Bioremediation of metal-contaminated soils by microbially-induced carbonate precipitation and its effects on ecotoxicity and long-term stability

Bioremediation using microorganisms is a promising technique to remediate soil contaminated with heavy metals. In this study, Sporosarcina pasteurii (S. pasteurii) bioremediation by mixing method was used soils lead (Pb), zinc (Zn) and cadmium (Cd). A significant reduction of metal leaching concentrations observed in S. bio-treated samples. Furthermore, urease hydrolyzing bacteria have additional advantages accelerating precipitation increasing pH. The soluble-exchangeable Pb, Zn Cd reduced 33.3 % ? 85.9 %, 21.4 66.0 13.6 29.9 respectively after bioremediation. primary objective stabilization achieved reducing the bioavailability through immobilizing urease-driven carbonate precipitation. Luminescent toxicity experiments revealed that pasteurii. When subjected severe environmental conditions, superior chemical technology terms long-term stability.