Necessity of water treatment
|Composition of water |
When we open the tap, clean tasty water flows out. Water undergoes several purification steps before it flows from taps.
Water that is used for drinking water production contains water molecules and a large variety of other substances. One of the properties of water is that it easily dissolves other susbtances. Water that falls to earth during rain showers dissolves substances, particles and gasses such as oxygen, which can be found in air. Contaminants that are present in air also dissolve in rain water. When surface water flows on earth it also dissolves several different substances, such as sand particles, organic matter, microorganismss and minerals. Water that settles into the ground and becomes groundwater often contains large amounts of dissolved minerals, as a result of contact with soils and rocks. Human activities, such as agriculture and industrial waste and sewer water discharge cause a number of pollutants to enter the water.
Self-cleansing capacity of water
More information on water disinfection?:
What is water disinfection? Necessity of drinking water disinfection History of water disinfection Waterborne diseases Factors that influence disinfection Conditions of water disinfection Regulation drinking water disinfection EU USA