FLORIDA WASTEWATER COMPREHENSIVE EXAMS
2025/2026 QUESTIONS WITH ANSWERS RATED A+
✔✔The chlorine residual is falling, and inspection of the 150LB cylinder and chlorine
feed equipment shows ice forming on the chlorine regulator and feed lines. The BEST
method to fix the falling chlorine residual is to: - ✔✔Place a second chlorine cylinder
online
✔✔The ash content in lab procedures is the same as? - ✔✔Inorganic solids
✔✔Denitrification will cause what? - ✔✔Rising sludge
✔✔If a 220 volt, 3 phase motor is running backwards, what should you do? - ✔✔Switch
the two leads
✔✔Coliform count fails to meet standards. Your chlorine supply is not the problem.
What is? - ✔✔Short circuiting and low contact time
✔✔What type of material should be used for transporting samples? - ✔✔Polyethylene
✔✔How does temperature effect disinfection? - ✔✔Higher the temp, the better the
disinfection
✔✔The advantage of an anaerobic digester over an aerobic digester is? -
✔✔Decreased power consumption
✔✔How long should you wait after you make a process change before making another
change? - ✔✔1 week
✔✔The settleometer settles fairly slowly. You have shiny dark foam of the surface of the
aerator. What is the problem? - ✔✔MCRT too high
✔✔The removal of nitrogen and phosphorus are? - ✔✔Advanced secondary treatment
✔✔What would cause a pump to fail to discharge? - ✔✔Suction lift too high
✔✔Chlorine is not coming out. Another cylinder is hooked up with the same problem.
What is the problem? - ✔✔Manifold line is clogged
✔✔How would you measure the amount of load being applied from the digester to the
head works? - ✔✔Total solids test
, ✔✔Why is a vacuum/pressure relief valve used on anaerobic digesters? - ✔✔Prevent
negative and positive pressure
✔✔What would cause the most damage to a centrifugal pump? - ✔✔Cavitation
✔✔The rock in trickling filters is placed? - ✔✔On system tile under drains
✔✔You have an RBC unit with the following parameters:
Q = 1.4MGD
Sol. BOD = 100mg/L
Surface Area = 500,000 s/f
What is the Organic loading in Lbs per 1,000 cu/ft? - ✔✔2.3 Lbs
✔✔What is the disadvantage of a hypochlorinator? - ✔✔Increases the pH and
decreases the disinfection
✔✔What chemical would be used on a sample to be used for TSS test? - ✔✔Nothing
✔✔What TSS test is most critical for plant operation - ✔✔TSS in air bay
✔✔What is a quick test to check sludge condition - ✔✔Settleometer
✔✔What is the funnel called that is used along with the vacuum apparatus when doing
solids testing? - ✔✔Büchner funnel
✔✔What would be most harmful to the population of microorganisms? - ✔✔High
toxicity, Strong acids, Strong bases
✔✔What can happen if more than 40Lbs of chlorine is withdrawn from a 150Lb tank in a
24hr period? - ✔✔Freezing of the lines
✔✔What are the two main gasses produced by an anaerobic digester? - ✔✔Methane
and CO2
✔✔When working in a man hole, what would be the biggest danger? - ✔✔Asphyxiation
✔✔In a pond, what will happen to the pH during the day time? - ✔✔Decrease
✔✔Cathodic protection is used for what purpose? - ✔✔The prevention of corrosion to
metals
2025/2026 QUESTIONS WITH ANSWERS RATED A+
✔✔The chlorine residual is falling, and inspection of the 150LB cylinder and chlorine
feed equipment shows ice forming on the chlorine regulator and feed lines. The BEST
method to fix the falling chlorine residual is to: - ✔✔Place a second chlorine cylinder
online
✔✔The ash content in lab procedures is the same as? - ✔✔Inorganic solids
✔✔Denitrification will cause what? - ✔✔Rising sludge
✔✔If a 220 volt, 3 phase motor is running backwards, what should you do? - ✔✔Switch
the two leads
✔✔Coliform count fails to meet standards. Your chlorine supply is not the problem.
What is? - ✔✔Short circuiting and low contact time
✔✔What type of material should be used for transporting samples? - ✔✔Polyethylene
✔✔How does temperature effect disinfection? - ✔✔Higher the temp, the better the
disinfection
✔✔The advantage of an anaerobic digester over an aerobic digester is? -
✔✔Decreased power consumption
✔✔How long should you wait after you make a process change before making another
change? - ✔✔1 week
✔✔The settleometer settles fairly slowly. You have shiny dark foam of the surface of the
aerator. What is the problem? - ✔✔MCRT too high
✔✔The removal of nitrogen and phosphorus are? - ✔✔Advanced secondary treatment
✔✔What would cause a pump to fail to discharge? - ✔✔Suction lift too high
✔✔Chlorine is not coming out. Another cylinder is hooked up with the same problem.
What is the problem? - ✔✔Manifold line is clogged
✔✔How would you measure the amount of load being applied from the digester to the
head works? - ✔✔Total solids test
, ✔✔Why is a vacuum/pressure relief valve used on anaerobic digesters? - ✔✔Prevent
negative and positive pressure
✔✔What would cause the most damage to a centrifugal pump? - ✔✔Cavitation
✔✔The rock in trickling filters is placed? - ✔✔On system tile under drains
✔✔You have an RBC unit with the following parameters:
Q = 1.4MGD
Sol. BOD = 100mg/L
Surface Area = 500,000 s/f
What is the Organic loading in Lbs per 1,000 cu/ft? - ✔✔2.3 Lbs
✔✔What is the disadvantage of a hypochlorinator? - ✔✔Increases the pH and
decreases the disinfection
✔✔What chemical would be used on a sample to be used for TSS test? - ✔✔Nothing
✔✔What TSS test is most critical for plant operation - ✔✔TSS in air bay
✔✔What is a quick test to check sludge condition - ✔✔Settleometer
✔✔What is the funnel called that is used along with the vacuum apparatus when doing
solids testing? - ✔✔Büchner funnel
✔✔What would be most harmful to the population of microorganisms? - ✔✔High
toxicity, Strong acids, Strong bases
✔✔What can happen if more than 40Lbs of chlorine is withdrawn from a 150Lb tank in a
24hr period? - ✔✔Freezing of the lines
✔✔What are the two main gasses produced by an anaerobic digester? - ✔✔Methane
and CO2
✔✔When working in a man hole, what would be the biggest danger? - ✔✔Asphyxiation
✔✔In a pond, what will happen to the pH during the day time? - ✔✔Decrease
✔✔Cathodic protection is used for what purpose? - ✔✔The prevention of corrosion to
metals
