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<br /> <br />c:!36Jv@(jJ <br /> <br />Q <br /> <br /> <br /> <br />In order to have safe and pure drinking water, lhe local water supply must go <br />through several steps in a treatment process, First is AERATION In which <br />water is sprayed into the air to release any trapped gases and absorb <br />additional oxygen for belter taste, To remove any possible dirt in the water, <br />three more steps are necessary. COAGULATION, SEDl MENTATION and <br />FIL TAATION. Alum, or aluminum sulfate, is added to the water which breaks <br />down into tiny. sticky particles called "f1oc", The dirt then coagulates with <br />the floc and begins to settle to the ballam as the particles become heavier, <br />ALUM <br />tC <br /> <br />4"COII.6ULATlON <br /> <br />,1'(1 <br />. <br />" <br /> <br /> <br />l:J (;7.() <br />t:) 0 rJ <br /> <br />'0 <br /> <br />Q <br /> <br />~ <br /> <br />RESERVOIR. <br /> <br />~AERATlON <br /> <br /> <br />/:'" E F~f':~',:T' i ()l\l <br /> <br /> <br />Place a lid on lop 01 one of the Jars and shake it for <br />10 seconds, Next pour the water back and forth <br />into another container, How does this action allow <br />the trapped gases to escape and new oxygen to be <br />added to the water? <br /> <br />Dissolve 10 alum crystals in 1 tablespoon of warm <br />water in a cup, Grind the crystals while mixing <br />them into solution, Pour the contents of the cup <br />into the jar of aerated water, rinse the cup and add <br />this water 10 the jar, Slowly stir lor fjve minutes <br />and observe the formation of "floc", How rapidly <br />did the floc begin to form? <br /> <br />Ib <br />