Decolorization and removal of toxicity of textile azo dyes using fungal biomass pelletized

Abstract

Industrialization and other human impacts have placed increasing pressure on aquatic environments, with the generation of large quantities of toxic aqueous effluents containing different substances, such as synthetic dyes and other organic pollutants. It is estimated that between 10 and 15% of all dyes used in textile processes and other industries are discharged into wastewater, causing extensive aquatic pollution. Biological methods have been employed for the removal of color and toxicity from effluents containing azo dyes. Therefore, biosorption tests were performed with the dyes Acid Blue 161 e Procion Red MX-5B in simple and binary solutions, whereas biodegradation treatment was performed with the dyes only in binary solution. For biosorption, the dyes were removed by the fungi Aspergillus niger, Aspergillus terreus and Rhizopus oligosporus. The fungal biomass demonstrated good adsorption capacity to these compounds. The elimination of the toxicity of the solution after biosorption demonstrated the effectiveness of the treatment. Intense molecular changes after biodegradation treatment with the A. terreus fungus were demonstrated by the FTIR analysis. However, toxicity tests with Lactuca sativa seeds and Artemia salina nauplii indicated the presence of highly toxic metabolites in the reaction medium at the end of the treatment. Based on the findings, biosorption is more suitable for this type of treatment, since it was also capable of removing the molecules from the medium, with the advantage of impeding the formation of highly toxic by-products.

Decolorization and Detoxification of Triphenylmethane Dyes by isolated endophytic fungus, Bjerkandera adusta SWUSI4 under non-nutritive conditions

“…declined with increasing initial dye concentrations. The implications of high initial dye concentrations agreed to most investigations (Chen and Ting 2015a, b;Wang et al 2017;Almeida and Corso 2018), thus suggesting as the toxicity of dye could be more pronounced at higher dye concentrations which may suppress the microbial growth. In order to improve the decolorization ability, 50mg L -1 TPM dyes solution was chosen as the optimum dye concentration.…”

“…3A). The bene t of using more biomass has also been reported in other studies Kaushik and Malik et al (2009); Wang et al (2017); Bankole et al (2018); Almeida and Corso (2018). The increase in dye sorption relative to adsorbent dose is attributed to an upsurge in the fungal surface area, which leads to more binding sites for dye molecules and provides more substances responsible for biodegradation such as enzymes.…”

“…It should be noted that even though many studies using fungal decolorization have been reported, exploring new fungal sources is still important due to the diversity of the dye and complexity of the environment (Yang et al 2009;Sodaneath et al 2017). To the best of our knowledge, many previous studies have focused on using fungi to decolourise synthetic dyes (such as azo, anthraquinone and triphenylmethane) especially white-rot fungi, which were from dye-contaminated environments such as sewage, soils (Yang et al 2009;Almeida and Corso 2018). However, the use of endophytic isolates for the decolourisation TPM dyes less to be explored.…”

Highly efficient biodegradation of reactive blue 19 under the activation of tea residue by a newly screened mixed bacterial flora DDMY2

“…6,7 At present, a vast literature on biological treatments using bacteria, fungi and algae have been reported to efficiently decolorize azo dyes. [8][9][10] Unfortunately, the study on biodecolorization of anthraquinone dyes is still insufficient and the effect is undesirable. For instance, Holkar et al 11 isolated a strain of Escherichia sp.…”

Decolorization and detoxification of triphenylmethane dyes by isolated endophytic fungus, Bjerkandera adusta SWUSI4 under non-nutritive conditions

“…To the best of our knowledge, many previous studies have focused on using fungi (especially white-rot fungi) to decolorize dyes (Yang et al 2009;Almeida and Corso 2018). However, the use of endophytic isolates for the decolorization of TPM dyes has been less explored.…”