توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱Behavior of the growing cells of Ralstonia eutropha in biodesulfurization of dibenzothiophene
اطلاعات انتشار: چهارمین همایش علمی مهندسی فرآیند، سال
تعداد صفحات: ۶
The new regulations to lower sulfur content in fossil fuels require new economic and efficient methods for desulfurization of recalcitrant organic sulfur. Hydrodesulfurization (HDS) of such compounds is very costly and requires high operating temperature and pressure. Biodesulfurization (BDS) is non–invasive approach that can specifically remove sulfur from refractory hydrocarbons under mild conditions and it can be potentially used in industrial desulfurization. Biodesulfurization of dibenzothiophene (DBT) by growing cells of Ralstonia eutropha in aqueous reaction system was investigated in the present study. DBT and glucose, respectively used as the sole source of sulfur and carbon for growth of R. eutropha. The effect of different initial concentrations of DBT (15 and 20 ppm) with a constant level of glucose at 10 g\L on the R. eutropha growth and its DBT desulfurization capability and pH variation was studied. Growth behavior of the bacterial cells was generally the same and no significant differences in growth rate were observed in which different initial concentrations of DBT were used. During the first eight hours of cell growth, the pH of medium was decreased. The desulfurization activity of the cells was measured with use of Gibb’s reagent and Cells cultivated in the medium containing 15 ppm of DBT showed higher desulfurization activity<\div>

۲Phenol degradation in a single chamber microbial electrolysis cell
اطلاعات انتشار: پانزدهمین کنگره ملی مهندسی شیمی ایران، سال
تعداد صفحات: ۵
In this study, a single chamber microbial electrolysis cell (MEC) using phenol as the substrate was designed to investigate the biodegradation of phenol and also electricity generation. In the MEC using phenol (120 mg\L) as the sole fuel, current was generated during phenol biodegradation with the activated sludge. Appearance of current peaks during the phenol degradation process was due to the sparging of nitrogen to the system. Therefore, these peaks were attributed to the proper mixing occurred during gas sparging which simplifies transfer of electrons accumulated in the medium to the anode and overcomes the electron transfer limitation in the system. Co–occuring with current generation, the degradation efficiency of phenol in the MEC reached about 95% within 11 days and the biodegradation rate of 0.5 mg\L.hr was obtained.<\div>

۳An airlift reactor with net draft tube for phenol biodegradation using Ralstonia eutropha
اطلاعات انتشار: پانزدهمین کنگره ملی مهندسی شیمی ایران، سال
تعداد صفحات: ۵
Biodegradation of phenol has been investigated in an airlift reactor with net draft tube (ALR–nd) at different phenol concentrations (50, 100 and 190 mg\l) and air flow rates (100, 300, and 600 mL\min) using phenol–adapted Ralstonia eutropha. The results showed that the biodegradation rate of phenol decreased at high concentration of phenol (190 mg\l) due to inhibition. On the basis of biodegradation experiments, it was observed that the optimum amount of air flow rate was 300 ml\min. The maximum biodegradation rate was 11.5 mg\l.hr which was obtained at 100 mg\l of initial concentration of phenol and 300 mL\min of air flow rate.<\div>

۴A Mini–Review on Hydrodynamics of Airlift Bioreactors with Net Draft Tube and Their Application in Pollutant Biodegradation
نویسنده(ها): ،
اطلاعات انتشار: دومین کنفرانس بین المللی یافته های نوین پژوهشی در شیمی و مهندسی شیمی، سال
تعداد صفحات: ۹
Mixing and oxygenation in tower–type bioreactors are typically driven by gas movement and as a result, these bioreactors have lower shear force as well as lower power requirement than other mechanically diven ones. This paper reviews the hydrodynamic charactersitisc of a special tower–type reactor, the airlift reactor with net draft tube (ALR–nd), and a comparison of these charactersitics was done between this modified airlift reactor with bubble column reactor (BCR) and conventional airlift reactor (ALR). The reviewed results showed that the presence of the net draft tube resulted in better liquid mixing and larger gas–liquid interfacial areas and therefore produces higher mixing efficiency and oxygen transport capability in comparison with that achievable by BCR and ALR. Also a brief review is done on the applications of ailift reactor with net draft tube for different pollutants biodegradation. The high biodegradation rates achieved and their good performance in this area made them highly potential for industrial use and a good choice for even highly toxic wastewater treatment.<\div>
نمایش نتایج ۱ تا ۴ از میان ۴ نتیجه