Part 4: Water Purification

Drinking water in North York comes from the Ontario Lake. The location of these water treatment plants are usually near the source of water. Some activities in watersheds that affects water quality are misuse of equipments, accidents such as spills, improper way storing water, dirty or contaminated equipments, water expose to air pollution, water expose to bacteria e.c.t.

How water is treated before coming to us:
1. Water is collected from Lake Ontario from long pipes.
2.Water passes through travelling screen which remove most of the large waste.
3.Chlorine and Alum is added to the water to kill microorganism and create clumps of waste .
4.The water is settle in a basin and the clumps of waste settle down to the bottom of the basin with cleaner water at the top.
5.The top layer of water is drawn and gets filter with sand, gravel and carbon to remove any clumps of waste. This process also remove harmful chemicals, microorganism, odour and taste from the water.

6.The water is then store in another basin and more chlorine and fluorine is added to kill off any extra microorganism.
7.Sulfur Dioxide and ammonia are added to remove excess chlorine and stabilize the amount of chlorine.
8.The water is then tested many times and when safe enough it is pumped through the water pipes and into our homes.

News, C. (2011, March 16). Pickering nuclear plant reports water leak. Retrieved January 19, 2016, from


How waste water is treated after usage:
1. septic tanks are use to store the waste letting it decompose and then the large solid waste gets pump out and get dispose of separately.
2. The liquid waste goes through a travelling screen which removes most of the waste clumps.
3.Chlorine is then added to kill off harmful chemicals and microorganism.
4.Excess chlorine gets remove and let out into lakes.
5. If farther treatment is needed the waste was will be expose to oxygen letting bacteria eat and kill off of the remaining microorganisms.


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