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WSP07913
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Last modified
1/26/2010 2:29:24 PM
Creation date
10/12/2006 2:40:15 AM
Metadata
Fields
Template:
Water Supply Protection
File Number
8277.400.200
Description
Lower Virgin River Project
State
NV
Basin
Colorado Mainstem
Date
11/1/1986
Title
Study of Saline Water Use at the Harry Allen Generating Station - Final Report - November 1986
Water Supply Pro - Doc Type
Report/Study
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<br />'~ <br /> <br />I' <br /> <br />o <br />-:j" <br />":r' <br />N <br /> <br />':. <br /> <br />;i.::': <br /> <br />Electric Company (PG&E) and the Los Angeles Department of Water Power (LADWP), <br />and the Electric Power Research Institute (EPRI). The test appl led a process <br />sequence, Including Ion exchange softening, to the treatment of Irrigation <br />water from the San Joaquin Valley In California for power plant cocllng. This <br />process sequence involved Ion exchange softening of cooling tower makeup, <br />cocling tower operation at 20 cycles of concentration, sldestream silica con- <br />trol with alum dosing, and regeneration of the ion exchange softener resin <br />with the 20-fold concentrate. <br /> <br />'-, <br /> <br />The results of the tests concluded that the process sequence was technically <br />viable. Because of the limited scope of the Firebaugh test plan, additional <br />testing was recommended to confirm performance and to demonstrate economic <br />vlabi I Ity. <br /> <br />The Los Banos test involves the appl icatlon of Ion exchange softening as a <br />pretreatment system for a reverse osmosis desalting. In addition, waste brine <br />is concentrated In an evaporator. The Los Banos system utilizes water from <br />the San Luis Drain which Is primarily Irrigation water with a salinity of ap- <br />proximately 9,000 mg/I. The Ion exchange pilot plant system has been operat- <br />Ing satisfactorily after hardware problems In the early phase of operation <br />were resolved. By coincidence, the feedwater to the Los Banos test unit <br />closely parallels the LaVerkln Springs feedwater. For this reason It Is ex- <br />pected ion exchange performance at Los Banos should approximate that at <br />LaVerkln Springs. The similarity of the feedwaters prompted CH2M Hili to use <br />performance data from LaVerkln Springs to project Ion exchange performance as <br />reverse osmosis pretreatment on the San Luis Drain water. This study indi- <br />cated a favorable cost advantage of Ion exchange softening over lime-soda sof- <br />tening as pretreatment. <br /> <br />The Etlwanda field test program Is evaluating the Ion exchange softening <br />process under actual plant operating conditions with a variety of feedwater <br />chemistries. The results of the field test program wil I be compared with <br />laboratory test results and other field test programs to determine the ac- <br />curacy of projected resin performance and regeneration efficiency. <br /> <br />Ion exchange (zeolite) softening Is a long established technique for removing <br />hardness (calcium and magnesium) from water. Historically, applications have <br />ranged from home water softeners to Industrial boiler makeup and smal I <br />municipal treatment plants. As a pretreatment method for circulating water <br />system makeup, the ion exchange reaction Is a proven technology. Histori- <br />cally, the volume of salt (NaCI) required and the corresponding volume of <br />regenerant waste produced have precluded Ion exchange softening from being ap- <br />pi led to large volume flows. Modifications to the conventional sodium cycle <br />Ion exchange process have been developed and tested by the Bureau of Reclama- <br />tion and others. These modifications have focused on utilizing reject desalt- <br />Ingbrlne or cocl Ing tower blowdown to regenerate the resin bed. Since these <br />streams already exist, their cost and waste volume Impact on the plant are <br />much less than for a conventional sodium chloride brine regenerated system. <br />These waste streams provide the sodium for regeneration as sodium sulfate <br />rather than the traditional sodium chloride. The waste streams also contain a <br />high concentration of other Ions along with significant levels of suspended <br />sol ids. Tests to date have shown the other ions to have minimal effect on the <br /> <br />,i <br /> <br />" <br /> <br />, <br /> <br />,.' <br /> <br />4-2 <br /> <br />> <br /> <br />~~, <br />
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