Bioremediation of strontium (Sr) contaminated aquifer quartz sand based on carbonate precipitation induced by Sr resistant Halomonas sp.

TY - JOUR

T1 - Bioremediation of strontium (Sr) contaminated aquifer quartz sand based on carbonate precipitation induced by Sr resistant Halomonas sp.

AU - Achal, Varenyam

AU - Pan, Xiangliang

AU - Zhang, Daoyong

N1 - Funding Information: This work was supported by the Knowledge Innovation Program of the Chinese Academy of Sciences (KZCX2-YW-335), Program of 100 Distinguished Young Scientists of the Chinese Academy of Sciences, National Natural Science Foundation of China (U1120302, 41150110154, 41072195, 21177127 and 40872169), and the Chinese Academy of Sciences Fellowships for Young International Scientists (2010Y2ZB04).

PY - 2012/10

Y1 - 2012/10

N2 - Contamination of aquifers or sediments by radioactive strontium (90Sr) is a significant environmental problem. In the present study, microbially induced calcite precipitation (MICP) was evaluated for its potential to remediate strontium from aquifer quartz sand. A Sr resistant urease producing Halomonas sp. was characterized for its potential role in bioremediation. The bacterial strain removed 80% of Sr from soluble-exchangeable fraction of aquifer quartz sand. X-ray diffraction detected calcite, vaterite and aragonite along with calcite-strontianite (SrCO3) solid solution in bioremediated sample with indications that Sr was incorporated into the calcite. Scanning electron micrography coupled with energy-dispersive X-ray further confirmed MICP process in remediation. The study showed that MICP sequesters soluble strontium as biominerals and could play an important role in strontium bioremediation from both ecological and greener point of view.

AB - Contamination of aquifers or sediments by radioactive strontium (90Sr) is a significant environmental problem. In the present study, microbially induced calcite precipitation (MICP) was evaluated for its potential to remediate strontium from aquifer quartz sand. A Sr resistant urease producing Halomonas sp. was characterized for its potential role in bioremediation. The bacterial strain removed 80% of Sr from soluble-exchangeable fraction of aquifer quartz sand. X-ray diffraction detected calcite, vaterite and aragonite along with calcite-strontianite (SrCO3) solid solution in bioremediated sample with indications that Sr was incorporated into the calcite. Scanning electron micrography coupled with energy-dispersive X-ray further confirmed MICP process in remediation. The study showed that MICP sequesters soluble strontium as biominerals and could play an important role in strontium bioremediation from both ecological and greener point of view.

KW - Biomineralization

KW - Calcite

KW - Halomonas

KW - Strontianite

KW - Strontium

KW - Urease

UR - http://www.scopus.com/inward/record.url?scp=84864913396&partnerID=8YFLogxK

U2 - 10.1016/j.chemosphere.2012.06.064

DO - 10.1016/j.chemosphere.2012.06.064

M3 - 文章

C2 - 22850277

AN - SCOPUS:84864913396

SN - 0045-6535

VL - 89

SP - 764

EP - 768

JO - Chemosphere

JF - Chemosphere

IS - 6

ER -