TY - JOUR
T1 - Biomineralization based remediation of As(III) contaminated soil by Sporosarcina ginsengisoli
AU - Achal, Varenyam
AU - Pan, Xiangliang
AU - Fu, Qinglong
AU - Zhang, Daoyong
N1 - Funding Information:
This work was supported by Knowledge Innovation Program of 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, 40673070 and 40872169) and Chinese Academy of Sciences Fellowships for Young International Scientists (2010Y2ZB04).
PY - 2012/1/30
Y1 - 2012/1/30
N2 - Arsenic is a highly toxic metalloid and has posed high risk to the environment. As(III) is highly mobile in soil and leached easily into groundwater. The current remediation techniques are not sufficient to immobilize this toxic element. In the present study, an As(III) tolerant bacterium . Sporosarcina ginsengisoli CR5 was isolated from As contaminated soil of Urumqi, China. We investigated the role of microbial calcite precipitated by this bacterium to remediate soil contaminated with As(III). The bacterium was able to grow at high As(III) concentration of 50. mM. In order to obtain arsenic distribution pattern, five stage soil sequential extraction was carried out. Arsenic mobility was found to significantly decrease in the exchangeable fraction of soil and subsequently the arsenic concentration was markedly increased in carbonated fraction after bioremediation. Microbially induced calcite precipitation (MICP) process in bioremediation was further confirmed by ATR-FTIR and XRD analyses. XRD spectra showed presence of various biomineralization products such as calcite, gwihabaite, aragonite and vaterite in bioremediated soil samples. The results from this study have implications that MICP based bioremediation by . S. ginsengisoli is a viable, environmental friendly technology for remediation of the arsenic contaminated sites.
AB - Arsenic is a highly toxic metalloid and has posed high risk to the environment. As(III) is highly mobile in soil and leached easily into groundwater. The current remediation techniques are not sufficient to immobilize this toxic element. In the present study, an As(III) tolerant bacterium . Sporosarcina ginsengisoli CR5 was isolated from As contaminated soil of Urumqi, China. We investigated the role of microbial calcite precipitated by this bacterium to remediate soil contaminated with As(III). The bacterium was able to grow at high As(III) concentration of 50. mM. In order to obtain arsenic distribution pattern, five stage soil sequential extraction was carried out. Arsenic mobility was found to significantly decrease in the exchangeable fraction of soil and subsequently the arsenic concentration was markedly increased in carbonated fraction after bioremediation. Microbially induced calcite precipitation (MICP) process in bioremediation was further confirmed by ATR-FTIR and XRD analyses. XRD spectra showed presence of various biomineralization products such as calcite, gwihabaite, aragonite and vaterite in bioremediated soil samples. The results from this study have implications that MICP based bioremediation by . S. ginsengisoli is a viable, environmental friendly technology for remediation of the arsenic contaminated sites.
KW - Arsenic
KW - Bioremediation
KW - Microbial calcite
KW - Sporosarcina ginsengisoli
UR - http://www.scopus.com/inward/record.url?scp=84855349868&partnerID=8YFLogxK
U2 - 10.1016/j.jhazmat.2011.11.067
DO - 10.1016/j.jhazmat.2011.11.067
M3 - 文章
C2 - 22154871
AN - SCOPUS:84855349868
SN - 0304-3894
VL - 201-202
SP - 178
EP - 184
JO - Journal of Hazardous Materials
JF - Journal of Hazardous Materials
ER -