chlorination and dechlorination. » what is the purpose of a water treatment plant? ˃to remove all...
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Operation Water
BiologyChlorination and Dechlorination
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Treatment plant» What is the purpose of a water treatment plant?
˃ To remove all contaminants and make the water safe to drink
» What should be removed?˃ Bacteria, ammonia, phosphorus, nitrogen, dissolved organic material,
iron, arsenic, and more….
» The government sets out guidelines for contaminants and as long as the treatment plant removes enough, the water is safe to drink.
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Guidelines in Canada» Guidelines for:
˃ Iron, arsenic, and nitrate – due to aesthetic or health effects on people who drink the water
» No guidelines for:˃ Ammonia & phosphorus – as they are not usually dangerous at levels
found in drinking water
» Safe Drinking Water Foundation suggests decreasing the allowable limits on contaminants that have guidelines & making guidelines for contaminants that do not have guidelines.
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Chlorine» What do you think of when you hear that word?
˃ Usually we think of swimming pools
» What is the function of adding chlorine to pools?˃ Chlorine is used to disinfect water - in pools or for drinking!
» What does chlorine do to the water?˃ Kills microorganisms (bacteria & viruses)˃ Also reacts with and removes chemicals like ammonia˃ Produces small amounts of Chlorine Byproducts during disinfection