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<br />I <br /> <br />c;;?Q@Q7?{X)@tAfJv <br /> <br />The clear water above this sediment is skimmed off the top and then filtered through layers of activated <br />charcoal, sand, gravel and rocks to remove any remaining impurities, One final step, chlorination, adds very <br />small amounts of a chlorine gas solution to kill any bacteria which may still remain in the water, The four <br />experiments below duplicate the four basic steps of water treatment. Mix 1/2 cup of mud or dirt with 2 <br />quarts of water in a one-half gallon container until the waler appears dirty, Pour the water into 2 one-Quart <br />jars. leaving about 3 inches of space at the lop of each jar. Now proceed to the first process, aeration, <br /> <br />.;- FILTRATION <br /> <br />- <br /> <br /><}QVQ <br /> <br />of O-lLORINATION <br />FILTERED <br />{WATER STORAGE <br /> <br />~ <br /> <br />" <br /> <br />C SEDIMENTATION <br /> <br /> <br />',- , <br /> <br />',:,." <br />..,." , <br /> <br /> <br />~~~~'U'o~ <br /> <br />5J <br /> <br />- <br /> <br /> <br />ll'. ' <br />0"". <br />~'Z;2' <br /> <br />AllOw the floc to settle and observe every live <br />minutes, How long did It lake before the <br />floc had settled to the boll om? <br /> <br /> <br />FILTRATION <br /> <br />-PEBBL~S <br /> <br />Cut the bottom out of a one quart plastic bottle, Invert the bottle <br />and put a piece of wire screen on the bottom, inside the neck, <br />Place layers of clean filtering material as indicated in the <br />drawing, Run some tap water through the filter 10 make sure that <br />the liller is clean, Slowly pour off hall 01 the waler from the <br />sedimentation jar into the filter bottle, Compare the resulting <br />filtered waler with the quart of muddy waler, and with the <br />remaining floc water, Describe the differences in appearance, <br /> <br />__ WIRe SC.R.E~N <br /> <br />%" <br />8 <br /> <br />0-2 <br /> <br />'1 <br />