Lagoon Systems Exam Questions with Correct Answers Latest Update 2026/2027
What is a common cause of slug loading in a lagoon? - Answers Dumping by septage hauling
trucks.
What depth of sludge on the bottom of a lagoon indicates that the lagoon should be cleaned? -
Answers 1 foot.
Which gas is used and produced by algae, causing variations in a lagoon's pH? - Answers
Carbon dioxide.
What information do operators need to know to calculate the detention time of a lagoon? -
Answers Volume and flow rate.
What provides enough oxygen to sufficiently aerate most lagoons for treatment processes to
work? - Answers Biological growth.
What information do operators need to know to calculate the organic loading rate of a lagoon? -
Answers Flow rate, surface area, and BOD concentration.
What pH level will keep lagoons from generating odors? - Answers Above 8.5.
How often should lagoon DO level, pH, and temperature be tested? - Answers Weekly.
What are the safety concerns when working on a plastic liner? - Answers Slips and falls.
When is the pH at its highest in a facultative lagoon? - Answers Daytime.
How long does it take for 90 percent of suspended solids to settle in a typical lagoon system? -
Answers 3 days.
What is used to remove coarse material from lagoon influent? - Answers Screens.
What color indicates unhealthy algae population in a lagoon? - Answers Gray.
Why might the addition of nitrate-containing chemicals for odor control in a lagoon not be
acceptable? - Answers Nitrogen restrictions in lagoon effluent.
What BOD removal rate can a facultative lagoon with a 60-day detention time achieve? -
Answers 70-80%.
What is the process of converting sunlight into energy called? - Answers Photosynthesis.
What are the containment structures of a lagoon system called? - Answers Levees.
Which solution is proven to eliminate algae in final lagoon effluent? - Answers Plastic sheet and
floating covers.
What is a common cause of slug loading in a lagoon? - Answers Dumping by septage hauling
trucks.
What depth of sludge on the bottom of a lagoon indicates that the lagoon should be cleaned? -
Answers 1 foot.
Which gas is used and produced by algae, causing variations in a lagoon's pH? - Answers
Carbon dioxide.
What information do operators need to know to calculate the detention time of a lagoon? -
Answers Volume and flow rate.
What provides enough oxygen to sufficiently aerate most lagoons for treatment processes to
work? - Answers Biological growth.
What information do operators need to know to calculate the organic loading rate of a lagoon? -
Answers Flow rate, surface area, and BOD concentration.
What pH level will keep lagoons from generating odors? - Answers Above 8.5.
How often should lagoon DO level, pH, and temperature be tested? - Answers Weekly.
What are the safety concerns when working on a plastic liner? - Answers Slips and falls.
When is the pH at its highest in a facultative lagoon? - Answers Daytime.
How long does it take for 90 percent of suspended solids to settle in a typical lagoon system? -
Answers 3 days.
What is used to remove coarse material from lagoon influent? - Answers Screens.
What color indicates unhealthy algae population in a lagoon? - Answers Gray.
Why might the addition of nitrate-containing chemicals for odor control in a lagoon not be
acceptable? - Answers Nitrogen restrictions in lagoon effluent.
What BOD removal rate can a facultative lagoon with a 60-day detention time achieve? -
Answers 70-80%.
What is the process of converting sunlight into energy called? - Answers Photosynthesis.
What are the containment structures of a lagoon system called? - Answers Levees.
Which solution is proven to eliminate algae in final lagoon effluent? - Answers Plastic sheet and
floating covers.
