关键词: 二苯并噻吩, 柴油, 脱硫, 微生物

Abstract: Due to the conventional hydrodesulfurization are less effective to remove thiophene and dibenzothiophene (DBT) types of sulfur containing compounds in diesel fuel, bio-desulfurization is being concerned. A kind of bacterial strain, HT1, using DBT as sole sulfur source and having high DBT degradation function is screened out. The optimal ferment conditions for HT1 strain are obtained by orthogonal test design as follows: treating at 30 ℃, DBT concentration of 102.0 mg/L, NH4NO3 concentration of 2.0 g/L, glycerol concentration of 5 g/L, cultivation time of 4 d with pH value of 7.0. The effect of various sulfur sources on the growth and desulfurization performance of HT1 strain is investigated. Results show that the growth of HT1 strain with various sulfur sources is similar, yet the influence of sulfur sources on the DBT degradation is significant, the best degradation performance was observed with HT1 strain using DBT as sulfur source. However, the degradation of sulfur containing compounds by HT1 strain is also depended on the structure of the compound, and the sulfur removal rate of catalytic cracking diesel fraction by HT1 strain still needs to be improved.

Key words: dibenzothiophene, diesel fuel, desulfurization, bacterium