Biodegradação do petróleo por células bacterianas imobilizadas em esferas de amido de milho e alginato
DOI:
https://doi.org/10.33448/rsd-v10i17.24706Palavras-chave:
Biodegradação; Imobilização de célula; Matriz polimérica; Hidrocarbonetos.Resumo
As células imobilizadas apresentam vantagens na remoção de hidrocarbonetos do petróleo, quando comparadas ao uso de células livres. Este trabalho teve como objetivo avaliar o potencial de degradação de hidrocarbonetos por bactérias imobilizadas em matrizes de suporte compostas de alginato de potássio comercial e amido de milho. A matriz polimérica imobilizadora foi desenvolvida com alginato dental 2% e amido de milho 0,5% e 1%. As matrizes apresentam macroporos internamente, boa capacidade de imobilizar células, aumento da respiração basal (F2 e F3: 4 mg / l CO2 60 dias), biomassa bacteriana (F1: 1,5 x 106 UFC / g 60 dias) e remoção de n-alcanos e HPAs do sedimento, quando comparados às células livres (0 mg / l CO2; 0,3 x 106 UFC / g 60 dias). Os hidrocarbonetos aromáticos benzo (a) antraceno e antraceno não foram degradados. Naftaleno e dibenzo (a) antraceno atingiram taxas de degradação de 60% e 80%, respectivamente. Portanto, o consórcio testado e a matriz polimérica desenvolvida são promissores para uso na biorremediação de ambientes contaminados por hidrocarbonetos.
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Copyright (c) 2021 Carla Jaqueline Silva Sampaio; José Roberto Bispo de Souza; Gilson Correia de Carvalho; Cristina Maria Quintella; Milton Ricardo de Abreu Roque
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