Effect of nitrate on sulfur transformations in sulfidogenic sludge of a marine aquaculture biofilter
| Autor: | Schwermer, C., Ferdelman, T., Stief, P., Gieseke, A., Rezakhani, N., van Rijn, J., de Beer, D., Schramm, A. |
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| Jazyk: | angličtina |
| Rok vydání: | 2010 |
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| Zdroj: | Schwermer, C U, Ferdelman, T G, Stief, P, Gieseke, A, Rezakhani, N, van Rijn, J, de Beer, D & Schramm, A 2010, ' Effect of nitrate on sulfur transformations in sulfidogenic sludge of a marine aquaculture biofilter ', F E M S Microbiology Ecology, vol. 72, no. 3, pp. 476–484 . https://doi.org/10.1111/j.1574-6941.2010.00865.x FEMS Microbiology Ecology |
| Popis: | Udgivelsesdato: 19 March 2010 The effect of NO3- addition on dissimilatory SO42- reduction and sulfide conversion inorganic-rich sludge from the digestion basin of a recirculating marine aquaculturesystem was studied. SO42- reduction could only explain a minor fraction (up to 4–9%)of the observed total sulfide production (up to 35mmol L-1 day-1), indicating that themain source of sulfide in the sludge was not SO42- reduction, but desulfuration duringthe decomposition of organic matter. Although NO3- inhibited SO42- reduction, butnot desulfuration, the primary NO3- mitigation effect was the onset of NO3--mediatedsulfide oxidation (up to 75 mmolL-1 day-1), partially to elemental sulfur (S0). AboveNO3- concentrations of 0.6mM in the bulk water, the net sulfide production andoxidation zones were moved deeper into flocs and sludge cores, which effectivelyprevented sulfide from entering the water column. However, the sulfide efflux fromthe sludge instantly recovered after NO3- depletion. Thus, the NO3- level in the watercolumn controls the zonation and magnitude of sulfur transformations in the sludge.The effect of NO3- relies therefore on its sustained presence in the water column, whichin turn depends on a well-functioning nitrification in the mariculture system. |
| Databáze: | OpenAIRE |
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