Journal of Bacteriology & Parasitology

Biosorption of heavy metals using Acidithiobacillus ferrooxidans and kinetic study

9^th Biotechnology Congress

August 31-September 02, 2015 Orlando,Florida, USA

Roya Mafigholami

Islamic Azad University, Iran

Posters-Accepted Abstracts: J Biotechnol Biomater

Abstract:

This study attempted to conduct a synthetic study on biological recovery of heavy metals from spent catalysts using Acidithiobacillus ferrooxidans. This bacterium produces sulfuric acid and helps recovering metals at the same time. It is easily adapted to growing concentrations of heavy metals under optimized conditions (temperature 30°C, Ph 1.9, pulp density 120 μm, rotation speed 160). This study measured Ph, Eh, cellular mass, ferrous and ferric iron concentrations during bioleaching and also bacterium-mediated bioleached content from the spent catalyst. The results revealed that the higher concentrations of spent catalysts could act as a reproduction inhibitor and as a result lower the growth rate of the bacterium. For example, at 200 g/L, bacterium�??s cell division occurred once in 8 days and the kinetics of growth was 0.093 per day. Bacteria�??s population rose to 504�?107 from the initial 1�?107and then fell to 3.6�?107 following the death phase. Reaction rate of culture batch containing 200 mg/L Ni followed 2nd order rate (in the presence of Acidithiobacillus ferrooxidans) and the kinetics of reaction was the slope of the line (0.005). Also, reaction rate of culture batch containing 200 mg/L V followed 1st order rate (in the presence of Acidithiobacillus ferrooxidans) and the kinetics of reaction was the slope of the line (-0.086).

Biography :

Email: r.gholami@iauahvaz.ac.ir