Journal
BIOCHEMICAL ENGINEERING JOURNAL
Volume 166, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.bej.2020.107856
Keywords
Microbial mineralization; Heavy metals; Carbonate precipitation
Funding
- National Natural Science Foundation of China [52078317, 51708377]
- Natural Science Foundation of Jiangsu Province [BK20170339]
- Natural Science Foundation of The Jiangsu Higher Education Institutions of China [17KJB560008]
- National Engineering Laboratory of Highway Maintenance Technology (Changsha University of Science Technology) [kfj180105]
- Jiangsu Provincial Department of Housing, Urban-Rural Development [2020ZD05, 2017ZD002]
- Bureau of Housing and Urban-Rural Development of Suzhou [2019-14, 2020-15]
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The bioremediation using S. pasteurii was effective in reducing heavy metal leaching concentrations in contaminated soils, with a significant reduction in soluble-exchangeable Pb, Zn, and Cd levels. Additionally, the urease hydrolyzing bacteria helped accelerate metal precipitation by increasing pH. The primary goal of metal stabilization was achieved through immobilizing Pb, Zn, and Cd in carbonate precipitates driven by urease, leading to reduced metal toxicity in the treated soil.
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 to remediate soils contaminated with lead (Pb), zinc (Zn) and cadmium (Cd). A significant reduction of heavy metal leaching concentrations was observed in S. pasteurii bio-treated samples. Furthermore, urease hydrolyzing bacteria have additional advantages of accelerating metal precipitation by increasing pH. The soluble-exchangeable Pb, Zn and Cd was reduced by 33.3 % similar to 85.9 %, 21.4 % similar to 66.0 %, 13.6 % similar to 29.9 % respectively after bioremediation. The primary objective of metal stabilization was achieved by reducing the bioavailability through immobilizing the Pb, Zn and Cd in the urease-driven carbonate precipitation. Luminescent bacteria toxicity experiments revealed that the metal toxicity of contaminated soil was reduced after bioremediation using S. pasteurii. When subjected to severe environmental conditions, S. pasteurii bioremediation was superior to chemical precipitation technology in terms of long-term stability.
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