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<br />.,1 <br /> <br />The water in the drain turns into the plant at the intake <br />system. Here, screens remove algae from the water and <br />also remove large debris such as tree branches from the <br />water as it flows by gravity into the plant. On its way into <br />the plant, the water is chlorinated (or treated with chlorine) <br />to kill micro-organisms and to stop the growth of algae, <br />which would plug or damage the plant's filters and <br />membranes. <br /> <br />The water arrives first at the plant's grit sedimentation <br />basins. Here the rapidly flowing water slows down and <br />spreads out so that gravity causes the sediment to fall to <br />the bottom. At the bottom of the basins the sediment <br />buildup is scraped to the side. <br /> <br />Then the sediment is pumped out to the sludge handling <br />area to remove most of the water from the sediment and <br />then eventually dispose of the sediment. <br /> <br />At the grit sedimentation basins, as the sediment falls to <br />the bottom, the partially cleaned water near the top flows <br />over the basin walls and into the small intake pumping <br />plant. Here, intake pumps lift the water up into the three <br />large solids contact reactors. <br /> <br />In the center of the reactors, lime and ferric sulfate are <br />added to the water in the reactors. The lime removes part <br />of the calcium hardness of the water that would cause a <br />scale buildup and eventually plug the desalting membranes <br />when the water reaches them further along in the desalting <br /> <br />C:lpea18d\Oa1p1B\/nodel.chp (model.1IIy) 2 <br />