Application of a bacterial extracellular polymeric substance in heavy metal adsorption in a co-contaminated aqueous system
The application of a bacterial extracellular polymeric substance (EPS) in the bioremediation of heavy metals (Cd, Zn and Cu) by a microbial consortium in a hydrocarbon co-contaminated aqueous system was studied. At the low concentrations used in this work (1.00 ppm of each metal), it was not observed an inhibitory effect on the cellular growing. In the other hand, the application of the EPS lead to a lower concentration of the free heavy metals in solution, once a great part of them is adsorbed in the polymeric matrix (87.12% of Cd; 19.82% of Zn; and 37.64% of Cu), when compared to what is adsorbed or internalized by biomass (5.35% of Cd; 47.35% of Zn; and 24.93% of Cu). It was noted an increase of 24% in the consumption of ethylbenzene, among the gasoline components that were quantified, in the small interval of time evaluated (30 hours). Our results suggest that, if the experiments were conducted in a larger interval of time, it would possibly be noted a higher effect in the degradation of gasoline compounds. Still, considering the low concentrations that were evaluated, it is possible that a real system could be bioremediated by natural attenuation process, demonstrated by the low effect of those levels of contaminants and co-contaminants over the naturally present microbial consortium.
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Sociedade Brasileira de Microbiologia
2008
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oai:scielo:S1517-838220080004000342009-04-06Application of a bacterial extracellular polymeric substance in heavy metal adsorption in a co-contaminated aqueous systemMartins,Paula Salles de OliveiraAlmeida,Narcisa Furtado deLeite,Selma Gomes Ferreira EPS co-contamination heavy metals natural attenuation The application of a bacterial extracellular polymeric substance (EPS) in the bioremediation of heavy metals (Cd, Zn and Cu) by a microbial consortium in a hydrocarbon co-contaminated aqueous system was studied. At the low concentrations used in this work (1.00 ppm of each metal), it was not observed an inhibitory effect on the cellular growing. In the other hand, the application of the EPS lead to a lower concentration of the free heavy metals in solution, once a great part of them is adsorbed in the polymeric matrix (87.12% of Cd; 19.82% of Zn; and 37.64% of Cu), when compared to what is adsorbed or internalized by biomass (5.35% of Cd; 47.35% of Zn; and 24.93% of Cu). It was noted an increase of 24% in the consumption of ethylbenzene, among the gasoline components that were quantified, in the small interval of time evaluated (30 hours). Our results suggest that, if the experiments were conducted in a larger interval of time, it would possibly be noted a higher effect in the degradation of gasoline compounds. Still, considering the low concentrations that were evaluated, it is possible that a real system could be bioremediated by natural attenuation process, demonstrated by the low effect of those levels of contaminants and co-contaminants over the naturally present microbial consortium.info:eu-repo/semantics/openAccessSociedade Brasileira de MicrobiologiaBrazilian Journal of Microbiology v.39 n.4 20082008-12-01info:eu-repo/semantics/articletext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822008000400034en10.1590/S1517-83822008000400034 |
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Martins,Paula Salles de Oliveira Almeida,Narcisa Furtado de Leite,Selma Gomes Ferreira |
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Martins,Paula Salles de Oliveira Almeida,Narcisa Furtado de Leite,Selma Gomes Ferreira Application of a bacterial extracellular polymeric substance in heavy metal adsorption in a co-contaminated aqueous system |
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Martins,Paula Salles de Oliveira Almeida,Narcisa Furtado de Leite,Selma Gomes Ferreira |
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Martins,Paula Salles de Oliveira |
title |
Application of a bacterial extracellular polymeric substance in heavy metal adsorption in a co-contaminated aqueous system |
title_short |
Application of a bacterial extracellular polymeric substance in heavy metal adsorption in a co-contaminated aqueous system |
title_full |
Application of a bacterial extracellular polymeric substance in heavy metal adsorption in a co-contaminated aqueous system |
title_fullStr |
Application of a bacterial extracellular polymeric substance in heavy metal adsorption in a co-contaminated aqueous system |
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Application of a bacterial extracellular polymeric substance in heavy metal adsorption in a co-contaminated aqueous system |
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application of a bacterial extracellular polymeric substance in heavy metal adsorption in a co-contaminated aqueous system |
description |
The application of a bacterial extracellular polymeric substance (EPS) in the bioremediation of heavy metals (Cd, Zn and Cu) by a microbial consortium in a hydrocarbon co-contaminated aqueous system was studied. At the low concentrations used in this work (1.00 ppm of each metal), it was not observed an inhibitory effect on the cellular growing. In the other hand, the application of the EPS lead to a lower concentration of the free heavy metals in solution, once a great part of them is adsorbed in the polymeric matrix (87.12% of Cd; 19.82% of Zn; and 37.64% of Cu), when compared to what is adsorbed or internalized by biomass (5.35% of Cd; 47.35% of Zn; and 24.93% of Cu). It was noted an increase of 24% in the consumption of ethylbenzene, among the gasoline components that were quantified, in the small interval of time evaluated (30 hours). Our results suggest that, if the experiments were conducted in a larger interval of time, it would possibly be noted a higher effect in the degradation of gasoline compounds. Still, considering the low concentrations that were evaluated, it is possible that a real system could be bioremediated by natural attenuation process, demonstrated by the low effect of those levels of contaminants and co-contaminants over the naturally present microbial consortium. |
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Sociedade Brasileira de Microbiologia |
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2008 |
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http://old.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822008000400034 |
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