Biomineralization based remediation of As(III) contaminated soil by Sporosarcina ginsengisoli

Varenyam Achal, Xiangliang Pan*, Qinglong Fu, Daoyong Zhang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

124 Scopus citations

Abstract

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.

Original languageEnglish
Pages (from-to)178-184
Number of pages7
JournalJournal of Hazardous Materials
Volume201-202
DOIs
StatePublished - 30 Jan 2012
Externally publishedYes

Keywords

  • Arsenic
  • Bioremediation
  • Microbial calcite
  • Sporosarcina ginsengisoli

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