원문정보
초록
영어
Contamination by radioactive strontium (90Sr) is a significant environmental problem. In this study, biomineralization based microbially induced calcite precipitation (MICP) seems to be a promising technique to sequestration of strontium from contaminated environments. Fifty-two ureolytic bacterial strains were newly isolated from various environments. From these, three strains were selected based on significant qualitative urease production by observing enzyme activity on urea agar plates and identified by 16S rDNA sequencing. The 3 strains (WJ-10, TB-22, TB-15) and positive control (Sporosarcina pasteurii KCTC3558) against groundwater environmental stresses such as salt, temperature, pH, starvation and strontium stresses. S. pasteurii showed a lower resistance capacity. On the other hand, the 3 strains was strongly resistance capacity and high strontium concentration (20 mM). Microbially induced calcite precipitation (MICP) process in sequestration was further confirmed by XRD analyses. XRD spectra showed presence of various sequestration products such as strontianite in samples.