Reducing COD Level on Oily Effluent by Utilizing Biosurfactant-Producing Bacteria

Ano: 2009 | Volume: 52 | Número: 4

Autores: Daniela Franco Carvalho Jacobucci, Maria Raquel de Godoy Oriani, Lucia Regina Durrant

Palavras-chave: biosurfactants, bactéria, cod, oily effluent, bioremediation

Resumo Português:

Duas bactérias isoladas de solo contaminado com
derivados de petróleo, Pantoea agglomerans e
Planococcus citreus, produzem biosurfactantes
utilizando respectivamente 1.5% de querosene e
óleo de oliva como únicas fontes de carbono. As
bactérias e os biosurfactantes produzidos foram
adicionados a um efluente oleoso obtido de uma
indústria nacional de sabão e margarina. As
atividades de emulsificação foram determinadas
pelo aumento da absorbância das emulsões óleo em
água a 610 nm, enquanto que as emulsões do tipo
água em óleo foram expressas em centímetros, pela
altura do halo de espumas formado. A redução da
demanda química de oxigênio (COD) mostra que as
linhagens e os biosurfactantes produzidos podem ser
utilizados em processos de biorremediação.

Resumo Inglês:

Two bacteria isolated from crude oil contaminated soil, Pantoea agglomerans and Planococcus citreus, produced
biosurfactants utilizing 1.5% of kerosene and olive oil as the sole carbon sources, respectively. The bacteria and the
biosurfactants produced were introduced to oily effluent, arising from margarine and soap industry. Emulsification
activities were determined by increases in the absorbance of the oil-in-water emulsions at 610 nm, whereas the
water-in-oil emulsions were expressed as the height (cm) of the emulsion layers formed. The 72 h incubation
experiment resulted in a COD (Chemical Oxygen Demand) reduction of 76% with Planococcus citreus strain and
70% with Pantoea agglomerans.The COD reduction with bacterial biosurfactants was over 50% in 24 h of
incubation. The COD reduction showed that these strains and the surfactants produced could be used in
bioremediation processes.