content. The main objective of this study was to reveal the N migration and evolution during the HTL process for a better understanding of the detailed mechanism. The separated two-stage HTL yielded the highest bio-oil, 32.90 wt%, with a maximum energy recovery of 68.47 %. In conventional HTL-derived bio-oil (280 °C), 38.85 % of N and 56.22 % of C (carbon) was transferred to the bio-oil, while 26.04 % of N and 61.34 % of C (carbon) in swine manure was transferred into the ST-HTL-derived bio-oil, which indicated a 32.83 % reduction in N-transfers and 8.35 % increase in C-transfers. GC–MS analysis revealed that the bio-oil from ST-HTL contained a higher proportion of fatty acids and a lower proportion of nitrogenous compounds compared to conventional HTL (280 °C). In addition, FT-ICR MS revealed that the ST-HTL-derived-bio-oil was more saturated than conventional HTL-derived bio-oil (280 °C). The underlying mechanism behind the increased bio-oil yield and reduced N content attained through ST-HTL are discussed in detail, thereby revealing its intrinsic merits. Thus, it is the first study to propose the N migration and evolution pathways during ST-HTL through detailed characterizations, thus, demonstrating its potential for improving the feasibility of processing high-protein livestock manure and promising practical applications. © 2023 Elsevier B.V.

Research Area(s)

  • Bio-oil upgrading, Livestock manure, Nitrogen removal, Nitrogen transformation, Two-stage hydrothermal liquefaction

Citation Format(s)

Separated two-stage hydrothermal liquefaction of livestock manure for high-quality bio-oil with low-nitrogen content: Insights on nitrogen migration and evolution. / Long, Siyuan; Jiang, Haiwei; Shi, Jinming et al.
In: Chemical Engineering Journal, Vol. 477, 146999, 01.12.2023.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review