Water Treatment Operator Cert 1 Questions
with Correct Answers
What is the most common disinfection by product when adding chlorine to water
containing natural and inorganic matter?
a. Chloroform *
b. bromodichloromethane
c. monochloroacetic acid
d. dichloroacetic acid
What will most probably cause taste and odors, slime, and filter clogging?
a. decaying plant material
b. filamentous fungi
c. blue-green algae *
d. some species of ciliated protozoa
Why can rapid sand filters handle higher filtration rate compared to slow sand filters?
a. finer sand
b. coarser sand *
c. much higher water level above the filter's media, thus higher head pressure
d. media not as thick
Iron bacteria can interfere with ________ because the bacteria produce ________ that
prevents the stabilization chemicals from reaching the pipe surface.
a. stabilization, a slime layer *
b. polyphosphates, an acid
,c. polyphosphates, numerous massive bacterial colonies
d. stabilization, numerous massive bacterial colonies
Hypochlorous acid is favored over hypochlorite ion when the pH is ____________ and
the temperature is _____________.
a. low, high
b. high, high
c. low, low *
d. high, low
What filter has an unstratified media distribution?
a. slow sand filters *
b. rapid sand filters
c. high-rate filters
c. dual-media filters
What is (are) the combined chlorine residuals(s) at pH values ranging from 6.5 to 8.5?
a. monochloramine
b. dichloramine
c. monochloramine and dichloramine *
d. dichloramine and trichloramine
When iron alone is treated using manganese greensand filters, the chlorine feed rate
should be about ____________.
a. 1.0 to 1.2 times the iron concentration *
b. 1.2 to 1.5 times the iron concentration
,c. 1.5 to 1.8 times the iron concentration
d. 1.5 to 2.0 times the iron concentration
Chlorination of water that has high concentrations of natural organic matter will
produce?
a. PCBs
b. BTEX
c. MTBX
d. THMs *
When disinfecting with chloramine, when can the ammonia be added to the process?
a. Before the chlorine
b. Same time as the chlorine
c. after the chlorine
d. all of the above *
What will settle out of the water in a short period of time?
a. protozoans
b. organic matter
c. very fine silt *
d. bacteria
Point-of-use activated carbon filters are most effective for removing _________.
a. volatile organic chemicals
b. microorganisms
c. radon
d. chlorine *
, potassium permanganate is used as an oxidant for control of _______________.
a. iron and manganese
b. organic precursors
c. tastes and odors
d. all of the above *
The USEPA stage 1 disinfectants and disinfection byproducts Rule established
maximum contaminated levels for haloacetic acids of __________________.
q. 40 μg/ L
b. 50 μg/ L
c. 60 μg/ L *
d. 80 μg/ L
What must an operator periodically check regarding the cyclone separator system?
a. oil for cyclone bin
b. storage bin or hopper to empty of sand and grit *
c. reject water quantity and adjust appropriately
d. flow of reject water
These types of chemicals chemically tie up scale-forming ions and are eventually
ingested by consumers
a. coagulants
b. coagulants aids
c. sequestering agents *
d. water-softening chemicals
with Correct Answers
What is the most common disinfection by product when adding chlorine to water
containing natural and inorganic matter?
a. Chloroform *
b. bromodichloromethane
c. monochloroacetic acid
d. dichloroacetic acid
What will most probably cause taste and odors, slime, and filter clogging?
a. decaying plant material
b. filamentous fungi
c. blue-green algae *
d. some species of ciliated protozoa
Why can rapid sand filters handle higher filtration rate compared to slow sand filters?
a. finer sand
b. coarser sand *
c. much higher water level above the filter's media, thus higher head pressure
d. media not as thick
Iron bacteria can interfere with ________ because the bacteria produce ________ that
prevents the stabilization chemicals from reaching the pipe surface.
a. stabilization, a slime layer *
b. polyphosphates, an acid
,c. polyphosphates, numerous massive bacterial colonies
d. stabilization, numerous massive bacterial colonies
Hypochlorous acid is favored over hypochlorite ion when the pH is ____________ and
the temperature is _____________.
a. low, high
b. high, high
c. low, low *
d. high, low
What filter has an unstratified media distribution?
a. slow sand filters *
b. rapid sand filters
c. high-rate filters
c. dual-media filters
What is (are) the combined chlorine residuals(s) at pH values ranging from 6.5 to 8.5?
a. monochloramine
b. dichloramine
c. monochloramine and dichloramine *
d. dichloramine and trichloramine
When iron alone is treated using manganese greensand filters, the chlorine feed rate
should be about ____________.
a. 1.0 to 1.2 times the iron concentration *
b. 1.2 to 1.5 times the iron concentration
,c. 1.5 to 1.8 times the iron concentration
d. 1.5 to 2.0 times the iron concentration
Chlorination of water that has high concentrations of natural organic matter will
produce?
a. PCBs
b. BTEX
c. MTBX
d. THMs *
When disinfecting with chloramine, when can the ammonia be added to the process?
a. Before the chlorine
b. Same time as the chlorine
c. after the chlorine
d. all of the above *
What will settle out of the water in a short period of time?
a. protozoans
b. organic matter
c. very fine silt *
d. bacteria
Point-of-use activated carbon filters are most effective for removing _________.
a. volatile organic chemicals
b. microorganisms
c. radon
d. chlorine *
, potassium permanganate is used as an oxidant for control of _______________.
a. iron and manganese
b. organic precursors
c. tastes and odors
d. all of the above *
The USEPA stage 1 disinfectants and disinfection byproducts Rule established
maximum contaminated levels for haloacetic acids of __________________.
q. 40 μg/ L
b. 50 μg/ L
c. 60 μg/ L *
d. 80 μg/ L
What must an operator periodically check regarding the cyclone separator system?
a. oil for cyclone bin
b. storage bin or hopper to empty of sand and grit *
c. reject water quantity and adjust appropriately
d. flow of reject water
These types of chemicals chemically tie up scale-forming ions and are eventually
ingested by consumers
a. coagulants
b. coagulants aids
c. sequestering agents *
d. water-softening chemicals
