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Biosorption of copper by immobilized biomass of Aspergillus australensis . Effect of metal on the viability, cellular components, polyhydroxyalkanoates production, and oxidative stress
Environmental Science and Pollution Research ( IF 2.914 ) Pub Date : 2020-02-13 , DOI: 10.1007/s11356-020-07747-y
Ana Gabriela Contreras-Cortés, Francisco Javier Almendariz-Tapia, Mario Onofre Cortez-Rocha, Armando Burgos-Hernández, Ema Carina Rosas-Burgos, Francisco Rodríguez-Félix, Agustín Gómez-Álvarez, Manuel Ángel Quevedo-López, Maribel Plascencia-Jatomea

Abstract Heavy metals are toxic especially when they are introduced into the environment due to anthropogenic activities such as metallurgy, mining, and tanning. Removing these pollutants has become a worldwide concern since they cannot be degraded into nontoxic forms causing extended effects in the ecosystems. The use of an Aspergillus australensis was evaluated in order to remove Cu2+ from simulated wastewater. The fungus was isolated from river sludges contaminated with heavy metals and was first evaluated for the determination of Cu2+ tolerance levels. Microscopic fluorescence analysis was carried out to determine the effect of Cu2+ presence on the viability, cellular components, polyhydroxyalkanoates production, and oxidative stress of the fungus, as a response to the stress caused by exposure to metal. In order to achieve copper removal, the A. australensis biomass was produced using batch cultures, and the mycelium was immobilized on a textile media in order to compare the copper-removal efficiency of live or dead biomass. The optimal values of pH and temperature for biomass production were established by using a surface response analysis. Live immobilized biomass was capable of removing Cu2+ from 1.54 ± 0.19 to 2.66 ± 0.26 mg of copper/ g of dry biomass, while values of 1.93 ± 0.03 to 2.36 ± 0.29 mg of copper/g of dry biomass were observed when dead biomass was used. As was expected, copper removal using biomass varied depending on the pH and temperature used.
更新日期:2020-02-14

 

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