Study of P.aeroginosa Capable ofRemoving Zn(II) from Aqueous Solution

A great number of studies have been conducted for removal of heavy metals from aqueous solution by using biological absorbents which are considered to be the most appropriate than the physical and chemical methods. For this aim, first, the sediment samples of Imam Khomeini port (depths less than 3 m) were collected by Van Veen Grab. Then the P.aeroginosa bacterium was isolated and identified as the resistor to zinc. The study of the growth of P.aeroginosabacterium in the aqueous solution containing 20, 40, 80, 160, and 320 mg/L of zinc showed that the increase in zinc concentration caused the decrease in the bacterium growth. The maximum bacterium growth of 0.93 was obtained at 20 mg/L of zinc. With the increase in concentration of zinc to 320 mg/L, the bacterium growth decreased to 0.37 which showed the significant difference with the maximum bacterium growth in 20 mg/L concentration of zinc metal (p<0.05). Investigating the biosorption of zinc by P. aeroginosa bacterium in 25, 50, and 100 mg/L concentration showed that the bacterium absorbed more amounts of metal by incraseing the concentration of zinc in the environment. The P.aeroginosa is able to eliminate 86% of zinc in 25 mg/L concentration of zinc.