Journal
CHEMOSPHERE
Volume 197, Issue -, Pages 33-41Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2018.01.017
Keywords
Soil; Heavy metal; Bioremediation; Rhodobacter sphaeroides; Cadmium; Zinc
Categories
Funding
- National Natural Science Foundation of China [51778031, 21707006, 51708012]
- Beijing Natural Science Foundation [8142027]
- Excellence Foundation of BUAA for PhD Students [2017068]
- open projects of collaborative innovation center of Suzhou regional development [2015SZXTZXK04]
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Bioremediation using microorganisms is a promising technique to remediate soil contaminated with heavy metals. In this study, Rhodobacter sphaeroides was used to bioremediate soils contaminated with cadmium (Cd) and zinc (Zn). The study found that the treatment reduced the overall bioavailable fractions (e.g., exchangeable and carbonate bound phases) of Cd and Zn. More stable fractions (e.g., Fe-Mn oxide, organic bound, and residual phases (only for Zn)) increased after bioremediation. A wheat seedling experiment revealed that the phytoavailability of Cd was reduced after bioremediation using sphaeroides. After bioremediation, the exchangeable phases of Cd and Zn in soil were reduced by as much as 30.7% and 100.0%, respectively; the Cd levels in wheat leaf and root were reduced by as much as 62.3% and 47.2%, respectively. However, when the soils were contaminated with very high levels of Cd and Zn (Cd 54.97-65.33 mg kg(-1); Zn 813.4-964.8 mg kg(-1)), bioremediation effects were not clear. The study also found that R. sphaeroides bioremediation in soil can enhance the Zn/Cd ratio in the harvested wheat leaf and root overall. This indicates potentially favorable application in agronomic practice and biofortification. Although remediation efficiency in highly contaminated soil was not significant, R. sphaeroides may be potentially and practically applied to the bioremediation of soils co-contaminated by Cd and Zn. (C) 2018 Elsevier Ltd. All rights reserved.
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