ACTUAL QUESTIONS AND DETAILED SOLUTIONS
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which of the following tasks are typical duties for a water
treatment operator?
1.collect representative water samples
2.conduct safety inspections
3.maintain plant records
4.make periodic operating checks of plant equipment
5.preform routine maintenance - ANSWER-1,2,3,4,5
What is the probable cause of a drop chlorine level? -
ANSWER-increase in chlorine demand
,What are the two forms of activated carbon used in water
treatment? - ANSWER-PAC & GAC
Following the softening process, the pH is high and the
water is _____ with excess caustic alkalinity in either the
hydroxide or carbonate form. - ANSWER-Supersaturated
What is split treatment mainly used for? - ANSWER-
Remove Magnesium
What is a hypochlorinator ? - ANSWER-Chlorine pumps,
chemical feed pumps, or devices used to dispense
chlorine solutions made from hypochlorites, such as
,bleach (sodium hypochlorite) or calcium hypochlorite, into
the water being treated.
WHAT ARE TWO METHODS OF FEEDING
HYPOCHLORITE? - ANSWER-Eject/inject and direct
which of the following are commonly used coagulation
chemicals?
Alum
Hypochlorites
metallic salts
polymers
sodium chlorida - ANSWER-Alum, metallic salts, polymers
, Which of the following factors are important when
evaluating jar test?
1) The amount of floc formed
2) Clarity of the water above settled floc
3)Clarity of water between floc particles
4)Floc settling rate
5) Sodium chloride - ANSWER-all of the above
Which items are adjusted in the enhanced coagulation
process?
1) basic contents
2)coagulation dosage
3)detention time
4)mixing