Tailoring pyrogenic products from pyrolysis of defatted Euglena gracilis using CO 2 as reactive gas medium

Jong Min Jung, Sok Kim, Jechan Lee, Jeong Ik Oh, Yoon-E Choi, Eilhann E. Kwon

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Pyrolysis of defatted Euglena gracilis was investigated in this study to maximize energy recovery from algal biomass after lipid extraction. Prior to pyrolysis of defatted E. gracilis, the growth rate of E. gracilis was monitored to determine its potential as an initial carbonaceous feedstock for pyrolysis. This study revealed that the cell density of E. gracilis linearly increased for the first 5 days, during which the cell density reached 6.06 ± 0.82 g L −1 , demonstrating that defatted E. gracilis is a promising feedstock for pyrolysis. To increase the thermal efficiency of defatted E. gracilis pyrolysis, CO 2 was employed as a reactive gas medium. CO levels were increased by 45% following pyrolysis of defatted E. gracilis in a CO 2 environment compared to in an N 2 environment. Considering that CO is a highly combustible permanent gas, the use of CO 2 in pyrolysis may result in the production of more fuel-range gaseous chemicals. Additionally, CO 2 utilization increased the gaseous product yield compared to N 2 -pyrolysis for treating the defatted algal biomass while decreasing tar yield.

Original languageEnglish
Pages (from-to)184-190
Number of pages7
JournalEnergy
DOIs
Publication statusPublished - 2019 May 1

Keywords

  • Carbon dioxide
  • Euglena gracilis
  • Microalgae
  • Pyrolysis
  • Syngas
  • Thermo-chemical process

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Pollution
  • Mechanical Engineering
  • Industrial and Manufacturing Engineering
  • Electrical and Electronic Engineering

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