An innovative process of simultaneous desulfurization and denitrification by Thiobacillus denitrificans
article
Thiobacillus denitrificans, a species of autotrophic facultative anaerobic bacterium, was found to be capable of oxidizing sulfide into elemental sulfur when nitrate was adopted as its electron acceptor and carbon dioxide as its sole carbon source under anoxic conditions. In this way, sulfur was accumulated extracellularly and nitrate was converted into nitrogen gas. Based on these special physiological characteristics, an innovative process of simultaneous desulfurization and denitrification (SDD) was developed to obtain sulfur from sulfide. A strain of T. denitrificans, named D4, was isolated and used as sulfur producers in this study. The stoichiometric equations of SDD by T. denitrificans were also derived. The key factors affecting this process were investigated through continuous-flow and batch tests. The experimental results indicated that both the sulfide concentration and the ratio of S 2-/NO3- in the influent are key factors. Their suitable levels are suggested to be controlled less than 300 mg/L and 5/3-5/2, respectively, to achieve a high sulfur conversion degree. Copyright © Taylor & Francis Inc. Chemicals / CAS: carbon dioxide, 124-38-9, 58561-67-4; carbon, 7440-44-0; nitrate, 14797-55-8; nitrogen, 7727-37-9; sulfide, 18496-25-8; sulfur, 13981-57-2, 7704-34-9; Nitrates; Sulfides; Sulfur, 7704-34-9
Topics
Biological desulfurizationDenitrificationS2-/NO3- ratioSulfurThiobacillus denitrificansBacteriaCarbon dioxideConcentration (process)DenitrificationStoichiometrySulfide mineralsAnoxic conditionBiological desulfurizationS2/NO3-ratioThiobacillus denitrificansDesulfurizationcarboncarbon dioxidenitratenitrogensulfidesulfuranaerobic bacteriumconference paperdenitrificationdesulfurizationion exchange chromatographynonhumanstoichiometrytechniqueThiobacillus denitrificansNitratesOxidation-ReductionSulfidesSulfurThiobacillusWaste Disposal, FluidWater PurificationBacteria (microorganisms)Thiobacillus denitrificans
TNO Identifier
238757
ISSN
10934529
Source
Journal of Environmental Science and Health - Part A Toxic/Hazardous Substances and Environmental Engineering, 40(10), pp. 1939-1949.
Pages
1939-1949
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