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Lesson Eight WT4 Operators

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  answer and any notes about the answer that may be
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Lesson Eight WT4 Operators
Answers
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• Susceptible to pollution
• Temperature changes
• pH changes
• Water level changes
• Turbidly
• Often less hard

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Lesson Eight WT4 Operators
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• Fertilizers
• Pesticides
• Animal waste

Runoffs from rain drain into lake
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• Colder water is denser
• Flocculation is slower
• Sedimentation is slower
• Chemical reactions usually take more time

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• Direct influence
• Any water beneath the surface of theground with
• Significant occurrence of insects or
  othermacroorganisms, algae or large-diameterpath
  ogens such as Giardia

If you answered C, it might help, but
chlorination must be combinedwith very fine
filtration to be effective against Giardia.Ozone
works better. Giardia looks a little like a face
staring at you.
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Coagulation Rapid mixing of coagulants with
waterto cause very small particles to
jointogether (floc)
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• Coagulants include
• aluminum sulfate (alum)
• ferric chloride
• synthetic polymers

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• What is pH?
• potential (of) Hydrogen
• Measures activity of hydrogen ions(H) in a
  solution

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Sort of a trick question. If you answered A,
your might becorrect, but you never know without
testing. C is the best answer. The point
here is that you need to know what your water
characteristicsare before making a decision on
what water treatment chemicals to use.
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Lesson Eight WT4 Operators
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• Perform laboratory testing with product
  sampleson your water (jar testing)