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<br />c. Yuma Desalting Test Facility
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<br />In 1974, desalting membrane manufacturers were invited to bring test units
<br />to the facil ity at no cost to the Government. The Government was to provide,
<br />acceptable pretreated drainwater, since raw drainwater is not suitable for
<br />use directly in desalting equipment, Initially, seven manufacturers
<br />responded. Other manufacturers later expressed interest, and two,were put
<br />on line in late 1975. All testing of these units was terminated in
<br />May 1978 after equipment selection was made,
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<br />Major ,objectives of the test program are:
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<br />1:. To provide the Bureau of Reclamation and desalting equipment
<br />~anufacturers data on desalting modules and equipment operating on
<br />pretreated drainwater,
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<br />~. ,To allow desalting equipment manufacturers to gain confidence in
<br />their equipment for operating on the pretreated water.
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<br />3., To provide, in part, information for evaluation of desalting
<br />aquipment proposed for the Yuma Desalting Plant.
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<br />4. To test pretreatment systems and to optimize pretreatment system
<br />pa rameters.
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<br />The ov~rriding constraint on the testing was that it was for the benefit of
<br />the Yuma Desalting Plant and, thus, units which are clearly inappropriate
<br />were not tested, Since termination of the membrane unit testing, efforts
<br />at the'test facility have centered on obtaining final design data for the
<br />pretre~tment system, This work is scheduled to be completed just prior to
<br />initiation of proof testing on the selected desalting units. This test
<br />of 6 m9nth's duration is to demonstrate, using equipment the same as that
<br />offered, the performance characteristics proposed by the manufacturer,
<br />All work is programed to be completed by early 1980.
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<br />Optimization (Preliminary Engineering Report)
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<br />It is Intended that the desalting plant operate as near optimum as possible, 1
<br />under systematic regulation of the variables affecting such operation,
<br />Economic considerations and, in this case, the associated legal commitments,
<br />serve as a basis for plant optimization,
<br />
<br />In the "Preliminary Engineering Analysis," by Burns and Roe, Inc., under
<br />contract to, the Office of Water Research and Technology, a base case
<br />design.was developed for a plant split among electrodialysis, hollow fine
<br />fiber ~everse osmosis, and spiral wound reverse osmosis processes, This
<br />"P1ant:sp1it" served to: (1) establish guidelines for the development of
<br />bid paqkages; (2) provide a basis for evaluation of those bids; (3) identify
<br />relationships among the different processes; (4) establish a technically
<br />feasib1,e plant design that would accommodate the required detail of each
<br />possibl:e offering: and (5) provide the maximum amount of information on the
<br />design 'of large membrane plants.
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<br />The OPtimization determined the membrane life, or replacement period, which
<br />resulted in the lowest salt removal cost, The parameters considered were
<br />pumpinQ cost, membrane ownership cost, mechanical equipment ownership cost,
<br />plant structures ownership cost, pretreatment cost, operation and mainte- '
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