Agualimpia B, Otero JV, Zafra G

Language: English
References: 37
Page: 1221-1226
PDF size: 291.33 Kb.

ABSTRACT

The use of novel mixed microbial consortia composed of native yeast and bacteria was evaluated for the treatment of palm oil mill effluents (POME) from an oil refining process. For this purpose, 31 native yeast and bacteria isolates demonstrating the ability to remove fats, oils and greases were evaluated, either as single organisms or mixed inocula, for the treatment of POMEs. Molecular and biochemical characterizations revealed that isolates corresponded to Candida, Bacillus and Pseudomonas genera. Seven mixed inocula, containing the 6 most degrading isolates, were established and tested for the removal of palm oil in liquid culture, achieving 68 to 84 % removal after 48 h. The inoculum constituted by all of the isolates produced the best results with an overall COD reduction from 1840 to 260 mg/L (84 %), evidencing a synergic effect of the microorganisms. The use of the same inoculum for the treatment of a palm oil mill effluent led to a removal of 75 % organic matter and 72 % oil and grease after 48 h. Our results demonstrated the ability of these isolates to use palm oil as sole carbon source and effectively decrease the concentration of pollutants in palm oil mill effluents in a short period of time. The use of these microorganisms may provide adaptive advantages that could improve POME remediation processes, especially with mixtures of native bacteria and yeast able to degrade palm oil as sole carbon source.

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