2025 WASTEWATER OPERATOR
CERTIFICATION STUDY GUIDE-GRADE
2 | 197 QUESTIONS | WITH ACCURATE
SOLUTIONS!!
, flotation thickening scroll centrifuge
Don't know?
2 of 197
Term
Rocks/Screens/Comminutors & Grit Removal:
Proper flow velocity through a grit channel is indicated when the grit
being removed contains
a. no organics
b. a little organic material
c. about half the volume as the grit being removed
d. about the same volume as the grit being removed
Give this one a try later!
solids concentration chlorine oxidation
remove sludge faster a little organic material
Don't know?
3 of 197
,Term
Wastewater Solids Processing:
Name the solids treatment method that has a solids buildup which
forms a blanket on the bottom and forces the water out due to
compression?
Give this one a try later!
flotation thickening gravity thickening
pasteurization lime stabilization
Don't know?
4 of 197
Term
Wastewater Treatment Facilities:
What should the flow velocity be through a grit channel
Give this one a try later!
0.5 ft/s 3.0 ft/s
1.0 ft/s 2.0 ft/s
, Don't know?
5 of 197
Term
Sedimentation and Flotation:
What is the optimum temperature for digester substances?
Give this one a try later!
75 degrees F 90 degrees F
100 degrees F 60 degrees F
Don't know?
6 of 197
Term
Rotating Biological Contactors:
Approx. how much surface area of a rotating biological contactor is
immerses in the wastewater?
Give this one a try later!
CERTIFICATION STUDY GUIDE-GRADE
2 | 197 QUESTIONS | WITH ACCURATE
SOLUTIONS!!
, flotation thickening scroll centrifuge
Don't know?
2 of 197
Term
Rocks/Screens/Comminutors & Grit Removal:
Proper flow velocity through a grit channel is indicated when the grit
being removed contains
a. no organics
b. a little organic material
c. about half the volume as the grit being removed
d. about the same volume as the grit being removed
Give this one a try later!
solids concentration chlorine oxidation
remove sludge faster a little organic material
Don't know?
3 of 197
,Term
Wastewater Solids Processing:
Name the solids treatment method that has a solids buildup which
forms a blanket on the bottom and forces the water out due to
compression?
Give this one a try later!
flotation thickening gravity thickening
pasteurization lime stabilization
Don't know?
4 of 197
Term
Wastewater Treatment Facilities:
What should the flow velocity be through a grit channel
Give this one a try later!
0.5 ft/s 3.0 ft/s
1.0 ft/s 2.0 ft/s
, Don't know?
5 of 197
Term
Sedimentation and Flotation:
What is the optimum temperature for digester substances?
Give this one a try later!
75 degrees F 90 degrees F
100 degrees F 60 degrees F
Don't know?
6 of 197
Term
Rotating Biological Contactors:
Approx. how much surface area of a rotating biological contactor is
immerses in the wastewater?
Give this one a try later!
