Involvement of lignin peroxidase in the decolourization of black olive mill wastewaters by Geotrichum candidum

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AimDecolourization of black olive mill wastewaters (OMW) by depolymerization of phenolic compounds by Geotrichum candidum.Methods and ResultsOur results show that G. candidum is able to grow on black OMW supplemented with carbon source and nitrogen. The Geotrichum growth decreased the pH and induced a 49% of colour removal when the black OMW was supplemented with glycerol and diammonium tartrate (20 mM ammonium). An improvement of 10% of colour removal was observed when the culture was supplemented with veratryl alcohol. The decolourization was inhibited with glutamate as nitrogen source.ConclusionOur results suggest the potential use of G. candidum in black OMW decolourization and support the concept that lignin peroxidase (LiP) of G. candidum is involved in the depolymerization of phenolic compounds.Significance and Impact of the StudyThis is the first report of LiP production by G. candidum on OMW.

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