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When using Thiobacillus ferrooxidans bacteria, the best results were obtained with desulfurization carried out on coal samples making 2.4 wt% of the extraction mixture at the initial concentration ...
The leaching of pyrite sulfur from coal employing Thiobacillus Ferrooxidans was studied in a continuous stirred tank reactor at a variety of dilution rates (0.02-0.11 h(-1)) and coal surface areas (0.25-1.0 m(2)/mL). The bacterial leaching rate was found to increase with increasing coal surface area concentration and increasing dilution rate.
Microbial desulfurization might be developed as a new process for the removal of pyrite sulfur from coal sluries such as coal-water mixture (CWM). An application of iron-oxidizing bacterium Thiobacillus ferrooxidans to flotation would shorten the periods of the microbial removal of pyrite from some weeks by leaching methods to a few minutes.
Microbial desulfurization of coal for removing up to 50 3< of total sulfur from coal offers a method prior to combustion in a powerplant. Microbial removal of pyritic sulfur from coal is accomplished by two families of aerobic and acidophilic bacteria. Thiobacillus ferrooxidans is one family of bacteria used. Authors: Detz, C M [1]; Barvinchak, G.
A. ferrooxidans is a Gram negative rod shaped bacterium that is commonly found in deep caves or acid mine drainage, such as coal waste (10, 11, 12). These acidophilic bacteria thrive in optimal pH level of 1.5 – 2.5 where they convert insoluble metals to their soluble state. Even low concentrations (ppm) of these metallic ions would be ...
The biodesulfurization of coal was first investigated with pure cultures of Acidithiobacillus ferrooxidans [20,21], Acidithiobacillus thiooxidans [22] and Sulfolobus acidocaldarius [23,24] and...
Microbial desulfurization of Illinois #6 and Indiana #3 bituminous coal having a total sulfur content of 2 to 8% has been investigated using acidophilic microorganism, Thiobacillus ferrooxidans, in l...
Since desulfurization of coal mainly involves oxidation of the pyrite, a kinetic model of Fe 2+ oxidation by Thiobacillus ferrooxidans bacteria was proposed. The process was found to be described well by the equation derived for autocatalytic reaction of the first-order, both towards the inorganic substrate (Fe 2+ ) and the biocatalyst (protein).
Several different microorganisms have been suggested for coal desulfurization. In the present investigation, the thermophilic archaea Acidianus brierleyi (DSM 1651), Sulfolobus acidocaldarius (DSM 639) and Sulfolobus solfataricus (DSM 1616) were compared with the mesophilic bacterium Thiobacillus ferrooxidans (DSM 583) concerning their capability of removing sulfur from coal.
The U.S. Department of Energy's Office of Scientific and Technical Information
The desulfurization rate of organic sulfur was better than most of the reported results, 27-29 which indicated that the strain SX-12 has a good ability of organic sulfur removal. However, the desulfurization rate is lower than the shake flask test result, which may be a more complete contact area between bacteria and coal in the shaking test.
desulfurization of coal Fikret Kargi As a result of acid rain problems, desulfurization of coal has been given increasing attention in recent years. ... ferrooxidans 15-17 and almost all strains have been isolated from acid mine waters. These bacteria are Gram-negative rods (0.5 by 1-2 ~tm), flagellated, non-spore-forming 16-18, ...
The biological desulfurization of coals was studied with pure cultures of mesophilic ( Thiobacillus ferrooxidans and T. thioodixans) or thermophilic ( Sulfolobus brierleyi) bacteria and acid mine water. These microorganisms were used with coals ranging in sulfur contents from 2 to 6%. The extent of removal of sulfur, ash and iron from coal was ...
Microbial desulfurization of Illinois #6 and Indiana #3 bituminous coal having a total sulfur content of 2 to 8% has been investigated using acidophilic microorganism, Thiobacillus ferrooxidans, in laboratory shake flash experiments and in a two-inch pipeline loop. The results indicate that about 80 …
Since desulfurization of coal mainly involves oxidation of the pyrite, a kinetic model of Fe 2+ oxidation by Thiobacillus ferrooxidans bacteria was proposed. The process was found to be described well by the equation derived for autocatalytic reaction of the first-order, both towards the inorganic substrate (Fe 2+) and the biocatalyst (protein).
U.S. Department of Energy Office of Scientific and Technical Information. Search terms: Advanced search options. ...
Coal can contain undesirable sulfur compounds created by natural weathering processes. This undesirable sulfur can be solubilized by A. ferrooxidans and removed by washing techniques; this process is known as desulfurization (20). Furthermore, these techniques have shown significant promise in a few other areas.
Collaborative treatment high sulfur coal sample by using native bacterium DP06 and Thiobacillus ferrooxidans was studied and demonstrated 59% of total sulfur removed from the coal sample.
10.1002/bit.260410611.abs Microbial desulfurization might be developed as a new process for the removal of pyrite sulfur from coal sluries such as coal–water mixture (CWM). An application of iron‐oxidizing bacterium Thiobacillus ferrooxidans to flotation would shorten the periods of the microbial removal of pyrite from some weeks by leaching methods to a few …
(1994). Microbial desulfurization of coal by chaemoautotrophic thiobacillus ferrooxidans‐an iron mine isolate. Journal of Environmental Science and Health . Part A: Environmental Science and Engineering and Toxicology: Vol. 29, No. 10, pp. 2045-2061.
The leaching of pyrite sulfur from coal employing Thiobacillus Ferrooxidans was studied in a continuous stirred tank reactor at a variety of dilution rates (0.02-0.11 h(-1)) and coal surface areas ...
The U.S. Department of Energy's Office of Scientific and Technical Information
T. Ferrooxidans specifically is useful in lowering the quantities of pyrite sulphur in coal. T. Ferrooxidans rapidly oxidises coarse crystalline marcasite and fine crystals of iron pyrite. However, these bacteria often produce an auto-toxic (self-destructive) metabolic breakdown-product (usually certain acids) that do not allow additional ...
recently, dugan and apel (1978) achieved an almost complete removal of pyrite from coal by using a mixed culture of thiobacillus ferrooxidans and thiobacillus thiooxidans capes et al. (1973) reported that the surface properties of pyrite and coal were changed during the microbiological leaching to such an extent that the separation of pyrite from …
for the pre-combustion desulfurization of coal, but biotechnology may provide a solution. One of the major sources of the environmental problem known as acid rain is sulfur emissions from the ... ferrooxidans 1-3, Thiobacillus thio- oxidans 3'4 and Sulfolobus acido- caMarius 5. The microbiological pro- cess can remove 90% or more of ...
The results showed that the coal desulfurization rate was up to 72.4% after bioleaching for 13 d by A. ferrooxidans LX5 acclimated by pyrite, at the same time, the desulfurization rate was only 47.2% with A. ferrooxidans LX5 cultured with ferrous sulfate and reached 65.8% in 20 d. ... Therefore, the desulfurization efficiency can be improved of ...
Abstract Literature on the possibility of desulfurizing coal by microbiological leaching is limited. The earliest report was that of Zarubina et al. (1959) who indicated that 23 to 27% of sulfur was removed from their coal samples in 30 days.
