Geochemical processes during managed aquifer recharge with desalinated seawater

Y. Ganot, R. Holtzman, N. Weisbrod, A. Russak, Y. Katz, D. Kurtzman

Research output: Contribution to journalMeeting Abstract

Abstract

In this work we study the geochemical processes along the variably-saturated zone during managed aquifer recharge (MAR) with reverse-osmosis desalinated seawater (DSW) to an infiltration pond at the Menashe site, located above the Israeli coastal aquifer. The DSW is post-treated by calcite dissolution (remineralization) in order to meet the Israeli desalinated water quality criteria. Suction cups and monitoring wells inside the pond were used to monitor water quality during two MAR events on 2015 and 2016. Results show that cation exchange is dominant, driven by the high Ca2+ concentration in the post-treated DSW. Stable isotope analysis shows that the composition of the shallow groundwater is similar to the recharged DSW, but with enrichment of Mg2+, Na+, Ca2+ and HCO3-. A calibrated variably-saturated reactive transport model was used to predict the geochemical evolution during 50 years of MAR with two water quality scenarios: post-treated DSW and soft DSW (without post-treatment). The latter scenario was aimed to test soil-aquifer-treatment as an alternative post-treatment technique. In terms of water quality, the results of the two scenarios were found within the range of the desalinated water criteria. Mg2+ enrichment was stable ( 2.5 mg L-1), higher than the zero concentration found in the Israeli DSW. Calcite content reduction was low (
Original languageEnglish GB
JournalGeophysical Research Abstracts
StatePublished - 1 Dec 2017
EventAmerican Geophysical Union, Fall Meeting 2017 - New Orleans, United States
Duration: 11 Dec 201715 Dec 2017
https://www.ncei.noaa.gov/news/agu-2017

Keywords

  • 1807 Climate impacts
  • HYDROLOGY
  • 1829 Groundwater hydrology
  • 1834 Human impacts
  • 1880 Water management

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