Microbial oxidation of mixtures of methylmercaptan and hydrogen sulfide |
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Authors: | Subramaniyan Anbu Kolhatkar Ravindra Sublette K L Beitle Robert |
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Institution: | (1) Center for Environmental Research and Technology, University of Tulsa, 600 S. College Avenue, 74104-3189 Tulsa, OK;(2) Department of Chemical Engineering, University of Arkansas, 72701 Fayetteville, AR |
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Abstract: | Refinery spent-sulfidic caustic, containing only inorganic sulfides, has previously been shown to be amenable to biotreatment
withThiobacillus denitrificans strain F with complete oxidation of sulfides to sulfate. However, many spent caustics contain mercaptans that cannot be metabolized
by this strict autotroph. An aerobic enrichment culture was developed from mixedThiobacilli and activated sludge that was capable of simultaneous oxidation of inorganic sulfide and mercaptans using hydrogen sulfide
(H2S) and methylmercaptan (MeSH) gas feeds used to simulate the inorganic and organic sulfur of a spent-sulfidic caustic. The
enrichment culture was also capable of biotreatment of an actual mercaptancontaining, spent-sulfidic caustic but at lower
rates than predicted by operation on MeSH and H2S fed to the culture in the gas phase, indicating that the caustic contained other inhibitory components. |
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Keywords: | Index Entries" target="_blank">Index Entries Mercaptan spent-sulfidic caustic hydrogen sulfide biotreatment |
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