C. Martin et P. Manzanares, A STUDY OF THE DECOLOURIZATION OF STRAW SODA-PULPING EFFLUENTS BY TRAMETES-VERSICOLOR, Bioresource technology, 47(3), 1994, pp. 209-214
Citations number
15
Categorie Soggetti
Energy & Fuels","Biothechnology & Applied Migrobiology",Agriculture
The decolourization of straw alkaline-pulping liquors by Trametes vers
icolor has been studied of the ligninolytic fungi screened, T. versico
lor was found to be the most effective microorganism for removing colo
ur from effluents. Fungal biomass immobilized on a plastic surface and
fungal pellets were used in flask decolourization assays. The influen
ce of agitation, temperature, type of support and organic and mineral
supplementation was evaluated Maximum decolourization was obtained for
immobilized biomass and effluents supplemented with 10 g/l of glucose
, where about 70% of the initial colour (measured as absorbance at 465
nm) was removed after 4 days. The addition of an inorganic nitrogen s
ource to the effluent reduced significantly the efficiency of decolour
ization. The possibility of reusing the immobilized biomass to decolou
rize effluents was examined in three successive cycles. The results sh
owed percentages of decolourization of almost 80% of the initial value
for every cycle. The decolourization process by T. versicolor, under
the assay conditions, was characterized by a considerable decrease in
the pH and an elevated adsorption of lignin-derived products on to the
biological matrix accumulated on the plastic support (measured as col
our and alkali-soluble lignin content).