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<br />t,) Plant Features <br />o <br />~ . Product water is collected from each stage individually and combined with <br />e.o untreated drainage water in a concrete channel and conveyed to the Colorado River. <br />The process recovers 70 percent of the feed water with the remaining 30 percent <br />being discharged as a brine, The rejected brine flows to an energy recovery <br />system, with hydraulic pelton wheels directly coupled to three high-pressure feed <br />pumps and motors. This system will save approximately 24 million kilowatt-hours <br />per year-approximately 16 percent of the pumping power required for desalting, <br />From there the concentrate water is piped to the concrete-lined bypass drain where <br />it is combined with excess untreated Wellton-Mohawk drainage and then flows <br />through Mexico to the Santa Clara Slough at the Gulf of Califomia. <br /> <br />Office and control room areas are located in the two-story section of the desalting <br />building. Special areas are provided for electronic and computer equipment, as well <br />as control room and associated operator areas. <br /> <br />A subject of special concern is the no-load condition which is expected to result <br />from high riverflow conditions. Operation of the plant will be dependent upon the <br />hydrology of the Colorado River. There are expected periods of time when it will <br />be unnecessary to operate the plant or periods when the plant may be operated at <br />reduced capacity. During outages the membranes will be cooled with chilled water <br />containing a biocide. <br /> <br />Test Plant, a Research & Development Facility <br /> <br />A small but important feature of the plant is the Test Plant. This test system affords <br />potential for advancements in both pretreatment and desalting technology, plus the <br />ability to maintain a program of continuous technology assessment for operations <br />and equipment replacement. The Test Plant also provides,a vehic1e, for operator <br />training. <br /> <br />The l-million-gallons-per-day pretreatment system has one SCR and a 4-cell dual <br />media filter system. The Test Plant desalting building houses Test Desalting Units <br />as well as providing space for future test writs. Extensive testing at the Test Plant <br />pretreatment systems will,dellelop: <br /> <br />. operating standards for equipment, <br /> <br />. operating limits. <br /> <br />These initial tests have been utilized to optimize: <br /> <br />. the solid contact reactor lime slurry and ferric sulfate dosage rates, <br /> <br />. sludge distribution in the mixing zone, <br /> <br />4 <br />