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Brackish water desalination is an important alternative for developing drinking water sources inwater-scarce arid regions. Both electrodialysis reversal (EDR) and reverse osmosis (RO) aresuitable technologies for desalination of brackish groundwater. The RO pilot testing, conductedwith the groundwater from San Pasqual water basin (San Diego, California), containing 1300 mg/L ofTDS and 60 mg/L of silica, demonstrated that the RO process could be operated at 10 gfd with75% recovery and 96% total dissolved solids (TDS) rejection with an estimated cleaning frequency of 2 months. Theperformance of the EDR process, predicted from the modeling using WATSYS software for thesame water chemistry, indicated that this process could be operated at 88% recovery with theTDS rejection of 78%. The order of magnitude cost estimates (-30% and +50%) were preparedfor three different feed flow scenarios (3, 5, 8 MGD) for RO and EDR treating the samegroundwater suggested that both processes were cost comparable. However, the costs associatedwith the concentrate disposal were not considered in this cost estimation. Includes 9 references, tables, figures.

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Edition: Vol. - No. Published: 11/01/2009 Number of Pages: 14File Size: 1 file , 860 KB