Water Treatment Operator Level 1
Sample Questions (Water Operator
Certification Study Guide) Already
Passed
What are the two important factors impacting the effectiveness of chlorination?
✔✔Concentration of chlorine and contact time
The treatment process that controls corrosion or scaling is known as what? ✔✔Stabilization
Permanganate reactions are highly dependent on what factor? ✔✔pH
It is hardest to kill the organism that causes what illness? ✔✔Cryptosporidiosis
Disinfection of water wells with free chlorine requires exposure for how long and at what
concentration? ✔✔12 to 24 hours; 50mg/L
Flocculation basins are usually designed to provide for detention times of how long? ✔✔15 to 45
minutes
, Alum works best in a pH range of what? ✔✔5.8 to 7.5
What has little effect on colloidal particles because of their small size? ✔✔Gravity
What natural electrical force keeps colloidal particles apart in water treatment? ✔✔Zeta potential
What does the zeta potential measure? ✔✔The number of excess electrons found on the surface
of all particulate matter
What device collects the settled water as it leaves the sedimentation basin? ✔✔The effluent
launder
In solid-contact basins with fairly constant water quality parameters, how often should the solids
concentration be determined? ✔✔At least twice per day
What is the definition of decant? ✔✔To draw off the liquid from a vessel of any size without
stirring up bottom sedimentation
Sample Questions (Water Operator
Certification Study Guide) Already
Passed
What are the two important factors impacting the effectiveness of chlorination?
✔✔Concentration of chlorine and contact time
The treatment process that controls corrosion or scaling is known as what? ✔✔Stabilization
Permanganate reactions are highly dependent on what factor? ✔✔pH
It is hardest to kill the organism that causes what illness? ✔✔Cryptosporidiosis
Disinfection of water wells with free chlorine requires exposure for how long and at what
concentration? ✔✔12 to 24 hours; 50mg/L
Flocculation basins are usually designed to provide for detention times of how long? ✔✔15 to 45
minutes
, Alum works best in a pH range of what? ✔✔5.8 to 7.5
What has little effect on colloidal particles because of their small size? ✔✔Gravity
What natural electrical force keeps colloidal particles apart in water treatment? ✔✔Zeta potential
What does the zeta potential measure? ✔✔The number of excess electrons found on the surface
of all particulate matter
What device collects the settled water as it leaves the sedimentation basin? ✔✔The effluent
launder
In solid-contact basins with fairly constant water quality parameters, how often should the solids
concentration be determined? ✔✔At least twice per day
What is the definition of decant? ✔✔To draw off the liquid from a vessel of any size without
stirring up bottom sedimentation
