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Article

Changes in Pumping-Induced Groundwater Quality Used to Supply a Large-Capacity Brackish-Water Desalination Facility, Collier County, Florida: A New Aquifer Conceptual Model

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Emergent Technologies Institute, U. A. Whitaker College of Engineering, Florida Gulf Coast University, 16301 Innovation Lane, Fort Myers, FL 33913, USA
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WSP USA, Inc., 1567 Hayley Lane, Suite 202, Fort Myers, FL 33907, USA
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Groundwater Teck Inc., 14542 Indigo Lakes Circle, Naples, FL 34119, USA
*
Author to whom correspondence should be addressed.
Academic Editor: José Luis Sánchez-Lizaso
Water 2021, 13(14), 1951; https://doi.org/10.3390/w13141951
Received: 30 June 2021 / Revised: 12 July 2021 / Accepted: 13 July 2021 / Published: 15 July 2021
(This article belongs to the Special Issue Groundwater Flow Modeling in Coastal Aquifers)
Brackish-water reverse osmosis (BWRO) desalination facilities are designed to treat feedwater within a fixed range in salinity. If the salinity and ion concentrations of the feedwater rises above the maximum design concentrations, then the plant may ultimately fail. BWRO plants typically use groundwater as a feedwater source. Prior to the process design, a detailed groundwater assessment is made to characterize the source aquifer system and to develop a solute-transport model that is used to project the changes in water quality over the expected useful life of the facility. Solute transport-modeling performed for the Collier County (Florida) South BWRO facility, which was designed to produce 30,303 m3/d with an expansion to 75,758 m3/d, used an aquifer system conceptual model that assumed upwards migration over time of brackish waters with higher salinities into the production zones. This conceptual model is typical of how most BWRO systems developed in the United States operate. The original solute transport model predicted a range of increases in dissolved chloride concentrations over a 20-year period from a low of 5 mg/L/yr, a mid-range of 35 mg/L/yr, and a high range of 85 mg/L/yr. Actual data collected over a 11- to 13.5-year period showed that the dissolved chloride concentration average of the feed water decreased by 16 mg/L/yr. The original conceptual model was found to be inaccurate in that it suggested an upwards recharging system, whereas downward leakage (or perhaps lateral migration) of fresher water appears to be occurring in the system. This is an example of a long-term solute-transport model audit, which is rarely performed, in which a new conceptual model was found to be applicable to an aquifer system used to feed a BWRO facility. View Full-Text
Keywords: hydrogeology; pumping-induced water quality changes; brackish-water desalination; aquifer conceptual models; Collier County; Florida hydrogeology; pumping-induced water quality changes; brackish-water desalination; aquifer conceptual models; Collier County; Florida
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MDPI and ACS Style

Arico, Q.L.; Kassis, Z.R.; Maliva, R.G.; Guo, W.; Manahan, W.S.; Missimer, T.M. Changes in Pumping-Induced Groundwater Quality Used to Supply a Large-Capacity Brackish-Water Desalination Facility, Collier County, Florida: A New Aquifer Conceptual Model. Water 2021, 13, 1951. https://doi.org/10.3390/w13141951

AMA Style

Arico QL, Kassis ZR, Maliva RG, Guo W, Manahan WS, Missimer TM. Changes in Pumping-Induced Groundwater Quality Used to Supply a Large-Capacity Brackish-Water Desalination Facility, Collier County, Florida: A New Aquifer Conceptual Model. Water. 2021; 13(14):1951. https://doi.org/10.3390/w13141951

Chicago/Turabian Style

Arico, Quillan L., Zoie R. Kassis, Robert G. Maliva, Weixing Guo, W. S. Manahan, and Thomas M. Missimer 2021. "Changes in Pumping-Induced Groundwater Quality Used to Supply a Large-Capacity Brackish-Water Desalination Facility, Collier County, Florida: A New Aquifer Conceptual Model" Water 13, no. 14: 1951. https://doi.org/10.3390/w13141951

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