Abstract
The microbial reduction of Cr(VI) to Cr(III) is widely applied, but most studies ignored the stability of reduction products. In this study, the Cr(VI)-reducing bacterium of Sporosarcina saromensis combined with microbially induced carbonate precipitation (MICP) was used to explore the reduction and mineralization mechanisms of Cr(VI). The results indicated that the high concentration of Ca2+ could significantly enhance the reduction and mineralization of Cr(VI). The highest reduction and mineralization efficiencies of 99.5% and 55.9% were achieved at 4 g/L Ca2+. Moreover, the urease activity of S. saromensis in the experimental group was up to 13.28 U/mg NH3-N. Besides, the characteristic results revealed that Cr(VI) and reduced Cr(III) were absorbed on the surface or got into the interspace of CaCO3, which produced a new stable phase (Ca10Cr6O24(CO3)). Overall, the combination of S. saromensis and MICP technology might be a high-efficiency and environmentally friendly strategy for further application in the Cr(VI)-containing groundwater.
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Funding
This work was financially supported by the National Natural Science Foundation of China (52270172, 51909281) and the Key Research and Development International Cooperation Project (2022YFE0119600).
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Chunyangzi Jiang conducted the experiments, analyzed the data, and produced the data displays and original manuscript preparation. Ni He improved the manuscript. Yayuan Liu processed the data. Liang Hu conceived original ideas, supervision, funding acquisition, and reviewed and edited the manuscript. Hongbo Zhao contributed to funding acquisition. All the authors read and approved the manuscript.
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Jiang, C., Hu, L., He, N. et al. Bioreduction and mineralization of Cr(VI) by Sporosarcina saromensis W5 induced carbonate precipitation. Environ Sci Pollut Res 30, 89355–89368 (2023). https://doi.org/10.1007/s11356-023-28536-3
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DOI: https://doi.org/10.1007/s11356-023-28536-3