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

Yamini Satyawali; Piet Seuntjens; Sandra Van Roy; Ingeborg Joris; Silvia Vangeel; Winnie Dejonghe; Karolien Vanbroekhoven

doi:10.1016/j.jconhyd.2010.12.009

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

Yamini Satyawali, Piet Seuntjens, Sandra Van Roy, Ingeborg Joris, Silvia Vangeel, Winnie Dejonghe, Karolien Vanbroekhoven

Research output: Contribution to journal › Article › peer-review

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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.

Original language	English (US)
Pages (from-to)	83-93
Number of pages	11
Journal	Journal of Contaminant Hydrology
Volume	123
Issue number	3-4
DOIs	https://doi.org/10.1016/j.jconhyd.2010.12.009
State	Published - Apr 2011
Externally published	Yes

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledged KAUST grant number(s): KUK-C1-017-12
Acknowledgements: 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/).
This publication acknowledges KAUST support, but has no KAUST affiliated authors.

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10.1016/j.jconhyd.2010.12.009

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title = "The addition of organic carbon and nitrate affects reactive transport of heavy metals in sandy aquifers",

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. {\textcopyright} 2010 Elsevier B.V.",

author = "Yamini Satyawali and Piet Seuntjens and {Van Roy}, Sandra and Ingeborg Joris and Silvia Vangeel and Winnie Dejonghe and Karolien Vanbroekhoven",

note = "KAUST Repository Item: Exported on 2020-10-01 Acknowledged KAUST grant number(s): KUK-C1-017-12 Acknowledgements: 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/). This publication acknowledges KAUST support, but has no KAUST affiliated authors.",

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AU - Satyawali, Yamini

AU - Seuntjens, Piet

AU - Van Roy, Sandra

AU - Joris, Ingeborg

AU - Vangeel, Silvia

AU - Dejonghe, Winnie

AU - Vanbroekhoven, Karolien

N1 - KAUST Repository Item: Exported on 2020-10-01 Acknowledged KAUST grant number(s): KUK-C1-017-12 Acknowledgements: 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/). This publication acknowledges KAUST support, but has no KAUST affiliated authors.

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N2 - 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.

AB - 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.

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SN - 0169-7722

VL - 123

SP - 83

EP - 93

JO - Journal of Contaminant Hydrology

JF - Journal of Contaminant Hydrology

IS - 3-4

ER -

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

Abstract

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