Effect of S/N ratio on sulfide removal by autotrophic denitrification
| Autor: | Ladislav Paclik, Petr Dolejs, Josef Maca, Jana Zabranska, Dana Pokorna, Jan Bartacek |
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| Rok vydání: | 2014 |
| Předmět: |
Denitrification
Sulfide Nitrogen Inorganic chemistry chemistry.chemical_element Sulfides Applied Microbiology and Biotechnology chemistry.chemical_compound Ammonia Bioreactors Nitrate Nitrite Sulfate In Situ Hybridization Fluorescence chemistry.chemical_classification Nitrates Sulfates General Medicine Thiobacillus Sulfur chemistry Epsilonproteobacteria Oxidation-Reduction Biotechnology |
| Zdroj: | Applied Microbiology and Biotechnology. 99:2383-2392 |
| ISSN: | 1432-0614 0175-7598 |
| DOI: | 10.1007/s00253-014-6140-6 |
| Popis: | In this study a completely stirred tank reactor was used to study the effect of sulfide to nitrate (S/N) ratio on sulfide removal while nitrate was used as electron acceptor. Several S/N ratios were studied for this purpose ranging from 0.3 to 2.4 mol/mol. The complete sulfide removal was achieved when S/N ratio 0.85 mol/mol was used with the autotrophic denitrification efficiency up to 80 %. No nitrite accumulation was observed, and the main product of sulfide oxidation was sulfate. Dissimilatory nitrogen reduction to ammonia occurred and subsequently, elemental sulfur accumulated while S/N ratio was higher than 1.3 mol/mol. The specific autotrophic denitrification rates under S/N ratios 0.8 and 1.2 were 5 and 26 mg g−1 h−1 (N-NO3 −, VSS), respectively. Thiobacillus denitrificans and Thiomicrospira denitrificans were detected in the reactor by fluorescent in situ hybridization, but their overall representation was not more than 5 % of the entire microbial populations. |
| Databáze: | OpenAIRE |
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