Water Treatment Operator Level 1 Sample Questions (Water Operator Cer
tification Study Guide)
Study online at https://quizlet.com/_3rlhw3
1. What are the two important factors impacting the ef- Concentration of chlorine
fectiveness of chlorination? and contact time
2. The treatment process that controls corrosion or scal- Stabilization
ing is known as what?
3. Permanganate reactions are highly dependent on pH
what factor?
4. It is hardest to kill the organism that causes what ill- Cryptosporidiosis
ness?
5. Disinfection of water wells with free chlorine requires 12 to 24 hours; 50mg/L
exposure for how long and at what concentration?
6. Flocculation basins are usually designed to provide for 15 to 45 minutes
detention times of how long?
7. Alum works best in a pH range of what? 5.8 to 7.5
8. What has little effect on colloidal particles because of Gravity
their small size?
9. What natural electrical force keeps colloidal particles Zeta potential
apart in water treatment?
10. What does the zeta potential measure? The number of excess
electrons found on the
surface of all particulate
matter
11. What device collects the settled water as it leaves the The effluent launder
sedimentation basin?
1/5
, Water Treatment Operator Level 1 Sample Questions (Water Operator Cer
tification Study Guide)
Study online at https://quizlet.com/_3rlhw3
12. In solid-contact basins with fairly constant water quali- At least twice per day
ty parameters, how often should the solids concentra-
tion be determined?
13. What is the definition of decant? To draw off the liquid from
a vessel of any size without
stirring up bottom sedi-
mentation
14. How often should sedimentation basins with mechani- Once a year
cal sludge removal equipment be drained and inspect-
ed?
15. What is the most important reason to reduce turbidity? To remove pathogens
16. What is the filtration flow rate through a manganese 2 to 3 gpm/sq ft
greensand pressure filter at 10 degrees C?
17. When is a filter ripening? When it becomes more ef-
ficient in particle removal
18. Virgin greensand can be regenerated by soaking the 100 mg/L
filter bed for several hours in a chlorine solution of
what?
19. What precipitates can foul a cation exchange resin? Iron and manganese
20. What process works best for sequestering man- Polyphosphates and chlo-
ganese? rine
21. Adding CO2 to water is known as what? Recarbonation
22. Regeneration
2/5
tification Study Guide)
Study online at https://quizlet.com/_3rlhw3
1. What are the two important factors impacting the ef- Concentration of chlorine
fectiveness of chlorination? and contact time
2. The treatment process that controls corrosion or scal- Stabilization
ing is known as what?
3. Permanganate reactions are highly dependent on pH
what factor?
4. It is hardest to kill the organism that causes what ill- Cryptosporidiosis
ness?
5. Disinfection of water wells with free chlorine requires 12 to 24 hours; 50mg/L
exposure for how long and at what concentration?
6. Flocculation basins are usually designed to provide for 15 to 45 minutes
detention times of how long?
7. Alum works best in a pH range of what? 5.8 to 7.5
8. What has little effect on colloidal particles because of Gravity
their small size?
9. What natural electrical force keeps colloidal particles Zeta potential
apart in water treatment?
10. What does the zeta potential measure? The number of excess
electrons found on the
surface of all particulate
matter
11. What device collects the settled water as it leaves the The effluent launder
sedimentation basin?
1/5
, Water Treatment Operator Level 1 Sample Questions (Water Operator Cer
tification Study Guide)
Study online at https://quizlet.com/_3rlhw3
12. In solid-contact basins with fairly constant water quali- At least twice per day
ty parameters, how often should the solids concentra-
tion be determined?
13. What is the definition of decant? To draw off the liquid from
a vessel of any size without
stirring up bottom sedi-
mentation
14. How often should sedimentation basins with mechani- Once a year
cal sludge removal equipment be drained and inspect-
ed?
15. What is the most important reason to reduce turbidity? To remove pathogens
16. What is the filtration flow rate through a manganese 2 to 3 gpm/sq ft
greensand pressure filter at 10 degrees C?
17. When is a filter ripening? When it becomes more ef-
ficient in particle removal
18. Virgin greensand can be regenerated by soaking the 100 mg/L
filter bed for several hours in a chlorine solution of
what?
19. What precipitates can foul a cation exchange resin? Iron and manganese
20. What process works best for sequestering man- Polyphosphates and chlo-
ganese? rine
21. Adding CO2 to water is known as what? Recarbonation
22. Regeneration
2/5
