Biodesulfurization from the high sulfur coal with a newly isolated native bacterium, Aspergillus sp. DP06

Abstract

In this paper, we made attempt to desulfurize the coal collected from Yihai coalfield of Qinghai province in China contains high total sulfur content (4.97% by mass) and high organic sulfur content (3.37% by mass). The high sulfur coal sample was subjected to desulfurization by using a new bacterium isolated from the native coal mine site. The molecular identification of the 18S rRNA gene showed that the native bacterium was Aspergillus sp., denoted as DP06, and it is reported first time for the capability to remove about 47% of total sulfur from the coal. To improve biodesulfurization performance, the effect of various parameters such as medium pH, pulp density, incubation time, and incubation temperature on the desulfurization was investigated and the optimal values were found as pH 5.0, 5% of pulp density, 8 days, and 35°C, respectively. Final total sulfur content of the desulfurized coal with DP06 was reduced to 2.63% (organic sulfur 1.45% + pyritic sulfur 0.53% and 0.65% of sulfate sulfur). 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. Results of analytical characterization have indicated that the treatment of high sulfur coal with native bacterium DP06 has caused the increase in calorific value from 6329 cal/g to 6521 cal/g, but the ash content of coal was eliminated. © 2016 American Institute of Chemical Engineers Environ Prog, 36: 595–599, 2017

Biodesulfurization of coal using Rhodococcus erythropolis SX‐12 and Acidithiobacillus ferrooxidans GF: A two‐step approach

“…From Figure 5B, the total desulfurization rate of 38.78% was obtained after 15 days of leaching experiment, removal of organic sulfur of 81.45%, and removal of inorganic sulfur of 10.38%. The desulfurization rate of organic sulfur was better than most of the reported results, [27][28][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.…”

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Sulfur Removal from Coal with The Basic Extraction Liquid of Oak Ash

“…They used K-edge X-ray absorption near-edge structures to analyze the changes in the form of sulfur before and after desulfurization and found that the pyritic sulfur content of the coal decreased from 53.6% to 39.2%. Liu et al (2017) observed desulfurization of Yihai coalfield contains 4.97% total sulfur content. After desulfurization process with a newly isolated native bacterium Aspergillus sp.…”

An effective method to remove organic sulfur in coal: Effects on the physicochemical properties and combustion kinetics

“…Using a newly isolated heterotrophic bacterial strain Fusarium oxysporum FE, Etemadzadeh et al 4 removed 34.21% of sulfur from high‐sulfur coal collected from the Zobahan Factory in Isfahan. Also, Liu et al 12 investigated the bioleaching of Yihai coals and obtained a maximum total sulfur removal of 47% by using a fungal strain, Aspergillus sp. DP06.…”