Water Treatment Operator Level 1 Questions (Water
Operator Certification) with all Correct & 100% Verified
Answers |Already Graded A+
What are the two important factors impacting the effectiveness of chlorination? ✔Correct
Answer-Concentration of chlorine and contact time
The treatment process that controls corrosion or scaling is known as what? ✔Correct Answer-
Stabilization
Permanganate reactions are highly dependent on what factor? ✔Correct Answer-pH
It is hardest to kill the organism that causes what illness? ✔Correct Answer-Cryptosporidiosis
Disinfection of water wells with free chlorine requires exposure for how long and at what
concentration? ✔Correct Answer-12 to 24 hours; 50mg/L
Flocculation basins are usually designed to provide for detention times of how long?
✔Correct Answer-15 to 45 minutes
Alum works best in a pH range of what? ✔Correct Answer-5.8 to 7.5
What has little effect on colloidal particles because of their small size? ✔Correct Answer-
Gravity
What natural electrical force keeps colloidal particles apart in water treatment? ✔Correct
Answer-Zeta potential
What does the zeta potential measure? ✔Correct Answer-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? ✔Correct
Answer-The effluent launder
In solid-contact basins with fairly constant water quality parameters, how often should the
solids concentration be determined? ✔Correct Answer-At least twice per day
What is the definition of decant? ✔Correct Answer-To draw off the liquid from a vessel of any
size without stirring up bottom sedimentation
Operator Certification) with all Correct & 100% Verified
Answers |Already Graded A+
What are the two important factors impacting the effectiveness of chlorination? ✔Correct
Answer-Concentration of chlorine and contact time
The treatment process that controls corrosion or scaling is known as what? ✔Correct Answer-
Stabilization
Permanganate reactions are highly dependent on what factor? ✔Correct Answer-pH
It is hardest to kill the organism that causes what illness? ✔Correct Answer-Cryptosporidiosis
Disinfection of water wells with free chlorine requires exposure for how long and at what
concentration? ✔Correct Answer-12 to 24 hours; 50mg/L
Flocculation basins are usually designed to provide for detention times of how long?
✔Correct Answer-15 to 45 minutes
Alum works best in a pH range of what? ✔Correct Answer-5.8 to 7.5
What has little effect on colloidal particles because of their small size? ✔Correct Answer-
Gravity
What natural electrical force keeps colloidal particles apart in water treatment? ✔Correct
Answer-Zeta potential
What does the zeta potential measure? ✔Correct Answer-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? ✔Correct
Answer-The effluent launder
In solid-contact basins with fairly constant water quality parameters, how often should the
solids concentration be determined? ✔Correct Answer-At least twice per day
What is the definition of decant? ✔Correct Answer-To draw off the liquid from a vessel of any
size without stirring up bottom sedimentation
