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- W2626514892 abstract "A new water treatment system is planned for Fort Irwin in Barstow, California to address existing regulatory requirements and to account for anticipated expansion at the installation. Fort Irwin has indicated a water recovery requirement of 99%. Achieving this level will require a treatment system for the electrodialysis reversal (EDR) reject stream that will recover 92% of the influent water. CH2M HILL has proposed a system consisting of partial lime softening, filtration, and reverse osmosis (RO), which would increase water recovery to an estimated 98%. To reach 99%, a mechanical vapor recompression evaporative-distillation (MVR evaporator) unit has also been proposed. The purpose of the current study was to use laboratory testing to evaluate the effectiveness of partial lime softening, RO, and electrocoagulation (EC). Tests were as follows: Partial lime softening was evaluated at dosages of 500-2000 mg/L of hydrated lime [Ca(OH)2]. Partial lime softening (1500 mg/L dose) was combined with magnesium chloride (MgCl2) to improve performance. Electrocoagulation (EC) was tested as an alternative to partial lime softening. RO testing was carried out using a General Electric (GE) polyamide AD membrane, a membrane designed for desalination of seawater. The study indicates that partial lime softening with MgCl2 as an additive will be effective for pretreating water entering the RO unit. RO treatment was effective at meeting treatment and recovery goals, although fouling should be monitored. Evaporative distillation was not tested in this study, and analysis indicates that the costs per gallon are relatively high. However, it may be worth the cost due to the severe water management issues faced by Fort Irwin. Care must be taken to optimize the other processes so that the application of the evaporative-distillation unit can be minimized, saving costs. DISCLAIMER: The contents of this report are not to be used for advertising, publication, or promotional purposes. Citation of trade names does not constitute an official endorsement or approval of the use of such commercial products. All product names and trademarks cited are the property of their respective owners. The findings of this report are not to be construed as an official Department of the Army position unless so designated by other authorized documents. DESTROY THIS REPORT WHEN NO LONGER NEEDED. DO NOT RETURN IT TO THE ORIGINATOR. ERDC/EL TR-12-30 iii" @default.
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- W2626514892 date "2012-12-01" @default.
- W2626514892 modified "2023-09-26" @default.
- W2626514892 title "Laboratory study for evaluating performance of unit processes to treat the electrodialysis reversal (EDR) reject stream for the proposed Fort Irwin water treatment plant" @default.
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