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WATER TREATMENT GRADE 2 NEWEST 2026/2027
ACTUAL VERIFIED EXAM COMPLETE 230
QUESTIONS AND CORRECT DETAILED ANSWERS
(VERIFIED ANSWERS) |ALREADY GRADED
A+||NEWEST EXAM!!!
How should burning carbon be handled? - answer-it
should be covered with a fine mist of spray from a hose or
chemical foam extinguisher
In a slurry feed system, where should the feeder be
located to ensure there is no danger that the carbon will
settle out in the feed line because of the low flow velocity?
- answer-at exactly the feed point
In a slurry feed system, day tanks are typically made of
what material? - answer-fiberglass
Which type of aerator causes aeration to occur in splash
areas and can be used to oxidize iron and to partially
reduce dissolved gasses? - answer-cascade aerator
Which type of aerator is much more efficient in removing
dissolved gasses and for oxidizing iron and manganese? -
answer-draft aerato
,2|Page
Which of the following is the normal air-to-water ratio at
peak low in a packed tower aerator? - answer-25:1
____________ aerators draw water into the blade of the
aerator and throw the water into the air in tiny droplets, so
that water can pick up oxygen. - answer-surface
Which type of aerator consists of a propeller-like mixing
blade mounted on the end of a vertical shaft driven by a
motor? - answer-mechanical aerator
In a slate-and-coke-tray aerator, the aerator is usually
constructed to have sloping sides, called __________,
which are used to protect the splash from wind loss and
freezing. - answer-splash aprons
List five components of a ring-type cascade aerator. -
answer-any five of the following: central feed pipe, splash
guard, catch bowl, deflector plate, collector pan, overflow
baffle, spray bottle, outlet, inlet, aluminum flange
In general, spray aeration i successful in oxidizing iron or
manganese and is very successful in increasing what
characteristics of water? - answer-diffused oxygen level
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Which of the following is not a component of a typical
hollow-fiber module? - answer-reverse osmosis
membrane
Process recovery is typically ________ percent fr surface
and can be as high as _________ percent. - answer-95;97
In a typical reverse osmosis flow schematic, which of the
following components most closely follows the cartridge
filter? - answer-high-pressure pump
What process is defined as the ratio of the volume of
product water, or permeate produced, to raw water
treated? - answer-recovery
What term describes the raw water that has undergone
pretreatment (acidification or scale inhibitor addition) prior
to entering the membrane arrays? - answer-feedwater
In the precipitative softening plant, what percentage of
solids sludge is produced? - answer-5%
, 4|Page
Which sludge disposal method is most economical for
lime-soda ash softening plants? - answer-lagoons
What process is used to concentrate sludge? - answer-
thickener
What process is used to dewater sludge? - answer-sand
bed
In a rectangular basin, which type of collector uses suction
pipes or a submersible pump to withdraw the sludge from
the basin? - answer-floating-bridge siphon collector
In lime softening facilities, it is normally good practice
store a minimum of _____ supply of each chemical. -
answer-1 months
What is the term for a conical tank in which the softening
reactions take place quite rapidly as the water swirls
upward trough the unit? - answer-pellet reactor
When magnesium hardness is treated with lime, what is
precipitated? - answer-magnesium hydroxide
WATER TREATMENT GRADE 2 NEWEST 2026/2027
ACTUAL VERIFIED EXAM COMPLETE 230
QUESTIONS AND CORRECT DETAILED ANSWERS
(VERIFIED ANSWERS) |ALREADY GRADED
A+||NEWEST EXAM!!!
How should burning carbon be handled? - answer-it
should be covered with a fine mist of spray from a hose or
chemical foam extinguisher
In a slurry feed system, where should the feeder be
located to ensure there is no danger that the carbon will
settle out in the feed line because of the low flow velocity?
- answer-at exactly the feed point
In a slurry feed system, day tanks are typically made of
what material? - answer-fiberglass
Which type of aerator causes aeration to occur in splash
areas and can be used to oxidize iron and to partially
reduce dissolved gasses? - answer-cascade aerator
Which type of aerator is much more efficient in removing
dissolved gasses and for oxidizing iron and manganese? -
answer-draft aerato
,2|Page
Which of the following is the normal air-to-water ratio at
peak low in a packed tower aerator? - answer-25:1
____________ aerators draw water into the blade of the
aerator and throw the water into the air in tiny droplets, so
that water can pick up oxygen. - answer-surface
Which type of aerator consists of a propeller-like mixing
blade mounted on the end of a vertical shaft driven by a
motor? - answer-mechanical aerator
In a slate-and-coke-tray aerator, the aerator is usually
constructed to have sloping sides, called __________,
which are used to protect the splash from wind loss and
freezing. - answer-splash aprons
List five components of a ring-type cascade aerator. -
answer-any five of the following: central feed pipe, splash
guard, catch bowl, deflector plate, collector pan, overflow
baffle, spray bottle, outlet, inlet, aluminum flange
In general, spray aeration i successful in oxidizing iron or
manganese and is very successful in increasing what
characteristics of water? - answer-diffused oxygen level
,3|Page
Which of the following is not a component of a typical
hollow-fiber module? - answer-reverse osmosis
membrane
Process recovery is typically ________ percent fr surface
and can be as high as _________ percent. - answer-95;97
In a typical reverse osmosis flow schematic, which of the
following components most closely follows the cartridge
filter? - answer-high-pressure pump
What process is defined as the ratio of the volume of
product water, or permeate produced, to raw water
treated? - answer-recovery
What term describes the raw water that has undergone
pretreatment (acidification or scale inhibitor addition) prior
to entering the membrane arrays? - answer-feedwater
In the precipitative softening plant, what percentage of
solids sludge is produced? - answer-5%
, 4|Page
Which sludge disposal method is most economical for
lime-soda ash softening plants? - answer-lagoons
What process is used to concentrate sludge? - answer-
thickener
What process is used to dewater sludge? - answer-sand
bed
In a rectangular basin, which type of collector uses suction
pipes or a submersible pump to withdraw the sludge from
the basin? - answer-floating-bridge siphon collector
In lime softening facilities, it is normally good practice
store a minimum of _____ supply of each chemical. -
answer-1 months
What is the term for a conical tank in which the softening
reactions take place quite rapidly as the water swirls
upward trough the unit? - answer-pellet reactor
When magnesium hardness is treated with lime, what is
precipitated? - answer-magnesium hydroxide
