Question 1
In the four-stage Bardenpho process, ammonia from the influent is converted to nitrate in
which area?
a. anoxic zone b. aeration basin c. anaerobic zone d. aerobic zone
CORRECT ANSWER
b. aeration basin
Question 2
. What is the theoretical amount of oxygen in milligrams required to convert 1 mg of
ammonia nitrogen to nitrate nitrogen?
a. 2.5 mg b. 3.3 mg c. 4.6 mg d. 7.1 mg
CORRECT ANSWER
c. 4.6 mg
Question 3
What is the operating guideline in the four-stage Bardenpho process for the mean cell
residence time?
a. 15 to 20 days b. 20 to 25 days c. 20 to 30 days d. 20 to 40 days
CORRECT ANSWER
1
@THE STUDY VAULT
, c. 20 to 30 days
Question 4
The optimum pH range in the enhanced chemical nutrient control reactions for
phosphorus removed by Fe3+ addition is
a. 4.0 to 6.0 b. 4.5 to 6.0 c. 4.5 to 6.5 d. 5.0 to 6.5
CORRECT ANSWER
a. 4.0 to 6.0
Question 5
What is the desired DO level for an anaerobic selector?
a. 0.05 mg/L b. 0.10 mg/L c. 0.15 mg/L d. 0.20 mg/L
CORRECT ANSWER
b. 0.10 mg/L
Question 6
Which one of the following types of foam is the most persistent and most difficult to
control?
a. solids from the dewatering process b. filamentous or Nocardia organisms c. polymer
overdosing d. nutrient deficiencies
CORRECT ANSWER
b. filamentous or Nocardia organisms
2
@THE STUDY VAULT
,Question 7
In the reaction of hydrogen sulfide with chlorine to form sulfuric acid, it takes one part
hydrogen sulfide for every _______ parts of chlorine.
a. 2.5 b. 4.5 c. 6.5 d. 8.5
CORRECT ANSWER
d. 8.5
Question 8
In the enhanced-biological-nutrient-control activated sludge system for the process control
of phosphorus removal, what are the primary controlling variables for the desired
microbial population?
a. volatile fatty acids b. soluble BOD5 and phosphate c. pH and alkalinity d. oxidized nitrogen
and DO
CORRECT ANSWER
d. oxidized nitrogen and DO
Question 9
. Dichloramine will be present in wastewaters at pH values below what?
a. 5.5 b. 5.0 c. 4.7 d. 4.3
CORRECT ANSWER
a. 5.5
3
@THE STUDY VAULT
, Question 10
What is the recommended withdrawal of chlorine from a 100- or 150-lb cylinder for each
degree Fahrenheit ambient temperature such that freezing does not occur?
a. 1 lb b. 2 lb c. 3 lb d. 4 lb
CORRECT ANSWER
a. 1 lb
Question 11
What chlorine emergency repair kit is used to stop leaks only at the valves of tank cars?
a. emergency repair kit A b. emergency repair kit B c. emergency repair kit C d. emergency
repair kit T
CORRECT ANSWER
c. emergency repair kit C
Question 12
If a liquid sulfonator was misting, what would most likely be the cause?
a. loss of water pressure b. wrong size injector valve c. dirty injector valve d. defective
evaporator
CORRECT ANSWER
d. defective evaporator
4
@THE STUDY VAULT
In the four-stage Bardenpho process, ammonia from the influent is converted to nitrate in
which area?
a. anoxic zone b. aeration basin c. anaerobic zone d. aerobic zone
CORRECT ANSWER
b. aeration basin
Question 2
. What is the theoretical amount of oxygen in milligrams required to convert 1 mg of
ammonia nitrogen to nitrate nitrogen?
a. 2.5 mg b. 3.3 mg c. 4.6 mg d. 7.1 mg
CORRECT ANSWER
c. 4.6 mg
Question 3
What is the operating guideline in the four-stage Bardenpho process for the mean cell
residence time?
a. 15 to 20 days b. 20 to 25 days c. 20 to 30 days d. 20 to 40 days
CORRECT ANSWER
1
@THE STUDY VAULT
, c. 20 to 30 days
Question 4
The optimum pH range in the enhanced chemical nutrient control reactions for
phosphorus removed by Fe3+ addition is
a. 4.0 to 6.0 b. 4.5 to 6.0 c. 4.5 to 6.5 d. 5.0 to 6.5
CORRECT ANSWER
a. 4.0 to 6.0
Question 5
What is the desired DO level for an anaerobic selector?
a. 0.05 mg/L b. 0.10 mg/L c. 0.15 mg/L d. 0.20 mg/L
CORRECT ANSWER
b. 0.10 mg/L
Question 6
Which one of the following types of foam is the most persistent and most difficult to
control?
a. solids from the dewatering process b. filamentous or Nocardia organisms c. polymer
overdosing d. nutrient deficiencies
CORRECT ANSWER
b. filamentous or Nocardia organisms
2
@THE STUDY VAULT
,Question 7
In the reaction of hydrogen sulfide with chlorine to form sulfuric acid, it takes one part
hydrogen sulfide for every _______ parts of chlorine.
a. 2.5 b. 4.5 c. 6.5 d. 8.5
CORRECT ANSWER
d. 8.5
Question 8
In the enhanced-biological-nutrient-control activated sludge system for the process control
of phosphorus removal, what are the primary controlling variables for the desired
microbial population?
a. volatile fatty acids b. soluble BOD5 and phosphate c. pH and alkalinity d. oxidized nitrogen
and DO
CORRECT ANSWER
d. oxidized nitrogen and DO
Question 9
. Dichloramine will be present in wastewaters at pH values below what?
a. 5.5 b. 5.0 c. 4.7 d. 4.3
CORRECT ANSWER
a. 5.5
3
@THE STUDY VAULT
, Question 10
What is the recommended withdrawal of chlorine from a 100- or 150-lb cylinder for each
degree Fahrenheit ambient temperature such that freezing does not occur?
a. 1 lb b. 2 lb c. 3 lb d. 4 lb
CORRECT ANSWER
a. 1 lb
Question 11
What chlorine emergency repair kit is used to stop leaks only at the valves of tank cars?
a. emergency repair kit A b. emergency repair kit B c. emergency repair kit C d. emergency
repair kit T
CORRECT ANSWER
c. emergency repair kit C
Question 12
If a liquid sulfonator was misting, what would most likely be the cause?
a. loss of water pressure b. wrong size injector valve c. dirty injector valve d. defective
evaporator
CORRECT ANSWER
d. defective evaporator
4
@THE STUDY VAULT
