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used salt brine will be discharged into the 7 acre double-lined wastewater <br /> evaporation pond for volume reduction by solar evaporation. The discharge is <br /> discussed further in Section D-7.2 Wastewater Discharges. <br /> B. BOILER WATER TREATMENT <br /> Proper management of boiler water purity is required to control steam purity, scale <br /> deposits and corrosion for optimum efficiency of the boiler system. All or some of the <br /> chemicals discussed below will be used in the various parts of the boiler. All of the <br /> reaction products and unreacted residuals of the chemicals added to the boiler <br /> system will discharge by continuous or intermittent blowdown into the wastewater <br /> pond as discussed in Section 7.2 Wastewater Discharges. <br /> The boiler water treatment chemicals will be used for: <br /> • boiler makeup water quality control; <br /> • dissolved oxygen corrosion control; <br /> • pH correction; and <br /> • scale control. <br /> The treatments for each of these are as follows: <br /> Makeup Water <br /> A continuous blowdown of water from the boiler will be required to maintain boiler <br /> efficiency by eliminating excess impurities that build up in the circulating boiler water. <br /> The amount of blowdown is directly related to the quality of makeup water fed to the <br /> system. Makeup water will be purified by treating softened plant water by reverse <br /> osmosis (RO). RO is a process for removing dissolved solids from water by forcing <br /> water under applied pressure through a semipermeable membrane, which will <br /> transmit the water but reject most dissolved materials. This process produces a <br /> concentrated brine of the dissolved solids impurities that will be discharged into the <br /> double-lined 7 acre wastewater pond for volume reduction by solar evaporation. <br /> Depending upon the quality of the softened water that will be used as feed to the RO <br /> unit, sulfuric acid and sodium hexametaphosphate may be required to pretreat the <br /> water ahead of the RO unit to prevent fouling and subsequent blocking of the unit <br /> G:\LMW\78545.002\Reclamation\Reclamexh.DOC D-43 <br />