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biodesulfurization
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Biodesulfurization of the tabas deposit coal by microorganisms
, Article Journal of Mining Science ; Volume 40, Issue 3 , 2004 , Pages 310-320 ; 10627391 (ISSN) ; Rezai, B ; Vossoughi, M ; Osanloo, M ; Sharif University of Technology
2004
Abstract
The results are presented for the investigations of sulfur removal from coal by a mixed culture of microorganisms. Optimal conditions of the process are established (pH, size of coal particles, pulp density, temperature, etc.). They make it possible to reduce the content of pyrite and total sulfur by 91.84 and 53.5%, respectively. The decrease in ash content of coal under its leaching is noted. © 2004 Springer Science+Business Media, Inc
Biodesulfurization of dibenzothiophene by a newly isolated thermophilic bacteria strain
, Article Iranian Journal of Chemistry and Chemical Engineering ; Volume 25, Issue 3 , 2006 , Pages 65-72 ; 10219986 (ISSN) ; Yaghmaei, S ; Mousavi, S.M ; Jadidi, A.R ; Sharif University of Technology
2006
Abstract
Microbiological analyses of soil chronically exposed to petroleum complex compounds of some oil springs in south of Iran resulted in isolation and purification of a new native thermophilic strain which is capable to desulfurize petroleum sulfur compounds by 4-S mechanism. Dibenzothiophene (DBT) was selected as a complex sulfiir compound model and many experiments were done to identify the metabolic pathway. The results of these experiments show that DBT is ultimately converted to 2-hydroxybiphenyl (2-HBP) and sulfite. This is a special metabolic pathway in that there is no effect on the carbon skeleton of organic compounds and would be ideal for desulfurization to upgrade the petroleum...
Biodesulfurization of hydrocarbons and diesel fuels by Rhodococcus sp. strain P32C1
, Article Biochemical Engineering Journal ; Volume 8, Issue 2 , 2001 , Pages 151-156 ; 1369703X (ISSN) ; Vossoughi, M ; Kheirolomoom, A ; Tanaka, E ; Katoh, S ; Sharif University of Technology
2001
Abstract
The ability of Rhodococcus sp. P32C1 for desulfurization of n-hexadecane (n-C16) containing dibenzothiophene (DBT), and two different diesel oils is evaluated. Cells cultivated in the medium containing DBT of 0.1 mM showed higher desulfurization activity, and the effects of cell concentration on the desulfurization reaction were studied. Three hydrocarbon-aqueous phase ratios of 25, 50 and 75 vol.% were used for desulfurization of n-C16 containing 1 and 24mM of DBT as a sulfur source. The maximum specific production rate of 2-hydroxybiphenyl (2-HBP) in two-phase system was 43.5 mmol/(kg dry cell.h). Based on the optimum conditions determined for desulfurization of n-C16, diesel oils with...
Selective desulfurization of dibenzothiophene by newly isolated Corynebacterium sp. strain P32C1
, Article Biochemical Engineering Journal ; Volume 5, Issue 1 , 2000 , Pages 11-16 ; 1369703X (ISSN) ; Kheirolomoom, A ; Vossoughi, M ; Tanaka, E ; Katoh, S ; Sharif University of Technology
2000
Abstract
Corynebacterium sp. strain P32C1 was selected from 30 strains isolated from soil samples of various areas in Iran on the basis of the ability to utilize dibenzothiophene (DBT) as a sole source of sulfur. During 27 h of cultivation in a jar-fermentor, DBT with an initial concentration of 0.25 mM was completely converted to 2-hydroxybip henyl (2HBP). Concentration change of 2'-hydroxybiphenyl-2-sulfinate (HBPS) during cultivation showed the general characteristics of reactions in series, DBT → HBPS → 2HBR. With resting cells prepared in late exponential phase, DBT of 0.5 mM was completely converted to 2HBP during 30 min, and the maximum specific production rate of 2HBP was 37 mmol/(kg dry...
A review on the methods in diesel desulfurization
, Article Current Analytical Chemistry ; Volume 17, Issue 6 , 2021 , Pages 815-830 ; 15734110 (ISSN) ; Ahmad, S ; Tahir, Z ; Ul Hassan, S ; Ali, Z ; Akhtar, M. N ; Azam, K ; Abdullah, M. O ; Sharif University of Technology
Bentham Science Publishers
2021
Abstract
Background: Diesel mainly consists of paraffin and thio-aromatic compounds. Sulfur present in diesel exhaust is the major challenge for oil refineries. Sulfur is an oxidizing element that discharges as acute pollutant in the environment, having adverse effects on human and animal life. Introduction: The scope of this review paper is to discuss and highlight the recent advancements in the process of desulfurization of diesel oil to explore the less energy-intensive and more economical process. Methods: Recently, different techniques are widely used for desulfurization of diesel oil to remove sulfur containing compounds from diesel. These techniques mainly involve hydrodesulfurzation,...
Bioremediation of Contaminated Soil by Hydrocarbon
, M.Sc. Thesis Sharif University of Technology ; Shaygan, Jalaloddin (Supervisor)
Abstract
This research was done in order to test the capability of endemic microorganisms in treating hydro-carbonic pollutants found in the soil specimens of Assaluye industrial region. To find the optimum conditions for treating the contaminations, we tried several amounts of substrate as well as temperature and humidity. The total concentration of hydrocarbon compounds in polluted soil samples was measured by both infrared spectrometry and gas chromatography, in treatment process after extraction. The results show that, having 50mg substrate per 1kg of contaminated soil added and keeping humidity at 11%, in a 60-days course the level of initial pollution decreased by 60%. 10 degrees increase in...
Biodesulfurization of Light Fuel Oil
, M.Sc. Thesis Sharif University of Technology ; Farhadi, Fatollah (Supervisor) ; Molaei, Asghar (Supervisor) ; Arabeyan, Daruosh (Co-Advisor)
Abstract
Biological removal of sulfur compounds from petroleum is one of the major attractions of environmental technologies in the oil industry. Inefficient sulfur removal in refining processes causes sulfur oxides (SOx) production after combustion, which has adverse effects on the environment.Today the most common way to remove sulfur from crude oil is Hydrodesulfurization which has poor performance in removing some heterocyclic compounds such as thiophenes. Increase the amount of sulfur in the remaining oil reserves and the other hand, more stringent environmental regulations, has led researchers to development and invent new methods for desulfurization. Biological desulfurization is one of these...
Assessment of desulfurization of natural gas by chemoautotrophic bacteria in an anaerobic baffled reactor (ABR)
, Article Chemical Engineering and Processing: Process Intensification ; Volume 45, Issue 3 , 2006 , Pages 232-237 ; 02552701 (ISSN) ; Vossoughi, M ; Soltanieh, M ; Sharif University of Technology
2006
Abstract
The purpose of this study is to evaluate an anaerobic system (ABR) cultured by chemoautotrophic bacteria for biodesulfurization of natural gas. In this study anaerobic baffled reactor with five compartments and active volume of 10 l was used. For increasing solid retention time, reactor was packed by pumice with 0.5-2 cm diameter which active volume decreased to 9 l. Inoculation was performed by activated sludge from municipal sewage treatment, which was kept in anaerobic condition for 1 year. The synthetic wastewater which contains S2O32- ion was used in start-up and S -2 for running of ABR. Performance of the reactor was evaluated at three equivalent hydraulic retention times (HRT) of 50,...
Computational Fluid Dynamic (CFD) of Fixed-Bed Reactor for Bio-treatment of Sulfur from Petroleum Cuts
,
M.Sc. Thesis
Sharif University of Technology
;
Yaghmaei, Soheila
(Supervisor)
Abstract
Bio-desulfurization is the sulfur removal process from organosulfur compounds by the action of microorganisms (which are capable of removing sulfur). Too many studies have been carried out in the use of biocatalysts for BDS process. In this project, we have used data obtained from a previous experiment in which a trickle bed reactor (diameter: 0.066 m, height: 0.6 m) and a Rhodococcus sp. 12891 starin immobilized on bed particles are used to produce diesel with low sulfur content. Sulfur concentration of inlet diesel is between 200ppm to 540 ppm. parameters of process are recycle Ratio , volumetric flow rate and sulfur content of inlet diesel.
A mathematical model for trickle bed...
A mathematical model for trickle bed...
Study of a newly isolated thermophilic bacterium capable of Kuhemond heavy crude oil and dibenzothiophene biodesulfurization following 4S pathway at 60°C
, Article Journal of Chemical Technology and Biotechnology ; Volume 83, Issue 12 , June , 2008 , Pages 1689-1693 ; 02682575 (ISSN) ; Shayegan, J ; Yaghmaei, S ; Alemzadeh, I ; Sharif University of Technology
2008
Abstract
Background: To meet stringent emission standards stipulated by regulatory agencies, the oil industry is required to bring down the sulfur content in fuels. As some compounds cannot be desulfurized by existing desulfurizing processes (such as hydrodesulfurization, HDS) biodesulfurization has become an interesting topic for researchers. Most of the isolated biodesulfurizing microorganisms are capable of desulfurization of refined products whose predominant sulfur species are dibenzothiophenes so biocatalyst development is still needed to desulfurize the spectrum of sulfur-bearing compounds present in whole crude. Results: The first desulfurizing bacterium active at 60 °C has been isolated,...
Biodesulfurization of dibenzothiophene by a newly isolated Rhodococcus erythropolis strain
, Article Bioresource Technology ; Volume 101, Issue 3 , 2010 , Pages 1102-1105 ; 09608524 (ISSN) ; Vosoughi, M ; Ziaee, A. A ; Sharif University of Technology
2010
Abstract
A new dibenzothiophene (DBT) desulfurizing bacterium was isolated from oil-contaminated soils in Iran. HPLC analysis and PCR-based detection of the presence of the DBT desulfurization genes (dszA, dszB and dszC) indicate that this strain converts DBT to 2-hydroxybiphenyl (2-HBP) via the 4S pathway. The strain, identified as Rhodococcus erythropolis SHT87, can utilize DBT, dibenzothiophene sulfone, thiophene, 2-methylthiophene and dimethylsulfoxide as a sole sulfur source for growth at 30 °C. The maximum specific desulfurization activity of strain SHT87 resting cells in aqueous and biphasic organic-aqueous systems at 30 °C was determined to be 0.36 and 0.47 μmol 2-HBP min-1 (g dry cell)-1,...