Abstract
The behavior of biomineralization of bacteria A in the presence of Cd2+ and the effect of Cd2+ polluted soil repaired by bacteria A were investigated. The results show that while the bacteria A had a high urease constant Km of 1.231 mol/L and the Cd2+ concentration was 0.595 mg/L, the bacteria grew well. The growth of bacteria changed from accelerated to restrained with the increase of Cd2+ concentration. Bacteria A have high urease activity in Cd2+ polluted solution and soil. Free Cd2+ ions can react with CO3 2- induced by bacteria urease to form insoluble CdCO3 crystals. By pot experiment, the Cd2+ content in soil and Cd2+ concentration in wheat can be efficiently reduced after the polluted soil was recovered by bacteria A culture medium. The extensive prospect of applying bacteria A to soil and water remediation has been shown.