Abstract
In this study, low-rank lignite coal sample collected from Lenger coal deposit (Turkestan province) in Kazakhstan was subjected to desulfurization by using three bacterial strains isolated from soil with silt and coal itself. The molecular identification of the 16S rRNA gene revealed that the isolated bacteria wereAtlantibactersp.,Pseudomonassp.,Bacillussp. denoted as S1, S2, and T1, respectively.Pseudomonassp. showed the best result in removing organic sulfur (93%) and total sulfur (52%), whileBacillussp. was effective in removing pyritic sulfur (19%) compared to other strains. However,Atlantibactersp. had no significant influence on sulfur content after treatment, thereby reducing its chances to be used in decreasing sulfur content in lignite in future investigations. Additionally, this research would be valuable to develop an innovative biotechnological method for producing an environmentally friendly briquetted smokeless fuel from lignite.
Highlights
The coal industry is one of the main sectors of the economy in many countries of the world
S1 is identified as Atlantibacter sp. and this sample was isolated from soil with silt
S2 is identified as Pseudomonas sp. and this sample was taken from soil with silt
Summary
The coal industry is one of the main sectors of the economy in many countries of the world. Coal is used as a fuel, for the manufacture of building materials, in medicine and the chemical industry. Its extraction, processing and use lead to environmental pollution. The development of high-tech coal business and the implementation of new growth points, such as coal enrichment, coal gasification, coal hydrogenation, methane extraction from coal beds, catalytic processing of methane, etc. Are becoming important for the future of the coal industry. The enrichment of coal is always aimed at removing ash and reducing sulfur in coal, since sulfur is considered a harmful component of coal for many reasons. With an increase in sulfur content, the heat of combustion of coal decreases, the amount of sulfur dioxide in flue products released into the surrounding atmosphere increases. Emissions of sulfur compounds cause morbidity and mortality in humans; the death of coniferous trees; acid rain; decrease in crop yields in agriculture, etc
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