Bioconversion of High Concentrations of Hydrogen Sulfide to Elemental Sulfur in Airlift Bioreactor
| Autor: | Madbuli H. Noweir, Fadia A. El-Marakby, Mohamed A. Zytoon, Abdulraheem A. Al-Zahrani |
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| Rok vydání: | 2014 |
| Předmět: |
Article Subject
Sulfide Bioconversion Microorganism Hydrogen sulfide lcsh:Medicine chemistry.chemical_element lcsh:Technology Oxygen General Biochemistry Genetics and Molecular Biology chemistry.chemical_compound Bioreactors Bioreactor Hydrogen Sulfide lcsh:Science General Environmental Science chemistry.chemical_classification lcsh:T Chemistry business.industry lcsh:R technology industry and agriculture Airlift General Medicine Hydrogen-Ion Concentration equipment and supplies Sulfur Biotechnology Environmental chemistry lcsh:Q business Research Article |
| Zdroj: | The Scientific World Journal The Scientific World Journal, Vol 2014 (2014) |
| ISSN: | 1537-744X 2356-6140 |
| DOI: | 10.1155/2014/675673 |
| Popis: | Several bioreactor systems are used for biological treatment of hydrogen sulfide. Among these, airlift bioreactors are promising for the bioconversion of hydrogen sulfide into elemental sulfur. The performance of airlift bioreactors is not adequately understood, particularly when directly fed with hydrogen sulfide gas. The objective of this paper is to investigate the performance of an airlift bioreactor fed with high concentrations of H2S with special emphasis on the effect of pH in combination with other factors such as H2S loading rate, oxygen availability, and sulfide accumulation. H2S inlet concentrations between 1,008 ppm and 31,215 ppm were applied and elimination capacities up to 113 g H2S m−3 h−1were achieved in the airlift bioreactor under investigation at a pH range 6.5–8.5. Acidic pH values reduced the elimination capacity. Elemental sulfur recovery up to 95% was achieved under oxygen limited conditions (DO < 0.2 mg/L) and at higher pH values. The sulfur oxidizing bacteria in the bioreactor tolerated accumulated dissolved sulfide concentrations >500 mg/L at pH values 8.0–8.5, and near 100% removal efficiency was achieved. Overall, the resident microorganisms in the studied airlift bioreactor favored pH values in the alkaline range. The bioreactor performance in terms of elimination capacity and sulfur recovery was better at pH range 8–8.5. |
| Databáze: | OpenAIRE |
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