Pazarlioglu et al. [13] also found
that biodegradation was the main mechanism of direct azo dye decolouration in living cultures of free and immobilised cultures of the white-rot fungus Phanerochaete chrysosporium. The dyes were not adsorbed onto K1 carriers. However, a considerable amount of dye was adsorbed onto SS and at the end of the 4th batch they were saturated in dye. Therefore, this approach would create the additional problem of the dyed-SS disposal. A possible solution for their disposal would be to use them for the production of laccase enzymes [18]. Another alternative would be to burn the dyed SS to generate power. It is worth mention that T. pubescens was able to decolourise the dye solutions without the addition of nutrients, buffer or redox mediators to learn more a significant extent. This indicates the high degrading ability of this fungus, which was also reported by other Selleckchem AZD4547 authors [1] and [4]. So in view of these encouraging results, studies on dye decolouration by this fungus under more realistic conditions will be pursued at my laboratory. Semi-solid-state cultures of the white-rot fungus T. pubescens have been shown to be very effective to decolourise textile metal-complex dyes in successive batches, even with neither nutrient addition nor pH adjustment.
The inert support K1 seemed more suitable for dye decolouration since the dye was not adsorbed onto it. In addition, the support integrity was maintained along fermentation allowing its recovery and re-utilisation. This would make the cost of the overall process more favourable. The utilisation
of lignocellulosic supports in dye decolouration by white-rot fungi could be advantageous in countries with a huge amount of lignocellulosic wastes. The author gratefully acknowledges Bixent del Barrio and AnoxKaldnes for providing the Kaldnes™ K1 carriers and Miguel Palat from CTH R. Beilich GmbH (Barcelona, Spain) for the gift of the dyes. “
“Polycyclic aromatic hydrocarbons (PAHs) are ubiquitous pollutants generated from various anthropogenic activities [20]. These compounds are grouped under hazardous aromatic compounds, having two or more fused benzene rings arranged in such a way [25] and insoluble in water [13] and persistence nature. These compounds have been identified as toxic, carcinogenic and some compounds demonstrated teratogenic effects [23]. The insoluble and persistence Branched chain aminotransferase nature of PAHs are the major limitations on the removal or remediation from the soil or aqueous media. The old as well as newer treatment technologies employed in the removal of contaminants are ineffective in the case of PAHs [32]. Though chemical oxidants able to cleave the fused rings and the formation of hydroxylated or oxygenated metabolites needs immediate attention. The only option available is the use of microorganisms. Among the microorganisms, some of the microbial species have the capacity to tolerate PAHs and some species even try to metabolize.