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[1 <br />brought in by rail tank car or by tanker trucks. In later phases, coal brought in by rail, may be <br />considered as a fuel. <br />For large seawater conversion plants, it is both feasible and economical to build "dual purpose" <br />plants. The seawater conversion process normally used is distillation, utilizing low pressure <br />steam (waste heat) from the associated thermal power plant, but steam could also be used in <br />steam turbines driving the high pressure pumps in an RO system. <br />In recent years, "triple purpose" plants, encompassing electric power generation, seawater <br />distillation and seawater reverse osmosis have been evaluated and are thought to be more <br />economical than dual purpose plants. This combination of desalination techniques and <br />electric power generation should be evaluated further in a detailed feasibility study, as previous <br />studies have shown that the energy requirement in such "triple" purpose plants could be <br />reduced to as little as about 0.25 to 0.30 mw /mgd under the most favorable conditions. <br />4 7.0 PROJECT COST <br />j The cost of the proposed projects to be constructed in Mexico are estimated on the basis that <br />the same environmental protection requirements utilized for the U.S. will be utilized for Mexico. <br />The project cost for an initial seawater desalting plant capacity increment of 30,000 ac -ft <br />2 (36 x 106 M3) per year, including a pipeline to Mexicali, is estimated to be in the range of U.S. <br />Dollars 500 to 700 million. On the other hand, a brackish water reverse osmosis plant of equal <br />capacity could probably be built for a cost in the range of U.S. Dollars 350 to 400 million. See <br />Tables 6 and 7. <br />1 12 Carollo Black & Veatch <br />