Improved methane production and energy recovery of post-hydrothermal liquefaction waste water via integration of zeolite adsorption and anaerobic digestion

Ruirui Li, Dianlei Liu, Yifeng Zhang, Na Duan, Jialiang Zhou, Zhidan Liu, Yuanhui Zhang

Research output: Contribution to journalArticle

Abstract

Hydrothermal liquefaction (HTL) is a promising technology for converting organic wastes into bio-crude oil, with organic-rich post-hydrothermal liquefaction wastewater (PHWW) as by-product. In this study, zeolite adsorption and anaerobic digestion (AD) were integrated to improve the methane production and energy recovery of PHWW from Chlorella 1067. A statistical design for maximum toxicants removal by zeolite was applied before AD process. Zeolite could mitigate the inhibition associated to compounds such as ammonia, N-heterocyclic compounds, etc. in PHWW and thereby shortening the lag phase and increasing methane production by 32–117% compared with that without zeolite adsorption. Zeolite adsorption also increased energy recovery efficiency (up to 70.5%) for this integrated system. Integration of HTL and AD brought higher energetic return from feedstock via oil and biomethane production, which may offer insight into industrial application of microalgae biomass in the circular economy. In addition, carbon and nitrogen flow for the integrated process was determined.

LanguageEnglish (US)
Pages61-69
Number of pages9
JournalScience of the Total Environment
Volume651
DOIs
StatePublished - Feb 15 2019

Fingerprint

Zeolites
Anaerobic digestion
Methane
Liquefaction
liquefaction
zeolite
Wastewater
methane
adsorption
Adsorption
Recovery
wastewater
Heterocyclic Compounds
Petroleum
Ammonia
Feedstocks
Industrial applications
crude oil
Byproducts
Oils

Keywords

  • Anaerobic digestion
  • Energy recovery
  • Microalgae
  • Post-hydrothermal liquefaction wastewater
  • Zeolite

ASJC Scopus subject areas

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

Cite this

Improved methane production and energy recovery of post-hydrothermal liquefaction waste water via integration of zeolite adsorption and anaerobic digestion. / Li, Ruirui; Liu, Dianlei; Zhang, Yifeng; Duan, Na; Zhou, Jialiang; Liu, Zhidan; Zhang, Yuanhui.

In: Science of the Total Environment, Vol. 651, 15.02.2019, p. 61-69.

Research output: Contribution to journalArticle

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