Studies on treatment of textile dyes using yeast cultures

Abstract

Bioremediation is an invaluable tool box for wider application in newlinethe area of environmental protection One of the most ubiquitous biomass newlinetypes available for bioremediation of textile dyes at lower pH values is yeast newlineYeast is considered as an inexpensive and readily available biomass newlineFurthermore yeast cells retain their ability to accumulate a broad range of newlinetextile dyes in varying degrees under a wide range of external conditions newlineYeast has been known to be capable of rapid bioaccumulation of metal ions newlinefrom solution But little work has been carried out for the bioaccumulation of newlinetextile dyes present in waste water Compared to algae bacteria and newlinefilamentous fungi yeasts exhibit attractive characteristics Yeast cells are newlineeasily cultivated into growth media in a laboratory scale and are readily newlineavailable for bioaccumulation of contaminants from waste water at lower pH newlinevalues Algae require light substrate for its growth The biomass production newlineper unit time was found to be more in yeast culture when compared with fungi newlineand bacteria newlineIn the present work bioaccumulations and biosorption methods newlinewere employed for the removal of Reactive Red 11 RR11 and Acid Green1 newlineAG1 dyes using live and dead yeast cultures of Rhodotorula glutinis newlineR glutinis Pichia pastoris P pastoris and Leucosporidium antarticum newline L antarticum Process parameters for bioaccumulation such as inoculum newlinevolume initial pH and initial dye concentration were optimized newlineEnvironmental parameters such as sorbent dosage pH and initial dye newlineconcentration for biosorption studies were optimized Specific growth rate newlineduring the accumulation of textile dyes were determined Kinetic data were analyzed using pseudofirst order pseudosecond order and intraparticle newlinediffusion models Equilibrium data was analyzed with Langmuir and newlineFreundlich adsorption isotherm models for biosorption studies Functional newlinegroups present on surface of the biomass were characterized using FTIR newlineSurface morphology studies were carried out with SEM for the biomass newlineutilized for the bioaccumulation newline