[Removal of Cd from Soil by Aspergillus fumigatus in a Semi-solid Culture].

[Removal of Cd from Soil by Aspergillus fumigatus in a Semi-solid Culture].

Huan Jing Ke Xue. 2017 Oct 08;38(10):4398-4404

Authors: Chen YN, Wang YN, Li YP, Li H, Chen YR, Wu YX, Gou Y, Zhu FZ, Zhang DL, Liu Y, Zeng GM

Abstract
A method was proposed to remove Cd from contaminated soils by a semi-solid culture containing Aspergillus fumigatus that have a strong resistance to Cd. The removal efficiencies of Cd in different simulated Cd pollution levels were studied and the changes in Cd adsorption and the enrichment in Aspergillus fumigatus were measured. The results showed that Aspergillus fumigatus could remove some Cd from the soil in the semi-solid culture system. When the concentration of Cd was 10 mg·kg-1, the total removal rate of Cd was up to 31%. Meanwhile, the dry weight of Aspergillus fumigatus and the pH of the system were studied during the culture process. The results showed that the dry weight decreased with the increase in culture time and Cd concentration, the maximum decrease rate of dry weight was 64%. The removal efficiency was the best when the pH was varied from 5.6 to 6.0. The changes in different extraction fractions for Cd showed that the main fractions of Cd removed by Aspergillus fumigatus were the acid-soluble fraction and the reducible fraction and the oxidizable fraction of Cd remained essentially unchanged before and after the culturing. The proposed method would provide valuable information for the remediation of heavy metal-contaminated soil by fungi.

PMID: 29965226 [PubMed – in process]

Source: Industry