Page 1 of 46
WATER TREATMENT GRADE 4 EXAM PREP |
FREQUENTLY TESTED QUESTIONS WITH
CORRECT ANSWERS | BRAND NEW!
Which Oxidant has the potential of producing chlorate (CLO3) by-
products - ✔✔✔ Correct Answer > Chlorine Dioxide
Why do solids-contact basins have much shorter detention times
than conventional treatment basins? - ✔✔✔ Correct Answer > because
of the recycled materials from the sludge blanket the chemical
reactions occur more quickly and completely in mixing areas
UV disinfection - ✔✔✔ Correct Answer > is insensitive to PH and
Temperature
Which method for chlorine dioxide generation is most likely to
have substantial amounts of chlorine in solution - ✔✔✔ Correct
Answer > Add chlorine to water then this water to hydrochloric acid
and sodium chlorate
Because Ozone cannot be stored - ✔✔✔ Correct Answer > it must be
generated on site as it is needed
,Page 2 of 46
when air is used as the feed gas for an ozone generator it must
be - ✔✔✔ Correct Answer > extremely Dry
list 3 devices available to introduce ozone into the water to be
treated - ✔✔✔ Correct Answer > Injector, Mixer, and spray chamber
which authority sets the limits for the amount of ozone allowed
in the treatment plant and in the area surrounding the plant - ✔✔✔
Correct Answer > OSHA
permanganate dosages of what level are usually sufficient to
control most oxidizable taste and odor causing materials in raw
water - ✔✔✔ Correct Answer > .05- 2.5
Reverse osmosis membranes will compact faster with - ✔✔✔
Correct Answer > higher pressure
reverse osmosis membrane cleaning solution feed systems are
constructed of - ✔✔✔ Correct Answer > stainless steel
reverse osmosis reject water can be disposed of by discharging
it to wastewater treatment plant, deep well injection and
,Page 3 of 46
evaporation ponds but cant be disposed by - ✔✔✔ Correct Answer >
using as drinking water
the amount of reject water from a reverse osmosis unit is
dependent on the number of stages in which the membranes are
configured and the - ✔✔✔ Correct Answer > feed pressure
over time the performance of all membranes will change mainly
as a result of compaction and - ✔✔✔ Correct Answer > fouling
flow of solution adjacent or parallel to the surface if the
membrane is referred to as - ✔✔✔ Correct Answer > crossflow
what is the term for raw water that gas undergone pretreatment
prior to entering the membrane arrays - ✔✔✔ Correct Answer > feed
water
what term refers to the process of forcing a liquid through a
nonporous membrane thereby removing particles and dissolved
molecules and ions - ✔✔✔ Correct Answer > reverse osmosis
what us flux decline - ✔✔✔ Correct Answer > membrane performance
changing because of compaction
, Page 4 of 46
when should core samples be collected from filters using
granular activated carbon - ✔✔✔ Correct Answer > at the time of
instillation and every 6 months after
which bed expansion during backwash must be achieved for
filters using granular activated carbon - ✔✔✔ Correct Answer > 50%
what is the best approach for feeding PAC - ✔✔✔ Correct Answer >
after filtration
back washing rate procedures should be reassessed to
determine the cause of GAC loss of the loss per year is exceeds -
✔✔✔ Correct Answer > 2 inches/ 50mm
in regards to safety Wet activated carbon will remove which of
the following from the air - ✔✔✔ Correct Answer > oxygen
what is the most probable cause of tastes and odors persisting
or worsening when PAC is used - ✔✔✔ Correct Answer > pac and
chlorine being added to close to each other
because pac is a fine powder - ✔✔✔ Correct Answer > dust can be a
major problem
WATER TREATMENT GRADE 4 EXAM PREP |
FREQUENTLY TESTED QUESTIONS WITH
CORRECT ANSWERS | BRAND NEW!
Which Oxidant has the potential of producing chlorate (CLO3) by-
products - ✔✔✔ Correct Answer > Chlorine Dioxide
Why do solids-contact basins have much shorter detention times
than conventional treatment basins? - ✔✔✔ Correct Answer > because
of the recycled materials from the sludge blanket the chemical
reactions occur more quickly and completely in mixing areas
UV disinfection - ✔✔✔ Correct Answer > is insensitive to PH and
Temperature
Which method for chlorine dioxide generation is most likely to
have substantial amounts of chlorine in solution - ✔✔✔ Correct
Answer > Add chlorine to water then this water to hydrochloric acid
and sodium chlorate
Because Ozone cannot be stored - ✔✔✔ Correct Answer > it must be
generated on site as it is needed
,Page 2 of 46
when air is used as the feed gas for an ozone generator it must
be - ✔✔✔ Correct Answer > extremely Dry
list 3 devices available to introduce ozone into the water to be
treated - ✔✔✔ Correct Answer > Injector, Mixer, and spray chamber
which authority sets the limits for the amount of ozone allowed
in the treatment plant and in the area surrounding the plant - ✔✔✔
Correct Answer > OSHA
permanganate dosages of what level are usually sufficient to
control most oxidizable taste and odor causing materials in raw
water - ✔✔✔ Correct Answer > .05- 2.5
Reverse osmosis membranes will compact faster with - ✔✔✔
Correct Answer > higher pressure
reverse osmosis membrane cleaning solution feed systems are
constructed of - ✔✔✔ Correct Answer > stainless steel
reverse osmosis reject water can be disposed of by discharging
it to wastewater treatment plant, deep well injection and
,Page 3 of 46
evaporation ponds but cant be disposed by - ✔✔✔ Correct Answer >
using as drinking water
the amount of reject water from a reverse osmosis unit is
dependent on the number of stages in which the membranes are
configured and the - ✔✔✔ Correct Answer > feed pressure
over time the performance of all membranes will change mainly
as a result of compaction and - ✔✔✔ Correct Answer > fouling
flow of solution adjacent or parallel to the surface if the
membrane is referred to as - ✔✔✔ Correct Answer > crossflow
what is the term for raw water that gas undergone pretreatment
prior to entering the membrane arrays - ✔✔✔ Correct Answer > feed
water
what term refers to the process of forcing a liquid through a
nonporous membrane thereby removing particles and dissolved
molecules and ions - ✔✔✔ Correct Answer > reverse osmosis
what us flux decline - ✔✔✔ Correct Answer > membrane performance
changing because of compaction
, Page 4 of 46
when should core samples be collected from filters using
granular activated carbon - ✔✔✔ Correct Answer > at the time of
instillation and every 6 months after
which bed expansion during backwash must be achieved for
filters using granular activated carbon - ✔✔✔ Correct Answer > 50%
what is the best approach for feeding PAC - ✔✔✔ Correct Answer >
after filtration
back washing rate procedures should be reassessed to
determine the cause of GAC loss of the loss per year is exceeds -
✔✔✔ Correct Answer > 2 inches/ 50mm
in regards to safety Wet activated carbon will remove which of
the following from the air - ✔✔✔ Correct Answer > oxygen
what is the most probable cause of tastes and odors persisting
or worsening when PAC is used - ✔✔✔ Correct Answer > pac and
chlorine being added to close to each other
because pac is a fine powder - ✔✔✔ Correct Answer > dust can be a
major problem
