Decolorization of dye wastewaters by biosorbents: A review

Decoloración de aguas residuales de una industria de pinturas por la microalga Chlorella sp

“…This solution supplies both essential macro and micronutrients for a normal cell grow. To let microalgae grow 14 mL of the cultivated medium was placed inside a uso de la biotecnología como ciencia aplicada a los tratamientos de aguas residuales de este tipo (4,5), pues son amigables con el medio ambiente, producen pocos lodos y no son tan costosos (1). En este sentido, las microalgas son una buena opción para la bioremediación de aguas residuales coloreadas (6).…”

“…La capacidad de biosorción se atribuye a su relativa alta área superficial y su gran afinidad de enlace (8,9). Grupos funcionales tales como hidroxilos, carboxilatos, aminas y fosfatos que se encuentran en la superficie de la pared celular son considerados los responsables mediante atracción electrostática y complejación, de retirar los contaminantes de las aguas residuales (4,10). Al igual que las bacterias, las algas son capaces de degradar colorantes "azo" a través de la azoreductasa que inicia el rompimiento del enlace "azo", resultando en la formación de aminas aromáticas (1,(11)(12)(13).…”

“…Pigments removal in wastewater has been a very great challenge for a long time trying to find both a cheaper and effective treatment (4). Some of these substances can stand biodegradation or changes because they are xenobiotic compounds in nature; there are very versatile microorganisms with a typical or distinctive metabolic system, which let them biodegradation these compounds bringing out decoloration and mineralization of them; Due to this, in recent years biotechnology is being used as an applied science for wastewater treatment of this kind (4,5), because they are environment friendly, they produce lower sludges at a lower cost (1).…”

“…The capacity of biosortion is attributed to its high surface area and its great affinity for bond (8,9). Functional groups such as hydroxyls, carboxylates, amines and phosphates in the cell surface are considered as direct responsible by means of electrostatic attraction and complexation, to remove pollutants from wastewater (4,10). Alike bacterias, algaes can degrade colorants "azo" through azoreductase that starts breacking the "azo" bond, producing aromatic amines (1,(11)(12)(13).…”

Biodegradation of Synthetic Dyes: A Mycoremediation Approach for Degradation/Decolourization of Textile Dyes and Effluents

“…Wong et al [49] reported the adsorption of Acid green 27, Acid violet 7 and Indigo carmine dyes on living and dead mycelia of Trametes versicolor. Biosorption is a metabolically independent process which involves the binding of solutes to the fungal biomass and thus dye decolourization can occur by either living or dead fungal biomass [50]. The dead fungal biomass contains a natural polysachharide chitin and its derivative chitosan in their cell walls which has a unique molecular structure with a high affinity for many classes of dyes.…”