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This program traces the water cycle, beginning with the collection of rainwater in rivers and lakes, in great detail through a water treatment plant, to some of the places where water is used, and finally back into the atmosphere. Treatment of the water begins with the use of chlorine to destroy organisms; the water is then filtered through various sedimentation tanks to remove solid matter. Other treatments employ ozone, which oxidizes everything and makes it easier to remove; hydrated lime, which reduces the acidity of the water; sulfur dioxide, which removes any excess chlorine; and flocculation, a process in which aluminum sulfate causes small particles to clump together and precipitate out. Throughout various stages of purification, the water is continuously tested by smell, taste, titration, and by fish. The treatment plant also monitors less common contaminants with the use of up-to-date techniques like flame spectrometers and gas liquification. (20 minutes)



 
                

Item#: This title is currently not available.
Copyright date: ©1987



Part of the Series : Chemistry in Action
     


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Acid Rain
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An explanation of the history of acid rain and the dangers posed by industrial carbon and sulfur emanations that interact with airborne moisture to produce acid rain, the program provides chemical definitions, illustrates geological and meteorologica...(more details)
 
Iron and Steel
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Iron ore is reduced and manufactured into steel in a modern plant where, in a continuous process, ore is crushed and mixed with coke and then fed into the top of a blast furnace. Molten iron flows off from the bottom; slag is skimmed off; and iron is...(more details)
 
Polyethylene
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Polyethylene is one of many commercially important organic compounds derived from crude oil. This program demonstrates the polymerization of ethylene at different pressures and in the presence of different catalysts, depending on the intended end use...(more details)
 
Aluminum
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Aluminum is extracted and purified from clays and rocks at a British plant by purifying bauxite ore to aluminum oxide and reducing this oxide to molten metal. The influence of economic factors is seen in the location of aluminum plants, which consume...(more details)
 
Out of the Air: 1
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Air, an important industrial raw material, is first filtered to remove any solid matter. Then its constituent gases-nitrogen, oxygen, and other trace gases-can be separated by compressing the air, cooling it, and then allowing it to expand, which coo...(more details)
 


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