Enhanced anaerobic digestion of post-hydrothermal liquefaction wastewater: Bio-methane production, carbon distribution and microbial metabolism

Ruirui Li, Dianlei Liu, Yuanhui Zhang, Giovana Tommaso, Buchun Si, Zhidan Liu, Na Duan

Research output: Contribution to journalArticlepeer-review

Abstract

Hydrothermal liquefaction (HTL) is a cost-effective and environment-friendly technology for using biomass to produce bio-crude oil. The critical challenge of HTL is its complicated aqueous product containing high concentrations of organics and diverse toxicants. This paper reports the continuous anaerobic digestion of raw and zeolite-adsorbed Chlorella HTL wastewater using up-flow anaerobic sludge bed reactors. The bio-methane production capacity, total carbon distribution and microbial response were investigated. The anaerobic process was severely suppressed when more than 20% raw wastewater was fed; while it showed essentially improved performance till 60% pre-treated wastewater was added. Produced methane contained 17.3% of the total carbon in feedstock, which was comparable with the value (16.7%) when 25% of raw wastewater was added. The metagenomic analysis revealed distinct microbial community structures in different stages and feedstock shifts. The abundance of functional genes was consistent with anaerobic digester performance.

Original languageEnglish (US)
Article number155659
JournalScience of the Total Environment
Volume837
DOIs
StatePublished - Sep 1 2022

Keywords

  • Anaerobic digestion
  • Chlorella
  • Metagenomic
  • Post-hydrothermal wastewater (PHWW)
  • Total carbon
  • Up-flow anaerobic sludge bed reactor (UASB)

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Waste Management and Disposal
  • Pollution

Fingerprint

Dive into the research topics of 'Enhanced anaerobic digestion of post-hydrothermal liquefaction wastewater: Bio-methane production, carbon distribution and microbial metabolism'. Together they form a unique fingerprint.

Cite this