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Abstract: For the first time, growing cells of Gordonia alkanivorans RIPI90A were used for biodesulfurization (BDS) of diesel. This process was carried out in an internal airlift bioreactor. BDS parameters (oil/water phase ratio and initial sulfur concentration) were optimized in flasks using response surface methodology. Predicted results were found to be in good agreement with experimental results. Initial sulfur concentration had a remarkable effect on BDS process. Maximum removal of sulfur (21mg/l) can be achieved at oil/water phase ratio of 25% (v/v) and initial sulfur concentration of 28mg/l. Moreover, effect of superficial gas velocity (U g) and working volume (v) on volumetric gas liquid mass transfer coefficient was studied in an airlift bioreactor for BDS of diesel. The best results were achieved at U g and v of 2.5l/min and 6.6l, respectively. Subsequently, BDS of diesel was investigated in an airlift bioreactor under optimized conditions. Sulfur reduction after 30h was 14mg/l. [Copyright &y& Elsevier]

Highlights: [•] The impact of OLR on viability and activity of activated sludge sometimes is different. [•] SMP release in the bioreactor depends on the viability of activated sludge. [•] Novel method based on capacitance was introduced for viability of activated sludge. [•] Determination of activated sludge quality is important for efficient operation of MBR. [ABSTRACT FROM AUTHOR]