Journal
CHEMOSPHERE
Volume 168, Issue -, Pages 529-538Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2016.11.037
Keywords
Fe-reducing bacteria; Sulfate-reducing bacteria; Sorption; Arsenic(V); Nano; FeS-coated limestone
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Funding
- National Natural Science Foundation of China [41372051, 487]
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The iron-reducing bacterium Acidiphilium cryputum JF-5 and a sulfate reducing bacterium (SRB) collected and purified from the mine drainage of a copper mine in the northwest of Sichuan Province, China, were used to biologically synthesize nano-sized FeS-coated limestone to remove As(V) from solution. The adsorption efficiency of As(V) is improved from 6.64 mu g/g with limestone alone to 187 gig with the FeS coated limestone in both batch and column experiments. The hydraulic conductivity of the columns are also improved by the presence of the nano-sized FeS coatings, but the solution neutralization performance of the limestone can be reduced by passivation by gypsum and Fe(III) precipitates. Calculations for FeS-coated limestone dissolution experiments show that the process can be described as n(Ca.sol) = At-1/2 - n(Ca.zyp). The results suggest that FeS-coated limestone may be an effective medium for remediatingAs(V)-bearing solutions such as acid mine drainage in systems such as Permeable Reactive Barriers. (C) 2016 Elsevier Ltd. All rights reserved.
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