AWWA Operator Certification Study Guide 4thED. - Water Treatment Sample Test 3 Questions and Answers
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AWWA Operator Certification Study Guide 4thED. - Water Treatment Sample Test 3 Questions and Answers
The concentration of chlorine that is immediately dangerous to health and life (IDHL) is _____ parts per million.
30ppm
The common rate of operation of a rapid sand filter is considered to ...
an operator inspects valves to determine that they
a 2 foot wide rectangular channel is flowing 18 i
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AWWA Operator Certification Study
Guide 4thED. - Water Treatment Sample
Test 3 Questions and Answers
The concentration of chlorine that is immediately dangerous to health and life (IDHL) is
_____ parts per million. - answer30ppm
The common rate of operation of a rapid sand filter is considered to be _____ gallons
per square foot per minute. - answer2 to 6
An operator inspects valves to determine that they are holding properly by... - answera
pressure test
Trihalomethane (THM) precursors are _____ compounds. - answernatural organic
How many gallons does 1,000 feet of 15-inch diameter pipe contain? - answer9,175
Chemicals that may be used for corrosion control in water treatment are; -
answerphosphate compounds, sodium bicarbonate, calcium hydroxide, and sodium
carbonate
A 2-foot wide rectangular channel is flowing 18 inches deep with an average velocity of
5 feet per second. The rate of flow is approximately _____ cubic feet per second. -
answer15
A dosage of 17.1 mg/L coagulant applied to water in a plant of 1,000 gallons per minute
capacity and operating over a 10-hour period will require a total of _____ pounds of
coagulant. - answer85.5
Three most commonly used coagulants in water treatment are; - answeraluminum
sulfate, ferric chloride, and ferrous sulfate
An employer must have a Process Safety Plan if the plant has the capability of storing
at least _____ pounds of chlorine. - answer1,500
A high heterotrophic plate count (HPC) in water samples; - answercan mask detection
of coliforms
How many pounds of polymer are required to make up 750 gallons of 0.25 percent
polymer solution? - answer15.6 (pounds per gallon formula)
, Potassium permanganate is applied in water treatment for... - answera regenerant and
oxidant
In order for a chemical to function satisfactorily as a coagulant, it must... - answerreact
with the alkalinity in the water causing floc formations
CT is defined as... - answerThe product of residual disinfectant concentration and
contact time of the disinfectant with the water.
The function of the filter underdrains is best described as... - answercollection of treated
water and distribution of backwash
The C factor, or carrying capacity of pipelines, is often reduced by... -
answertuberculation
Which is an example of an acute violation? - answera positive sample for total coliforms
when E. coli are present.
An odorous gas produced by anaerobic decomposition is... - answerhydrogen sulfide
The USEPA's stance on point-of-use (POU) devices and bottled water is; - answer1.
POU devices and bottled water cannot be used to meet MCL's
2. POU devices and bottled water may be required as a condition of a variance or
exemption
3. POU devices and bottled water are not best available technology (BAT)
One of the most common causes of mud balls in the filter media is... - answerinsufficient
backwash rate
Which is the most effective compound for controlling algae growth? - answercopper
sulfate
The source of contamination by two suspected carcinogens, acrylamide, and
epichlorohydrin, is... - answerpolymer coagulants
Activated carbon is widely used for taste-and-odor control because it... - answerhas
absorptive properties
Greensand is often used as a filter medium for water with high... - answermanganese
concetrations
A circular clarifier treats a flow of 1.2 million gallons per day. The diameter is 55 feet;
the depth is 8 feet. What is the surface loading? - answer505 gallons per day per
square foot
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