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Title: Desulphurization of petroleum coke
Authors: Tripathi, Nimisha
Singh, Raj Shekhar
Gupta, Asha
Issue Date: Jun-2010
Publisher: CSIR
Abstract: The sulphur content in coal and petroleum coke varies from traces to 10% or more by weight. This exists in two forms, inorganic and organic. Sulfur in coal and rocks associated with coal mines like petroleum wastes can occur as organic sulfur, sulfate sulfur and pyritic sulfur. On combustion of coal/coke, sulphur gets released into the atmosphere and contributes to the air pollution in the form of ‘acid rain’. Organic sulphur occurs as an integral part of the molecular coal and the petroleum waste matrix and is not readily accessible for microbial attack. So, the removal of organic sulphur from coal/coke/petcoke while retaining its fuel value is most difficult. Chemical processes need a very lengthy and tedious process involving elevated temperature and pressure, which is not feasible on a technical scale. On the other hand, biological processes occur under very mild reaction conditions. Hence, the desulphurization of petroleum waste by microbial technique can be achieved in an economical and simpler way. In the present paper, a biological process using Thiobacillus thiooxidans has been described for the removal of total sulphur from Navanagar petcoke sample. The results have shown that the mean total sulphur content in the metcoke sample was 6.32%. After first bacterial leaching with T. thiooxidans 13.5% sulphur was removed by the bacteria and the remaining sulphur content in the metcoke was 5.46%. The second leaching of the previously leached petcoke sample, using T. thiooxidans resulted into sulphur removal upto 93%.
Page(s): 81-85
ISSN: 0975-2412 (Online); 0771-7706 (Print)
Source:BVAAP Vol.18(1) [June 2010]

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