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Applied and Environmental Microbiology, January 2006, p. 54-58, Vol. 72, No. 1
0099-2240/06/$08.00+0     doi:10.1128/AEM.72.1.54-58.2006
Copyright © 2006, American Society for Microbiology. All Rights Reserved.

Deep Desulfurization of Diesel Oil and Crude Oils by a Newly Isolated Rhodococcus erythropolis Strain

Bo Yu,1 Ping Xu,1* Quan Shi,2 and Cuiqing Ma1

State Key Laboratory of Microbial Technology, Shandong University, Jinan 250100,1 State Key Laboratory of Heavy Oil Processing, University of Petroleum, Beijing 102200, People's Republic of China2

Received 12 April 2005/ Accepted 23 September 2005

The soil-isolated strain XP was identified as Rhodococcus erythropolis. R. erythropolis XP could efficiently desulfurize benzonaphthothiophene, a complicated model sulfur compound that exists in crude oil. The desulfurization product of benzonaphthothiophene was identified as {alpha}-hydroxy-ß-phenyl-naphthalene. Resting cells could desulfurize diesel oil (total organic sulfur, 259 ppm) after hydrodesulfurization. The sulfur content of diesel oil was reduced by 94.5% by using the resting cell biocatalyst for 24 h at 30°C. Biodesulfurization of crude oils was also investigated. After 72 h of treatment at 30°C, 62.3% of the total sulfur content in Fushun crude oil (initial total sulfur content, 3,210 ppm) and 47.2% of that in Sudanese crude oil (initial total sulfur, 1,237 ppm) were removed. Gas chromatography with pulsed-flame photometric detector analysis was used to evaluate the effect of R. erythropolis XP treatment on the sulfur content in Fushun crude oil, and it was shown that most organic sulfur compounds were eliminated after biodesulfurization.

* Corresponding author. Mailing address: State Key Laboratory of Microbial Technology, Shandong University, Jinan 250100, People's Republic of China. Phone: 86-531-88564003. Fax: 86-531-88567250. E-mail: pingxu{at}sdu.edu.cn

Applied and Environmental Microbiology, January 2006, p. 54-58, Vol. 72, No. 1
0099-2240/06/$08.00+0     doi:10.1128/AEM.72.1.54-58.2006
Copyright © 2006, American Society for Microbiology. All Rights Reserved.



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