Thermophilic biodesulfurization of hydrodesulfurized light gas oils by Mycobacterium phlei WU-F1

Toshiki Furuya, Yoshitaka Ishii, Ken ichi Noda, Kuniki Kino, Kohtaro Kirimura

Research output: Contribution to journalArticle

48 Citations (Scopus)

Abstract

Recalcitrant organosulfur compounds such as dibenzothiophene (DBT) derivatives in light gas oil (LGO) cannot be removed by conventional hydrodesulfurization (HDS) treatment using metallic catalysts. The thermophilic DBT-desulfurizing bacterium Mycobacterium phlei WU-F1 grew in a medium with hydrodesulfurized LGO as the sole source of sulfur, and exhibited high desulfurizing ability toward LGO between 30 and 50°C. When WU-F1 was cultivated at 45°C with B-LGO (390 ppm S), F-LGO (120 ppm S) or X-LGO (34 ppm S) as the sole source of sulfur, biodesulfurization resulted in around 60-70% reduction of sulfur content for all three types of hydrodesulfurized LGOs. In addition, when resting cells were incubated at 45°C with hydrodesulfurized LGOs in the reaction mixtures containing 50% (v/v) oils, biodesulfurization reduced the sulfur content from 390 to 100 ppm S (B-LGO), from 120 to 42 ppm S (F-LGO) and from 34 to 15 ppm S (X-LGO). Gas chromatography analysis with an atomic emission detector revealed that the peaks of alkylated DBTs including 4-methyl-DBT, 4,6-dimethyl-DBT and 3,4,6-trimethyl-DBT significantly decreased after biodesulfurization. Therefore, thermophilic M. phlei WU-F1, which could effectively desulfurize HDS-treated LGOs over a wide temperature range up to 50°C, may be a promising biocatalyst for practical biodesulfurization of diesel oil.

Original languageEnglish
Pages (from-to)137-142
Number of pages6
JournalFEMS Microbiology Letters
Volume221
Issue number1
DOIs
Publication statusPublished - 2003 Apr 11

Keywords

  • Desulfurization
  • Dibenzothiophene
  • Diesel oil
  • Light gas oil
  • Mycobacterium phlei

ASJC Scopus subject areas

  • Microbiology
  • Molecular Biology
  • Genetics

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