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<br />to a disposal site made up of evaporation ponds located <br />about 22 miles southeast of the desalting plant. <br /> <br />Each acre-sized evaporation pond will be fIlled with <br />sludge. When the sludge dries, the ponds are covered over <br />with soil to blend into the desert landscape. This <br />underground sludge will eventually become a limestone <br />deposit. <br /> <br />Some companies have approached the Bureau of <br />Reclamation to buy the sludge (which is made up mainly <br />of calcium carbonate). The companies could use the <br />sludge for a couple of purposes. It could be used in <br />scrubbers on air pollution control systems, and it could <br />also be recycled and the chemicals in the sludge could be <br />used for soil treatment on farmlands. <br /> <br />At the solids contact reactors, while the sludge goes out <br />through the bottom, the clarified water rises to the top of <br />the 3 reactors and is collected by pipes (or launders) <br />located near the top, and flows by gravity out of the <br />reactors to the dual media gravity filters. <br /> <br />Before the water reaches the filters, sulfuric acid is added <br />from the sulfuric acid storage area to reduce the pH of the <br />water from 10 to 7.5. The sulfuric acid also prevents <br />calcium carbonate scale buildup which would plug and <br />cake the sand and anthracite coal in the dual media gravity <br />filters. <br /> <br />c:\Cl8at8d\Sa1pta\m0d8l.chp (model.sty) 4 <br />