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<br />. <br /> <br />002543 <br /> <br />. <br /> <br />development, were not included. <br /> <br /> <br />The study was conducted for the purpose of examining the <br /> <br /> <br />technical and economic feasibility of applying desalting technology <br /> <br /> <br />to the problem of improving the municipal water supplies of the <br /> <br /> <br />selected communities. Specific recommendations as to types of treat- <br /> <br />ment plants, including location and brine disposal, were to be <br /> <br />included in the recommendations. Economic feasibility was an inte- <br /> <br /> <br />gral part of the study. <br /> <br /> <br />A number of desalting techniques are known to be tech- <br /> <br /> <br />nically feasible. For the purposes of the study, the desalting <br /> <br /> <br />techniques examined in most detail were electrodialysis, reverse <br /> <br />osmosis and vacuum-freezing vapor-compression. Distillation proc- <br /> <br />esses were not examined in depth since they are not economical for <br /> <br /> <br />systems with small plant capacities. In order to meet the objective <br /> <br /> <br />of determining the best desalting technique for use of each community, <br /> <br /> <br />it was necessary to evaluate a number of different candidate desalt- <br /> <br />ing systems. The various systems were analyzed to verify the tech- <br /> <br />nical feasibility of their use and to establish which system would <br /> <br />result in the lowest cost for the product water in each city. Sys- <br /> <br />tem costs for the various techniques were derived from a manual on <br /> <br />cost calculating procedures published by the Office of Saline Water. <br /> <br />All of the selected cities have high calcium and sulfate <br /> <br />~- <br />