The Water Treatment Process

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The Water Treatment Process

• Making Water Drinkable

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Review Questions

• 1. A rose bush was watered on Sunday. After six
  days the soil was dry and the leaves were
  wilting. Explain what happened to the water.
• 2. Why is the earths water never used up?

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Water Treatment

• Water Treatment is the process of making water
  suitable for desired end use (such as drinking).
• Water Treatment occurs as a Systematic Process
  through a Water Treatment Plant

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A Water Treatment Plant
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Water Treatment Process - Steps

• Remove large objects a metal screen blocks
  objects from entering the pipe
• Add alum (a chemical) attracts waste solids to
  form clumps these are called floc (sticky
  clumps formed from the reaction of alum in water,
  combined with sand and other waste solids)

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Steps

• Water and Floc enter settling tank (water moves
  slowly) where floc settles to the bottom
• Partially cleaned water from top of tank moves
  through a sand and charcoal filter to remove
  remaining waste
• Chlorine added to kill organisms
• Water stored or delivered

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Other Treatment Options

• 1. Reverse Osmosis mechanical pressure forces
  water through a membrane that acts like a fine
  filter
• 2. UV radiation destroys most viruses and
  micro-organisms
• 3. In nature, water absorbs minerals calcium and
  magnesium from surronding rock this makes water
  Hard. This is safe to drink but when heated
  leaves mineral deposits.
• 4. Boiling boil for 3 minutes to kill
  micro-organisms and bacteria and drink within a
  few hours

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Stormwater Management

• During spring too much water for plant to handle
  so stormwater goes directly to lake

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Using Water Sustainably

• Only a small amount of worlds water is suitable
  for human use.
• A rising population, pollution and other factors
  are limiting this resource.
• Sustainability means working and behaving in a
  way that protects resources to ensure that they
  are available to future generations.

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Homework Questions

1. List and describe the six main steps that water
   goes through in the water treatment process
2. Is clear, colourless and odourless drinking water
   always safe to drink? Explain.
3. Why is it important to ensure that treated water
   remains safe to drink when it is stored after
   treatment? Describe one way to make stored water
   safe.