Wastewater Operator Certification
Exam 2025 | Complete Study Guide
with Verified Questions & Answers
polychaetes rotifers
, amoebas protozoa
Don't know?
2 of 190
Term
Secondary Treatment:
Rotating biological contactors have all the following advantages except:
a. high sludge production
b. they can handle a large range of flows
c. power requirements are low
d. low operating costs, as they are east to run
Give this one a go later!
solids concentration trisodium phosphate
high sludge production hypochlorous acid
Don't know?
3 of 190
Term
,Sludge Digestion & Solids Handling:
what would be the best solution if the volatile-acid-to-alkalinity ratio increased to
0.3 in a digester due to pumping thin sludge?
Give this one a go later!
remove sludge faster reduce mixing time
thicken the raw sludge add treatment chemicals
Don't know?
4 of 190
Term
Activated Sludge:
Most algae are in the __ kingdom
Give this one a go later!
Animalia Kingdom Fungi Kingdom
Protista Kingdom Plantae Kingdom
, Don't know?
5 of 190
Term
Sludge Digestion & Solids Handling:
Operators should, as a rule, never change the temperature in an anaerobic digester
by more than___degrees F/day
Give this one a go later!
1 degree F/day 5 degrees F/day
0.5 degrees F/day 10 degrees F/day
Don't know?
6 of 190
Term
Wastewater Solids Processing:
What is the solids treatment method that aerated the recycles water from the unit
under pressure?
Exam 2025 | Complete Study Guide
with Verified Questions & Answers
polychaetes rotifers
, amoebas protozoa
Don't know?
2 of 190
Term
Secondary Treatment:
Rotating biological contactors have all the following advantages except:
a. high sludge production
b. they can handle a large range of flows
c. power requirements are low
d. low operating costs, as they are east to run
Give this one a go later!
solids concentration trisodium phosphate
high sludge production hypochlorous acid
Don't know?
3 of 190
Term
,Sludge Digestion & Solids Handling:
what would be the best solution if the volatile-acid-to-alkalinity ratio increased to
0.3 in a digester due to pumping thin sludge?
Give this one a go later!
remove sludge faster reduce mixing time
thicken the raw sludge add treatment chemicals
Don't know?
4 of 190
Term
Activated Sludge:
Most algae are in the __ kingdom
Give this one a go later!
Animalia Kingdom Fungi Kingdom
Protista Kingdom Plantae Kingdom
, Don't know?
5 of 190
Term
Sludge Digestion & Solids Handling:
Operators should, as a rule, never change the temperature in an anaerobic digester
by more than___degrees F/day
Give this one a go later!
1 degree F/day 5 degrees F/day
0.5 degrees F/day 10 degrees F/day
Don't know?
6 of 190
Term
Wastewater Solids Processing:
What is the solids treatment method that aerated the recycles water from the unit
under pressure?
