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<br />W <br />-...l <br />CJl <br />en <br /> <br />AIR IN <br /> <br />b. Brine Concentration Options. - In addition to conventional <br />softening and water treatment, brine concentration options using <br />RO (reverse osmosis) desalting processes and brine evaporators/ <br />condensers have served to extend cooling water use by recycling and <br />reuse, Figure 6 shows a train of processes now used in at least one <br />powerplant in the Basin to meet zero discharge requirements and <br />extend cooling water supplies, Commercially available RO membrane <br />desalting plants can easily operate under the TDS feed water require- <br />ments expected from fooling tower makeup or side stream sources, By <br />operating in series with a brine evaporator, a net cost savings is <br />realized by offsetting a portion of the energy and capacity require- <br />ments for the brine concentrator, Brine concentrators are currently <br />installed in four major powerplants in the Colorado River Basin: <br /> <br />San Juan Generating Station <br />Navajo Generation Station <br />Huntington Generating Station <br />Jim Bridger Generating Station <br /> <br />AIR AND VAPOR OUT <br /> <br /> <br />CIRCULATING COOLING WATER I HOT I <br /> <br />MAIN <br />CONDENSER <br /> <br /> <br />COOLING WUER (COLD I <br />PRODUCT <br /> <br />PRODUCT <br />WATER <br />TO <br />BOIL E R <br />FEED <br /> <br />SIDE-STREAM <br />SOFTENING <br />FILTRATION <br /> <br /> <br />BRINE <br />CONCENTRATOR <br /> <br />REJECTS <br /> <br />REJECT <br /> <br />MAKE-UP <br />TREATMENT <br /> <br /> <br />BRINE EVAPORATION POND <br /> <br />Fig. 6 WET COOLING TOWER <br />BRINE CONCENTRATION OPTIONS <br /> <br />IV-18 <br />