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The dumping of dyes into bodies of water represents an environmental and health problem due to its toxicity. A solution to this problem could be the application of mycorremediation. So, in this work Aspergillus niger CDBB-H-175l was investigated in the discoloration (DC) of vat blue dye. A combination of statistical methodologies was applied to optimize DC; initiating with a 24-1 fractional factorial design (FFD), to evaluate; dye concentration, exposure time, pH and agitation. Results showed a minimum and maximum DC of 15% and 43%, respectively. By using a first-order model DC increased further to 63%. Additional experiments enhanced DC to 90% in step 7 of a steepest ascent  design, and this was improved to 94% at a higher concentration of 521 mg/L with the application of surface response methodology. Of the 63% total DC determined in the first-order model, 28% was attributed to the glucose oxidase activity (16.5 U/mL) and the H2O2 produced by A. niger, and 72% due to physisorption to the cell wall.  This is the first report where H2O2 produced by Aspergillus niger is implicated in dye decoloration.

THE CONTRIBUTION OF H2O2 PRODUCED BY ASPERGILLUS NIGER IN VAT BLUE DYE DISCOLORATION: ENHANCEMENT BY A STATISTICAL OPTIMIZATION METHODOLOGY