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Waterworks



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WATER WORKS 9 12 OBJECTIVES SUBJECTS Science Physical Earth Biology The student will do the following 1 Describe the process that water treatment plants use to purify water for drinking 2 Demonstrate how a water treatment plant works BACKGROUND INFORMATION Our drinking water comes from both surface water and groundwater Water in lakes rivers and swamps contains impurities that may make it look and smell bad Water that looks clean may contain harmful chemicals or bacteria and other organisms that can cause disease Waterborne diseases have been and continue to be a major public health concern Waterborne disease outbreaks such as occurred in Milwaukee WI in 1993 with 400 000 sick and over 100 deaths give cause for continued vigilance in drinking water protection and treatment TIME 2 class periods MATERIALS student sheets 2 gallon 8 L jug of water 5 cups 600 ml soil or mud acetate sheet many 2 liter plastic bottles funnels scissors stirring rods alum bleach fine sand coarse sand fine gravel coarse gravel activated charcoal cotton for plugs tap water tablespoons clock small piece of cheese cloth rubber band It takes the efforts of federal state and local governments as well as local water suppliers to keep our drinking water safe The Safe Drinking Water Act and its amendments set the standards for public drinking water supplies The Environmental Protection Agency is charged with ensuring that these standards are met Technicians working in drinking water facility laboratories conduct thousands of tests each year to ensure that our drinking water supply is free of disease causing bacteria and other pathogens These test results are reported to state and local governments Drinking water treatment plants clean and maintain the quality of our water supplies through the following processes 1 aeration 2 coagulation flocculation 3 sedimentation 4 filtration and 5 disinfection See definitions in Terms Terms 2 1 aeration exposing to circulating air addition of oxygen to wastewater



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