Water Purification
Suspended and dissolved impurities present in naturally
occurring water make it unsuitable for many purposes.
Objectionable organic and inorganic materials are removed by such
methods as screening and sedimentation to eliminate suspended
materials; treatment with
such compounds as activated
carbon to remove tastes and odours; filtration; and chlorination
or irradiation to kill infective micro-organisms. See also Sewage
Disposal. In aeration, or the saturation of water with air, water
is brought into contact with air in such a manner as to produce
maximum diffusion, usually by spraying water into the air in
fountains.
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