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Biodesulfurization(BDS) is a promising technology for deep desulfurization.In this work,Pseudomo-nas delafieldii R-8 cells are immobilized in calcium alginate beads and used for BDS of transportation fuels.It is found that thiophene and dibenzothiophene(DBT) can be simultaneously metabolized by immobilized R-8 cells.The initial sulfur content in the model oil is 300 mg?kg?1(thiophene︰DBT 1︰1).After 10 h of treatment,the thiophene concentration is reduced by 40%,while DBT is reduced by 25%.The utilization rate of thiophene is faster than that of DBT.Moreover,the oil/water ratio of alginate immobilized cells is studied to reduce the water volume in desulfurization systems.Long-term recycling of BDS by alginate immobilized cells is carried out with oil/water ratio at 5︰1.The immobilized cells are successfully reused over 15 batch cycles.In the last batch,the desulfurization activity remains at least 75% of the first batch.
Biodesulfurization (BDS) is a promising technology for deep desulfurization.In this work, Pseudomo-nas delafieldii R-8 cells are immobilized in calcium alginate beads and used for BDS of transportation fuels. It is found that thiophene and dibenzothiophene (DBT) can be simultaneously metabolized by immobilized R-8 cells. The initial sulfur content in the model oil is 300 mg? kg? 1 (thiophene: DBT 1: 1). After 10 h of treatment, the thiophene concentration was reduced by 40% is reduced by 25%. The utilization rate of thiophene is faster than that of DBT. Moreover, the oil / water ratio of alginate immobilized cells is studied to reduce the water volume in desulfurization systems. Long-term recycling of BDS by alginate immobilized cells is carried out with oil / water ratio at 5 ︰1. The immobilized cells are successfully reused over 15 batch cycles. In the last batch, the desulfurization activity remains at least 75% of the first batch.