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, Sonora

Congreso; The Sixth International Symposium on Environmental Biotechnology and Engineering (6ISEBE); 2018

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. Due to increasingly stringent restrictions on the organic content of industrial effluents, it is necessary to eliminate dyes from wastewater before it is discharged. Wastewater containing dyes is very difficult to treat, since the dyes are recalcitrant organic molecules, resistant to aerobic digestion, and are stable to light, heat and oxidizing agents. Recently, numerous approaches have been studied for the development of cheaper and effective adsorbents. In this context, yeasts have been successfully employed in textile dye treatment through biosorption mechanisms. Their success is largely based on their unicellular nature, along with high growth rates and the capability to grow into inexpensive growth media.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 300 mg/l for Reactive Red 141 and up to 350 mg/l for Reactive Blue 19, respectively. Experimental isotherms fit the Langmuir model and the maximum uptake capacity (Q0) for the selected dyes was in the range 110-125 mg/g biomass. At initial dye concentration of 100 mg/l, 2 g/l 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 g/l), 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 more costly materials such as activated carbon.