Debaryomyces hansenii F39A as biosorbent for textile dyes removal

RUSCASSO FLORENCIA; BEZUS BRENDA; ACOSTA MARINA; GARMENDIA GABRIELA; VERO SILVANA; CURUTCHET GUSTAVO; CAVELLO IVANA; CAVALITTO SEBASTIÁN

Obregón

Simposio; Sixth International Symposium on Environmental Biotechnology and Engineering; 2019

Many industries, such as textile, paper and plastics, use dyes in order to color their products and consume substantial volumes of water. As a result, they generate a considerable amount of colored wastewater. Dyes are recalcitrant organic molecules, resistant to aerobic digestion, and are stable to light, heat and oxidizing agents. Yeasts have been successfully employed in textile dye treatment through biosorption mechanisms.The main objective of this research was to examine the biosorptive capacity of the Antarctic yeast Debaryomyces hansenii F39A biomass for a series of commercially available dyes. Reactive Blue 19 and Reactive Red 141 were chosen due they represent different dyes groupings including double azo class, anthraquinone and reactive class. Variables including pH, dye concentration, amount of adsorbent and contact time were studied. The equilibrium sorption capacity of the biomass increased with increasing initial dye concentration up to 350 mg l-1. Experimental isotherms fit the Langmuir model and the maximum uptake capacity (qmax) for the selected dyes was in the range 106-120 mg g-1 biomass. At initial dye concentration of 100 mg l-1, 2 g l-1 biomass loading and 20 ± 1ºC, D. hansenii F39A adsorbed around of 90 % of Reactive Red 141 and 50 % of Reactive Blue 19 at pH 6.0. When biomass loading was increased (6 gl-1), the uptake reached up to 90 % for Reactive Blue 19. Dye uptake process followed the pseudo-second-order kinetics for each dye-system studied. It may be concluded that a biosorption process could be adopted as a cost effective and efficient approach for decolorization of effluents and it may be an alternative to others costly materials such as activated carbon. Yeasts undoubtedly have the potential to efficiently and effectively remove dyes.