Anaerobic degradation of anionic surfactants by indigenous microorganisms from sediments of a tropical polluted river in Brazil
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| Format: | Artículo científico |
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Universidad de Costa Rica
2015
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| _version_ | 1876440163021750272 |
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| author | Iolanda Cristina Silveira Duarte |
| author_facet | Iolanda Cristina Silveira Duarte |
| contents | Anaerobic degradation of anionic surfactants by indigenous microorganisms from sediments of a tropical polluted river in Brazil Iolanda Cristina Silveira Duarte Paula de França Dagoberto Yukio Okada Pierre Ferreira do Prado Maria Bernadete Amancio Varesche Biología nitrate bacteria Anaerobic surfactant degradation Linear alkylbenzene sulfonate (LAS) is widely used in the formulation of domestic and indus trial cleaning products, the most synthetic surfactants used worldwide. These products can reach water bodies through the discharge of untreated sewage or noneffective treatments. This study evaluates the ability of the microorganisms found in the Tietê river sediment to degrade this synthetic surfactant. The experiment was conducted in a bioreactor, operated in batch sequences under denitrifying conditions, with cycles of 24 hours and stirring at 150rpm, using 430mL of sediments and 1 070mL of a synthetic substrate consisting of yeast extract, soluble starch, sodium bicarbonate and sucrose. LAS was added at different concentrations of 15mg/L and 30mg/L. The reactor operation was divided into the biomass adaptation to the synthetic substrate without LAS and three experimental conditions: a) addition of 15mg/L of LAS; b) 50% reduction the cosubstrate concentration and 15mg/L of LAS, and c) addition of 30mg/L of LAS and 100% cosubstrate concentration. The results showed that the degradation efficiency of LAS was directly related to the addition of cosubstrates and the population of denitrifying bacteria. The removal of LAS and nitrate can be achieved simultaneously in wastewater with low organic loads. The reduction in the cosubstrates concentration was directly influenced by the number of denitrifying bacteria (2.2x10 13 to 1.0x10 8 MPN/gTVS), and consequently, LAS degradation (60.1 to 55.4%). The sediment microorganisms in the Tietê river can be used as an alternative inoculum in the treat ment of wastewater with nitrate and LAS contamination. 2015 artículo científico 0034-7744 https://www.redalyc.org/articulo.oa?id=44933764024 en http://www.redalyc.org/revista.oa?id=449 Revista de Biología Tropical application/pdf Universidad de Costa Rica Revista de Biología Tropical (Costa Rica) Num.1 Vol.63 |
| format | Artículo científico |
| id | redalyc_44933764024 |
| institution | Redalyc |
| language | en |
| publishDate | 2015 |
| publisher | Universidad de Costa Rica |
| spellingShingle | Anaerobic degradation of anionic surfactants by indigenous microorganisms from sediments of a tropical polluted river in Brazil Iolanda Cristina Silveira Duarte Biología nitrate bacteria Anaerobic surfactant degradation Anaerobic degradation of anionic surfactants by indigenous microorganisms from sediments of a tropical polluted river in Brazil Iolanda Cristina Silveira Duarte Paula de França Dagoberto Yukio Okada Pierre Ferreira do Prado Maria Bernadete Amancio Varesche Biología nitrate bacteria Anaerobic surfactant degradation Linear alkylbenzene sulfonate (LAS) is widely used in the formulation of domestic and indus trial cleaning products, the most synthetic surfactants used worldwide. These products can reach water bodies through the discharge of untreated sewage or noneffective treatments. This study evaluates the ability of the microorganisms found in the Tietê river sediment to degrade this synthetic surfactant. The experiment was conducted in a bioreactor, operated in batch sequences under denitrifying conditions, with cycles of 24 hours and stirring at 150rpm, using 430mL of sediments and 1 070mL of a synthetic substrate consisting of yeast extract, soluble starch, sodium bicarbonate and sucrose. LAS was added at different concentrations of 15mg/L and 30mg/L. The reactor operation was divided into the biomass adaptation to the synthetic substrate without LAS and three experimental conditions: a) addition of 15mg/L of LAS; b) 50% reduction the cosubstrate concentration and 15mg/L of LAS, and c) addition of 30mg/L of LAS and 100% cosubstrate concentration. The results showed that the degradation efficiency of LAS was directly related to the addition of cosubstrates and the population of denitrifying bacteria. The removal of LAS and nitrate can be achieved simultaneously in wastewater with low organic loads. The reduction in the cosubstrates concentration was directly influenced by the number of denitrifying bacteria (2.2x10 13 to 1.0x10 8 MPN/gTVS), and consequently, LAS degradation (60.1 to 55.4%). The sediment microorganisms in the Tietê river can be used as an alternative inoculum in the treat ment of wastewater with nitrate and LAS contamination. 2015 artículo científico 0034-7744 https://www.redalyc.org/articulo.oa?id=44933764024 en http://www.redalyc.org/revista.oa?id=449 Revista de Biología Tropical application/pdf Universidad de Costa Rica Revista de Biología Tropical (Costa Rica) Num.1 Vol.63 |
| title | Anaerobic degradation of anionic surfactants by indigenous microorganisms from sediments of a tropical polluted river in Brazil |
| topic | Biología nitrate bacteria Anaerobic surfactant degradation |
| url | https://www.redalyc.org/articulo.oa?id=44933764024 |