Abstract
AbstractBACKGROUNDThe presence of sulfur in oils causes losses in the refining process and occasions the emission of toxic gases during fuel combustion. Biodesulfurization (BDS) is a bioprocess where some bacteria selectively remove sulfur from heterocyclic compounds. However, there are some limitations to BDS industrial application such as the high costs of the nutritional medium compounds. Previous studies with Rhodococcus erythropolis ATCC 4277 strain showed that the carbon and nitrogen concentration in culture medium significantly affected heavy gas oil (HGO) desulfurization. The aim of this present work was to optimize the nutritional medium in order to reduce the costs associated with medium formulation. The replacement of a synthetic medium by waste (cassava waste) and byproducts (trub) was also evaluated.RESULTSRhodococcus erythropolis ATCC 4277 desulfurization capacity was improved by diminishing carbon source concentration from the synthetic nutritional medium. Both trub and cassava waste led to a high desulfurization rate. About 70% of sulfur compounds were removed to the three media tested, achieving a maximum desulfurization rate of 5.0×103 mg sulphur kg−1 HGO h−1.CONCLUSIONThe use of an optimized nutritional medium, cassava wastewater and trub can provide an improved methodology for BDS making potential applications in industry feasible. © 2017 Society of Chemical Industry
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