Effect of S/N ratio on sulfide removal by autotrophic denitrification
Language English Country Germany Media print-electronic
Document type Journal Article, Research Support, Non-U.S. Gov't
- MeSH
- Ammonia metabolism MeSH
- Bioreactors microbiology MeSH
- Denitrification * MeSH
- Nitrates metabolism MeSH
- Nitrogen analysis MeSH
- Epsilonproteobacteria genetics isolation & purification metabolism MeSH
- In Situ Hybridization, Fluorescence MeSH
- Oxidation-Reduction MeSH
- Sulfur analysis MeSH
- Sulfates metabolism MeSH
- Sulfides metabolism MeSH
- Thiobacillus genetics isolation & purification metabolism MeSH
- Publication type
- Journal Article MeSH
- Research Support, Non-U.S. Gov't MeSH
- Names of Substances
- Ammonia MeSH
- Nitrates MeSH
- Nitrogen MeSH
- Sulfur MeSH
- Sulfates MeSH
- Sulfides MeSH
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.
References provided by Crossref.org