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Exam (elaborations)
Water Treatment Class 3 – b Exam Updated Solution
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8
January 2025
2024/2025
A+
Suggested free chlorine residual at point just beyond post chlorination - - .5 mg/L
Suggested free chlorine residual for the farthest point in distrib system - - .2 mg/L
Residual is measured in treated water by - - 1) amperometric titration
2) DPD colorimetric
3) ORP probes
Residual readings should be taken how often - - 3 times a day on small systems. Once every 2 hours on large
What happens when an iron pipe is connected to a copper pipe if the water contains dissolved oxygen...
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