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<br />process. The ferric sulfate aids in settling the sludge and <br />also helps to remove most of the small suspended solids <br />still in the water. <br /> <br />The lime and ferric sulfate are stored in silos until <br />needed-pebble sized quicklime in 4 large silos and ferric <br />sulfate in two smaller silos. <br /> <br />The quicklime is blown from the bottom of the silos to the <br />lime slaker building where the quicklime is mixed with <br />water to form a lime slurry which means water thick with <br />lime, about the consistency of cream. This lime slurry is <br />then pumped from the slaker building to the solids contact <br />reactors where it's mixed with the water. <br /> <br />The dry ferric sulfate is also mixed with water to form a <br />solution and is also injected into the water in the solids <br />contact reactors. <br /> <br />As the lime slurry comes into contact with the calcium and <br />suspended solids in the water, it chemically reacts by <br />bonding to the solids, forming sludge, which becomes <br />heavy enough so that it settles to the bottom of the solids <br />contact reactors. <br /> <br />The excess sludge is then scraped to the center of the <br />reactors and is then transferred to the sludge thickener, <br />which concentrates it into an even thicker sludge. <br />Pumps move this thickened sludge (which is now waste) <br />from the sludge thickener through an underground pipeline <br /> <br />C:\CI1I8I8d\OCrip1S\r11DCl8I.cI1p (modeI.oty) 3 <br />