Implications of volatile fatty acid profile on the metabolic pathway during continuous sulfate reduction
| Autor: | Sueli Moura Bertolino, Sergio Francisco de Aquino, Versiane Albis Leão, Isabel C.B. Rodrigues, Renata Guerra-Sá |
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| Rok vydání: | 2012 |
| Předmět: |
Environmental Engineering
Inorganic chemistry Management Monitoring Policy and Law chemistry.chemical_compound Bioreactors Propionate Lactic Acid Food science Sulfate Waste Management and Disposal chemistry.chemical_classification biology Sulfates Fatty acid General Medicine Fatty Acids Volatile biology.organism_classification Desulfovibrio chemistry Metabolic pathways Fermentation Carbon dioxide Sulfate reduction Lactate Desulfotomaculum Propionates Anaerobic exercise |
| Zdroj: | Repositório Institucional da UFOP Universidade Federal de Ouro Preto (UFOP) instacron:UFOP |
| ISSN: | 0301-4797 |
| DOI: | 10.1016/j.jenvman.2012.02.022 |
| Popis: | Volatile fatty acid (VFA) profile is an important parameter in anaerobic reactors because it enables the assessment of metabolic pathways. Volatile fatty acids were monitored during sulfate reduction in a UASB (upflow anaerobic sludge blanket) reactor treating 2 g/L sulfate concentration and with the organic loading increasing from 3.5 kg COD/m 3 d to 5.9 kg COD/m 3 d, for a 1-day residence time. In the absence of recirculation, the best outcome (65% reduction) was noticed with the lowest organic loading (3.55 kg/m 3 d). When recirculation was applied, sulfate reduction yields increased to 89%, corresponding to a sulfate removal rate of 1.94 kg SO 4 2− /m 3 d. The reactor performance was discussed in relation to microbial diversity and metabolic pathways. At high organic loading, two metabolic pathways account for lactate degradation: (i) lactate is oxidized to acetate and carbon dioxide by the incomplete-oxidizer SRB (sulfate-reducing bacteria) Desulfomonas , Desulfovibrio , Desulfolobus , Desulfobulbus and Desulfotomaculum spp.; (ii) lactate is converted to acetate by fermenting bacteria such as Clostridium sp. High propionate concentrations imply that there are low sulfate reduction efficiencies. |
| Databáze: | OpenAIRE |
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