Removal of some reactive dyes by untreated and pretreated <i>Saccharomyces cerevisiae, </i>an alcohol fermentation waste

Abstract

This study presents <i>Saccharomyces cerevisiae</i>, an alcohol fermentation waste, for removal of acidic dyes (Red 3:1 & Orange 13) even after chemical and physical modification. Biosorption performance was found 96.29% through untreated biomass and 97.31% through pretreated biomass with hydrogen peroxide solution for Red 3:1, whereas 93.49% through untreated biomass and 94.71% through pretreated biomass with dimethyl sulfoxide and phosphoric acid solution for Orange 13. Good results were obtained when modified biomass was used to treat dye wastewater. FTIR analyses, before and after treatment, suggest that increase in dye adsorption was due to hydrolysis of yeast. Besides, Freundlich and Langmuir adsorption models were found suitable for biosorptions of both dyestuffs.