Biological removing of Cadmium from contaminated media by fungal biomass of Trichoderma species

Abstract

BackgroundEnvironment pollution by heavy metals is a global disaster and there are several cleaning methods including bioremediation. Trichoderma species inhibit the growth of pathogenic fungi and play a useful role in agriculture and ecosystem management.MethodsIn this study, the removing of cadmium ions by three species of Trichoderma (T. asperellum, T. harzianum and T. tomentosum) were studied under different pH (5, 7, 9) and different concentrations of Cd (1, 100, 200 ppm) in liquid media containing potato extract and dextrose. Above mentioned fungal strains were cultured in the Cd-polluted media and the remaining amount of metal ions in the media was measured after two months growth, using atomic absorption.ResultsResults showed that all three fungal species were able to reduce the amount of Cd in the all three pH of the medias; but their removal ability varies depending on the species and cultural conditions. T. asperellum was showed maximum removal efficiency of cadmium (76.17%), (10.75 mg/g, at fungal dry weight). Based on our results, the most removal efficiency of Cd ions for the fungal species was evaluated in the alkaline pH.ConclusionsTrichoderma species are important fungi in decreasing of Cadmium ions. They have bioremediation potency under various pH and concentration conditions.

Biosorption of cadmium from aqueous solutions by Trichoderma fungus: kinetic, thermodynamic, and equilibrium study

“…This also results in higher metal uptake [48]. Similar findings have been reported by Das and Guha [49], for chromium (III) removal by biomass of Termitomyces clypeatus, and Rathinam et al [50,51].…”

Use of natural bio-sorbent in removing dye, heavy metal and antibiotic-resistant bacteria from industrial wastewater

“…The industrial effluents are enriched media to grow and spread microbial population, which are resistant to different metals (Khadivinia et al 2014). The identification of bacteria resistance against different metals may provide a useful tool for the simultaneous monitoring of several toxic pollutants in the environment (Mohsenzadeh and Shahrokhi 2014). But heavy metal-resistant pathogenic bacteria may also confer health and environmental risk as metal resistance is often associated with antibiotic resistance.…”

The Lead [Pb(II)] tolerance and uptake ability of four fungal species, two from the genus Penicillium and two from the genus Talaromyces were investigated in this study. The species were isolated from a polluted tributary and identified to be closest to P. canescens, P. simplicissimum, T. macrosporus and another Talaromyces sp. via PCR targeting their internal transcribed spacer 1 and 4 sequences. All isolates have tolerances for up to 2000 µg/mL and 3000 µg/mL Pb(II) on solid and liquid medium, respective

“…The impact of initial Pb(II) concentration on the uptake potential of the fungal species was tested using a modified liquid culture set-up based on Mohsenzadeh and Shahrokhi, (2014). Flasks containing 50 mL of the Potato Dextrose Broth (PDB) were supplemented with Pb(II) with final concentrations of 500, 1000, 2000, and 3000 µg/mL and 100 µg/mL of tetracycline adjusted with Na-P buffer at 6 pH.…”