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Wastewater Operator Exam Prep AZDEQ Grade 1 & 2
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1. What is the most common reason for a wastewater storm events
to contain intermittent large amounts of sand, gravel,
and grit?
2. Combined wastewater is defined as: sanitary wastewater and
storm water runoff
3. In general , the solids content in wastewater is about: 0.1%
4. In general, what is the percentage of suspended 30%
solids in the total amount of solids?
5. Generally, the percentage of dissolved solids in the 70%
amount of total solids is about:
6. Which type of organisms would most probably be as- amoebas
sociated with poor treatment or young biomass?
7. Which type of organisms would most probably be as- stalked ciliates
sociated with very clear plant effluent, low biochem-
ical oxygen demand (BOD), and low amounts of sus-
pended solids?
8. Aerobic bacteria will reproduce and live in an environ- oxygen
ment that contains only:
9. Anaerobic bacteria will reproduce and live only in an free or dissolved oxygen
environment that completely lacks: (DO)
10. The biochemical oxygen demand (BOD) test usually 5 days
has a specific time of:
11. An Imhoff cone measures: a volume of settleable
solids
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Wastewater Operator Exam Prep AZDEQ Grade 1 & 2https://www.stuvia.com/user/docstudent96!##################
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Wastewater Operator Exam Prep AZDEQ Grade 1 & 2
Study online at https://quizlet.com/_eifhrl
12. Septic conditions are caused by: anaerobic bacteria
13. Scum is usually removed in the _________ treatment primary
stage.
14. When domestic wastewater enters natural waters, aerobic bacteria
what species deplete most of the oxygen?
15. Once the oxygen is depleted in a natural body of water, anaerobic bacteria
which organisms take over?
16. The major gas produced by anaerobic decomposition methane
is:
17. When organic wastes are discharged to receiving wa- bacteria
ters, oxygen is depleted by:
18. Coliform bacteria are: indicators
19. Which indicates a good quality domestic activated brown color and musty
sludge? odor
20. Common settling times in wastewater treatment 2 to 4 hours
plants range from:
21. Which gas is produced in anaerobic digesters and can methane
be used as a fuel?
22. The rock in most trickling filters is placed: on a system of tile under-
drains
23. What is the purpose of heating and mixing a primary to increase the digestion
anaerobic digester? rate
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Wastewater Operator Exam Prep AZDEQ Grade 1 & 2https://www.stuvia.com/user/docstudent96!##################
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Wastewater Operator Exam Prep AZDEQ Grade 1 & 2
Study online at https://quizlet.com/_eifhrl
24. The following device is used to measure the flow of parshall flume
wastewater:
25. What does healthy activated sludge smell like? earthy
26. What is a biomass? a mass of organic mater-
ial consisting of living or-
ganisms that feed on the
wastes of sewage
27. What could cause a sudden drop in pH of the influent? acidic chemical in the in-
fluent
28. Which of the following is typically treated by biological dissolved and non-sett-
processes? lable organic material
29. What impact does temperature have on the reaction reaction rate doubles with
rate of microorganism in wastewater? every 18 degree Fahren-
heit increase in tempera-
ture until higher tempera-
ture inhibits biological ac-
tivity
30. What is true during the colder winter months? modify operations to in-
crease solids under aera-
tion to provide more mi-
croorganisms to treat the
BOD
31. What are commonly used to control chlorine feed rate flow and chlorine residual
for disinfection?
32. What is used to control filamentous organisms? chlorine
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Wastewater Operator Exam Prep AZDEQ Grade 1 & 2https://www.stuvia.com/user/docstudent96!##################
https://www.stuvia.com/user/docstudent96~~~~~~~~~~~~~!!!!!!!!!!!!!!!!!!!!!!!@~
Wastewater Operator Exam Prep AZDEQ Grade 1 & 2
Study online at https://quizlet.com/_eifhrl
1. What is the most common reason for a wastewater storm events
to contain intermittent large amounts of sand, gravel,
and grit?
2. Combined wastewater is defined as: sanitary wastewater and
storm water runoff
3. In general , the solids content in wastewater is about: 0.1%
4. In general, what is the percentage of suspended 30%
solids in the total amount of solids?
5. Generally, the percentage of dissolved solids in the 70%
amount of total solids is about:
6. Which type of organisms would most probably be as- amoebas
sociated with poor treatment or young biomass?
7. Which type of organisms would most probably be as- stalked ciliates
sociated with very clear plant effluent, low biochem-
ical oxygen demand (BOD), and low amounts of sus-
pended solids?
8. Aerobic bacteria will reproduce and live in an environ- oxygen
ment that contains only:
9. Anaerobic bacteria will reproduce and live only in an free or dissolved oxygen
environment that completely lacks: (DO)
10. The biochemical oxygen demand (BOD) test usually 5 days
has a specific time of:
11. An Imhoff cone measures: a volume of settleable
solids
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Wastewater Operator Exam Prep AZDEQ Grade 1 & 2https://www.stuvia.com/user/docstudent96!##################
https://www.stuvia.com/user/docstudent96~~~~~~~~~~~~~!!!!!!!!!!!!!!!!!!!!!!!@~
Wastewater Operator Exam Prep AZDEQ Grade 1 & 2
Study online at https://quizlet.com/_eifhrl
12. Septic conditions are caused by: anaerobic bacteria
13. Scum is usually removed in the _________ treatment primary
stage.
14. When domestic wastewater enters natural waters, aerobic bacteria
what species deplete most of the oxygen?
15. Once the oxygen is depleted in a natural body of water, anaerobic bacteria
which organisms take over?
16. The major gas produced by anaerobic decomposition methane
is:
17. When organic wastes are discharged to receiving wa- bacteria
ters, oxygen is depleted by:
18. Coliform bacteria are: indicators
19. Which indicates a good quality domestic activated brown color and musty
sludge? odor
20. Common settling times in wastewater treatment 2 to 4 hours
plants range from:
21. Which gas is produced in anaerobic digesters and can methane
be used as a fuel?
22. The rock in most trickling filters is placed: on a system of tile under-
drains
23. What is the purpose of heating and mixing a primary to increase the digestion
anaerobic digester? rate
4/3/2026, 2:44:08 PMhttps://www.stuvia.com/user/docstudent96
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, https://www.stuvia.com/user/docstudent96~~!@#############~
Wastewater Operator Exam Prep AZDEQ Grade 1 & 2https://www.stuvia.com/user/docstudent96!##################
https://www.stuvia.com/user/docstudent96~~~~~~~~~~~~~!!!!!!!!!!!!!!!!!!!!!!!@~
Wastewater Operator Exam Prep AZDEQ Grade 1 & 2
Study online at https://quizlet.com/_eifhrl
24. The following device is used to measure the flow of parshall flume
wastewater:
25. What does healthy activated sludge smell like? earthy
26. What is a biomass? a mass of organic mater-
ial consisting of living or-
ganisms that feed on the
wastes of sewage
27. What could cause a sudden drop in pH of the influent? acidic chemical in the in-
fluent
28. Which of the following is typically treated by biological dissolved and non-sett-
processes? lable organic material
29. What impact does temperature have on the reaction reaction rate doubles with
rate of microorganism in wastewater? every 18 degree Fahren-
heit increase in tempera-
ture until higher tempera-
ture inhibits biological ac-
tivity
30. What is true during the colder winter months? modify operations to in-
crease solids under aera-
tion to provide more mi-
croorganisms to treat the
BOD
31. What are commonly used to control chlorine feed rate flow and chlorine residual
for disinfection?
32. What is used to control filamentous organisms? chlorine
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