Sulfate decomposition by bacterial leaching |
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Authors: | Nuran Deveci Cüneyt Göktug Delaloglu |
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Institution: | (1) Chemical Engineering Department, Istanbul Technical University, 80626 Maslak, Istanbul, Turkey |
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Abstract: | Sulfate disposal is the main problem of many industrial effluents, such as excess sulfuric acid, gypsum, coal desulfurization
byproducts, acid-mine waters, and general metallurgical effluents. It has been established that sulfate present in wastes
can be converted to elemental sulfur by bacterial mutualism. This study presents the results of an investigation of the industrial
feasibility of utilizing a biological system capable of converting hydrous calcium sulfate (gypsum) to elemental sulfur. Gypsum,
which was used in this study, is a byproduct of the fertilizer industry. The biological system is referred to as a bacterial
mutualism, and involvesDesulfovibrio desulfuricans for sulfate conversion andChlorobium thiosulfatophilum for hydrogen sulfide conversion. Bacterial mutualism and utilization of sulfate were investigated by means of a two-stage
anaerobic system. In the first stage, a gas purge system was used for sulfate conversion to sulfide, and it was found that
maximum conversion is 34%. In the second stage, a static culture system was used for sulfide conversion to sulfur with a conversion
of 92%. |
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Keywords: | Gypsum sulfate bioconversion Desulfovibrio desulfuricans gas purge system sulfide bioconversion Chlorobium thiosulfatophilum static culture |
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