Investigating the ability of sulfur oxidizing strains in biodesulfurisation of sulfide-containing streams, screening the most capable strain and determining the optimum condition for elemental sulfur recovery from sulfide using response surface method

Published on Feb 1, 2022in Fuel6.609
· DOI :10.1016/J.FUEL.2021.121985
Reza Peighami1
Estimated H-index: 1
(RIPI: Research Institute of Petroleum Industry),
Behnam Rasekh14
Estimated H-index: 14
(RIPI: Research Institute of Petroleum Industry)
+ 2 AuthorsHanif Khodaverdi (RIPI: Research Institute of Petroleum Industry)
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Abstract
Abstract null null Beside numerous chemical methods, biological methods were developed to remove sulfide from streams using Sulfur Oxidizing Bacteria (SOB). Because of the wide variety of such bacteria and deep difference in their capability, the ability of seven well-known SOBs were investigated. According to the results T. versutus and T. aerophilum were selected as capable bacteria for further experiments. The valuable product of sulfide oxidation is elemental sulfur, the production of sulfur in the culture medium was considered as the basis for selecting the appropriate bacteria. Evaluations of bacteria showed that T. aerophilum was not able to produce elemental sulfur and only produced sulfate as its final product. However, by creating oxygen restriction conditions, sulfur production is observed for T. versutus. Therefore, the continuation of experiments on the optimization of sulfur production in the culture medium of T. versutus was investigated. Due to the fact that the amount of dissolved oxygen in bioreactor can be controlled by changing the stirrer speed, the stirrer speed was considered as one of the parameters. In these experiments, sulfide ion concentration and initial agitator speed were considered as variables and sulfur production as a response. Experiments were designed using Design Expert software and RSM method. The results of optimization experiments showed that the concentration of 10000 mg/L of sulfide and the stirrer speed of 130 rpm led to the production of elemental sulfur of 1600 mg/L. Therefore, 40% of the incoming sulfide is converted to sulfur.
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Abstract Haloalkaliphilic biological desulfurization is attracting people's attention due to its remarkable economy and good performance. In this study, a bio-desulfurizing system was developed based on a sulfur-oxidizing bacterium Thioalkalivibrio versutus D301 to treat H2S under haloalkaliphilic conditions. Results showed the optimum performance of the system was obtained under sulfide load of 3.27 g/L/d and oxidization-reduction potential (ORP) value of −395 mV. The selection of elemental sul...
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Salinity negatively affects growth of sulfur-oxidizing bacteria (SOB) and their sulfate production ability, meanwhile decreases the available sulfate for plants in soil. The aim of this study was t...
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BACKGROUND: Some liquid industrial wastes are rich in sulfur (S), nitrogen (N) and organic matter, causing eutrophication of lakes and rivers. These wastes also are highly toxic to aquatic organisms and pose serious health problems. Biological N removal is performed by denitrification. Heterotrophic denitrifiers oxidize organic matter to CO₂ gas and reduce nitrate (NO₃⁻) to N₂ gas, whereas autotrophic denitrifiers oxidize reduced S compounds by reducing nitrate. Thus, a simultaneous denitrificat...
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Abstract We studied a biotechnological desulfurization process for removal of toxic hydrogen sulfide (H2S) from sour gas. The process consists of two steps: i) Selective absorption of H2S into a (bi)carbonate solution in the absorber column and ii) conversion of sulfide to sulfur by sulfide oxidizing bacteria (SOB) in the aerated bioreactor. In previous studies, several physico-chemical factors were assessed to explain the observed enhancement of H2S absorption in the absorber, but a full explan...
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Abstract The gradual depletion of fossil fuels along with the need to use renewable energy sources to mitigate climate change has triggered the development of biomethane as a green alternative of natural gas, where biomethane is obtained via upgrading the biogas obtained by anaerobic digestion of organic substrates. Overall, the inherent presence of multiple contaminants in biogas (CO2, H2S, and siloxanes) requires an effective purification prior injection into natural gas grids or use as a vehi...
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