scholarly journals DBT desulfurization by decorating Rhodococcus erythropolis IGTS8 using magnetic Fe3 O4 nanoparticles in a bioreactor

2016 ◽  
Vol 17 (5) ◽  
pp. 528-535 ◽  
Author(s):  
Elham Karimi ◽  
Clayton Jeffryes ◽  
Fatemeh Yazdian ◽  
Abbas Akhavan Sepahi ◽  
Ash Hatamian ◽  
...  
Keyword(s):  
Rhodococcus Erythropolis ◽  
Rhodococcus Erythropolis Igts8

Production of a Rhodococcus erythropolis IGTS8 biocatalyst for DBT biodesulfurization: influence of operational conditions

2005 ◽  
Vol 22 (3) ◽  
pp. 229-237 ◽  
Author(s):  
Carolina H. del Olmo ◽  
Victoria E. Santos ◽  
Almudena Alcon ◽  
Felix Garcia-Ochoa
Keyword(s):  
Rhodococcus Erythropolis ◽  
Operational Conditions ◽  
Rhodococcus Erythropolis Igts8

scholarly journals Biodesulfurization of Dibenzothiophene and Its Alkylated Derivatives in a Two-Phase Bubble Column Bioreactor by Resting Cells of Rhodococcus erythropolis IGTS8

Processes ◽  
2021 ◽  
Vol 9 (11) ◽  
pp. 2064
Author(s):  
George Prasoulas ◽  
Konstantinos Dimos ◽  
Panayiotis Glekas ◽  
Styliani Kalantzi ◽  
Stamatis Sarris ◽  
...  
Keyword(s):  
Bubble Column ◽  
Rhodococcus Erythropolis ◽  
Exponential Growth Phase ◽  
Organosulfur Compounds ◽  
Intermediate Cell ◽  
Resting Cells ◽  
Two Phase ◽  
Bubble Column Bioreactor ◽  
Column Bioreactor ◽  
Rhodococcus Erythropolis Igts8

Biodesulfurization (BDS) is considered a complementary technology to the traditional hydrodesulfurization treatment for the removal of recalcitrant sulfur compounds from petroleum products. BDS was investigated in a bubble column bioreactor using two-phase media. The effects of various process parameters, such as biocatalyst age and concentration, organic fraction percentage (OFP), and type of sulfur compound—namely, dibenzothiophene (DBT), 4-methyldibenzothiophene (4-MDBT), 4,6-dimethyldibenzothiophene (4,6-DMDBT), and 4,6-diethyldibenzothiophene (4,6-DEDBT)—were evaluated, using resting cells of Rhodococcus erythropolis IGTS8. Cells derived from the beginning of the exponential growth phase of the bacterium exhibited the highest biodesulfurization efficiency and rate. The biocatalyst performed better in an OFP of 50% v/v. The extent of DBT desulfurization was dependent on cell concentration, with the desulfurization rate reaching its maximum at intermediate cell concentrations. A new semi-empirical model for the biphasic BDS was developed, based on the overall Michaelis-Menten kinetics and taking into consideration the deactivation of the biocatalyst over time, as well as the underlying mass transfer phenomena. The model fitted experimental data on DBT consumption and 2-hydroxibyphenyl (2-HBP) accumulation in the organic phase for various initial DBT concentrations and different organosulfur compounds. For constant OFP and biocatalyst concentration, the most important parameter that affects BDS efficiency seems to be biocatalyst deactivation, while the phenomenon is controlled by the affinities of biodesulfurizing enzymes for the different organosulfur compounds. Thus, desulfurization efficiency decreased with increasing initial DBT concentration, and in inverse proportion to increases in the carbon number of alkyl substituent groups.

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