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<br />. ,':} <br /> <br />j' <br />:1: <br /> <br />.t <br />~" <br />~j <br /> <br />w <br />en <br />I-' <br />(j) <br /> <br />Th~ cost of this power is projected at $3,137,000 per year during 1983 <br />and 1984 and $3,543,000 per year for the remainder of the Project life. <br /> <br /> <br />;i'>' <br />'1: <br />, <br />;"1 <br /> <br />:,\ <br /> <br />Alternate sources of power are several thermal powerplants that are pres- <br />ently under construction and expected to be in service by 1985. <br /> <br />, <br />"{ <br /> <br />'~t <br />, <br /> <br />The annual cost of power from an alternate source is estimated to be' <br />$5~660,000 per year. <br /> <br />., <br /> <br />H. Oescription of.Desalting Plant <br /> <br />The desalting plant will have an installed capacity of 95.7 Mgal/d and, <br />with a plant factor of 84.5 percent, will produce 90,570 acre-feet'of <br />product water per year. In combination with additional MODE flow Which <br />wilil be combined with this product, there will be a yield of 120,360 aCre- <br />fee~ of blended water while the plant is operating normally. Figure 3 <br />is an artist's concept of the plant. <br /> <br />The actual desalting plant will be divided into two distinct systems, the <br />pre~reatment system and the membrane desalting system, and the description <br />of 'each system's equipment is given in order of the flow through that sys- <br />tem'; Figure 3 is an artist's concept of the plant and Figure 4 is the <br />sit!'! plan. <br /> <br />Flow to the pretreatment facilities will pass through a diversion struc- <br />tur'e in the MODE. The diversion structure will include a vertical bar <br />trashrack followed by a constant head orifice turnout, <br /> <br />Fro~ the constant head orifice turnout, the flow to the plant will pass <br />thrbugh four parallel concrete pipes to four grit sedimentation ba~ins and <br />a set of traveling screens to a common sump, <br />, <br />The: intake pumping system will pump the water to four. solids contact reactorlii" <br />whi~h will operate in parallel. <br /> <br />/t <br /> <br />., <br /> <br />,~: <br /> <br />Lim~, in the form of calcium hydroxide (Ca(OH)2) slurry, will be pumped <br />to the solids contact reactors. Ferric sulfate and a polyelectrolyte will <br />als~ be pumped to the solids contact reactors. Each reactor will have <br />indffvidual chemical feed systems, piping systems, and controls so that <br />onelunit can be shut down for maintenance and started up without ihterfer- <br />ing with the operation of the other three units. <br /> <br />". <br />, <br /> <br />,'" ',J: <br />, <br />-:~ <br />,f' <br /> <br />;1 <br />4 <br /> <br />Within the solids contact reactors, rotating mechanical scrapers will move <br />the. sludge to a sump from which part will be recycled and the remainder <br />removed to the thickeners. This sludge will be recalcined or disposed of <br />off site, <br /> <br />, d~ <br /><1, <br /> <br />,'" <br /> <br />Fro~ the reactor, the water will overflow to the gravity filters. Between <br />the'launder and the gravity filters, the pH of the water will be adjusted to <br />8,0 by the addition of carbon dioxide (C02) gas or sulfuric acid. <br /> <br />, <br />'I <br /> <br />.';, "~ ., -:-.'0' ~ <br /> <br /> <br />17 <br /> <br />. ...'''-~ <br />