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פותח על ידי קלירמאש פתרונות בע"מ -
Geochemical Processes During Managed Aquifer Recharge With Desalinated Seawater
Year:
2018
Source of publication :
Water Resources Research
Authors :
גנות, יונתן
;
.
קורצמן, דניאל
;
.
Volume :
54
Co-Authors:

Weisbrod, N.; Russak, A.; Katz, Y.; Holtzman, R.

Facilitators :
From page:
978
To page:
994
(
Total pages:
17
)
Abstract:

We study geochemical processes along the variably-saturated zone during managed aquifer recharge (MAR) with reverse-osmosis desalinated seawater (DSW). The DSW, post-treated at the desalination plant by calcite dissolution (remineralization) to meet the Israeli water quality standards, is recharged into the Israeli Coastal Aquifer through an infiltration pond. Water quality monitoring during two MAR events using suction cups and wells inside the pond indicates that cation exchange is the dominant subsurface reaction, driven by the high Ca2+ concentration in the post-treated DSW. Stable isotope analysis shows that the shallow groundwater composition is similar to the recharged DSW, except for enrichment of Mg2+, Na+, Ca2+, and HCO3-. A calibrated variably-saturated reactive transport model is used to predict the geochemical evolution during 50 years of MAR for two water quality scenarios: (i) post-treated DSW (current practice) and (ii) soft DSW (lacking the remineralization post-treatment process). The latter scenario was aimed to test soil-aquifer-treatment (SAT) as an alternative post-treatment technique. Both scenarios provide an enrichment of ∼2.5 mg L-1 in Mg2+ due to cation exchange, compared to practically zero Mg2+ currently found in the Israeli DSW. Simulations of the alternative SAT scenario provide Ca2+ and HCO3- remineralization due to calcite dissolution at levels that meet the Israeli standard for DSW. The simulated calcite content reduction in the sediments below the infiltration pond after 50 years of MAR was low (<1%). Our findings suggest that remineralization using SAT for DSW is a potentially sustainable practice at MAR sites overlying calcareous sandy aquifers. © 2018. American Geophysical Union.

Note:
Related Files :
Desalinated seawater
Ion enrichment
Managed aquifer recharge (MAR)
Reactive transport
Soil aquifer treatment (SAT)
Variably saturated
עוד תגיות
תוכן קשור
More details
DOI :
https://doi.org/10.1002/2017WR021798
Article number:
0
Affiliations:

Institute of Soil, Water and Environmental Sciences, The Volcani Center, Agricultural Research OrganizationRishon LeZion Israel; Hydrology and Water ResourcesHebrew University of JerusalemRehovot Israel; Department of Environmental Hydrology and MicrobiologyZuckerberg Institute for Water Research, Jacob Blaustein Institutes for Desert Research, Ben-Gurion University of the NegevMidreshet Ben-Gurion Israel; Mekorot, Water Company LtdTel Aviv Israel

Database:
סקופוס
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
36314
Last updated date:
02/03/2022 17:27
Creation date:
05/08/2018 08:45
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Scientific Publication
Geochemical Processes During Managed Aquifer Recharge With Desalinated Seawater
54

Weisbrod, N.; Russak, A.; Katz, Y.; Holtzman, R.

Geochemical Processes During Managed Aquifer Recharge With Desalinated Seawater

We study geochemical processes along the variably-saturated zone during managed aquifer recharge (MAR) with reverse-osmosis desalinated seawater (DSW). The DSW, post-treated at the desalination plant by calcite dissolution (remineralization) to meet the Israeli water quality standards, is recharged into the Israeli Coastal Aquifer through an infiltration pond. Water quality monitoring during two MAR events using suction cups and wells inside the pond indicates that cation exchange is the dominant subsurface reaction, driven by the high Ca2+ concentration in the post-treated DSW. Stable isotope analysis shows that the shallow groundwater composition is similar to the recharged DSW, except for enrichment of Mg2+, Na+, Ca2+, and HCO3-. A calibrated variably-saturated reactive transport model is used to predict the geochemical evolution during 50 years of MAR for two water quality scenarios: (i) post-treated DSW (current practice) and (ii) soft DSW (lacking the remineralization post-treatment process). The latter scenario was aimed to test soil-aquifer-treatment (SAT) as an alternative post-treatment technique. Both scenarios provide an enrichment of ∼2.5 mg L-1 in Mg2+ due to cation exchange, compared to practically zero Mg2+ currently found in the Israeli DSW. Simulations of the alternative SAT scenario provide Ca2+ and HCO3- remineralization due to calcite dissolution at levels that meet the Israeli standard for DSW. The simulated calcite content reduction in the sediments below the infiltration pond after 50 years of MAR was low (<1%). Our findings suggest that remineralization using SAT for DSW is a potentially sustainable practice at MAR sites overlying calcareous sandy aquifers. © 2018. American Geophysical Union.

Scientific Publication
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