Feasibility Study for Biodesulfurization of DBT as Sulfur Model Compound of Gas Oil by Pseudomonas aeruginosa Supported on Poly vinyl alcohol

Desulfurization of fossil fuels such as gasoil  is one of the important factors in pollution control of the environment because of sulfur dioxide emission due to combustion into the atmosphere. Conventional methods for desulfurization of gasoil for its aromatic contents have been considered. To this approach,biodesulfurization methods have been examined  for desulfurization of sulfur containing  aromatic compounds. Pseudomonas aeruginosa supported on poly vinyl alcohol has been used for biodesulfurization of dibenzothiophene as gasoil model compound in n-hexane as  the solvent . The obtaining results according to UV-Spectrophotometer analysis at 325 nm showed that 93.8 % of DBT at the optimum condition of primary concentration about 20 ppm , pH= 7 ,adsorbent dose of 0.5 g, in 35°C and after 7 hrs of contact time has been removed. Equilibrium data and adsorption kinetics have been observed to obey the Freundlich isotherm and pseudo first-order kinetic models, respectively. Also the recovery of suppored biomass has been investigated.The alteration in surface morphology of biosorbent after supporting on polymer was investigated by FT-IR  spectroscopy and SEM images.