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    The addition of organic carbon and nitrate affects reactive transport of heavy metals in sandy aquifers

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    Type
    Article
    Authors
    Satyawali, Yamini
    Seuntjens, Piet
    Van Roy, Sandra
    Joris, Ingeborg
    Vangeel, Silvia
    Dejonghe, Winnie
    Vanbroekhoven, Karolien
    KAUST Grant Number
    KUK-C1-017-12
    Date
    2011-04
    Permanent link to this record
    http://hdl.handle.net/10754/599872
    
    Metadata
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    Abstract
    Organic carbon introduction in the soil to initiate remedial measures, nitrate infiltration due to agricultural practices or sulphate intrusion owing to industrial usage can influence the redox conditions and pH, thus affecting the mobility of heavy metals in soil and groundwater. This study reports the fate of Zn and Cd in sandy aquifers under a variety of plausible in-situ redox conditions that were induced by introduction of carbon and various electron acceptors in column experiments. Up to 100% Zn and Cd removal (from the liquid phase) was observed in all the four columns, however the mechanisms were different. Metal removal in column K1 (containing sulphate), was attributed to biological sulphate reduction and subsequent metal precipitation (as sulphides). In the presence of both nitrate and sulphate (K2), the former dominated the process, precipitating the heavy metals as hydroxides and/or carbonates. In the presence of sulphate, nitrate and supplemental iron (Fe(OH)3) (K3), metal removal was also due to precipitation as hydroxides and/or carbonates. In abiotic column, K4, (with supplemental iron (Fe(OH)3), but no nitrate), cation exchange with soil led to metal removal. The results obtained were modeled using the reactive transport model PHREEQC-2 to elucidate governing processes and to evaluate scenarios of organic carbon, sulphate and nitrate inputs. © 2010 Elsevier B.V.
    Citation
    Satyawali Y, Seuntjens P, Van Roy S, Joris I, Vangeel S, et al. (2011) The addition of organic carbon and nitrate affects reactive transport of heavy metals in sandy aquifers. Journal of Contaminant Hydrology 123: 83–93. Available: http://dx.doi.org/10.1016/j.jconhyd.2010.12.009.
    Sponsors
    This work was supported by the European Union FP6 Integrated Project AquaTerra (Project no. GOCE 505428) under the thematic priority, sustainable development, global change and ecosystems. This publication is also based on the work supported by Award No. KUK-C1-017-12, made by King Abdullah University of Science and Technology (KAUST) (http://www.sowacor.nl/).
    Publisher
    Elsevier BV
    Journal
    Journal of Contaminant Hydrology
    DOI
    10.1016/j.jconhyd.2010.12.009
    PubMed ID
    21237527
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.jconhyd.2010.12.009
    Scopus Count
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