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<br /> <br />1?Q@Qif{):J@Cf)c::;7 <br /> <br />,Theclear water above this sediment is skimmed olf the lOp and then filtered through layers of activated <br />charcoal, sand, gravel and rocks to remove any remaining impuflties. One final step, chlorination, adds very <br />small amounts of a chlorine gas solution 10 kill any bacteria which may still remain in the wafer. The four <br />experiments below duplicate the lour basic steps of water treatment. Mix 112 cup of mud or dirt with 2 <br />quarts at water in a one-half gallon container until the water appears dirty. Pour the waler Into 2 one-Quart <br />jars, leaving aboul3 inches 01 space allhe top of each jar. Now proceed 10 the first process, aeration. <br /> <br />~FILTRATION <br /> <br />, <br /> <br />~<:7{7v<:7 <br /> <br /> <br />.f CI-lLORINATION <br />FILTERED <br />{WATER STORAGE <br /> <br />t1 <br /> <br />SEDIMENTATION <br /> <br />~~~~~~V'o~ <br /> <br />~ <br /> <br />~ <br /> <br />Allow the floc to settle and observe every five <br />mmutes How long did It take before the <br />floc had sell led 10 the boltom? <br /> <br />c3 <br />it. ' <br />1>.. ~ . <br />.. z:;?- <br /> <br />90% of the floc should settle out in 10-15 minutes. <br /> <br /> <br />- PEBBLES <br /> <br />.-- WIR.E. SCR.EEN <br /> <br />~,o <br />8 <br /> <br />027 <br /> <br />FILTRATION <br /> <br />Cut tile bol1om oul of a one Quart plastiC bailie. Invert the bailie <br />and pul a piece of wire screen on the bottom, inSide the neck. <br />Place layers of clean filtering maTerial as mdlcated In tile <br />draWing Run some tap waler through the filter 10 make sure thaI <br />the filter IS clean Slowly pour off half oflhe water from the <br />sedimentation lar into the filter bottle Compare lhe resul!mg <br />filtered water With the Quart 01 muddy water, and with fhe <br />remaining floc water. Describe the differences in appearance <br /> <br />Someserrlmg will have taJ..en place in the muddy warer. depending on the <br />lengrh of time since the dirt was put into solution. The floe warer will <br />appear quire clear, but sediment wilf be v'slb/eon the bottom of the <br />lar, The filtered water will have Virtually no sediment or noticeable <br />piJrticles in the warer. <br /> <br />-17- <br />