Uptake and removal of nickel by new bacterial strain (NRC-BT-1)

摘要

Nickel removal has been investigated by new 16 various bacterial strains isolated from Ramsar Warm Springs, Iran. Results showed that a strain of gram-negative cocobacilli bacteria is highly capable to take up nickel in optimum pH about 6. The Ni~+ initial concentrations of 20-200 ppm have been studied. Uptake capacity of bacterial biomass regarding concentrations below 150 ppm is nearly constant; it is decreased from 150 to 200 ppm and at 200 ppm, is not any nickel taken up by bacterial biomass. After 60 min of contact time, nickel uptake reaches maximum by 53%. Ni~+ sorption mechanism was demonstrated mainly as bioaccumulation and biosorption was very limited. The presence of the other cations such as Zn~(2+), Cu~(2+) and Pb~(2+) did not affect Ni~+ uptake. Nickel taken up by biomass can be easily recovered by HNO_3 (0.1 M).