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<br />Title I Program <br />Colorado River Basin Salinity Control Act <br /> <br />being investigated, New and innovative <br />techniques are being developed to remove <br />grit, clays, colloids, and scaling constituents <br />from the feed water. As promising <br />techniques are developed, pilot studies will <br />be conducted to determine if these new <br />techniques will reduce costs. <br /> <br />Desalted Water Marketing <br /> <br />The city of Yuma has investigated <br />purchasing water treated by the YDP <br />(desalted irrigation drainage and/or <br />Colorado River water treated by the <br />pretreatment system only) to help meet its <br />increasing need for potable water, Joint <br />technical evaluations by Reclamation and <br />the city have been completed, but the city <br />has decided to meet short-term needs by <br />expanding its own water treatment <br />facilities. In the future, however, the city <br />will pursue purchasing YDP-treated water, <br />Discussions with Reclamation are <br />continuing, <br /> <br />IT the city purchases YDP-treated water in <br />the future, it could avoid the high cost of <br />expanding its own water treatment <br />facilities, and the United States could <br />benefit by cost-sharing YDP operation and <br />maintenance costs, The salinity and the <br />quantity of the water delivered to Mexico <br />would not be affected by such an agreement, <br /> <br />Sludge Marketing <br /> <br />Reclamation is investigating the possibility <br />of marketing YDP waste calcium carbonate <br />sludge. However, even if the sludge were <br />given away, up to $2,7 million in disposal <br />costs could be saved per year. <br /> <br />New Membrane Technologies <br /> <br />Investigation of lower pressure and higher <br />recovery membranes is planned. As new <br /> <br />24 <br /> <br />membranes are developed, Reclamation will <br />determine if the membranes are suitable for <br />the YDP. Low-pressure membranes, <br />although more expensive, could reduce <br />electrical power requirements from 22 to <br />15 megawatts for an annual cost savings of <br />about $1.5 million. These membranes may <br />also increase recovery of irrigation drainage, <br />thereby reducing the volume of the reject <br />stream, However, changes in pretreatment <br />would be required to allow use of low- <br />pressure membranes and to substantially <br />increase recovery, which may offset overall <br />cost savings. <br /> <br />Technical Review <br /> <br />Reclamation plans to develop a board of <br />consultants, or technical review committee, <br />to review and recommend improvements to <br />the YDP and its operations. The committee, <br />expected to consist of experts from the <br />desalting industry (public and private), <br />academia, and others, will review all aspects <br />of the YDP and recommend modifications to <br />increase efficiencies, reduce costs, and <br />improve the overall operation of the YDP, <br />Test Plant (formally called the Test Train), <br />and cost reduction program, <br /> <br />Recalclnlng and Cogeneration <br /> <br />Recalcining is a technique to recycle the <br />waste calcium carbonate sludge that forms <br />in the pretreatment system, The present <br />design provides for all of the sludge to be <br />piped to disposal ponds, <br /> <br />In recalcining, the sludge would be heated <br />in a kiln to produce calcium oxide (lime), <br />which would be reused in the pretreatment <br />system, Therefore, the amount of new <br />chemicals required and the amount of <br />sludge that must be disposed of would be <br />greatly reduced. Reclamation will <br />investigate the compatibility of recycled <br />lime with the pretreatment system, <br />