Inhibition of cadmium releasing from sulfide tailings into the environment by carbonate-mineralized bacteria

TY - JOUR

T1 - Inhibition of cadmium releasing from sulfide tailings into the environment by carbonate-mineralized bacteria

AU - Yin, Tingting

AU - Lin, Hai

AU - Dong, Yingbo

AU - Wei, Zongsu

AU - Li, Bing

AU - Liu, Chenjing

AU - Chen, Xi

N1 - Publisher Copyright: © 2021 Elsevier B.V.

PY - 2021/10

Y1 - 2021/10

N2 - Microbially induced carbonate precipitation (MICP) could be a potential green solution to resolve the issue of heavy metal releasing from the sulfide tailings. However, detailed mechanism of heavy metal-biomineralization in sulfide tailings and impact of procedure parameters on in-situ applications remain unexplored. We systematically investigated the biomineralization process in the column tests for a better understanding of the mechanism and effects on the inhibition of cadmium (Cd) releasing from sulfide tailings. Results revealed that uniform and efficient mineralization in the tailings column occurred under bacterial concentration of 1 × 108 cfu mL−1, bacterial retention time of 3 h, concentration of mineralization solution of 0.25 mol L−1, and flow rate of 1.5 mL min−1. The leachable Cd concentration decreased 80.7% after 7 mineralization cycles. From a suit of characterizations, bacteria can adhere on the tailings and acted as the nucleation sites to induce the mineralization of Ca and Cd (to (Ca0.67, Cd0.33)CO3 and calcite phase); eventually, tailings particles were coated with the growth of mineralized carbonates, resulting in a reduction of exposure for tailings (especially sulfur). And thus, Cd release was inhibited. Results from this study will provide a fundamental basis for future in-situ applications of MICP to mitigate heavy metal pollutions.

AB - Microbially induced carbonate precipitation (MICP) could be a potential green solution to resolve the issue of heavy metal releasing from the sulfide tailings. However, detailed mechanism of heavy metal-biomineralization in sulfide tailings and impact of procedure parameters on in-situ applications remain unexplored. We systematically investigated the biomineralization process in the column tests for a better understanding of the mechanism and effects on the inhibition of cadmium (Cd) releasing from sulfide tailings. Results revealed that uniform and efficient mineralization in the tailings column occurred under bacterial concentration of 1 × 108 cfu mL−1, bacterial retention time of 3 h, concentration of mineralization solution of 0.25 mol L−1, and flow rate of 1.5 mL min−1. The leachable Cd concentration decreased 80.7% after 7 mineralization cycles. From a suit of characterizations, bacteria can adhere on the tailings and acted as the nucleation sites to induce the mineralization of Ca and Cd (to (Ca0.67, Cd0.33)CO3 and calcite phase); eventually, tailings particles were coated with the growth of mineralized carbonates, resulting in a reduction of exposure for tailings (especially sulfur). And thus, Cd release was inhibited. Results from this study will provide a fundamental basis for future in-situ applications of MICP to mitigate heavy metal pollutions.

KW - Biomineralization

KW - Cadmium (Cd)

KW - Microbially induced carbonate precipitation (MICP)

KW - Mine tailings

KW - Precipitation

UR - http://www.scopus.com/inward/record.url?scp=85109201887&partnerID=8YFLogxK

U2 - 10.1016/j.jhazmat.2021.126479

DO - 10.1016/j.jhazmat.2021.126479

M3 - Journal article

C2 - 34216966

AN - SCOPUS:85109201887

SN - 0304-3894

VL - 419

JO - Journal of Hazardous Materials

JF - Journal of Hazardous Materials

M1 - 126479

ER -