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Hydrology 2017, 4(1), 1; doi:10.3390/hydrology4010001

Provision of Desalinated Irrigation Water by the Desalination of Groundwater within a Saline Aquifer

DCA Consultants Ltd., Haughend Farm, Bridge of Earn Road, Dunning, Perthshire PH2 9BX, UK
Academic Editor: Harrie-Jan Hendricks Franssen
Received: 30 June 2016 / Revised: 24 November 2016 / Accepted: 14 December 2016 / Published: 22 December 2016

Abstract

Irrigated land accounts for 70% of global water usage and 30% of global agricultural production. Forty percent of this water is derived from groundwater. Approximately 20%–30% of the groundwater sources are saline and 20%–50% of global irrigation water is salinized. Salinization reduces crop yields and the number of crop varieties which can be grown on an arable holding. Structured ZVI (zero valent iron, Fe0 pellets desalinate water by storing the removed ions as halite (NaCl) within their porosity. This allows an “Aquifer Treatment Zone” to be created within an aquifer, (penetrated by a number of wells (containing ZVI pellets)). This zone is used to supply partially desalinated water directly from a saline aquifer. A modeled reconfigured aquifer producing a continuous flow (e.g., 20 m3/day, 7300 m3/a) of partially desalinated irrigation water is used to illustrate the impact of porosity, permeability, aquifer heterogeneity, abstraction rate, Aquifer Treatment Zone size, aquifer thickness, optional reinjection, leakage and flow by-pass on the product water salinity. This desalination approach has no operating costs (other than abstraction costs (and ZVI regeneration)) and may potentially be able to deliver a continuous flow of partially desalinated water (30%–80% NaCl reduction) for $0.05–0.5/m3. View Full-Text
Keywords: desalination; salinization; irrigation; zero valent iron (ZVI, Fe0); aquifer desalination; salinization; irrigation; zero valent iron (ZVI, Fe0); aquifer
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Antia, D.D.J. Provision of Desalinated Irrigation Water by the Desalination of Groundwater within a Saline Aquifer. Hydrology 2017, 4, 1.

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