CO 2 Leakage-induced contamination in shallow potable aquifer and associated health risk assessment

Chan Yeong Kim, Weon Shik Han, Eungyu Park, Jina Jeong, Tianfu Xu

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Leakage of stored CO 2 from a designated deep reservoir could contaminate overlying shallow potable aquifers by dissolution of arsenic-bearing minerals. To elucidate CO 2 leakage-induced arsenic contamination, 2D multispecies reactive transport models were developed and CO 2 leakage processes were simulated in the shallow groundwater aquifer. Throughout a series of numerical simulations, it was revealed that the movement of leaked CO 2 was primarily governed by local flow fields within the shallow potable aquifer.The induced low-pH plume caused dissolution of aquifer minerals and sequentially increased permeabilities of the aquifer; in particular, the most drastic increase in permeability appeared at the rear margin of CO 2 plume where two different types of groundwater mixed. The distribution of total arsenic (σAs) plume was similar to the one for the arsenopyrite dissolution. The breakthrough curve of σAs monitored at the municipal well was utilized to quantify the human health risk. In addition, sensitivity studieswere conducted with different sorption rates of arsenic species,CO 2 leakage rates, and horizontal permeability in the aquifer. In conclusion, the human health risk was influenced by the shape of σAs plume, which was, in turn, affected by the characteristics of CO 2 plume behavior such as horizontal permeability and CO 2 leakage rate.

Original languageEnglish
Article number4834601
JournalGeofluids
Volume2018
DOIs
Publication statusPublished - 2018 Jan 1

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health risk
leakage
arsenic
risk assessment
aquifer
plume
permeability
dissolution
groundwater
reactive transport
arsenopyrite
breakthrough curve
mineral
flow field
contamination
sorption
simulation
rate
human health

All Science Journal Classification (ASJC) codes

  • Earth and Planetary Sciences(all)

Cite this

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abstract = "Leakage of stored CO 2 from a designated deep reservoir could contaminate overlying shallow potable aquifers by dissolution of arsenic-bearing minerals. To elucidate CO 2 leakage-induced arsenic contamination, 2D multispecies reactive transport models were developed and CO 2 leakage processes were simulated in the shallow groundwater aquifer. Throughout a series of numerical simulations, it was revealed that the movement of leaked CO 2 was primarily governed by local flow fields within the shallow potable aquifer.The induced low-pH plume caused dissolution of aquifer minerals and sequentially increased permeabilities of the aquifer; in particular, the most drastic increase in permeability appeared at the rear margin of CO 2 plume where two different types of groundwater mixed. The distribution of total arsenic (σAs) plume was similar to the one for the arsenopyrite dissolution. The breakthrough curve of σAs monitored at the municipal well was utilized to quantify the human health risk. In addition, sensitivity studieswere conducted with different sorption rates of arsenic species,CO 2 leakage rates, and horizontal permeability in the aquifer. In conclusion, the human health risk was influenced by the shape of σAs plume, which was, in turn, affected by the characteristics of CO 2 plume behavior such as horizontal permeability and CO 2 leakage rate.",
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CO 2 Leakage-induced contamination in shallow potable aquifer and associated health risk assessment . / Kim, Chan Yeong; Han, Weon Shik; Park, Eungyu; Jeong, Jina; Xu, Tianfu.

In: Geofluids, Vol. 2018, 4834601, 01.01.2018.

Research output: Contribution to journalArticle

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