LEVEL 1 WATER OPERATOR CERTIF
CORRECT ANSWERS AND
QUESTIONS
The two most important factors impacting the effectiveness of chlorination are - ans-
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concentration of chlorine and contact time ws ws ws ws ws
The treatment process that controls corrosion or scaling is known as - ans-
ws ws ws ws ws ws ws ws ws ws ws ws
Stabilization
Permanganate reactions are highly dependent upon - ans-pH ws ws ws ws ws ws ws
Organism that causes illnesses and is the hardest to kill - ans-cryptosporidiosis
ws ws ws ws ws ws ws ws ws ws ws
Disinfection of water wells with free chlorine requires exposure for ______ hours at a c
ws ws ws ws ws ws ws ws ws ws ws ws ws ws
oncentration of ______mg/L - ans-12-24 hours; 50 mg/Lws ws ws ws ws ws ws
Detention time in flocculation basins are usually designed to provide for - ans-15-
ws ws ws ws ws ws ws ws ws ws ws ws
45 minutes
ws
Alum works best in a Ph range of - ans-5.8 - 7.5
ws ws ws ws ws ws ws ws ws ws ws
What has little effect on colloidal particles since they are so small - ans-gravity
ws ws ws ws ws ws ws ws ws ws ws ws ws
Natural electrical force that keeps colloidal particles apart in water treatment - ans-
ws ws ws ws ws ws ws ws ws ws ws ws
zeta potential ws
The zeta potential measures the number of excess ________ found on the surface of a
ws ws ws ws ws ws ws ws ws ws ws ws ws ws
ll particulate matter - ans-electrons
ws ws ws ws
The device that collects the settled water as it leaves the sedimentation basin - ans-
ws ws ws ws ws ws ws ws ws ws ws ws ws ws
Effluent launder ws
In solid-
ws
contact basins with fairly constant water quality parameters, how often should the solid
ws ws ws ws ws ws ws ws ws ws ws ws
s concentration be determined? - ans-At least twice per day
ws ws ws ws ws ws ws ws ws
The definition of decant is - ans-
ws ws ws ws ws ws
To draw off the liquid from a vessel of any size without stirring up bottom sediment
ws ws ws ws ws ws ws ws ws ws ws ws ws ws ws
, How often should sedimentation basins with mechanical sludge removal equipment be
ws ws ws ws ws ws ws ws ws ws ws
drained and inspected - ans-once a year
ws ws ws ws ws ws
What is the most important reason to reduce turbidity - ans-to remove pathogens
ws ws ws ws ws ws ws ws ws ws ws ws
What is the filtration flow rate through a manganese greensand pressure filterat 10 deg
ws ws ws ws ws ws ws ws ws ws ws ws ws
ree centigrade - ans-2 -3 gpm/ft
ws ws ws ws ws
Virgin greensand can be regenerated by soaking the folter bed for several hours in a s
ws ws ws ws ws ws ws ws ws ws ws ws ws ws ws
olution of chlorine containing - ans-100 mg/L C
ws ws ws ws ws ws ws
When is a filter ripening - ans-when it becomes more efficient in particle removal
ws ws ws ws ws ws ws ws ws ws ws ws ws
What role does the action of straining of suspended particles play during filtration -
ws ws ws ws ws ws ws ws ws ws ws ws ws
ans-minor
ws
The turbidity of settled water before it is applied to the filters (pose sedimentation proce
ws ws ws ws ws ws ws ws ws ws ws ws ws ws
ss) should always be kept below - ans-1 -2 ntu
ws ws ws ws ws ws ws ws ws
What precipitates can foul a cation exchange resin - ans-iron and manganese
ws ws ws ws ws ws ws ws ws ws ws
What process works best for sequestering manganese - ans-
ws ws ws ws ws ws ws ws
polyphosphates and chlorine ws ws
When should polyphosphates use for sequestration of iron and manganese from a well
ws ws ws ws ws ws ws ws ws ws ws ws ws
be injected into the process - ans-right after the water leaves the well
ws ws ws ws ws ws ws ws ws ws ws ws
Recarbonation is - ans-adding CO2 to the water ws ws ws ws ws ws ws
In the ion-
ws ws
exchange softening process, once the resin can no longer soften water it must be -
ws ws ws ws ws ws ws ws ws ws ws ws ws ws
ans-regenerated
ws
Under no circumstances should a composite sample be collected for what type of analy
ws ws ws ws ws ws ws ws ws ws ws ws ws
sis - ans-bacteriological
ws ws
The number of monthly distribution system chlorine residual samples required is based
ws ws ws ws ws ws ws ws ws ws ws ws
on - ans-based on population
ws ws ws ws
What is the ideal indicator for pathogens - ans-coliform group bacteria
ws ws ws ws ws ws ws ws ws ws
When one substance is dissolved in another and will not settle out, what is this product
ws ws ws ws ws ws ws ws ws ws ws ws ws ws ws w
called - ans-a solution
s ws ws ws
Acid, bases, and salts lacking carbon are - ans-inorganic compounds
ws ws ws ws ws ws ws ws ws
CORRECT ANSWERS AND
QUESTIONS
The two most important factors impacting the effectiveness of chlorination are - ans-
ws ws ws ws ws ws ws ws ws ws ws ws
concentration of chlorine and contact time ws ws ws ws ws
The treatment process that controls corrosion or scaling is known as - ans-
ws ws ws ws ws ws ws ws ws ws ws ws
Stabilization
Permanganate reactions are highly dependent upon - ans-pH ws ws ws ws ws ws ws
Organism that causes illnesses and is the hardest to kill - ans-cryptosporidiosis
ws ws ws ws ws ws ws ws ws ws ws
Disinfection of water wells with free chlorine requires exposure for ______ hours at a c
ws ws ws ws ws ws ws ws ws ws ws ws ws ws
oncentration of ______mg/L - ans-12-24 hours; 50 mg/Lws ws ws ws ws ws ws
Detention time in flocculation basins are usually designed to provide for - ans-15-
ws ws ws ws ws ws ws ws ws ws ws ws
45 minutes
ws
Alum works best in a Ph range of - ans-5.8 - 7.5
ws ws ws ws ws ws ws ws ws ws ws
What has little effect on colloidal particles since they are so small - ans-gravity
ws ws ws ws ws ws ws ws ws ws ws ws ws
Natural electrical force that keeps colloidal particles apart in water treatment - ans-
ws ws ws ws ws ws ws ws ws ws ws ws
zeta potential ws
The zeta potential measures the number of excess ________ found on the surface of a
ws ws ws ws ws ws ws ws ws ws ws ws ws ws
ll particulate matter - ans-electrons
ws ws ws ws
The device that collects the settled water as it leaves the sedimentation basin - ans-
ws ws ws ws ws ws ws ws ws ws ws ws ws ws
Effluent launder ws
In solid-
ws
contact basins with fairly constant water quality parameters, how often should the solid
ws ws ws ws ws ws ws ws ws ws ws ws
s concentration be determined? - ans-At least twice per day
ws ws ws ws ws ws ws ws ws
The definition of decant is - ans-
ws ws ws ws ws ws
To draw off the liquid from a vessel of any size without stirring up bottom sediment
ws ws ws ws ws ws ws ws ws ws ws ws ws ws ws
, How often should sedimentation basins with mechanical sludge removal equipment be
ws ws ws ws ws ws ws ws ws ws ws
drained and inspected - ans-once a year
ws ws ws ws ws ws
What is the most important reason to reduce turbidity - ans-to remove pathogens
ws ws ws ws ws ws ws ws ws ws ws ws
What is the filtration flow rate through a manganese greensand pressure filterat 10 deg
ws ws ws ws ws ws ws ws ws ws ws ws ws
ree centigrade - ans-2 -3 gpm/ft
ws ws ws ws ws
Virgin greensand can be regenerated by soaking the folter bed for several hours in a s
ws ws ws ws ws ws ws ws ws ws ws ws ws ws ws
olution of chlorine containing - ans-100 mg/L C
ws ws ws ws ws ws ws
When is a filter ripening - ans-when it becomes more efficient in particle removal
ws ws ws ws ws ws ws ws ws ws ws ws ws
What role does the action of straining of suspended particles play during filtration -
ws ws ws ws ws ws ws ws ws ws ws ws ws
ans-minor
ws
The turbidity of settled water before it is applied to the filters (pose sedimentation proce
ws ws ws ws ws ws ws ws ws ws ws ws ws ws
ss) should always be kept below - ans-1 -2 ntu
ws ws ws ws ws ws ws ws ws
What precipitates can foul a cation exchange resin - ans-iron and manganese
ws ws ws ws ws ws ws ws ws ws ws
What process works best for sequestering manganese - ans-
ws ws ws ws ws ws ws ws
polyphosphates and chlorine ws ws
When should polyphosphates use for sequestration of iron and manganese from a well
ws ws ws ws ws ws ws ws ws ws ws ws ws
be injected into the process - ans-right after the water leaves the well
ws ws ws ws ws ws ws ws ws ws ws ws
Recarbonation is - ans-adding CO2 to the water ws ws ws ws ws ws ws
In the ion-
ws ws
exchange softening process, once the resin can no longer soften water it must be -
ws ws ws ws ws ws ws ws ws ws ws ws ws ws
ans-regenerated
ws
Under no circumstances should a composite sample be collected for what type of analy
ws ws ws ws ws ws ws ws ws ws ws ws ws
sis - ans-bacteriological
ws ws
The number of monthly distribution system chlorine residual samples required is based
ws ws ws ws ws ws ws ws ws ws ws ws
on - ans-based on population
ws ws ws ws
What is the ideal indicator for pathogens - ans-coliform group bacteria
ws ws ws ws ws ws ws ws ws ws
When one substance is dissolved in another and will not settle out, what is this product
ws ws ws ws ws ws ws ws ws ws ws ws ws ws ws w
called - ans-a solution
s ws ws ws
Acid, bases, and salts lacking carbon are - ans-inorganic compounds
ws ws ws ws ws ws ws ws ws
