Purification Process (Water) The sequence of steps taken, beginning with unpurified water, which results in purified water delivered through a water system to the ultimate consumer. This sequence would normally include most or all of the following: 1 Begin with unpurified water, 2 Screening – removal of leaves, sticks and large foreign material, 3 Pre-Chlorination – removal of disease organisms, bad taste, and odors, 4 Pre-Settling – settling out large dirt particles, 5 Flash Mix – a process in which chemicals are added to cause fine dirt to clump together, 6 Coagulation/Flocculation – a process in which flash mix particles are gathered and made even larger, 7 Sedimentation – a process in which gravity is used to settle out the large particles formed in coagulation/flocculation, 8 Filtration – removal of any remaining particles, water is at least 99 percent particle-free at this point in the process, 9 Final Chlorination – removal of any remaining disease organisms and adds necessary chlorine to prevent microbe regrowth in the distribution system, 10 Corrosion Control – a step in which chemicals are added to neutralize the corrosive effects of “soft” water systems, thereby preventing damage to plumbing and fixtures, 11 Finally, effluent pumps send the purified water to residential, commercial, and industrial establishments.
Source: http://www.bvsde.paho.org/bvsacg/i/fulltext/dicciona/dicciona.pdf
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Author of the Water Words Dictionary source of text: Gary A. Horton
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