Water Treatment AWWA Questions Grades 1 and 2. Treatment Process Questions and Answers 100% correct
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Water Treatment AWWA Questions Grades 1 and 2. Treatment Process Questions and Answers 100% correct
What must the effluent NTU for a slow sand filter be kept at during operation?
Less than 1.0 NTU
When water is added too fast to this treatment chemical, it will generate heat and splatterin...
although algae do not typically pose a health conc
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Water Treatment AWWA Questions
Grades 1 and 2. Treatment Process
Questions and Answers 100% correct
What must the effluent NTU for a slow sand filter be kept at during operation? -
answerless than 1.0 NTU
When water is added too fast to this treatment chemical, it will generate heat and
splattering of the chemical. - answer Sulfuric acid
In the lime-softening process, besides CaCO3 being precipitated, what other carbonate
hardness chemical is precipitated? - answer Magnesium hydroxide
Dry alum has a formula of - answerAl2(SO4)3 · 14H2O
What is the most common chemical used for pH and alkalinity adjustment? – answer
Lime
After breakpoint chlorination, what may remain besides the free chlorine? – answer
Choriogenins
Although algae do not typically pose a health concern, some do produce __________
that can be a concern. Other problems they frequently cause in regard to treatment are
__________. - answerneurotoxins and hepatoxins, tastes and odors and filter-clogging
The oxidation process using chlorine will also consume - answeralkalinity
Dry chemicals should be in solution before mixing them with the water to be treated.
What water is recommended to mix the dry chemical in some cases to avoid
precipitates? - answerSoftened water
How are manganese greensand beds regenerated? - answerBackwashed with
permanganate solution
Once breakpoint chlorination has been reached, what percentage of the original
reducing agents are typically still present in a particular water sample? - answer0%
The most preferable method of removing manganese is by using - answerpotassium
permanganate.
, When iron alone is treated using manganese greensand filters, the chlorine feed rate
should be about - answer1.0 to 1.2 times the iron concentration.
What problem can be solved in a sedimentation basin by recycling some previously
settled sludge? - answerSlow floc formation
To eliminate hydrogen sulfide (H2S), the pH of the water should be lowered to ____ or
less before beginning aeration. - answer6.0
What factor will make chlorination successful? - answerHigher concentration
How can an operator compensate for low temperature water and thus slower floc
formation when using alum? - answerIncrease alum dosage
What is (are) the combined chlorine residual(s) at pH values ranging from 6.5 to 8.5? -
answerMonochloramine and dichloramine
What is an advantage for installing a pressure filter for a small water system? -
answerAir binding will not occur
How is magnesium noncarbonate hardness removed? - answerWith lime, then soda
ash
When adding chlorine and sodium hydroxide to water containing manganese, the
oxidation works best in a pH range of - answer6 to 10
Why can rapid sand filters handle higher filtration rates compared to slow sand filters? -
answerCoarser sand
UV is used as a disinfectant because it is effective in the inactivation of _________ and
because it __________. - answerCryptosporidium, does not produce DBPs
Industrial bleaches used in water treatment disinfection range in percentage strength of
available chlorine from - answer9% to 15%
Monomedium filter media is __________ than a conventional filter because the media is
__________. - answerdeeper, coarser
Membranes made of Teflon (polytetrafluoroethylene) have __________ oxidant
resistance. - answerhigh
What chemical does not cause hardness but must be considered when the lime dosage
is being determined? - answercarbon dioxide
Manganese greensand filtration is used to remove - answerManganese, iron, and
hydrogen sulfide
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