Abstract

SHIMIZU, Ernesto; VELEZ RUEDA, Jorge O.; ZAPATA, Pedro D.  and  VILLALBA, Laura L.. Dye degradation and residual lignin oxidation relationship caused by Ganoderma applanatum and Pycnoporus sanguineus in kraft black liquor. Rev. cienc. tecnol. [online]. 2009, n.12, pp.46-51. ISSN 1851-7587.

Kraft pulping for paper production has a significant impact on the environment with the generation of highly colored and toxic effluents. Because white rot fungi (WRF) have a distinctive capacity for efficiently degrading wood lignin by the extracellular enzymes action, they are considered as a growing alternative in biotechnology. The growing and degrading ability of two WRF, Ganoderma applanatum and Pycnoporus sanguineus from Misiones (Argentina) in dyes and kraft black liquor was analyzed as a prospective application on bioremediation processes. Black liquor is a kraft pulping process effluent containing solubilized lignin, the primary organic by-product from the chemical digestion of lignocellulosic raw materials. Dye decolorization experiments (solid culture) and black liquor degrading studies (solid and liquid cultures) were conducted. Decolorization experiments in solid culture were conducted with bromophenol blue, malacchite green and black liquor at acid and alkaline pH. Liquid culture studies were quantified by uV spectrometric measurements. Residual lignin degradation was confirmed as a result of the change in absorbance by spectral scanning over the wavelength range from 200 to 400 nm Decolorization and degrading experiments validated the dye and lignin degrading ability of both fungi in solid and liquid cultures.

Keywords : Dye decolorization; White rot fungi; Lignin; Degradation.

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