COLORADO WASTEWATER
TREATMENT OPERATOR CLASS
D EXAM
__________________ is a pretreatment process used to remove
gravel, sand, and silt from the raw water before it enters the main
treatment facility. - ANSWERS-pre-sedimentation
What details are included in complete, up-to-date operating records
for screening equipment? - ANSWERS-Date of inspections, amount
of material removed from screens (in cubic feet), notations about
unusual activity.
Alum works best in a pH range of - ANSWERS-5.8-7.5
What are most flocculation basins are designed for: - ANSWERS-
tapered flocculation
Virgin greensand can be regenerated by soaking filter bed for several
hours in a solution of chlorine containing... - ANSWERS-100 mg/L
CL2
What are three advantages of slow sand filters? - ANSWERS-Low
operating costs, low construction costs, low maintenance costs
, When a chlorine cylinder or container is changed, a new gasket
should be used... - ANSWERS-Everytime
The two most important factors impacting the effectiveness of
chlorination are - ANSWERS-Concentration and contact time of
chlorine
In the chlorination process, what term refers to the point beyond
which the addition of more chlorine produces free residual chlorine? -
ANSWERS-Breakpoint
Teeth are likely to become pitted when the fluoride concentration in
drinking water goes above which amount? - ANSWERS-4 mg/L
What turns consumers clothes black? - ANSWERS-High amount of
Manganese
What % of oxygen is needed in confined spaces? - ANSWERS-19.5%
What is sodium hypochlorite? - ANSWERS-Bleach, it disinfects
water.
Which type of filter do you skim, not backwash? - ANSWERS-
Cartridge Filters
TREATMENT OPERATOR CLASS
D EXAM
__________________ is a pretreatment process used to remove
gravel, sand, and silt from the raw water before it enters the main
treatment facility. - ANSWERS-pre-sedimentation
What details are included in complete, up-to-date operating records
for screening equipment? - ANSWERS-Date of inspections, amount
of material removed from screens (in cubic feet), notations about
unusual activity.
Alum works best in a pH range of - ANSWERS-5.8-7.5
What are most flocculation basins are designed for: - ANSWERS-
tapered flocculation
Virgin greensand can be regenerated by soaking filter bed for several
hours in a solution of chlorine containing... - ANSWERS-100 mg/L
CL2
What are three advantages of slow sand filters? - ANSWERS-Low
operating costs, low construction costs, low maintenance costs
, When a chlorine cylinder or container is changed, a new gasket
should be used... - ANSWERS-Everytime
The two most important factors impacting the effectiveness of
chlorination are - ANSWERS-Concentration and contact time of
chlorine
In the chlorination process, what term refers to the point beyond
which the addition of more chlorine produces free residual chlorine? -
ANSWERS-Breakpoint
Teeth are likely to become pitted when the fluoride concentration in
drinking water goes above which amount? - ANSWERS-4 mg/L
What turns consumers clothes black? - ANSWERS-High amount of
Manganese
What % of oxygen is needed in confined spaces? - ANSWERS-19.5%
What is sodium hypochlorite? - ANSWERS-Bleach, it disinfects
water.
Which type of filter do you skim, not backwash? - ANSWERS-
Cartridge Filters
