Adsorption Step in the Biological Degradation of a Textile Dye

Abstract

This research documents the removal of the dye Gris Lanaset G from aqueous solutions by fungal pellets. Adsorption of the dye by dead biomass pellets of Trametes versicolor was determined and compared with dye removal by enzymatic degradation. Six kinetic equations were fitted to the experimental adsorption data obtained. The results indicate that kinetics such as the Elovich equation, which considers that the rate-controlling step is the diffusion of the dye molecules, show the best fit. Nonlinear Langmuir and Freundlich equations were also fitted into the adsorption data, and it can be concluded that the adsorption equilibrium can be interpreted by the Langmuir isotherm. Adsorption plays an important role in the process of the elimination of color from textile wastewater, although not all of the elimination is due to this physical process when the microorganism is active. The removal of color (around 90%) with active microorganisms is greater than that obtained with the adsorption process.

Adsorption and biological decolourization of azo dye Reactive Red 2 in semicontinuous anaerobic reactors

“…Further, the UV-Vis spectra of the effluent also indicated that dye removal in the initial days was due to adsorption (UV-Vis absorbance spectra not shown). Similar observations have been made by Aretxaga et al [20] while conducting experiments with live and dead biomass pellets of Trametes versicolor. It was observed that adsorption played an important role and accounted for around 80% of colour elimination.…”

Removal of Arsenic Using Mesoporous Silicate Media Impregnated Metal Oxides Nano-Particles

“…Among five different kinetic models, two kinetic models such as the pseudo second order and parabolic diffusion kinetic models had very high determination coefficients (R 2 ). The pseudo second order kinetic model is usually related to the adsorption process that has the exchange reaction as the rate-controlling step (Aretxaga et al, 2001). Therefore, it was found that the exchange reaction in which arsenate adsorption for adsorbents resulted in OH -/H + release was the rate-controlling step for these kinetic studies.…”

Biosorption optimization and equilibrium isotherm of industrial dye compounds in novel strains of microscopic fungi

“…Biosorption is a physicochemical process involving many mechanisms, including absorption, adsorption, ion exchange, surface complexation and precipitation. Biosorption processes are highly important in the environment and conventional biotreatment processes (Ali 2010(Ali , 2012(Ali , 2014Ali et al 2012;Ali and Gupta 2007;Aretxage et al 2001;Fomina and Gadd 2014). In recent years, there has been an increasing interest in the ligninolytic capabilities of microfungi, which, similarly to the white-rot fungi, can remove a broad spectrum of aromatic compounds from wastewater.…”

“…However, decolorization with active biomass provides better results, most likely due to the parallel dye compound removal (Aretxage et al 2001). By using the growing cultures in dye removal, one can avoid the need for a separate biomass production process, including cultivation, harvesting, drying, processing and storage prior to use.…”

“…It also allows to grow the biomass and remove the dyes in the same step, leading to a simpler system control and lower operational costs (Aksu 2005;Xin et al 2010). Recently, biosorption was suggested as a first step, prior to microbial treatment, to concentrate the dye (Aretxage et al 2001;Nigam et al 2000). Biosorption by the biomass is the result of Van der Waals physical interactions and chemical properties of ionic and covalent bonds.…”