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

Handle URI:
http://hdl.handle.net/10754/599872
Title:
The addition of organic carbon and nitrate affects reactive transport of heavy metals in sandy aquifers
Authors:
Satyawali, Yamini; Seuntjens, Piet; Van Roy, Sandra; Joris, Ingeborg; Vangeel, Silvia; Dejonghe, Winnie; Vanbroekhoven, Karolien
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.
Publisher:
Elsevier BV
Journal:
Journal of Contaminant Hydrology
KAUST Grant Number:
KUK-C1-017-12
Issue Date:
Apr-2011
DOI:
10.1016/j.jconhyd.2010.12.009
PubMed ID:
21237527
Type:
Article
ISSN:
0169-7722
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/).
Appears in Collections:
Publications Acknowledging KAUST Support

Full metadata record

DC FieldValue Language
dc.contributor.authorSatyawali, Yaminien
dc.contributor.authorSeuntjens, Pieten
dc.contributor.authorVan Roy, Sandraen
dc.contributor.authorJoris, Ingeborgen
dc.contributor.authorVangeel, Silviaen
dc.contributor.authorDejonghe, Winnieen
dc.contributor.authorVanbroekhoven, Karolienen
dc.date.accessioned2016-02-28T06:31:23Zen
dc.date.available2016-02-28T06:31:23Zen
dc.date.issued2011-04en
dc.identifier.citationSatyawali 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.en
dc.identifier.issn0169-7722en
dc.identifier.pmid21237527en
dc.identifier.doi10.1016/j.jconhyd.2010.12.009en
dc.identifier.urihttp://hdl.handle.net/10754/599872en
dc.description.abstractOrganic 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.en
dc.description.sponsorshipThis 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/).en
dc.publisherElsevier BVen
dc.titleThe addition of organic carbon and nitrate affects reactive transport of heavy metals in sandy aquifersen
dc.typeArticleen
dc.identifier.journalJournal of Contaminant Hydrologyen
dc.contributor.institutionFlemish Institute for Technological Research, Mol, Belgiumen
dc.contributor.institutionUniversiteit Gent, Ghent, Belgiumen
dc.contributor.institutionUniversiteit Antwerpen, Antwerpen, Belgiumen
kaust.grant.numberKUK-C1-017-12en

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