Bioremoval of Ni and Cd in the presence of diethylketone by fungi and by bacteria – A comparative study. (May 2017)

• Record Type: Journal Article
• Authors: Costa, Filomena; Tavares, Teresa
• Is Part Of: International biodeterioration & biodegradation. Volume 120(2017)
• Page Start: 115
• Page End: 123
• Publication Date: 2017-05
• Subjects: Bacteria -- Cadmium -- Diethylketone -- Fungi -- Kinetics -- Nickel; Biodegradation -- Periodicals; Bioremediation -- Periodicals; Biodegradation -- Periodicals; Biodégradation -- Périodiques; Biorestauration -- Périodiques; Electronic journals; 620.11223
• DOI: 10.1016/j.ibiod.2017.02.018
• Languages: English
• ISSNs: 0964-8305

Abstract

Abstract: Two fungi ( Alternaria sp. and Penicillium sp.) and one gram-positive bacterium ( Streptococcus equisimilis ) were used to remove Ni and Cd from aqueous solutions in the presence of diethylketone. Individual toxicity assays were performed at an initial stage to evaluate the xenobiotic impact of the initial concentration of those metals on the growth of the microorganisms and allowed to infer that the growth of S. equisimilis is negatively affected by both metals, whereas the growth of both fungi is positively stimulated by the presence of Ni and inhibited by Cd (>40 mg/L). Within the group of microorganisms tested, S. equisimilis presented higher removal efficiency (%) and uptake. In a second stage, biosorption assays were performed using aqueous solutions containing Ni, Cd and diethylketone (mixed solutions) and aimed to infer about the overall effect of the initial metal concentrations on the growth and on the sorption capacity of the microorganisms, as well as to evaluate the interaction between the sorbent matrices. It was demonstrated that despite the mixed solution exert a negative effect on the removal process and on the growth of the three microbial cultures, the system is able to decontaminate aqueous solutions with high concentrations of Ni, Cd and diethylketone. Graphical abstract: Highlights: Ni and Cd in concentrations higher than 5 mg/L inhibit the growth of S. equisimilis. The growth of Alternaria sp. and Penicillium sp. is stimulated by Ni but not by Cd. Alternaria sp. achieves uptakes of 11.32 mg/g for Ni and 8.50 mg/g for Cd. Penicillium sp. reaches uptakes of 13.06 mg/g for Ni and 16.79 mg/g for Cd. S. equisimilis achieves uptakes of 55.65 mg/g for Ni and 20.37 mg/g for Cd.