Immobilization of cadmium in soil by microbially induced carbonate precipitation with Exiguobacterium undae at low temperature
Journal
International Biodeterioration and Biodegradation
Journal Volume
94
Pages
98-102
Date Issued
2014
Author(s)
Abstract
Microbially induced carbonate precipitation (MICP) is an advanced biological treatment technology to immobilize heavy metals in form of carbonate salts. In this MICP study, ureolytic Exiguobacterium undae was employed for immobilization of cadmium in contaminated soil at low temperature (10¢XC). The sequential extraction test revealed conversion of more than 90% of cadmium in the tested soil from the soluble-exchangeable fraction to carbonate-bound fraction in 14 days of treatment. The cadmium may be precipitated in a separate CdCO3 phase or be co-precipitated in calcite crystals. Activities of urease and dehydrogenase were enhanced during MICP, which were not affected by the testing temperatures. MICP with E. undae is a biological approach that may be worth investigating further to immobilize cadmium in soils of cold regimes. ? 2014 Elsevier Ltd.
Subjects
Bioremediation
Dehydrogenase
Heavy metal
Microbial carbonate
Urase
Type
journal article