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Electrodialysis reversal (EDR) was pilot tested on moderate total dissolved solids (TDS), highsilica groundwater with elevated levels of fluoride and arsenic at Fort Irwin, California. During75 days of continuous testing, results demonstrated that with minimal pretreatment, EDR wascapable of producing water that consistently met the Fort Irwin water quality goals and State ofCalifornia water quality requirements. The pilot unit was optimized to maximize feedwaterrecovery while staying within safe operating parameters relative to applied voltage and sparinglysoluble salt supersaturation. A scale inhibitor and hydrochloric acid were added at low doses tothe concentrate recycle loop to enhance recovery. Activated Alumina, regenerable, (AAR) wasalso tested at Fort Irwin. Results indicated that this technology was capable of removing arsenicand fluoride; however, the process was heavily impacted by high concentrations of silica in theFort Irwin source water. This article presents the results of AAR and EDR pilot testing, whichwas performed to help select and design a full-scale facility for the Fort Irwin new6-million-gallon-per-day (mgd) water treatment plant. Includes 3 references, tables, figures.

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Edition: Vol. - No. Published: 03/01/2007 Number of Pages: 17File Size: 1 file , 480 KB