Significance of autochthonous Bacillus sp. KK1 on biomineralization of lead in mine tailings

Microbially-induced Carbonate Precipitation for Immobilization of Toxic Metals

“…A high removal rate (68%) of Pb was observed within 48 h based on MICP resulting in lead carbonate precipitates of diameter ~5 µm. The MICP 23 process also resulted in a significant increase in enzyme activities (phosphatase 37%, dehydrogenase 14%, and urease 334%) in the treated mine tailings (Govarthanan et al, 2013). Increased urease and dehydrogenase activity in Pb-contaminated soils after adding ureolytic bacteria has also been reported by others (Achal et al, 2012c).…”

“…At the same time, the carbonate Pb fraction increased by 38% due to bacterially-mediated precipitation of Pb (see Figure 4b). XRD spectra showed differences in PbO and Pb(OH)2 in bioaugmented mine tailings when compared with the control, indicating that MICP could effectively scavenge different species of Pb (Govarthanan et al, 2013).…”

“…KK1 was used to treat lead contaminated mine tailings containing Pb 1050 mg kg -1 and this resulted in a 26% decrease in the exchangeable Pb fraction in the bioaugmented tailings (Govarthanan et al, 2013). At the same time, the carbonate Pb fraction increased by 38% due to bacterially-mediated precipitation of Pb (see Figure 4b).…”

“…KK1 isolated from Pb contaminated mine tailings effectively biomineralized mobile Pb (Govarthanan et al, 2013). The lead mineral products were lead sulfide (PbS) and lead silicon oxide (PbSiO3) (see Figure 4a).…”

Bioremediation Potential Assessment of Plant Growth-Promoting Autochthonous Bacteria: a Lignite Mine Case Study

“…is considerably constrained by a slow remediation rate, varying field factors, and root depth [5], substantial research efforts have focused on utilizing microorganisms [6][7][8] and plant-microbe interactions [9][10][11] to restore mine tailings and overburden.…”