2
Water Treatment Operator Level 1 Sample Questions (Water
|| || || || || || || ||
Operator Certification Study Guide) with answers
|| || || || ||
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
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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
, 2
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
|| || || ||
How often should sedimentation basins with mechanical sludge removal equipment be
|| || || || || || || || || || ||
drained and inspected? - ✔✔Once a year
|| || || || || ||
What is the most important reason to reduce turbidity? - ✔✔To remove pathogens
|| || || || || || || || || || || ||
What is the filtration flow rate through a manganese greensand pressure filter at 10 degrees
|| || || || || || || || || || || || || ||
C? - ✔✔2 to 3 gpm/sq ft
|| || || || || || ||
When is a filter ripening? - ✔✔When it becomes more efficient in particle removal
|| || || || || || || || || || || || ||
Virgin greensand can be regenerated by soaking the filter bed for several hours in a chlorine
|| || || || || || || || || || || || || || ||
solution of what? - ✔✔100 mg/L
|| || || || || ||
What precipitates can foul a cation exchange resin? - ✔✔Iron and manganese
|| || || || || || || || || || ||
What process works best for sequestering manganese? - ✔✔Polyphosphates and chlorine
|| || || || || || || || || ||
Water Treatment Operator Level 1 Sample Questions (Water
|| || || || || || || ||
Operator Certification Study Guide) with answers
|| || || || ||
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
, 2
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
|| || || ||
How often should sedimentation basins with mechanical sludge removal equipment be
|| || || || || || || || || || ||
drained and inspected? - ✔✔Once a year
|| || || || || ||
What is the most important reason to reduce turbidity? - ✔✔To remove pathogens
|| || || || || || || || || || || ||
What is the filtration flow rate through a manganese greensand pressure filter at 10 degrees
|| || || || || || || || || || || || || ||
C? - ✔✔2 to 3 gpm/sq ft
|| || || || || || ||
When is a filter ripening? - ✔✔When it becomes more efficient in particle removal
|| || || || || || || || || || || || ||
Virgin greensand can be regenerated by soaking the filter bed for several hours in a chlorine
|| || || || || || || || || || || || || || ||
solution of what? - ✔✔100 mg/L
|| || || || || ||
What precipitates can foul a cation exchange resin? - ✔✔Iron and manganese
|| || || || || || || || || || ||
What process works best for sequestering manganese? - ✔✔Polyphosphates and chlorine
|| || || || || || || || || ||
