Abstract
Chemical remediation of soil and groundwater containing hexavalent chromium (Cr(VI)) was carried out under batch and semi-batch conditions using different iron species: (Fe(II) (sulphate solution); Fe0 G (granulated elemental iron); ZVIne (non-stabilized zerovalent iron) and ZVIcol (colloidal zerovalent iron). ZVIcol was synthesized using different experimental conditions with carboxymethyl cellulose (CMC) and ultra-sound. Chemical analysis revealed that the contaminated soil (frank clay sandy texture) presented an average Cr(VI) concentration of 456 ± 35 mg kg−1. Remediation studies carried out under batch conditions indicated that 1.00 g of ZVIcol leads to a chemical reduction of ∼280 mg of Cr(VI). Considering the fractions of Cr(VI) present in soil (labile, exchangeable and insoluble), it was noted that after treatment with ZVIcol (semi-batch conditions and pH 5) only 2.5% of these species were not reduced. A comparative study using iron species was carried out in order to evaluate the reduction potentialities exhibited by ZVIcol. Results obtained under batch and semi-batch conditions indicate that application of ZVIcol for the “in situ” remediation of soil and groundwater containing Cr(VI) constitutes a promising technology.
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Acknowledgements
The authors wish to thank the National Scientific Council for Research and Development (CNPq—Brazil) and Dr. Carol Collins for her technical assistance with the English.
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Glossary
- MCV
-
Maximum concentration value for Cr(VI)
- SGW
-
Synthetic groundwater
- ZVIne
-
Non-stabilized zerovalent iron
- ZVIcol
-
Colloidal zerovalent iron stabilized using CMC
- Fe0 G
-
Granulated zerovalent iron
- Fe(II)
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Ferrous sulfate solution
- CMC
-
Carboxymethyl cellulose
- PV
-
Pore volume (−)
- G
-
Volumetric flow rate (ml min−1)
- ν
-
Linear velocity of the fluid (cm h−1)
- k VD
-
Volumetric mass dispersion coefficient (h−1)
- k obs
-
Pseudo-first order kinetic rate constant for the redox reaction (h−1)
- k obs*
-
Overall pseudo-first order kinetic rate constant for the redox reaction (h−1)
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Franco, D.V., Da Silva, L.M. & Jardim, W.F. Reduction of Hexavalent Chromium in Soil and Ground Water Using Zero-Valent Iron Under Batch and Semi-Batch Conditions. Water Air Soil Pollut 197, 49–60 (2009). https://doi.org/10.1007/s11270-008-9790-0
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DOI: https://doi.org/10.1007/s11270-008-9790-0