Saline Groundwater from Coastal Aquifers As a Source for Desalination

Shaked Stein, Amos Russak, Orit Sivan, Yoseph Yechieli, Eyal Rahav, Yoram Oren, Roni Kasher

Research output: Contribution to journalArticlepeer-review

26 Scopus citations

Abstract

Reverse osmosis (RO) seawater desalination is currently a widespread means of closing the gap between supply and demand for potable water in arid regions. Currently, one of the main setbacks of RO operation is fouling, which hinders membrane performance and induces pressure loss, thereby reducing system efficiency. An alternative water source is saline groundwater with salinity close to seawater, pumped from beach wells in coastal aquifers which penetrate beneath the freshwater-seawater interface. In this research, we studied the potential use of saline groundwater of the coastal aquifer as feedwater for desalination in comparison to seawater using fieldwork and laboratory approaches. The chemistry, microbiology and physical properties of saline groundwater were characterized and compared with seawater. Additionally, reverse osmosis desalination experiments in a cross-flow system were performed, evaluating the permeate flux, salt rejection and fouling propensities of the different water types. Our results indicated that saline groundwater was significantly favored over seawater as a feed source in terms of chemical composition, microorganism content, silt density, and fouling potential, and exhibited better desalination performance with less flux decline. Saline groundwater may be a better water source for desalination by RO due to lower fouling potential, and reduced pretreatment costs.

Original languageEnglish
Pages (from-to)1955-1963
Number of pages9
JournalEnvironmental Science & Technology
Volume50
Issue number4
DOIs
StatePublished - 16 Feb 2016

ASJC Scopus subject areas

  • Chemistry (all)
  • Environmental Chemistry

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