Rapid conversion of fat, oil and grease (FOG) into biodiesel without pre-treatment of FOG

Jechan Lee, Jong Min Jung, Chanhyuk Park, Byong Hun Jeon, Chi Hwa Wang, Sang Ryong Lee, Eilhann E. Kwon

Research output: Contribution to journalArticlepeer-review

22 Scopus citations


In this study, the conversion of fat, oil and grease (FOG) into fatty acid methyl esters (FAMEs) without pre-treatment of FOG is investigated. A thermally induced process to accomplish simultaneous esterification of free fatty acids (FFAs) and transesterification of lipids is introduced. Despite high contents of impurities in FOG (∼14 wt%), the maximum achievable yield of FAMEs on feedstock mass basis was >86% for 10 s reaction time without removal of impurities prior to the reaction while conventional acid catalyzed reaction only produced <27.7% FAMEs from FOG. This means that the introduced technique can be effective for the conversion of low-quality raw material (e.g., FOG) into biodiesel. This study would suggest the potential not only for developing a sustainable integrated treatment process of FOG requiring no separation of lipids and FFAs in wastewater treatment facilities but also for using FOG as a renewable energy resource.

Original languageEnglish
Pages (from-to)1211-1216
Number of pages6
JournalJournal of Cleaner Production
StatePublished - 1 Dec 2017

Bibliographical note

Funding Information:
This work was supported by the New & Renewable Energy Core Technology Program of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) granted financial resource from the Ministry of Trade, Industry & Energy, Republic of Korea (No. 20163010092290 ). Appendix A

Publisher Copyright:
© 2017 Elsevier Ltd


  • Biodiesel
  • Fat, oil and grease (FOG)
  • Simultaneous esterification/transesterification
  • Waste management
  • Waste-to-energy


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