WATER TREATMENT FINAL PAPER
QUESTIONS SOLUTIONS GRADED A+
◉ What is the solution used to regenerate a zeolite softening unit?
Answer: Sodium chloride solution or NaCL
◉ Langelier's index is used to determine Answer: Corrosiveness
◉ An effective chemical to raise pH is.... Answer: Caustic Soda AKA
Sodium Hydroxide
◉ Minerals that cause an increase in alkalinity are? Answer: Calcium
Carbonate and Magnesium Bicarbonate
◉ A problem related to ion exchange softeners is? Answer: Increase
in sodium content
◉ Reservoir turnover is caused by... Answer: denser water at the
surface sinking towards the bottom
◉ In a reservoir, the main water constituent that encourages algae
growth is? Answer: Phosphorous
,◉ A bubbler measures water level by sensing Answer: Air pressure
◉ The primary contaminant that is important to public health is?
Answer: Bacteria
◉ What cannot be controlled in the normal operation of a sand
filter? Answer: Influent turbidity
◉ A partial blockage on the intake line of a centrifugal pump may
cause... Answer: Cavitation
◉ Continuous recording of the influent water turbidity is useful in
indicating when to... Answer: change the alum dosage
◉ Which of the following would most likely improve the
coagulation/flocculation process? Answer: Increase in water
temperature
◉ What water treatment chemical is chemical feeder adjustment
most critical because of potential toxicity? Answer: Sodium fluoride
◉ A chemical feed line that is installed after the sedimentation tank
and before the filter is used to inject what chemical? Answer: Filter
aid chemicals
, ◉ A dry chemical feeder is suitable for adding.... Answer: potassium
permanganate
◉ Carbon dioxide is used in water treatment to do what? Answer:
Lower pH
◉ pH meters should be standardized against.... Answer: a buffer
solution with pH approaching that of the sample
◉ A Zeolite softening unit will replace calcium and magnesium ions
with... Answer: sodium ions
◉ A liquid form of fluoride that is most widely used in water
treatment is.... Answer: fluosilicic acid
◉ When alum is added to water, a floc is formed from the
combination of alum and.... Answer: Alkalinity
◉ Successful performance of a sedimentation basin depends greatly
upon... Answer: surface settling rate
◉ Potassium permanganate is a chemical most often used to...
Answer: removed dissolved iron
QUESTIONS SOLUTIONS GRADED A+
◉ What is the solution used to regenerate a zeolite softening unit?
Answer: Sodium chloride solution or NaCL
◉ Langelier's index is used to determine Answer: Corrosiveness
◉ An effective chemical to raise pH is.... Answer: Caustic Soda AKA
Sodium Hydroxide
◉ Minerals that cause an increase in alkalinity are? Answer: Calcium
Carbonate and Magnesium Bicarbonate
◉ A problem related to ion exchange softeners is? Answer: Increase
in sodium content
◉ Reservoir turnover is caused by... Answer: denser water at the
surface sinking towards the bottom
◉ In a reservoir, the main water constituent that encourages algae
growth is? Answer: Phosphorous
,◉ A bubbler measures water level by sensing Answer: Air pressure
◉ The primary contaminant that is important to public health is?
Answer: Bacteria
◉ What cannot be controlled in the normal operation of a sand
filter? Answer: Influent turbidity
◉ A partial blockage on the intake line of a centrifugal pump may
cause... Answer: Cavitation
◉ Continuous recording of the influent water turbidity is useful in
indicating when to... Answer: change the alum dosage
◉ Which of the following would most likely improve the
coagulation/flocculation process? Answer: Increase in water
temperature
◉ What water treatment chemical is chemical feeder adjustment
most critical because of potential toxicity? Answer: Sodium fluoride
◉ A chemical feed line that is installed after the sedimentation tank
and before the filter is used to inject what chemical? Answer: Filter
aid chemicals
, ◉ A dry chemical feeder is suitable for adding.... Answer: potassium
permanganate
◉ Carbon dioxide is used in water treatment to do what? Answer:
Lower pH
◉ pH meters should be standardized against.... Answer: a buffer
solution with pH approaching that of the sample
◉ A Zeolite softening unit will replace calcium and magnesium ions
with... Answer: sodium ions
◉ A liquid form of fluoride that is most widely used in water
treatment is.... Answer: fluosilicic acid
◉ When alum is added to water, a floc is formed from the
combination of alum and.... Answer: Alkalinity
◉ Successful performance of a sedimentation basin depends greatly
upon... Answer: surface settling rate
◉ Potassium permanganate is a chemical most often used to...
Answer: removed dissolved iron
