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Water Treatment

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Question
Answer
Name all five water treatment methods.   Screening, Settling, Filtration, Chlorination, Fluoridation.  
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What happens during the process of screening?   Water is run through screens/wire mesh to remove large debris, e.g. leaves and rubbish.  
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What happens during the process of settling?   Aluminium sulphate is added to the water, this causes small insoluble debris to clump together and settle in the bottom of the tank.  
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What happens during the process of filtration?   Water is filtered through beds of sand and all remaining debris removed.  
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What happens during the process of chlorination?   Chlorine is added to the water to kill bacteria and micro-organisms,amount of chlorine added is closely monitored.  
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What happens during the process of fluoridation?   Fluorine is added to water in some countries to help prevent tooth decay.  
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