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<br />OOJ3I4 <br /> <br />methods to desalinate and purify water in use around the globe reverse osmosis is <br />one of the most effective, removing not only salt ions, but bacteria and viruses as <br />well. In the United States RO is presently in widest use in Florida which has well <br />over one hundred RO plants in operation serving customers ranging in size from <br />high rise towers to communities as large as Jupiter and Cape Coral, Florida. <br /> <br />Traditionally RO plants are used to produce potable water. The YDP is <br />not authorized or equipped for this use. Instead the YDP is authorized and <br />equipped to recover (desalinate) a portion ofthe bypass flow from the WMIDD. <br />This flow is transported to the YDP via the MODE, an open conveyance channel. <br />Desalinated product water from the Plant is mixed with some untreated water <br />from the MODE and the resulting blend is sent to the Colorado River for <br />inclusion in water deliveries to Mexico. The concentrated salt stream or reject <br />stream resulting from water desalination is mixed with other remaining flows in <br />the MODE and conveyed to the Cienega. <br /> <br />The YDP was constructed as three units and therefore can be run at 1/3, <br />2/3, or full capacity. The process recovery factor is a function of membrane <br />efficiency and is estimated to be between 73%-85%. Maintenance schedules will <br />require units to be shut down periodically limiting output to from 75% - 80% of <br />maximum under full operation conditions. <br /> <br />Since the YDP is a process plant, the quantity and salinity ofthe product <br />water and reject stream can be made to vary over a broad range. Table 1 below <br />illustrates some ofthe production range of the YDP, using average annual flows <br />from 2004 as an illustration. This data also demonstrates the salinity of the flow <br />that is sent to the Cienega is different than that ofthe YDP's reject stream. A <br />common misperception is that these flows are synonymous. <br /> <br /> Table 1 <br /> One third Two thirds <br /> YDP not capacity capacity Full capacity <br /> operating operation operation opreation <br />Product water exiting the YDP <br />Quantity (ac-ft) 23,438 42,392 64,598 <br />Salinity (ppm) 122 148 160 <br />Reject stream from the YDP <br />Quantity (ac-ft) 8,669 15,679 23,892 <br />Salinity (ppm) 7,818 7,747 7,715 <br />Water sent to the Colorado River <br />Quantity (ac-ft) 26,868 48,408 74,557 <br />Salinity (ppm) 451 465 499 <br />Flow to the Cienega at the international border <br />Quantity (ac-ft) 109,100 82,232 60,692 35,543 <br />Salinity (ppm) 2,820 3,347 4,093 6,206 <br /> <br />Recommendations of the YDP/Cienega Workgroup <br /> <br />7 <br />