Changes in the microbial community during bioremediation of gasoline-contaminated soil

Show simple item record Leal, Aline Jaime Rodrigues, Edmo Montes Leal, Patrícia Lopes Júlio, Aline Daniela Lopes Fernandes, Rita de Cássia Rocha Borges, Arnaldo Chaer Tótola, Marcos Rogério 2017-10-26T16:02:35Z 2017-10-26T16:02:35Z 2016-12-19
dc.identifier.issn 15178382
dc.description.abstract We aimed to verify the changes in the microbial community during bioremediation of gasoline-contaminated soil. Microbial inoculants were produced from successive additions of gasoline to municipal solid waste compost (MSWC) previously fertilized with nitrogen-phosphorous. To obtain Inoculant A, fertilized MSWC was amended with gasoline every 3 days during 18 days. Inoculant B received the same application, but at every 6 days. Inoculant C included MSWC fertilized with N–P, but no gasoline. The inoculants were applied to gasoline-contaminated soil at 10, 30, or 50 g/kg. Mineralization of gasoline hydrocarbons in soil was evaluated by respirometric analysis. The viability of the inoculants was evaluated after 103 days of storage under refrigeration or room temperature. The relative proportions of microbial groups in the inoculants and soil were evaluated by FAME. The dose of 50 g/kg of inoculants A and B led to the largest CO2 emission from soil. CO2 emissions in treatments with inoculant C were inversely proportional to the dose of inoculant. Heterotrophic bacterial counts were greater in soil treated with inoculants A and B. The application of inoculants decreased the proportion of actinobacteria and increased of Gram-negative bacteria. Decline in the density of heterotrophic bacteria in inoculants occurred after storage. This reduction was bigger in inoculants stored at room temperature. The application of stored inoculants in gasoline-contaminated soil resulted in a CO2 emission twice bigger than that observed in uninoculated soil. We concluded that MSWC is an effective material for the production of microbial inoculants for the bioremediation of gasoline-contaminated soil. en
dc.format pdf pt-BR
dc.language.iso eng pt-BR
dc.publisher Brazilian Journal of Microbiology pt-BR
dc.relation.ispartofseries Volume 48, Issue 2, Pages 342-351, April–June 2017 pt-BR
dc.rights Open Access pt-BR
dc.subject Bioremediation pt-BR
dc.subject Gasoline degradation pt-BR
dc.subject Soil contamination pt-BR
dc.subject Microbial inoculants pt-BR
dc.subject Inoculant storage pt-BR
dc.title Changes in the microbial community during bioremediation of gasoline-contaminated soil en
dc.type Artigo pt-BR

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