Municipal Water Treatment Plants
Threats to our drinking water are increasing due to our aging water system infrastructure and increased pollutants
invading our water sources. We can no longer take the safety of our drinking water for granted. Some of the more
common natural sources of pollution include:
microorganisms; underlying rock; nitrates and nitrites. Human Activities causing pollution include: bacteria and
nitrates from human and animal wastes, septic tanks and large farms; household wastes such as cleaning solvents, used
motor oil, paint, paint thinner, and pharmaceuticals. Most of us are familiar with problems caused by E. coli in
the water
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Pollutants in Water
Many other chemicals are added to our tap water before we drink it, which at the very least will include fluoride.
Most drinking water comes from three sources.
Ground water - which is heavily saturated with suspended matter and dissolved acids (which give it the brown
colour). To clear this water, aluminium sulphate (alum) is added as a coagulant and then chemical polyelectrolytes are
added to further settle the coagulated wastes. This water is then passed through sand filters to remove the settled
particles. Some of the chemicals remain in the water.
Surface dam water - to which
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